/* ═══════════════════════════════════════════════════════════
   Vekna — Design Tokens
   ═══════════════════════════════════════════════════════════ */
:root {
  /* Colors */
  --navy-950: #0a1628;
  --navy-900: #0f172a;
  --navy-800: #1e293b;
  --navy-700: #334155;

  --teal-700: #0f766e;
  --teal-800: #115e59;
  --teal-600: #0d9488;
  --teal-500: #14b8a6;
  --teal-400: #2dd4bf;
  --teal-100: #ccfbf1;
  --teal-50: #f0fdfa;

  --gold-500: #d4a853;
  --gold-400: #e4bc6e;
  --gold-100: #fef9ec;

  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-muted: #e2e8f0;
  --surface: #ffffff;
  --surface-elevated: #ffffff;

  --text: var(--navy-900);
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #f8fafc;

  --primary: var(--teal-700);
  --primary-hover: #0d5f58;
  --primary-light: var(--teal-50);
  --primary-glow: rgba(15, 118, 110, 0.25);

  --accent: var(--gold-500);
  --accent-light: var(--gold-100);

  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --success: #059669;
  --warning: #d97706;
  --error: #dc2626;

  /* Typography — 2 fonts per language (body + display) */
  --font-en-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-en-display: 'DM Sans', 'Inter', system-ui, sans-serif;
  --font-fa-body: 'Vazirmatn', system-ui, Tahoma, sans-serif;
  --font-fa-display: 'Estedad', 'Vazirmatn', system-ui, sans-serif;

  /* Legacy aliases (body) */
  --font-en: var(--font-en-body);
  --font-fa: var(--font-fa-body);

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: clamp(1.75rem, 4vw, 2.25rem);
  --text-5xl: clamp(2rem, 5vw, 3rem);
  --heading-1: clamp(1.85rem, 4.5vw, 2.75rem);
  --heading-2: clamp(1.45rem, 3.2vw, 2rem);

  --leading-tight: 1.2;
  --leading-normal: 1.65;
  --leading-relaxed: 1.8;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-9: 2.25rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-14: 3.5rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow: 0 4px 24px rgba(15, 23, 42, 0.07);
  --shadow-md: 0 8px 32px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 40px var(--primary-glow);

  /* Layout */
  --container: min(1200px, 92vw);
  --header-h: 64px;
  --header-float-top: var(--space-2);
  --header-float-x: clamp(var(--space-3), 2vw, var(--space-5));
  --header-shell-h: calc(var(--header-h) + var(--header-float-top));
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition: 0.01ms;
    --transition-slow: 0.01ms;
  }
}

/* ── Dark mode ── */
[data-theme="dark"] {
  --bg: #0b1220;
  --bg-alt: #111827;
  --bg-muted: #1e293b;
  --surface: #151f32;
  --surface-elevated: #1a2740;

  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --primary: var(--teal-500);
  --primary-hover: var(--teal-400);
  --primary-light: rgba(20, 184, 166, 0.12);
  --primary-glow: rgba(45, 212, 191, 0.2);

  --border: #243044;
  --border-strong: #334155;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .site-header.scrolled .header-bar {
  background: rgba(11, 18, 32, 0.92);
  border-bottom-color: var(--border);
}

[data-theme="dark"] .site-header:not(.scrolled) .header-bar {
  border-color: rgba(148, 163, 184, 0.16);
}

[data-theme="dark"] .hero-bg-mesh {
  opacity: 0.35;
}

[data-theme="dark"] .band-dark {
  background: linear-gradient(135deg, #0a1628 0%, #111827 100%);
}

[data-theme="dark"] .data-table tr.highlight {
  background: rgba(20, 184, 166, 0.12);
}

[data-theme="dark"] .btn-ghost {
  color: var(--text);
  border-color: var(--border-strong);
}