:root {
  color-scheme: light;
  --bg: #fafafa;
  --bg-content: #ffffff;
  --bg-muted: #f4f4f5;
  --border: #ececec;
  --border-strong: #e4e4e7;
  --text: #09090b;
  --text-body: #1f1f23;
  --text-secondary: #3f3f46;
  --text-muted: #52525b;
  --text-faint: #a1a1aa;
  --accent: #18181b;
  --accent-strong: #0a0a0a;
  --link: #2563eb;
  --link-hover: #1d4ed8;
  --code-bg: #0a0a0a;
  --code-text: #e4e4e7;
  --callout-info-bg: #eff6ff;
  --callout-info-border: #bfdbfe;
  --callout-info-text: #1e3a5f;
  --callout-tip-bg: #f0fdf4;
  --callout-tip-border: #bbf7d0;
  --callout-tip-text: #14532d;
  --callout-warning-bg: #fffbeb;
  --callout-warning-border: #fde68a;
  --callout-warning-text: #78350f;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 1px 3px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.04);
  --radius: 10px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, system-ui, "Segoe UI", sans-serif;
  font-size: 17px;
  color: var(--text-body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

img,
video {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

video {
  background: #111827;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

code {
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.12em 0.4em;
  font-size: 0.9em;
  color: var(--text);
}

pre {
  position: relative;
  overflow-x: auto;
  padding: 1.125rem 1.25rem;
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-text);
  box-shadow: var(--shadow-sm);
  border: 1px solid #18181b;
  font-size: 0.9375rem;
  line-height: 1.65;
  --copy-button-opacity: 0;
}

pre:hover {
  --copy-button-opacity: 1;
}

pre code {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-content);
}

th,
td {
  padding: 0.75rem 1rem;
  text-align: left;
}

th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

td {
  border-bottom: 1px solid var(--border);
}

tr:last-child td {
  border-bottom: none;
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.875rem 1.125rem;
  border: 1px solid var(--callout-info-border);
  border-radius: var(--radius);
  background: var(--callout-info-bg);
  color: var(--callout-info-text);
}

blockquote p {
  margin: 0.25rem 0;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── Layout ───────────────────────────────────── */

.layout {
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr);
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────── */

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-content);
  border-right: 1px solid var(--border);
  z-index: 20;
}

.sidebar__header {
  padding: 1.25rem 1rem 0.75rem;
}

.sidebar__close {
  display: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand__icon {
  width: 30px;
  height: 30px;
  background: var(--accent-strong);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.brand__text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: -0.01em;
}

.brand__eyebrow {
  display: block;
  margin-top: 1px;
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ── Search ───────────────────────────────────── */

.search {
  padding: 0 1rem 0.875rem;
}

.search input {
  width: 100%;
  padding: 0.55rem 0.75rem 0.55rem 2.125rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='%2371717a' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85zm-5.242.156a5 5 0 1 1 0-10 5 5 0 0 1 0 10z'/%3E%3C/svg%3E") no-repeat 0.7rem center;
  font: inherit;
  font-size: 0.8125rem;
  color: var(--text);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.search input::placeholder {
  color: var(--text-faint);
}

.search input:focus {
  outline: none;
  border-color: var(--accent);
  background-color: var(--bg-content);
  box-shadow: 0 0 0 3px rgba(24, 24, 27, 0.08);
}

.sidebar__divider {
  height: 1px;
  background: var(--border);
  margin: 0 1rem 0.5rem;
}

/* ── Navigation ───────────────────────────────── */

.nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.25rem 0.625rem 1rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.12) transparent;
}

.nav::-webkit-scrollbar {
  width: 4px;
}

.nav::-webkit-scrollbar-track {
  background: transparent;
}

.nav::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
  border-radius: 2px;
}

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

.nav li + li {
  margin-top: 1px;
}

.nav__item {
  margin: 0;
}

.nav a {
  display: block;
  padding: 0.45rem 0.625rem 0.45rem 0.75rem;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.45;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.nav a:hover {
  background: var(--bg-muted);
  color: var(--text);
  text-decoration: none;
}

.nav a.active {
  background: var(--bg-muted);
  color: var(--text);
  border-left-color: var(--accent);
  font-weight: 600;
}

.nav a.active-branch {
  color: var(--text);
}

.nav a.nav__top-level-link {
  padding: 0.5rem 0.625rem;
  border-left: none;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 600;
}

.nav a.nav__top-level-link.active {
  border-left-color: transparent;
}

.nav__item--group > .nav__group-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.625rem;
  border: none;
  border-radius: var(--radius-sm);
  background: none;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: background 120ms ease;
}

.nav__item--group > .nav__group-toggle:hover {
  background: var(--bg-muted);
}

.nav__group-toggle.active-branch {
  color: var(--text);
}

.nav__group-icon {
  font-size: 1rem;
  flex-shrink: 0;
  line-height: 1;
}

.nav__group-label {
  flex: 1;
}

.nav__toggle-arrow {
  font-size: 0.55rem;
  color: var(--text-faint);
  flex-shrink: 0;
  transition: transform 200ms ease;
}

.nav__item--group.collapsed > .nav__group-toggle .nav__toggle-arrow {
  transform: rotate(-90deg);
}

.nav__children {
  margin-top: 2px;
  margin-left: 1.125rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
}

.nav__item--group.collapsed > .nav__children {
  display: none;
}

.nav__label {
  display: block;
  padding: 0.4rem 0.625rem;
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

.nav__status {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  padding: 0.4rem 0.625rem;
}

.nav__status--hint {
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
}

.nav__results {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__result-link {
  display: grid;
  gap: 0.12rem;
}

.nav__result-title {
  font-weight: 600;
  color: var(--text);
}

.nav__result-meta,
.nav__result-snippet {
  color: var(--text-secondary);
  font-size: 0.75rem;
  line-height: 1.45;
}

.nav__result-snippet {
  display: -webkit-box;
  overflow: hidden;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

/* ── Mobile top bar / drawer / search overlay ─── */

.mobile-topbar {
  display: none;
}

.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 19;
}

.mobile-search-overlay {
  display: none;
}

/* ── Content shell ────────────────────────────── */

.content-shell {
  display: flex;
  padding: 2rem 2.5rem;
  min-width: 0;
}

.content-main {
  flex: 1;
  max-width: 840px;
  min-width: 0;
}

/* ── Breadcrumb ───────────────────────────────── */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--text);
  text-decoration: none;
}

.breadcrumb__separator {
  color: var(--text-faint);
}

/* ── Top bar ──────────────────────────────────── */

.topbar {
  margin-bottom: 1.75rem;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.875rem, 3vw, 2.125rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.topbar:empty {
  display: none;
}

/* ── Content ──────────────────────────────────── */

.content {
  font-size: 1rem;
  line-height: 1.75;
}

.content h1 {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--text);
  margin: 2.75rem 0 1.125rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.content h1:first-child {
  margin-top: 0;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 3rem 0 1rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
  position: relative;
}

.content h3 {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text);
  margin: 2.25rem 0 0.625rem;
  line-height: 1.35;
  position: relative;
}

.content h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.75rem 0 0.5rem;
}

.content h1,
.content h2,
.content h3,
.content h4 {
  scroll-margin-top: 1.5rem;
}

.content p {
  margin: 1.125rem 0;
}

.content ul,
.content ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

.content li {
  margin-bottom: 0.5rem;
}

.content li > p {
  margin: 0.5rem 0;
}

.content strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Home (module cards) ──────────────────────── */

.home-hero {
  margin: 0 0 2rem;
}

.home-hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.home-hero__lead {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.875rem;
  margin: 0;
}

.module-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1.125rem 1.125rem;
  background: var(--bg-content);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-body);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.module-card:hover {
  border-color: #d4d4d8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--text-body);
}

.module-card__icon {
  font-size: 1.375rem;
  line-height: 1;
}

.module-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.module-card__desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.module-card__count {
  font-size: 0.8125rem;
  color: var(--text-faint);
  font-weight: 500;
}

/* ── Table of contents (desktop) ──────────────── */

.toc {
  width: 200px;
  flex-shrink: 0;
  margin-left: 3rem;
  position: sticky;
  top: 2rem;
  align-self: start;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
}

.toc:empty,
.toc.toc--hidden {
  display: none;
}

.toc__label {
  font-size: 0.688rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}

.toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--border);
}

.toc__item {
  margin: 0;
}

.toc__link {
  display: block;
  padding: 0.4rem 0 0.4rem 0.875rem;
  margin-left: -2px;
  border-left: 2px solid transparent;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 120ms ease, border-color 120ms ease;
}

.toc__link:hover {
  color: var(--text);
  text-decoration: none;
}

.toc__link.active {
  color: var(--text);
  border-left-color: var(--accent);
  font-weight: 500;
}

.toc__link--h3 {
  padding-left: 1.75rem;
}

/* ── Mobile TOC ───────────────────────────────── */

.mobile-toc {
  display: none;
}

/* ── Copy code button ─────────────────────────── */

.copy-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.625rem;
  font: inherit;
  font-size: 0.75rem;
  font-family: "Inter", -apple-system, system-ui, sans-serif;
  color: var(--code-text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  cursor: pointer;
  opacity: var(--copy-button-opacity);
  transition: opacity 160ms ease, background 120ms ease;
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.15);
}

.copy-button.is-copied {
  background: rgba(34, 197, 94, 0.2);
  border-color: rgba(34, 197, 94, 0.4);
  color: #bbf7d0;
}

@media (hover: none) {
  .copy-button {
    opacity: 1;
  }
}

/* ── Anchor headings ──────────────────────────── */

.anchor {
  margin-left: 0.5rem;
  color: var(--text-faint);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity 160ms ease, color 120ms ease;
}

.anchor:hover {
  color: var(--text);
  text-decoration: none;
}

.content h2:hover .anchor,
.content h3:hover .anchor,
.anchor:focus {
  opacity: 1;
}

.anchor__feedback {
  margin-left: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #16a34a;
}

@media (hover: none) {
  .anchor {
    opacity: 0.6;
  }
}

/* ── Image lightbox ───────────────────────────── */

.content img {
  cursor: zoom-in;
}

.content a img {
  cursor: pointer;
}

.content video {
  display: block;
  width: 100%;
  margin: 1.5rem 0;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(9, 9, 11, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 40;
  cursor: zoom-out;
}

.lightbox.is-open {
  display: flex;
}

.lightbox__img {
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  border: none;
}

/* ── Callouts ─────────────────────────────────── */

blockquote.callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
}

blockquote.callout::before {
  font-size: 1.125rem;
  line-height: 1.5;
  flex-shrink: 0;
}

blockquote.callout--info {
  background: var(--callout-info-bg);
  border-color: var(--callout-info-border);
  color: var(--callout-info-text);
}

blockquote.callout--info::before {
  content: "ℹ️";
}

blockquote.callout--tip {
  background: var(--callout-tip-bg);
  border-color: var(--callout-tip-border);
  color: var(--callout-tip-text);
}

blockquote.callout--tip::before {
  content: "💡";
}

blockquote.callout--warning {
  background: var(--callout-warning-bg);
  border-color: var(--callout-warning-border);
  color: var(--callout-warning-text);
}

blockquote.callout--warning::before {
  content: "⚠️";
}

blockquote.callout p:first-child {
  margin-top: 0;
}

blockquote.callout p:last-child {
  margin-bottom: 0;
}

/* ── Prev / Next pager ────────────────────────── */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
  margin: 3rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.pager__link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.875rem 1.125rem;
  background: var(--bg-content);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-body);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.pager__link:hover {
  border-color: #d4d4d8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--text-body);
}

.pager__link--next {
  text-align: right;
  grid-column-start: 2;
}

.pager__direction {
  font-size: 0.75rem;
  color: var(--text-faint);
  font-weight: 500;
}

.pager__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* ── Back to top ──────────────────────────────── */

.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 10px;
  background: var(--accent-strong);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(9, 9, 11, 0.25);
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms ease, visibility 200ms ease, transform 200ms ease;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(9, 9, 11, 0.35);
}

/* ── Utilities ────────────────────────────────── */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Tablet ───────────────────────────────────── */

@media (max-width: 960px) {
  .module-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Mobile ───────────────────────────────────── */

@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
  }

  body.drawer-open,
  body.search-open {
    overflow: hidden;
  }

  .content h1,
  .content h2,
  .content h3,
  .content h4 {
    scroll-margin-top: 4rem;
  }

  .mobile-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-content);
    position: sticky;
    top: 0;
    z-index: 15;
  }

  .mobile-topbar__menu {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text);
    line-height: 1;
  }

  .mobile-topbar__brand {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
  }

  .mobile-topbar__search {
    background: none;
    border: none;
    font-size: 1.125rem;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text-secondary);
    line-height: 1;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 85%;
    max-width: 320px;
    height: 100%;
    transform: translateX(-100%);
    transition: transform 280ms cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 20;
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.12);
  }

  .sidebar__close {
    display: block;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    color: var(--text-secondary);
    line-height: 1;
  }

  .sidebar__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
  }

  body.drawer-open .sidebar {
    transform: translateX(0);
  }

  body.drawer-open .drawer-overlay {
    display: block;
  }

  .content-shell {
    padding: 1.25rem 1rem;
    flex-direction: column;
  }

  .topbar h1 {
    font-size: 1.4rem;
  }

  .toc {
    display: none;
  }

  .mobile-toc {
    display: block;
    background: var(--bg-content);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
  }

  .mobile-toc:empty,
  .mobile-toc.toc--hidden {
    display: none;
  }

  .mobile-toc__toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: none;
    background: none;
    font: inherit;
    font-size: 0.688rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    cursor: pointer;
  }

  .mobile-toc__arrow {
    font-size: 0.6rem;
    color: var(--text-faint);
    transition: transform 200ms ease;
  }

  .mobile-toc.collapsed .mobile-toc__arrow {
    transform: rotate(-90deg);
  }

  .mobile-toc__list {
    margin: 0;
    padding: 0 0.875rem 0.625rem;
    list-style: none;
    border-left: 2px solid var(--border);
    margin-left: 0.875rem;
  }

  .mobile-toc.collapsed .mobile-toc__list {
    display: none;
  }

  .mobile-toc__link {
    display: block;
    padding: 0.2rem 0 0.2rem 0.6rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
  }

  .mobile-toc__link:hover {
    color: var(--text);
  }

  .mobile-toc__link--h3 {
    padding-left: 1.25rem;
  }

  .mobile-search-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-content);
    z-index: 25;
    flex-direction: column;
  }

  .mobile-search-overlay.active {
    display: flex;
  }

  .mobile-search-overlay__header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
  }

  .mobile-search-overlay__icon {
    color: var(--text-muted);
    font-size: 1rem;
    flex-shrink: 0;
  }

  .mobile-search-overlay__input {
    flex: 1;
    border: none;
    font: inherit;
    font-size: 0.938rem;
    color: var(--text);
    background: none;
    outline: none;
  }

  .mobile-search-overlay__cancel {
    background: none;
    border: none;
    font: inherit;
    font-size: 0.875rem;
    color: var(--link);
    cursor: pointer;
    font-weight: 500;
    flex-shrink: 0;
  }

  .mobile-search-overlay__results {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 1rem;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 34px;
    height: 34px;
    font-size: 0.875rem;
  }

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

  .pager__link--next {
    grid-column-start: auto;
  }
}

@media (max-width: 640px) {
  .module-grid {
    grid-template-columns: 1fr;
  }
}