html {
  scroll-padding-top: 6rem;
}

.guide-page {
  background: var(--paper);
}

.guide-site-header {
  position: sticky;
  top: 0;
  z-index: 30;
}

.guide-site-header nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.35em;
}

.guide-mast {
  background: var(--violet);
  color: var(--hero-ink);
  padding: clamp(4.5rem, 9vw, 8.5rem) clamp(1.25rem, 4vw, 4rem) clamp(2rem, 4vw, 3.5rem);
}

.guide-mast-inner {
  align-items: end;
  display: grid;
  gap: clamp(3rem, 8vw, 9rem);
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
  margin: 0 auto;
  max-width: 92rem;
}

.guide-kicker,
.guide-toc > p {
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.guide-kicker {
  color: var(--signal);
  margin: 0 0 1rem;
}

.guide-mast h1 {
  font-size: clamp(3.4rem, 7.2vw, 7.8rem);
  font-weight: 760;
  letter-spacing: -0.045em;
  line-height: 0.92;
  margin: 0;
  max-width: 10ch;
  text-wrap: balance;
}

.guide-lede {
  font-size: clamp(1.08rem, 1.7vw, 1.4rem);
  line-height: 1.6;
  margin: clamp(2rem, 4vw, 3.5rem) 0 0;
  max-width: 62ch;
}

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

.guide-promises li {
  align-items: baseline;
  border-top: 1px solid oklch(90% 0.04 294 / 38%);
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(8rem, auto) minmax(0, 1fr);
  line-height: 1.45;
  padding: 1rem 0 1.1rem;
}

.guide-promises li:last-child {
  border-bottom: 1px solid oklch(90% 0.04 294 / 38%);
}

.guide-promises strong {
  white-space: nowrap;
}

.guide-contract {
  background: var(--violet-dark);
  border: 1px solid oklch(75% 0.08 294 / 35%);
  margin: clamp(3rem, 7vw, 6rem) auto 0;
  max-width: 92rem;
  padding: 1rem 1.15rem;
}

.guide-contract p {
  line-height: 1.55;
  margin: 0;
  max-width: 76ch;
}

.guide-contract a {
  color: var(--signal);
}

.guide-shell {
  display: grid;
  gap: clamp(2rem, 5vw, 5rem);
  grid-template-columns: minmax(12rem, 0.3fr) minmax(0, 1fr);
  margin: 0 auto;
  max-width: 82rem;
  padding: 0 clamp(1.25rem, 4vw, 4rem) clamp(7rem, 12vw, 12rem);
}

.guide-toc {
  align-self: start;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
  padding: 4.5rem 0 2rem;
  position: sticky;
  top: 4rem;
}

.guide-toc > p {
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.guide-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.guide-toc li {
  border-top: 1px solid var(--line);
}

.guide-toc li:last-child {
  border-bottom: 1px solid var(--line);
}

.guide-toc a {
  color: var(--muted);
  display: block;
  font-size: 0.86rem;
  padding: 0.62rem 0.7rem;
  text-decoration: none;
  transition: background-color 160ms cubic-bezier(0.22, 1, 0.36, 1), color 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

.guide-toc a:hover,
.guide-toc a.is-active {
  background: var(--violet-soft);
  color: var(--violet-ink);
}

.guide-toc a.is-active {
  font-weight: 750;
}

.guide-content {
  min-width: 0;
}

.guide-section {
  border-top: 1px solid var(--line);
  padding: clamp(4.5rem, 8vw, 7rem) 0;
  scroll-margin-top: 5rem;
}

.guide-section:first-child {
  border-top: 0;
}

.guide-section h2 {
  font-size: clamp(2.5rem, 5.2vw, 5.6rem);
  letter-spacing: -0.05em;
  line-height: 0.96;
  margin: 0;
  max-width: 14ch;
  text-wrap: balance;
}

.guide-section h3 {
  font-size: clamp(1.3rem, 2.3vw, 1.75rem);
  letter-spacing: -0.025em;
  margin: 3rem 0 0.6rem;
}

.guide-section p,
.guide-section li,
.guide-section dd {
  line-height: 1.7;
}

.guide-section p {
  max-width: 72ch;
}

.section-lede {
  color: var(--muted);
  font-size: clamp(1.06rem, 1.5vw, 1.25rem);
  margin: 1.5rem 0 2.5rem;
}

.guide-section :not(pre) > code,
.guide-contract code {
  background: var(--page-layer, var(--paper-deep));
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--violet-ink);
  font: 0.88em/1.4 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  padding: 0.08em 0.32em;
}

.definition-rows {
  margin: 2.5rem 0;
}

.definition-rows > div {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1.2rem;
  grid-template-columns: minmax(7rem, 0.28fr) minmax(0, 1fr);
  padding: 1.1rem 0 1.25rem;
}

.definition-rows > div:last-child {
  border-bottom: 1px solid var(--line);
}

.definition-rows dt {
  color: var(--violet);
  font-weight: 800;
}

.definition-rows dd {
  margin: 0;
}

.guide-note {
  background: var(--paper-deep);
  border: 1px solid var(--line);
  margin: 2rem 0;
  padding: 1rem 1.15rem;
}

.guide-note p {
  margin: 0;
}

.code-sample {
  background: var(--violet-dark);
  border: 1px solid color-mix(in oklch, var(--violet-dark), var(--paper) 18%);
  color: var(--hero-ink);
  margin: 2rem 0;
  min-width: 0;
}

.code-sample figcaption {
  align-items: center;
  border-bottom: 1px solid oklch(75% 0.08 294 / 35%);
  display: flex;
  justify-content: space-between;
  min-height: 2.75rem;
  padding: 0.45rem 0.65rem 0.45rem 1rem;
}

.code-sample figcaption > span {
  color: var(--signal);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-sample figcaption button {
  background: transparent;
  border: 1px solid oklch(75% 0.08 294 / 35%);
  border-radius: 5px;
  color: var(--hero-ink);
  cursor: pointer;
  font: 700 0.72rem/1 "Avenir Next", Avenir, sans-serif;
  min-height: 2rem;
  padding: 0 0.7rem;
}

.code-sample figcaption button:hover,
.code-sample figcaption button[data-copied="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--semantic-ink, var(--violet-ink));
}

.code-sample figcaption button:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 2px;
}

.code-sample pre {
  margin: 0;
  overflow: auto;
  padding: clamp(1.15rem, 3vw, 1.8rem);
}

.code-sample pre code,
.rdf-result code {
  font: 0.82rem/1.75 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

.code-sample pre code {
  color: var(--hero-ink);
  white-space: pre;
}

.code-sample.compact pre code {
  white-space: pre-wrap;
}

.rdf-result {
  background: var(--hero-ink);
  color: var(--violet-ink);
  display: grid;
  gap: 0.65rem;
  padding: 1rem 1.2rem 1.25rem;
}

.rdf-result > span {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rdf-result code {
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

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

.example-pair .code-sample {
  margin: 0;
}

.guide-table-wrap {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
  overflow-x: auto;
}

.guide-table-wrap table {
  border-collapse: collapse;
  min-width: 700px;
  width: 100%;
}

.guide-table-wrap th,
.guide-table-wrap td {
  border-bottom: 1px solid var(--line);
  line-height: 1.5;
  padding: 0.85rem 1rem;
  text-align: left;
  vertical-align: top;
}

.guide-table-wrap tr:last-child td {
  border-bottom: 0;
}

.guide-table-wrap th {
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.guide-table-wrap td:first-child {
  color: var(--violet-ink);
  font-weight: 750;
}

.guide-fine-print {
  color: var(--muted);
  font-size: 0.84rem;
}

.behavior-list,
.authoring-checklist,
.guide-next-list {
  list-style: none;
  margin: 2rem 0;
  padding: 0;
}

.behavior-list li,
.authoring-checklist li {
  border-top: 1px solid var(--line);
  padding: 0.9rem 0 1rem;
}

.behavior-list li:last-child,
.authoring-checklist li:last-child {
  border-bottom: 1px solid var(--line);
}

.authoring-checklist li {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1.6rem minmax(0, 1fr);
}

.authoring-checklist li::before {
  color: var(--violet);
  content: "✓";
  font-weight: 900;
}

.mistakes {
  background: var(--paper-deep);
  border: 1px solid var(--line);
  margin: 2.5rem 0;
}

.mistakes summary {
  cursor: pointer;
  font-weight: 800;
  padding: 1rem 1.15rem;
}

.mistakes[open] summary {
  border-bottom: 1px solid var(--line);
}

.mistakes > div {
  padding: 0.25rem 1.15rem 0.75rem;
}

.mistakes p {
  margin: 0.85rem 0;
}

.guide-next-list li {
  border-top: 1px solid var(--line);
}

.guide-next-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.guide-next-list a {
  align-items: center;
  display: grid;
  gap: 1.2rem;
  grid-template-columns: minmax(0, 1fr) 2rem;
  padding: 1.25rem 0 1.4rem;
  text-decoration: none;
}

.guide-next-list a > span:first-child {
  display: grid;
  gap: 0.25rem;
}

.guide-next-list strong {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  letter-spacing: -0.025em;
  transition: color 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

.guide-next-list small {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.guide-next-list a > span:last-child {
  color: var(--violet);
  font-size: 1.35rem;
  justify-self: end;
}

.guide-next-list a:hover strong {
  color: var(--violet);
}

.sr-only {
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

@media (max-width: 920px) {
  html {
    scroll-padding-top: 8.5rem;
  }

  .guide-mast-inner,
  .guide-shell {
    grid-template-columns: 1fr;
  }

  .guide-promises {
    max-width: 44rem;
  }

  .guide-shell {
    gap: 0;
    max-width: none;
    padding-inline: 0;
  }

  .guide-toc {
    align-items: center;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    display: flex;
    gap: 0.75rem;
    max-height: none;
    overflow: hidden;
    padding: 0.45rem clamp(1.25rem, 4vw, 4rem);
    top: 4rem;
    z-index: 20;
  }

  .guide-toc > p {
    flex: 0 0 auto;
    margin: 0;
  }

  .guide-toc ol {
    display: flex;
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .guide-toc ol::-webkit-scrollbar {
    display: none;
  }

  .guide-toc li {
    border: 0;
    flex: 0 0 auto;
  }

  .guide-toc li:last-child {
    border: 0;
  }

  .guide-toc a {
    border-radius: 5px;
    white-space: nowrap;
  }

  .guide-content {
    padding: 0 clamp(1.25rem, 4vw, 4rem);
  }
}

@media (max-width: 700px) {
  .guide-mast h1 {
    font-size: clamp(3.2rem, 15vw, 5rem);
  }

  .guide-promises li {
    grid-template-columns: 1fr;
  }

  .guide-promises li strong {
    white-space: normal;
  }

  .guide-promises li {
    align-items: start;
    gap: 0.25rem;
  }

  .definition-rows > div,
  .example-pair {
    grid-template-columns: 1fr;
  }

  .definition-rows {
    margin-top: 2rem;
  }

  .definition-rows dt {
    margin-bottom: -0.8rem;
  }

  .code-sample pre code,
  .rdf-result code {
    font-size: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .guide-toc a,
  .guide-next-list strong {
    transition: none;
  }
}