/* A single design system shared by the collection and all eight readers. */
:root {
  color-scheme: light;
  --bg: #f7f9fa;
  --panel: #ffffff;
  --panel-2: #f0f4f5;
  --panel-3: #e7eef0;
  --line: #dce4e7;
  --line-soft: #e9eef0;
  --text: #182b34;
  --muted: #526874;
  --faint: #5b707b;
  --cyan: #087681;
  --cyan-2: #066972;
  --accent-soft: #e6f4f3;
  --blue: #2563a7;
  --green: #15803d;
  --yellow: #916600;
  --red: #b42e4d;
  --purple: #7251a8;
  --orange: #ad5228;
  --rust: #a85335;
  --rust-soft: #fbefe8;
  --sidebar-bg: #fbfcfc;
  --code-bg: #f8fafb;
  --code-text: #233b48;
  --inline-code: #25616a;
  --table-key: #254955;
  --syntax-keyword: #8550a4;
  --syntax-string: #247448;
  --syntax-comment: #5b707b;
  --syntax-number: #a2582a;
  --syntax-macro: #117585;
  --syntax-type: #b43d61;
  --syntax-key: #315eaf;
  --shadow: 0 12px 32px rgb(20 42 50 / 0.05);
  --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius: 0.85rem;
  --header-row: 4.5rem;
  --safe-top: env(safe-area-inset-top, 0px);
  --top: calc(var(--header-row) + var(--safe-top));
  --sidebar: 18.5rem;
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #0d161c;
  --panel: #121f27;
  --panel-2: #17262f;
  --panel-3: #20333e;
  --line: #293c47;
  --line-soft: #21323c;
  --text: #edf3f4;
  --muted: #a4b8c2;
  --faint: #91a8b4;
  --cyan: #79d9d0;
  --cyan-2: #a0e8df;
  --accent-soft: #193b3c;
  --blue: #8dbbfa;
  --green: #94d6ad;
  --yellow: #e4c47f;
  --red: #f0a1af;
  --purple: #c7ace8;
  --orange: #e5b08d;
  --rust: #e5ae8c;
  --rust-soft: #352a26;
  --sidebar-bg: #101b22;
  --code-bg: #101b22;
  --code-text: #d4e4eb;
  --inline-code: #b4e3e0;
  --table-key: #c8dde6;
  --syntax-keyword: #c8ade4;
  --syntax-string: #99d3ae;
  --syntax-comment: #91a8b4;
  --syntax-number: #e5b08d;
  --syntax-macro: #88d5d2;
  --syntax-type: #eca4b7;
  --syntax-key: #9abff4;
  --shadow: 0 12px 32px rgb(0 0 0 / 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--top) + 1.5rem);
  scrollbar-gutter: stable;
}
html.restore-scroll {
  scroll-behavior: auto !important;
}
body {
  margin: 0;
  padding-top: var(--top);
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.75 var(--font-sans);
  overflow-wrap: break-word;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
body.nav-open {
  position: fixed;
  inset-inline: 0;
  top: var(--locked-scroll);
  width: 100%;
  overflow: hidden;
}
a {
  color: var(--cyan);
  text-decoration: none;
}
a:hover {
  color: var(--cyan-2);
}
button,
input,
summary {
  font: inherit;
}
button,
summary {
  touch-action: manipulation;
}
a,
button,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
button,
input {
  color: inherit;
}
svg {
  display: block;
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}
a:focus-visible,
button:focus-visible,
summary:focus-visible,
pre:focus-visible,
.table-wrap:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
input:focus-visible {
  outline: 0;
}
[hidden] {
  display: none !important;
}
main:focus,
.section:focus {
  outline: none;
}
::selection {
  background: color-mix(in srgb, var(--cyan) 23%, transparent);
  color: var(--text);
}
h1,
h2,
h3,
h4,
p,
dl {
  margin: 0;
}
h1,
h2,
h3,
h4 {
  color: var(--text);
}
h1 {
  font-weight: 750;
  line-height: 1.08;
  letter-spacing: -0.055em;
}
h2 {
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.035em;
}
h3 {
  font-size: 1.2rem;
  line-height: 1.4;
  letter-spacing: -0.02em;
}
h4 {
  font-size: 1rem;
  line-height: 1.5;
}
code,
pre,
kbd {
  font-family: var(--font-mono);
}
:not(pre) > code {
  padding: 0.12rem 0.3rem;
  border: 1px solid var(--line-soft);
  border-radius: 0.3rem;
  background: var(--panel-2);
  color: var(--inline-code);
  font-size: 0.86em;
  overflow-wrap: anywhere;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 1rem;
  border-radius: 0.5rem;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-200%);
}
.skip-link:focus {
  transform: translateY(0);
}
.eyebrow,
.kicker {
  color: var(--faint);
  font: 600 0.66rem/1.5 var(--font-mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--cyan);
  margin-bottom: 1rem;
}
.kicker::before {
  content: '';
  width: 1.25rem;
  height: 1px;
  background: currentColor;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 2.8rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  color: var(--text);
  font-size: 0.8125rem;
  font-weight: 600;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--accent-soft);
}
.primary-button {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.primary-button:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--panel);
}
:root[data-theme='dark'] .primary-button {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #10262b;
}
.search-field {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
  padding: 0.25rem 0.8rem;
  min-height: 2.85rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--panel);
  color: var(--faint);
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}
.search-field:focus-within {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 12%, transparent);
}
.search-field input {
  width: 100%;
  min-width: 0;
  padding: 0.35rem 0;
  border: 0;
  background: transparent;
  font-size: 0.875rem;
  color: var(--text);
}
.search-field input::placeholder {
  color: var(--faint);
  opacity: 1;
}
.search-field kbd {
  padding: 0 0.4rem;
  border: 1px solid var(--line);
  border-radius: 0.25rem;
  background: var(--bg);
  font-size: 0.75rem;
  line-height: 1.6;
}
.muted {
  color: var(--muted);
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--top);
  padding-top: var(--safe-top);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.site-header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-row);
  max-width: 91rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 4rem);
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 2.75rem;
  color: var(--text);
  font-size: 1.22rem;
  font-weight: 750;
  letter-spacing: -0.045em;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-brand:hover {
  color: var(--text);
}
.site-mark {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--bg);
  color: var(--cyan);
  font: 650 1rem/1 var(--font-mono);
  letter-spacing: -0.12em;
  padding-right: 0.1em;
}
.brand-period {
  color: var(--cyan);
}
.header-divider {
  height: 1.25rem;
  width: 1px;
  background: var(--line);
}
.header-context {
  color: var(--faint);
  font: 500 0.75rem/1.4 var(--font-mono);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: auto;
}
.all-guides-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 2.75rem;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 550;
}
.all-guides-link span {
  color: var(--cyan);
}
.theme-toggle,
.reader-menu,
.drawer-close {
  display: grid;
  place-items: center;
  flex: 0 0 2.75rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: var(--panel);
  color: var(--muted);
}
.theme-toggle:hover,
.reader-menu:hover,
.drawer-close:hover {
  background: var(--panel-2);
  color: var(--cyan);
}
.theme-toggle span {
  font:
    1.3rem/1 Arial,
    sans-serif;
}
.reader-menu {
  display: none;
}
.drawer-close {
  font-size: 1.8rem;
}
.collection-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.75rem;
}
.collection-footer > a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--muted);
}
.collection-footer > a:first-child {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.035em;
}
.reading-progress {
  height: 2px;
  position: absolute;
  bottom: -1px;
  inset-inline: 0;
}
.reading-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--cyan);
}
.error-page {
  max-width: 55rem;
  margin: 0 auto;
  padding: 14vh 1.5rem;
}
.error-page h1 {
  font-size: clamp(3rem, 8vw, 5rem);
}
.error-page p {
  margin: 2rem 0;
  color: var(--muted);
}
@media (max-width: 720px) {
  :root {
    --header-row: 4rem;
  }
  .site-header-inner {
    gap: 0.75rem;
    padding-inline: max(1rem, env(safe-area-inset-left, 0px))
      max(1rem, env(safe-area-inset-right, 0px));
  }
  .header-divider,
  .header-context {
    display: none;
  }
  .header-actions {
    gap: 0.75rem;
  }
  .home-page .all-guides-link,
  .information-page .all-guides-link {
    display: none;
  }
  .collection-footer {
    flex-wrap: wrap;
    margin-top: 2rem;
    padding-bottom: max(1.5rem, env(safe-area-inset-bottom, 0px));
    gap: 0.4rem 1rem;
  }
  .collection-footer > span {
    order: 3;
    width: 100%;
  }
  .search-field input {
    font-size: 1rem;
  }
}

.home-main {
  width: 100%;
  max-width: 87rem;
  padding: 0 clamp(1.25rem, 4vw, 4rem);
  margin-inline: auto;
}
.library-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: 4rem;
  padding: 4.5rem 0 3.75rem;
}
.library-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.4rem;
  color: var(--faint);
  font: 600 0.64rem/1.6 var(--font-mono);
  letter-spacing: 0.1em;
}
.status-dot {
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.library-hero h1 {
  font-size: clamp(3rem, 5.5vw, 5rem);
}
.library-hero h1 span {
  color: var(--cyan);
}
.library-intro > p {
  max-width: 29rem;
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.85;
}
.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 2rem;
  min-height: 2.75rem;
  margin-top: 1rem;
  font-size: 0.8125rem;
  font-weight: 650;
}
.hero-link span {
  font-size: 1.1rem;
}
.library-summary {
  overflow: hidden;
  align-self: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.summary-caption {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--faint);
  font: 400 0.72rem/1.5 var(--font-mono);
}
.summary-caption > span {
  color: var(--cyan);
  font-size: 0.9rem;
}
.library-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 2.1rem 1.5rem;
}
.library-stats div {
  display: flex;
  flex-direction: column-reverse;
  gap: 0.8rem;
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}
.library-stats div:first-child {
  padding-left: 0;
  border: 0;
}
.library-stats dd {
  margin: 0;
  color: var(--text);
  font: 500 clamp(1.8rem, 3vw, 2.7rem)/1 var(--font-mono);
  letter-spacing: -0.065em;
}
.library-stats dt {
  color: var(--faint);
  font-size: 0.6875rem;
}
.summary-languages {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--line-soft);
  background: var(--bg);
  font-size: 0.7rem;
  color: var(--muted);
}
.summary-languages > span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.summary-languages > span:last-child {
  margin-left: auto;
  color: var(--faint);
  font-size: 0.75rem;
}
.language-dot {
  display: inline-block;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
}
.language-dot.rust {
  background: var(--rust);
}
.language-dot.python {
  background: var(--cyan);
}
.catalog {
  scroll-margin-top: 0;
}
.catalog-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.75rem 0 1.4rem;
  border-top: 1px solid var(--line);
}
.catalog-title .eyebrow {
  display: block;
  margin-bottom: 0.45rem;
}
.catalog-title h2 {
  font-size: 1.55rem;
}
#filter-status {
  color: var(--faint);
  font-size: 0.75rem;
}
.catalog-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.4rem;
}
.language-filters {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--panel-2);
}
.language-filters button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: 2.4rem;
  padding: 0.4rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.45rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  transition:
    color 0.15s,
    background 0.15s;
}
.language-filters button span {
  font: 400 0.65rem/1.5 var(--font-mono);
  opacity: 0.8;
}
.language-filters button:hover {
  color: var(--text);
}
.language-filters button[aria-pressed='true'] {
  background: var(--panel);
  border-color: var(--line);
  color: var(--text);
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.04);
}
.catalog-controls .search-field {
  flex: 0 1 20rem;
}
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}
.catalog-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.5rem;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition:
    border-color 0.18s,
    box-shadow 0.18s,
    transform 0.18s;
}
.catalog-card:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--cyan) 55%, var(--line));
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}
.catalog-card-top {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1.4rem;
}
.catalog-mark {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  flex-shrink: 0;
  border: 1px solid color-mix(in srgb, var(--cyan) 14%, var(--line));
  border-radius: 0.65rem;
  background: var(--accent-soft);
  color: var(--cyan);
  font: 600 1.15rem/1 var(--font-mono);
}
.catalog-card[data-guide-language='rust'] .catalog-mark {
  background: var(--rust-soft);
  color: var(--rust);
  border-color: color-mix(in srgb, var(--rust) 15%, var(--line));
}
.catalog-language {
  color: var(--faint);
  font: 500 0.75rem/1.5 var(--font-mono);
}
.catalog-number {
  margin-left: auto;
  color: var(--faint);
  font: 400 0.6875rem/1.5 var(--font-mono);
}
.catalog-card-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
}
.catalog-card h3 {
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.04em;
}
.catalog-purpose {
  margin-top: 0.75rem;
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 600;
}
.catalog-description {
  margin: 0.6rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.8;
}
.catalog-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
}
.catalog-topics span {
  padding: 0.2rem 0.45rem;
  border-radius: 0.3rem;
  background: var(--bg);
  border: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.5;
}
.catalog-card-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-top: 1.35rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  color: var(--faint);
  font-size: 0.75rem;
}
.catalog-card-bottom strong {
  color: var(--muted);
  font-weight: 600;
}
.catalog-dot {
  margin-inline: 0.3rem;
  color: var(--line);
}
.catalog-open {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 600;
}
.catalog-open > span {
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.18s;
}
.catalog-card:hover .catalog-open > span {
  transform: translate(2px, -2px);
}
.catalog-empty {
  padding: 4rem 1rem;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}
.catalog-empty > span {
  display: block;
  color: var(--cyan);
  font-size: 2rem;
}
.catalog-empty p {
  margin: 0.5rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.875rem;
}
@media (max-width: 1100px) {
  .library-hero {
    gap: 2.5rem;
  }
  .library-stats {
    padding: 1.75rem 1.2rem;
  }
  .summary-languages > span:last-child {
    width: 100%;
    margin-left: 0;
  }
  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 800px) {
  .library-hero {
    grid-template-columns: 1fr;
    padding: 3rem 0 2.5rem;
    gap: 2rem;
  }
  .library-hero h1 {
    font-size: clamp(3.1rem, 9vw, 4.5rem);
  }
  .library-summary {
    max-width: 35rem;
    width: 100%;
  }
  .library-stats {
    padding: 1.4rem;
  }
  .library-stats div {
    padding-left: 1.5rem;
  }
  .summary-caption,
  .summary-languages {
    display: none;
  }
  .catalog-controls .search-field {
    flex: 1 1 16rem;
  }
}
@media (max-width: 560px) {
  .library-hero {
    padding: 2.5rem 0 2rem;
    gap: 1.5rem;
  }
  .library-eyebrow {
    font-size: 0.56rem;
    letter-spacing: 0.07em;
    margin-bottom: 1.2rem;
  }
  .library-hero h1 {
    font-size: clamp(2.65rem, 11.5vw, 3.7rem);
  }
  .library-intro > p {
    font-size: 0.875rem;
    margin-top: 1rem;
  }
  .hero-link {
    margin-top: 0.65rem;
  }
  .library-stats {
    padding: 1.2rem 0.9rem;
  }
  .library-stats div {
    padding-left: 0.85rem;
    gap: 0.65rem;
  }
  .library-stats dd {
    font-size: 1.65rem;
  }
  .library-stats dt {
    font-size: 0.59rem;
  }
  .catalog-toolbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.65rem;
    padding: 1.5rem 0 1.1rem;
  }
  .catalog-title h2 {
    font-size: 1.4rem;
  }
  .catalog-controls {
    gap: 0.8rem;
  }
  .language-filters {
    display: grid;
    grid-template-columns: 1.25fr 1fr 1fr;
    width: 100%;
  }
  .language-filters button {
    padding-inline: 0.5rem;
    min-height: 2.65rem;
    gap: 0.5rem;
  }
  .catalog-controls .search-field {
    flex-basis: 100%;
  }
  .catalog-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .catalog-card {
    padding: 1.35rem;
  }
  .catalog-card h3 {
    font-size: 1.8rem;
  }
  .catalog-description {
    font-size: 0.875rem;
  }
  .catalog-card-bottom {
    font-size: 0.75rem;
  }
}

.reader-page .site-header-inner {
  max-width: none;
  padding-inline: 1.5rem;
}
.sidebar {
  position: fixed;
  inset: var(--top) auto 0 0;
  z-index: 40;
  width: var(--sidebar);
  overflow: auto;
  padding: 1.25rem 0.9rem max(2rem, env(safe-area-inset-bottom, 0px));
  border-right: 1px solid var(--line);
  background: var(--sidebar-bg);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
  overscroll-behavior: contain;
}
.drawer-heading {
  display: none;
}
.guide-picker {
  margin: 0 0 1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--panel);
  overflow: hidden;
}
.guide-picker summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 4.1rem;
  padding: 0.85rem;
  list-style: none;
}
.guide-picker summary::-webkit-details-marker {
  display: none;
}
.guide-picker summary strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 650;
  line-height: 1.4;
}
.guide-picker summary small {
  display: block;
  margin-top: 0.3rem;
  color: var(--faint);
  font: 400 0.6875rem/1.4 var(--font-mono);
}
.brand-mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.55rem;
  background: var(--accent-soft);
  color: var(--cyan);
  font: 650 1rem/1 var(--font-mono);
}
.picker-chevron {
  margin-left: auto;
  color: var(--faint);
  transition: transform 0.15s;
}
.guide-picker[open] .picker-chevron {
  transform: rotate(180deg);
}
.guide-picker nav {
  padding: 0.4rem;
  border-top: 1px solid var(--line-soft);
}
.guide-picker nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 2.75rem;
  padding: 0.5rem 0.65rem;
  border-radius: 0.4rem;
  color: var(--muted);
  font-size: 0.8125rem;
}
.guide-picker nav a span {
  color: var(--faint);
  font: 400 0.625rem/1.4 var(--font-mono);
}
.guide-picker nav a:hover,
.guide-picker nav a[aria-current='page'] {
  background: var(--accent-soft);
  color: var(--cyan);
}
.section-search {
  margin-bottom: 1.5rem;
}
.section-search .search-field {
  padding-inline: 0.65rem;
  background: var(--panel);
}
.section-search input {
  font-size: 0.8125rem;
}
.sidebar-heading {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0.6rem 0.75rem;
  color: var(--faint);
  font: 600 0.625rem/1.5 var(--font-mono);
  letter-spacing: 0.09em;
}
.nav-group {
  margin: 0.75rem 0 1.3rem;
}
.nav-label {
  margin: 0 0.65rem 0.5rem;
  color: var(--faint);
  font: 600 0.625rem/1.5 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  min-height: 2.75rem;
  padding: 0.65rem 0.6rem;
  margin-bottom: 0.15rem;
  border-left: 2px solid transparent;
  border-radius: 0.25rem 0.45rem 0.45rem 0.25rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.5;
  transition:
    background 0.15s,
    color 0.15s;
}
.nav-link:hover {
  background: var(--panel-2);
  color: var(--text);
}
.nav-link.active {
  border-left-color: var(--cyan);
  background: var(--accent-soft);
  color: var(--cyan);
}
.nav-num {
  flex: 0 0 1.3rem;
  color: var(--faint);
  font: 400 0.625rem/1.5 var(--font-mono);
}
.nav-link.active .nav-num {
  color: var(--cyan);
}
.sidebar-home {
  display: block;
  min-height: 2.75rem;
  margin-top: 1.5rem;
  padding: 1rem 0.6rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.75rem;
}
.nav-empty {
  padding: 0.5rem 0.6rem 1rem;
  color: var(--faint);
  font-size: 0.8125rem;
}
.reader-page main {
  width: calc(100% - var(--sidebar));
  max-width: 81rem;
  min-width: 0;
  margin-left: var(--sidebar);
  padding: 0 clamp(2rem, 4vw, 5rem) max(3rem, env(safe-area-inset-bottom, 0px));
}
.reader-hero {
  padding: 2rem 0 2.75rem;
  border-bottom: 1px solid var(--line);
}
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  margin-bottom: 1.8rem;
  color: var(--faint);
  font-size: 0.75rem;
}
.reader-hero h1 {
  font-size: clamp(2.75rem, 4.75vw, 4.75rem);
  max-width: 16ch;
}
.reader-hero h1 span:first-child {
  color: var(--cyan);
}
.title-period {
  color: var(--cyan);
}
.reader-hero .hero-copy {
  max-width: 46rem;
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}
.reader-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 1.25rem;
  color: var(--faint);
  font: 400 0.6875rem/1.6 var(--font-mono);
}
.reader-stats span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.reader-stats span::before {
  content: '';
  width: 0.25rem;
  height: 0.25rem;
  border-radius: 50%;
  background: var(--cyan);
}
.reader-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.65rem;
}
.reader-hero .mental-model {
  margin: 2rem 0 0;
}
.mental-model {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem;
  margin-block: 1.5rem;
}
.step {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--panel);
}
.step-num,
.step .step-num {
  color: var(--cyan);
  font: 500 0.625rem/1.5 var(--font-mono);
}
.step strong,
.step b {
  display: block;
  margin-top: 0.65rem;
  color: var(--text);
  font-size: 0.8125rem;
  line-height: 1.5;
}
.step > span:last-child {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.6;
}
.related-guides {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  margin-top: 2.5rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
}
.related-guides > span {
  width: 100%;
  margin-bottom: 0.5rem;
  color: var(--faint);
  font: 500 0.6875rem/1.5 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.related-guides a {
  display: inline-flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 2.75rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  color: var(--text);
  font-size: 0.8125rem;
}
.related-guides a:hover {
  border-color: var(--cyan);
}
.related-guides a span {
  color: var(--cyan);
}
.scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgb(0 0 0 / 0.6);
}
.sql-only .code-card:not([data-language='sql']) {
  display: none;
}
@media (min-width: 1600px) {
  .reader-page .pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
  .reader-page.sql-only .pair {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 1200px) {
  .mental-model {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 980px) {
  .reader-menu {
    display: grid;
  }
  .reader-page .header-divider {
    display: none;
  }
  .reader-page .header-context {
    display: none;
  }
  .sidebar {
    inset: 0 auto 0 0;
    z-index: 70;
    width: min(22rem, calc(100vw - 2.5rem));
    height: 100vh;
    height: 100dvh;
    padding-top: max(0.75rem, env(safe-area-inset-top, 0px));
    visibility: hidden;
    transform: translateX(-105%);
    transition:
      transform 0.2s ease,
      visibility 0.2s;
    box-shadow: var(--shadow);
  }
  .nav-open .sidebar {
    visibility: visible;
    transform: translateX(0);
  }
  .nav-open .scrim {
    display: block;
  }
  .drawer-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: sticky;
    top: -0.75rem;
    z-index: 2;
    padding: 0.35rem 0.25rem 0.75rem;
    margin-bottom: 0.75rem;
    background: var(--sidebar-bg);
  }
  .drawer-heading strong {
    font-size: 0.9375rem;
  }
  .reader-page main {
    width: 100%;
    max-width: 62rem;
    margin: 0 auto;
    padding-inline: clamp(1.25rem, 5vw, 3rem);
  }
  .reader-hero h1 {
    font-size: clamp(3rem, 7.5vw, 4.75rem);
  }
}
@media (max-width: 720px) {
  .reader-page .site-header-inner {
    padding-inline: 1rem;
    gap: 0.65rem;
  }
  .reader-page .brand-wordmark {
    display: none;
  }
  .reader-page .site-mark {
    width: 2rem;
    height: 2rem;
  }
  .reader-page .header-context {
    display: block;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: var(--text);
    font: 600 0.875rem/1.4 var(--font-sans);
  }
  .reader-page .all-guides-link {
    display: none;
  }
  .reader-page main {
    padding-inline: max(1.2rem, env(safe-area-inset-left, 0px))
      max(1.2rem, env(safe-area-inset-right, 0px));
  }
  .reader-hero {
    padding: 1.25rem 0 1.75rem;
  }
  .back-link {
    margin-bottom: 1.5rem;
  }
  .reader-hero h1 {
    font-size: clamp(2.6rem, 11vw, 4.2rem);
    overflow-wrap: anywhere;
  }
  .reader-hero .hero-copy {
    font-size: 0.9375rem;
    margin-top: 1.2rem;
  }
  .reader-stats {
    gap: 0.6rem 1rem;
    font-size: 0.625rem;
  }
  .reader-tools .btn {
    flex-grow: 1;
  }
  .reader-hero .mental-model {
    margin-top: 1.5rem;
  }
  .step {
    padding: 0.85rem;
  }
  .section-search input {
    font-size: 1rem;
  }
  .nav-link {
    font-size: 0.875rem;
  }
}
@media (max-width: 359px) {
  .mental-model {
    grid-template-columns: 1fr;
  }
  .reader-hero h1 {
    font-size: 2.4rem;
  }
}

/* Chapter navigation is available on every screen, including desktop. */
.reader-page .reader-menu {
  display: grid;
}
.drawer-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 0.25rem 0 0.75rem;
  margin-bottom: 0.6rem;
  background: var(--sidebar-bg);
}
.drawer-heading strong {
  font-size: 0.875rem;
}
.guide-overview-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.6rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  font-size: 0.8125rem;
}
.guide-overview-link span {
  color: var(--faint);
  font-size: 0.625rem;
}
.guide-overview-link[aria-current] {
  background: var(--accent-soft);
}
.nav-chapter-row {
  display: flex;
  align-items: start;
  gap: 0.2rem;
}
.chapter-link {
  display: flex;
  align-items: baseline;
  flex: 1;
  gap: 0.6rem;
  min-width: 0;
  min-height: 2.75rem;
  padding: 0.65rem 0.45rem;
  border-radius: 0.4rem;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--text);
  font-weight: 650;
}
.chapter-link[aria-current] {
  background: var(--accent-soft);
  color: var(--cyan);
}
.chapter-toggle {
  display: grid;
  place-items: center;
  flex: 0 0 2.75rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 0;
  border-radius: 0.4rem;
  color: var(--muted);
  background: transparent;
}
.chapter-toggle:hover {
  background: var(--panel-2);
}
.chapter-toggle[aria-expanded='true'] span {
  transform: rotate(180deg);
}
.chapter-topic-links {
  margin-left: 0.6rem;
  border-left: 1px solid var(--line);
}
.chapter-topic-links .nav-link {
  font-size: 0.75rem;
  margin: 0.15rem 0 0.15rem 0.2rem;
}
.chapter-hero h1 {
  font-size: clamp(2.3rem, 4vw, 3.5rem);
  max-width: 28ch;
}
.chapter-jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.65rem;
  margin-top: 1.5rem;
}
.chapter-jump-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  padding: 0.4rem 0.65rem;
  color: var(--muted);
  font-size: 0.75rem;
}
.chapter-jump-links a:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.chapter-collection {
  padding-top: 2rem;
}
.chapter-collection-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.chapter-collection-heading h2 {
  font-size: 1.5rem;
}
.chapter-collection-heading p {
  color: var(--faint);
  font-size: 0.75rem;
}
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}
.chapter-grid > .ad-slot {
  grid-column: 1 / -1;
  margin-block: 1.5rem;
}
.chapter-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: var(--panel);
}
.chapter-card h3 {
  margin-top: 0.8rem;
  font-size: 1.35rem;
}
.chapter-card h3 a {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 2.75rem;
  color: var(--text);
}
.chapter-card h3 a:hover {
  color: var(--cyan);
}
.chapter-card h3 a span {
  color: var(--cyan);
}
.chapter-card p {
  margin: 0.75rem 0 1rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.8;
}
.chapter-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.chapter-card li + li {
  border-top: 1px solid var(--line-soft);
}
.chapter-card li a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.5rem 0;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.65;
}
.chapter-card li a:hover {
  color: var(--cyan);
}
.chapter-pagination {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.chapter-pagination a {
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: var(--panel);
}
.chapter-pagination a:last-child {
  text-align: right;
}
.chapter-pagination span {
  color: var(--faint);
  font-size: 0.6875rem;
}
.chapter-pagination strong {
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.6;
}
.chapter-pagination a:hover {
  border-color: var(--cyan);
}
@media (min-width: 981px) {
  :root[data-sidebar-collapsed='true'] .reader-page .sidebar {
    visibility: hidden;
    transform: translateX(-105%);
  }
  :root[data-sidebar-collapsed='true'] .reader-page main {
    width: 100%;
    max-width: 81rem;
    margin-inline: auto;
  }
}
@media (max-width: 720px) {
  .chapter-grid {
    grid-template-columns: 1fr;
  }
  .chapter-card {
    padding: 1.2rem;
  }
  .chapter-hero h1 {
    font-size: clamp(2.1rem, 9vw, 3rem);
  }
  .chapter-pagination {
    grid-template-columns: 1fr;
  }
  .chapter-topic-links .nav-link {
    font-size: 0.8125rem;
  }
}
.overview-primer,
.overview-quick-topics {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 0 1rem;
  background: var(--panel);
}
.overview-primer > summary,
.overview-quick-topics > summary {
  padding-block: 0.75rem;
  min-height: 2.75rem;
  color: var(--muted);
  font-size: 0.8125rem;
}
.overview-primer .mental-model {
  margin: 0.5rem 0 1rem;
}
.overview-quick-topics .topic-shortcuts {
  margin-block: 0.5rem 1rem;
}
.chapter-topic-list > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-block: 0.7rem;
  min-height: 2.75rem;
  color: var(--cyan);
  font-size: 0.75rem;
  border-top: 1px solid var(--line-soft);
}
.chapter-topic-list > summary::-webkit-details-marker {
  display: none;
}
.chapter-topic-list[open] > summary span {
  transform: rotate(180deg);
}
.guide-references {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8125rem;
}
.guide-references a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  margin-inline: 0.4rem;
}

/* Imported guide content uses these shared, semantic components. */
.section {
  margin-top: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line-soft);
}
.section:last-child {
  border-bottom: 0;
}
.section-head {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  align-items: start;
  gap: 0.8rem;
  margin-bottom: 1.75rem;
}
.section-number {
  padding-top: 0.35rem;
  color: var(--cyan);
  font: 500 0.6875rem/1.5 var(--font-mono);
  white-space: nowrap;
}
.section h2 {
  font-size: clamp(1.65rem, 2.5vw, 2.4rem);
  text-wrap: balance;
}
.section h3 {
  margin: 2rem 0 0.8rem;
  font-weight: 650;
}
.section h4 {
  margin: 1.35rem 0 0.5rem;
  font-weight: 650;
}
.section p {
  max-width: 54rem;
  margin: 0.8rem 0;
  color: var(--muted);
  font-size: 0.9375rem;
}
.section ul,
.section ol {
  max-width: 54rem;
  padding-left: 1.3rem;
  margin-block: 1rem;
}
.section li {
  color: var(--muted);
  font-size: 0.9375rem;
}
.section li + li {
  margin-top: 0.4rem;
}
.section strong,
.section b {
  color: var(--text);
}
.section .lead,
p.section-intro {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.975rem;
}
div.section-intro {
  margin: 0;
  font-size: inherit;
  max-width: none;
}
.section a {
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-color: color-mix(in srgb, var(--cyan) 35%, transparent);
}
.section a:hover {
  text-decoration-color: currentColor;
}
.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0;
}
.content-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.card {
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.card h3,
.card h4 {
  margin-top: 0;
}
.card p {
  margin-bottom: 0;
  font-size: 0.875rem;
}
.card > b {
  display: block;
  margin-bottom: 0.4rem;
}
.card > span {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
}
.mini-label {
  color: var(--cyan);
  font: 600 0.6875rem/1.5 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}
.code-card {
  min-width: 0;
  overflow: hidden;
  margin: 1.3rem 0 1.65rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--code-bg);
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  min-height: 3.2rem;
  padding: 0.4rem 0.5rem 0.4rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
}
.code-caption {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem 0.8rem;
  min-width: 0;
}
.code-language {
  flex-shrink: 0;
  color: var(--cyan);
  font: 600 0.625rem/1.5 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.code-title {
  color: var(--muted);
  font: 500 0.75rem/1.5 var(--font-mono);
  overflow-wrap: anywhere;
}
.copy {
  flex: 0 0 4.5rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: var(--panel);
  color: var(--muted);
  font: 500 0.6875rem/1.5 var(--font-mono);
}
.copy:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.copy:disabled {
  cursor: progress;
  opacity: 0.7;
}
pre {
  max-width: 100%;
  margin: 0;
  overflow: auto;
  padding: 1.25rem;
  color: var(--code-text);
  font-size: 0.8125rem;
  line-height: 1.8;
  tab-size: 4;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
  overscroll-behavior-inline: contain;
}
pre code {
  display: block;
  white-space: pre;
  background: none;
  font: inherit;
}
.clipboard-buffer {
  position: fixed;
  inset: 0 auto auto -10000px;
  font-size: 16px;
}
.note,
.callout {
  --note-color: var(--cyan);
  margin: 1.25rem 0;
  padding: 1.1rem 1.25rem;
  border: 1px solid color-mix(in srgb, var(--note-color) 20%, var(--line));
  border-left: 3px solid var(--note-color);
  border-radius: 0.25rem 0.65rem 0.65rem 0.25rem;
  background: color-mix(in srgb, var(--note-color) 4%, var(--panel));
  color: var(--muted);
}
.note.warn,
.callout.warn {
  --note-color: var(--yellow);
}
.callout.danger {
  --note-color: var(--red);
}
.section :is(.note, .callout) > .note-title {
  display: block;
  margin: 0 0 0.5rem;
  color: var(--text);
  font: 650 0.9375rem/1.5 var(--font-sans);
  letter-spacing: normal;
  text-transform: none;
}
.note-body {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}
.section .note-body p {
  font-size: inherit;
  margin: 0.65rem 0;
}
.note-body > :first-child {
  margin-top: 0;
}
.note-body > :last-child {
  margin-bottom: 0;
}
.note-body :is(b, strong) {
  display: inline;
  margin: 0;
  font: inherit;
  font-weight: 650;
}
.subtopic {
  margin: 2rem 0 0.75rem;
}
.subtopic h3 {
  margin: 0 0 0.65rem;
}
.subtopic p {
  margin: 0;
}
.request-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin: 1.5rem 0;
}
.request-flow span {
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  font-size: 0.8rem;
}
.request-flow i {
  color: var(--cyan);
  font-style: normal;
}
.table-wrap {
  max-width: 100%;
  overflow: auto;
  margin: 1.2rem 0 1.7rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--panel);
  overscroll-behavior-inline: contain;
}
table {
  width: 100%;
  min-width: 0;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
table.table-wide {
  min-width: 40rem;
}
th,
td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: top;
}
tr:last-child td {
  border-bottom: 0;
}
th {
  background: var(--panel-2);
  color: var(--faint);
  font: 600 0.6875rem/1.6 var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
td {
  color: var(--muted);
}
td:first-child {
  color: var(--table-key);
}
td code {
  overflow-wrap: anywhere;
}
.tag,
.badge,
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  background: var(--panel-2);
  color: var(--muted);
  font: 500 0.6875rem/1.4 var(--font-mono);
}
.tag.default {
  color: var(--green);
}
.tag.optional {
  color: var(--purple);
}
.tag.advanced {
  color: var(--orange);
}
.section details {
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}
.section summary {
  min-height: 2.75rem;
  padding: 0.85rem 1rem;
  color: var(--text);
  font-weight: 600;
}
.section details[open] > summary {
  border-bottom: 1px solid var(--line-soft);
}
.details-body {
  padding: 0.3rem 1.1rem 1rem;
  color: var(--muted);
}
.api-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.8rem 0 1.4rem;
}
.api-cloud code {
  font-size: 0.75rem;
}
.hljs-keyword,
.hljs-literal,
.hljs-selector-tag {
  color: var(--syntax-keyword);
  font-weight: 600;
}
.hljs-string,
.hljs-regexp,
.hljs-addition {
  color: var(--syntax-string);
}
.hljs-comment,
.hljs-quote {
  color: var(--syntax-comment);
  font-style: italic;
}
.hljs-number,
.hljs-symbol,
.hljs-bullet {
  color: var(--syntax-number);
}
.hljs-meta,
.hljs-title.function_,
.hljs-built_in {
  color: var(--syntax-macro);
}
.hljs-title.class_,
.hljs-type,
.hljs-deletion {
  color: var(--syntax-type);
}
.hljs-attr,
.hljs-attribute,
.hljs-name,
.hljs-variable,
.hljs-selector-attr {
  color: var(--syntax-key);
}
.hljs-title,
.hljs-section {
  color: var(--blue);
}
.hljs-params,
.hljs-subst,
.hljs-punctuation {
  color: var(--code-text);
}
@media (max-width: 1100px) {
  .content-grid,
  .content-grid.two {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  }
}
@media (max-width: 720px) {
  .section {
    margin-top: 2.25rem;
    padding-bottom: 1.75rem;
  }
  .section-head {
    grid-template-columns: 1fr;
    gap: 0.65rem;
    margin-bottom: 1.3rem;
  }
  .section-number {
    padding-top: 0;
  }
  .section h2 {
    font-size: 1.75rem;
    overflow-wrap: anywhere;
  }
  .content-grid,
  .content-grid.two,
  .content-grid.three {
    grid-template-columns: minmax(0, 1fr);
  }
  .code-head {
    padding-left: 0.85rem;
  }
  pre {
    font-size: 0.75rem;
    padding: 1rem;
  }
  .request-flow {
    flex-direction: column;
    align-items: stretch;
  }
  .request-flow i {
    transform: rotate(90deg);
    align-self: center;
  }
  .note,
  .callout {
    padding: 1rem;
  }
}

.breadcrumbs {
  margin: 0 0 2rem;
  color: var(--faint);
  font-size: 0.75rem;
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}
.breadcrumbs li:not(:last-child)::after {
  content: '/';
  color: var(--line);
}
.breadcrumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--muted);
}
.breadcrumbs li[aria-current] {
  color: var(--faint);
}
.reader-stats time {
  margin-left: -0.3rem;
}
.topic-shortcuts {
  margin-top: 2rem;
}
.topic-shortcuts > span {
  display: block;
  margin-bottom: 0.8rem;
}
.topic-shortcuts > div {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}
.topic-shortcuts a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 2.75rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.5;
}
.topic-shortcuts a:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.topic-shortcuts a span {
  color: var(--cyan);
  flex-shrink: 0;
}
.section h2 .section-permalink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  margin-left: 0.3rem;
  color: var(--faint);
  font-size: 0.55em;
  text-decoration: none;
  vertical-align: middle;
  opacity: 0;
}
.section h2:hover .section-permalink,
.section-permalink:focus-visible {
  opacity: 1;
}
.related-topics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
}
.related-topics > span {
  grid-column: 1 / -1;
}
.related-topics a {
  display: block;
  padding: 1rem;
}
.related-topics a strong {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.5;
}
.related-topics a small {
  display: block;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.7;
}
.collection-footer > nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.3rem 1rem;
}
.collection-footer nav a,
.collection-footer nav button {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
}
.collection-footer nav a:hover,
.collection-footer nav button:hover {
  color: var(--cyan);
}
.summary-languages > a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
}
.summary-languages > a:hover {
  color: var(--cyan);
}
.language-hero {
  max-width: 52rem;
  padding: 2rem 0 3rem;
}
.language-hero h1 {
  font-size: clamp(3rem, 5.5vw, 4.5rem);
}
.language-hero h1 > span {
  color: var(--cyan);
}
.language-hero > p {
  margin-top: 1.5rem;
  color: var(--muted);
  max-width: 42rem;
}
.information-main {
  max-width: 62rem;
  margin-inline: auto;
  padding: 2rem clamp(1.25rem, 4vw, 4rem) 0;
}
.information-main h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}
.information-copy {
  margin-top: 2.5rem;
}
.information-copy h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.35rem;
}
.information-copy p {
  margin: 1rem 0;
  color: var(--muted);
  font-size: 0.9375rem;
}
.information-copy .information-lead {
  font-size: 1.1rem;
}
.information-copy a {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
@media (max-width: 720px) {
  .breadcrumbs {
    margin-bottom: 1.3rem;
  }
  .topic-shortcuts > div {
    grid-template-columns: 1fr;
  }
  .related-topics {
    grid-template-columns: 1fr;
  }
  .section h2 .section-permalink {
    opacity: 1;
  }
  .collection-footer > nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }
  .language-hero {
    padding-block: 1.25rem 2rem;
  }
  .catalog-toolbar > a {
    font-size: 0.875rem;
  }
}
@media print {
  .topic-shortcuts,
  .breadcrumbs,
  .section-permalink {
    display: none !important;
  }
}

/* Slots sit between complete sections, with room around navigation and controls. */
.ad-slot {
  container: advertisement / inline-size;
  margin-block: 3.5rem;
  padding-block: 1.25rem;
  width: 100%;
  border-block: 1px solid var(--line-soft);
  text-align: center;
}
.ad-label {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--faint);
  font: 400 0.625rem/1.5 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ad-frame {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 250px;
}
.ad-unit,
.ad-preview {
  display: block;
  width: 250px;
  height: 250px;
  margin: 0 auto;
}
.ad-preview {
  display: none;
  place-items: center;
  border: 1px dashed var(--line);
  background: var(--panel-2);
  color: var(--faint);
  font-size: 0.75rem;
}
.ad-slot[data-ad-preview='true'] .ad-preview {
  display: grid;
}
@container advertisement (min-width: 300px) {
  .ad-unit,
  .ad-preview {
    width: 300px;
    height: 250px;
  }
}
@container advertisement (min-width: 336px) {
  .ad-unit,
  .ad-preview {
    width: 336px;
    height: 280px;
  }
  .ad-frame {
    min-height: 280px;
  }
}
@container advertisement (min-width: 468px) {
  .ad-unit,
  .ad-preview {
    width: 468px;
    height: 60px;
  }
  .ad-frame {
    min-height: 60px;
  }
}
@container advertisement (min-width: 728px) {
  .ad-unit,
  .ad-preview {
    width: 728px;
    height: 90px;
  }
  .ad-frame {
    min-height: 90px;
  }
}
@media print {
  .ad-slot {
    display: none !important;
  }
}

@media print {
  :root,
  :root[data-theme='dark'] {
    color-scheme: light;
    --bg: #fff;
    --panel: #fff;
    --panel-2: #f2f4f7;
    --text: #172033;
    --muted: #334155;
    --faint: #51647c;
    --cyan: #087d87;
    --code-bg: #f8fafc;
    --code-text: #172033;
    --line: #cbd5e1;
    --line-soft: #e2e8f0;
    --inline-code: #1e3a5f;
    --table-key: #172554;
    --accent-soft: #e6f4f3;
    --syntax-keyword: #7c3aed;
    --syntax-string: #0f766e;
    --syntax-comment: #51647c;
    --syntax-number: #b45309;
    --syntax-macro: #0369a1;
    --syntax-type: #be123c;
    --syntax-key: #1d4ed8;
    --blue: #2563eb;
    --yellow: #916600;
    --red: #b42e4d;
  }
  body {
    padding-top: 0;
    background: white;
    color: #172033;
    font-size: 10pt;
  }
  .site-header,
  .sidebar,
  .scrim,
  .skip-link,
  .reader-tools,
  .copy,
  .back-link,
  .related-guides,
  .collection-footer,
  .catalog-controls,
  .hero-link {
    display: none !important;
  }
  .reader-page main,
  .home-main {
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
  }
  .reader-hero {
    padding-top: 0;
  }
  .reader-hero h1 {
    font-size: 36pt;
  }
  .section {
    margin-top: 1.5rem;
    padding-bottom: 1rem;
  }
  .section h2 {
    font-size: 22pt;
  }
  .code-card,
  .callout,
  .note,
  .catalog-card {
    break-inside: avoid;
    box-shadow: none;
  }
  pre {
    white-space: pre-wrap;
    overflow: visible;
    font-size: 8pt;
  }
  pre code {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }
  table,
  table.table-wide {
    min-width: 0;
    font-size: 8pt;
  }
  .table-wrap {
    overflow: visible;
  }
  .pair {
    display: block;
  }
  .section-head {
    break-after: avoid;
  }
  .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .catalog-card[hidden] {
    display: flex !important;
  }
  .catalog-empty {
    display: none !important;
  }
}