: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);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 7rem);

  --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;
  --space-24: 6rem;
  --space-32: 8rem;

  --font-display: 'Zodiak', Georgia, serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  --color-bg: #f5f1e8;
  --color-surface: #fbf8f1;
  --color-surface-2: #fffdf8;
  --color-surface-offset: #ece5d7;
  --color-surface-offset-2: #ded3c1;
  --color-surface-dynamic: #d4c8b5;
  --color-divider: #d8cdbb;
  --color-border: #cfc1ac;
  --color-text: #251f18;
  --color-text-muted: #6f675d;
  --color-text-faint: #9c9285;
  --color-text-inverse: #fffaf0;
  --color-primary: #0f6b5d;
  --color-primary-hover: #0a5048;
  --color-primary-active: #073b36;
  --color-primary-highlight: #d7e7df;
  --color-rust: #914a27;
  --color-rust-highlight: #ead8c7;
  --color-steel: #36454c;
  --color-success: #437a22;
  --color-warning: #964219;
  --color-error: #a12c7b;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 2px oklch(0.22 0.025 65 / 0.08);
  --shadow-md:
    0 3px 10px oklch(0.22 0.025 65 / 0.08),
    0 14px 36px oklch(0.22 0.025 65 / 0.06);
  --shadow-lg:
    0 8px 20px oklch(0.22 0.025 65 / 0.1),
    0 24px 64px oklch(0.22 0.025 65 / 0.12);
  --content-narrow: 680px;
  --content-default: 980px;
  --content-wide: 1280px;
}

[data-theme='dark'] {
  --color-bg: #151412;
  --color-surface: #1d1b17;
  --color-surface-2: #24211c;
  --color-surface-offset: #2a251e;
  --color-surface-offset-2: #342d24;
  --color-surface-dynamic: #40372d;
  --color-divider: #332f29;
  --color-border: #4a4338;
  --color-text: #eee7dc;
  --color-text-muted: #b5aa9c;
  --color-text-faint: #7d746b;
  --color-text-inverse: #1a1712;
  --color-primary: #66b7a8;
  --color-primary-hover: #8bcdbf;
  --color-primary-active: #b0e2d8;
  --color-primary-highlight: #223b36;
  --color-rust: #d28758;
  --color-rust-highlight: #4b3428;
  --color-steel: #9aadb4;
  --color-success: #6daa45;
  --color-warning: #bb653b;
  --color-error: #d163a7;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.24);
  --shadow-md:
    0 4px 14px oklch(0 0 0 / 0.28),
    0 18px 42px oklch(0 0 0 / 0.2);
  --shadow-lg:
    0 8px 22px oklch(0 0 0 / 0.36),
    0 28px 72px oklch(0 0 0 / 0.28);
}

body {
  background:
    radial-gradient(circle at top left, color-mix(in oklab, var(--color-primary), transparent 86%), transparent 34rem),
    linear-gradient(180deg, var(--color-bg), var(--color-surface-offset));
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-primary-hover);
}

.skip-link {
  position: fixed;
  inset: var(--space-3) auto auto var(--space-3);
  z-index: 100;
  transform: translateY(-160%);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-3) clamp(var(--space-4), 4vw, var(--space-10));
  border-bottom: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  background: color-mix(in oklab, var(--color-bg), transparent 8%);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  gap: var(--space-3);
  align-items: center;
  color: var(--color-text);
  text-decoration: none;
  min-height: 44px;
}

.brand-mark {
  width: 44px;
  color: var(--color-primary);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
}

.brand small {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.top-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
}

.top-nav a,
.theme-toggle {
  min-height: 44px;
  border-radius: var(--radius-full);
}

.top-nav a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
}

.top-nav a:hover {
  background: color-mix(in oklab, var(--color-primary), transparent 90%);
  color: var(--color-text);
}

.theme-toggle {
  display: grid;
  width: 44px;
  place-items: center;
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.64fr);
  gap: clamp(var(--space-8), 6vw, var(--space-20));
  align-items: end;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-4), 5vw, var(--space-12)) var(--space-20);
}

.eyebrow,
.section-kicker,
.panel-label,
.toc-title {
  color: var(--color-rust);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 10ch;
  margin-block: var(--space-4) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  letter-spacing: -0.05em;
}

.hero-lede {
  max-width: 62ch;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.button.primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

.button.secondary {
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 82%);
  background: color-mix(in oklab, var(--color-surface), transparent 8%);
  color: var(--color-text);
}

.hero-panel {
  position: relative;
  overflow: hidden;
  padding: var(--space-6);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  border-radius: var(--radius-2xl);
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--color-primary), transparent 86%), transparent 42%),
    var(--color-surface);
  box-shadow: var(--shadow-lg);
}

.hero-panel::after {
  content: "";
  position: absolute;
  inset: auto -18% -22% auto;
  width: 65%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid color-mix(in oklab, var(--color-rust), transparent 62%);
}

.panel-top {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.panel-top strong {
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.1;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.stats-grid div {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: color-mix(in oklab, var(--color-surface-2), transparent 8%);
}

.stats-grid dt {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
}

.stats-grid dd {
  margin-top: var(--space-1);
  font-weight: 700;
}

.overview {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-12) clamp(var(--space-4), 5vw, var(--space-12));
}

.overview h2,
.page-gallery-section h2,
.reader-header h2 {
  margin-top: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  letter-spacing: -0.035em;
}

.overview-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.overview-grid article {
  min-height: 220px;
  padding: var(--space-6);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.overview-grid article:nth-child(1) {
  transform: translateY(var(--space-6));
}

.overview-grid article:nth-child(3) {
  transform: translateY(calc(var(--space-3) * -1));
}

.overview-grid span {
  color: var(--color-rust);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
}

.overview-grid h3 {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
}

.overview-grid p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
}

.workbook-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: clamp(var(--space-6), 4vw, var(--space-12));
  max-width: 1480px;
  margin: var(--space-20) auto 0;
  padding: 0 clamp(var(--space-4), 4vw, var(--space-8));
}

.toc-panel {
  position: relative;
}

.toc-inner {
  position: sticky;
  top: calc(var(--space-16) + var(--space-4));
  display: grid;
  gap: var(--space-6);
  max-height: calc(100dvh - var(--space-20));
  overflow: auto;
  padding: var(--space-5);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  border-radius: var(--radius-xl);
  background: color-mix(in oklab, var(--color-surface), transparent 4%);
}

.toc-inner nav {
  display: grid;
  gap: var(--space-1);
}

.toc-inner nav a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
}

.toc-inner nav a:hover {
  background: color-mix(in oklab, var(--color-primary), transparent 90%);
  color: var(--color-text);
}

.search-box {
  display: grid;
  gap: var(--space-2);
}

.search-box label {
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 700;
}

.search-box input,
.page-jump select {
  min-height: 44px;
  width: 100%;
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 82%);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  padding: var(--space-2) var(--space-3);
}

#search-status {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.reader {
  min-width: 0;
}

.reader-header {
  margin-bottom: var(--space-8);
  padding: var(--space-8);
  border-radius: var(--radius-2xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.reader-header p:last-child {
  max-width: 68ch;
  margin-top: var(--space-4);
  color: var(--color-text-muted);
}

.session-bar {
  position: sticky;
  top: 73px;
  z-index: 20;
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  margin-bottom: var(--space-6);
  padding: var(--space-3);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  border-radius: var(--radius-xl);
  background: color-mix(in oklab, var(--color-bg), transparent 10%);
  backdrop-filter: blur(16px);
}

.session-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-xs);
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.session-pill:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.document-content {
  padding: clamp(var(--space-5), 4vw, var(--space-10));
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  border-radius: var(--radius-2xl);
  background: var(--color-surface-2);
  box-shadow: var(--shadow-md);
}

.document-content > * + * {
  margin-top: var(--space-4);
}

.document-content h2,
.document-content h3,
.document-content h4 {
  color: var(--color-text);
}

.document-content h2 {
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  letter-spacing: -0.035em;
}

.document-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.document-content h3 {
  margin-top: var(--space-10);
  color: var(--color-primary);
  font-size: var(--text-xl);
}

.document-content h4 {
  margin-top: var(--space-8);
  font-size: var(--text-lg);
}

.document-content h5,
.document-content h6 {
  margin-top: var(--space-6);
  font-size: var(--text-base);
}

.document-content .empty-heading {
  display: none;
}

.document-content p,
.document-content li {
  max-width: 78ch;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.document-content ul,
.document-content ol {
  padding-left: var(--space-6);
}

.document-content blockquote {
  margin-block: var(--space-5);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  background: color-mix(in oklab, var(--color-primary), transparent 92%);
  color: var(--color-text-muted);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.document-content strong {
  color: var(--color-text);
}

.document-content img {
  max-height: 74vh;
  width: auto;
  margin-block: var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin-block: var(--space-5);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.document-content table {
  min-width: 720px;
  font-size: var(--text-sm);
}

.document-content th,
.document-content td {
  padding: var(--space-3);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 88%);
  vertical-align: top;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.document-content th {
  background: color-mix(in oklab, var(--color-primary), transparent 88%);
  color: var(--color-text);
  font-weight: 700;
  text-align: left;
}

.document-content tr:nth-child(even) td {
  background: color-mix(in oklab, var(--color-surface-offset), transparent 55%);
}

.document-content mark {
  border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--color-rust), transparent 72%);
  color: var(--color-text);
  padding-inline: 0.1em;
}

.search-hidden {
  display: none !important;
}

.page-gallery-section {
  max-width: var(--content-wide);
  margin: var(--space-24) auto 0;
  padding: 0 clamp(var(--space-4), 5vw, var(--space-12)) var(--space-24);
}

.gallery-heading {
  display: flex;
  gap: var(--space-6);
  align-items: end;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.gallery-heading p {
  max-width: 68ch;
  margin-top: var(--space-3);
  color: var(--color-text-muted);
}

.page-jump {
  display: grid;
  gap: var(--space-2);
  min-width: 180px;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.page-grid {
  columns: 4 220px;
  column-gap: var(--space-4);
}

.page-card {
  break-inside: avoid;
  margin: 0 0 var(--space-4);
  padding: var(--space-2);
  border: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.page-card a {
  display: block;
  overflow: hidden;
  border-radius: calc(var(--radius-lg) - var(--space-2));
  background: white;
}

.page-card img {
  width: 100%;
}

.page-card figcaption {
  padding: var(--space-2) var(--space-1) 0;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 700;
}

.site-footer {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-10) clamp(var(--space-4), 5vw, var(--space-12));
  border-top: 1px solid color-mix(in oklab, var(--color-text), transparent 86%);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

@media (max-width: 1040px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .overview-grid {
    grid-template-columns: 1fr;
  }

  .overview-grid article {
    min-height: unset;
    transform: none !important;
  }

  .workbook-shell {
    grid-template-columns: 1fr;
  }

  .toc-inner {
    position: static;
    max-height: unset;
  }

  .toc-inner nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .top-nav {
    grid-column: 1 / -1;
    justify-content: start;
    overflow-x: auto;
  }

  .hero {
    padding-top: var(--space-12);
  }

  .hero h1 {
    font-size: var(--text-3xl);
  }

  .stats-grid,
  .toc-inner nav {
    grid-template-columns: 1fr;
  }

  .reader-header,
  .document-content {
    padding: var(--space-5);
    border-radius: var(--radius-xl);
  }

  .gallery-heading {
    display: grid;
  }

  .page-grid {
    columns: 2 150px;
  }
}

@media print {
  .site-header,
  .toc-panel,
  .session-bar,
  .page-gallery-section,
  .site-footer,
  .hero,
  .overview {
    display: none !important;
  }

  .workbook-shell,
  .document-content {
    display: block;
    max-width: none;
    margin: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
  }
}