/* Arc Forge Design System (Knot): one red accent, Geist, mono labels, hairline rules. */
:root {
  --bg: #f2f2f5;
  --surface: #ffffff;
  --surface-2: #eaeaef;
  --text: #3a3a42;
  --strong: #18181b;
  --dim: #68676f;
  --border: #e2e2e8;
  --brand: #c41e30;
  --brand-ink: #ffffff;
  --link: #981e2e;
  --code-bg: #eaeaef;
  --accent-subtle: rgba(196, 30, 48, 0.08);
  --radius: 10px;
  --radius-lg: 14px;
  --font: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --header: 64px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0d0f;
    --surface: #111113;
    --surface-2: #1a1a1e;
    --text: #c6c6cb;
    --strong: #f5f5f7;
    --dim: #8a8a94;
    --border: #202026;
    --brand: #e5243b;
    --brand-ink: #fafafa;
    --link: #ea5264;
    --code-bg: #141416;
    --accent-subtle: rgba(229, 36, 59, 0.12);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d0d0f;
  --surface: #111113;
  --surface-2: #1a1a1e;
  --text: #c6c6cb;
  --strong: #f5f5f7;
  --dim: #8a8a94;
  --border: #202026;
  --brand: #e5243b;
  --brand-ink: #fafafa;
  --link: #ea5264;
  --code-bg: #141416;
  --accent-subtle: rgba(229, 36, 59, 0.12);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--header) + 16px); }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--font); letter-spacing: -0.005em; -webkit-font-smoothing: antialiased; }
::selection { background: var(--accent-subtle); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }
a { color: var(--link); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.top { position: sticky; top: 0; z-index: 20; height: var(--header); display: flex; align-items: center; gap: 16px; padding: 0 16px; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: baseline; gap: 10px; font-weight: 650; letter-spacing: -0.02em; color: var(--strong); text-decoration: none; white-space: nowrap; }
.brand span { font: 500 12px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--brand); }
.products { display: flex; gap: 4px; }
.products a { padding: 6px 10px; border-radius: 999px; color: var(--dim); text-decoration: none; font: 500 13px var(--mono); }
.products a:hover { background: var(--surface-2); color: var(--text); }
.products a[aria-current] { color: var(--brand); }
.release-badge { font: 12px/1 var(--mono); padding: 5px 8px; border: 1px solid var(--border); border-radius: 999px; color: var(--dim); text-decoration: none; white-space: nowrap; }
.release-badge:hover { color: var(--text); border-color: var(--dim); }
.search-open { margin-left: auto; display: flex; align-items: center; gap: 24px; padding: 6px 8px 6px 12px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--dim); font: inherit; font-size: 14px; cursor: pointer; }
.search-open kbd { font: 12px var(--mono); padding: 1px 6px; border: 1px solid var(--border); border-radius: 4px; }
.theme, .menu { width: 34px; height: 34px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); cursor: pointer; display: grid; place-items: center; }
.theme::before { content: ""; width: 14px; height: 14px; border-radius: 50%; background: linear-gradient(90deg, var(--text) 50%, transparent 50%); border: 1.5px solid var(--text); }
.menu { display: none; }
.menu span, .menu span::before, .menu span::after { display: block; width: 14px; height: 1.5px; background: var(--text); position: relative; }
.menu span::before, .menu span::after { content: ""; position: absolute; }
.menu span::before { top: -5px; }
.menu span::after { top: 5px; }

.search-panel { position: fixed; inset: var(--header) 0 auto 0; z-index: 30; padding: 16px; background: var(--bg); border-bottom: 1px solid var(--border); box-shadow: 0 12px 32px rgb(0 0 0 / 0.12); max-height: calc(100vh - var(--header)); overflow: auto; }
.search-box { max-width: 760px; margin: 0 auto; --pagefind-ui-primary: var(--brand); --pagefind-ui-text: var(--text); --pagefind-ui-background: var(--surface); --pagefind-ui-border: var(--border); --pagefind-ui-tag: var(--surface-2); --pagefind-ui-font: var(--font); --pagefind-ui-border-radius: 8px; }

.frame { display: grid; grid-template-columns: 272px minmax(0, 1fr) 224px; gap: 40px; max-width: 1440px; margin: 0 auto; padding: 0 24px; }
.frame.no-sidebar { grid-template-columns: minmax(0, 1fr); max-width: 960px; }
.sidebar { position: sticky; top: var(--header); align-self: start; max-height: calc(100vh - var(--header)); overflow: auto; padding: 24px 8px 48px 0; font-size: 14px; }
.nav-tab > h2 { font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--brand); margin: 0 0 8px; }
.nav-tab + .nav-tab { margin-top: 24px; }
.nav-group h3 { font-size: 13px; font-weight: 650; color: var(--strong); margin: 16px 0 4px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar ul ul { padding-left: 12px; border-left: 1px solid var(--border); margin-left: 4px; }
.sidebar a { display: block; padding: 4px 8px; border-radius: 6px; color: var(--dim); text-decoration: none; }
.sidebar a:hover { color: var(--text); background: var(--surface-2); }
.sidebar a[aria-current] { color: var(--brand); background: var(--accent-subtle); font-weight: 600; }
.sidebar summary { padding: 4px 8px; cursor: pointer; color: var(--text); font-weight: 550; }

main { min-width: 0; padding: 32px 0 80px; }
.toc { position: sticky; top: var(--header); align-self: start; padding: 32px 0; font-size: 13px; }
.outline h2 { font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--dim); margin: 0 0 8px; }
.outline ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.outline li a { display: block; padding: 3px 12px; color: var(--dim); text-decoration: none; }
.outline li.l3 a { padding-left: 24px; }
.outline li a:hover, .outline li a.active { color: var(--strong); }
.outline li a.active { box-shadow: -1px 0 0 var(--brand); }

.crumbs { font: 500 12px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 10px; }
.crumbs a { color: var(--brand); text-decoration: none; }
article h1 { font-size: clamp(30px, 4vw, 40px); font-weight: 650; line-height: 1.06; letter-spacing: -0.035em; color: var(--strong); margin: 0 0 12px; text-wrap: balance; }
article .lede { color: var(--dim); font-size: 18px; margin: 0 0 24px; }
article h2 { font-size: 24px; font-weight: 650; letter-spacing: -0.03em; line-height: 1.15; color: var(--strong); margin: 44px 0 12px; padding-top: 20px; border-top: 1px solid var(--border); text-wrap: balance; }
article h3 { font-size: 18px; font-weight: 650; letter-spacing: -0.02em; color: var(--strong); margin: 28px 0 8px; }
article h4 { font-size: 16px; font-weight: 650; color: var(--strong); margin: 20px 0 6px; }
.heading-anchor { margin-left: 6px; color: var(--dim); text-decoration: none; opacity: 0; }
h2:hover .heading-anchor, h3:hover .heading-anchor, h4:hover .heading-anchor { opacity: 1; }
article p, article ul, article ol { margin: 0 0 14px; }
article li + li { margin-top: 4px; }
article img { max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: var(--radius); }
article blockquote { margin: 0 0 16px; padding: 8px 16px; border-left: 3px solid var(--brand); background: var(--surface-2); border-radius: 0 var(--radius) var(--radius) 0; }
article hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
code { font: 0.88em var(--mono); background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre.code { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; overflow: auto; font-size: 14px; line-height: 1.55; }
pre.code code { background: none; padding: 0; font-size: inherit; }
pre.mermaid { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; overflow: auto; text-align: center; }
.table-wrap { overflow-x: auto; margin: 0 0 16px; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font-weight: 600; color: var(--strong); }
tr:last-child td { border-bottom: 0; }
details.release-source-toggle { margin: 0 0 16px; }

.page-foot { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 13px; color: var(--dim); }
.page-foot a { color: var(--dim); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 32px; }
.pager a { display: block; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: var(--text); background: var(--surface); }
.pager a:hover { border-color: var(--dim); }
.pager small { display: block; color: var(--dim); font-size: 12px; }
.pager .next { text-align: right; grid-column: 2; }

.hero { padding: 48px 0 24px; }
.hero h1 { font-size: clamp(36px, 6vw, 56px); font-weight: 650; letter-spacing: -0.04em; line-height: 1.04; color: var(--strong); margin: 0 0 14px; }
.hero p { color: var(--dim); font-size: 18px; max-width: 620px; margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin: 24px 0; }
.card { display: block; padding: 28px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); color: var(--text); text-decoration: none; }
.card:hover { border-color: var(--brand); }
.card h2 { margin: 0 0 6px; font-size: 22px; font-weight: 650; letter-spacing: -0.03em; color: var(--strong); border: 0; padding: 0; }
.card p { margin: 0 0 12px; color: var(--dim); font-size: 15px; }
.card .meta { font: 500 12px var(--mono); color: var(--brand); }

.foot { display: flex; gap: 16px; justify-content: center; padding: 24px 16px; border-top: 1px solid var(--border); color: var(--dim); font-size: 13px; }
.foot a { color: var(--dim); }

@media (max-width: 1180px) {
  .frame { grid-template-columns: 248px minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .top { gap: 10px; }
  .products, .release-badge { display: none; }
  .search-open { gap: 8px; }
  .search-open kbd { display: none; }
  .menu { display: grid; }
  .frame, .frame.no-sidebar { grid-template-columns: minmax(0, 1fr); padding: 0 16px; gap: 0; }
  .sidebar { display: none; position: fixed; inset: var(--header) 0 0 0; z-index: 25; max-height: none; background: var(--bg); padding: 16px; }
  .sidebar.open { display: block; }
  .sidebar .mobile-products { display: flex; }
  article h1, .hero h1 { font-size: 28px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}
.mobile-products { display: none; gap: 8px; margin-bottom: 16px; }
.mobile-products a { padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px; text-decoration: none; color: var(--text); font-size: 14px; }