/* ===========================================
   อัยโนะ (Aino) - Gemini-like Design
   =========================================== */

/* === RESET === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Hide tools button when not logged in (fixes blur issue on mobile) */
/* This will be overridden by JavaScript when user is authenticated */
#toolsBtn {
    display: none;
}

/* Reset all heading elements */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    padding: 0;
    border: none;
    border-bottom: none;
    border-top: none;
    text-decoration: none;
    outline: none;
    box-shadow: none;
}

:root {
    /* === Color System - KidAi Theme === */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-500: #306E8C; /* KidAi Blue */
    --primary-600: #24556e; /* KidAi Dark Blue */
    --secondary-500: #8CBF56; /* KidAi Green */
    --secondary-600: #76a346; /* KidAi Dark Green */

    --pink-50: #fffbeb;
    --pink-100: #fef3c7;
    --pink-500: #f59e0b; /* KidAi Amber/Yellow (was Pink) */
    --pink-600: #d97706;
    
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* === Light Theme (GPT-Style) === */
    --bg-base: #ffffff;
    --bg-elevated: #f7f7f8;
    --bg-overlay: rgba(255, 255, 255, 0.95);
    --bg-sidebar: #f7f7f8;
    --bg-hover: #ececf1;
    
    --text-primary: #353740;
    --text-secondary: #6e6e80;
    --text-tertiary: #acacbe;
    
    --border-subtle: #e5e5e6;
    --border-light: #e5e5e6;
    --border-medium: #d1d5db;
    
    /* Brand Colors - GPT-Style Professional Palette */
    --brand-primary: #10a37f;
    --brand-secondary: #0d8f6e;
    --brand-gradient: linear-gradient(135deg, #10a37f 0%, #0d8f6e 100%);
    --brand-gradient-subtle: linear-gradient(135deg, rgba(16, 163, 127, 0.1) 0%, rgba(13, 143, 110, 0.1) 100%);
    
    --accent: var(--brand-primary);
    --accent-hover: var(--brand-secondary);
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 1px 2px -1px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-xs: 0.25rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions - Professional smooth animations */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 300ms cubic-bezier(0.25, 0.46, 0.45, 0.94); /* Smooth ease-in-out */
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55); /* Subtle bounce */
    
    /* Typography - GPT/Gemini Style */
    /* Primary: Inter (GPT style) with Google Sans (Gemini style) fallback */
    --font-body: 'Inter', 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Google Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    /* Thai font fallback for Thai text */
    --font-thai: 'Sarabun', 'Prompt', var(--font-body);
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
}

[data-theme="dark"] {
    --bg-base: #343541;
    --bg-elevated: #40414f;
    --bg-overlay: rgba(52, 53, 65, 0.95);
    --bg-sidebar: #202123;
    --bg-hover: #565869;
    
    --text-primary: #ececf1;
    --text-secondary: #c5c5d2;
    --text-tertiary: #8e8ea0;
    
    --border-subtle: #565869;
    --border-light: #565869;
    --border-medium: #6e6e80;
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7), 0 8px 10px -6px rgba(0, 0, 0, 0.7);
}

/* === KidAI Code Green Theme (Light) === */
[data-theme="light-green"] {
    --bg-base: #ffffff;
    --bg-elevated: #f0fdf4;
    --bg-overlay: rgba(240, 253, 244, 0.8);
    --bg-sidebar: #f0fdf4;
    --bg-hover: #dcfce7;
    
    --text-primary: #14532d;
    --text-secondary: #166534;
    --text-tertiary: #15803d;
    
    --border-subtle: #dcfce7;
    --border-light: #bbf7d0;
    --border-medium: #86efac;
    
    /* Green Brand Colors */
    --brand-primary: #22c55e;
    --brand-secondary: #16a34a;
    --brand-gradient: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    --brand-gradient-subtle: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(22, 163, 74, 0.1) 100%);
    
    --accent: var(--brand-primary);
    --accent-hover: var(--brand-secondary);
    
    --shadow-xs: 0 1px 2px 0 rgba(34, 197, 94, 0.1);
    --shadow-sm: 0 1px 3px 0 rgba(34, 197, 94, 0.15), 0 1px 2px -1px rgba(34, 197, 94, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(34, 197, 94, 0.2), 0 2px 4px -2px rgba(34, 197, 94, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(34, 197, 94, 0.25), 0 4px 6px -4px rgba(34, 197, 94, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(34, 197, 94, 0.3), 0 8px 10px -6px rgba(34, 197, 94, 0.25);
}

/* === KidAI Code Green Theme (Dark) === */
[data-theme="dark-green"] {
    --bg-base: #0f172a;
    --bg-elevated: #1e293b;
    --bg-overlay: rgba(15, 23, 42, 0.8);
    --bg-sidebar: #1e293b;
    --bg-hover: #334155;
    
    --text-primary: #f0fdf4;
    --text-secondary: #bbf7d0;
    --text-tertiary: #86efac;
    
    --border-subtle: #1e293b;
    --border-light: #334155;
    --border-medium: #475569;
    
    /* Green Brand Colors */
    --brand-primary: #22c55e;
    --brand-secondary: #16a34a;
    --brand-gradient: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    --brand-gradient-subtle: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(22, 163, 74, 0.2) 100%);
    
    --accent: var(--brand-primary);
    --accent-hover: var(--brand-secondary);
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(34, 197, 94, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(34, 197, 94, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.7);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    overflow-y: hidden;
    width: 100%;
    max-width: 100vw;
    height: 100%;
    /* Support for safe areas (notch) */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-base);
    overflow: hidden;
    height: 100vh;
    max-height: 100vh;
    transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1), 
                color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    touch-action: pan-x pan-y;
    overscroll-behavior-y: contain;
    -webkit-tap-highlight-color: transparent;
    /* GPT/Gemini typography enhancements */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    letter-spacing: -0.011em; /* Tighter letter spacing like GPT/Gemini */
    font-feature-settings: 'kern' 1, 'liga' 1;
    width: 100%;
    max-width: 100vw;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Support for safe areas */
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
}

/* === APP WRAPPER === */
.app-wrapper {
    display: flex;
    height: 100vh;
    height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    position: relative;
    width: 100%;
    max-width: 100vw;
    overflow: hidden;
    box-sizing: border-box;
    animation: fadeIn 0.5s ease-out;
    will-change: opacity;
    transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-wrapper.sidebar-collapsed .header-left {
    margin-left: 0;
}

/* === SIDEBAR (GPT-Style) === */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-smooth), 
                border-color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                background 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 100;
    overflow: hidden;
    /* Support for safe areas */
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
    height: 100vh;
    height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    box-sizing: border-box;
    animation: slideInLeft 0.4s ease-out;
}

[data-theme="dark"] .sidebar {
    background: linear-gradient(180deg, var(--bg-sidebar) 0%, rgba(26, 26, 26, 0.5) 50%, var(--bg-elevated) 100%);
}

.sidebar.collapsed {
    transform: translateX(-100%);
    width: 0;
    min-width: 0;
    border-right: none;
    overflow: hidden;
}

.sidebar-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-top {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3);
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-btn {
    flex: 1;
    padding: var(--space-2);
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.sidebar-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--brand-gradient-subtle);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
    z-index: 0;
}

.sidebar-btn:hover::before {
    width: 200px;
    height: 200px;
}

.sidebar-btn:hover {
    background: var(--bg-hover);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.sidebar-btn svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
}

.sidebar-btn:hover svg {
    transform: scale(1.1);
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-subtle);
}

.btn-new {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-base);
    touch-action: manipulation;
    box-shadow: 0 2px 4px rgba(16, 163, 127, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-new::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-new:hover::before {
    left: 100%;
}

.btn-new:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(16, 163, 127, 0.3);
}

.btn-new:active {
    transform: translateY(0) scale(0.98);
}

.btn-new svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
}

.btn-new:hover svg {
    transform: rotate(90deg) scale(1.1);
}

.btn-new svg {
    color: white;
}

.btn-new svg {
    width: 16px;
    height: 16px;
}

.btn-new-secondary {
    background: linear-gradient(135deg, var(--gray-600), var(--gray-700));
    box-shadow: 0 4px 12px rgba(107, 114, 128, 0.3);
}

.btn-new-secondary:hover {
    box-shadow: 0 6px 16px rgba(107, 114, 128, 0.4);
}

/* Hide project button in aichatbot page */
#newProjectBtn {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
    pointer-events: none !important;
    width: 0 !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden !important;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.sidebar-section {
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-3);
    padding: var(--space-2) var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--brand-primary);
}

.section-title::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--brand-primary);
    border-radius: var(--radius-full);
    box-shadow: 0 0 4px rgba(48, 110, 140, 0.5);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.history-item {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    touch-action: manipulation;
}

.history-item {
    transition: all var(--transition-smooth);
    position: relative;
}

.history-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: var(--brand-gradient);
    transition: width var(--transition-smooth);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.history-item:hover::before {
    width: 3px;
}

.history-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-left: 3px solid var(--brand-primary);
    padding-left: calc(var(--space-4) - 3px);
    transform: translateX(2px);
}

.history-item.active {
    background: linear-gradient(90deg, var(--brand-gradient-subtle), transparent);
    color: var(--text-primary);
    font-weight: 600;
    border-left: 3px solid var(--brand-primary);
    padding-left: calc(var(--space-4) - 3px);
    position: relative;
}

.history-item.active::after {
    content: '';
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--brand-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

/* Chat History Item - Button Style */
.chat-history-item {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    text-align: left;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
}

.chat-history-item:focus {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
}

.chat-history-item:focus:not(:focus-visible) {
    outline: none;
}

.chat-history-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: var(--brand-gradient);
    transition: width var(--transition-smooth);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.chat-history-item:hover {
    background: var(--bg-hover);
    border-color: var(--brand-primary);
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.15);
}

.chat-history-item:hover::before {
    width: 3px;
}

.chat-history-item:active {
    transform: translateX(1px) scale(0.98);
    box-shadow: 0 1px 4px rgba(48, 110, 140, 0.2);
}

.chat-history-item.active {
    background: var(--brand-gradient-subtle);
    border-color: var(--brand-primary);
    border-left-width: 3px;
    padding-left: calc(var(--space-4) - 2px);
}

.chat-history-item.active::after {
    content: '';
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--brand-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.chat-history-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}

.chat-history-preview {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.chat-history-time {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-1);
}

.empty-history {
    padding: var(--space-8);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

/* === PROJECT ITEMS === */
.project-item {
    width: 100%;
    padding: var(--space-4);
    margin-bottom: var(--space-2);
    border-radius: var(--radius-lg);
    cursor: pointer;
    background: var(--bg-secondary);
    border: 2px solid var(--border-subtle);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    text-align: left;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.project-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: var(--brand-gradient);
    transition: width var(--transition-smooth);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.project-item:hover {
    background: var(--bg-hover);
    border-color: var(--brand-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.2);
}

.project-item:hover::before {
    width: 4px;
}

.project-item:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 6px rgba(48, 110, 140, 0.15);
}

.project-item:focus {
    outline: 2px solid var(--brand-primary);
    outline-offset: 2px;
}

.project-item:focus:not(:focus-visible) {
    outline: none;
}

.project-item.active {
    background: var(--brand-gradient-subtle);
    border-color: var(--brand-primary);
    border-left-width: 4px;
    padding-left: calc(var(--space-4) - 2px);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.25);
}

.project-item.active::after {
    content: '';
    position: absolute;
    right: var(--space-3);
    top: var(--space-3);
    width: 8px;
    height: 8px;
    background: var(--brand-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.project-item-content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    flex: 1;
    min-width: 0;
}

.project-item-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-gradient-subtle);
    border-radius: var(--radius-md);
    color: var(--brand-primary);
    transition: all var(--transition-smooth);
}

.project-item:hover .project-item-icon {
    background: var(--brand-gradient);
    color: white;
    transform: scale(1.1) rotate(5deg);
}

.project-item.active .project-item-icon {
    background: var(--brand-gradient);
    color: white;
}

.project-item-text {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.project-item-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}

.project-item-description {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.project-item-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

.project-item-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-smooth);
}

.project-item:hover .project-item-badge {
    background: var(--brand-gradient-subtle);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

.project-item.active .project-item-badge {
    background: var(--brand-primary);
    border-color: var(--brand-primary);
    color: white;
}

.project-item-delete {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-smooth);
    outline: none;
    opacity: 0;
}

.project-item:hover .project-item-delete {
    opacity: 1;
}

.project-item-delete:hover {
    background: var(--text-danger);
    border-color: var(--text-danger);
    color: white;
    transform: scale(1.1);
}

.project-item-delete:active {
    transform: scale(0.95);
}

.project-item-delete:focus {
    outline: 2px solid var(--text-danger);
    outline-offset: 2px;
}

.project-item-delete:focus:not(:focus-visible) {
    outline: none;
}

/* === PROJECT VIEW === */
.project-view {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    animation: fadeIn 0.3s ease-out;
}

.project-view-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid var(--border-subtle);
    flex-shrink: 0;
}

.project-view-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-gradient);
    border-radius: var(--radius-lg);
    color: white;
}

.project-view-info {
    flex: 1;
    min-width: 0;
}

.project-view-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-2) 0;
    line-height: 1.3;
}

.project-view-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.project-view-add-btn {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--brand-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-smooth);
    outline: none;
}

.project-view-add-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.3);
}

.project-view-add-btn:active {
    transform: translateY(0);
}

.project-chats-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
    padding-top: var(--space-4);
}

.project-chats-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
}

.project-chats-empty {
    grid-column: 1 / -1;
    padding: var(--space-8);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

/* Project Chat Response */
.project-chat-response {
    grid-column: 1 / -1;
    margin-bottom: var(--space-4);
    animation: fadeIn 0.3s ease-out;
}

.project-chat-response-item {
    margin-bottom: var(--space-3);
    animation: messageSlideIn 0.4s ease-out;
}

.project-chat-response-item.user {
    display: flex;
    justify-content: flex-end;
}

.project-chat-response-item.assistant {
    display: flex;
    justify-content: flex-start;
}

.project-chat-response-content {
    max-width: 80%;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.project-chat-response-item.user .project-chat-response-content {
    background: var(--brand-gradient);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.project-chat-response-item.assistant .project-chat-response-content {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    border-bottom-left-radius: var(--radius-sm);
}

.project-chat-response-text {
    font-size: var(--text-sm);
    line-height: 1.6;
    word-wrap: break-word;
}

.project-chat-response-text strong {
    font-weight: 600;
}

.project-chat-response-text em {
    font-style: italic;
}

.project-chat-response-text code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.project-chat-response-item.loading .project-chat-response-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    align-items: center;
    padding: var(--space-2) 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--brand-primary);
    border-radius: 50%;
    animation: typing 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-chat-item {
    width: 100%;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    cursor: pointer;
    background: var(--bg-secondary);
    border: 2px solid var(--border-subtle);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    text-align: left;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.project-chat-item:hover {
    background: var(--bg-hover);
    border-color: var(--brand-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.2);
}

.project-chat-item:active {
    transform: translateY(0) scale(0.98);
}

.project-chat-item.active {
    background: var(--brand-gradient-subtle);
    border-color: var(--brand-primary);
    border-left-width: 4px;
    padding-left: calc(var(--space-4) - 2px);
}

.project-chat-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.project-chat-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.project-chat-description {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.project-chat-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

.project-chat-time {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.project-chat-delete {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-smooth);
    outline: none;
    opacity: 0;
}

.project-chat-item:hover .project-chat-delete {
    opacity: 1;
}

.project-chat-delete:hover {
    background: var(--text-danger);
    border-color: var(--text-danger);
    color: white;
    transform: scale(1.1);
}

.project-chat-delete:active {
    transform: scale(0.95);
}

/* Project View Input */
.project-view-input {
    padding: var(--space-4);
    border-top: 2px solid var(--border-subtle);
    background: var(--bg-base);
    position: sticky;
    bottom: 0;
    z-index: 10;
}

.project-view-input .input-container {
    max-width: 100%;
}

.project-view-input .input-box {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--bg-secondary);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-2) var(--space-3);
    transition: all var(--transition-smooth);
}

.project-model-selector {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-3);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--brand-primary);
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.project-model-selector::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--brand-gradient-subtle);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.project-model-selector:hover::before {
    opacity: 1;
}

.project-model-selector:hover {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.2);
    transform: translateY(-1px);
}

.project-model-selector svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
    flex-shrink: 0;
}

.project-model-selector:hover svg {
    transform: rotate(180deg);
}

.project-model-selector span {
    position: relative;
    z-index: 1;
}

.project-view-input .input-box:focus-within {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(48, 110, 140, 0.1);
}

.project-view-input .message-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: var(--text-sm);
    outline: none;
    padding: 0;
}

.project-view-input .message-input::placeholder {
    color: var(--text-tertiary);
}

.project-view-input .send-btn {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-smooth);
    outline: none;
}

.project-view-input .send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.3);
}

.project-view-input .send-btn:active {
    transform: scale(0.95);
}

.project-view-input .send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border-subtle);
}

.footer-link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    touch-action: manipulation;
}

.footer-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.footer-link svg {
    width: 16px;
    height: 16px;
}

/* === MAIN === */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}


/* === HEADER === */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-8);
    background: var(--bg-base);
    border-bottom: none;
    z-index: 1000; /* Increased to ensure header is above background elements */
    position: relative;
    box-shadow: none;
    transition: padding var(--transition-smooth), box-shadow var(--transition-smooth);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-left: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-right, 0)));
    padding-top: max(var(--space-5), calc(var(--space-5) + env(safe-area-inset-top, 0)));
    overflow: hidden;
    animation: slideDown 0.4s ease-out;
}

/* When sidebar is collapsed, header moves to edge - flush left */
.app-wrapper.sidebar-collapsed .header {
    padding-left: 0;
}

.app-wrapper.sidebar-collapsed .header-left {
    margin-left: 0;
    padding-left: 0;
    gap: var(--space-3);
}

.app-wrapper.sidebar-collapsed .header-menu {
    margin-left: 0;
}

[data-theme="dark"] .header {
    box-shadow: none;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: gap var(--transition-smooth);
    animation: fadeIn 0.5s ease-out 0.1s both;
    position: relative;
    flex: 1;
    min-width: 0;
}

.header-menu {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    touch-action: manipulation;
    position: relative;
}

.header-menu::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-sm);
    background: var(--brand-gradient-subtle);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.header-menu:hover::before {
    opacity: 1;
}

.header-menu:hover {
    background: var(--bg-hover);
    color: var(--brand-primary);
    transform: scale(1.1);
}

.header-menu svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
}

.header-menu:hover svg {
    transform: rotate(90deg);
}

.header-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin: 0;
    padding: 0;
    line-height: 1.2;
    border: none !important;
    border-bottom: none !important;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    border-top: none !important;
    text-decoration: none !important;
    outline: none !important;
    box-shadow: none !important;
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: inline-block;
    max-width: 100%;
    transition: color var(--transition-smooth);
}

/* Removed gradientShift animation for cleaner GPT-style design */

.header-title::before,
.header-title::after {
    content: none !important;
    display: none !important;
    border: none !important;
    background: none !important;
}

/* Model Selector in Header (Mobile Only) */
.model-selector-header-mobile {
    display: none !important; /* Hidden by default, shown only on mobile when authenticated - controlled by JavaScript */
    padding: var(--space-2) var(--space-3);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--brand-primary);
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    flex-shrink: 0;
    margin-left: auto;
    margin-right: var(--space-2);
    min-width: auto; /* Let content define width but with padding */
    height: 36px;
    box-shadow: var(--shadow-sm);
}

.model-selector-header-mobile svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.model-selector-header-mobile:hover,
.model-selector-header-mobile:active {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
    box-shadow: 0 4px 16px rgba(48, 110, 140, 0.3);
    transform: translateY(-1px) scale(1.02);
}

.model-selector-header-mobile:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.25);
}

.model-selector-header-mobile:hover svg {
    transform: rotate(180deg);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    position: relative;
    z-index: 100; /* Lower z-index to prevent overlapping with modals and dropdowns */
    animation: fadeIn 0.5s ease-out 0.2s both;
    padding: var(--space-2) 0; /* Add vertical padding to make it larger */
    min-height: 48px; /* Ensure minimum height */
}

.header-profile {
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-3);
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    position: relative;
    z-index: 10001; /* Higher than header-right to ensure it's on top */
    overflow: hidden; /* Changed to hidden to ensure circular shape */
}

/* When header-profile has text, make it pill-shaped */
.header-profile:has(.profile-text:not([style*="display: none"])) {
    border-radius: var(--radius-full);
    padding: var(--space-3) var(--space-4);
    width: auto;
    min-width: 44px;
    min-height: 44px;
    gap: var(--space-2);
}

.header-profile::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: var(--brand-gradient-subtle);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

/* When header-profile has text, make ::before pill-shaped */
.header-profile:has(.profile-text:not([style*="display: none"]))::before {
    border-radius: var(--radius-full);
}

.header-profile:hover::before {
    opacity: 1;
}

.header-profile:hover {
    background: var(--bg-hover);
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.2);
}

.header-profile svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    position: relative;
    z-index: 1; /* Ensure SVG is above ::before pseudo-element */
}

.header-profile .profile-text {
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    display: inline;
    position: relative;
    z-index: 1; /* Ensure text is above ::before pseudo-element */
}

.header-profile .profile-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-profile .profile-icon svg {
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

/* === PROFILE DROPDOWN MENU === */
.profile-menu-wrapper {
    position: relative;
    z-index: 1000 !important; /* Reasonable z-index, lower than modals (10000) */
}

.profile-dropdown {
    position: fixed; /* Use fixed instead of absolute to escape overflow: hidden */
    /* Calculate position relative to profile button */
    top: auto;
    bottom: auto;
    right: auto;
    left: auto;
    width: 320px;
    max-width: calc(100vw - var(--space-4) - env(safe-area-inset-left, 0) - env(safe-area-inset-right, 0));
    background: var(--bg-base) !important; /* Force background color */
    border: 1px solid var(--border-light) !important; /* Force border */
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl) !important; /* Force shadow */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transition: all var(--transition-base);
    z-index: 1001 !important; /* Reasonable z-index, above header-right (100) but below modals (10000) */
    overflow: hidden;
    box-sizing: border-box;
    pointer-events: none; /* Disable pointer events when hidden */
    /* Ensure dropdown is always visible when active */
    min-height: 100px; /* Minimum height to ensure visibility */
}

.profile-dropdown.active {
    opacity: 1 !important; /* Force opacity to 1 when active */
    visibility: visible !important; /* Force visibility when active */
    transform: translateY(0) scale(1) !important; /* Force transform when active */
    pointer-events: auto !important; /* Enable pointer events when active */
    display: block !important; /* Force display when active */
}

.profile-dropdown-header {
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-light);
}

.profile-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    overflow: hidden;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-email {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--space-1);
}

.profile-member-id {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-1);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.member-id-label {
    opacity: 0.7;
}

.member-id-value {
    font-weight: 600;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.profile-tier {
    margin-top: var(--space-1);
}

.profile-dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-1) 0;
}

.profile-dropdown-menu {
    padding: var(--space-2) 0;
}

.profile-menu-item {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
    text-align: left;
}

.profile-menu-item:hover {
    background: var(--bg-hover);
}

.profile-menu-item:active {
    background: var(--bg-elevated);
}

.profile-menu-item svg {
    flex-shrink: 0;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.profile-menu-item:hover svg {
    color: var(--text-primary);
}

.profile-menu-item span {
    flex: 1;
}

.profile-menu-item-admin svg {
    color: var(--green-500);
}

.profile-menu-item-admin:hover svg {
    color: var(--green-600);
}

.profile-menu-item-danger {
    color: var(--red-500);
}

.profile-menu-item-danger svg {
    color: var(--red-500);
}

.profile-menu-item-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--red-600);
}

.profile-menu-item-danger:hover svg {
    color: var(--red-600);
}

[data-theme="dark"] .profile-dropdown {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
}

[data-theme="dark"] .profile-dropdown-header {
    background: var(--bg-primary);
    border-bottom-color: var(--border-medium);
}

[data-theme="dark"] .profile-dropdown-divider {
    background: var(--border-medium);
}

/* === TIER BADGE === */
.tier-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    background: var(--bg-hover);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    white-space: nowrap;
}

.tier-badge i {
    font-size: 0.7rem;
    color: var(--tier-color, var(--gray-500));
}

.tier-badge-text {
    color: var(--tier-color, var(--gray-500));
}

/* Tier-specific colors */
.tier-badge-starter_trial {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-starter_trial .tier-badge-text {
    color: #6b7280;
}

.tier-badge-pro_trial {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

.tier-badge-pro_trial .tier-badge-text {
    color: #3b82f6;
}

.tier-badge-ultra_trial {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
}

.tier-badge-ultra_trial .tier-badge-text {
    color: #8b5cf6;
}

/* Legacy tier support (backward compatibility) */
.tier-badge-free_trial {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-free_trial .tier-badge-text {
    color: #6b7280;
}

.tier-badge-starter {
    background: rgba(107, 114, 128, 0.1);
    border-color: rgba(107, 114, 128, 0.3);
}

.tier-badge-starter .tier-badge-text {
    color: #6b7280;
}

.tier-badge-pro {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

.tier-badge-pro i,
.tier-badge-pro .tier-badge-text {
    color: #3b82f6;
}

.tier-badge-ultra {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
}

.tier-badge-ultra i,
.tier-badge-ultra .tier-badge-text {
    color: #8b5cf6;
}

.tier-badge-premium {
    background: rgba(48, 110, 140, 0.1);
    border-color: rgba(48, 110, 140, 0.3);
}

.tier-badge-premium i,
.tier-badge-premium .tier-badge-text {
    color: var(--brand-primary);
}

.tier-badge-premium_plus {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
}

.tier-badge-premium_plus i,
.tier-badge-premium_plus .tier-badge-text {
    color: #f59e0b;
}

.tier-badge-premium_pro {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.tier-badge-premium_pro i,
.tier-badge-premium_pro .tier-badge-text {
    color: #ef4444;
}

.tier-badge-admin {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
}

.tier-badge-admin i,
.tier-badge-admin .tier-badge-text {
    color: #10b981;
}

[data-theme="dark"] .tier-badge {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
}

[data-theme="dark"] .tier-badge-pro {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
}

[data-theme="dark"] .tier-badge-ultra {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.4);
}

[data-theme="dark"] .tier-badge-premium {
    background: rgba(48, 110, 140, 0.15);
    border-color: rgba(48, 110, 140, 0.4);
}

[data-theme="dark"] .tier-badge-premium_plus {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.4);
}

[data-theme="dark"] .tier-badge-premium_pro {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
}

[data-theme="dark"] .tier-badge-admin {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
}

/* === MESSAGES AREA === */
.messages-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
    background: var(--bg-base);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    z-index: 1;
    /* Prevent scrollbar when content doesn't overflow */
    scrollbar-gutter: stable;
    /* Performance optimizations */
    will-change: scroll-position;
    contain: layout style paint;
    /* Layout for centering welcome screen */
    display: flex;
    flex-direction: column;
    justify-content: center; /* Center content vertically */
}

/* Allow scrolling when showing welcome screen only if content overflows */
.messages-area:has(.welcome:not([style*="display: none"])) {
    overflow-y: hidden;
    overflow-x: hidden;
    overscroll-behavior: contain;
}

/* Enable scrolling only when welcome content actually overflows */
.messages-area:has(.welcome:not([style*="display: none"])) .welcome {
    max-height: 100%;
}

/* Hide messages container when welcome screen is visible to prevent layout issues */
/* CRITICAL FIX: Only hide if welcome screen is actually visible (not just exists) */
.messages-area:has(.welcome:not([style*="display: none"]):not([style*="display:none"])) .messages {
    display: none !important;
}

/* CRITICAL FIX: Ensure messages container is visible when it has content */
.messages-area .messages:not(:empty) {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* CRITICAL FIX: Ensure message elements are visible after loading */
.message.assistant:not(.loading-message) {
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
}

.message.assistant:not(.loading-message) .message-bubble {
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
}

.message.assistant:not(.loading-message) .message-text {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
}

/* When welcome content overflows, enable scrolling on messages-area */
.messages-area:has(.welcome:not([style*="display: none"])):has(.welcome[data-overflow="true"]) {
    overflow-y: auto;
    scrollbar-width: thin;
}

/* Enable scrolling when there are messages */
.messages-area:has(.messages:not(:empty)) {
    overflow-y: auto;
    display: block; /* Restore block display when messages are present to allow normal scrolling behavior */
    justify-content: flex-start; /* Align content to top when messages exist */
}

/* === WELCOME === */
.welcome {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: auto;
    padding: var(--space-4);
    animation: fadeIn 0.4s ease;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-left: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    position: relative;
    /* Prevent unnecessary scrolling when content fits */
    flex-shrink: 0;
    margin: auto; /* Center vertically and horizontally */
}

/* Responsive welcome padding */
@media (min-width: 640px) {
    .welcome {
        padding: var(--space-6);
        padding-left: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-right, 0)));
    }
}

@media (min-width: 1024px) {
    .welcome {
        padding: var(--space-8);
        padding-left: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-right, 0)));
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.welcome-content {
    max-width: min(900px, calc(100vw - 2rem));
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-8);
    padding: var(--space-4) var(--space-2);
    box-sizing: border-box;
    /* Ensure content fits within viewport when possible */
    flex-shrink: 0;
    /* Better spacing and visual appeal */
    margin: 0 auto;
}

/* Responsive welcome content */
@media (min-width: 640px) {
    .welcome-content {
        max-width: min(900px, calc(100vw - 4rem));
        gap: var(--space-10);
    }
}

@media (min-width: 1024px) {
    .welcome-content {
        max-width: min(1024px, calc(100vw - 6rem));
        gap: var(--space-12);
    }
}

.welcome-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    text-align: center;
    margin-bottom: var(--space-4);
    width: 100%;
}

.welcome-icon {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-2xl);
    background: var(--brand-gradient);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 12px 32px rgba(48, 110, 140, 0.3);
    margin-bottom: 0;
    position: relative;
    animation: float 3s ease-in-out infinite;
    transition: transform var(--transition-smooth);
}

.welcome-icon:hover {
    transform: scale(1.05);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.welcome-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: var(--radius-2xl);
    background: var(--brand-gradient);
    opacity: 0.3;
    z-index: -1;
    filter: blur(12px);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.05);
    }
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-xl);
    display: block;
    max-width: 100%;
    max-height: 100%;
    transition: transform var(--transition-smooth);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.welcome-icon:hover .logo-img {
    transform: scale(1.05) rotate(2deg);
    filter: drop-shadow(0 4px 8px rgba(48, 110, 140, 0.3));
}

.logo-img[src=""],
.logo-img:not([src]) {
    display: none;
}

/* Fallback for logo if image fails to load */
.welcome-icon:has(.logo-img[src=""])::before,
.welcome-icon:has(.logo-img:not([src]))::before {
    content: '🎯';
    font-size: 3rem;
    display: block;
}

.welcome-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 600; /* GPT/Gemini style - slightly lighter */
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em; /* GPT/Gemini style */
    line-height: 1.3;
    position: relative;
    margin: 0;
    padding: 0;
    transition: opacity 0.3s ease-out, transform 0.3s ease-out, background 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Responsive welcome title */
@media (min-width: 640px) {
    .welcome-title {
        font-size: 3rem;
    }
}

@media (min-width: 1024px) {
    .welcome-title {
        font-size: 3.5rem;
    }
}

/* Green theme welcome title */
[data-theme="light-green"] .welcome-title,
[data-theme="dark-green"] .welcome-title {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 50%, var(--text-tertiary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 1.5rem;
    transition: opacity 0.3s ease-out, transform 0.3s ease-out, color 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-secondary);
    max-width: 500px;
    line-height: 1.6;
    letter-spacing: -0.011em; /* GPT/Gemini style */
    margin: 0;
    padding: 0;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Responsive welcome subtitle */
@media (min-width: 640px) {
    .welcome-subtitle {
        font-size: 1.75rem;
    }
}

@media (min-width: 1024px) {
    .welcome-subtitle {
        font-size: 2rem;
    }
}

/* === INPUT CONTAINER LARGE === */
.input-container-large {
    width: 100%;
    max-width: min(768px, calc(100vw - 2rem));
    margin: 0 auto;
    box-sizing: border-box;
    /* Prevent overflow */
    overflow: visible;
    position: relative;
    z-index: 1;
}

/* Responsive large input container */
@media (min-width: 640px) {
    .input-container-large {
        max-width: min(768px, calc(100vw - 4rem));
    }
}

@media (min-width: 1024px) {
    .input-container-large {
        max-width: min(900px, calc(100vw - 6rem));
    }
}

@media (min-width: 1280px) {
    .input-container-large {
        max-width: min(1024px, calc(100vw - 8rem));
    }
}

/* === GEMINI/GPT STYLE INPUT BOX === */
.input-box-large {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 24px;
    padding: 12px 16px;
    box-shadow: 
        0 1px 2px rgba(0, 0, 0, 0.05),
        0 4px 12px rgba(0, 0, 0, 0.04);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: visible;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    z-index: 1;
}

/* Responsive large input box */
@media (min-width: 640px) {
    .input-box-large {
        gap: var(--space-3);
        padding: 14px 20px;
        border-radius: 28px;
    }
}

.input-box-large.drag-over {
    border-color: var(--accent);
    background: rgba(48, 110, 140, 0.05);
}

/* === ATTACH DROPDOWN LARGE (Welcome Screen) === */
.attach-dropdown-large {
    position: relative;
    flex-shrink: 0;
    z-index: 1000;
    isolation: isolate;
    pointer-events: auto;
}

/* === GEMINI/GPT STYLE ATTACH BUTTON === */
.attach-dropdown-toggle-large {
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: rgba(0, 0, 0, 0.5);
    cursor: pointer;
    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
    position: relative;
    pointer-events: auto;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.attach-dropdown-toggle-large:hover {
    color: rgba(0, 0, 0, 0.7);
    background: rgba(0, 0, 0, 0.05);
    transform: none; /* No transform - keep it still */
}

.attach-dropdown-toggle-large:active {
    background: rgba(0, 0, 0, 0.1);
    transform: scale(0.96);
    transition: transform 0.1s ease;
}

[data-theme="dark"] .attach-dropdown-toggle-large {
    color: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] .attach-dropdown-toggle-large:hover {
    color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.1);
}

.attach-dropdown-icon-large {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    transform-origin: center;
}

.attach-dropdown-toggle-large.active .attach-dropdown-icon-large {
    transform: rotate(45deg);
}

.attach-dropdown-menu-large {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 0;
    display: none;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.12),
        0 8px 24px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    padding: 6px !important;
    min-width: 180px !important;
    max-width: 220px !important;
    width: auto !important;
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px) scale(0.98);
    transition: 
        opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1),
        visibility 0.15s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    overflow: hidden;
    z-index: 99999;
    box-sizing: border-box;
}

.attach-dropdown-menu-large.active {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.attach-dropdown-item-large {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    width: 100%;
    padding: 10px 14px !important;
    border: none;
    background: transparent;
    color: var(--text-primary, #1a1a1a);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: -0.01em;
    text-align: left;
    cursor: pointer;
    border-radius: 8px;
    transition: 
        background-color 0.15s cubic-bezier(0.4, 0, 0.2, 1),
        color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    position: relative;
    overflow: hidden;
    justify-content: flex-start !important;
    box-sizing: border-box;
    margin: 0;
    white-space: nowrap;
}

.attach-dropdown-item-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.08) 0%, 
        rgba(168, 85, 247, 0.08) 100%);
    opacity: 0;
    transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.attach-dropdown-item-large:hover {
    background: rgba(48, 110, 140, 0.08);
    color: var(--text-primary, #1a1a1a);
}

.attach-dropdown-item-large:hover svg {
    opacity: 1;
    transform: scale(1.05);
}

.attach-dropdown-item-large:hover::before {
    opacity: 1;
}

.attach-dropdown-item-large:active {
    background: rgba(48, 110, 140, 0.12);
    transform: scale(0.98);
}

.attach-dropdown-item-large svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0.8;
}

.attach-dropdown-item-large:hover svg {
    transform: scale(1.1);
}

.attach-dropdown-item-large span {
    flex: 1;
    white-space: nowrap;
    position: relative;
    z-index: 1;
    padding-left: 0 !important;
    text-align: left;
    margin-left: 0 !important;
    line-height: 1.4;
}

/* Dark theme support for large dropdown */
[data-theme="dark"] .attach-dropdown-menu-large,
.dark .attach-dropdown-menu-large {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

[data-theme="dark"] .attach-dropdown-item-large,
.dark .attach-dropdown-item-large {
    color: var(--text-primary, #ffffff);
}

[data-theme="dark"] .attach-dropdown-item-large::before,
.dark .attach-dropdown-item-large::before {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.12) 0%, 
        rgba(168, 85, 247, 0.12) 100%);
}

[data-theme="dark"] .attach-dropdown-item-large:hover,
.dark .attach-dropdown-item-large:hover {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.15) 0%, 
        rgba(168, 85, 247, 0.15) 100%);
}

[data-theme="dark"] .attach-dropdown-item-large:active,
.dark .attach-dropdown-item-large:active {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.2) 0%, 
        rgba(168, 85, 247, 0.2) 100%);
}

[data-theme="dark"] .attach-dropdown-item-large svg,
.dark .attach-dropdown-item-large svg {
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.3));
}

/* Hide camera button when camera is not available */
.attach-dropdown-item-large.camera-hidden,
#cameraBtnWelcome.camera-hidden,
#cameraBtn.camera-hidden {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden !important;
    pointer-events: none !important;
}

/* Legacy support - keep old classes for backward compatibility */
.attach-btn-group-large {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    flex-shrink: 0;
}

.attach-btn-large {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.attach-btn-large:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.attach-btn-large:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.camera-btn-large {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.camera-btn-large:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.camera-btn-large:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

/* === GEMINI/GPT STYLE FOCUS STATE === */
.input-box-large:focus-within {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.12);
    box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.06),
        0 8px 24px rgba(0, 0, 0, 0.08);
    transform: none; /* No transform - keep it still */
}

/* Dark mode adjustments */
[data-theme="dark"] .input-box-large {
    background: rgba(30, 30, 30, 0.8);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 1px 2px rgba(0, 0, 0, 0.3),
        0 4px 12px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .input-box-large:focus-within {
    background: rgba(35, 35, 35, 0.95);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.4),
        0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Green theme adjustments */
[data-theme="light-green"] .input-box-large {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(34, 197, 94, 0.1);
}

[data-theme="light-green"] .input-box-large:focus-within {
    border-color: rgba(34, 197, 94, 0.2);
}

[data-theme="dark-green"] .input-box-large {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(34, 197, 94, 0.15);
}

[data-theme="dark-green"] .input-box-large:focus-within {
    background: rgba(20, 30, 50, 0.95);
    border-color: rgba(34, 197, 94, 0.25);
}

/* === GEMINI/GPT STYLE INPUT FIELD === */
.input-field-large {
    flex: 1;
    width: 100%;
    border: none;
    background: transparent;
    resize: none;
    font-family: var(--font-body);
    font-size: 16px; /* Prevent zoom on iOS */
    color: var(--text-primary);
    min-height: 24px;
    max-height: 200px;
    position: relative;
    z-index: 10002 !important;
    pointer-events: auto !important;
    cursor: text !important;
    overflow-y: auto;
    overflow-x: hidden;
    line-height: 1.5;
    padding: 0;
    box-sizing: border-box;
    word-wrap: break-word;
    overflow-wrap: break-word;
    vertical-align: middle;
    font-weight: 400;
    letter-spacing: -0.01em;
    -webkit-user-select: text !important;
    user-select: text !important;
}

/* CRITICAL FIX: Ensure input field is always clickable and typeable */
.input-field-large:not(:disabled):not([readonly]) {
    pointer-events: auto !important;
    cursor: text !important;
    opacity: 1 !important;
}

.input-field-large:disabled,
.input-field-large[readonly] {
    pointer-events: none !important;
    cursor: not-allowed !important;
    opacity: 0.6 !important;
}

.input-field-large:focus {
    outline: none;
}

.input-field-large::placeholder {
    color: rgba(0, 0, 0, 0.4);
    font-weight: 400;
}

[data-theme="dark"] .input-field-large::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.input-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
    padding-top: 0;
    border-top: none;
    position: relative;
    z-index: 10;
    flex-shrink: 0;
}

.model-selector-large {
    padding: var(--space-3) var(--space-4);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: none; /* Hidden by default, shown only when authenticated */
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--brand-primary);
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 120px;
    min-height: 44px;
    text-align: center;
}

.model-selector-large::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--brand-gradient-subtle);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.model-selector-large:hover::before {
    opacity: 1;
}

.model-selector-large:hover {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.2);
    transform: translateY(-1px);
}

.model-selector-large svg {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-smooth);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.model-selector-large:hover svg {
    transform: rotate(180deg);
}

/* === GEMINI/GPT STYLE SEND BUTTON === */
.send-btn-large {
    padding: 0;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.send-btn-large:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: none; /* No transform - keep it still */
}

.send-btn-large:active:not(:disabled) {
    transform: scale(0.96);
    transition: transform 0.1s ease;
}

.send-btn-large svg {
    position: relative;
    z-index: 1;
    width: 18px;
    height: 18px;
    transition: none; /* No animation - keep it still */
}

.send-btn-large:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .send-btn-large:disabled {
    background: rgba(255, 255, 255, 0.1);
}

/* CRITICAL FIX: Stop button should always be enabled so user can cancel */
.send-btn-large.stop-btn,
.send-btn-large.stop-btn:disabled {
    opacity: 1 !important;
    cursor: pointer !important;
    pointer-events: auto !important;
}

.send-btn-large.stop-btn {
    background: linear-gradient(135deg, #ef4444, #dc2626);
}

.send-btn-large.stop-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    box-shadow: 0 6px 16px rgba(220, 38, 38, 0.4);
}

.send-btn-large svg {
    width: 20px;
    height: 20px;
}

/* === SUGGESTIONS HORIZONTAL === */
.suggestions-horizontal {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    width: 100%;
    max-width: 600px;
}

.suggestion-btn {
    padding: var(--space-3) var(--space-5);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-smooth);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.suggestion-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--brand-gradient);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.suggestion-btn:hover {
    border-color: var(--brand-primary);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.2);
    color: white;
}

.suggestion-btn:hover::before {
    opacity: 0.15;
}

.suggestion-btn:hover svg {
    color: white;
    transform: scale(1.1);
    filter: brightness(1.2);
}

.suggestion-btn svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
    position: relative;
    z-index: 1;
}

.suggestion-btn span {
    position: relative;
    z-index: 1;
}

/* Preferred suggestion button (based on user learning) */
.suggestion-btn.preferred-suggestion {
    border-color: var(--brand-primary);
    background: linear-gradient(135deg, rgba(48, 110, 140, 0.1), rgba(140, 191, 86, 0.1));
    box-shadow: 0 2px 8px rgba(48, 110, 140, 0.15);
    animation: preferredPulse 2s ease-in-out infinite;
}

@keyframes preferredPulse {
    0%, 100% {
        box-shadow: 0 2px 8px rgba(48, 110, 140, 0.15);
    }
    50% {
        box-shadow: 0 4px 12px rgba(48, 110, 140, 0.25);
    }
}

.suggestion-btn.preferred-suggestion:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 16px rgba(48, 110, 140, 0.3);
}

/* === MESSAGES === */
.messages {
    display: flex;
    flex-direction: column;
    padding: var(--space-4) 0;
    min-height: 100%;
    max-width: min(900px, calc(100vw - 2rem));
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
    /* Prevent overflow */
    overflow-x: hidden;
    /* Support for safe areas - match welcome screen padding */
    padding-left: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    position: relative;
    z-index: 1;
}

/* Hide messages container when empty to allow welcome screen to be centered properly */
.messages:empty {
    display: none !important;
    min-height: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    height: 0 !important;
}

/* Mobile optimizations */
@media (max-width: 639px) {
    .messages {
        max-width: 100%;
        padding: var(--space-4) 0;
        padding-left: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    }
}

/* Responsive max-width for different screen sizes - match welcome screen */
@media (min-width: 640px) {
    .messages {
        max-width: min(900px, calc(100vw - 4rem));
        padding-left: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-right, 0)));
    }
}

@media (min-width: 1024px) {
    .messages {
        max-width: min(1024px, calc(100vw - 6rem));
        padding: var(--space-8) 0;
        padding-left: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-8), calc(var(--space-8) + env(safe-area-inset-right, 0)));
    }
}

@media (min-width: 1280px) {
    .messages {
        max-width: min(1024px, calc(100vw - 8rem));
    }
}

/* ไม่ใช้ order แล้ว - ใช้ JavaScript แทน */

.message {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    animation: messageSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    align-items: flex-start;
    max-width: 100%;
    overflow: hidden;
    position: relative;
    box-sizing: border-box;
    width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin-bottom: var(--space-3);
    /* Performance optimization */
    contain: layout style;
    transform: translateZ(0);
    /* Smooth transitions for all interactions */
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
                opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Mobile optimizations */
@media (max-width: 639px) {
    .message {
        max-width: 100%;
        padding: var(--space-3) var(--space-3);
        gap: var(--space-2);
    }
    
    .message-bubble {
        padding: var(--space-3) var(--space-3);
    }
    
    .message-avatar {
        width: 28px !important;
        height: 28px !important;
        min-width: 28px !important;
        min-height: 28px !important;
    }
}

/* Responsive message padding */
@media (min-width: 640px) {
    .message {
        gap: var(--space-4);
        padding: var(--space-4) var(--space-5);
        margin-bottom: var(--space-4);
    }
}

@media (min-width: 1024px) {
    .message {
        padding: var(--space-4) var(--space-6);
        max-width: 90%;
    }
}

/* Ensure loading messages align the same as completed AI messages */
.message.assistant[id^="loading-"] {
    align-items: flex-end;
}

.message.assistant {
    align-self: flex-start;
    margin-right: auto;
    margin-left: 0;
    animation: messageSlideInLeft 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    align-items: flex-start;
    opacity: 0;
    animation-fill-mode: forwards;
}

/* Override animation for loading messages - make them visible immediately */
.message.assistant[id^="loading-"] {
    animation: none !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Enhanced loading animation for AI messages */
.message.assistant[id^="loading-"] .message-bubble {
    animation: loadingPulse 2s ease-in-out infinite;
}

@keyframes loadingPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.message.user {
    align-self: flex-end;
    margin-left: auto;
    margin-right: 0;
    flex-direction: row-reverse;
    animation: messageSlideInRight 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    align-items: flex-start;
    opacity: 1 !important; /* Ensure user messages are always visible */
    visibility: visible !important;
    display: flex !important;
}

@keyframes messageSlideInLeft {
    0% {
        opacity: 0;
        transform: translateX(-24px) translateY(12px) scale(0.96);
        filter: blur(4px);
    }
    50% {
        opacity: 0.6;
        transform: translateX(-8px) translateY(4px) scale(0.98);
        filter: blur(1px);
    }
    100% {
        opacity: 1;
        transform: translateX(0) translateY(0) scale(1);
        filter: blur(0);
    }
}

@keyframes messageSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) translateY(8px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateY(0) scale(1);
    }
}

/* Premium AI Message Animations - GPT/Gemini Style */
@keyframes bubbleFadeIn {
    0% {
        opacity: 0;
        transform: translateY(8px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes textFadeIn {
    0% {
        opacity: 0;
        transform: translateY(4px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger animation for multiple messages */
.message.assistant:nth-child(1) {
    animation-delay: 0s;
}

.message.assistant:nth-child(2) {
    animation-delay: 0.05s;
}

.message.assistant:nth-child(3) {
    animation-delay: 0.1s;
}

.message.assistant:nth-child(4) {
    animation-delay: 0.15s;
}

.message.assistant:nth-child(n+5) {
    animation-delay: 0.2s;
}

.message-avatar {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    display: flex !important;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: visible !important;
    visibility: visible !important;
    align-self: flex-start;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.message.assistant .message-avatar {
    background: transparent;
    padding: 0;
    position: relative;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
    animation: avatarFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

.message.assistant .message-avatar:hover {
    transform: scale(1.08) translateY(-2px);
}

@keyframes avatarFadeIn {
    0% {
        opacity: 0;
        transform: scale(0.8) rotate(-5deg);
    }
    100% {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

.message.assistant .message-avatar svg {
    filter: drop-shadow(0 2px 8px rgba(48, 110, 140, 0.3));
    transition: filter 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.assistant .message-avatar:hover svg {
    filter: drop-shadow(0 4px 12px rgba(48, 110, 140, 0.5));
    transform: rotate(5deg);
}

.message-avatar .avatar-img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
    border-radius: var(--radius-full);
    position: relative;
    z-index: 10 !important;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.message-avatar svg .ng-logo-text {
    text-anchor: middle !important;
    dominant-baseline: middle !important;
    alignment-baseline: middle !important;
    transform: translateY(0.5px);
}

/* Loading ring animation for AI avatar */
.message-avatar.loading {
    position: relative !important;
    overflow: visible !important;
    animation: none !important; /* Prevent any conflicting animations */
}

.message-avatar.loading .avatar-img {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    position: relative;
    z-index: 2;
}

/* AI Thinking Animation - Neural Network Style */
.ai-thinking-orb {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    width: 40px !important;
    height: 40px !important;
    pointer-events: none !important;
    z-index: 1 !important;
}

.ai-thinking-core {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    width: 12px !important;
    height: 12px !important;
    border-radius: 50% !important;
    background: radial-gradient(circle, #60a5fa, #3b82f6) !important;
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.6), 0 0 24px rgba(59, 130, 246, 0.3) !important;
    animation: aiCorePulse 2s ease-in-out infinite !important;
}

.ai-thinking-node {
    position: absolute !important;
    width: 6px !important;
    height: 6px !important;
    border-radius: 50% !important;
    background: #60a5fa !important;
    box-shadow: 0 0 8px rgba(96, 165, 250, 0.8) !important;
    animation: aiNodeOrbit 3s linear infinite !important;
}

.ai-thinking-node:nth-child(2) {
    top: 0 !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    animation-delay: 0s !important;
}

.ai-thinking-node:nth-child(3) {
    top: 50% !important;
    right: 0 !important;
    transform: translateY(-50%) !important;
    animation-delay: -1s !important;
}

.ai-thinking-node:nth-child(4) {
    bottom: 0 !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    animation-delay: -2s !important;
}

.ai-thinking-node:nth-child(5) {
    top: 50% !important;
    left: 0 !important;
    transform: translateY(-50%) !important;
    animation-delay: -0.5s !important;
}

.ai-thinking-connection {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    width: 40px !important;
    height: 40px !important;
    border: 1px solid rgba(96, 165, 250, 0.3) !important;
    border-radius: 50% !important;
    animation: aiConnectionPulse 2.5s ease-in-out infinite !important;
}

.ai-thinking-connection:nth-child(6) {
    width: 28px !important;
    height: 28px !important;
    animation-delay: 0s !important;
}

.ai-thinking-connection:nth-child(7) {
    width: 40px !important;
    height: 40px !important;
    animation-delay: -0.8s !important;
}

@keyframes aiCorePulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
        box-shadow: 0 0 12px rgba(59, 130, 246, 0.6), 0 0 24px rgba(59, 130, 246, 0.3);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0.8;
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.8), 0 0 40px rgba(59, 130, 246, 0.5);
    }
}

@keyframes aiNodeOrbit {
    0% {
        transform: rotate(0deg) translateX(17px) rotate(0deg);
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: rotate(360deg) translateX(17px) rotate(-360deg);
        opacity: 0.6;
    }
}

@keyframes aiConnectionPulse {
    0%, 100% {
        opacity: 0.2;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* === Modern Fluid Loading Animation === */
.loading-message {
    opacity: 1;
    animation: fadeIn 0.3s ease;
}

/* Ultra Smooth AI Transition - No Gap Between Loading and Response */
.loading-message.fade-out {
    animation: fadeOut 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.message-bubble.loading-bubble.fade-out {
    opacity: 0;
    transform: translateY(-2px) scale(0.98);
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.message-bubble:not(.loading-bubble).fade-in {
    animation: aiMessageAppear 0.35s cubic-bezier(0.2, 0, 0.2, 1) forwards;
    opacity: 0;
}

/* CRITICAL FIX: Ensure message text is always visible after loading */
.message-bubble:not(.loading-bubble) .message-text {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
}

/* CRITICAL FIX: Ensure message bubble is visible after loading */
.message.assistant:not(.loading-message) .message-bubble {
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
}

.message-bubble.loading-bubble.transitioning {
    position: relative;
    overflow: hidden;
}

.message-bubble.loading-bubble.transitioning::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.3), 
        transparent
    );
    animation: aiShimmer 0.6s ease-in-out;
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    to {
        opacity: 0;
        transform: translateY(-2px) scale(0.98);
    }
}

@keyframes aiMessageAppear {
    0% {
        opacity: 0;
        transform: translateY(4px) scale(0.96);
        filter: blur(2px);
    }
    60% {
        opacity: 0.8;
        transform: translateY(-1px) scale(1.01);
        filter: blur(0.5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

@keyframes aiShimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* ... existing styles ... */

/* Typewriter Cursor */
.typing-cursor {
    display: inline-block;
    width: 6px;
    height: 16px;
    background-color: var(--text-primary);
    animation: blink 1s step-end infinite;
    vertical-align: middle;
    margin-left: 2px;
    border-radius: 1px;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Ensure messages are visible during typing */
.message-content {
    min-height: 24px;
}

.loading-bubble,
.message.assistant .message-bubble.loading-bubble {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0; /* Remove padding - let container handle it */
    background: transparent; /* Let premium container handle background */
    border: none; /* Remove border - let premium container handle it */
    border-radius: var(--radius-xl);
    border-bottom-left-radius: var(--radius-xs);
    box-shadow: none; /* Remove shadow - let premium container handle it */
    overflow: visible; /* Allow particles to show */
}

/* Container ใหม่ แบบไม่มีกรอบซ้อน */
.fluid-loader {
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    /* ไม่มี border หรือ background ซ้อนแล้ว */
}

/* ไอคอน Sparkle แบบไล่สี */
.fluid-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-primary);
    position: relative;
}

.fluid-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 4px rgba(var(--brand-primary-rgb), 0.3));
    animation: fluidPulse 2s infinite ease-in-out;
}

@keyframes fluidPulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.15); opacity: 1; filter: drop-shadow(0 0 8px rgba(var(--brand-primary-rgb), 0.5)); }
    100% { transform: scale(0.95); opacity: 0.8; }
}

/* ข้อความ Loading แบบเรียบหรู */
.fluid-text {
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 2px;
}

.fluid-text span.status-text {
    background: linear-gradient(90deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    /* -webkit-text-fill-color: transparent; เอาออกเพื่อให้่อ่านง่ายขึ้นในบาง Theme */
}

/* จุด 3 จุด แบบ Jumping Wave */
.fluid-dots {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    margin-left: 4px;
    margin-bottom: 3px;
    height: 14px;
}

.fluid-dot {
    width: 4px;
    height: 4px;
    background-color: var(--brand-primary);
    border-radius: 50%;
    animation: jumpWave 1.2s infinite ease-in-out;
}

.fluid-dot:nth-child(1) { animation-delay: 0s; }
.fluid-dot:nth-child(2) { animation-delay: 0.15s; }
.fluid-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes jumpWave {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* Dark mode adjustment */
[data-theme="dark"] .fluid-icon svg {
    filter: drop-shadow(0 0 6px rgba(168, 85, 247, 0.5));
}

[data-theme="dark"] .fluid-dot {
    background-color: #a855f7; /* สีม่วงอ่อนใน Dark mode */
}


/* GPT thinking message (for complex questions) */
.loading-thinking-text {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-style: italic;
    display: flex;
    align-items: center;
    gap: 2px;
}

.loading-dots {
    display: inline-block;
    width: 1ch;
    text-align: left;
}

.loading-dots::after {
    content: '...';
    animation: loadingDots 1.5s steps(4, end) infinite;
}

/* Search loading animation (Google-like) */
.loading-search-text {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 500;
}

.search-icon {
    font-size: var(--text-base);
    animation: searchPulse 1.5s ease-in-out infinite;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.search-text {
    color: var(--text-primary);
    font-weight: 500;
}

.loading-dots-search {
    display: inline-block;
    width: 1ch;
    text-align: left;
    margin-left: 2px;
}

.loading-dots-search::after {
    content: '...';
    animation: loadingDots 1.5s steps(4, end) infinite;
}

@keyframes searchPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes loadingRingSpin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes loadingDots {
    0% {
        content: '';
    }
    25% {
        content: '.';
    }
    50% {
        content: '..';
    }
    75%, 100% {
        content: '...';
    }
}

@keyframes dotPulse {
    0%, 100% {
        opacity: 0.4;
        transform: scale(0.8) translateY(0);
    }
    50% {
        opacity: 1;
        transform: scale(1.1) translateY(-4px);
    }
}

.message-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: relative;
}

.message.assistant .message-content {
    align-items: flex-start;
    /* Ultra subtle background - almost invisible, blends perfectly with page */
    background: rgba(0, 0, 0, 0.005); /* Extremely subtle - barely visible */
    border-radius: var(--radius-lg);
    padding: var(--space-2);
    margin: calc(var(--space-1) * -1);
    transition: background 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark theme - ultra subtle light tint */
[data-theme="dark"] .message.assistant .message-content {
    background: rgba(255, 255, 255, 0.008); /* Extremely subtle - barely visible */
}

/* Subtle hover effect */
.message.assistant:hover .message-content {
    background: rgba(0, 0, 0, 0.01); /* Just slightly more visible on hover */
}

[data-theme="dark"] .message.assistant:hover .message-content {
    background: rgba(255, 255, 255, 0.015); /* Just slightly more visible on hover */
}

.message.user .message-content {
    align-items: flex-end;
    opacity: 1 !important; /* Ensure message content is always visible */
    visibility: visible !important;
    display: flex !important;
}

.message-bubble {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    position: relative;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), 
                background 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-sizing: border-box;
    line-height: 1.6;
    /* Performance optimization */
    will-change: transform, box-shadow, opacity;
    transform: translateZ(0);
    /* Smooth entrance */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    /* CRITICAL FIX: Ensure bubble is visible */
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
}

/* CRITICAL FIX: Ensure non-loading bubbles are always visible */
.message-bubble:not(.loading-bubble) {
    opacity: 1 !important;
    visibility: visible !important;
    display: flex !important;
}

/* CRITICAL FIX: Ensure message text is visible in non-loading bubbles */
.message-bubble:not(.loading-bubble) .message-text {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
}

/* Mobile bubble optimizations */
@media (max-width: 639px) {
    .message-bubble {
        padding: var(--space-3) var(--space-3);
        border-radius: var(--radius-lg);
        font-size: var(--text-sm);
    }
}

/* Responsive bubble padding */
@media (min-width: 640px) {
    .message-bubble {
        padding: var(--space-4) var(--space-5);
        border-radius: var(--radius-xl);
    }
}

.message.assistant .message-bubble {
    background: var(--bg-elevated);
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-sm);
    animation: bubbleFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
    position: relative;
    color: var(--text-primary);
}

.message.user .message-bubble {
    background: linear-gradient(135deg, #306E8C 0%, #24556e 50%, #1a3d4f 100%);
    color: white;
    border-bottom-right-radius: var(--radius-sm);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.25), 0 2px 4px rgba(48, 110, 140, 0.15);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: none;
    opacity: 1 !important; /* Ensure bubble is always visible */
    visibility: visible !important;
    display: block !important;
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
}

.message.user .message-bubble::before {
    display: none;
}

.message.user:hover .message-bubble::before {
    left: 100%;
}

/* KidAi Code green theme - user message bubble */
[data-theme="light-green"] .message.user .message-bubble,
[data-theme="dark-green"] .message.user .message-bubble {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.message:hover .message-bubble {
    transform: translateY(-1px);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), 
                box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.assistant:hover .message-bubble {
    transform: translateY(-1px);
}

.message.user:hover .message-bubble {
    box-shadow: 0 6px 20px rgba(48, 110, 140, 0.35), 0 4px 8px rgba(48, 110, 140, 0.2);
    transform: translateY(-1px) scale(1.01);
    background: linear-gradient(135deg, #357a9e 0%, #2a5f7a 50%, #1f4a63 100%);
}

/* KidAi Code green theme - user message bubble hover */
[data-theme="light-green"] .message.user:hover .message-bubble,
[data-theme="dark-green"] .message.user:hover .message-bubble {
    box-shadow: 0 6px 16px rgba(34, 197, 94, 0.4);
}

.message-text {
    color: var(--text-primary);
    line-height: 1.75;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: break-word;
    max-width: 100%;
    font-size: var(--text-base);
    letter-spacing: -0.011em; /* GPT/Gemini style - tighter letter spacing */
    font-weight: 400;
    font-feature-settings: 'kern' 1, 'liga' 1; /* Better typography */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    animation: textFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

/* Enhanced animation for AI message text */
.message.assistant .message-text {
    animation: textFadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
    position: relative;
}

/* Thai text support - use Thai fonts for Thai characters */
.message-text:lang(th),
.message-text [lang="th"],
.message-text:has(*:lang(th)) {
    font-family: var(--font-thai);
    letter-spacing: 0.01em; /* Slightly looser for Thai */
}

/* Ultra subtle glow effect - on message-content */
.message.assistant .message-content::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.008) 0%, 
        rgba(140, 191, 86, 0.008) 100%);
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    z-index: -1;
}

.message.assistant:hover .message-content::after {
    opacity: 0.3; /* Very subtle even on hover */
}

.message.user .message-text {
    color: var(--text-primary);
    opacity: 1 !important; /* Ensure text is always visible */
    visibility: visible !important;
    display: block !important;
}

.message-text p {
    margin-bottom: var(--space-3);
    word-wrap: break-word;
    overflow-wrap: break-word;
    animation: paragraphFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Stagger animation for paragraphs in AI messages */
.message.assistant .message-text p:nth-child(1) {
    animation-delay: 0.1s;
}

.message.assistant .message-text p:nth-child(2) {
    animation-delay: 0.15s;
}

.message.assistant .message-text p:nth-child(3) {
    animation-delay: 0.2s;
}

.message.assistant .message-text p:nth-child(n+4) {
    animation-delay: 0.25s;
}

@keyframes paragraphFadeIn {
    0% {
        opacity: 0;
        transform: translateY(4px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-text p:last-child {
    margin-bottom: 0;
}

/* Links - Safe & Secure */
.message-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    margin: var(--space-1) var(--space-1) var(--space-1) 0;
    background: linear-gradient(135deg, rgba(48, 110, 140, 0.1), rgba(48, 110, 140, 0.05));
    border: 1px solid rgba(48, 110, 140, 0.3);
    border-radius: var(--radius-lg);
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    cursor: pointer;
    word-break: break-all;
    position: relative;
    box-shadow: 0 2px 4px rgba(48, 110, 140, 0.1);
    touch-action: manipulation;
}

.message-link::before {
    content: '🔗';
    font-size: 0.875em;
    opacity: 0.8;
    flex-shrink: 0;
}

.message-link:hover {
    background: linear-gradient(135deg, rgba(48, 110, 140, 0.2), rgba(48, 110, 140, 0.15));
    border-color: var(--accent);
    color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.25);
}

.message-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(48, 110, 140, 0.15);
}

.message.user .message-link {
    background: var(--bg-base);
    border-color: var(--border-medium);
    color: var(--text-primary);
}

.message.user .message-link:hover {
    background: var(--bg-elevated);
    border-color: var(--border-dark);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.message.user .message-link::before {
    filter: brightness(1.2);
}

/* Tables - Beautiful & Readable */
.message-text table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: var(--space-5) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--bg-base);
    display: table;
    max-width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border-light);
}

.message-text table thead {
    background: linear-gradient(135deg, var(--bg-elevated), var(--bg-hover));
    border-bottom: 2px solid var(--border-medium);
}

.message-text table th {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-medium);
    font-size: var(--text-sm);
    letter-spacing: 0.3px;
    white-space: nowrap;
}

.message-text table th:first-child {
    padding-left: var(--space-6);
}

.message-text table th:last-child {
    padding-right: var(--space-6);
}

.message-text table td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-size: var(--text-sm);
    line-height: 1.6;
    transition: background-color var(--transition-fast);
}

.message-text table td:first-child {
    padding-left: var(--space-6);
}

.message-text table td:last-child {
    padding-right: var(--space-6);
}

.message-text table tbody tr {
    transition: background-color var(--transition-fast);
}

.message-text table tbody tr:hover {
    background: var(--bg-hover);
}

.message-text table tbody tr:last-child td {
    border-bottom: none;
}

.message-text table tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.01);
}

.message-text table tbody tr:nth-child(even):hover {
    background: var(--bg-hover);
}

/* Code Blocks - Beautiful & Usable */
.code-block-wrapper {
    margin: var(--space-5) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--gray-900);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 100%;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.code-block-wrapper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.3));
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.code-block-lang {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    padding: var(--space-1) var(--space-2);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
}

.code-block-copy {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-block-copy:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.code-block-copy.copied {
    background: rgba(76, 175, 80, 0.2);
    border-color: rgba(76, 175, 80, 0.5);
    color: #4caf50;
}

.code-block-copy svg {
    flex-shrink: 0;
}

.code-block-pre {
    margin: 0;
    padding: var(--space-5);
    background: var(--gray-900);
    color: white;
    overflow-x: auto;
    font-size: var(--text-sm);
    line-height: 1.7;
    font-family: 'Courier New', 'Monaco', 'Menlo', 'Fira Code', 'Consolas', monospace;
    position: relative;
}

.code-block-pre::-webkit-scrollbar {
    height: 8px;
}

.code-block-pre::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
}

.code-block-pre::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
}

.code-block-pre::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.code-block-pre code {
    background: transparent;
    padding: 0;
    color: inherit;
    font-size: inherit;
    border-radius: 0;
    display: block;
    width: 100%;
    font-family: inherit;
}

.code-block-pre code.hljs {
    background: transparent;
    padding: 0;
}

/* Syntax Highlighting Enhancements */
.code-block-pre code .hljs-keyword,
.code-block-pre code .hljs-selector-tag,
.code-block-pre code .hljs-built_in,
.code-block-pre code .hljs-name,
.code-block-pre code .hljs-tag {
    color: #c792ea;
}

.code-block-pre code .hljs-string,
.code-block-pre code .hljs-title,
.code-block-pre code .hljs-section,
.code-block-pre code .hljs-attribute,
.code-block-pre code .hljs-literal,
.code-block-pre code .hljs-template-tag,
.code-block-pre code .hljs-template-variable,
.code-block-pre code .hljs-type,
.code-block-pre code .hljs-addition {
    color: #c3e88d;
}

.code-block-pre code .hljs-comment,
.code-block-pre code .hljs-quote,
.code-block-pre code .hljs-deletion,
.code-block-pre code .hljs-meta {
    color: #546e7a;
    font-style: italic;
}

.code-block-pre code .hljs-number,
.code-block-pre code .hljs-regexp,
.code-block-pre code .hljs-symbol,
.code-block-pre code .hljs-variable {
    color: #f78c6c;
}

.code-block-pre code .hljs-function,
.code-block-pre code .hljs-title.function_ {
    color: #82aaff;
}

.code-block-pre code .hljs-class,
.code-block-pre code .hljs-title.class_ {
    color: #ffcb6b;
}

.message-text pre {
    background: var(--gray-900);
    color: white;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-3) 0;
    font-size: var(--text-sm);
    line-height: 1.6;
    max-width: 100%;
    animation: codeBlockFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
    position: relative;
}

@keyframes codeBlockFadeIn {
    0% {
        opacity: 0;
        transform: translateY(8px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message.user .message-text pre {
    background: rgba(0, 0, 0, 0.3);
}

.message-text code:not(.hljs) {
    padding: 2px 6px;
    background: var(--bg-hover);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-family: 'Courier New', 'Monaco', 'Menlo', monospace;
}

.message.user .message-text code:not(.hljs) {
    background: var(--bg-base);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

/* Lists */
.message-text ul,
.message-text ol {
    margin: var(--space-3) 0;
    padding-left: var(--space-6);
}

.message-text li {
    margin-bottom: var(--space-2);
    line-height: 1.6;
    animation: listItemFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Stagger animation for list items */
.message.assistant .message-text li:nth-child(1) {
    animation-delay: 0.1s;
}

.message.assistant .message-text li:nth-child(2) {
    animation-delay: 0.15s;
}

.message.assistant .message-text li:nth-child(3) {
    animation-delay: 0.2s;
}

.message.assistant .message-text li:nth-child(4) {
    animation-delay: 0.25s;
}

.message.assistant .message-text li:nth-child(n+5) {
    animation-delay: 0.3s;
}

@keyframes listItemFadeIn {
    0% {
        opacity: 0;
        transform: translateX(-4px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.message-text ul {
    list-style-type: disc;
}

.message-text ol {
    list-style-type: decimal;
}

/* Headings */
.message-text h1,
.message-text h2,
.message-text h3,
.message-text h4,
.message-text h5,
.message-text h6 {
    margin: var(--space-4) 0 var(--space-2) 0;
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
    letter-spacing: -0.02em; /* GPT/Gemini style - tighter spacing for headings */
    animation: headingFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@keyframes headingFadeIn {
    0% {
        opacity: 0;
        transform: translateX(-8px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.message-text h1 {
    font-size: 1.5rem;
}

.message-text h2 {
    font-size: 1.25rem;
}

.message-text h3 {
    font-size: 1.125rem;
}

.message-text h4,
.message-text h5,
.message-text h6 {
    font-size: 1rem;
}

.message-actions {
    display: flex;
    gap: var(--space-2);
    opacity: 1; /* CRITICAL FIX: Always show actions buttons */
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    padding: var(--space-2);
    transform: translateY(0);
    margin-top: var(--space-2);
    visibility: visible !important;
}

.message:hover .message-actions {
    opacity: 1;
    transform: translateY(0);
}

.message.assistant .message-actions {
    justify-content: flex-start;
}

.message.user .message-actions {
    justify-content: flex-end;
}

.btn-message-action {
    padding: var(--space-2) var(--space-3);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex !important;
    align-items: center;
    gap: var(--space-2);
    box-shadow: var(--shadow-xs);
    touch-action: manipulation;
    animation: buttonFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
    position: relative;
    overflow: hidden;
    visibility: visible !important;
    opacity: 1 !important;
    min-height: 32px;
}

/* Stagger animation for action buttons */
.message-actions .btn-message-action:nth-child(1) {
    animation-delay: 0.05s;
}

.message-actions .btn-message-action:nth-child(2) {
    animation-delay: 0.1s;
}

.message-actions .btn-message-action:nth-child(3) {
    animation-delay: 0.15s;
}

.message-actions .btn-message-action:nth-child(n+4) {
    animation-delay: 0.2s;
}

@keyframes buttonFadeIn {
    0% {
        opacity: 0;
        transform: scale(0.9) translateY(4px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.btn-message-action:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-message-action.btn-feedback {
    position: relative;
}

.btn-message-action.btn-feedback.active {
    background: var(--bg-elevated);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-message-action.btn-feedback[data-feedback-type="like"].active {
    background: rgba(34, 197, 94, 0.1);
    border-color: #22c55e;
    color: #22c55e;
}

.btn-message-action.btn-feedback[data-feedback-type="dislike"].active {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #ef4444;
}

.btn-message-action.btn-feedback[data-feedback-type="like"].active svg {
    fill: #22c55e;
}

.btn-message-action.btn-feedback[data-feedback-type="dislike"].active svg {
    fill: #ef4444;
}

.message-loading {
    display: flex !important;
    gap: var(--space-2);
    align-items: center;
    padding: var(--space-2) 0;
    visibility: visible !important;
    opacity: 1 !important;
}

.loading-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--text-secondary);
    animation: dotPulse 1.4s infinite ease-in-out !important;
    animation-play-state: running !important;
    animation-fill-mode: both !important;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    will-change: transform, opacity !important;
    backface-visibility: hidden !important;
    transform: translateZ(0) !important;
    transform-origin: center center !important;
}

.message.user .loading-dot {
    background: rgba(255, 255, 255, 0.7);
}

.loading-dot:nth-child(1) {
    animation-delay: 0s;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes dotPulse {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: translateZ(0) scale(0.9);
    }
    30% {
        opacity: 1;
        transform: translateZ(0) scale(1);
    }
}

/* === INPUT SECTION === */
.input-section {
    padding: var(--space-4) var(--space-4);
    border-top: 1px solid var(--border-light);
    position: sticky;
    bottom: 0;
    z-index: 1000 !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: var(--bg-base);
    display: none;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* Support for safe areas */
    padding-bottom: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-bottom, 0)));
    padding-left: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0)));
    padding-right: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    overflow: visible !important;
    isolation: isolate;
}

/* Mobile input section optimizations */
@media (max-width: 639px) {
    .input-section {
        padding: var(--space-2) var(--space-3);
        padding-left: max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-right, 0)));
        padding-bottom: max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-bottom, 0)));
    }
}

/* Responsive input section */
@media (min-width: 640px) {
    .input-section {
        padding: var(--space-4) var(--space-5);
        padding-left: max(var(--space-5), calc(var(--space-5) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-5), calc(var(--space-5) + env(safe-area-inset-right, 0)));
        padding-bottom: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-bottom, 0)));
    }
}

@media (min-width: 1024px) {
    .input-section {
        padding: var(--space-4) var(--space-6);
        padding-left: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-left, 0)));
        padding-right: max(var(--space-6), calc(var(--space-6) + env(safe-area-inset-right, 0)));
    }
}

[data-theme="dark"] .input-section {
    background: var(--bg-base) !important;
}

[data-theme="light-green"] .input-section {
    background: rgba(255, 255, 255, 0.95) !important;
}

[data-theme="dark-green"] .input-section {
    background: rgba(15, 23, 42, 0.95) !important;
}

.input-section.active {
    display: block;
}

/* CRITICAL FIX: Ensure input section and its children are always interactive */
.input-section.active * {
    pointer-events: auto !important;
}

.input-section.active .input-container-new,
.input-section.active .input-field-new,
.input-section.active .input-field {
    pointer-events: auto !important;
    z-index: 10002 !important;
}

/* === NEW INPUT CONTAINER (Gemini/GPT Style) === */
.input-container-new {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 24px;
    padding: 12px 16px;
    box-shadow: 
        0 1px 2px rgba(0, 0, 0, 0.05),
        0 4px 12px rgba(0, 0, 0, 0.04);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: visible;
    width: 100%;
    max-width: min(900px, calc(100vw - 2rem));
    margin: 0 auto;
    box-sizing: border-box;
    z-index: 10001 !important;
    pointer-events: auto !important;
    isolation: isolate;
}

/* CRITICAL FIX: Ensure model selector is always on top and clickable */
.input-container-new .model-selector-wrapper-new {
    z-index: 10005 !important;
    pointer-events: auto !important;
    position: relative !important;
}

.input-container-new .model-btn-new,
.input-container-new #chatModelSelectorToggle {
    z-index: 10005 !important;
    pointer-events: auto !important;
    position: relative !important;
    cursor: pointer !important;
}

/* CRITICAL FIX: Prevent input field from blocking model selector */
.input-container-new .input-field-new {
    z-index: 1 !important;
    position: relative;
}

@media (min-width: 640px) {
    .input-container-new {
        gap: var(--space-3);
        padding: 14px 20px;
        border-radius: 28px;
        max-width: min(900px, calc(100vw - 4rem));
    }
}

@media (min-width: 1024px) {
    .input-container-new {
        max-width: min(1024px, calc(100vw - 6rem));
    }
}

.input-container-new:focus-within {
    border-color: rgba(48, 110, 140, 0.2);
    box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.06),
        0 8px 16px rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .input-container-new {
    background: rgba(40, 40, 40, 0.8);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 1px 2px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .input-container-new:focus-within {
    background: rgba(45, 45, 45, 0.9);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Model Button */
.model-btn-new {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: var(--text-xs);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
    white-space: nowrap;
    position: relative !important;
    z-index: 10005 !important;
    pointer-events: auto !important;
    user-select: none !important;
    -webkit-user-select: none !important;
}

/* Show model button on desktop, hide on mobile */
@media (max-width: 1024px) {
    .model-btn-new {
        display: none !important;
    }
}

@media (min-width: 1025px) {
    .model-btn-new {
        display: flex !important;
    }
}

.model-btn-new:hover {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(48, 110, 140, 0.2);
    color: var(--text-primary);
}

[data-theme="dark"] .model-btn-new {
    background: rgba(50, 50, 50, 0.9);
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-secondary);
}

[data-theme="dark"] .model-btn-new:hover {
    background: rgba(55, 55, 55, 1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Attachment Button */
.attach-btn-new {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
    position: relative;
    z-index: 10001 !important;
    pointer-events: auto !important;
}

.attach-btn-new:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

[data-theme="dark"] .attach-btn-new:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Input Field */
.input-field-new {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-family: var(--font-body);
    font-size: 16px;
    color: var(--text-primary);
    padding: 8px 0;
    min-height: 24px;
    max-height: 200px;
    overflow-y: auto;
    line-height: 1.5;
    outline: none;
    position: relative;
    z-index: 10002 !important;
    pointer-events: auto !important;
    cursor: text !important;
    -webkit-user-select: text !important;
    user-select: text !important;
}

/* CRITICAL FIX: Ensure input field is always clickable and typeable */
.input-field-new:not(:disabled):not([readonly]) {
    pointer-events: auto !important;
    cursor: text !important;
    opacity: 1 !important;
}

.input-field-new:disabled,
.input-field-new[readonly] {
    pointer-events: none !important;
    cursor: not-allowed !important;
    opacity: 0.6 !important;
}

.input-field-new::placeholder {
    color: var(--text-tertiary);
}

/* Send Button */
.send-btn-new {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #10b981 0%, #059669 50%, #047857 100%);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.send-btn-new:hover:not(:disabled) {
    background: linear-gradient(135deg, #059669 0%, #047857 50%, #065f46 100%);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    transform: scale(1.05);
}

.send-btn-new:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* AI Disclaimer New */
.ai-disclaimer-new {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-6);
    margin-bottom: 0;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    box-shadow: none;
    transition: color 0.3s ease;
    position: relative;
    max-width: min(900px, calc(100vw - 2rem));
    margin-left: auto;
    margin-right: auto;
}

.ai-disclaimer-new::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--space-4));
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-light) 50%, transparent 100%);
}

.ai-disclaimer-new svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.ai-disclaimer-new span {
    line-height: 1.5;
    font-weight: 500;
}

/* Model Selector Wrapper */
.model-selector-wrapper-new {
    position: relative;
    flex-shrink: 0;
    z-index: 10005 !important;
    pointer-events: auto !important;
    isolation: isolate;
}

/* Model Selector Menu New */
.model-selector-menu-new {
    position: absolute;
    bottom: calc(100% + var(--space-2));
    left: 0;
    width: 240px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 4px;
    display: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: 
        opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        visibility 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    z-index: 10003 !important;
}

.model-selector-menu-new.active {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1) !important;
    pointer-events: auto !important;
    z-index: 10003 !important;
}

.model-selector-item-new {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.model-selector-item-new:hover {
    background: rgba(0, 0, 0, 0.05);
}

.model-selector-item-new.active {
    background: rgba(48, 110, 140, 0.1);
}

.model-selector-item-content-new {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}

.model-selector-item-name-new {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.model-selector-item-desc-new {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.model-selector-check-new {
    color: var(--accent);
    opacity: 0;
    transition: opacity 0.2s ease;
    flex-shrink: 0;
    margin-left: var(--space-2);
}

.model-selector-item-new.active .model-selector-check-new {
    opacity: 1;
}

/* Attach Dropdown Menu New */
.attach-dropdown-new {
    position: relative;
    flex-shrink: 0;
    z-index: 10001 !important;
    pointer-events: auto !important;
}

.attach-dropdown-menu-new {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 4px;
    min-width: 180px;
    max-width: 220px;
    display: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: 
        opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        visibility 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    z-index: 10002 !important;
    flex-direction: column;
    gap: 2px;
}

.attach-dropdown-menu-new.active {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) scale(1) !important;
    pointer-events: auto !important;
    z-index: 10002 !important;
}

.attach-dropdown-item-new {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.attach-dropdown-item-new:hover {
    background: rgba(0, 0, 0, 0.05);
}

.attach-dropdown-item-new svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

[data-theme="dark"] .model-selector-menu-new,
[data-theme="dark"] .attach-dropdown-menu-new {
    background: rgba(26, 26, 26, 0.95);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .model-selector-item-new:hover,
[data-theme="dark"] .attach-dropdown-item-new:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Legacy support - keep old classes for backward compatibility */
.input-container {
    max-width: min(768px, calc(100vw - 2rem));
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
    overflow: visible !important;
    position: relative;
    z-index: 10001 !important;
}

.input-box {
    display: flex;
    align-items: flex-end;
    gap: var(--space-3);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-base);
    position: relative;
    z-index: 10001 !important;
    overflow: visible !important;
}

.input-section.drag-over {
    border-color: var(--accent);
    background: rgba(48, 110, 140, 0.05);
}

/* Image Preview Container */
.image-preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    max-width: 100%;
}

.image-preview-item {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--border-light);
    background: var(--bg-base);
    flex-shrink: 0;
}

.image-preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.image-preview-remove {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--error);
    color: white;
    border: 2px solid var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    font-weight: bold;
    transition: all var(--transition-base);
    z-index: 10;
}

.image-preview-remove:hover {
    background: var(--error-hover);
    transform: scale(1.1);
}

/* Message Images */
.message-images {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.message-image-item {
    position: relative;
    max-width: 300px;
    max-height: 300px;
    min-width: 100px;
    min-height: 100px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    background: var(--bg-elevated);
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.message-image {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.message-image:hover {
    transform: scale(1.02);
}

.message.user .message-image-item {
    max-width: 250px;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

[data-theme="dark"] .image-preview-container,
[data-theme="dark"] .message-image-item {
    border-color: var(--border-dark);
}

[data-theme="dark"] .image-preview-item {
    background: var(--bg-elevated-dark);
}

.input-field {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--text-primary);
    padding: var(--space-2) 0;
    min-height: 24px;
    max-height: 200px;
    overflow-y: auto;
    line-height: 1.5;
    position: relative;
    z-index: 10002 !important;
    pointer-events: auto !important;
    cursor: text !important;
    -webkit-user-select: text !important;
    user-select: text !important;
}

/* CRITICAL FIX: Ensure input field is always clickable and typeable */
.input-field:not(:disabled):not([readonly]) {
    pointer-events: auto !important;
    cursor: text !important;
    opacity: 1 !important;
}

.input-field:disabled,
.input-field[readonly] {
    pointer-events: none !important;
    cursor: not-allowed !important;
    opacity: 0.6 !important;
}

.input-field:focus {
    outline: none;
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

/* === MODEL SELECTOR DROPDOWN (IN INPUT) === */
.model-selector-dropdown {
    position: relative;
    flex-shrink: 0;
    z-index: 10002 !important;
    isolation: isolate;
}

/* Hide model selector dropdown on mobile and tablet */
@media (max-width: 1024px) {
    /* Hide in input section - use multiple selectors for maximum specificity */
    .input-section #chatModelSelector,
    .input-section .model-selector-dropdown,
    .input-container #chatModelSelector,
    .input-container .model-selector-dropdown,
    .input-box #chatModelSelector,
    .input-box .model-selector-dropdown,
    /* Hide by ID and class */
    #chatModelSelector,
    .model-selector-dropdown,
    /* Hide by attribute */
    #chatModelSelector[data-mobile-hidden],
    .model-selector-dropdown[data-mobile-hidden],
    #chatModelSelector[hidden],
    .model-selector-dropdown[hidden],
    /* Hide model-selector-large in welcome screen */
    .model-selector-large,
    #modelSelectorBtn,
    .input-box-large .model-selector-large,
    .input-actions .model-selector-large,
    .input-container-large .model-selector-large,
    #modelSelectorBtn[data-mobile-hidden],
    .model-selector-large[data-mobile-hidden] {
        display: none !important;
        visibility: hidden !important;
        opacity: 0 !important;
        width: 0 !important;
        height: 0 !important;
        min-width: 0 !important;
        max-width: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        overflow: hidden !important;
        pointer-events: none !important;
        position: absolute !important;
        left: -9999px !important;
        top: -9999px !important;
        flex: 0 0 0 !important;
        flex-shrink: 0 !important;
        flex-grow: 0 !important;
        flex-basis: 0 !important;
        order: 9999 !important;
        transform: scale(0) !important;
        clip-path: inset(100%) !important;
        clip: rect(0, 0, 0, 0) !important;
        -webkit-clip-path: inset(100%) !important;
        max-height: 0 !important;
        min-height: 0 !important;
    }
    
    /* Hide toggle button and menu (but NOT in .input-container-new) */
    #chatModelSelectorToggle:not(.model-btn-new),
    .model-selector-toggle,
    #chatModelSelectorMenu:not(.model-selector-menu-new),
    .model-selector-menu:not(.model-selector-menu-new),
    .input-section #chatModelSelectorToggle:not(.model-btn-new),
    .input-container #chatModelSelectorToggle:not(.model-btn-new),
    .input-box #chatModelSelectorToggle:not(.model-btn-new),
    .input-section #chatModelSelectorMenu:not(.model-selector-menu-new),
    .input-container #chatModelSelectorMenu:not(.model-selector-menu-new),
    .input-box #chatModelSelectorMenu:not(.model-selector-menu-new),
    #chatModelSelectorToggle[data-mobile-hidden],
    .model-selector-toggle[data-mobile-hidden],
    #chatModelSelectorMenu[data-mobile-hidden],
    .model-selector-menu[data-mobile-hidden] {
        display: none !important;
        visibility: hidden !important;
        opacity: 0 !important;
        width: 0 !important;
        height: 0 !important;
        min-width: 0 !important;
        max-width: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        pointer-events: none !important;
        position: absolute !important;
        left: -9999px !important;
        top: -9999px !important;
        transform: scale(0) !important;
        clip-path: inset(100%) !important;
        clip: rect(0, 0, 0, 0) !important;
        -webkit-clip-path: inset(100%) !important;
        max-height: 0 !important;
        min-height: 0 !important;
    }
    
    /* Ensure new model selector is visible and clickable in input-container-new */
    .input-container-new #chatModelSelectorToggle,
    .input-container-new .model-btn-new,
    .input-container-new #chatModelSelectorMenu,
    .input-container-new .model-selector-menu-new {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        pointer-events: auto !important;
        position: relative !important;
        left: auto !important;
        top: auto !important;
        width: auto !important;
        height: auto !important;
        min-width: auto !important;
        max-width: none !important;
        margin: 0 !important;
        padding: 8px 12px !important;
        transform: none !important;
        clip-path: none !important;
        clip: auto !important;
        -webkit-clip-path: none !important;
        max-height: none !important;
        min-height: auto !important;
        z-index: 10005 !important;
    }
    
    /* CRITICAL: Ensure button is always clickable */
    .input-container-new .model-btn-new,
    .input-container-new #chatModelSelectorToggle {
        z-index: 10005 !important;
        pointer-events: auto !important;
        cursor: pointer !important;
        position: relative !important;
    }
    
    /* CRITICAL FIX: Ensure model selector wrapper doesn't block clicks */
    .input-container-new .model-selector-wrapper-new {
        z-index: 10005 !important;
        pointer-events: auto !important;
        position: relative !important;
    }
    
    /* CRITICAL FIX: Ensure model selector menu is above everything */
    .input-container-new .model-selector-menu-new.active {
        z-index: 10006 !important;
        pointer-events: auto !important;
    }
    
    /* CRITICAL FIX: Prevent input field from blocking model selector */
    .input-container-new .input-field-new {
        z-index: 1 !important;
    }
    
    /* CRITICAL FIX: Ensure no element blocks model selector */
    .input-container-new > *:not(.model-selector-wrapper-new):not(.attach-dropdown-new) {
        z-index: auto !important;
    }
    
    .input-container-new #chatModelSelectorMenu {
        display: none !important; /* Hidden by default, shown when .active */
    }
    
    .input-container-new #chatModelSelectorMenu.active {
        display: block !important;
    }
    
    /* Remove gap for hidden element - use attribute selector */
    .input-box:has(#chatModelSelector[data-mobile-hidden]),
    .input-box:has(#chatModelSelector[hidden]),
    .input-box:has(#chatModelSelector[style*="display: none"]) {
        gap: var(--space-3);
    }
}

.model-selector-dropdown.active {
    z-index: 10002 !important;
}

.model-selector-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
    font-size: var(--text-xs);
    font-weight: 500;
    white-space: nowrap;
    touch-action: manipulation;
}

.model-selector-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.02);
}

.model-selector-toggle.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--bg-elevated);
}

.model-selector-toggle svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.model-selector-label {
    font-size: var(--text-xs);
    font-weight: 500;
}

.model-selector-menu {
    position: absolute;
    bottom: calc(100% + var(--space-2));
    left: 0;
    width: 240px;
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    display: none;
    z-index: 10003 !important;
    animation: slideUp 0.2s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
    pointer-events: auto !important;
}

[data-theme="dark"] .model-selector-menu {
    background: rgba(31, 31, 31, 0.95);
}

.model-selector-menu.active {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    z-index: 10004 !important;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.model-selector-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.model-selector-item:hover:not(.disabled) {
    background: var(--bg-hover);
}

.model-selector-item.active {
    background: var(--bg-elevated);
}

.model-selector-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.model-selector-item-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}

.model-selector-item-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.model-selector-item-desc {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.model-selector-check {
    color: var(--accent);
    opacity: 0;
    transition: opacity var(--transition-fast);
    flex-shrink: 0;
    margin-left: var(--space-2);
}

.model-selector-item.active .model-selector-check {
    opacity: 1;
}

/* === ATTACH DROPDOWN === */
.attach-dropdown {
    position: relative;
    flex-shrink: 0;
    z-index: 100;
}

.attach-dropdown-toggle {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
    position: relative;
}

.attach-dropdown-toggle:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.attach-dropdown-toggle:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.attach-dropdown-icon {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    transform-origin: center;
}

.attach-dropdown-toggle.active .attach-dropdown-icon {
    transform: rotate(45deg);
}

.attach-dropdown-menu {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08),
        0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    padding: 4px;
    min-width: 180px;
    max-width: 220px;
    width: auto;
    display: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.96);
    transition: 
        opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        visibility 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    overflow: hidden;
    z-index: 1000;
    box-sizing: border-box;
    flex-direction: column;
    gap: 2px;
}

.attach-dropdown-menu.active {
    display: flex;
    flex-direction: column;
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    gap: 2px;
}

.attach-dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--text-primary, #1a1a1a);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: -0.01em;
    text-align: left;
    cursor: pointer;
    border-radius: 8px;
    transition: 
        background-color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    user-select: none;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    white-space: nowrap;
    box-sizing: border-box;
    margin: 0;
    justify-content: flex-start;
}

.attach-dropdown-item.camera-hidden {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
    height: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    overflow: hidden !important;
}

.attach-dropdown-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.08) 0%, 
        rgba(168, 85, 247, 0.08) 100%);
    opacity: 0;
    transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.attach-dropdown-item:hover {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.1) 0%, 
        rgba(168, 85, 247, 0.1) 100%);
    color: var(--text-primary, #1a1a1a);
    transform: translateX(2px);
}

.attach-dropdown-item:hover::before {
    opacity: 1;
}

.attach-dropdown-item:active {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.15) 0%, 
        rgba(168, 85, 247, 0.15) 100%);
    transform: translateX(2px) scale(0.98);
}

.attach-dropdown-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    display: block;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.05));
}

.attach-dropdown-item:hover svg {
    transform: scale(1.1);
}

.attach-dropdown-item span {
    flex: 1;
    white-space: nowrap;
    position: relative;
    z-index: 1;
}

/* Dark theme support */
[data-theme="dark"] .attach-dropdown-menu,
.dark .attach-dropdown-menu {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

[data-theme="dark"] .attach-dropdown-item,
.dark .attach-dropdown-item {
    color: var(--text-primary, #ffffff);
}

[data-theme="dark"] .attach-dropdown-item::before,
.dark .attach-dropdown-item::before {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.12) 0%, 
        rgba(168, 85, 247, 0.12) 100%);
}

[data-theme="dark"] .attach-dropdown-item:hover,
.dark .attach-dropdown-item:hover {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.15) 0%, 
        rgba(168, 85, 247, 0.15) 100%);
}

[data-theme="dark"] .attach-dropdown-item:active,
.dark .attach-dropdown-item:active {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.2) 0%, 
        rgba(168, 85, 247, 0.2) 100%);
}

[data-theme="dark"] .attach-dropdown-item svg,
.dark .attach-dropdown-item svg {
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.3));
}

/* Legacy support - keep old classes for backward compatibility */
.attach-btn-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex-shrink: 0;
}

.attach-btn {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.attach-btn:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.attach-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.camera-btn {
    padding: var(--space-2);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.camera-btn:hover {
    color: var(--accent);
    background: var(--bg-hover);
    transform: scale(1.08);
}

.camera-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.send-btn {
    padding: var(--space-2);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(16, 163, 127, 0.3);
    touch-action: manipulation;
}

.send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(16, 163, 127, 0.4);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95) translateY(0);
    transition: transform 0.1s ease;
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* CRITICAL FIX: Stop button should always be enabled so user can cancel */
.send-btn.stop-btn,
.send-btn.stop-btn:disabled {
    opacity: 1 !important;
    cursor: pointer !important;
    pointer-events: auto !important;
}

.send-btn.stop-btn {
    background: #ef4444;
}

.send-btn.stop-btn:hover:not(:disabled) {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.input-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-2);
    padding: var(--space-2);
}

.input-note svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

/* AI Disclaimer in input-section (chat view) - better separation */
.input-section .ai-disclaimer {
    margin-top: var(--space-6);
    margin-bottom: 0;
    padding-top: var(--space-4);
}

/* AI Disclaimer - no border, no background, clear visibility */
.ai-disclaimer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-6);
    margin-bottom: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: transparent; /* No background */
    border-radius: var(--radius-lg);
    border: none; /* No border */
    box-shadow: none; /* No shadow */
    transition: color 0.3s ease;
    position: relative;
}

/* Visual separator line above AI disclaimer in chat view */
.input-section .ai-disclaimer::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--space-4));
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-light) 50%, transparent 100%);
}

.ai-disclaimer svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.ai-disclaimer span {
    line-height: 1.5;
    font-weight: 500; /* Make text slightly bolder for clarity */
}

/* === MODEL MENU === */
.model-menu {
    position: fixed;
    width: 280px;
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    display: none !important; /* Force hide by default */
    z-index: 2000;
    animation: slideDown 0.2s ease;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
}

.model-menu.active {
    display: block !important; /* Force show when active */
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.model-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.model-menu-item:hover:not(.disabled) {
    background: var(--bg-hover);
}

.model-menu-item.active {
    background: var(--bg-elevated);
}

.model-menu-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.model-menu-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.model-menu-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.model-menu-desc {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.model-menu-check {
    color: var(--accent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.model-menu-item.active .model-menu-check {
    opacity: 1;
}

/* === SIDEBAR OVERLAY === */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* === WELCOME MODAL === */
.welcome-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.welcome-modal.active {
    opacity: 1;
    visibility: visible;
}

.welcome-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.welcome-modal-dialog {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 520px;
    animation: welcomeModalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: auto !important;
}

@keyframes welcomeModalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.welcome-modal-content {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    padding: var(--space-8) var(--space-6);
    box-shadow: var(--shadow-xl);
    text-align: center;
    pointer-events: auto !important;
    position: relative;
    z-index: 2;
}

.welcome-modal-title {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.welcome-modal-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-8);
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

.welcome-modal-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.welcome-modal-btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    touch-action: manipulation;
    pointer-events: auto !important;
    position: relative;
    z-index: 10;
}

.welcome-modal-btn-primary {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.3);
}

.welcome-modal-btn-primary:hover {
    background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(48, 110, 140, 0.4);
}

.welcome-modal-btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.welcome-modal-btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.welcome-modal-btn-tertiary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.welcome-modal-btn-tertiary:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.welcome-modal-disclaimer {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    line-height: 1.5;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-subtle);
}

[data-theme="dark"] .welcome-modal-backdrop {
    background: rgba(0, 0, 0, 0.75);
}

[data-theme="dark"] .welcome-modal-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
}

/* === LINK CONFIRMATION MODAL === */
.link-confirmation-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.link-confirmation-modal.active {
    opacity: 1;
    visibility: visible;
}

.link-confirmation-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.link-confirmation-dialog {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 420px;
    animation: linkModalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes linkModalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.link-confirmation-content {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.link-confirmation-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(48, 110, 140, 0.1);
    border-radius: 50%;
}

.link-confirmation-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.link-confirmation-url {
    font-size: var(--text-sm);
    color: var(--accent);
    word-break: break-all;
    background: var(--bg-elevated);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    border: 1px solid var(--border-light);
    font-family: 'Courier New', monospace;
}

.link-confirmation-warning {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

.link-confirmation-actions {
    display: flex;
    gap: var(--space-3);
}

.link-confirmation-btn {
    flex: 1;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    touch-action: manipulation;
}

.link-confirmation-btn-cancel {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.link-confirmation-btn-cancel:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.link-confirmation-btn-confirm {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.3);
}

.link-confirmation-btn-confirm:hover {
    background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(48, 110, 140, 0.4);
}

[data-theme="dark"] .link-confirmation-backdrop {
    background: rgba(0, 0, 0, 0.75);
}

[data-theme="dark"] .link-confirmation-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
}

/* === MODAL === */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

/* Ensure profile dropdown is above settings modal on mobile */
@media (max-width: 1024px) {
    .profile-dropdown.active {
        z-index: 1000000 !important; /* Higher than modal (1000) */
    }
    
    /* Allow mobile model selector to be shown (controlled by JavaScript) */
    /* JavaScript will use inline styles with !important to override default display: none */
    .model-selector-header-mobile {
        /* Don't force hide here - let JavaScript control via inline styles */
    }
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
}

.modal-dialog {
    background: var(--bg-base);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 480px;
    z-index: 1001;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.modal.active .modal-dialog {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    touch-action: manipulation;
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-6);
    border-top: 1px solid var(--border-subtle);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(48, 110, 140, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.5;
}

.btn {
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(48, 110, 140, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--brand-secondary), var(--brand-primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(48, 110, 140, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.setting-group {
    margin-bottom: var(--space-8);
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    letter-spacing: 0.01em;
}

.theme-switcher {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.theme-option {
    padding: var(--space-5) var(--space-4);
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    transition: all var(--transition-base);
    touch-action: manipulation;
}

.theme-option:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.theme-option.active {
    background: var(--bg-elevated);
    border-color: var(--accent);
}

.theme-option svg {
    color: var(--accent);
}

.theme-option span {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.setting-action {
    width: 100%;
    padding: var(--space-4) var(--space-5);
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--text-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    touch-action: manipulation;
}

.setting-action:hover {
    background: var(--bg-hover);
    border-color: var(--border-medium);
}

.about-content {
    padding: var(--space-4);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
}

.about-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    font-size: var(--text-base);
}

.about-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

/* === SETTINGS PAGE === (Old - replaced by enhanced version below) */

.header-back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-right: var(--space-2);
}

.header-back-btn:hover {
    background: var(--bg-hover);
}

/* === SUBSCRIPTION PAGE === */
.subscription-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-4);
}

.subscription-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
    color: var(--text-secondary);
}

.subscription-plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.subscription-plan {
    background: var(--bg-elevated);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}

.subscription-plan:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.subscription-plan.current {
    border-color: var(--accent);
    background: var(--brand-gradient-subtle);
}

.plan-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.plan-name {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.plan-badge {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--accent);
    background: var(--bg-base);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    border: 1px solid var(--accent);
}

.plan-price {
    margin-bottom: var(--space-6);
}

.price-amount {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
}

.price-period {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-left: var(--space-1);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--space-6);
    flex: 1;
}

.plan-features li {
    padding: var(--space-2) 0;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.plan-features li::before {
    content: '✓';
    color: var(--accent);
    font-weight: 700;
    font-size: var(--text-base);
}

.plan-button {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    background: var(--brand-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    touch-action: manipulation;
}

.plan-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.plan-button:active {
    transform: translateY(0);
}

.about-desc:last-child {
    margin-bottom: 0;
}


/* === LOADING === */
.loading {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(12px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
    flex-direction: column;
    gap: var(--space-4);
    pointer-events: auto;
}

/* CRITICAL FIX: When loading overlay is NOT active, ensure it doesn't block input */
.loading:not(.active) {
    pointer-events: none !important;
    z-index: -1 !important;
}

.loading.active {
    display: flex;
    pointer-events: auto;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top-color: var(--accent);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Loading Error State */
.loading-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-6);
    max-width: 400px;
}

.loading-error svg {
    color: var(--error, #ef4444);
    margin-bottom: var(--space-4);
}

.loading-error h3 {
    margin: 0 0 var(--space-2) 0;
    color: var(--text-primary);
    font-size: var(--text-lg);
    font-weight: 600;
}

.loading-error p {
    margin: 0 0 var(--space-4) 0;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.5;
}

.btn-retry {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--brand-primary, var(--accent));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: var(--text-base);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-retry:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--brand-primary-hover, var(--accent));
}

.btn-retry:active {
    transform: translateY(0);
}

.btn-retry:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* === TOASTS === */
.toasts {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    pointer-events: none;
}

.toast {
    padding: var(--space-4) var(--space-5);
    background: var(--bg-base);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: var(--text-sm);
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    pointer-events: all;
    animation: toastSlideIn 0.3s ease;
    max-width: 320px;
    color: var(--text-primary);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left: 3px solid #10b981;
}

.toast.error {
    border-left: 3px solid #ef4444;
}

.toast.info {
    border-left: 3px solid var(--accent);
}

.toast.removing {
    animation: toastSlideOut 0.3s ease forwards;
}

@keyframes toastSlideOut {
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

/* === SCROLLBAR === */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--gray-600);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* === RESPONSIVE === */

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .messages {
        max-width: 900px;
    }
    
    .input-container-large,
    .input-container {
        max-width: 900px;
    }
    
}

/* Desktop (1024px - 1439px) */
@media (max-width: 1439px) {
    .messages {
        max-width: 768px;
    }
    
}

/* Tablet Landscape (1024px - 1279px) */
@media (max-width: 1279px) {
    .sidebar {
        width: 260px;
    }
    
    .header {
        padding: var(--space-4) var(--space-6);
    }
    
    .welcome-title {
        font-size: 2.5rem;
    }
    
    .welcome-icon {
        width: 150px;
        height: 150px;
    }
}

/* Tablet Portrait (768px - 1023px) */
@media (max-width: 1023px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 200;
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
        width: 280px;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .header {
        padding: var(--space-4) var(--space-5);
    }
    
    
    .welcome {
        padding: var(--space-6);
    }
    
    .welcome-content {
        gap: var(--space-5);
        max-width: 100%;
    }
    
    .welcome-title {
        font-size: 2.25rem;
    }
    
    .welcome-icon {
        width: 140px;
        height: 140px;
    }
    
    .input-container-large {
        max-width: 100%;
        padding: 0 var(--space-4);
    }
    
    .input-box-large {
        padding: var(--space-4);
    }
    
    .suggestions-horizontal {
        max-width: 100%;
        padding: 0 var(--space-4);
    }
    
    .model-menu {
        right: auto;
        left: auto;
        width: 280px;
        max-width: calc(100vw - 32px);
    }
}

/* Mobile Landscape (640px - 767px) */
@media (max-width: 767px) {
    html {
        font-size: 16px; /* Keep readable size */
    }
    
    .app-wrapper {
        height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    }
    
    .sidebar {
        padding-top: env(safe-area-inset-top, 0);
        padding-bottom: env(safe-area-inset-bottom, 0);
        height: calc(100vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0));
    }
    
    .header {
        padding: var(--space-4) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-4) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        padding-top: max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-top, 0)));
        min-height: 56px; /* Larger touch target */
    }
    
    .header-title {
        font-size: var(--text-lg);
    }
    
    .header-menu,
    .header-profile {
        width: auto !important;
        height: 44px !important;
        min-width: auto !important;
        min-height: 44px !important;
        padding: var(--space-2) var(--space-4) !important;
    }
    
    .header-profile .profile-text {
        font-size: var(--text-sm) !important;
        display: inline !important;
    }
    
    /* Make model selector header mobile smaller but touchable */
    .model-selector-header-mobile {
        padding: var(--space-2) var(--space-3) !important;
        min-width: auto !important;
        min-height: 36px !important;
        height: 36px !important;
        font-size: var(--text-sm) !important;
        gap: var(--space-2) !important;
        border-width: 1px !important;
        border-radius: var(--radius-lg) !important;
        box-shadow: var(--shadow-sm) !important;
    }
    
    .model-selector-header-mobile svg {
        width: 14px !important;
        height: 14px !important;
    }
    
    .welcome {
        padding: var(--space-6) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-6) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
    }
    
    .welcome-content {
        gap: var(--space-5);
        padding: 0 var(--space-3);
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .welcome-header {
        gap: var(--space-4);
    }
    
    .welcome-title {
        font-size: clamp(2rem, 8vw, 2.5rem);
        padding: 0 var(--space-3);
        line-height: 1.3;
    }
    
    .welcome-subtitle {
        font-size: clamp(var(--text-lg), 4.5vw, 1.5rem);
        padding: 0 var(--space-3);
        line-height: 1.6;
    }
    
    .welcome-icon {
        width: 180px;
        height: 180px;
        margin-bottom: var(--space-5);
    }
    
    .input-container-large {
        padding: 0 max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) 0 max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .input-box-large {
        padding: var(--space-4) var(--space-5);
        border-radius: var(--radius-2xl);
        width: 100%;
        box-sizing: border-box;
        min-height: 80px; /* Larger for easier interaction */
    }
    
    .input-field-large {
        font-size: 16px; /* Prevent zoom on iOS */
        min-height: 64px;
        width: 100%;
        box-sizing: border-box;
        line-height: 1.5;
        padding: var(--space-4) 0;
    }
    
    .input-actions {
        padding-top: 0;
        gap: var(--space-2);
    }
    
    .attach-dropdown-toggle-large {
        width: 56px !important;
        height: 56px !important;
        min-width: 56px !important;
        min-height: 56px !important;
        padding: var(--space-3) !important;
    }
    
    .attach-dropdown-toggle-large svg {
        width: 24px !important;
        height: 24px !important;
    }
    
    .model-selector-large {
        display: none !important;
        visibility: hidden !important;
        opacity: 0 !important;
        width: 0 !important;
        height: 0 !important;
        min-width: 0 !important;
        max-width: 0 !important;
        min-height: 0 !important;
        margin: 0 !important;
        padding: 0 !important;
        pointer-events: none !important;
        position: absolute !important;
        left: -9999px !important;
        top: -9999px !important;
        transform: scale(0) !important;
        clip-path: inset(100%) !important;
        clip: rect(0, 0, 0, 0) !important;
        -webkit-clip-path: inset(100%) !important;
        overflow: hidden !important;
    }
    
    .send-btn-large {
        width: 56px !important;
        height: 56px !important;
        min-width: 56px !important;
        min-height: 56px !important;
        padding: var(--space-3) !important;
    }
    
    .send-btn-large svg {
        width: 24px !important;
        height: 24px !important;
    }
    
    .suggestions-horizontal {
        grid-template-columns: 1fr;
        gap: var(--space-2);
        padding: 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-left, 0))) 0 max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-right, 0)));
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
    
    .suggestion-btn {
        padding: var(--space-4) var(--space-5);
        font-size: var(--text-base);
        min-height: 52px;
        border-radius: var(--radius-lg);
        font-weight: 500;
    }
    
    .message {
        padding: var(--space-4) var(--space-4);
        max-width: 92%;
        gap: var(--space-3);
        box-sizing: border-box;
    }
    
    .messages {
        padding: var(--space-5) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-5) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        max-width: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    
    .message-avatar {
        width: 36px;
        height: 36px;
        min-width: 36px;
        min-height: 36px;
    }
    
    .message-bubble {
        padding: var(--space-3) var(--space-4);
        word-wrap: break-word;
        overflow-wrap: break-word;
        max-width: 100%;
        font-size: var(--text-base);
        line-height: 1.6;
    }
    
    .input-section {
        padding: var(--space-4) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-bottom, 0))) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box {
        padding: var(--space-3) var(--space-4);
        width: 100%;
        box-sizing: border-box;
        min-height: 56px;
        border-radius: var(--radius-xl);
    }
    
    .send-btn {
        width: 48px !important;
        height: 48px !important;
        min-width: 48px !important;
        min-height: 48px !important;
    }
    
    .attach-dropdown-toggle {
        width: 48px !important;
        height: 48px !important;
        min-width: 48px !important;
        min-height: 48px !important;
    }
    
    .modal-dialog {
        width: calc(100% - var(--space-4));
        max-width: calc(100vw - var(--space-4) - env(safe-area-inset-left, 0) - env(safe-area-inset-right, 0));
        margin: var(--space-4);
        max-height: calc(90vh - env(safe-area-inset-top, 0) - env(safe-area-inset-bottom, 0) - var(--space-8));
        box-sizing: border-box;
    }
    
    .modal-header,
    .modal-body {
        padding: var(--space-4);
    }
}

/* Mobile Portrait (480px - 639px) */
@media (max-width: 639px) {
    .sidebar {
        width: 100%;
        max-width: 320px;
    }
    
    .header {
        padding: var(--space-4);
        min-height: 60px;
    }
    
    
    .header-left {
        gap: var(--space-3);
    }
    
    .header-menu {
        width: 44px !important;
        height: 44px !important;
        min-width: 44px !important;
        min-height: 44px !important;
    }
    
    .header-title {
        font-size: var(--text-lg);
    }
    
    .header-profile {
        width: auto !important;
        height: 44px !important;
        min-width: auto !important;
        min-height: 44px !important;
        padding: var(--space-2) var(--space-4) !important;
    }
    
    .header-profile .profile-text {
        font-size: var(--text-sm) !important;
        display: inline !important;
    }
    
    .welcome {
        padding: var(--space-5) var(--space-4);
    }
    
    .welcome-content {
        gap: var(--space-4);
    }
    
    .welcome-title {
        font-size: 2rem;
    }
    
    .welcome-subtitle {
        font-size: var(--text-base);
    }
    
    .welcome-icon {
        width: 160px;
        height: 160px;
    }
    
    .input-container-large {
        padding: 0 var(--space-2);
    }
    
    .input-box-large {
        padding: var(--space-4) var(--space-5);
        border-radius: var(--radius-xl);
        min-height: 72px;
    }
    
    .input-field-large {
        font-size: 16px; /* Prevent zoom on iOS */
        min-height: 64px;
        padding: var(--space-4) 0;
    }
    
    .input-actions {
        flex-direction: row;
        gap: var(--space-2);
        align-items: center;
    }
    
    .attach-dropdown-toggle-large {
        width: 56px !important;
        height: 56px !important;
        min-width: 56px !important;
        min-height: 56px !important;
    }
    
    .attach-dropdown-toggle-large svg {
        width: 24px !important;
        height: 24px !important;
    }
    
    .model-selector-large {
        display: none !important; /* Hide in input area on mobile */
    }
    
    .model-selector-header-mobile {
        /* Allow JavaScript to control visibility - don't force display here */
        padding: var(--space-2) var(--space-3) !important;
        min-width: auto !important;
        min-height: 36px !important;
        height: 36px !important;
        font-size: var(--text-sm) !important;
        gap: var(--space-2) !important;
    }
    
    .model-selector-header-mobile svg {
        width: 14px !important;
        height: 14px !important;
    }
    
    .header-left {
        gap: var(--space-2);
    }
    
    .header-title {
        font-size: clamp(14px, 4vw, 18px);
    }
    
    .send-btn-large {
        width: 56px !important;
        height: 56px !important;
        min-width: 56px !important;
        min-height: 56px !important;
    }
    
    .send-btn-large svg {
        width: 24px !important;
        height: 24px !important;
    }
    
    .suggestions-horizontal {
        padding: 0 var(--space-2);
    }
    
    .suggestion-btn {
        padding: var(--space-2) var(--space-3);
        justify-content: center;
    }
    
    .message {
        padding: var(--space-2) var(--space-3);
        max-width: 95%;
    }
    
    .message-avatar {
        width: 24px;
        height: 24px;
    }
    
    .message-bubble {
        padding: var(--space-2);
        font-size: var(--text-sm);
    }
    
    .input-section {
        padding: var(--space-2) var(--space-3);
    }
    
    .input-box {
        padding: var(--space-2);
    }
    
    .input-field {
        font-size: var(--text-sm);
    }
    
    .send-btn {
        width: 32px;
        height: 32px;
    }
    
    .btn-new {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .history-item {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .footer-link {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }
    
    .toasts {
        top: var(--space-4);
        right: var(--space-4);
        left: var(--space-4);
    }
    
    .toast {
        max-width: 100%;
    }
}

/* Small Mobile (320px - 479px) */
@media (max-width: 479px) {
    html {
        font-size: 15px; /* Keep readable */
    }
    
    .header {
        padding: var(--space-3) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-left, 0))) var(--space-3) max(var(--space-4), calc(var(--space-4) + env(safe-area-inset-right, 0)));
        padding-top: max(var(--space-3), calc(var(--space-3) + env(safe-area-inset-top, 0)));
        min-height: 56px;
    }
    
    .header-title {
        font-size: var(--text-base);
    }
    
    .header-menu {
        width: 44px !important;
        height: 44px !important;
        min-width: 44px !important;
        min-height: 44px !important;
    }
    
    .header-profile {
        width: auto !important;
        height: 44px !important;
        min-width: auto !important;
        min-height: 44px !important;
        padding: var(--space-2) var(--space-4) !important;
    }
    
    .header-profile .profile-text {
        font-size: var(--text-sm) !important;
        display: inline !important;
    }
    
    .welcome {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
    }
    
    .welcome-title {
        font-size: clamp(1.5rem, 5vw, 1.75rem);
        padding: 0 var(--space-2);
    }
    
    .welcome-subtitle {
        font-size: clamp(var(--text-sm), 3vw, var(--text-base));
    }
    
    .welcome-icon {
        width: 120px;
        height: 120px;
    }
    
    .input-container-large {
        padding: 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box-large {
        padding: var(--space-2);
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-field-large {
        min-height: 44px;
        font-size: 16px; /* Prevent zoom on iOS */
        width: 100%;
        box-sizing: border-box;
    }
    
    .send-btn-large {
        height: 44px;
        min-height: 44px;
    }
    
    .message {
        padding: var(--space-2);
        max-width: 98%;
        box-sizing: border-box;
    }
    
    .message-avatar {
        width: 20px;
        height: 20px;
        min-width: 20px;
        min-height: 20px;
    }
    
    .message-bubble {
        padding: var(--space-2);
        font-size: var(--text-xs);
        word-wrap: break-word;
        overflow-wrap: break-word;
        max-width: 100%;
    }
    
    .input-section {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-bottom, 0))) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .input-box {
        padding: var(--space-2);
        width: 100%;
        box-sizing: border-box;
    }
    
    .send-btn {
        width: 32px;
        height: 32px;
        min-width: 32px;
        min-height: 32px;
    }
    
    .suggestions-horizontal {
        padding: 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) 0 max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
    
    .suggestion-btn {
        padding: var(--space-2);
        font-size: var(--text-xs);
        min-height: 36px;
    }
    
    .messages {
        padding: var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-left, 0))) var(--space-2) max(var(--space-2), calc(var(--space-2) + env(safe-area-inset-right, 0)));
        width: 100%;
        box-sizing: border-box;
    }
}

/* Landscape Orientation */
@media (max-height: 600px) and (orientation: landscape) {
    .welcome {
        padding: var(--space-4);
        min-height: fit-content;
    }
    
    .welcome-content {
        gap: var(--space-4);
    }
    
    .welcome-icon {
        width: 130px;
        height: 130px;
        margin-bottom: 0;
    }
    
    .welcome-title {
        font-size: 1.75rem;
    }
    
    .welcome-subtitle {
        font-size: var(--text-sm);
    }
    
    .input-box-large {
        padding: var(--space-3);
    }
    
    .input-field-large {
        min-height: 40px;
    }
    
    .suggestions-horizontal {
        display: none;
    }
}

/* Welcome Modal Responsive */
@media (max-width: 639px) {
    .welcome-modal-content {
        padding: var(--space-6) var(--space-4);
    }
    
    .welcome-modal-title {
        font-size: var(--text-xl);
    }
    
    .welcome-modal-desc {
        font-size: var(--text-sm);
        margin-bottom: var(--space-6);
    }
    
    .welcome-modal-actions {
        gap: var(--space-2);
        margin-bottom: var(--space-4);
    }
    
    .welcome-modal-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
    }
    
    .welcome-modal-disclaimer {
        font-size: 0.625rem;
        margin-top: var(--space-4);
        padding-top: var(--space-4);
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    /* Mobile touch optimizations - larger touch targets (minimum 48px for easy tapping) */
    .btn-new,
    .history-item,
    .suggestion-btn,
    .send-btn,
    .send-btn-large,
    .attach-dropdown-toggle-large,
    .attach-dropdown-toggle,
    .model-selector-large,
    .header-menu,
    .sidebar-btn,
    .welcome-modal-btn {
        min-height: 48px !important;
        min-width: 48px !important;
    }
    
    .header-profile {
        min-height: 48px !important;
        min-width: auto !important;
        width: auto !important;
        padding: var(--space-2) var(--space-4) !important;
    }
    
    .header-profile .profile-text {
        font-size: var(--text-sm) !important;
        display: inline !important;
    }
    
    .message-actions {
        opacity: 1;
    }
    
    .btn-message-action {
        min-width: 44px !important;
        min-height: 44px !important;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .welcome-icon,
    .message-avatar,
    .logo-img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* === LOADING SKELETON ANIMATION === */
@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.skeleton-text {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* Profile Loading Spinner */
.profile-loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.profile-loading-spinner svg {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}

/* === CUSTOM CONTEXT MENU === */
.custom-context-menu {
    position: fixed;
    z-index: 10000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08),
        0 0 0 1px rgba(255, 255, 255, 0.5) inset,
        0 1px 0 rgba(255, 255, 255, 0.6) inset;
    padding: 6px;
    min-width: 200px;
    max-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.96) translateY(-8px);
    transition: 
        opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        visibility 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    overflow: hidden;
}

.custom-context-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.8) 50%, 
        transparent 100%);
    pointer-events: none;
}

.custom-context-menu.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
    pointer-events: auto;
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 14px;
    border: none;
    background: transparent;
    color: var(--text-primary, #1a1a1a);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: -0.01em;
    text-align: left;
    cursor: pointer;
    border-radius: 8px;
    transition: 
        background-color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    user-select: none;
    position: relative;
    overflow: hidden;
}

.context-menu-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.08) 0%, 
        rgba(168, 85, 247, 0.08) 100%);
    opacity: 0;
    transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.context-menu-item:hover {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.1) 0%, 
        rgba(168, 85, 247, 0.1) 100%);
    color: var(--text-primary, #1a1a1a);
    transform: translateX(2px);
}

.context-menu-item:hover::before {
    opacity: 1;
}

.context-menu-item:active {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.15) 0%, 
        rgba(168, 85, 247, 0.15) 100%);
    transform: translateX(2px) scale(0.98);
}

.context-menu-item.danger {
    color: var(--error-color, #ef4444);
}

.context-menu-item.danger::before {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.08) 0%, 
        rgba(220, 38, 38, 0.08) 100%);
}

.context-menu-item.danger:hover {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.12) 0%, 
        rgba(220, 38, 38, 0.12) 100%);
    color: var(--error-color, #ef4444);
}

.context-menu-item.danger:hover::before {
    opacity: 1;
}

.context-menu-item.danger:active {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.18) 0%, 
        rgba(220, 38, 38, 0.18) 100%);
}

.context-menu-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2.2;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.05));
}

.context-menu-item:hover .context-menu-icon {
    transform: scale(1.1);
}

.context-menu-item.danger .context-menu-icon {
    filter: drop-shadow(0 1px 1px rgba(239, 68, 68, 0.2));
}

.context-menu-label {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    z-index: 1;
}

.context-menu-separator {
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(0, 0, 0, 0.08) 20%, 
        rgba(0, 0, 0, 0.08) 80%, 
        transparent 100%);
    margin: 6px 8px;
    position: relative;
}

.context-menu-separator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0.6;
}

/* Dark theme support */
[data-theme="dark"] .custom-context-menu,
.dark .custom-context-menu {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset,
        0 1px 0 rgba(255, 255, 255, 0.1) inset;
}

[data-theme="dark"] .custom-context-menu::before,
.dark .custom-context-menu::before {
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.1) 50%, 
        transparent 100%);
}

[data-theme="dark"] .context-menu-item,
.dark .context-menu-item {
    color: var(--text-primary, #ffffff);
}

[data-theme="dark"] .context-menu-item::before,
.dark .context-menu-item::before {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.12) 0%, 
        rgba(168, 85, 247, 0.12) 100%);
}

[data-theme="dark"] .context-menu-item:hover,
.dark .context-menu-item:hover {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.15) 0%, 
        rgba(168, 85, 247, 0.15) 100%);
}

[data-theme="dark"] .context-menu-item:active,
.dark .context-menu-item:active {
    background: linear-gradient(135deg, 
        rgba(48, 110, 140, 0.2) 0%, 
        rgba(168, 85, 247, 0.2) 100%);
}

[data-theme="dark"] .context-menu-item.danger::before,
.dark .context-menu-item.danger::before {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.12) 0%, 
        rgba(220, 38, 38, 0.12) 100%);
}

[data-theme="dark"] .context-menu-item.danger:hover,
.dark .context-menu-item.danger:hover {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.18) 0%, 
        rgba(220, 38, 38, 0.18) 100%);
}

[data-theme="dark"] .context-menu-item.danger:active,
.dark .context-menu-item.danger:active {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.25) 0%, 
        rgba(220, 38, 38, 0.25) 100%);
}

[data-theme="dark"] .context-menu-separator,
.dark .context-menu-separator {
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.12) 20%, 
        rgba(255, 255, 255, 0.12) 80%, 
        transparent 100%);
}

[data-theme="dark"] .context-menu-separator::before,
.dark .context-menu-separator::before {
    background: rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .context-menu-icon,
.dark .context-menu-icon {
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.3));
}

[data-theme="dark"] .context-menu-item.danger .context-menu-icon,
.dark .context-menu-item.danger .context-menu-icon {
    filter: drop-shadow(0 1px 1px rgba(239, 68, 68, 0.4));
}

/* === Canvas Drawing Modal === */
.canvas-modal-dialog {
    max-width: 900px;
    width: 95%;
}

.canvas-modal-body {
    padding: var(--space-4);
}

.canvas-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    align-items: center;
    padding: var(--space-4);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.canvas-toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.canvas-toolbar-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.canvas-color-picker {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 2px;
    background: transparent;
}

.canvas-color-input {
    width: 80px;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-family: monospace;
    background: var(--bg-base);
    color: var(--text-primary);
}

.canvas-brush-slider {
    width: 120px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--border-light);
    outline: none;
    -webkit-appearance: none;
}

.canvas-brush-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.canvas-brush-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.canvas-brush-size-value {
    min-width: 45px;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
    text-align: center;
}


/* Mobile Responsive */
@media (max-width: 768px) {
    .canvas-modal-dialog {
        max-width: 100% !important;
        width: 100% !important;
        height: 100vh;
        margin: 0;
        border-radius: 0;
    }
    
    .canvas-workspace {
        flex-direction: column;
    }
    
    .canvas-code-panel {
        height: 50%;
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-light);
    }
    
    .canvas-preview-panel {
        height: 50%;
        min-height: auto;
    }
}

/* ===========================================
   MODERN UI OVERRIDES (v4.0) - Refined & Cool
   =========================================== */

:root {
    /* Refined Color Palette */
    --primary-gradient: linear-gradient(135deg, #306E8C 0%, #24556e 100%);
    --secondary-gradient: linear-gradient(135deg, #8CBF56 0%, #76a346 100%);
    --accent-gradient: linear-gradient(135deg, #306E8C, #8CBF56);
    
    /* Modern Shadows */
    --shadow-soft: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
    --shadow-float: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    
    /* Smooth Transitions */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
}

/* === Global Polish === */
body {
    background: radial-gradient(circle at top right, rgba(48, 110, 140, 0.03), transparent 40%),
                radial-gradient(circle at bottom left, rgba(140, 191, 86, 0.03), transparent 40%);
}

/* === Sidebar Refinement === */
.sidebar {
    border-right: none;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    box-shadow: 1px 0 20px rgba(0,0,0,0.02);
}

.history-item {
    border-radius: 12px;
    margin: 4px 8px;
    border: 1px solid transparent;
    transition: all 0.3s var(--ease-out-expo);
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    border-color: rgba(0,0,0,0.05);
    transform: translateY(-1px);
}

.history-item.active {
    background: linear-gradient(90deg, rgba(48, 110, 140, 0.08), transparent);
    border-left: 3px solid var(--brand-primary);
}

/* === Chat Area Polish === */
.chat-container {
    background: transparent;
}

.header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.03);
    box-shadow: 0 1px 10px rgba(0,0,0,0.02);
}

/* === Message Bubbles === */
.message {
    padding: 1rem;
    gap: 1rem;
}

.message-avatar {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border: 2px solid white;
}

/* AI Message */
.message.assistant .message-bubble {
    background: white;
    border: 1px solid rgba(0,0,0,0.04);
    border-radius: 20px 20px 20px 4px;
    padding: 1.5rem;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s var(--ease-out-expo);
}

.message.assistant .message-bubble:hover {
    box-shadow: var(--shadow-float);
    transform: translateY(-1px);
}

/* User Message */
.message.user .message-bubble {
    background: var(--primary-gradient);
    color: white;
    border-radius: 20px 20px 4px 20px;
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 15px rgba(48, 110, 140, 0.2);
    border: none;
}

.message.user .message-bubble p {
    color: white;
}

/* === Input Area Modernization === */
.input-section {
    background: transparent;
    padding-bottom: 2rem;
    pointer-events: none;
}

.input-container {
    pointer-events: auto;
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 24px;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.05), 
        0 10px 30px -5px rgba(0, 0, 0, 0.1),
        inset 0 1px 1px rgba(255, 255, 255, 0.8);
    padding: 0.75rem;
    transition: all 0.3s var(--ease-out-expo);
}

.input-container:focus-within {
    transform: translateY(-2px);
    box-shadow: 
        0 8px 12px -1px rgba(0, 0, 0, 0.05), 
        0 20px 40px -5px rgba(0, 0, 0, 0.15),
        inset 0 1px 1px rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(48, 110, 140, 0.2);
}

.input-box {
    border: none;
    background: transparent;
    box-shadow: none;
}

.input-field {
    font-size: 1.05rem;
    padding: 12px;
}

.send-btn {
    background: var(--accent-gradient);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.1) rotate(-10deg);
    box-shadow: 0 6px 20px rgba(48, 110, 140, 0.4);
}

/* === Dark Mode Adjustments === */
[data-theme="dark"] .sidebar {
    background: rgba(30, 30, 30, 0.8);
    border-right: 1px solid rgba(255,255,255,0.05);
}

[data-theme="dark"] .header {
    background: rgba(30, 30, 30, 0.8);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

[data-theme="dark"] .message.assistant .message-bubble {
    background: #2a2a2a;
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

[data-theme="dark"] .input-container {
    background: rgba(40, 40, 40, 0.8);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

[data-theme="dark"] .input-container:focus-within {
    background: rgba(45, 45, 45, 0.9);
    border-color: rgba(255,255,255,0.15);
}

/* === Animations === */
@keyframes smoothFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.welcome-icon img {
    animation: smoothFloat 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 20px rgba(48, 110, 140, 0.2));
}