/* =============================================================================
 * Ferroma documentation site
 *
 * Visual language: Beautiful UI (https://www.beautifului.dev) — the same oklch
 * token set, the same hairline/1px-ring elevation model, the same dashed
 * section rules, the same Inter + JetBrains Mono pairing and the same radius
 * scale (chip 6 / control 8 / card 10 / window 14).
 *
 * Two deliberate departures, both noted at the point of use:
 *   --brand   keeps Ferroma's own envelope orange for identity marks (logo,
 *             favicon, home accents). Everything interactive uses --accent.
 *   fonts     are a system stack with Inter / JetBrains Mono first, so the site
 *             stays a zero-dependency artefact with no external font request.
 * ========================================================================== */

/* ------------------------------------------------------------------ tokens */
:root {
  /* surfaces */
  --page:        oklch(98.5% .001 286.376);
  --canvas:      oklch(96.1% .002 247.84);
  --surface:     oklch(100% 0 0);
  --inset:       oklch(97.9% .002 247.839);
  --field:       oklch(96.1% .001 286.375);
  --hover:       oklch(97% .002 247.839);
  --hover-2:     oklch(93.3% .003 247.86);
  --stripe:      oklch(0% 0 0/.022);
  --stripe-bg:   oklch(98.9% .001 286.376);

  /* text */
  --ink:         oklch(24.7% .006 258.361);
  --ink-2:       oklch(50.6% .01 264.477);
  --ink-3:       oklch(69.5% .009 264.505);

  /* lines */
  --line:        oklch(94.6% .003 264.542);
  --line-strong: oklch(91.2% .005 258.326);
  --line-soft:   oklch(96.6% .002 264.542);

  /* accent + status */
  --accent:      oklch(62.6% .205 254.947);
  --accent-ink:  oklch(55.6% .187 255.617);
  --accent-tint: oklch(96% .019 252.878);
  --brand:       oklch(68.2% .18 37.9);
  --brand-tint:  oklch(68.2% .18 37.9/.12);
  --green:       oklch(62.7% .17 149.2);
  --green-tint:  oklch(62.7% .17 149.2/.12);
  --orange:      oklch(64.6% .194 41.1);
  --orange-tint: oklch(64.6% .194 41.1/.12);
  --red:         oklch(57.7% .215 27.3);
  --red-tint:    oklch(57.7% .215 27.3/.1);
  --mark:        oklch(62.6% .205 254.947/.22);

  /* elevation — a ring first, a shadow second */
  --shadow-xs:         0 0 4px 0 oklch(0% 0 0/.04);
  --shadow-sm:         0 18px 47px 0 oklch(0% 0 0/.03), 0 4px 10.5px 0 oklch(0% 0 0/.02), 0 .5px 1.3px 0 oklch(0% 0 0/.012);
  --shadow-md:         0 17.54px 23.39px 0 oklch(0% 0 0/.04), 0 5.25px 7px 0 oklch(0% 0 0/.02), 0 1.16px 1.5px 0 oklch(0% 0 0/.012);
  --shadow-lg:         0 25px 50px 0 oklch(0% 0 0/.05), 0 6px 12px 0 oklch(0% 0 0/.03), 0 1.5px 3px 0 oklch(0% 0 0/.02);
  --shadow-hairline:   0 0 0 1px var(--line);
  --shadow-btn:        0 0 0 1px var(--line-strong), var(--shadow-xs);
  --shadow-card:       0 0 0 1px var(--line), var(--shadow-sm);
  --shadow-raised:     0 0 0 1px var(--line), var(--shadow-md);
  --shadow-overlay:    0 0 0 1px var(--line), var(--shadow-lg);
  --shadow-inset-field: inset 0 1px 2px oklch(0% 0 0/.12);

  /* radii */
  --radius-chip:    6px;
  --radius-control: 8px;
  --radius-card:    10px;
  --radius-window:  14px;

  /* motion */
  --ease-out-strong:    cubic-bezier(.23, 1, .32, 1);
  --ease-in-out-strong: cubic-bezier(.77, 0, .175, 1);

  /* type */
  --font-sans: Inter, "Inter var", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Consolas,
               "Sarasa Mono SC", "Microsoft YaHei Mono", monospace;

  /* syntax */
  --c-com:  var(--ink-3);
  --c-str:  oklch(52% .13 149.2);
  --c-kw:   var(--accent-ink);
  --c-num:  oklch(56% .16 41.1);
  --c-typ:  oklch(52% .1 184.7);
  --c-key:  var(--accent);
  --c-var:  oklch(50% .22 302.3);
  --c-flag: oklch(56% .16 41.1);

  color-scheme: light;
}

[data-theme="dark"] {
  --page:        oklch(20.9% .004 264.477);
  --canvas:      oklch(23.1% .004 264.487);
  --surface:     oklch(26% .006 271.191);
  --inset:       oklch(24.3% .004 264.492);
  --field:       oklch(29.3% .006 271.223);
  --hover:       oklch(28.9% .006 271.22);
  --hover-2:     oklch(31.8% .007 274.747);
  --stripe:      oklch(100% 0 0/.055);
  --stripe-bg:   oklch(22.6% .004 264.485);

  --ink:         oklch(96.4% .002 247.839);
  --ink-2:       oklch(73.1% .008 260.731);
  --ink-3:       oklch(54.1% .01 264.484);

  --line:        oklch(30.8% .006 258.354);
  --line-strong: oklch(35.6% .007 264.474);
  --line-soft:   oklch(27.8% .006 258.354);

  --accent:      oklch(68% .173 253.301);
  --accent-ink:  oklch(78.8% .113 248.33);
  --accent-tint: oklch(68% .173 253.301/.16);
  --brand:       oklch(68.2% .18 37.9);
  --brand-tint:  oklch(68.2% .18 37.9/.14);
  --green:       oklch(70.5% .154 153.814);
  --green-tint:  oklch(70.5% .154 153.814/.14);
  --orange:      oklch(74.6% .156 55.642);
  --orange-tint: oklch(74.6% .156 55.642/.14);
  --red:         oklch(66.6% .18 21.433);
  --red-tint:    oklch(66.6% .18 21.433/.14);
  --mark:        oklch(68% .173 253.301/.28);

  --shadow-xs:         0 1px 2px 0 oklch(0% 0 0/.3);
  --shadow-sm:         0 1px 2px oklch(0% 0 0/.24), 0 4px 12px oklch(0% 0 0/.2);
  --shadow-md:         0 2px 6px oklch(0% 0 0/.26), 0 8px 24px oklch(0% 0 0/.22);
  --shadow-lg:         0 8px 28px oklch(0% 0 0/.34), 0 2px 6px oklch(0% 0 0/.24);
  --shadow-hairline:   0 0 0 1px var(--line);
  --shadow-btn:        0 0 0 1px oklch(100% 0 0/.1), 0 1px 2px oklch(0% 0 0/.3);
  --shadow-card:       0 0 0 1px oklch(100% 0 0/.11), 0 1px 2px oklch(0% 0 0/.2), 0 2px 6px oklch(0% 0 0/.2);
  --shadow-raised:     0 0 0 1px oklch(100% 0 0/.13), 0 2px 10px oklch(0% 0 0/.22);
  --shadow-overlay:    0 0 0 1px oklch(100% 0 0/.15), 0 8px 28px oklch(0% 0 0/.34);
  --shadow-inset-field: inset 0 1px 2px oklch(0% 0 0/.4);

  --c-str:  oklch(80% .182 151.7);
  --c-num:  oklch(75.8% .159 55.9);
  --c-typ:  oklch(78.5% .133 181.9);
  --c-var:  oklch(72.2% .177 305.5);
  --c-flag: oklch(75.8% .159 55.9);

  color-scheme: dark;
}

/* -------------------------------------------------------------------- base */
* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: -.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--mark); }

/* 界面外壳不参与文本选择。在顶栏、侧栏、分页这些地方按住鼠标拖动时，浏览器把它
   当成一次跨文档的选择，指针一旦离开视口就一路自动滚动——页面于是自己往上跑。
   正文、代码块和输入框仍然可选。 */
.topbar, .sidebar, .tocpane, .pager, .footer, .kicker,
.chip, .btn, .seg, .nav-group-title, .home-badges, .panel-cap {
  user-select: none;
  -webkit-user-select: none;
}
.topbar input { user-select: text; -webkit-user-select: text; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

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

code, pre, kbd, samp { font-family: var(--font-mono); font-feature-settings: "liga" 0; }

hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }

img { max-width: 100%; height: auto; }

::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 99px;
  border: 3px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--ink-3); background-clip: content-box; }
::-webkit-scrollbar-track { background: transparent; }

/* ------------------------------------------------------------------ topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 52px;
  padding: 0 16px;
  background: color-mix(in srgb, var(--page) 82%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: -.015em;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand-mark { width: 19px; height: 19px; display: block; }
.brand-mark rect, .brand-mark path {
  fill: none;
  stroke: var(--brand);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.brand:hover .brand-mark { animation: mark-tilt .5s var(--ease-out-strong); }
@keyframes mark-tilt { 40% { transform: rotate(-8deg) translateY(-1px); } }

.topbar-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  line-height: 1;
  color: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-chip);
  padding: 3px 5px;
  letter-spacing: .04em;
  flex-shrink: 0;
}

.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }

/* segmented switch — the Beautiful UI theme pill, at toolbar scale */
.seg {
  position: relative;
  display: inline-grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  align-items: center;
  height: 28px;
  padding: 2px;
  border-radius: 99px;
  background: var(--field);
  box-shadow: var(--shadow-inset-field);
  border: 0;
  font: inherit;
  cursor: pointer;
}
.seg > a, .seg > span, .seg > button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 24px;
  padding: 0 9px;
  border-radius: 99px;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: -.005em;
  color: var(--ink-3);
  background: transparent;
  border: 0;
  cursor: pointer;
  white-space: nowrap;
  transition: color .15s var(--ease-out-strong), background-color .15s var(--ease-out-strong);
}
.seg > a:hover, .seg > button:hover { color: var(--ink-2); text-decoration: none; }
.seg .on {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-btn);
}
.seg .on:hover { color: var(--ink); }
.seg .seg-ico { width: 13px; height: 13px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
[data-theme="dark"] .seg-theme .i-sun, [data-theme="light"] .seg-theme .i-moon { display: none; }

.iconbtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-control);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  cursor: pointer;
  transition: color .15s, border-color .15s, background-color .15s;
}
.iconbtn:hover { color: var(--accent); border-color: var(--accent); }
.iconbtn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.menu-btn { display: none; }
.menu-btn-ghost { width: 30px; flex-shrink: 0; }

/* ------------------------------------------------------------------ search */
.search { position: relative; flex: 1; max-width: 360px; }
.search-icon {
  position: absolute; left: 10px; top: 50%; translate: 0 -50%;
  width: 14px; height: 14px; fill: none; stroke: var(--ink-3);
  stroke-width: 1.8; stroke-linecap: round; pointer-events: none;
}
.search input {
  width: 100%; height: 30px; padding: 0 34px 0 30px;
  border: 1px solid var(--line); border-radius: var(--radius-control);
  background: var(--field); color: var(--ink);
  font-family: var(--font-sans); font-size: 12.5px; letter-spacing: -.005em;
  outline: none;
  box-shadow: var(--shadow-inset-field);
  transition: border-color .15s, box-shadow .15s;
}
.search input:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-inset-field), 0 0 0 3px var(--accent-tint);
}
.search input::placeholder { color: var(--ink-3); }
.search kbd {
  position: absolute; right: 8px; top: 50%; translate: 0 -50%;
  font-size: 10px; line-height: 1; color: var(--ink-3);
  border: 1px solid var(--line); border-radius: 4px;
  padding: 3px 4px; background: var(--surface); pointer-events: none;
}
.search input:focus ~ kbd { opacity: 0; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  max-height: min(62vh, 520px); overflow: auto;
  background: var(--surface); border-radius: var(--radius-window);
  box-shadow: var(--shadow-overlay);
  padding: 5px; z-index: 60;
}
.sr-item {
  display: block; padding: 8px 10px;
  border-radius: var(--radius-control);
  color: var(--ink);
}
.sr-item:hover, .sr-item.sel { background: var(--hover); text-decoration: none; }
.sr-item .sr-title { font-size: 12.5px; font-weight: 600; letter-spacing: -.01em; }
.sr-item .sr-head { color: var(--ink-3); font-size: 11px; font-weight: 500; margin-left: 6px; }
.sr-item .sr-snippet {
  color: var(--ink-2); font-size: 11.5px; line-height: 1.5; margin-top: 2px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.sr-item mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
.sr-empty { padding: 16px; color: var(--ink-3); font-size: 12.5px; text-align: center; }

/* ------------------------------------------------------------------- shell */
.frame { max-width: 1200px; margin: 0 auto; background: var(--page); }
@media (min-width: 1201px) {
  .frame { box-shadow: 0 0 0 1px var(--line); }
}

.shell {
  display: grid;
  grid-template-columns: 262px minmax(0, 1fr) 196px;
  align-items: start;
}

.sidebar {
  position: sticky; top: 52px; height: calc(100vh - 52px);
  overflow-y: auto; overscroll-behavior: contain;
  padding: 18px 12px 32px 16px;
  border-right: 1px dashed var(--line);
}
.sidebar-inner { display: flex; flex-direction: column; gap: 1px; }
.nav-group { margin-top: 16px; }
.nav-group-title {
  font-size: 11.5px; color: var(--ink-3); margin: 0 0 6px 8px;
  letter-spacing: -.005em;
}
.nav-link {
  position: relative; display: flex; align-items: center; gap: 7px;
  min-height: 28px; padding: 5px 8px;
  border-radius: 7px;
  color: var(--ink-2); font-size: 12.5px; font-weight: 500;
  letter-spacing: -.01em; line-height: 1.45;
  transition: color .12s, background-color .12s;
}
.nav-link:hover { color: var(--ink); background: var(--hover); text-decoration: none; }
.nav-link.active { color: var(--ink); background: var(--hover-2); }
.nav-link.active::before {
  content: ""; position: absolute; left: -8px; top: 50%; translate: 0 -50%;
  width: 2px; height: 14px; border-radius: 2px; background: var(--accent);
}
.nav-home { color: var(--ink); font-weight: 600; }
.nav-num {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-3);
  min-width: 15px; flex-shrink: 0; font-variant-numeric: tabular-nums;
}
.nav-link.active .nav-num { color: var(--accent); }
.sidebar-foot {
  margin: 22px 8px 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono); font-size: 10.5px; line-height: 1.7;
  color: var(--ink-3);
}
.sidebar-foot a { color: var(--ink-2); }
.scrim { display: none; }

/* ----------------------------------------------------------------- content */
.content { padding: 34px 40px 24px; min-width: 0; }

.kicker {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 500;
  color: var(--ink-3); letter-spacing: .02em;
  margin-bottom: 12px;
}
.kicker::before {
  content: ""; width: 5px; height: 5px; border-radius: 2px;
  background: var(--brand); flex-shrink: 0;
}

/* ------------------------------------------------------------------- prose */
.prose { font-size: 14.5px; line-height: 1.75; color: var(--ink); }
.prose > :first-child { margin-top: 0; }

.prose h1 {
  font-size: 26px; line-height: 1.25; font-weight: 600;
  letter-spacing: -.025em; margin: 0 0 20px;
}
.prose h2 {
  font-size: 19.5px; line-height: 1.35; font-weight: 600;
  letter-spacing: -.02em; margin: 40px 0 12px;
  padding-top: 20px; border-top: 1px dashed var(--line);
}
.prose h2:first-of-type { padding-top: 0; border-top: 0; }
.prose h3 {
  font-size: 15.5px; font-weight: 600; letter-spacing: -.015em;
  margin: 28px 0 8px;
}
.prose h4 { font-size: 14px; font-weight: 600; margin: 22px 0 6px; }
.prose h5, .prose h6 { font-size: 13.5px; font-weight: 600; margin: 18px 0 6px; color: var(--ink-2); }

.anchor {
  opacity: 0; margin-left: 8px; font-weight: 400; font-size: .78em;
  color: var(--ink-3); transition: opacity .15s;
}
h1:hover .anchor, h2:hover .anchor, h3:hover .anchor, h4:hover .anchor { opacity: 1; }

.prose p { margin: 11px 0; }
.prose ul, .prose ol { margin: 10px 0; padding-left: 22px; }
.prose li { margin: 5px 0; }
.prose li::marker { color: var(--ink-3); }
.prose li > ul, .prose li > ol { margin: 4px 0; }
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; color: var(--ink-2); }

.prose blockquote {
  margin: 16px 0; padding: 12px 16px;
  background: var(--inset);
  border-left: 2px solid var(--brand);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  color: var(--ink-2); font-size: 13.5px; line-height: 1.7;
}
.prose blockquote p { margin: 6px 0; }
.prose blockquote p:first-child { margin-top: 0; }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose blockquote strong { color: var(--ink); }

p code, li code, td code, th code, blockquote code, h1 code, h2 code, h3 code, h4 code {
  font-size: .85em;
  padding: 2px 5px;
  border-radius: var(--radius-chip);
  background: var(--inset);
  box-shadow: 0 0 0 1px var(--line);
  color: var(--ink);
  white-space: nowrap;
  letter-spacing: -.005em;
}
h1 code, h2 code, h3 code, h4 code { font-size: .82em; }

/* ------------------------------------------------------------------ tables */
.tablewrap {
  margin: 16px 0;
  border-radius: var(--radius-window);
  box-shadow: var(--shadow-hairline);
  overflow: hidden;
}
.tablewrap { overflow-x: auto; }
.prose table {
  border-collapse: collapse; width: 100%;
  font-size: 13px; line-height: 1.55;
  background: var(--surface);
}
.prose th, .prose td {
  padding: 9px 12px; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.prose thead th {
  font-size: 12px; font-weight: 500; color: var(--ink-3);
  background: var(--inset); white-space: nowrap;
}
.prose tbody tr:last-child td { border-bottom: 0; }
.prose tbody tr { transition: background-color .12s; }
.prose tbody tr:hover { background: var(--hover); }
.prose td code, .prose th code { white-space: normal; }

/* ------------------------------------------------------------- code blocks */
.codeblock { position: relative; margin: 16px 0; }
.codeblock pre {
  margin: 0; padding: 14px 16px;
  overflow-x: auto;
  background: var(--inset);
  border-radius: var(--radius-window);
  box-shadow: var(--shadow-hairline);
  font-size: 12.5px; line-height: 1.65; letter-spacing: -.005em;
  tab-size: 4;
}
.codeblock pre code { background: none; box-shadow: none; padding: 0; white-space: pre; }
.codeblock[data-lang]::before {
  content: attr(data-lang);
  position: absolute; top: 9px; right: 40px; z-index: 2;
  font-family: var(--font-mono); font-size: 9.5px; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink-3);
  padding: 3px 6px; border-radius: var(--radius-chip);
  background: var(--surface); box-shadow: var(--shadow-hairline);
  pointer-events: none;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px; z-index: 3;
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  border-radius: var(--radius-chip);
  border: 0; background: var(--surface); color: var(--ink-3);
  box-shadow: var(--shadow-hairline);
  cursor: pointer; opacity: 0;
  font-size: 12px; line-height: 1;
  transition: opacity .15s, color .15s, transform .15s var(--ease-out-strong);
}
.codeblock:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--accent); }
.copy-btn:active { transform: scale(.94); }
.copy-btn.ok { color: var(--green); opacity: 1; }
.c-com { color: var(--c-com); font-style: italic; }
.c-str { color: var(--c-str); }
.c-kw { color: var(--c-kw); font-weight: 600; }
.c-num { color: var(--c-num); }
.c-typ { color: var(--c-typ); }
.c-key { color: var(--c-key); }
.c-var { color: var(--c-var); }
.c-flag { color: var(--c-flag); }

/* --------------------------------------------------------------------- toc */
.tocpane {
  position: sticky; top: 52px; height: calc(100vh - 52px);
  overflow-y: auto; overscroll-behavior: contain;
  padding: 34px 16px 32px 4px;
}
.toc-title {
  font-size: 11.5px; color: var(--ink-3);
  margin-bottom: 10px; letter-spacing: -.005em;
}
.toc a {
  display: block; color: var(--ink-2);
  font-size: 12px; line-height: 1.5; letter-spacing: -.008em;
  padding: 3.5px 0 3.5px 11px;
  border-left: 1px solid var(--line);
  transition: color .12s, border-color .12s;
}
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a.toc-l3 { padding-left: 22px; font-size: 11.5px; color: var(--ink-3); }
.toc a.toc-l3:hover { color: var(--ink-2); }
.toc a.here { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }

/* ------------------------------------------------------------ pager/footer */
.pager { display: flex; gap: 12px; margin: 44px 0 16px; }
.pager a {
  display: flex; flex-direction: column; gap: 2px;
  max-width: 48%; padding: 12px 15px;
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-hairline);
  color: var(--ink);
  transition: box-shadow .15s var(--ease-out-strong), transform .15s var(--ease-out-strong);
}
.pager a:hover {
  text-decoration: none;
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
  transform: translateY(-1px);
}
.pager small { color: var(--ink-3); font-size: 10.5px; letter-spacing: .02em; }
.pager b { font-size: 13px; font-weight: 600; letter-spacing: -.012em; }
.pager-prev { align-items: flex-start; }
.pager-next { align-items: flex-end; text-align: right; margin-left: auto; }
.pager > span { flex: 1; }

.footer {
  color: var(--ink-3); font-size: 12px;
  padding: 20px 0 30px;
  border-top: 1px dashed var(--line);
  margin-top: 8px;
}
.footer code { font-size: 11px; }
.footer a { color: var(--ink-2); }

/* --------------------------------------------------------------- utilities */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  height: 22px; padding: 0 8px;
  border-radius: 99px;
  background: var(--field);
  box-shadow: var(--shadow-inset-field);
  font-size: 11px; font-weight: 500; color: var(--ink-2);
  letter-spacing: -.005em;
  white-space: nowrap;
}
.chip-accent { background: var(--accent-tint); color: var(--accent-ink); box-shadow: none; }
.chip-brand { background: var(--brand-tint); color: var(--brand); box-shadow: none; }
.chip-green { background: var(--green-tint); color: var(--green); box-shadow: none; }
.chip-orange { background: var(--orange-tint); color: var(--orange); box-shadow: none; }
.chip-red { background: var(--red-tint); color: var(--red); box-shadow: none; }
.chip-mono { font-family: var(--font-mono); font-size: 10.5px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 34px; padding: 0 14px;
  border-radius: 99px;
  border: 0;
  font-family: inherit; font-size: 13px; font-weight: 500; letter-spacing: -.01em;
  background: var(--surface); color: var(--ink);
  box-shadow: var(--shadow-btn);
  cursor: pointer;
  transition: transform .15s var(--ease-out-strong), box-shadow .15s, background-color .15s;
}
.btn:hover { text-decoration: none; background: var(--hover); }
.btn:active { transform: scale(.97); }
.btn-primary {
  background: var(--accent); color: oklch(100% 0 0);
  box-shadow: 0 0 0 1px var(--accent), inset 0 1px 0 oklch(100% 0 0/.16);
}
.btn-primary:hover { background: var(--accent-ink); box-shadow: 0 0 0 1px var(--accent-ink), inset 0 1px 0 oklch(100% 0 0/.16); }
.btn-arrow { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ------------------------------------------------------------------- home */
.home-hero { padding: 52px 40px 8px; }
.home-hero-inner {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px; align-items: center;
}
/* grid children default to min-width:auto, so a <pre> inside one refuses to
   shrink and pushes the whole page wider than the viewport. */
.home-hero-inner > * { min-width: 0; }
.home-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.home-hero h1 {
  font-size: clamp(38px, 5.2vw, 56px);
  line-height: 1; font-weight: 600; letter-spacing: -.045em;
  margin: 0 0 16px;
}
.home-hero h1 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--brand) 0%, var(--accent) 92%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.home-lede { font-size: 15px; line-height: 1.75; color: var(--ink); margin: 0; }
.home-cta { display: flex; gap: 8px; margin-top: 22px; flex-wrap: wrap; }

.panel {
  background: var(--canvas);
  border-radius: var(--radius-window);
  box-shadow: var(--shadow-hairline);
  padding: 12px;
}
/* 框架图在面板里居中：pre 收缩到内容宽度，再由 auto 外边距摆正。 */
.panel-pre {
  margin: 0 auto; width: fit-content; max-width: 100%;
  overflow-x: auto; font-size: 9.5px; line-height: 1.34;
}
.panel-pre code {
  font-family: var(--font-mono);
  color: var(--ink-2); white-space: pre;
}
.panel-cap {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin: 10px 2px 0;
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);
}

.home-section { padding: 34px 40px; border-top: 1px dashed var(--line); }
.home-section-head { margin-bottom: 16px; }
.home-section h2 {
  font-size: 19.5px; font-weight: 600; letter-spacing: -.02em;
  margin: 0 0 5px;
}
.home-section-sub { color: var(--ink-2); font-size: 13px; margin: 0; line-height: 1.65; }

.grid-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 10px; }
.card {
  padding: 14px 16px;
  background: var(--surface);
  border-radius: var(--radius-window);
  box-shadow: var(--shadow-hairline);
  transition: box-shadow .15s var(--ease-out-strong), transform .15s var(--ease-out-strong);
}
.card:hover { box-shadow: 0 0 0 1px var(--line-strong), var(--shadow-sm); }
.card h3 {
  margin: 0 0 4px; font-size: 13.5px; font-weight: 600; letter-spacing: -.012em;
  display: flex; align-items: center; gap: 6px;
}
.card p { margin: 0; font-size: 12.5px; line-height: 1.65; color: var(--ink-2); }
.card p + p { margin-top: 5px; color: var(--ink-3); font-size: 12px; }

.doc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(216px, 1fr)); gap: 10px; }
.doc-card {
  position: relative;
  display: flex; flex-direction: column; gap: 2px;
  padding: 13px 15px 12px;
  background: var(--surface);
  border-radius: var(--radius-window);
  box-shadow: var(--shadow-hairline);
  color: var(--ink);
  transition: box-shadow .15s var(--ease-out-strong), transform .15s var(--ease-out-strong);
}
.doc-card:hover {
  text-decoration: none;
  box-shadow: 0 0 0 1px var(--accent), var(--shadow-sm);
  transform: translateY(-2px);
}
.doc-card-top { display: flex; align-items: center; gap: 7px; }
.doc-card-num {
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.doc-card-title { font-size: 13.5px; font-weight: 600; letter-spacing: -.012em; }
.doc-card-desc { color: var(--ink-2); font-size: 12px; line-height: 1.6; margin-top: 6px; }
.doc-card-go {
  position: absolute; right: 13px; top: 13px;
  color: var(--ink-3); font-size: 12px;
  transition: transform .15s var(--ease-out-strong), color .15s;
}
.doc-card:hover .doc-card-go { transform: translateX(2px); color: var(--accent); }

/* ------------------------------------------------------- deployment page */
.deploy-steps { counter-reset: step; margin: 18px 0; padding: 0; list-style: none; }
.deploy-steps > li {
  position: relative;
  padding: 0 0 18px 40px;
  border-left: 1px dashed var(--line);
  margin-left: 12px;
}
.deploy-steps > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.deploy-steps > li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: -13px; top: -2px;
  display: flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  border-radius: 99px;
  background: var(--surface); color: var(--ink-2);
  box-shadow: var(--shadow-hairline);
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
}
.deploy-steps > li > strong:first-child { display: block; font-size: 14px; margin-bottom: 6px; letter-spacing: -.012em; }

.note {
  display: flex; gap: 10px;
  margin: 16px 0; padding: 12px 14px;
  border-radius: var(--radius-card);
  background: var(--inset);
  box-shadow: var(--shadow-hairline);
  font-size: 13px; line-height: 1.7; color: var(--ink-2);
}
.note p { margin: 4px 0; }
.note p:first-child { margin-top: 0; }
.note p:last-child { margin-bottom: 0; }
.note strong { color: var(--ink); }
.note-ico { flex-shrink: 0; font-family: var(--font-mono); font-size: 12px; color: var(--brand); line-height: 1.7; }
.note-warn .note-ico { color: var(--orange); }

.kv { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 16px; font-size: 13px; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; }

/* ------------------------------------------------------------- responsive */
@media (max-width: 1150px) {
  .shell { grid-template-columns: 244px minmax(0, 1fr); }
  .tocpane { display: none; }
}
@media (max-width: 900px) {
  .home-hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .home-hero { padding-top: 34px; }
  .menu-btn { display: inline-flex; }
  .menu-btn-ghost { display: none; }
  .topbar-tag { display: none; }
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; height: 100vh; z-index: 80;
    width: 272px; background: var(--page);
    transform: translateX(-102%);
    transition: transform .22s var(--ease-out-strong);
    border-right: 1px solid var(--line);
    box-shadow: var(--shadow-overlay);
    padding-top: 18px;
  }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: 0; background: oklch(0% 0 0/.5); z-index: 70; }
  .content, .home-hero, .home-section { padding-left: 22px; padding-right: 22px; }
}
@media (max-width: 620px) {
  .search { max-width: none; }
  .search kbd { display: none; }
  .search input { padding-right: 12px; }
  .brand span { display: none; }
  .seg > a, .seg > span, .seg > button { padding: 0 7px; }
  .prose h1 { font-size: 22px; }
  .prose h2 { font-size: 17.5px; }
  .home-hero h1 { font-size: 36px; }
  .pager a { max-width: none; }
  .pager { flex-direction: column; }
  .pager-next { margin-left: 0; align-items: flex-start; text-align: left; }
}

@media print {
  .topbar, .sidebar, .tocpane, .pager, .copy-btn, .scrim, .home-cta { display: none !important; }
  .shell { display: block; }
  .content { padding: 0; }
  body { background: #fff; color: #000; }
  .codeblock pre, .tablewrap { box-shadow: 0 0 0 1px #ccc; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}