/* ============================================
   DESIGN TOKENS - LearnVaultX
   Midnight Blue Futuristic Theme System
   ============================================ */

:root {
    /* ============================================
       SPACING SCALE - 8px Grid System
       ============================================ */
    --space-0: 0;
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-8: 64px;
    --space-10: 80px;
    --space-12: 96px;
    --space-16: 128px;

    /* ============================================
       TYPOGRAPHY SYSTEM
       ============================================ */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;

    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 18px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 30px;
    --text-4xl: 36px;
    --text-5xl: 48px;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* ============================================
       BORDER RADIUS
       ============================================ */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* ============================================
       TRANSITIONS
       ============================================ */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 500ms ease;

    /* ============================================
       Z-INDEX SCALE
       ============================================ */
    --z-base: 1;
    --z-sidebar: 100;
    --z-header: 200;
    --z-dropdown: 300;
    --z-panel: 400;
    --z-modal: 500;
    --z-toast: 600;
    --z-tooltip: 700;

    /* ============================================
       LAYOUT DIMENSIONS
       ============================================ */
    --sidebar-width: 240px;
    --sidebar-collapsed: 60px;
    --panel-width: 400px;
    --header-height: 64px;
}

/* ============================================
   FUTURISTIC THEME - Midnight Blue + Neon Glows
   ============================================ */

[data-theme="futuristic"] {
    /* Backgrounds - Midnight Blue */
    --bg-primary: #0a0e27;
    --bg-secondary: #131829;
    --bg-tertiary: #1a1f3a;
    --bg-surface: #1e2337;

    /* Text Colors */
    --text-primary: #e5e7eb;
    --text-secondary: #cbd5e1;
    --text-tertiary: #9ca3af;
    --text-muted: #64748b;

    /* Brand Colors - Neon Blue/Cyan ONLY */
    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --secondary: #22d3ee;
    --secondary-hover: #06b6d4;
    --accent: #06b6d4;
    --accent-hover: #0891b2;

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Border Colors */
    --border-primary: rgba(96, 165, 250, 0.4);
    --border-secondary: rgba(96, 165, 250, 0.2);
    --border-focus: var(--primary);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.25);

    /* Glow Effects */
    --glow-primary: 0 0 14px rgba(96, 165, 250, 0.35);
    --glow-primary-strong: 0 0 20px rgba(96, 165, 250, 0.5);
    --glow-secondary: 0 0 14px rgba(34, 211, 238, 0.35);
    --glow-accent: 0 0 14px rgba(6, 182, 212, 0.35);

    /* Glassmorphism */
    --glass-bg: rgba(19, 24, 41, 0.65);
    --glass-border: rgba(96, 165, 250, 0.4);
    --glass-blur: 10px;
}

/* ============================================
   DARK THEME - Flat & Minimal
   ============================================ */

[data-theme="dark"] {
    --bg-primary: #0a0e27;
    --bg-secondary: #131829;
    --bg-tertiary: #1a1f3a;
    --bg-surface: #1e2337;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;

    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --secondary: #a78bfa;
    --secondary-hover: #8b5cf6;
    --accent: #06b6d4;
    --accent-hover: #0891b2;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    --border-primary: rgba(148, 163, 184, 0.1);
    --border-secondary: rgba(148, 163, 184, 0.05);
    --border-focus: var(--primary);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.25);

    --glow-primary: none;
    --glow-primary-strong: none;
    --glow-secondary: none;
    --glow-accent: none;

    --glass-bg: rgba(26, 31, 58, 0.7);
    --glass-border: rgba(148, 163, 184, 0.1);
    --glass-blur: 0px;
}

/* ============================================
   LIGHT THEME
   ============================================ */

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-surface: #ffffff;

    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;

    --primary: #0284c7;
    --primary-hover: #0369a1;
    --secondary: #7c3aed;
    --secondary-hover: #6d28d9;
    --accent: #0891b2;
    --accent-hover: #0e7490;

    --success: #059669;
    --warning: #d97706;
    --error: #dc2626;
    --info: #2563eb;

    --border-primary: rgba(15, 23, 42, 0.1);
    --border-secondary: rgba(15, 23, 42, 0.05);
    --border-focus: var(--primary);

    --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);

    --glow-primary: none;
    --glow-primary-strong: none;
    --glow-secondary: none;
    --glow-accent: none;

    --glass-bg: rgba(248, 250, 252, 0.8);
    --glass-border: rgba(15, 23, 42, 0.1);
    --glass-blur: 0px;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
}

.gradient-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.gradient-accent {
    background: linear-gradient(135deg, var(--accent), var(--primary));
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glow-primary {
    box-shadow: var(--glow-primary);
}

.glow-secondary {
    box-shadow: var(--glow-secondary);
}

/* ============================================
   FUTURISTIC MODE ENHANCEMENTS
   ============================================ */

[data-theme="futuristic"] .card,
[data-theme="futuristic"] .metric-card,
[data-theme="futuristic"] .feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    box-shadow: var(--glow-primary);
}

[data-theme="futuristic"] .btn-primary,
[data-theme="futuristic"] .btn-hero-primary {
    box-shadow: var(--glow-primary);
}

[data-theme="futuristic"] .btn-primary:hover,
[data-theme="futuristic"] .btn-hero-primary:hover {
    box-shadow: var(--glow-primary-strong);
}

[data-theme="futuristic"] input:focus,
[data-theme="futuristic"] textarea:focus,
[data-theme="futuristic"] select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2), var(--glow-primary);
}

[data-theme="futuristic"] .sidebar,
[data-theme="futuristic"] .left-zone {
    border-right: 1px solid var(--border-primary);
    box-shadow: 2px 0 20px rgba(96, 165, 250, 0.1);
}

[data-theme="futuristic"] #ai-panel,
[data-theme="futuristic"] #classAI,
[data-theme="futuristic"] .right-zone {
    border-left: 1px solid var(--border-primary);
    box-shadow: -2px 0 20px rgba(96, 165, 250, 0.1);
}

[data-theme="futuristic"] .progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    box-shadow: var(--glow-primary);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */

@media (max-width: 640px) {
    :root {
        --sidebar-width: 100%;
        --panel-width: 100%;
    }
}

@media (min-width: 641px) and (max-width: 1024px) {
    :root {
        --sidebar-width: 200px;
        --panel-width: 320px;
    }
}