:root, [data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --color-bg: #f7f6f2;
  --color-surface: #f9f8f5;
  --color-surface-2: #fbfbf9;
  --color-surface-offset: #efece6;
  --color-border: #d4d1ca;
  --color-divider: #dcd9d5;
  --color-text: #28251d;
  --color-text-muted: #6d6a63;
  --color-text-faint: #9b9992;
  --color-text-inverse: #f9f8f4;
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;
  --color-primary-highlight: #dce8e6;
  --color-gold: #c18b12;
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(40, 37, 29, 0.05);
  --shadow-md: 0 10px 30px rgba(40, 37, 29, 0.08);
  --shadow-lg: 0 24px 60px rgba(40, 37, 29, 0.12);
  --content-default: 1100px;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-display: 'Zodiak', Georgia, serif;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg: #171614;
  --color-surface: #1c1b19;
  --color-surface-2: #201f1d;
  --color-surface-offset: #242320;
  --color-border: #393836;
  --color-divider: #2a2927;
  --color-text: #d8d6d1;
  --color-text-muted: #aaa7a1;
  --color-text-faint: #7b7871;
  --color-text-inverse: #171614;
  --color-primary: #4f98a3;
  --color-primary-hover: #68aab3;
  --color-primary-highlight: #243235;
  --color-gold: #e0ad43;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: radial-gradient(circle at top right, color-mix(in srgb, var(--color-primary) 10%, transparent), transparent 28%), var(--color-bg);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), transform var(--transition-interactive);
}

a:hover { color: var(--color-primary); }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  z-index: 999;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.site-shell {
  width: min(calc(100% - 2rem), var(--content-default));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--color-bg) 84%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-text) 10%, transparent);
}

.header-row,
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-mark {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.8rem;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--color-primary-highlight), color-mix(in srgb, var(--color-gold) 18%, var(--color-surface)));
  border: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
}

.brand-mark svg {
  width: 1.55rem;
  height: 1.55rem;
}

.brand-copy small {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle,
.top-link {
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid color-mix(in srgb, var(--color-text) 10%, transparent);
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
}

.top-link {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.page-content {
  padding: var(--space-10) 0 var(--space-16);
}

.hero {
  display: grid;
  gap: var(--space-8);
  align-items: end;
  padding: clamp(var(--space-8), 10vw, var(--space-20)) var(--space-8) var(--space-12);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-8);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(0, 0, 0, 0.42) 0%,
    rgba(0, 0, 0, 0.28) 50%,
    rgba(0, 0, 0, 0.55) 100%
  );
  pointer-events: none;
  z-index: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  background: color-mix(in srgb, var(--color-primary) 8%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-primary) 12%, transparent);
  width: fit-content;
}

h1, h2 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  margin: 0;
}

h1 {
  font-size: clamp(2.6rem, 5vw, 5.6rem);
  max-width: 10ch;
}

.hero-copy h1 {
  color: #fff;
  text-shadow:
    0 1px 4px rgba(0, 0, 0, 0.55),
    0 2px 16px rgba(0, 0, 0, 0.35);
}

.hero .eyebrow {
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.28);
}

.hero .stat {
  border-top-color: rgba(255, 255, 255, 0.22);
}

.hero .stat strong {
  color: #fff;
}

.hero .stat span {
  color: rgba(255, 255, 255, 0.72);
}

h3 {
  margin: 0;
  font-size: var(--text-lg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr;
  gap: var(--space-8);
  position: relative;
  z-index: 1;
}

.hero-copy p,
.section-head p,
.card p {
  color: var(--color-text-muted);
}

.hero-copy p {
  margin: var(--space-5) 0 0;
  max-width: 60ch;
}

.hero-panel {
  padding: var(--space-6);
  background: linear-gradient(180deg, color-mix(in srgb, var(--color-surface-2) 92%, transparent), var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-text) 10%, transparent);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.stat {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.stat strong {
  display: block;
  font-size: var(--text-lg);
}

.stat span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.section-head p {
  margin: 0;
  max-width: 52ch;
}

.portal-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-5);
}

.card {
  grid-column: span 6;
  display: grid;
  gap: var(--space-5);
  padding: var(--space-6);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-text) 10%, transparent);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  min-height: 100%;
}

.card.featured {
  grid-column: span 12;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 7%, var(--color-surface)), var(--color-surface-2));
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-kicker {
  display: inline-flex;
  width: fit-content;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
}

.link-list {
  display: grid;
  gap: 0.8rem;
}

.link-item {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0.9rem 0;
  border-top: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
}

.link-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.link-item a {
  color: var(--color-text);
  font-weight: 500;
}

.link-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.link-cluster {
  display: grid;
  gap: 0.55rem;
}

.sub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
}

.sub-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.sub-links a::before {
  content: "↳ ";
  color: var(--color-primary);
}

.artifacts {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.artifact-list {
  display: grid;
  gap: var(--space-4);
}

.artifact-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
  border-radius: var(--radius-lg);
}

.artifact-index {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 700;
}

.artifact-item span,
.site-footer,
.footer-row a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.site-footer {
  padding: 0 0 var(--space-12);
}

@media (max-width: 900px) {
  .hero-grid,
  .card.featured {
    grid-template-columns: 1fr;
  }

  .card,
  .card.featured {
    grid-column: span 12;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-row,
  .section-head,
  .footer-row {
    align-items: start;
    flex-direction: column;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .artifact-item {
    grid-template-columns: auto 1fr;
  }

  .artifact-item span {
    grid-column: 2;
  }

  .page-content {
    padding-top: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* Theme-specific page backgrounds.
   Default (dark mode): show cirrus, hide map.
   Light mode: hide cirrus, show map. */
#cirrus-bg { display: block; }   /* dark-mode default */
#map-bg    { display: none; }    /* dark-mode default */

[data-theme="light"] #cirrus-bg { display: none; }
[data-theme="light"] #map-bg    { display: block; }