/* ═══════════════════════════════════════════════════════════════
   KOBALT RESEARCH — Design System v2
   Dual-theme (dark + light). Kobalt Software LLC brand palette.
   PRIMARY 01 · Celeste #22B7F5  · PRIMARY 02 · Purple #8B5CF6
   SUPPORT  · Magenta #E879F9 · Orange #FB923C
   ═══════════════════════════════════════════════════════════════ */

@import url("https://fonts.googleapis.com/css2?family=Sora:wght@200;300;400;500;600;700;800&family=Manrope:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap");

/* ─── DARK (default) ─────────────────────────────────────────── */
:root,
[data-theme="dark"] {
  color-scheme: dark;

  --bg-deep:        #0a0a0b;
  --bg-primary:     #0e0e10;
  --bg-secondary:   #131316;
  --bg-tertiary:    #1a1a1e;
  --bg-elevated:    #23232a;
  --bg-card:        rgba(26, 26, 30, 0.5);
  --bg-glass:       rgba(14, 14, 16, 0.80);
  --bg-hover:       rgba(245, 245, 240, 0.04);

  --accent:         #22B7F5;
  --accent-hover:   #4FC8F8;
  --accent-pressed: #0EA5E9;
  --accent-soft:    rgba(34, 183, 245, 0.12);
  --accent-softer:  rgba(34, 183, 245, 0.05);
  --accent-glow:    rgba(34, 183, 245, 0.30);
  --accent-ink:     #051821;

  --purple:         #8B5CF6;
  --purple-hover:   #A78BFA;
  --purple-pressed: #6D28D9;
  --purple-soft:    rgba(139, 92, 246, 0.12);
  --purple-softer:  rgba(139, 92, 246, 0.05);
  --purple-glow:    rgba(139, 92, 246, 0.28);
  --purple-ink:     #ffffff;

  --magenta:        #E879F9;
  --magenta-hover:  #F0ABFC;
  --magenta-soft:   rgba(232, 121, 249, 0.12);
  --magenta-glow:   rgba(232, 121, 249, 0.25);
  --magenta-ink:    #2A0A33;

  --orange:         #FB923C;
  --orange-hover:   #FDBA74;
  --orange-pressed: #EA580C;
  --orange-soft:    rgba(251, 146, 60, 0.12);
  --orange-glow:    rgba(251, 146, 60, 0.25);
  --orange-ink:     #2A1308;

  --danger:         #F43F5E;
  --danger-hover:   #FB7185;
  --danger-soft:    rgba(244, 63, 94, 0.12);
  --danger-glow:    rgba(244, 63, 94, 0.25);
  --danger-ink:     #ffffff;

  --success:        #2DD4BF;
  --success-hover:  #5EEAD4;
  --success-soft:   rgba(45, 212, 191, 0.12);
  --success-glow:   rgba(45, 212, 191, 0.25);
  --success-ink:    #03201D;

  --grad-primary:   linear-gradient(135deg, #22B7F5 0%, #8B5CF6 100%);
  --grad-secondary: linear-gradient(135deg, #8B5CF6 0%, #E879F9 100%);
  --grad-warm:      linear-gradient(135deg, #E879F9 0%, #FB923C 100%);
  --grad-cool:      linear-gradient(135deg, #22B7F5 0%, #8B5CF6 100%);
  --grad-brand:     linear-gradient(90deg, #22B7F5 0%, #8B5CF6 38%, #E879F9 70%, #FB923C 100%);
  --grad-border:    linear-gradient(135deg, #22B7F5, #8B5CF6 50%, #E879F9);

  --text-primary:   #f5f5f0;
  --text-secondary: #c7c7c1;
  --text-muted:     #8a8a84;
  --text-faint:     #5a5a56;
  --text-disabled:  #3a3a38;
  --text-on-accent: var(--accent-ink);

  --border-subtle:  rgba(245, 245, 240, 0.06);
  --border-default: rgba(245, 245, 240, 0.10);
  --border-hover:   rgba(245, 245, 240, 0.18);
  --border-active:  rgba(34, 183, 245, 0.45);

  --glow-accent:  0 0 0 1px rgba(34,183,245,.32), 0 0 40px rgba(34,183,245,.16), 0 0 80px rgba(139,92,246,.08);
  --glow-purple:  0 0 0 1px rgba(139,92,246,.32), 0 0 40px rgba(139,92,246,.16);
  --glow-magenta: 0 0 0 1px rgba(232,121,249,.32), 0 0 40px rgba(232,121,249,.16);
  --glow-orange:  0 0 0 1px rgba(251,146,60,.32),  0 0 40px rgba(251,146,60,.16);
  --glow-danger:  0 0 0 1px rgba(244,63,94,.32),   0 0 40px rgba(244,63,94,.16);
  --glow-soft:    0 12px 40px rgba(0,0,0,.55);

  --noise-opacity: 0.035;
}

/* ─── LIGHT ──────────────────────────────────────────────────── */
[data-theme="light"] {
  color-scheme: light;

  --bg-deep:        #f7f6f2;
  --bg-primary:     #ffffff;
  --bg-secondary:   #faf9f5;
  --bg-tertiary:    #f2f1ec;
  --bg-elevated:    #ffffff;
  --bg-card:        rgba(255, 255, 255, 0.70);
  --bg-glass:       rgba(255, 255, 255, 0.85);
  --bg-hover:       rgba(10, 10, 11, 0.03);

  --accent:         #0284C7;
  --accent-hover:   #0369A1;
  --accent-pressed: #075985;
  --accent-soft:    rgba(2, 132, 199, 0.10);
  --accent-softer:  rgba(2, 132, 199, 0.05);
  --accent-glow:    rgba(2, 132, 199, 0.22);
  --accent-ink:     #ffffff;

  --purple:         #7C3AED;
  --purple-hover:   #6D28D9;
  --purple-pressed: #5B21B6;
  --purple-soft:    rgba(124, 58, 237, 0.10);
  --purple-softer:  rgba(124, 58, 237, 0.05);
  --purple-glow:    rgba(124, 58, 237, 0.22);
  --purple-ink:     #ffffff;

  --magenta:        #C026D3;
  --magenta-hover:  #A21CAF;
  --magenta-soft:   rgba(192, 38, 211, 0.10);
  --magenta-glow:   rgba(192, 38, 211, 0.22);
  --magenta-ink:    #ffffff;

  --orange:         #EA580C;
  --orange-hover:   #C2410C;
  --orange-pressed: #9A3412;
  --orange-soft:    rgba(234, 88, 12, 0.10);
  --orange-glow:    rgba(234, 88, 12, 0.22);
  --orange-ink:     #ffffff;

  --danger:         #DC2626;
  --danger-hover:   #B91C1C;
  --danger-soft:    rgba(220, 38, 38, 0.10);
  --danger-glow:    rgba(220, 38, 38, 0.22);
  --danger-ink:     #ffffff;

  --success:        #0D9488;
  --success-hover:  #0F766E;
  --success-soft:   rgba(13, 148, 136, 0.10);
  --success-glow:   rgba(13, 148, 136, 0.22);
  --success-ink:    #ffffff;

  --grad-primary:   linear-gradient(135deg, #0284C7 0%, #7C3AED 100%);
  --grad-secondary: linear-gradient(135deg, #7C3AED 0%, #C026D3 100%);
  --grad-warm:      linear-gradient(135deg, #C026D3 0%, #EA580C 100%);
  --grad-cool:      linear-gradient(135deg, #0284C7 0%, #7C3AED 100%);
  --grad-brand:     linear-gradient(90deg, #0284C7 0%, #7C3AED 38%, #C026D3 70%, #EA580C 100%);
  --grad-border:    linear-gradient(135deg, #0284C7, #7C3AED 50%, #C026D3);

  --text-primary:   #0e0e10;
  --text-secondary: #3a3a38;
  --text-muted:     #6a6a62;
  --text-faint:     #9a9a92;
  --text-disabled:  #c8c7bf;
  --text-on-accent: #ffffff;

  --border-subtle:  rgba(10, 10, 11, 0.06);
  --border-default: rgba(10, 10, 11, 0.10);
  --border-hover:   rgba(10, 10, 11, 0.20);
  --border-active:  rgba(2, 132, 199, 0.45);

  --glow-accent:  0 0 0 1px rgba(2,132,199,.22),  0 8px 32px rgba(2,132,199,.16);
  --glow-purple:  0 0 0 1px rgba(124,58,237,.22), 0 8px 32px rgba(124,58,237,.16);
  --glow-magenta: 0 0 0 1px rgba(192,38,211,.22), 0 8px 32px rgba(192,38,211,.16);
  --glow-orange:  0 0 0 1px rgba(234,88,12,.22),  0 8px 32px rgba(234,88,12,.16);
  --glow-danger:  0 0 0 1px rgba(220,38,38,.22),  0 8px 32px rgba(220,38,38,.16);
  --glow-soft:    0 12px 32px rgba(10, 10, 11, 0.08);

  --noise-opacity: 0;
}

/* ─── Shared tokens ─────────────────────────────────────────── */
:root,
[data-theme] {
  --font-display: 'Sora', system-ui, sans-serif;
  --font-body:    'Manrope', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  --fs-xs:   0.72rem;
  --fs-sm:   0.8125rem;
  --fs-base: 0.9375rem;
  --fs-md:   1.0625rem;
  --fs-lg:   1.3125rem;
  --fs-xl:   1.75rem;
  --fs-2xl:  2.5rem;
  --fs-3xl:  3.75rem;
  --fs-4xl:  5.5rem;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-bounce:   cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:   180ms;
  --dur-normal: 360ms;
  --dur-slow:   720ms;

  --r-xs:  6px;
  --r-sm:  10px;
  --r-md:  14px;
  --r-lg:  20px;
  --r-xl:  28px;
  --r-full: 9999px;

  --s-1: 0.25rem; --s-2: 0.5rem;  --s-3: 0.75rem;
  --s-4: 1rem;    --s-5: 1.25rem; --s-6: 1.5rem;
  --s-8: 2rem;    --s-10: 2.5rem; --s-12: 3rem;
  --s-16: 4rem;   --s-20: 5rem;   --s-24: 6rem;

  --max-width: 1400px;
}

/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  background: var(--bg-deep);
}
body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--dur-normal), color var(--dur-normal);
}

/* ─── Typography ──────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}
h1 { font-size: clamp(2.6rem, 6vw, 5rem);  font-weight: 300; letter-spacing: -0.05em; }
h2 { font-size: clamp(1.9rem, 4.5vw, 3.4rem); font-weight: 300; letter-spacing: -0.04em; }
h3 { font-size: clamp(1.35rem, 3vw, 2rem);   font-weight: 400; }
h4 { font-size: 1.25rem; font-weight: 500; }
h5 { font-size: 1.05rem; font-weight: 600; }
h6 { font-size: 0.9rem;  font-weight: 600; letter-spacing: 0.01em; }

p { color: var(--text-secondary); line-height: 1.75; }
p strong { color: var(--text-primary); font-weight: 600; }
a { color: var(--accent); }

code, pre, .mono { font-family: var(--font-mono); }

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.grad-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ─── Ambient mesh ────────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% -10%, rgba(34,183,245,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 0%  100%, rgba(139,92,246,0.04) 0%, transparent 55%);
}
[data-theme="light"] body::before,
[data-theme="light"]::before {
  background:
    radial-gradient(ellipse 80% 60% at 70% -10%, rgba(2,132,199,0.04) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 0%  100%, rgba(124,58,237,0.03) 0%, transparent 55%);
}

/* ─── Noise overlay ───────────────────────────────────────────── */
.noise::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: var(--noise-opacity, 0.035);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* ─── Signature glow-border ───────────────────────────────────── */
.glow-border {
  position: relative;
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  transition:
    transform var(--dur-fast) var(--ease-out-expo),
    box-shadow var(--dur-normal);
}
.glow-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-border);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-normal) var(--ease-out-expo);
  pointer-events: none;
}
.glow-border:hover { transform: translateY(-3px); box-shadow: var(--glow-accent); }
.glow-border:hover::before { opacity: 1; }
.glow-border.purple:hover::before { background: var(--grad-secondary); }
.glow-border.warm:hover::before   { background: var(--grad-warm); }
.glow-border.purple:hover { box-shadow: var(--glow-purple); }
.glow-border.warm:hover   { box-shadow: var(--glow-orange); }

/* ─── Navigation ──────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--dur-normal), border-color var(--dur-normal);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  height: 62px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0;
  text-decoration: none;
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.60rem;
  letter-spacing: 0.24em;
  color: var(--accent);
  text-transform: uppercase;
  margin-left: 8px;
  font-weight: 500;
  padding: 2px 6px;
  background: var(--accent-softer);
  border: 1px solid rgba(34,183,245,.20);
  border-radius: 4px;
}
[data-theme="light"] .brand-tag {
  background: var(--accent-soft);
  border-color: rgba(2,132,199,.20);
}
.nav-links {
  display: flex;
  gap: 2px;
  align-items: center;
  margin-left: auto;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-decoration: none;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: var(--r-full);
  transition: color var(--dur-fast), background var(--dur-fast);
}
.nav-link:hover  { color: var(--text-primary); background: var(--bg-hover); }
.nav-link.active { color: var(--accent); background: var(--accent-softer); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

/* ─── Theme toggle ────────────────────────────────────────────── */
.theme-toggle {
  display: inline-flex;
  padding: 3px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-full);
  gap: 2px;
}
.theme-toggle button {
  width: 30px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--r-full);
  transition: all var(--dur-fast);
}
.theme-toggle button.active {
  background: var(--bg-primary);
  color: var(--accent);
  box-shadow: 0 2px 6px rgba(0,0,0,.12);
}
.theme-toggle svg { width: 14px; height: 14px; stroke-width: 2; }

@media (max-width: 780px) {
  .nav-links { display: none; }
}

/* ─── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 0.6rem 1.15rem;
  border-radius: var(--r-full);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease-out-expo);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: var(--accent-ink); font-weight: 600;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--accent-glow);
}
.btn-secondary {
  background: var(--purple); color: var(--purple-ink); font-weight: 600;
}
.btn-secondary:hover {
  background: var(--purple-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--purple-glow);
}
.btn-gradient {
  background: var(--grad-primary); color: #fff; font-weight: 600;
}
.btn-gradient:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--purple-glow), 0 0 22px var(--accent-glow);
  filter: brightness(1.06);
}
.btn-outline {
  background: transparent; color: var(--accent); border-color: var(--border-active);
}
.btn-outline:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-hover);
}
.btn-ghost {
  background: transparent; color: var(--text-secondary); border-color: var(--border-default);
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-hover);
}
.btn-icon {
  width: 36px; height: 36px; padding: 0;
  justify-content: center;
  border-radius: var(--r-sm);
  border-color: var(--border-default);
  background: transparent;
  color: var(--text-muted);
}
.btn-icon:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.btn-sm { padding: 0.38rem 0.85rem; font-size: 0.78rem; }
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1rem; font-weight: 600; }

/* ─── Badges ──────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  border-radius: var(--r-full);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid;
}
.badge-dot { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.badge-celeste { background: var(--accent-soft);  color: var(--accent);  border-color: rgba(34,183,245,.28); }
.badge-purple  { background: var(--purple-soft);  color: var(--purple);  border-color: rgba(139,92,246,.28); }
.badge-magenta { background: var(--magenta-soft); color: var(--magenta); border-color: rgba(232,121,249,.28); }
.badge-orange  { background: var(--orange-soft);  color: var(--orange);  border-color: rgba(251,146,60,.28); }
.badge-success { background: var(--success-soft); color: var(--success); border-color: rgba(45,212,191,.28); }
.badge-danger  { background: var(--danger-soft);  color: var(--danger);  border-color: rgba(244,63,94,.28); }
.badge-steel   { background: transparent; color: var(--text-muted); border-color: var(--border-default); }

/* Legacy pill aliases */
.pill {
  display: inline-flex; align-items: center;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}
.pill-accent  { background: var(--accent-soft);  color: var(--accent);  border: 1px solid rgba(34,183,245,.25); }
.pill-purple  { background: var(--purple-soft);  color: var(--purple);  border: 1px solid rgba(139,92,246,.25); }
.pill-orange  { background: var(--orange-soft);  color: var(--orange);  border: 1px solid rgba(251,146,60,.25); }
.pill-magenta { background: var(--magenta-soft); color: var(--magenta); border: 1px solid rgba(232,121,249,.25); }
.pill-success { background: var(--success-soft); color: var(--success); border: 1px solid rgba(45,212,191,.25); }

/* ─── Layout wrappers ─────────────────────────────────────────── */
.wrap        { position: relative; z-index: 1; max-width: 1280px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 48px); }
.wrap-wide   { position: relative; z-index: 1; max-width: var(--max-width); margin: 0 auto; padding: 0 clamp(20px, 5vw, 48px); }
.wrap-narrow { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 48px); }

/* ─── Hero ────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: clamp(130px, 18vw, 200px) 0 clamp(80px, 10vw, 130px);
  overflow: hidden;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero-eyebrow::before {
  content: '';
  width: 32px; height: 1px;
  background: linear-gradient(to right, transparent, var(--accent));
}
.hero h1 { margin-bottom: 28px; max-width: 1000px; }
.hero h1 em { color: var(--accent); font-style: italic; }
.hero h1 .purple-em { color: var(--purple); font-style: italic; }
.hero-sub {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 52px;
  font-weight: 400;
}
.hero-meta {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  text-transform: uppercase;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
  max-width: 1000px;
}
.hero-meta span { display: flex; align-items: center; gap: 8px; }
.hero-meta span::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  flex-shrink: 0;
}
.hero-meta span:nth-child(2)::before { background: var(--purple); box-shadow: 0 0 8px var(--purple-glow); }
.hero-meta span:nth-child(3)::before { background: var(--magenta); box-shadow: 0 0 8px var(--magenta-glow); }

/* ─── Page header (inner pages) ──────────────────────────────── */
.page-header {
  padding: clamp(100px, 14vw, 150px) 0 48px;
  position: relative; z-index: 1;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 32px;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color var(--dur-fast); }
.breadcrumb a:hover { color: var(--accent); }
.page-header h1 { margin-bottom: 22px; }
.page-header h1 em { color: var(--accent); font-style: italic; }
.page-header .lede {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 680px;
  font-weight: 400;
}
.meta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  color: var(--text-faint);
  text-transform: uppercase;
  align-items: center;
}

/* ─── Sections ────────────────────────────────────────────────── */
.section {
  position: relative;
  padding: clamp(72px, 9vw, 120px) 0;
  z-index: 1;
}
.section + .section { border-top: 1px solid var(--border-subtle); }
.section-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  display: inline-block;
}
.section-tag.purple  { color: var(--purple); }
.section-tag.orange  { color: var(--orange); }
.section-tag.magenta { color: var(--magenta); }
.section-tag.success { color: var(--success); }
.section h2 { margin-bottom: 24px; }
.section h2 em   { color: var(--accent);  font-style: italic; }
.section h2 .alt { color: var(--purple);  font-style: italic; }
.section h3 { font-size: 1.3rem; font-weight: 500; margin: 36px 0 14px; }
.section p  { margin-bottom: 18px; }

/* Content sections (inner pages) */
section.content { padding: 48px 0; border-top: 1px solid var(--border-subtle); position: relative; z-index: 1; }
section.content:first-of-type { border-top: none; }

/* ─── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 36px 32px;
  transition: transform var(--dur-fast) var(--ease-out-expo), border-color var(--dur-normal);
}
.card:hover { transform: translateY(-3px); border-color: var(--border-hover); }

/* ─── Formula block ───────────────────────────────────────────── */
.formula-block {
  margin: 28px 0;
  padding: 28px 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  text-align: center;
  overflow-x: auto;
}
.formula-block .ref {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  letter-spacing: 0.10em;
  margin-top: 14px;
}

/* ─── Epigraph ────────────────────────────────────────────────── */
.epigraph {
  margin: 48px 0 56px;
  padding: 32px 36px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
  text-align: center;
}
.epigraph .label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.20em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  display: block;
}
.epigraph .gloss {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 14px;
}
.epigraph p { margin-bottom: 0; color: var(--text-secondary); line-height: 1.7; }

/* ─── Callout ─────────────────────────────────────────────────── */
.callout {
  margin: 28px 0;
  padding: 24px 28px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-md);
}
.callout.accent  { border-left-color: var(--accent); }
.callout.purple  { border-left-color: var(--purple); }
.callout.success { border-left-color: var(--success); }
.callout.danger  { border-left-color: var(--danger); }
.callout-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--orange);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: block;
}
.callout.accent  .callout-label { color: var(--accent); }
.callout.purple  .callout-label { color: var(--purple); }
.callout.success .callout-label { color: var(--success); }
.callout.danger  .callout-label { color: var(--danger); }
.callout p { margin-bottom: 0; }

/* ─── Theorem ─────────────────────────────────────────────────── */
.theorem {
  margin: 28px 0;
  padding: 24px 28px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-top: 2px solid var(--accent);
  border-radius: var(--r-md);
}
.theorem-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: block;
}
.theorem h4 { font-size: 1.05rem; margin-bottom: 12px; font-weight: 600; }
.theorem p  { font-size: 0.95rem; margin-bottom: 10px; }
.theorem p:last-child { margin-bottom: 0; }

/* ─── Papers list ─────────────────────────────────────────────── */
.papers-list { display: flex; flex-direction: column; gap: 0; margin-top: 28px; }
.paper-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 20px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-subtle);
  text-decoration: none;
  color: inherit;
  transition: background var(--dur-fast), padding var(--dur-normal) var(--ease-out-expo);
  border-radius: var(--r-sm);
}
.paper-row:hover { background: rgba(255,255,255,0.025); padding-left: 14px; padding-right: 14px; }
.paper-row:hover h4 { color: var(--accent); }
.paper-row:hover .arrow { color: var(--accent); transform: translateX(6px); }
.paper-row .num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
  letter-spacing: 0.10em;
  padding-top: 6px;
}
.paper-row h4 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
  letter-spacing: -0.015em;
  transition: color var(--dur-fast);
}
.paper-row .paper-meta {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.10em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.paper-row p { font-size: 0.9rem; line-height: 1.65; color: var(--text-muted); margin-top: 8px; margin-bottom: 0; }
.paper-row .arrow {
  font-family: var(--font-mono);
  color: var(--text-faint);
  padding-top: 4px;
  transition: color var(--dur-fast), transform var(--dur-normal) var(--ease-out-expo);
}
@media (max-width: 600px) {
  .paper-row { grid-template-columns: 40px 1fr; gap: 14px; }
  .paper-row .arrow { display: none; }
}

/* ─── Layer sections (papers page) ───────────────────────────── */
.layer { padding: 48px 0; border-top: 1px solid var(--border-subtle); }
.layer:first-of-type { border-top: none; }
.layer-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.layer-tag.l1 { color: var(--accent); }
.layer-tag.l2 { color: var(--purple); }
.layer-tag.l3 { color: var(--orange); }
.layer-tag.l4 { color: var(--magenta); }
.layer-tag.l5 { color: var(--success); }
.layer h2 { margin-bottom: 12px; }
.layer-intro { color: var(--text-muted); font-size: 0.96rem; line-height: 1.7; margin-bottom: 8px; max-width: 680px; }

/* ─── Connection box ──────────────────────────────────────────── */
.connection-box {
  margin: 48px 0;
  padding: 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
}
.connection-box h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.connection-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 600px) { .connection-grid { grid-template-columns: 1fr; } }
.conn .conn-label { font-size: 0.85rem; color: var(--text-faint); font-style: italic; margin-bottom: 10px; }
.conn ul { list-style: none; margin: 0; }
.conn li { margin-bottom: 10px; }
.conn a {
  font-size: 0.96rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--border-hover);
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.conn a:hover { color: var(--accent); border-color: var(--accent); }

/* ─── Geometry cards ──────────────────────────────────────────── */
.geo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 28px 0; }
@media (max-width: 780px) { .geo-grid { grid-template-columns: 1fr; } }
.geo {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: 24px;
  position: relative;
  overflow: hidden;
}
.geo::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px; opacity: 0.8;
}
.geo.cooperation::before { background: linear-gradient(90deg, transparent, var(--accent), transparent); }
.geo.hierarchy::before   { background: linear-gradient(90deg, transparent, var(--orange), transparent); }
.geo.extraction::before  { background: linear-gradient(90deg, transparent, var(--danger), transparent); }
.geo .symbol { font-family: var(--font-mono); font-size: 1.3rem; margin-bottom: 10px; }
.geo.cooperation .symbol { color: var(--accent); }
.geo.hierarchy   .symbol { color: var(--orange); }
.geo.extraction  .symbol { color: var(--danger); }
.geo h4 { font-size: 1rem; margin-bottom: 8px; font-weight: 600; }
.geo .formula {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--bg-deep);
  border-radius: var(--r-sm);
}
.geo p { font-size: 0.88rem; line-height: 1.6; color: var(--text-muted); margin: 0; }

/* ─── Props table ─────────────────────────────────────────────── */
.props-table {
  margin: 24px 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  overflow: hidden;
}
.props-table table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.props-table th {
  background: var(--bg-tertiary);
  text-align: left;
  padding: 13px 18px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid var(--border-default);
}
.props-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: top;
  line-height: 1.6;
}
.props-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-primary);
  width: 32%;
}
.props-table tr:last-child td { border-bottom: none; }

/* ─── Summary bar ─────────────────────────────────────────────── */
.summary-bar {
  margin: 48px 0;
  padding: 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 780px) { .summary-bar { grid-template-columns: 1fr 1fr; } }
.summary-stat .stat-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.summary-stat .stat-value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}
.summary-stat .stat-meta { font-size: 0.85rem; color: var(--text-muted); }

/* ─── Movements grid ──────────────────────────────────────────── */
.movements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(18px, 2vw, 26px);
  margin-top: 56px;
}
@media (max-width: 880px) { .movements-grid { grid-template-columns: 1fr; } }
.movement {
  background: linear-gradient(180deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-normal) var(--ease-out-expo), border-color var(--dur-normal);
}
.movement:hover { transform: translateY(-4px); border-color: var(--border-hover); }
.movement::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--mv-accent, var(--accent)) 50%, transparent 100%);
  opacity: 0;
  transition: opacity var(--dur-normal);
}
.movement:hover::before { opacity: 0.7; }
.movement .mv-num {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: 5rem;
  line-height: 0.85;
  color: var(--mv-accent, var(--accent));
  opacity: 0.35;
  margin-bottom: 24px;
  letter-spacing: -0.04em;
}
.movement .mv-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.20em;
  color: var(--mv-accent, var(--accent));
  text-transform: uppercase;
  margin-bottom: 14px;
}
.movement h4 { font-size: 1.3rem; font-weight: 500; margin-bottom: 12px; }
.movement p  { font-size: 0.92rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── App cards ───────────────────────────────────────────────── */
.apps-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(18px, 2vw, 26px); margin-top: 48px; }
@media (max-width: 780px) { .apps-grid { grid-template-columns: 1fr; } }
.app-card {
  position: relative;
  display: block;
  padding: 44px 38px;
  background: linear-gradient(180deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform var(--dur-normal) var(--ease-out-expo), border-color var(--dur-normal);
}
.app-card:hover { transform: translateY(-4px); border-color: var(--border-hover); }
.app-card::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 100% 0%, var(--card-accent, var(--accent)) 0%, transparent 50%);
  opacity: 0.05;
  transition: opacity var(--dur-normal);
  pointer-events: none;
}
.app-card:hover::before { opacity: 0.10; }
.app-card .card-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.20em;
  color: var(--card-accent, var(--accent));
  text-transform: uppercase;
  margin-bottom: 16px;
}
.app-card h4 { font-size: clamp(1.4rem, 2.5vw, 1.8rem); font-weight: 400; margin-bottom: 14px; letter-spacing: -0.02em; }
.app-card h4 em { color: var(--card-accent, var(--accent)); font-style: italic; }
.app-card p   { font-size: 0.92rem; line-height: 1.65; color: var(--text-muted); margin-bottom: 22px; }
.app-card .card-cta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  color: var(--card-accent, var(--accent));
  text-transform: uppercase;
  display: flex; align-items: center; gap: 10px;
  transition: gap var(--dur-fast);
}
.app-card:hover .card-cta { gap: 16px; }

/* ─── Program cards ───────────────────────────────────────────── */
.programs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2vw, 22px); margin-top: 48px; }
@media (max-width: 880px) { .programs-grid { grid-template-columns: 1fr; } }
.program-card {
  display: block;
  padding: 34px 28px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur-normal) var(--ease-out-expo), border-color var(--dur-normal);
}
.program-card:hover { transform: translateY(-3px); border-color: var(--border-hover); }
.program-card .prog-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--prog-accent, var(--accent));
  text-transform: uppercase;
  margin-bottom: 14px;
}
.program-card h4 { font-size: 1.3rem; font-weight: 500; margin-bottom: 12px; letter-spacing: -0.01em; transition: color var(--dur-fast); }
.program-card:hover h4 { color: var(--prog-accent, var(--accent)); }
.program-card p  { font-size: 0.9rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── Phases ──────────────────────────────────────────────────── */
.phases { display: flex; flex-direction: column; gap: 16px; margin: 28px 0; }
.phase {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 600px) { .phase { grid-template-columns: 1fr; gap: 12px; } }
.phase-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.phase-num .phase-sub { display: block; color: var(--text-faint); margin-top: 4px; font-size: 0.62rem; }
.phase h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.phase p  { font-size: 0.92rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── Entity cards (health/research) ─────────────────────────── */
.entity {
  margin: 28px 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--dur-normal) var(--ease-out-expo), border-color var(--dur-normal);
}
.entity:hover { transform: translateY(-3px); border-color: var(--border-hover); }
.entity-head {
  padding: 22px 28px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.entity-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  width: 38px; height: 38px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.entity h3 { font-size: 1.25rem; margin: 0; }
.entity-body { padding: 26px 28px; }
.entity-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 18px; }
@media (max-width: 640px) { .entity-grid { grid-template-columns: 1fr; } }
.entity-cell h5 {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.entity-cell p { font-size: 0.92rem; line-height: 1.6; color: var(--text-muted); margin: 0; }
.entity-data {
  margin-top: 18px;
  padding: 12px 16px;
  background: var(--bg-deep);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
}
.entity-data .data-label { color: var(--accent); text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.62rem; margin-right: 8px; }
.data-available { color: var(--success); }
.data-partial   { color: var(--orange); }
.data-pending   { color: var(--text-faint); }

/* ─── Timeline ────────────────────────────────────────────────── */
.timeline { position: relative; padding-left: 36px; margin-top: 28px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 11px; top: 8px; bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), rgba(34,183,245,0.15));
}
.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px; top: 8px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-deep), 0 0 14px var(--accent-glow);
}
.timeline-item .year {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 500;
}
.timeline-item h4 { font-size: 1.15rem; font-weight: 500; margin-bottom: 10px; }
.timeline-item p  { font-size: 0.94rem; color: var(--text-muted); margin: 0; line-height: 1.65; }

/* ─── Split grid / meta stack ─────────────────────────────────── */
.split-grid { display: grid; grid-template-columns: 1fr 2fr; gap: clamp(40px, 6vw, 100px); align-items: start; }
@media (max-width: 880px) { .split-grid { grid-template-columns: 1fr; gap: 32px; } }
.meta-stack { display: flex; flex-direction: column; gap: 0; position: sticky; top: 80px; }
.meta-line {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  padding: 16px 0;
  border-top: 1px solid var(--border-subtle);
}
.meta-line:first-child { border-top: none; padding-top: 0; }
.meta-line .key {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.meta-line .val { color: var(--text-secondary); }
.meta-line a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-soft); }
.meta-line a:hover { border-color: var(--accent); }

/* ─── Big quote ───────────────────────────────────────────────── */
.big-quote { margin: clamp(40px, 5vw, 72px) 0; position: relative; }
.big-quote::before {
  content: '"';
  position: absolute;
  top: -40px; left: -20px;
  font-family: var(--font-display);
  font-size: 12rem;
  font-weight: 200;
  color: var(--accent);
  opacity: 0.08;
  line-height: 1;
  pointer-events: none;
}
.big-quote blockquote {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  position: relative; z-index: 1;
}
.big-quote blockquote em { color: var(--accent); font-style: italic; }
.big-quote cite {
  display: block;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-style: normal;
}

/* ─── Roles/groups ────────────────────────────────────────────── */
.roles-grid   { display: grid; grid-template-columns: 1fr 1fr;     gap: 16px; margin: 28px 0; }
.roles-grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin: 28px 0; }
@media (max-width: 780px) { .roles-grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .roles-grid { grid-template-columns: 1fr; } }
.role {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding: 22px 24px;
}
.role .role-num { font-family: var(--font-mono); font-size: 0.62rem; color: var(--accent); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 8px; }
.role h5 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.role p  { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin: 0; }

.groups-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin: 28px 0; }
@media (max-width: 900px) { .groups-grid { grid-template-columns: repeat(2, 1fr); } }
.group {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding: 18px 14px;
  text-align: center;
}
.group .region { font-family: var(--font-mono); font-size: 0.60rem; color: var(--accent); letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 10px; }
.group h5 { font-size: 0.92rem; font-weight: 600; margin-bottom: 8px; }
.group p  { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; margin: 0; }

/* ─── Outputs ─────────────────────────────────────────────────── */
.outputs { display: flex; flex-direction: column; gap: 14px; margin: 28px 0; }
.output {
  padding: 20px 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-md);
}
.output h5 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.output p  { font-size: 0.9rem; color: var(--text-muted); margin: 0; line-height: 1.6; }

/* ─── Metric cards (KUMPI) ────────────────────────────────────── */
.metrics-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 24px 0; }
@media (max-width: 640px) { .metrics-grid { grid-template-columns: 1fr; } }
.metric {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 24px;
}
.metric .m-symbol { font-family: var(--font-display); font-weight: 300; font-size: 2.2rem; color: var(--accent); margin-bottom: 10px; line-height: 1; }
.metric h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.metric .m-formula {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--bg-deep);
  border-radius: var(--r-sm);
  display: inline-block;
}
.metric p { font-size: 0.9rem; line-height: 1.6; color: var(--text-muted); margin: 0; }

/* ─── UD cards (KUMPI) ────────────────────────────────────────── */
.upstream-downstream { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0; }
@media (max-width: 640px) { .upstream-downstream { grid-template-columns: 1fr; } }
.ud-card {
  padding: 26px 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  border-top: 3px solid var(--accent);
}
.ud-card.upstream   { border-top-color: var(--purple); }
.ud-card.downstream { border-top-color: var(--accent); }
.ud-card .ud-label { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 12px; }
.ud-card.upstream  .ud-label { color: var(--purple); }
.ud-card.downstream .ud-label { color: var(--accent); }
.ud-card h4 { font-size: 1.1rem; font-weight: 500; margin-bottom: 10px; }
.ud-card p  { font-size: 0.9rem; color: var(--text-muted); margin: 0; line-height: 1.6; }

/* ─── About entity cards ──────────────────────────────────────── */
.entities-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 28px; }
@media (max-width: 640px) { .entities-grid { grid-template-columns: 1fr; } }
.entity-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  padding: 34px;
}
.entity-card .flag { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.22em; color: var(--accent); text-transform: uppercase; margin-bottom: 14px; }
.entity-card h4 { font-size: 1.5rem; font-weight: 400; margin-bottom: 8px; letter-spacing: -0.02em; }
.entity-card .location { font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.04em; color: var(--text-muted); margin-bottom: 18px; }
.entity-card p { font-size: 0.92rem; line-height: 1.65; color: var(--text-secondary); margin: 0; }

/* ─── Contact block ───────────────────────────────────────────── */
.contact-block {
  margin-top: 40px;
  padding: 48px;
  background: linear-gradient(135deg, rgba(34,183,245,0.05), rgba(139,92,246,0.03));
  border: 1px solid var(--border-default);
  border-radius: var(--r-xl);
  text-align: center;
}
@media (max-width: 600px) { .contact-block { padding: 32px; } }
.contact-block .contact-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.20em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 18px;
  display: block;
}
.contact-block .email {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.3rem, 2.5vw, 2rem);
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color var(--dur-fast);
  display: inline-block;
}
.contact-block .email:hover { color: var(--accent); }
.contact-block p { margin-top: 18px; font-size: 0.92rem; color: var(--text-muted); max-width: 520px; margin-left: auto; margin-right: auto; }

/* ─── List items ──────────────────────────────────────────────── */
section.content ul, .section ul {
  list-style: none;
  margin: 16px 0 22px;
}
section.content li, .section li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  color: var(--text-secondary);
}
section.content li::before, .section li::before {
  content: '';
  position: absolute;
  left: 8px; top: 12px;
  width: 5px; height: 1px;
  background: var(--accent);
}

/* ─── Connection cards (about) ────────────────────────────────── */
.connections-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 2vw, 26px); margin-top: 48px; }
@media (max-width: 880px) { .connections-grid { grid-template-columns: 1fr; } }
.connection-card {
  background: linear-gradient(180deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-normal) var(--ease-out-expo), border-color var(--dur-normal);
}
.connection-card:hover { transform: translateY(-3px); border-color: var(--border-hover); }
.connection-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--dur-normal);
}
.connection-card:hover::before { opacity: 1; }
.connection-card .cn-num { font-family: var(--font-display); font-weight: 300; font-size: 2.8rem; color: var(--accent); opacity: 0.45; line-height: 0.9; margin-bottom: 18px; letter-spacing: -0.02em; }
.connection-card h4 { font-size: 1.15rem; font-weight: 500; margin-bottom: 12px; letter-spacing: -0.01em; }
.connection-card p  { font-size: 0.92rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── Principles grid ─────────────────────────────────────────── */
.principles-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(16px, 2vw, 22px); margin-top: 28px; }
@media (max-width: 640px) { .principles-grid { grid-template-columns: 1fr; } }
.principle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  padding: 32px;
  transition: transform var(--dur-fast) var(--ease-out-expo), border-color var(--dur-normal);
}
.principle:hover { transform: translateY(-2px); border-color: var(--border-hover); }
.principle .pr-num { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.20em; color: var(--accent); text-transform: uppercase; margin-bottom: 14px; display: inline-block; }
.principle h4 { font-size: 1.15rem; font-weight: 500; margin-bottom: 12px; }
.principle p  { font-size: 0.92rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── Footer ──────────────────────────────────────────────────── */
footer {
  padding: clamp(48px, 6vw, 72px) 0 40px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-deep);
  position: relative;
  z-index: 1;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.10em;
  color: var(--text-faint);
  text-transform: uppercase;
}
footer a { color: var(--text-muted); text-decoration: none; transition: color var(--dur-fast); }
footer a:hover { color: var(--accent); }

/* ─── Reveal animation ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ─── Etymology note ─────────────────────────────────────────── */
.etymology {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: 20px;
  padding: 14px 18px;
  background: var(--bg-secondary);
  border-left: 2px solid var(--purple);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.etymology strong { color: var(--purple); font-weight: 600; }

/* ─── Comparison table (temporal-factor page) ────────────────── */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  overflow: hidden;
  font-size: 0.88rem;
}
.compare-table th {
  background: var(--bg-tertiary);
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  border-bottom: 1px solid var(--border-default);
  color: var(--text-muted);
}
.compare-table thead th:nth-child(2) { color: var(--danger); }
.compare-table thead th:nth-child(3) { color: var(--purple); }
.compare-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}
.compare-table td:first-child { color: var(--text-muted); font-family: var(--font-mono); }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .col-exp { color: var(--danger); font-family: var(--font-mono); }
.compare-table .col-log { color: var(--purple); font-family: var(--font-mono); }

/* ─── Geo compare cards (rawls-shannon page) ──────────────────── */
.geo-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 28px 0;
}
@media (max-width: 640px) { .geo-compare { grid-template-columns: 1fr; } }
.geo-card {
  padding: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
}
.geo-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
}
.geo-card.equal::before   { background: linear-gradient(90deg, transparent, var(--accent), transparent); }
.geo-card.unequal::before { background: linear-gradient(90deg, transparent, var(--orange), transparent); }
.geo-card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 10px; }
.geo-card.equal   h4 { color: var(--accent); }
.geo-card.unequal h4 { color: var(--orange); }
.geo-card p { font-size: 0.9rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ─── KaTeX override ──────────────────────────────────────────── */
.katex { font-size: 1.05em; color: var(--text-primary); }
.katex-display { overflow-x: auto; margin: 1.2em 0; }