/* JourAI Learning Portal — Design Tokens */
:root {
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', Consolas, monospace;
  --font-display: 'Segoe UI', system-ui, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --nav-height: 118px;
  --max-width: 1280px;
  --content-width: 900px;

  --transition-fast: 150ms ease;
  --transition-base: 280ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.18);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.25);

  --z-nav: 1000;
  --z-modal: 2000;
  --z-search: 1500;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.9);
  --bg-hero: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 40%, #f5f3ff 100%);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --border-color: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.15);

  --accent-primary: #4f46e5;
  --accent-secondary: #7c3aed;
  --accent-tertiary: #0891b2;
  --accent-success: #059669;
  --accent-warning: #d97706;
  --accent-danger: #dc2626;

  --gradient-brand: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #0891b2 100%);
  --gradient-card: linear-gradient(145deg, rgba(79, 70, 229, 0.06) 0%, rgba(124, 58, 237, 0.04) 100%);
  --gradient-hero-overlay: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79, 70, 229, 0.12), transparent 70%);

  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --diagram-bg: #f1f5f9;
  --math-bg: rgba(79, 70, 229, 0.05);
}

[data-theme="dark"] {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2332;
  --bg-glass: rgba(17, 24, 39, 0.75);
  --bg-glass-strong: rgba(17, 24, 39, 0.92);
  --bg-hero: linear-gradient(135deg, #0a0e17 0%, #111827 50%, #0f172a 100%);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-color: rgba(148, 163, 184, 0.12);
  --border-strong: rgba(148, 163, 184, 0.22);

  --accent-primary: #818cf8;
  --accent-secondary: #a78bfa;
  --accent-tertiary: #22d3ee;
  --accent-success: #34d399;
  --accent-warning: #fbbf24;
  --accent-danger: #f87171;

  --gradient-brand: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #22d3ee 100%);
  --gradient-card: linear-gradient(145deg, rgba(129, 140, 248, 0.1) 0%, rgba(167, 139, 250, 0.06) 100%);
  --gradient-hero-overlay: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(129, 140, 248, 0.15), transparent 70%);

  --code-bg: #0d1117;
  --code-text: #c9d1d9;
  --diagram-bg: #1a2332;
  --math-bg: rgba(129, 140, 248, 0.08);
}