:root {
    /* Nature-Inspired Color Palette */
    --primary-color: #4a7c59;
    /* Sage Green */
    --primary-dark: #3a6346;
    --primary-light: #e8f5e9;

    --secondary-color: #8d6e63;
    /* Earthy Brown */
    --accent-color: #81c784;
    /* Fresh Leaf */

    /* Functional Colors */
    --bg-body: #f8f9fa;
    --bg-surface: #ffffff;
    --bg-sidebar: #ffffff;

    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #ffffff;

    --border-color: #e9ecef;

    /* Status Colors */
    --success: #2e7d32;
    --warning: #f57f17;
    --danger: #c62828;
    --info: #0288d1;

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing & Layout */
    --sidebar-width: 280px;
    --header-height: 70px;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    --bg-body: #0d1117;
    --bg-surface: #161b22;
    --bg-sidebar: #0d1117;
    --bg-card: #21262d;

    --text-primary: #e6edf3;
    --text-secondary: #8b949e;

    --border-color: #30363d;

    --primary-light: #1b3a29;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.6);
}

/* Dark mode component overrides */
[data-theme="dark"] .stat-card,
[data-theme="dark"] .card,
[data-theme="dark"] .section-container {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary);
}

[data-theme="dark"] .bg-light {
    background-color: var(--bg-surface) !important;
}

[data-theme="dark"] .bg-white {
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .border {
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .message-content {
    background-color: #2d333b;
    color: #e6edf3;
}

[data-theme="dark"] .message.bot .message-content {
    background-color: #2d333b;
    color: #e6edf3;
}

[data-theme="dark"] .message.user .message-content {
    background-color: var(--primary-color);
    color: white;
}

[data-theme="dark"] .input-container,
[data-theme="dark"] .chat-input {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .chat-input::placeholder {
    color: #8b949e;
    opacity: 1;
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-secondary);
}

[data-theme="dark"] .upload-zone {
    background-color: var(--bg-card);
    border-color: var(--border-color);
}

[data-theme="dark"] .tts-toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

[data-theme="dark"] .tts-toggle-btn:hover {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

[data-theme="dark"] pre {
    color: var(--text-primary);
}

[data-theme="dark"] .bg-soft-green {
    background-color: #1b3a29;
    color: #6ee7a0;
}

[data-theme="dark"] .bg-soft-blue {
    background-color: #1a3a5c;
    color: #58a6ff;
}

[data-theme="dark"] .bg-soft-orange {
    background-color: #3d2c1a;
    color: #f0883e;
}