/* ============================================================
   THEME SYSTEM - Light & Dark Mode Support
   ============================================================ */

/* Default Light Theme */
:root {
    /* Primary Colors */
    --primary-color: #1e3a8a;
    --secondary-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-elevated: #ffffff;
    --bg-hover: #f3f4f6;
    
    /* Gradient Colors for Body Background */
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    
    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --text-inverse: #ffffff;
    
    /* Border & Divider */
    --border-color: #d1d5db;
    --divider-color: #e5e7eb;
    
    /* Shadow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Classification Colors */
    --restricted-external: #7c3aed;
    --restricted-internal: #dc2626;
    --confidential-external: #ea580c;
    --confidential-internal: #f59e0b;
    --internal-use-only: #3b82f6;
    --public: #10b981;
    
    /* UI Components */
    --card-bg: #ffffff;
    --card-border: #e5e7eb;
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    --button-hover: rgba(59, 130, 246, 0.1);
    
    /* Toast Notifications */
    --toast-success-bg: #ecfdf5;
    --toast-success-border: #10b981;
    --toast-error-bg: #fef2f2;
    --toast-error-border: #ef4444;
    --toast-info-bg: #eff6ff;
    --toast-info-border: #3b82f6;
    --toast-warning-bg: #fffbeb;
    --toast-warning-border: #f59e0b;
}

/* Dark Theme */
[data-theme="dark"] {
    /* Primary Colors - Slightly muted for dark mode */
    --primary-color: #60a5fa;
    --secondary-color: #3b82f6;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    
    /* Background Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-elevated: #1e293b;
    --bg-hover: #334155;
    
    /* Gradient Colors for Body Background */
    --gradient-start: #1e293b;
    --gradient-end: #0f172a;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #e2e8f0;
    --text-tertiary: #cbd5e1;
    --text-inverse: #0f172a;
    
    /* Border & Divider */
    --border-color: #334155;
    --divider-color: #334155;
    
    /* Shadow - Darker for dark mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    
    /* Classification Colors - Brighter for dark mode */
    --restricted-external: #a78bfa;
    --restricted-internal: #f87171;
    --confidential-external: #fb923c;
    --confidential-internal: #fbbf24;
    --internal-use-only: #60a5fa;
    --public: #34d399;
    
    /* UI Components */
    --card-bg: #1e293b;
    --card-border: #334155;
    --input-bg: #0f172a;
    --input-border: #475569;
    --button-hover: rgba(96, 165, 250, 0.2);
    
    /* Toast Notifications */
    --toast-success-bg: #065f46;
    --toast-success-border: #34d399;
    --toast-error-bg: #991b1b;
    --toast-error-border: #f87171;
    --toast-info-bg: #1e40af;
    --toast-info-border: #60a5fa;
    --toast-warning-bg: #92400e;
    --toast-warning-border: #fbbf24;
}

/* Smooth theme transition */
* {
    transition: background-color 0.3s ease, 
                color 0.3s ease, 
                border-color 0.3s ease,
                box-shadow 0.3s ease;
}

/* Disable transitions for initial page load */
body.no-transition * {
    transition: none !important;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 10px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.theme-toggle-icon {
    font-size: 1.2em;
    transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-toggle-icon {
    transform: rotate(180deg);
}

.theme-toggle-text {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-primary);
}

/* Adjust body background */
body {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Apply theme to common elements */
.container {
    background: transparent;
}

.card {
    background: var(--card-bg);
    border-color: var(--card-border);
}

.header {
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border-color);
}

input, textarea, select {
    background: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-primary);
}

/* Dark mode specific adjustments */
[data-theme="dark"] .upload-area {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

[data-theme="dark"] .upload-area:hover {
    background: var(--bg-elevated);
    border-color: var(--primary-color);
}

[data-theme="dark"] .btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
}

[data-theme="dark"] .btn-primary:hover {
    opacity: 0.9;
}

/* Progress bar in dark mode */
[data-theme="dark"] .progress-bar {
    background: var(--bg-tertiary);
}

/* Footer in dark mode */
[data-theme="dark"] .footer {
    background: var(--bg-primary);
    border-top-color: var(--border-color);
    color: var(--text-secondary);
}