/* The documentation: a sidebar with every page, and the article. */

.doc-grid {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  align-items: start;
  gap: 36px;
  padding-bottom: 64px;
}

.doc-main {
  min-width: 0;
  max-width: 800px;
}

.doc-header {
  padding: 28px 0 12px;
}

.doc-header h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.doc-header .kicker { margin-bottom: 6px; }

/* ---------- Sidebar ---------- */

.doc-sidebar {
  position: sticky;
  top: var(--header-height);
  max-height: calc(100vh - var(--header-height));
  padding: 24px 4px 24px 0;
  overflow-y: auto;
  scrollbar-width: thin;
}

.doc-nav-toggle > summary { display: none; }

.doc-nav-group {
  margin: 18px 0 6px;
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-nav-group:first-child { margin-top: 0; }

.doc-nav ul,
.doc-nav ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.doc-nav > ul > li > a {
  display: block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  color: var(--ink-2);
  font-size: 14.5px;
  font-weight: 500;
}

.doc-nav > ul > li > a:hover {
  background: var(--bg-sunken);
  color: var(--ink);
  text-decoration: none;
}

.doc-nav > ul > li.here > a {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* The sections of the current page. */
.doc-nav li.here > ol {
  margin: 6px 0 8px 10px;
  border-left: 1px solid var(--line);
}

.doc-nav li.here ol a {
  display: block;
  margin-left: -1px;
  padding: 4px 0 4px 14px;
  border-left: 2px solid transparent;
  color: var(--ink-3);
  font-size: 13.5px;
  line-height: 1.4;
}

.doc-nav li.here ol ol a { padding-left: 26px; font-size: 13px; }

.doc-nav li.here ol a:hover { color: var(--ink); text-decoration: none; }

.doc-nav li.here ol a.active {
  border-left-color: var(--accent);
  color: var(--ink);
}

@media (max-width: 900px) {
  .doc-grid { grid-template-columns: minmax(0, 1fr); gap: 0; }

  .doc-sidebar {
    position: static;
    max-height: none;
    margin: 16px 0 0;
    padding: 0;
    overflow: visible;
  }

  .doc-nav-toggle {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--bg-raised);
  }

  .doc-nav-toggle > summary {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 12px 16px;
    cursor: pointer;
    list-style: none;
  }

  .doc-nav-toggle > summary::-webkit-details-marker { display: none; }

  .doc-nav-toggle > summary::after {
    content: "";
    width: 8px;
    height: 8px;
    margin-left: auto;
    border-right: 2px solid var(--ink-3);
    border-bottom: 2px solid var(--ink-3);
    transform: translateY(-2px) rotate(45deg);
    transition: transform 0.2s;
  }

  .doc-nav-toggle[open] > summary::after { transform: translateY(2px) rotate(-135deg); }

  .doc-nav-label {
    color: var(--ink-3);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .doc-nav-current { color: var(--ink); font-weight: 600; }

  .doc-nav { padding: 4px 12px 16px; border-top: 1px solid var(--line); }
  .doc-nav-group:first-child { margin-top: 16px; }
  .doc-header { padding-top: 32px; }
}

/* ---------- Overview ---------- */

.guide-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 28px 0 8px;
}

.prose a.card { text-decoration: none; }

.guide-kicker {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.prose .guide-card p { margin: 0; font-size: 15px; line-height: 1.6; }

.guide-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 4px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}

.prose .card-grid { margin: 20px 0; }
.prose .card h3 { margin: 0; }

@media (max-width: 640px) {
  .guide-grid { grid-template-columns: minmax(0, 1fr); }
}

.source-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}

.source-table th,
.source-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.source-table tbody tr:last-child td { border-bottom: 0; }

.source-table th {
  color: var(--ink-3);
  font-size: 12.5px;
  font-weight: 600;
}

.source-table td { color: var(--ink-2); }
.source-table td code { font-size: 13px; white-space: nowrap; }

/* ---------- Article ---------- */

.prose {
  min-width: 0;
  max-width: 780px;
}

.prose > p:first-child {
  margin-top: 0;
  color: var(--ink);
  font-size: 19px;
  line-height: 1.65;
}

.prose h2 {
  margin: 36px 0 10px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.prose h3 {
  margin: 28px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.prose section:first-of-type > h2:first-child { margin-top: 28px; }

.prose p,
.prose li {
  color: var(--ink-2);
  font-size: 16.5px;
  line-height: 1.75;
}

.prose p { margin: 10px 0; }

.prose ul,
.prose ol {
  margin: 14px 0;
  padding-left: 1.3em;
}

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin: 6px 0; }
.prose li > p { margin: 0; }
.prose li::marker { color: var(--ink-3); }

.prose a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 3px;
}

.prose a:hover { text-decoration-color: var(--accent); }

.prose strong { color: var(--ink); }

.prose code.hl.lean.block,
.prose pre { font-size: 13px; }

.prose .code-block-wrapper,
.prose > section > code.hl.lean.block,
.prose > code.hl.lean.block,
.prose pre {
  margin: 20px 0;
}

.prose .code-block-wrapper > code.hl.lean.block,
.prose .code-block-wrapper > pre {
  margin: 0;
}

.prose .legend { margin: 20px 0 8px; }

/* Combinator signature and recipe figures */

.signature {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  line-height: 1.25;
  margin: 6px 0 12px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

.signature .role-tag { align-self: center; }
.signature .tool { width: 34px; height: 34px; margin: -2px 0; }

.signature-arrow {
  color: var(--ink-3);
  font-size: 13px;
}

.recipe-figure {
  display: grid;
  gap: 10px;
  margin: 6px 0 14px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

.recipe-figure figcaption { margin: 0; }

/* ---------- Pager ---------- */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

.prose a.pager-link { text-decoration: none; }

a.pager-link:hover { border-color: var(--accent); text-decoration: none; }

.pager-link span {
  color: var(--ink-3);
  font-size: 13px;
}

.pager-link strong {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.pager-link.next { text-align: right; }

.pager-link.empty {
  visibility: hidden;
  border: 0;
  background: none;
}

@media (max-width: 520px) {
  .pager { grid-template-columns: 1fr; }
  .pager-link.empty { display: none; }
}

/* ---------- Callouts in articles ---------- */

.prose .callout { margin: 20px 0; }
.prose .callout p { margin: 0; color: var(--ink); }

/* ---------- Combinator usage table ---------- */

.usage-figure { margin: 20px 0 0; }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
}

.usage-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.usage-table th,
.usage-table td {
  padding: 7px 8px;
  border-bottom: 1px solid var(--line);
  text-align: center;
  white-space: nowrap;
}

.usage-table tbody tr:last-child > * { border-bottom: 0; }

.usage-table th[scope="row"],
.usage-table .col-name {
  padding-left: 14px;
  text-align: left;
  font-weight: 500;
  color: var(--ink);
}

.usage-table thead th {
  vertical-align: bottom;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-3);
  font-size: 12.5px;
  font-weight: 600;
}

.usage-table .col-comb span {
  display: inline-block;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  padding: 4px 0;
  font-family: var(--font-mono);
  font-weight: 500;
}

.usage-table .col-comb.role-principal { color: var(--principal); }
.usage-table .col-comb.role-derived { color: var(--derived); }

/* Separate the principal combinators from the derived ones. */
.usage-table thead th:nth-child(6),
.usage-table tbody td:nth-child(6) {
  border-right: 1px solid var(--line-strong);
}

.usage-table tr.group th {
  padding: 14px 14px 6px;
  background: var(--bg-sunken);
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}



.use { font-size: 15px; line-height: 1; }
.use.direct { color: var(--accent); }
.use.transitive { color: var(--ink-3); }

.usage-figure figcaption {
  margin-top: 10px;
  color: var(--ink-3);
  font-size: 13.5px;
}