/* ParadoxGPT - Minimalistic Black & White Theme */
:root {
    /* Clean Monochrome Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-sidebar: #ffffff;
    --bg-input: #ffffff;
    --bg-message-user: #f8f9fa;
    --bg-message-assistant: #ffffff;
    --bg-code: #f8f9fa;
    --bg-modal: rgba(0, 0, 0, 0.5);
    --bg-hover: #f5f5f5;

    /* Text Colors */
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-tertiary: #666666;
    --text-quaternary: #999999;
    --text-inverse: #ffffff;
    --text-code: #000000;
    --text-muted: #888888;

    /* Minimal Accent */
    --accent-primary: #000000;
    --accent-secondary: #333333;
    --accent-hover: #666666;
    --accent-error: #dc3545;
    --accent-success: #28a745;
    --border-color: #e0e0e0;
    --border-hover: #cccccc;
    --border-focus: #000000;

    /* Clean Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius - Minimal */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Smooth Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Glass Effects */
    --bg-glass: rgba(255, 255, 255, 0.8);
    --bg-glass-hover: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-border-hover: rgba(0, 0, 0, 0.2);
    --glass-backdrop: blur(10px);
    --glass-backdrop-strong: blur(20px);
    --glow-soft: 0 0 20px rgba(0, 0, 0, 0.1);
    --glow-primary: 0 0 20px rgba(0, 0, 0, 0.2);

    /* Enhanced Code Colors */
    --code-bg-primary: #f8f9fa;
    --code-bg-secondary: #ffffff;
    --code-border: #e9ecef;
    --code-text: #212529;
    --code-comment: #6c757d;
    --code-keyword: #0d6efd;
    --code-string: #198754;
    --code-number: #fd7e14;
    --code-function: #6f42c1;
    --code-variable: #d63384;
    --code-operator: #495057;
    --code-line-number: #adb5bd;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 0px;
    --input-max-height: 120px;
    --toggle-button-size: 40px;
}

/* Dark Mode Theme */
[data-theme="dark"] {
    /* Dark Background Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-sidebar: #0d1117;
    --bg-input: #21262d;
    --bg-message-user: #1c2128;
    --bg-message-assistant: #161b22;
    --bg-code: #161b22;
    --bg-modal: rgba(0, 0, 0, 0.8);
    --bg-hover: #21262d;

    /* Dark Text Colors */
    --text-primary: #f0f6fc;
    --text-secondary: #e6edf3;
    --text-tertiary: #7d8590;
    --text-quaternary: #656d76;
    --text-inverse: #0d1117;
    --text-code: #f0f6fc;
    --text-muted: #8b949e;

    /* Dark Accent Colors */
    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --accent-hover: #388bfd;
    --accent-error: #f85149;
    --accent-success: #3fb950;
    --border-color: #30363d;
    --border-hover: #484f58;
    --border-focus: #58a6ff;

    /* Dark Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.4);

    /* Dark Glass Effects */
    --bg-glass: rgba(0, 0, 0, 0.3);
    --bg-glass-hover: rgba(0, 0, 0, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(255, 255, 255, 0.2);
    --glass-backdrop: blur(10px);
    --glass-backdrop-strong: blur(20px);
    --glow-soft: 0 0 20px rgba(88, 166, 255, 0.1);
    --glow-primary: 0 0 20px rgba(88, 166, 255, 0.3);

    /* Dark Code Colors */
    --code-bg-primary: #161b22;
    --code-bg-secondary: #0d1117;
    --code-border: #30363d;
    --code-text: #f0f6fc;
    --code-comment: #8b949e;
    --code-keyword: #79c0ff;
    --code-string: #a5d6ff;
    --code-number: #79c0ff;
    --code-function: #d2a8ff;
    --code-variable: #ffa657;
    --code-operator: #f0f6fc;
    --code-line-number: #656d76;
}

/* Simple Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow: hidden;
    height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}



/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* Minimal Sidebar Toggle Button */
.sidebar-toggle {
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    width: var(--toggle-button-size);
    height: var(--toggle-button-size);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.sidebar-toggle:active {
    background: var(--bg-tertiary);
}

/* Toggle button visibility controlled by JavaScript */

/* Mobile Overlay for Sidebar */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

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

/* Enhanced Mobile Responsive adjustments */
@media (max-width: 768px) {
    .sidebar {
        width: 100vw;
        max-width: 320px;
        box-shadow: var(--shadow-xl);
    }

    .sidebar:not(.collapsed) ~ .main-content {
        margin-left: 0;
        width: 100%;
    }

    .sidebar-toggle {
        top: var(--spacing-md);
        left: var(--spacing-md);
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
        box-shadow: var(--shadow-md);
        z-index: 1001;
    }

    .sidebar-toggle:active {
        transform: scale(0.95);
    }

    .welcome-title {
        font-size: 2rem;
    }

    .welcome-features {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    /* Improve touch targets */
    .new-chat-btn {
        padding: var(--spacing-lg);
        font-size: 1rem;
        min-height: 48px;
    }

    .chat-history-item {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-md);
        min-height: 60px;
    }

    .login-btn,
    .logout-btn {
        padding: var(--spacing-md);
        min-height: 44px;
        min-width: 44px;
    }
}

/* Minimal Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform var(--transition-normal);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 999;
    transform: translateX(0);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px black solid;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
}

.new-chat-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.new-chat-btn:active {
    background: var(--bg-tertiary);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.chat-history::-webkit-scrollbar {
    width: 6px;
}

.chat-history::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.chat-history::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* Chat History Items */
.chat-history-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.chat-history-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.chat-history-item:active {
    background: var(--bg-tertiary);
}

.conversation-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    line-height: 1.3;
}

.conversation-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.conversation-preview {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.no-history {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    padding: var(--spacing-xl);
    font-style: italic;
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: 0.875rem;
    font-weight: 600;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    margin-left: 0;
    transition: margin-left var(--transition-normal);
}

.sidebar:not(.collapsed) ~ .main-content {
    margin-left: var(--sidebar-width);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* Welcome Section */
.welcome-section {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: var(--spacing-2xl);
}

.welcome-content {
    text-align: center;
    max-width: 500px;
}

.welcome-logo {
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    font-size: 3rem;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.welcome-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.5;
    font-weight: 400;
}

/* Message Styles */
.message {
    padding: var(--spacing-lg);
    margin: var(--spacing-md) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    max-width: none;
    transition: all var(--transition-normal);
    animation: slideUp 0.3s ease-out;
}

.message.user {
    background: var(--bg-message-user);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-left: auto;
    margin-right: var(--spacing-lg);
    max-width: 50%;
}

.message.assistant {
    background: var(--bg-message-assistant);
    margin-left: var(--spacing-lg);
    margin-right: auto;
    max-width: 80%;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.875rem;
    font-weight: 600;
}

.message.user .message-avatar {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.message-content {
    flex: 1;
    min-width: 0;
    position: relative;
}

.message-content p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
    color: var(--text-primary);
}

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

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.message-content h5,
.message-content h6 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.message-content ul,
.message-content ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.message-content li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.message-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    opacity: 0.8;
}

.message-footer small {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-weight: 500;
}

.message-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Chat Header */
.chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
    background: var(--bg-glass);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    position: sticky;
    top: 0;
    z-index: 100;
}

.chat-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.chat-action-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
}

.chat-action-btn:hover {
    background: var(--bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.chat-action-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.chat-action-btn i {
    font-size: 1rem;
}

.chat-action-btn span {
    font-weight: 500;
}

/* Success state for copy button */
.chat-action-btn.success {
    background: var(--accent-success) !important;
    color: white !important;
    border-color: var(--accent-success) !important;
}

/* Hide chat header when no messages */
.chat-container:not(:has(.message)) + .chat-header {
    display: none;
}

/* Responsive chat header */
@media (max-width: 768px) {
    .chat-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .chat-action-btn span {
        display: none;
    }

    .chat-action-btn {
        padding: var(--spacing-sm);
        min-width: 40px;
        justify-content: center;
    }
}

.message-action-btn {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    color: var(--text-tertiary);
    font-size: 0.875rem;
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.message-action-btn:hover {
    background: var(--bg-glass-hover);
    border-color: var(--glass-border-hover);
    color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Enhanced Code Blocks */
.message-content pre {
    background: var(--code-bg-primary);
    border: 1px solid var(--code-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--spacing-lg) 0;
    position: relative;
    box-shadow: var(--shadow-lg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    font-size: 0;
}

.message-content pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--code-keyword), var(--code-function), var(--code-string));
    z-index: 1;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--code-text);
    font-weight: 400;
    display: block;
    white-space: pre;
    overflow-x: auto;
    padding: 0;
    background: transparent;
}

.message-content p code {
    background: var(--code-bg-secondary);
    color: var(--code-keyword);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    border: 1px solid var(--code-border);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    display: inline;
    white-space: nowrap;
    font-weight: 500;
}

.code-block-container {
    position: relative;
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--code-bg-primary);
    border: 1px solid var(--code-border);
    box-shadow: var(--shadow-md);
}

.code-block-container pre {
    padding: var(--spacing-xl);
    margin: 0;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--code-border) transparent;
    background: transparent;
    border: none;
    box-shadow: none;
}

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

.code-block-container pre::-webkit-scrollbar-track {
    background: var(--code-bg-secondary);
    border-radius: var(--radius-sm);
}

.code-block-container pre::-webkit-scrollbar-thumb {
    background: var(--code-border);
    border-radius: var(--radius-sm);
    border: 2px solid var(--code-bg-secondary);
}

.code-block-container pre::-webkit-scrollbar-thumb:hover {
    background: var(--code-comment);
}

.code-controls {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 10;
}

.code-block-container:hover .code-controls {
    opacity: 1;
}

.code-controls button {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-md);
}

.code-controls button:hover {
    background: var(--bg-glass-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg), var(--glow-soft);
}

.preview-button {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary)) !important;
    color: var(--text-inverse) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: var(--shadow-lg), var(--glow-primary) !important;
}

.preview-button:hover {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary)) !important;
    transform: translateY(-2px) scale(1.05) !important;
    box-shadow: var(--shadow-xl), var(--glow-primary) !important;
}

.react-preview {
    background: linear-gradient(135deg, #61dafb, #21d4fd) !important;
    color: #20232a !important;
    border-color: #61dafb !important;
    box-shadow: var(--shadow-lg), 0 0 20px rgba(97, 218, 251, 0.3) !important;
}

.react-preview:hover {
    background: linear-gradient(135deg, #21d4fd, #61dafb) !important;
    transform: translateY(-2px) scale(1.05) !important;
    box-shadow: var(--shadow-xl), 0 0 25px rgba(97, 218, 251, 0.5) !important;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--bg-glass);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
    background: var(--bg-glass-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-xl), var(--glow-soft);
}

.theme-toggle:active {
    transform: translateY(0) scale(0.95);
}

.theme-toggle .icon {
    transition: all var(--transition-normal);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Theme transition for smooth switching */
*,
*::before,
*::after {
    transition: background-color var(--transition-normal),
                color var(--transition-normal),
                border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}

/* Ensure code blocks adapt to theme */
[data-theme="dark"] pre,
[data-theme="dark"] code {
    background-color: var(--code-bg-primary) !important;
    color: var(--code-text) !important;
    border-color: var(--code-border) !important;
}

/* Dark mode scrollbar */
[data-theme="dark"] ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 4px;
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Dark mode selection */
[data-theme="dark"] ::selection {
    background: rgba(88, 166, 255, 0.3);
    color: var(--text-primary);
}

/* Ensure modal backgrounds work in dark mode */
[data-theme="dark"] .modal {
    background: var(--bg-modal);
}

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

/* Dark mode for syntax highlighting */
[data-theme="dark"] .hljs {
    background: var(--code-bg-primary) !important;
    color: var(--code-text) !important;
}

[data-theme="dark"] .hljs-comment,
[data-theme="dark"] .hljs-quote {
    color: var(--code-comment) !important;
}

[data-theme="dark"] .hljs-keyword,
[data-theme="dark"] .hljs-selector-tag,
[data-theme="dark"] .hljs-built_in,
[data-theme="dark"] .hljs-name,
[data-theme="dark"] .hljs-tag {
    color: var(--code-keyword) !important;
}

[data-theme="dark"] .hljs-string,
[data-theme="dark"] .hljs-title,
[data-theme="dark"] .hljs-section,
[data-theme="dark"] .hljs-attribute,
[data-theme="dark"] .hljs-literal,
[data-theme="dark"] .hljs-template-tag,
[data-theme="dark"] .hljs-template-variable,
[data-theme="dark"] .hljs-type,
[data-theme="dark"] .hljs-addition {
    color: var(--code-string) !important;
}

[data-theme="dark"] .hljs-number,
[data-theme="dark"] .hljs-symbol,
[data-theme="dark"] .hljs-bullet,
[data-theme="dark"] .hljs-meta,
[data-theme="dark"] .hljs-selector-attr,
[data-theme="dark"] .hljs-selector-pseudo {
    color: var(--code-number) !important;
}

[data-theme="dark"] .hljs-function,
[data-theme="dark"] .hljs-class .hljs-title {
    color: var(--code-function) !important;
}

[data-theme="dark"] .hljs-variable,
[data-theme="dark"] .hljs-params {
    color: var(--code-variable) !important;
}

/* Responsive theme toggle */
@media (max-width: 768px) {
    .theme-toggle {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Ensure theme toggle is above other elements */
.theme-toggle {
    z-index: 1001;
}

/* Theme toggle animation */
.theme-toggle .icon {
    opacity: 1;
    transform: scale(1);
}

.theme-toggle .icon.fade-out {
    opacity: 0;
    transform: scale(0.8);
}

.theme-toggle .icon.fade-in {
    opacity: 1;
    transform: scale(1);
}

/* Enhanced Syntax Highlighting */
.hljs {
    background: var(--code-bg-primary) !important;
    color: var(--code-text) !important;
    padding: 0 !important;
    overflow-x: visible !important;
}

/* Keywords */
.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-link {
    color: var(--code-keyword) !important;
    font-weight: 600 !important;
}

/* Strings */
.hljs-string,
.hljs-title,
.hljs-name,
.hljs-type,
.hljs-attribute,
.hljs-symbol,
.hljs-bullet,
.hljs-addition,
.hljs-variable,
.hljs-template-tag,
.hljs-template-variable {
    color: var(--code-string) !important;
    font-weight: 500 !important;
}

/* Numbers */
.hljs-number,
.hljs-regexp,
.hljs-meta {
    color: var(--code-number) !important;
    font-weight: 500 !important;
}

/* Functions */
.hljs-function,
.hljs-title.function_,
.hljs-params {
    color: var(--code-function) !important;
    font-weight: 600 !important;
}

/* Variables and Properties */
.hljs-property,
.hljs-attr {
    color: var(--code-variable) !important;
    font-weight: 500 !important;
}

/* Comments */
.hljs-comment,
.hljs-quote {
    color: var(--code-comment) !important;
    font-style: italic !important;
    font-weight: 400 !important;
}

/* Operators */
.hljs-operator,
.hljs-punctuation {
    color: var(--code-operator) !important;
    font-weight: 500 !important;
}

/* Tags (HTML/XML) */
.hljs-tag {
    color: var(--code-keyword) !important;
    font-weight: 600 !important;
}

.hljs-tag .hljs-name {
    color: var(--code-function) !important;
    font-weight: 600 !important;
}

.hljs-tag .hljs-attr {
    color: var(--code-variable) !important;
    font-weight: 500 !important;
}

/* CSS Specific */
.hljs-selector-class,
.hljs-selector-id {
    color: var(--code-function) !important;
    font-weight: 600 !important;
}

.hljs-selector-pseudo {
    color: var(--code-variable) !important;
    font-weight: 500 !important;
}

/* JavaScript Specific */
.hljs-built_in,
.hljs-class {
    color: var(--code-keyword) !important;
    font-weight: 600 !important;
}

/* Line Numbers Enhancement */
.hljs-ln-numbers {
    color: var(--code-line-number) !important;
    border-right: 1px solid var(--code-border) !important;
    padding-right: var(--spacing-md) !important;
    margin-right: var(--spacing-md) !important;
    user-select: none !important;
    text-align: right !important;
    min-width: 2.5em !important;
}

/* Language-Specific Enhancements */
.code-block-container[data-language="javascript"] pre::before,
.code-block-container[data-language="js"] pre::before {
    background: linear-gradient(90deg, #f7df1e, #f0db4f) !important;
}

.code-block-container[data-language="python"] pre::before {
    background: linear-gradient(90deg, #3776ab, #ffd43b) !important;
}

.code-block-container[data-language="html"] pre::before {
    background: linear-gradient(90deg, #e34f26, #f06529) !important;
}

.code-block-container[data-language="css"] pre::before {
    background: linear-gradient(90deg, #1572b6, #33a9dc) !important;
}

.code-block-container[data-language="json"] pre::before {
    background: linear-gradient(90deg, #000000, #404040) !important;
}

.code-block-container[data-language="sql"] pre::before {
    background: linear-gradient(90deg, #336791, #4e8bb8) !important;
}

/* Code Block Header with Language Label */
.code-block-container::after {
    content: attr(data-language);
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-md);
    background: var(--code-bg-secondary);
    color: var(--code-comment);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid var(--code-border);
    z-index: 5;
    opacity: 0.8;
}

/* Improved Code Selection */
.message-content pre code::selection,
.message-content code::selection {
    background: rgba(13, 110, 253, 0.2) !important;
    color: inherit !important;
}

/* Better Focus States */
.code-block-container:focus-within {
    outline: 2px solid var(--code-keyword);
    outline-offset: 2px;
}

/* Enhanced Readability for Different Code Types */
.hljs-doctag,
.hljs-formula {
    color: var(--code-function) !important;
    background: rgba(111, 66, 193, 0.1) !important;
    padding: 0.1rem 0.3rem !important;
    border-radius: var(--radius-sm) !important;
}

.hljs-emphasis {
    font-style: italic !important;
    color: var(--code-variable) !important;
}

.hljs-strong {
    font-weight: bold !important;
    color: var(--code-keyword) !important;
}

/* Code Block Hover Effects */
.code-block-container:hover {
    box-shadow: var(--shadow-lg) !important;
    border-color: var(--code-comment) !important;
    transform: translateY(-1px);
    transition: all var(--transition-normal);
}

/* Responsive Code Blocks */
@media (max-width: 768px) {
    .code-block-container pre {
        padding: var(--spacing-md);
        font-size: 0.8rem;
    }

    .message-content code {
        font-size: 0.8rem;
    }

    .code-controls {
        position: static;
        opacity: 1;
        margin-top: var(--spacing-sm);
        justify-content: flex-end;
    }
}

/* Authentication Modal Styles */
.auth-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.auth-modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 400px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
    border: 1px solid var(--border-color);
}

.auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.auth-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.auth-close-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

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

.auth-body {
    padding: var(--spacing-xl);
}

.auth-error {
    background: #fee;
    color: var(--accent-error);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border: 1px solid #fcc;
    font-size: 0.875rem;
}

.auth-form {
    margin-bottom: var(--spacing-lg);
}

.auth-field {
    margin-bottom: var(--spacing-lg);
}

.auth-field label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-field input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: var(--bg-input);
    color: var(--text-primary);
}

.auth-field input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.auth-submit-btn {
    width: 100%;
    background: var(--accent-primary);
    color: var(--text-inverse);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.auth-submit-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.auth-submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.auth-divider {
    text-align: center;
    margin: var(--spacing-xl) 0;
    position: relative;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

.auth-divider span {
    background: var(--bg-primary);
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 2;
}

.google-signin-btn {
    width: 100%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.google-signin-btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.google-signin-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.google-signin-btn i {
    color: #4285f4;
}

.auth-switch {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.auth-switch-btn {
    background: none;
    border: none;
    color: var(--accent-primary);
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
    margin-left: var(--spacing-xs);
    transition: color var(--transition-normal);
}

.auth-switch-btn:hover {
    color: var(--accent-hover);
}

/* User Profile Section */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--accent-primary);
    color: var(--text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
}

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

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    color: var(--text-tertiary);
    margin: 0;
    font-size: 0.75rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.logout-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.logout-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Login Button in Header */
.login-btn {
    background: var(--accent-primary);
    color: var(--text-inverse);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.login-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Chat History Indicator */
.chat-history-indicator {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--accent-success);
    color: var(--text-inverse);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
}

.chat-history-indicator.show {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Auth Modal */
@media (max-width: 480px) {
    .auth-modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }

    .auth-header,
    .auth-body {
        padding: var(--spacing-lg);
    }
}

/* Input Section */
.input-section {
    flex-shrink: 0;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.input-container {
    max-width: 500px;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.input-wrapper:focus-within {
    border-color: var(--border-focus);
}

.message-input {
    flex: 1;
    background: none;
    border: 1px solid transparent;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.875rem;
    line-height: 3.5;
    resize: none;
    outline: none !important;
    max-height: var(--input-max-height);
    min-height: 20px;
    overflow-y: auto;
    padding: 0;
}

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

.message-input::-webkit-scrollbar {
    width: 4px;
}

.message-input::-webkit-scrollbar-track {
    background: transparent;
}

.message-input::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.send-btn {
    background: var(--accent-primary);
    border: none;
    color: var(--text-inverse);
    cursor: pointer;
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    width: 36px;
    height: 36px;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

.send-btn:disabled {
    background: var(--bg-tertiary);
    color: var(--text-quaternary);
    cursor: not-allowed;
}

.input-footer {
    margin-top: var(--spacing-sm);
    text-align: center;
}

.disclaimer {
    font-size: 0.75rem;
    color: var(--text-quaternary);
    line-height: 1.4;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.typing-dots {
    display: flex;
    gap: var(--spacing-xs);
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) {
    animation-delay: 0s;
}

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

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

/* Futuristic Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-modal);
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease-out;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
    background: var(--bg-glass);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-2xl), var(--glow-primary);
}

.loading-spinner {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-xl);
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 4px solid transparent;
    border-radius: var(--radius-full);
    animation: spin 2s linear infinite;
}

.spinner-ring:nth-child(1) {
    border-top: 4px solid var(--accent-primary);
    animation-duration: 2s;
}

.spinner-ring:nth-child(2) {
    border-right: 4px solid var(--accent-secondary);
    animation-duration: 1.5s;
    animation-direction: reverse;
}

.spinner-ring:nth-child(3) {
    border-bottom: 4px solid var(--accent-tertiary);
    animation-duration: 1s;
}

.loading-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Simple Animations */
@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInFromLeft {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Typewriter Effect */
.typewriter-cursor::after {
    content: '';
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: var(--accent-primary);
    margin-left: 2px;
    animation: blink 1.2s infinite;
    vertical-align: text-bottom;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* Smooth typing animation for message content */
.message.assistant .message-content {
    animation: none; /* Remove default animation during typing */
}

.message.assistant.typing {
    animation: none;
}

/* Code block typing effect */
.typing-code {
    border-left: 3px solid var(--accent-primary);
    padding-left: 10px;
    background: var(--bg-code);
    border-radius: var(--radius-sm);
}

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

/* HTML Preview Modal */
.preview-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-modal);
}

.preview-modal-content {
    background: var(--bg-primary);
    margin: 2% auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    height: 90%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.preview-title {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.preview-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.preview-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-size: 1rem;
}

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

.preview-body {
    flex: 1;
    overflow: hidden;
    position: relative;
}

#previewFrame {
    width: 100%;
    height: 100%;
    border: none;
    background-color: white;
    border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
}

.preview-modal.fullscreen {
    z-index: 1001;
}

.preview-modal.fullscreen .preview-modal-content {
    width: 100%;
    height: 100%;
    margin: 0;
    border-radius: 0;
}

.preview-modal.fullscreen .preview-header {
    border-radius: 0;
}

.preview-modal.fullscreen .preview-body,
.preview-modal.fullscreen #previewFrame {
    border-radius: 0;
}

/* Mobile Viewport Height Support */
@supports (height: 100dvh) {
    body {
        height: 100dvh;
    }

    .app-container {
        height: 100dvh;
    }
}

/* Enhanced Responsive Design */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 100vw;
        --spacing-mobile: 0.75rem;
    }

    body {
        font-size: 0.9rem;
    }

    .app-container {
        position: relative;
    }

    .sidebar {
        width: 100vw;
        max-width: 320px;
    }

    .main-content {
        width: 100%;
        margin-left: 0;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .welcome-title {
        font-size: 2rem;
        line-height: 1.1;
    }

    .welcome-section {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .message {
        margin: var(--spacing-md) var(--spacing-sm);
        max-width: 95%;
        padding: var(--spacing-md);
        /* Better text wrapping */
        word-wrap: break-word;
        overflow-wrap: break-word;
        hyphens: auto;
    }

    .message.user {
        max-width: 85%;
        margin-left: auto;
        margin-right: var(--spacing-sm);
    }

    .message.assistant {
        max-width: 95%;
        margin-left: var(--spacing-sm);
        margin-right: auto;
    }

    /* Better message content handling on mobile */
    .message-content {
        font-size: 0.9rem;
        line-height: 1.5;
    }

    .message-content p {
        margin-bottom: var(--spacing-md);
        /* Better text rendering on mobile */
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
    }

    .message-content h1,
    .message-content h2,
    .message-content h3,
    .message-content h4,
    .message-content h5,
    .message-content h6 {
        font-size: 1.1rem;
        line-height: 1.3;
        margin-bottom: var(--spacing-md);
    }

    .message-content ul,
    .message-content ol {
        padding-left: var(--spacing-lg);
        margin-bottom: var(--spacing-md);
    }

    .message-content li {
        margin-bottom: var(--spacing-xs);
        line-height: 1.4;
    }

    /* Better avatar sizing for mobile */
    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
        flex-shrink: 0;
    }

    .input-section {
        padding: var(--spacing-md);
        position: sticky;
        bottom: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        /* Ensure input section is above mobile keyboards */
        z-index: 100;
        /* Add safe area padding for devices with notches */
        padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    }

    .input-container {
        max-width: none;
        width: 100%;
    }

    .input-wrapper {
        padding: var(--spacing-sm) var(--spacing-md);
        /* Better touch target */
        min-height: 48px;
        align-items: center;
    }

    .message-input {
        font-size: 1rem;
        line-height: 1.4;
        /* Prevent zoom on iOS */
        font-size: max(1rem, 16px);
        /* Better mobile scrolling */
        -webkit-overflow-scrolling: touch;
        /* Improve touch responsiveness */
        touch-action: manipulation;
    }

    .send-btn {
        width: 44px;
        height: 44px;
        padding: var(--spacing-sm);
        /* Better touch target */
        min-width: 44px;
        min-height: 44px;
        /* Improve touch responsiveness */
        touch-action: manipulation;
    }

    /* Better input focus handling on mobile */
    .input-wrapper:focus-within {
        border-color: var(--border-focus);
        box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
    }

    .preview-modal-content {
        width: 95%;
        height: 95%;
        margin: 2.5% auto;
    }

    /* Better code block handling on mobile */
    .code-block-container {
        margin: var(--spacing-md) 0;
        border-radius: var(--radius-md);
        /* Prevent horizontal overflow */
        max-width: 100%;
        overflow: hidden;
    }

    .code-block-container pre {
        padding: var(--spacing-md);
        font-size: 0.8rem;
        line-height: 1.4;
        /* Better mobile scrolling */
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        /* Prevent text from being too small */
        min-font-size: 12px;
    }

    .code-block-container code {
        /* Better mobile code display */
        white-space: pre;
        word-wrap: normal;
        overflow-wrap: normal;
    }

    .code-controls {
        position: static;
        opacity: 1;
        margin-top: var(--spacing-sm);
        justify-content: flex-end;
        flex-wrap: wrap;
        gap: var(--spacing-xs);
        padding: 0 var(--spacing-md);
    }

    .code-controls button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
        min-height: 36px;
        min-width: 36px;
        /* Better touch targets */
        touch-action: manipulation;
    }

    /* Inline code improvements for mobile */
    .message-content p code {
        font-size: 0.8rem;
        padding: 0.15rem 0.4rem;
        /* Prevent line breaking in inline code */
        white-space: nowrap;
        /* But allow breaking if absolutely necessary */
        overflow-wrap: break-word;
    }

    /* Better table handling on mobile */
    .message-content table {
        width: 100%;
        overflow-x: auto;
        display: block;
        white-space: nowrap;
    }

    .message-content table thead,
    .message-content table tbody,
    .message-content table tr {
        display: table;
        width: 100%;
        table-layout: fixed;
    }

    .message-content table td,
    .message-content table th {
        padding: var(--spacing-xs);
        font-size: 0.8rem;
        /* Allow text wrapping in cells */
        white-space: normal;
        word-wrap: break-word;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-mobile-sm: 0.5rem;
    }

    body {
        font-size: 0.875rem;
    }

    .welcome-title {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-md);
    }

    .welcome-subtitle {
        font-size: 0.9rem;
    }

    .welcome-section {
        padding: var(--spacing-lg) var(--spacing-md);
        min-height: calc(100vh - 120px);
        min-height: calc(100dvh - 120px);
    }

    .sidebar {
        max-width: 280px;
    }

    .sidebar-toggle {
        width: 40px;
        height: 40px;
        top: var(--spacing-sm);
        left: var(--spacing-sm);
    }

    .message {
        padding: var(--spacing-sm) var(--spacing-md);
        margin: var(--spacing-sm);
        border-radius: var(--radius-md);
        /* Better spacing on small screens */
        gap: var(--spacing-sm);
    }

    .message.user {
        max-width: 90%;
        /* Better alignment on small screens */
        margin-left: 10%;
        margin-right: var(--spacing-sm);
    }

    .message.assistant {
        max-width: 98%;
        margin-left: var(--spacing-sm);
        margin-right: 2%;
    }

    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
        /* Ensure avatar doesn't shrink too much */
        min-width: 28px;
        min-height: 28px;
    }

    .message-content {
        font-size: 0.85rem;
        line-height: 1.5;
        /* Better text rendering on small screens */
        -webkit-text-size-adjust: 100%;
        text-size-adjust: 100%;
    }

    .message-content p {
        margin-bottom: var(--spacing-md);
        /* Better paragraph spacing */
        text-align: left;
    }

    .message-content h1,
    .message-content h2,
    .message-content h3 {
        font-size: 1rem;
        line-height: 1.3;
    }

    .message-content h4,
    .message-content h5,
    .message-content h6 {
        font-size: 0.9rem;
        line-height: 1.3;
    }

    /* Better list handling on small screens */
    .message-content ul,
    .message-content ol {
        padding-left: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .message-content li {
        font-size: 0.85rem;
        line-height: 1.4;
        margin-bottom: var(--spacing-xs);
    }

    /* Improve blockquote on small screens */
    .message-content blockquote {
        margin: var(--spacing-md) 0;
        padding: var(--spacing-sm) var(--spacing-md);
        border-left: 3px solid var(--border-color);
        background: var(--bg-secondary);
        font-size: 0.85rem;
        border-radius: var(--radius-sm);
    }

    .input-section {
        padding: var(--spacing-sm);
        /* Better safe area handling for small screens */
        padding-bottom: calc(var(--spacing-sm) + env(safe-area-inset-bottom));
        /* Ensure it stays above content */
        position: sticky;
        bottom: 0;
        z-index: 100;
    }

    .input-wrapper {
        padding: var(--spacing-xs) var(--spacing-sm);
        /* Ensure minimum touch target size */
        min-height: 44px;
    }

    .message-input {
        font-size: max(0.9rem, 16px); /* Prevent zoom on iOS */
        line-height: 1.3;
        /* Better mobile handling */
        -webkit-appearance: none;
        border-radius: var(--radius-md);
        /* Improve touch scrolling */
        -webkit-overflow-scrolling: touch;
    }

    .send-btn {
        width: 40px;
        height: 40px;
        font-size: 0.9rem;
        /* Ensure minimum touch target */
        min-width: 40px;
        min-height: 40px;
        /* Better touch response */
        touch-action: manipulation;
    }

    /* Improve input accessibility on small screens */
    .input-wrapper:focus-within {
        border-width: 2px;
        padding: calc(var(--spacing-xs) - 1px) calc(var(--spacing-sm) - 1px);
    }

    /* Better placeholder handling on small screens */
    .message-input::placeholder {
        font-size: 0.85rem;
        opacity: 0.7;
    }

    .disclaimer {
        font-size: 0.7rem;
        margin-top: var(--spacing-xs);
    }

    /* Optimize sidebar for small screens */
    .sidebar-header {
        padding: var(--spacing-md);
    }

    .new-chat-btn {
        padding: var(--spacing-md);
        font-size: 0.9rem;
    }

    .chat-history {
        padding: var(--spacing-sm);
    }

    .chat-history-item {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-sm);
    }

    .conversation-title {
        font-size: 0.8rem;
    }

    .conversation-time,
    .conversation-preview {
        font-size: 0.7rem;
    }

    .sidebar-footer {
        padding: var(--spacing-md);
        /* Ensure footer is always visible */
        position: relative;
        background: var(--bg-sidebar);
        border-top: 1px solid var(--border-color);
    }

    .user-profile {
        padding: var(--spacing-sm);
    }

    /* Ensure login section is visible and accessible on mobile */
    #loginSection {
        width: 100%;
        padding: var(--spacing-md);
        display: flex !important;
        justify-content: center;
        align-items: center;
    }

    #loginSection .login-btn {
        width: 100%;
        max-width: 200px;
        padding: var(--spacing-md);
        font-size: 0.9rem;
        font-weight: 600;
        justify-content: center;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
    }

    #loginSection .login-btn:active {
        transform: scale(0.98);
    }

    /* Mobile floating login button for better accessibility */
    .mobile-login-fab {
        position: fixed;
        bottom: 80px;
        right: var(--spacing-lg);
        width: 56px;
        height: 56px;
        background: var(--accent-primary);
        color: var(--text-inverse);
        border: none;
        border-radius: var(--radius-full);
        box-shadow: var(--shadow-xl);
        display: none;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        cursor: pointer;
        z-index: 1000;
        transition: all var(--transition-normal);
    }

    .mobile-login-fab:hover {
        background: var(--accent-hover);
        transform: scale(1.05);
    }

    .mobile-login-fab:active {
        transform: scale(0.95);
    }

    .mobile-login-fab.show {
        display: flex;
        animation: fadeIn 0.3s ease-out;
    }

    /* Mobile login prompt in welcome section */
    .mobile-login-prompt {
        display: none;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-lg);
        padding: var(--spacing-lg);
        margin-top: var(--spacing-xl);
        text-align: center;
    }

    .mobile-login-prompt h3 {
        margin: 0 0 var(--spacing-md) 0;
        font-size: 1rem;
        color: var(--text-primary);
    }

    .mobile-login-prompt p {
        margin: 0 0 var(--spacing-lg) 0;
        font-size: 0.875rem;
        color: var(--text-secondary);
    }

    .mobile-login-prompt .login-btn {
        width: auto;
        min-width: 120px;
    }

    .user-avatar {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }

    .user-name {
        font-size: 0.8rem;
    }

    .user-email {
        font-size: 0.7rem;
    }

    /* Better modal handling on small screens */
    .auth-modal-content {
        width: 95%;
        max-width: none;
        margin: 5% auto;
        border-radius: var(--radius-lg);
    }

    .auth-header,
    .auth-body {
        padding: var(--spacing-md);
    }

    .auth-header h2 {
        font-size: 1.25rem;
    }

    .preview-modal-content {
        width: 100%;
        height: 100%;
        margin: 0;
        border-radius: 0;
    }

    .preview-header {
        padding: var(--spacing-md);
    }

    .preview-title {
        font-size: 1rem;
    }

    .preview-btn {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
}

/* Mobile Keyboard Handling */
body.keyboard-open {
    height: 100vh;
    overflow: hidden;
}

body.keyboard-open .app-container {
    height: 100vh;
}

body.keyboard-open .chat-container {
    max-height: calc(100vh - 120px);
}

body.keyboard-open .input-section {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

/* Mobile Context Menu */
.mobile-context-menu {
    animation: fadeIn 0.2s ease-out;
}

.mobile-context-btn {
    transition: all 0.2s ease;
}

.mobile-context-btn:active {
    transform: scale(0.9);
    background: var(--bg-hover) !important;
}

/* Touch Improvements */
@media (hover: none) and (pointer: coarse) {
    /* Touch device specific styles */
    .message-action-btn,
    .code-controls button,
    .preview-btn,
    .new-chat-btn,
    .login-btn,
    .logout-btn,
    .auth-submit-btn,
    .google-signin-btn {
        min-height: 44px;
        min-width: 44px;
        /* Better touch response */
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }

    .sidebar-toggle {
        min-height: 44px;
        min-width: 44px;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }

    .send-btn {
        min-height: 44px;
        min-width: 44px;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }

    /* Remove hover effects on touch devices */
    .message-action-btn:hover,
    .code-controls button:hover,
    .preview-btn:hover,
    .sidebar-toggle:hover,
    .new-chat-btn:hover,
    .send-btn:hover {
        transform: none;
        box-shadow: var(--shadow-md);
    }

    /* Better touch feedback */
    .message-action-btn:active,
    .code-controls button:active,
    .preview-btn:active,
    .sidebar-toggle:active,
    .new-chat-btn:active,
    .send-btn:active {
        transform: scale(0.95);
        opacity: 0.8;
    }

    /* Improve text selection on touch devices */
    .message-content {
        -webkit-user-select: text;
        user-select: text;
        -webkit-touch-callout: default;
    }

    /* Better scrolling on touch devices */
    .chat-container,
    .chat-history,
    .code-block-container pre {
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
    }
}

/* Performance Optimizations for Mobile */
@media (max-width: 768px) {
    /* Reduce animations on mobile for better performance */
    * {
        animation-duration: 0.2s !important;
        transition-duration: 0.2s !important;
    }

    /* Optimize backdrop filters for mobile */
    .loading-overlay,
    .sidebar-overlay {
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }

    /* Optimize shadows for mobile */
    .sidebar,
    .code-block-container,
    .preview-modal-content {
        box-shadow: var(--shadow-md);
    }

    /* GPU acceleration for smooth animations */
    .sidebar,
    .sidebar-toggle,
    .message,
    .loading-overlay,
    .sidebar-overlay {
        transform: translateZ(0);
        -webkit-transform: translateZ(0);
        will-change: transform;
    }

    /* Optimize rendering */
    .message-content,
    .code-block-container,
    .input-wrapper {
        contain: layout style paint;
    }

    /* Reduce repaints */
    .chat-container {
        contain: layout;
    }

    /* Optimize scrolling performance */
    .chat-container,
    .chat-history {
        scroll-behavior: auto; /* Disable smooth scrolling on mobile for performance */
        -webkit-overflow-scrolling: touch;
        overflow-anchor: auto;
    }

    /* Optimize font rendering */
    body {
        text-rendering: optimizeSpeed;
        -webkit-font-smoothing: subpixel-antialiased;
    }

    /* Reduce complexity for mobile */
    .message-content pre::before {
        display: none; /* Remove gradient borders on mobile */
    }

    .code-block-container::after {
        display: none; /* Remove language labels on mobile */
    }

    /* Optimize images and media */
    img,
    video {
        max-width: 100%;
        height: auto;
        image-rendering: optimizeSpeed;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus Styles */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .input-section {
        display: none !important;
    }

    .main-content {
        margin: 0;
        padding: 0;
    }

    .message {
        break-inside: avoid;
        margin: 1rem 0;
        padding: 1rem;
        border: 1px solid #ccc;
        border-radius: 0.5rem;
    }
}