/* pacifica-obd documentation site — stylesheet.
 *
 * Self-contained: no web fonts, no CDN, no @import, no build step.  Every
 * colour is a custom property, so each theme is one declaration block, and
 * code blocks read only the --code-* / --tk-* variables so a single block (the
 * hero terminal) can switch palette locally.
 *
 *   1. tokens          6. prose           11. callouts
 *   2. base            7. tables          12. hero, buttons, cards
 *   3. top bar         8. code            13. lists, footers, pager
 *   4. search          9. syntax colours  14. responsive
 *   5. layout & nav   10. page toc        15. no-js, motion, print
 */

/* ============================================================== 1. tokens == */

:root {
  color-scheme: light;

  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --panel: #ffffff;
  --panel-soft: #f4f6f9;
  --panel-raised: #ffffff;
  --text: #111827;
  --text-soft: #374151;
  --muted: #5b6474;
  --border: #e4e7ec;
  --border-strong: #cfd5de;

  --accent: #2451d6;
  --accent-ink: #1d43b8;
  --accent-soft: color-mix(in srgb, var(--accent) 9%, transparent);
  --accent-line: color-mix(in srgb, var(--accent) 35%, transparent);
  --on-accent: #ffffff;
  --signal: #e8a317; /* the "check engine" amber, used only as decoration */

  --note: #2451d6;
  --ok: #127a46;
  --warn: #9a5b00;
  --danger: #b42318;
  --neutral: #5b6474;

  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.05);
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 8px 24px -6px rgba(17, 24, 39, 0.1);
  --shadow-lg: 0 2px 4px rgba(17, 24, 39, 0.04), 0 24px 56px -12px rgba(17, 24, 39, 0.22);
  --backdrop: rgba(15, 20, 30, 0.42);

  --code-bg: #f6f8fb;
  --code-head-bg: #eef1f6;
  --code-border: #e1e6ee;
  --code-text: #1a2230;
  --code-muted: #5c6878;
  --code-button-bg: #ffffff;
  --code-button-border: #d3d9e3;

  --tk-comment: #5c6878;
  --tk-keyword: #7c3aed;
  --tk-string: #0f7a4a;
  --tk-number: #b45309;
  --tk-function: #1d4ed8;
  --tk-builtin: #0e7490;
  --tk-tag: #1e40af;
  --tk-attr: #92400e;
  --tk-operator: #4b5563;
  --tk-deleted: #b91c1c;
  --tk-inserted: #0f7a4a;

  --radius-lg: 16px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;

  --topbar-height: 60px;
  --sidebar-width: 272px;
  --toc-width: 224px;
  --content-max: 50rem;
  --measure: 72ch;
  --shell-max: 92rem;
  --tap: 44px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Text", "Segoe UI", Inter,
    Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Display", "Segoe UI",
    Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Code", "JetBrains Mono", Menlo,
    Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0b0f16;
  --bg-soft: #0f141d;
  --panel: #111723;
  --panel-soft: #161d2a;
  --panel-raised: #18202e;
  --text: #e7ecf3;
  --text-soft: #bac4d2;
  --muted: #8d99ab;
  --border: #212a39;
  --border-strong: #303b4e;

  --accent: #86a8ff;
  --accent-ink: #a3bdff;
  --accent-soft: color-mix(in srgb, var(--accent) 13%, transparent);
  --accent-line: color-mix(in srgb, var(--accent) 40%, transparent);
  --on-accent: #0b1220;
  --signal: #f2b84b;

  --note: #86a8ff;
  --ok: #5fd49a;
  --warn: #f2b84b;
  --danger: #ff8b80;
  --neutral: #8d99ab;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 10px 28px -8px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 2px 4px rgba(0, 0, 0, 0.3), 0 28px 64px -12px rgba(0, 0, 0, 0.7);
  --backdrop: rgba(2, 5, 10, 0.62);

  --code-bg: #0e131b;
  --code-head-bg: #131a25;
  --code-border: #1f2836;
  --code-text: #e4e9f0;
  --code-muted: #8794a7;
  --code-button-bg: #1a2230;
  --code-button-border: #2c3747;

  --tk-comment: #8794a7;
  --tk-keyword: #c4a7ff;
  --tk-string: #86dba8;
  --tk-number: #f7b37a;
  --tk-function: #8db5ff;
  --tk-builtin: #6fd6e8;
  --tk-tag: #8db5ff;
  --tk-attr: #f0c674;
  --tk-operator: #aeb8c6;
  --tk-deleted: #ff9a9a;
  --tk-inserted: #86dba8;
}

/* ================================================================ 2. base == */

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-height) + 1.25rem);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body.has-drawer {
  overflow: hidden;
}

::selection {
  background: color-mix(in srgb, var(--accent) 24%, transparent);
}

a {
  color: var(--accent-ink);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--accent-line);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  left: 0.75rem;
  top: 0.75rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
  color: var(--on-accent);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-width: 38px;
  height: 38px;
  padding: 0 0.55rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 0.875rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.icon-button:hover {
  background: var(--panel-soft);
  color: var(--text);
}

.icon-button svg {
  display: block;
  width: 20px;
  height: 20px;
  flex: none;
}

.site-icon-svg {
  display: block;
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0.1em 0.38em;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius-xs);
  background: var(--panel-soft);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.78em;
  font-weight: 500;
  line-height: 1.35;
  text-align: center;
  white-space: nowrap;
}

/* ============================================================= 3. top bar == */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
}

/* The frosted glass lives on a pseudo-element: a backdrop-filter on .topbar
 * itself would become the containing block of the fixed search overlay. */
.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
}

.topbar-inner {
  height: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  margin-right: auto;
  padding: 0.25rem 0.35rem 0.25rem 0;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
}

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

/* The mark is a tiny OBD-II (J1962) connector: a trapezoid with two pin rows. */
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--text);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--bg) 12%, transparent), var(--shadow-sm);
}

.brand-mark span {
  width: 20px;
  height: 12px;
  background:
    radial-gradient(circle, var(--text) 1.1px, transparent 1.5px) 1px 1px / 4.5px 5px repeat-x,
    radial-gradient(circle, var(--text) 1.1px, transparent 1.5px) 3.25px 6px / 4.5px 5px repeat-x,
    var(--bg);
  clip-path: polygon(0 0, 100% 0, 86% 100%, 14% 100%);
  border-radius: 2px;
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 2px var(--bg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.brand-tagline {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.75rem;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.github-link {
  color: var(--text-soft);
}

.theme-toggle svg {
  transition: transform 0.35s var(--ease);
}

.theme-toggle:hover svg {
  transform: rotate(18deg);
}

.github-label {
  font-weight: 600;
}

/* Theme toggle shows the current theme's icon; the nav toggle swaps on state. */
[data-theme="light"] .icon-dark,
[data-theme="dark"] .icon-light {
  display: none;
}

.icon-light,
.icon-dark,
.icon-open,
.icon-close {
  display: inline-flex;
}

.nav-toggle {
  display: none;
}

.nav-toggle .icon-close,
.nav-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: inline-flex;
}

/* ============================================================== 4. search == */

.search {
  flex: 0 1 17rem;
  min-width: 0;
}

/* The toggle doubles as the desktop search field: a pill with a shortcut. */
.search-toggle {
  width: 100%;
  justify-content: flex-start;
  gap: 0.55rem;
  padding: 0 0.45rem 0 0.75rem;
  border-color: var(--border);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
}

.search-toggle:hover {
  border-color: var(--border-strong);
  background: var(--panel);
  color: var(--text-soft);
}

.search-toggle svg {
  width: 17px;
  height: 17px;
}

.search-toggle-label {
  flex: 1;
  text-align: left;
}

.search-toggle-kbd {
  min-width: 0;
  padding: 0.2em 0.45em;
  border-bottom-width: 1px;
  background: var(--panel);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

/* Open search is a command palette: .search becomes the dimmed backdrop and
 * the panel floats above the page.  Clicking the backdrop closes it (site.js). */
.search.is-open::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 70;
  background: var(--backdrop);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: fade-in 0.15s ease;
}

.search-panel {
  position: fixed;
  z-index: 71;
  top: max(4.5rem, 11vh);
  left: 50%;
  width: min(42rem, calc(100vw - 2rem));
  max-height: min(36rem, calc(100vh - 8rem));
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--panel-raised);
  box-shadow: var(--shadow-lg);
  animation: palette-in 0.18s var(--ease);
}

.search-field {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: none;
  padding: 0 0.6rem 0 1.1rem;
  border-bottom: 1px solid var(--border);
}

.search-field > svg {
  width: 20px;
  height: 20px;
  flex: none;
  color: var(--accent);
}

.search-field input {
  flex: 1;
  min-width: 0;
  height: 3.6rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1.08rem;
}

.search-field input::placeholder {
  color: var(--muted);
}

.search-field input:focus,
.search-field input:focus-visible {
  outline: none;
}

.search-field input::-webkit-search-cancel-button {
  display: none;
}

.search-field:focus-within {
  box-shadow: inset 0 -2px 0 var(--accent);
}

.search-close {
  width: var(--tap);
  height: var(--tap);
  flex: none;
}

.search-results {
  flex: 1 1 auto;
  min-height: 0;
  margin: 0;
  padding: 0.5rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
}

.search-results:empty {
  display: none;
}

.search-result + .search-result {
  margin-top: 2px;
}

.search-result a {
  position: relative;
  display: block;
  padding: 0.65rem 0.85rem 0.7rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
}

.search-result a:hover {
  background: var(--panel-soft);
}

.search-result[aria-selected="true"] a {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

.search-result[aria-selected="true"] a::after {
  content: "↵";
  position: absolute;
  top: 0.65rem;
  right: 0.85rem;
  color: var(--accent-ink);
  font-size: 0.85rem;
}

.search-result-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.15rem 0.4rem;
  padding-right: 1.5rem;
  font-size: 0.92rem;
  line-height: 1.4;
}

.search-result-page {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
}

.search-result-sep {
  color: var(--muted);
  font-size: 0.8rem;
}

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

.search-result-snippet {
  display: -webkit-box;
  margin-top: 0.2rem;
  overflow: hidden;
  color: var(--text-soft);
  font-size: 0.84rem;
  line-height: 1.5;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.search-result mark {
  padding: 0 0.1em;
  border-radius: 3px;
  background: color-mix(in srgb, var(--signal) 32%, transparent);
  color: inherit;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--signal) 80%, var(--text));
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2px;
}

.search-hint {
  flex: none;
  margin: 0;
  padding: 0.6rem 1.1rem;
  border-top: 1px solid var(--border);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.search-hint kbd {
  margin: 0 0.1em;
  font-size: 0.7rem;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
}

@keyframes palette-in {
  from {
    opacity: 0;
    transform: translate(-50%, -6px) scale(0.985);
  }
}

/* ======================================================= 5. layout & nav == */

.shell {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--toc-width);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: var(--topbar-height);
  height: calc(100vh - var(--topbar-height));
  border-right: 1px solid var(--border);
}

.sidebar-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem 1rem 1.25rem 1.25rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.sidebar-top {
  display: none;
}

.sidebar-title {
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.site-nav ul {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-home {
  margin-bottom: -0.4rem;
}

.nav-group {
  display: flex;
  flex-direction: column;
}

.nav-group-title {
  margin: 0 0 0.4rem;
  padding: 0 0.7rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  line-height: 1.5;
  text-transform: uppercase;
}

.nav-group--more > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  list-style: none;
}

.nav-group--more > summary::-webkit-details-marker {
  display: none;
}

.nav-group--more > summary::after {
  content: "";
  width: 7px;
  height: 7px;
  margin-right: 0.2rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
}

.nav-group--more[open] > summary::after {
  transform: rotate(45deg);
}

.nav-group--more > summary:hover {
  color: var(--text);
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 34px;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 0.9rem;
  line-height: 1.35;
  text-decoration: none;
  transition: background-color 0.12s ease, color 0.12s ease;
}

.nav-link:hover {
  background: var(--panel-soft);
  color: var(--text);
}

.nav-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 600;
}

.nav-link.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
}

.nav-link--home {
  font-weight: 600;
}

.sidebar-foot {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin-top: auto;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 34px;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: none;
}

.sidebar-link:hover {
  background: var(--panel-soft);
  color: var(--text);
}

.sidebar-link svg {
  width: 16px;
  height: 16px;
  flex: none;
}

.content {
  min-width: 0;
  padding: 2.25rem 3rem 3.5rem;
}

.content:focus {
  outline: none;
}

.content-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.toc-column {
  position: sticky;
  top: var(--topbar-height);
  max-height: calc(100vh - var(--topbar-height));
  padding: 2.4rem 1.25rem 2rem 0.5rem;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: var(--backdrop);
  animation: fade-in 0.2s ease;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.breadcrumbs > span[aria-hidden],
.breadcrumbs > span:not([class]):not([aria-current]) {
  color: var(--border-strong);
}

.crumb-group {
  color: var(--accent-ink);
  font-weight: 600;
}

.breadcrumbs [aria-current="page"] {
  color: var(--text-soft);
}

/* ============================================================== 6. prose == */

.prose {
  font-size: 1rem;
  overflow-wrap: break-word;
}

.prose > :first-child {
  margin-top: 0;
}

.prose > p,
.prose > ul,
.prose > ol,
.prose > blockquote,
.prose > dl,
.prose li > p {
  max-width: var(--measure);
}

.prose p,
.prose li,
.prose dd {
  color: var(--text-soft);
}

.prose p {
  margin: 0 0 1.1em;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5 {
  color: var(--text);
  font-family: var(--font-display);
  text-wrap: balance;
}

.prose h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 1.55rem + 1.5vw, 2.6rem);
  font-weight: 750;
  letter-spacing: -0.028em;
  line-height: 1.12;
}

.prose h2 {
  margin: 3.25rem 0 0.9rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border);
  font-size: clamp(1.4rem, 1.2rem + 0.6vw, 1.65rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.prose h1 + h2,
.prose > h2:first-child,
.prose .hero + h2 {
  border-top: 0;
  padding-top: 0;
}

.prose h3 {
  margin: 2.3rem 0 0.6rem;
  font-size: 1.2rem;
  font-weight: 650;
  letter-spacing: -0.012em;
  line-height: 1.35;
}

.prose h4 {
  margin: 1.9rem 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.4;
}

.prose h5 {
  margin: 1.5rem 0 0.4rem;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.prose h2 + h3 {
  margin-top: 1.4rem;
}

/* Leading paragraph under the page title (site.js may slot the TOC between). */
.prose > h1 + p,
.prose > h1 + .page-toc--mobile + p {
  color: var(--text-soft);
  font-size: 1.12rem;
  line-height: 1.65;
}

.prose strong {
  color: var(--text);
  font-weight: 650;
}

.prose em {
  color: inherit;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.4rem;
}

.prose li + li {
  margin-top: 0.35em;
}

.prose li > ul,
.prose li > ol {
  margin: 0.35em 0 0;
}

.prose li > p {
  margin-bottom: 0.5em;
}

.prose ul > li::marker {
  color: var(--muted);
}

.prose ol > li::marker {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.prose dt {
  color: var(--text);
  font-weight: 650;
}

.prose dd {
  margin: 0.2rem 0 0.9rem 1.2rem;
}

.prose code {
  padding: 0.12em 0.36em;
  border: 1px solid var(--code-border);
  border-radius: 5px;
  background: var(--code-bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.86em;
  font-variant-ligatures: none;
  white-space: nowrap; /* never split `--json` at its hyphens */
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* In running text, inline code moves to the next line as a unit; only code
 * longer than a whole line (a long path) is allowed to break. */
.prose p code,
.prose li code,
.prose dd code {
  display: inline-block;
  max-width: 100%;
  white-space: normal;
  overflow-wrap: anywhere;
  line-height: 1.45;
  vertical-align: baseline;
}

.prose a code {
  color: inherit;
  border-color: var(--accent-line);
}

.prose h1 code,
.prose h2 code,
.prose h3 code,
.prose h4 code {
  padding: 0.04em 0.28em;
  font-size: 0.8em;
  font-weight: 600;
  white-space: normal;
}

/* Text blocks have no .code-lang span; label them from data-lang instead. */
.code-head:not(:has(.code-lang))::before {
  content: attr(data-lang);
  color: var(--code-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.prose hr + h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.15rem 0 0.15rem 1.15rem;
  border-left: 3px solid var(--border-strong);
  color: var(--text-soft);
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

/* Placeholder for an image the site must not publish (private or outside the
 * repository): the generator leaves a visible note instead of a broken icon. */
.missing-image {
  display: inline-block;
  padding: 0.1em 0.5em;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.prose small {
  color: var(--muted);
  font-size: 0.85em;
}

.prose sup,
.prose sub {
  line-height: 0;
}

.headerlink {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0 0.2rem;
  border-radius: 4px;
  color: var(--accent);
  font-weight: 500;
  font-size: 0.8em;
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.headerlink:hover {
  color: var(--accent-ink);
}

.prose h1:hover .headerlink,
.prose h2:hover .headerlink,
.prose h3:hover .headerlink,
.prose h4:hover .headerlink,
.prose h5:hover .headerlink,
.headerlink:focus-visible {
  opacity: 1;
}

@media (hover: none) {
  .headerlink {
    opacity: 0.45;
  }
}

/* ============================================================= 7. tables == */

/* site.js wraps every table in .table-wrap (its own scroll container). Without
 * JS the table itself scrolls; both look the same, so nothing shifts. */
.table-wrap,
html.no-js .prose table {
  margin: 1.6rem 0;
  max-width: 100%;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  overscroll-behavior-x: contain;
}

html.no-js .prose table {
  display: block;
}

.prose table {
  width: 100%;
  margin: 0;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
}

.prose th,
.prose td {
  min-width: 6.5rem;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.prose th + th,
.prose td + td {
  border-left: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
}

.prose thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--panel-soft);
  border-bottom-color: var(--border-strong);
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  vertical-align: bottom;
}

.prose tbody tr:nth-child(even) td {
  background: color-mix(in srgb, var(--panel-soft) 60%, var(--panel));
}

.prose tbody tr:hover td {
  background: var(--accent-soft);
}

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

.prose td {
  color: var(--text-soft);
}

.prose td code,
.prose th code {
  padding: 0.08em 0.32em;
  font-size: 0.84em;
  white-space: nowrap;
}

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

/* Tall tables get a capped height on wide screens, so the header stays put. */
@media (min-width: 901px) {
  .table-wrap.is-tall {
    max-height: min(72vh, 46rem);
  }
}

/* ============================================================== 8. code == */

.code-block {
  margin: 1.5rem 0;
  overflow: hidden;
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-text);
}

.code-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.4rem;
  padding: 0.3rem 0.4rem 0.3rem 0.95rem;
  border-bottom: 1px solid var(--code-border);
  background: var(--code-head-bg);
}

.code-lang {
  color: var(--code-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 30px;
  margin-left: auto;
  padding: 0 0.65rem;
  border: 1px solid var(--code-button-border);
  border-radius: var(--radius-xs);
  background: var(--code-button-bg);
  color: var(--code-text);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 550;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.copy-button:hover {
  border-color: var(--code-muted);
}

.copy-button svg {
  width: 15px;
  height: 15px;
  flex: none;
}

.copy-button.is-copied {
  border-color: var(--tk-inserted);
  color: var(--tk-inserted);
}

.copy-text {
  min-width: 3.4em;
  text-align: left;
}

.code-block pre {
  margin: 0;
  padding: 1rem 1.15rem 1.1rem;
  overflow-x: auto;
  color: var(--code-text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  tab-size: 4;
  scrollbar-width: thin;
  scrollbar-color: var(--code-button-border) transparent;
}

.code-block pre:focus-visible {
  outline-offset: -2px;
}

.code-block code,
.prose .code-block code {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}

/* A code block without a header (should one appear) still reads as a card. */
.prose > pre {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  background: var(--code-bg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
}

/* ==================================================== 9. syntax colours == */

.codehilite .c,
.codehilite .c1,
.codehilite .cm,
.codehilite .cs {
  color: var(--tk-comment);
  font-style: italic;
}

.codehilite .k,
.codehilite .kc,
.codehilite .kd,
.codehilite .kn,
.codehilite .kp,
.codehilite .kr,
.codehilite .kt,
.codehilite .ow {
  color: var(--tk-keyword);
  font-weight: 600;
}

.codehilite .s,
.codehilite .s1,
.codehilite .s2,
.codehilite .sb,
.codehilite .sc,
.codehilite .sd,
.codehilite .se,
.codehilite .sh,
.codehilite .sx {
  color: var(--tk-string);
}

.codehilite .se {
  font-weight: 600;
}

.codehilite .m,
.codehilite .mi,
.codehilite .mf,
.codehilite .mh,
.codehilite .mo,
.codehilite .il {
  color: var(--tk-number);
}

.codehilite .nf,
.codehilite .fm {
  color: var(--tk-function);
}

.codehilite .nb,
.codehilite .bp {
  color: var(--tk-builtin);
}

.codehilite .nv,
.codehilite .vc,
.codehilite .vg,
.codehilite .vi {
  color: var(--tk-builtin);
}

.codehilite .nt {
  color: var(--tk-tag);
}

.codehilite .na,
.codehilite .nd,
.codehilite .no,
.codehilite .ni {
  color: var(--tk-attr);
}

.codehilite .n,
.codehilite .w {
  color: inherit;
}

.codehilite .o,
.codehilite .p {
  color: var(--tk-operator);
}

.codehilite .gd {
  color: var(--tk-deleted);
}

.codehilite .gi {
  color: var(--tk-inserted);
}

.codehilite .err {
  color: var(--tk-deleted);
  text-decoration: underline wavy color-mix(in srgb, var(--tk-deleted) 60%, transparent);
  text-underline-offset: 3px;
}

/* =========================================================== 10. page toc == */

.page-toc {
  font-size: 0.84rem;
  line-height: 1.45;
}

.page-toc .toc-title {
  margin: 0 0 0.75rem;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-toc ul {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--border);
  list-style: none;
}

.page-toc a {
  display: block;
  margin-left: -1px;
  padding: 0.3rem 0.5rem 0.3rem 0.85rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.page-toc a:hover {
  color: var(--text);
  border-left-color: var(--border-strong);
}

.page-toc a.is-active {
  border-left-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}

.prose .page-toc li {
  margin: 0;
}

.toc-level-3 a {
  padding-left: 1.6rem;
  font-size: 0.8rem;
}

.page-toc--mobile {
  display: none;
  margin: 0 0 1.75rem;
  padding: 1rem 1.15rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.page-toc--mobile ul {
  max-height: 15rem;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.page-toc--mobile .toc-level-3 {
  display: none;
}

.page-toc--mobile.is-collapsible {
  padding: 0;
}

.page-toc--mobile.is-collapsible .toc-title {
  margin: 0;
}

.toc-toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  min-height: var(--tap);
  padding: 0.55rem 1.15rem;
  border: 0;
  border-radius: inherit;
  background: none;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-align: left;
  text-transform: inherit;
  cursor: pointer;
}

.toc-toggle .toc-count {
  margin-left: auto;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
}

.toc-toggle::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: translateY(-2px) rotate(45deg);
  transition: transform 0.15s var(--ease);
}

.toc-toggle[aria-expanded="true"]::after {
  transform: translateY(2px) rotate(-135deg);
}

.toc-toggle:hover {
  color: var(--accent-ink);
}

.page-toc--mobile.is-collapsible ul {
  max-height: min(22rem, 55vh);
  margin: 0 1.15rem 0.85rem;
}

.is-home .page-toc--mobile {
  display: none !important;
}

/* =========================================================== 11. callouts == */

/* Each type sets --callout; the pill label comes from .admonition-title::before
 * so meaning is carried by text, not by colour alone. */
.admonition,
.prose details {
  --callout: var(--note);
  --callout-label: "Note";
  position: relative;
  margin: 1.75rem 0;
  padding: 1rem 1.25rem 0.2rem 1.4rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--callout) 24%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--callout) 5%, var(--panel));
}

.admonition::before,
.prose details::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: var(--callout);
}

.admonition-title,
.prose details > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.65rem;
  margin: 0 0 0.6rem;
  color: var(--text);
  font-weight: 650;
  line-height: 1.45;
}

.admonition-title::before,
.prose details > summary::before {
  content: var(--callout-label);
  display: inline-flex;
  align-items: center;
  flex: none;
  padding: 0.18rem 0.55rem;
  border: 1px solid color-mix(in srgb, var(--callout) 35%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--callout) 13%, var(--panel));
  color: color-mix(in srgb, var(--callout) 82%, var(--text));
  font-size: 0.66rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  line-height: 1.3;
  text-transform: uppercase;
}

.admonition > p,
.prose details > p {
  max-width: var(--measure);
}

.admonition > :last-child,
.prose details > :last-child {
  margin-bottom: 0.85rem;
}

.admonition .code-block,
.prose details .code-block,
.admonition .table-wrap {
  background-clip: padding-box;
}

.admonition.info,
.admonition.todo {
  --callout-label: "Info";
}

.admonition.abstract,
.admonition.summary,
.admonition.tldr {
  --callout: var(--neutral);
  --callout-label: "Summary";
}

.admonition.tip,
.admonition.hint,
.admonition.important {
  --callout: var(--ok);
  --callout-label: "Tip";
}

.admonition.success,
.admonition.check,
.admonition.done {
  --callout: var(--ok);
  --callout-label: "Success";
}

.admonition.question,
.admonition.help,
.admonition.faq {
  --callout: var(--note);
  --callout-label: "Question";
}

.admonition.example {
  --callout: var(--neutral);
  --callout-label: "Example";
}

.admonition.quote,
.admonition.cite {
  --callout: var(--neutral);
  --callout-label: "Quote";
}

.admonition.warning,
.admonition.caution,
.admonition.attention {
  --callout: var(--warn);
  --callout-label: "Warning";
}

.admonition.danger,
.admonition.error,
.admonition.failure,
.admonition.fail,
.admonition.missing,
.admonition.bug {
  --callout: var(--danger);
  --callout-label: "Danger";
}

.admonition.error {
  --callout-label: "Error";
}

.admonition.bug {
  --callout-label: "Bug";
}

/* Collapsible callouts (<details class="admonition …">). */
.prose details > summary {
  min-height: var(--tap);
  margin: -0.65rem -0.5rem 0.3rem -0.4rem;
  padding: 0.4rem 2.25rem 0.4rem 0.4rem;
  position: relative;
  border-radius: var(--radius-sm);
  cursor: pointer;
  list-style: none;
}

.prose details > summary::-webkit-details-marker {
  display: none;
}

.prose details > summary::after {
  content: "";
  position: absolute;
  right: 0.85rem;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -6px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.18s var(--ease);
}

.prose details[open] > summary::after {
  margin-top: -2px;
  transform: rotate(-135deg);
}

.prose details > summary:hover {
  background: color-mix(in srgb, var(--callout) 8%, transparent);
}

.prose details:not([open]) {
  padding-bottom: 0.65rem;
}

.prose details:not([open]) > summary {
  margin-bottom: -0.35rem;
}

/* ============================================== 12. hero, buttons, cards == */

.site-icon {
  display: inline-flex;
  vertical-align: -0.15em;
  color: var(--accent);
}

.site-icon svg {
  width: 1.05em;
  height: 1.05em;
}

.site-icon.lg svg {
  width: 1.5em;
  height: 1.5em;
}

.site-icon.middle {
  vertical-align: middle;
}

/* --- hero ----------------------------------------------------------------- */

.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  margin: 0 0 3.5rem;
  padding: clamp(1.75rem, 1rem + 3vw, 3.25rem) clamp(1.25rem, 0.5rem + 3vw, 3rem)
    clamp(1.5rem, 1rem + 2vw, 2.5rem);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius-lg) + 4px);
  background: var(--panel);
  box-shadow: var(--shadow);
}

/* Faint dot grid fading out from the top-right, plus one soft accent glow. */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--text) 13%, transparent) 1px,
      transparent 0) 0 0 / 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse 75% 85% at 100% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 75% 85% at 100% 0%, #000 0%, transparent 70%);
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: -40%;
  right: -15%;
  width: 70%;
  height: 90%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 16%, transparent),
    transparent);
  pointer-events: none;
}

.prose .hero > h1 {
  order: 1;
  margin: 0 0 1.1rem;
  font-size: clamp(2.4rem, 1.6rem + 3.2vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

/* Small eyebrow above the title; decorative, so it is hidden from AT. */
.prose .hero > h1::before {
  content: "OBD-II · UDS · ISO 14229";
  content: "OBD-II · UDS · ISO 14229" / "";
  display: table;
  margin-bottom: 1.1rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.3;
}

.hero > h1 .headerlink {
  display: none;
}

.hero > p {
  order: 2;
  max-width: 62ch;
  margin-bottom: 1rem;
}

.prose .hero > h1 + p {
  color: var(--text-soft);
  font-size: clamp(1.08rem, 1rem + 0.35vw, 1.22rem);
  line-height: 1.6;
}

.hero > p:has(.md-button) {
  order: 3;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0.6rem 0 0.9rem;
}

.hero > p:has(> small) {
  order: 4;
  margin: 0;
}

.hero > p > small {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.01em;
}

.hero > .code-block {
  order: 5;
  margin: 2rem 0 0;
}

/* The hero snippet is a terminal card: dark in both themes. */
.hero .code-block {
  --code-bg: #0c1118;
  --code-head-bg: #121925;
  --code-border: #263041;
  --code-text: #e4e9f0;
  --code-muted: #8f9cb0;
  --code-button-bg: #1a2230;
  --code-button-border: #334055;
  --tk-comment: #8f9cb0;
  --tk-keyword: #c4a7ff;
  --tk-string: #86dba8;
  --tk-number: #f7b37a;
  --tk-function: #8db5ff;
  --tk-builtin: #6fd6e8;
  --tk-tag: #8db5ff;
  --tk-attr: #f0c674;
  --tk-operator: #aeb8c6;
  --tk-deleted: #ff9a9a;
  --tk-inserted: #86dba8;
  --accent: #86a8ff;
  border-radius: var(--radius);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, var(--shadow-lg);
}

.hero .code-head::before {
  content: "";
  flex: none;
  width: 44px;
  height: 10px;
  background:
    radial-gradient(circle, #ff6159 4.5px, transparent 5px) 0 0 / 10px 10px no-repeat,
    radial-gradient(circle, #ffbd2e 4.5px, transparent 5px) 17px 0 / 10px 10px no-repeat,
    radial-gradient(circle, #28c941 4.5px, transparent 5px) 34px 0 / 10px 10px no-repeat;
  opacity: 0.85;
}

.hero .code-block pre {
  padding: 1.15rem 1.3rem 1.25rem;
  font-size: 0.88rem;
}

/* --- buttons -------------------------------------------------------------- */

.md-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: var(--tap);
  padding: 0 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 0.15s var(--ease), box-shadow 0.15s ease, border-color 0.15s ease,
    background-color 0.15s ease, color 0.15s ease;
}

.md-button:hover {
  border-color: var(--text-soft);
  color: var(--text);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.md-button:active {
  transform: none;
}

.md-button::after {
  content: "→";
  transition: transform 0.15s var(--ease);
}

.md-button:hover::after {
  transform: translateX(2px);
}

.md-button--primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 1px 2px color-mix(in srgb, var(--accent) 30%, transparent),
    0 6px 18px -6px color-mix(in srgb, var(--accent) 60%, transparent);
}

.md-button--primary:hover {
  border-color: var(--accent-ink);
  background: var(--accent-ink);
  color: var(--on-accent);
}

/* --- feature cards ---------------------------------------------------------- */

.grid.cards > ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15.5rem), 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
  padding: 0;
  list-style: none;
}

.grid.cards > ul > li {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 1.3rem 1.3rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s var(--ease), box-shadow 0.18s ease, border-color 0.18s ease;
}

.grid.cards > ul > li:hover {
  border-color: var(--accent-line);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.grid.cards > ul > li > p {
  max-width: none;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Title row: optional icon tile stacked above a bold title. */
.grid.cards > ul > li > p:first-child {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.35;
}

.grid.cards > ul > li > p:first-child strong {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.grid.cards .site-icon.lg {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.grid.cards .site-icon.lg svg {
  width: 1.35rem;
  height: 1.35rem;
}

.grid.cards > ul > li > hr {
  width: 100%;
  height: 0;
  margin: 0.9rem 0 0.8rem;
  border: 0;
  border-top: 1px solid var(--border);
}

.grid.cards > ul > li > p + p {
  margin-top: 0.6rem;
}

.grid.cards > ul > li > :last-child {
  margin-bottom: 0;
}

/* A card whose title is a link becomes clickable as a whole. */
.grid.cards > ul > li > p:first-child a {
  color: var(--text);
  text-decoration: none;
}

.grid.cards > ul > li > p:first-child a::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
}

.grid.cards > ul > li > p:first-child a:focus-visible {
  outline: none;
}

.grid.cards > ul > li:has(> p:first-child a:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.grid.cards > ul > li > p:first-child strong:has(> a)::after {
  content: " →";
  color: var(--accent);
  display: inline-block;
  transition: transform 0.18s var(--ease);
}

.grid.cards > ul > li:hover > p:first-child strong:has(> a)::after {
  transform: translateX(3px);
}

.grid.cards > ul > li:hover > p:first-child a {
  color: var(--accent-ink);
}

.grid.cards > ul > li > p:not(:first-child) a {
  position: relative;
  z-index: 2;
}

/* --- keys ----------------------------------------------------------------- */

.keys {
  white-space: nowrap;
}

.prose .keys kbd {
  font-size: 0.8em;
}

.keys-sep {
  margin: 0 0.15em;
  color: var(--muted);
}

/* ======================================== 13. lists, footers, pager, misc == */

.page-list,
.prose .page-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
  gap: 0.85rem;
  margin: 1.25rem 0 2rem;
  padding: 0;
  list-style: none;
}

.prose .page-list > li {
  position: relative;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 1rem 1.15rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.prose .page-list > li:hover {
  border-color: var(--accent-line);
  box-shadow: var(--shadow);
}

/* The generated "All pages" index: group headings read as section labels. */
.is-index .prose h2 {
  margin: 2.5rem 0 0.25rem;
  padding-top: 0;
  border-top: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.page-list a {
  order: 1;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 650;
  text-decoration: none;
}

.page-list a::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.page-list a:focus-visible {
  outline: none;
}

.page-list li:has(a:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-list li:hover a {
  color: var(--accent-ink);
}

.page-list-path {
  order: 0;
  display: block;
  margin-bottom: 0.2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.prose .page-list-desc {
  order: 2;
  margin: 0.35rem 0 0;
  color: var(--text-soft);
  font-size: 0.86rem;
  line-height: 1.55;
}

.page-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin: 4rem 0 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.edit-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 36px;
  color: var(--text-soft);
  font-weight: 600;
  text-decoration: none;
}

.edit-link:hover {
  color: var(--accent-ink);
}

.edit-link svg {
  width: 16px;
  height: 16px;
}

.page-source {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.95rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  text-decoration: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.pager-link:hover {
  border-color: var(--accent-line);
  box-shadow: var(--shadow);
}

.pager-prev {
  grid-column: 1;
}

.pager-next {
  grid-column: 2;
  align-items: flex-end;
  text-align: right;
}

.pager-label {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pager-prev .pager-label::before {
  content: "← ";
}

.pager-next .pager-label::after {
  content: " →";
}

.pager-title {
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 650;
  line-height: 1.35;
}

.pager-link:hover .pager-title {
  color: var(--accent-ink);
}

.site-footer {
  flex: none;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}

.site-footer-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer-brand {
  margin: 0;
}

.site-footer-brand strong {
  color: var(--text);
}

.site-footer-brand span {
  margin-left: 0.25rem;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

.site-footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--muted);
  text-decoration: none;
}

.site-footer-links a:hover {
  color: var(--accent-ink);
  text-decoration: underline;
}

.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 35;
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  border: 1px solid var(--border);
  border-radius: 50%;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
  color: var(--text);
  font: inherit;
  font-size: 1.05rem;
  cursor: pointer;
  animation: fade-in 0.2s ease;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.to-top:hover {
  border-color: var(--accent-line);
  color: var(--accent-ink);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 80;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: var(--text);
  box-shadow: var(--shadow-lg);
  color: var(--bg);
  font-size: 0.85rem;
  font-weight: 550;
  transform: translateX(-50%);
  animation: toast-in 0.2s var(--ease);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translate(-50%, 6px);
  }
}

/* ========================================================= 14. responsive == */

/* No right-hand TOC column: the TOC moves above the article. */
@media (max-width: 1240px) {
  .shell {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  }

  .toc-column {
    display: none;
  }

  .page-toc--mobile {
    display: block;
  }

  .content {
    padding: 2rem 2.25rem 3rem;
  }
}

/* Drawer navigation. */
@media (max-width: 900px) {
  :root {
    --topbar-height: 56px;
  }

  .shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .topbar-inner {
    gap: 0.25rem;
    padding: 0 0.5rem;
  }

  .icon-button {
    min-width: var(--tap);
    height: var(--tap);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .brand {
    gap: 0.55rem;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .brand-tagline,
  .github-label,
  .search-toggle-label,
  .search-toggle-kbd {
    display: none;
  }

  .github-link {
    padding: 0;
  }

  .search {
    flex: none;
  }

  .search-toggle {
    width: var(--tap);
    padding: 0;
    justify-content: center;
    border-color: transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-soft);
  }

  .search-toggle svg {
    width: 20px;
    height: 20px;
  }

  /* Full-screen search. */
  .search.is-open::before {
    background: var(--bg);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    animation: none;
  }

  .search.is-open .search-panel {
    inset: 0;
    top: 0;
    left: 0;
    width: auto;
    max-height: none;
    transform: none;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    background: var(--bg);
    animation: none;
  }

  .search-field {
    padding: 0 0.25rem 0 1rem;
    min-height: 60px;
  }

  .search-field input {
    font-size: 1.05rem; /* ≥16px stops iOS zooming into the field */
  }

  .search-result a {
    padding: 0.8rem 0.85rem;
  }

  .search-hint kbd {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 60;
    width: min(86vw, 320px);
    height: 100%;
    border-right: 1px solid var(--border);
    background: var(--panel);
    box-shadow: var(--shadow-lg);
    transform: translateX(-104%);
    visibility: hidden;
    transition: transform 0.24s var(--ease), visibility 0s linear 0.24s;
  }

  .sidebar.is-open {
    transform: none;
    visibility: visible;
    transition: transform 0.24s var(--ease), visibility 0s;
  }

  .sidebar-inner {
    padding: 0.5rem 0.75rem calc(1rem + env(safe-area-inset-bottom));
  }

  .sidebar-top {
    position: sticky;
    top: -0.5rem;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: -0.5rem -0.75rem 0;
    padding: 0.4rem 0.5rem 0.4rem 1.2rem;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
  }

  .nav-link,
  .sidebar-link,
  .nav-group--more > summary {
    min-height: var(--tap);
  }

  .nav-link {
    font-size: 0.95rem;
  }

  .content {
    padding: 1.5rem 1.25rem 2.5rem;
  }

  .hero {
    margin-left: -0.25rem;
    margin-right: -0.25rem;
  }

  .page-toc--mobile a {
    padding-top: 0.55rem;
    padding-bottom: 0.55rem;
  }

  .copy-button {
    min-height: 36px;
  }
}

@media (max-width: 600px) {
  body {
    line-height: 1.65;
  }


  .prose h2 {
    margin-top: 2.6rem;
    padding-top: 1.3rem;
  }

  .grid.cards > ul {
    gap: 0.75rem;
  }

  .pager {
    grid-template-columns: minmax(0, 1fr);
  }

  .pager-next {
    grid-column: 1;
  }

  .hero > p:has(.md-button) .md-button {
    flex: 1 1 12rem;
    white-space: nowrap;
  }

  .prose table {
    font-size: 0.84rem;
  }

  .prose th,
  .prose td {
    min-width: 5.5rem;
    padding: 0.55rem 0.7rem;
  }

  .admonition,
  .prose details {
    padding-left: 1.15rem;
    padding-right: 1rem;
  }

  .site-footer-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem 1.25rem calc(1.5rem + env(safe-area-inset-bottom));
  }

  .to-top {
    right: 0.9rem;
    bottom: calc(0.9rem + env(safe-area-inset-bottom));
  }
}

@media (pointer: coarse) {
  .copy-button {
    min-height: var(--tap);
    min-width: var(--tap);
  }

  .headerlink {
    padding: 0.35rem;
  }
}

/* ============================================== 15. no-js, motion, print == */

html.no-js .search,
html.no-js .to-top,
html.no-js .copy-button,
html.no-js .nav-toggle,
html.no-js .sidebar-close {
  display: none;
}

html.no-js .site-nav .nav-group--more {
  display: block;
}

/* Without JS the drawer cannot open, so the nav simply sits above the page. */
@media (max-width: 900px) {
  html.no-js .sidebar {
    position: static;
    width: auto;
    height: auto;
    transform: none;
    visibility: visible;
    box-shadow: none;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  html.no-js .sidebar-top {
    position: static;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  .md-button:hover,
  .grid.cards > ul > li:hover {
    transform: none;
  }
}

@media (forced-colors: active) {
  .search-result[aria-selected="true"] a {
    outline: 2px solid Highlight;
    outline-offset: -2px;
  }

  .md-button,
  .toc-toggle {
    border: 1px solid ButtonText;
  }

  .nav-link.is-active,
  .page-toc a.is-active {
    border-left: 3px solid Highlight;
  }

  .admonition::before,
  .prose details::before {
    background: CanvasText;
  }
}

@media print {
  .topbar,
  .sidebar,
  .toc-column,
  .page-toc--mobile,
  .page-footer,
  .pager,
  .site-footer,
  .to-top,
  .toast,
  .search,
  .copy-button,
  .headerlink {
    display: none !important;
  }

  body {
    display: block;
    background: #fff;
    color: #000;
  }

  .shell {
    display: block;
  }

  .content {
    padding: 0;
  }

  .hero,
  .grid.cards > ul > li,
  .table-wrap,
  .code-block {
    box-shadow: none;
    break-inside: avoid;
  }

  .table-wrap {
    max-height: none !important;
    overflow: visible;
  }
}