:root {
  --accent: #e551ba;
  --accent-soft: #fdf0f9;
  --accent-line: #f5c9e8;
  --ink: #14161a;
  --ink-2: #3d434d;
  --ink-3: #6b7280;
  --ink-4: #9aa1ac;
  --line: #e8eaee;
  --line-2: #f1f3f6;
  --bg: #ffffff;
  --bg-2: #fafbfc;
  --bg-code: #f8f9fb;
  --sidebar-w: 18rem;
  --toc-w: 15rem;
  --topbar-h: 3.5rem;
  --radius: 10px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 1rem); }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ------------------------------------------------------------------ topbar */

.topbar {
  position: fixed; inset: 0 0 auto 0; height: var(--topbar-h); z-index: 40;
  display: flex; align-items: center; gap: 1rem;
  padding: 0 1.25rem;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .6rem; color: var(--ink); font-weight: 650; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 1.7rem; height: 1.7rem; border-radius: 7px;
  background: var(--accent); color: #fff; font-size: .72rem; font-weight: 800; letter-spacing: .02em;
}
.brand-text { font-size: .95rem; display: flex; align-items: baseline; gap: .4rem; }
.brand-text em { font-style: normal; font-size: .75rem; color: var(--ink-3); font-weight: 500; }

.search-box { position: relative; flex: 1; max-width: 26rem; margin-left: auto; }
#search-input {
  width: 100%; height: 2.1rem; padding: 0 .8rem;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg-2);
  font: inherit; font-size: .875rem; color: var(--ink);
}
#search-input:focus { outline: none; border-color: var(--accent-line); background: #fff; box-shadow: 0 0 0 3px var(--accent-soft); }
.search-results {
  position: absolute; top: calc(100% + .4rem); left: 0; right: 0; max-height: 26rem; overflow-y: auto;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(20, 22, 26, .12); padding: .35rem;
}
.sr-item { display: block; padding: .5rem .6rem; border-radius: 7px; color: var(--ink); }
.sr-item:hover, .sr-item.sel { background: var(--accent-soft); text-decoration: none; }
.sr-title { font-weight: 600; font-size: .875rem; }
.sr-title mark { background: #ffe9a8; color: inherit; border-radius: 3px; padding: 0 2px; }
.sr-sub { font-size: .75rem; color: var(--ink-3); margin-top: .1rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sr-empty { padding: .7rem; color: var(--ink-3); font-size: .85rem; }

.src-link { font-size: .8rem; color: var(--ink-3); white-space: nowrap; }
.menu-toggle {
  display: none; width: 2rem; height: 2rem; border: 1px solid var(--line); background: #fff;
  border-radius: 7px; font-size: 1rem; cursor: pointer; color: var(--ink-2);
}

/* ------------------------------------------------------------------ shell */

.shell { display: flex; padding-top: var(--topbar-h); }

.sidebar {
  position: fixed; top: var(--topbar-h); bottom: 0; left: 0; width: var(--sidebar-w);
  overflow-y: auto; padding: 1.25rem .9rem 3rem;
  border-right: 1px solid var(--line); background: var(--bg-2);
}
.nav-group-label {
  margin: 1.15rem 0 .35rem; padding: 0 .55rem;
  font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-4);
}
.nav-group-label:first-child { margin-top: 0; }
.nav-link {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .3rem .55rem; border-radius: 7px; color: var(--ink-2);
  font-size: .875rem; line-height: 1.5;
}
.nav-link:hover { background: #fff; color: var(--ink); text-decoration: none; }
.nav-link.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.nav-badge {
  font-size: .62rem; padding: .05rem .3rem; border-radius: 4px;
  background: #eef0f4; color: var(--ink-3); font-weight: 600; white-space: nowrap;
}
.nav-link.active .nav-badge { background: #fff; color: var(--accent); }
.nav-sub > summary {
  cursor: pointer; list-style: none; padding: .35rem .55rem; border-radius: 7px;
  font-size: .875rem; font-weight: 600; color: var(--ink-2);
  display: flex; align-items: center; gap: .4rem;
}
.nav-sub > summary::-webkit-details-marker { display: none; }
.nav-sub > summary::before {
  content: "▸"; font-size: .7rem; color: var(--ink-4); transition: transform .15s;
}
.nav-sub[open] > summary::before { transform: rotate(90deg); }
.nav-sub > summary:hover { background: #fff; }
.nav-sub-body { margin: .1rem 0 .3rem .6rem; padding-left: .5rem; border-left: 1px solid var(--line); }
.nav-parent { font-weight: 600; }

.content { flex: 1; min-width: 0; margin-left: var(--sidebar-w); padding: 2.5rem 3rem 6rem; max-width: 60rem; }
.toc {
  width: var(--toc-w); flex: 0 0 var(--toc-w); padding: 2.5rem 1.25rem 4rem 0;
  position: sticky; top: var(--topbar-h); align-self: flex-start; max-height: calc(100vh - var(--topbar-h)); overflow-y: auto;
}
.toc-title { font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-4); margin-bottom: .5rem; }
.toc a { display: block; font-size: .8rem; color: var(--ink-3); padding: .18rem 0; line-height: 1.5; }
.toc a:hover { color: var(--accent); text-decoration: none; }
.toc-l3 { padding-left: .85rem !important; }
.toc a.active { color: var(--accent); font-weight: 600; }

/* ------------------------------------------------------------------ article */

.doc { max-width: 46rem; }
.doc > *:first-child { margin-top: 0; }

.doc h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 1rem; letter-spacing: -.02em; font-weight: 700; }
.doc h2 { font-size: 1.4rem; margin: 2.5rem 0 .9rem; padding-top: .3rem; letter-spacing: -.01em; font-weight: 650; }
.doc h3 { font-size: 1.1rem; margin: 1.9rem 0 .7rem; font-weight: 650; }
.doc h4 { font-size: .98rem; margin: 1.5rem 0 .5rem; font-weight: 650; color: var(--ink-2); }
.doc h5, .doc h6 { font-size: .92rem; margin: 1.2rem 0 .4rem; color: var(--ink-2); }

.anchor { float: left; margin-left: -1.1em; padding-right: .25em; color: var(--line); font-weight: 400; opacity: 0; }
.doc h2:hover .anchor, .doc h3:hover .anchor, .doc h4:hover .anchor { opacity: 1; }
.anchor:hover { text-decoration: none; color: var(--accent); }

.doc p { margin: .85rem 0; color: var(--ink-2); }
.doc strong { color: var(--ink); font-weight: 650; }
.doc ul, .doc ol { margin: .8rem 0; padding-left: 1.35rem; color: var(--ink-2); }
.doc li { margin: .3rem 0; }
.doc li > ul, .doc li > ol { margin: .3rem 0; }
.doc hr { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.doc blockquote {
  margin: 1.1rem 0; padding: .7rem 1rem; border-left: 3px solid var(--accent-line);
  background: var(--accent-soft); border-radius: 0 8px 8px 0; color: var(--ink-2);
}
.doc blockquote p { margin: .25rem 0; }

.doc :not(pre) > code {
  font-family: var(--mono); font-size: .855em; padding: .13em .38em;
  background: var(--bg-code); border: 1px solid var(--line-2); border-radius: 5px; color: #b3327f;
  word-break: break-word;
}

.doc table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: .875rem; display: block; overflow-x: auto; }
.doc th, .doc td { border: 1px solid var(--line); padding: .5rem .7rem; text-align: left; vertical-align: top; }
.doc th { background: var(--bg-2); font-weight: 650; white-space: nowrap; }
.doc tbody tr:nth-child(even) { background: #fcfdfe; }

/* code blocks */

figure.code {
  margin: 1.2rem 0; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--bg-code);
}
figure.code figcaption {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .35rem .7rem; background: #fff; border-bottom: 1px solid var(--line);
  font-size: .72rem; color: var(--ink-3);
}
.code-lang { font-family: var(--mono); letter-spacing: .02em; }
.copy {
  border: 1px solid var(--line); background: #fff; color: var(--ink-3); cursor: pointer;
  font: inherit; font-size: .7rem; padding: .1rem .45rem; border-radius: 5px;
}
.copy:hover { color: var(--accent); border-color: var(--accent-line); }
figure.code pre {
  margin: 0; padding: .85rem 1rem; overflow-x: auto; font-family: var(--mono);
  font-size: .82rem; line-height: 1.65; color: #24292f; tab-size: 2;
}
figure.code code { display: block; }
.cl { display: block; padding: 0 .2rem; margin: 0 -.2rem; }
.cl.hl { background: #fff6d9; }

/* highlight.js — GitHub-ish light theme */
.hljs-comment, .hljs-quote { color: #6a737d; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-type { color: #d73a49; }
.hljs-string, .hljs-regexp, .hljs-addition { color: #032f62; }
.hljs-number, .hljs-symbol, .hljs-bullet { color: #005cc5; }
.hljs-title, .hljs-section, .hljs-name { color: #6f42c1; }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable { color: #e36209; }
.hljs-built_in, .hljs-class .hljs-title { color: #005cc5; }
.hljs-meta, .hljs-deletion { color: #b31d28; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ------------------------------------------------------------------ components */

.callout {
  margin: 1.2rem 0; padding: .8rem 1rem .8rem 1rem; border-radius: var(--radius);
  border: 1px solid var(--line); border-left: 3px solid var(--ink-4); background: var(--bg-2);
}
.callout-label { font-size: .72rem; font-weight: 700; letter-spacing: .06em; color: var(--ink-3); margin-bottom: .3rem; }
.callout-body > *:first-child { margin-top: 0; }
.callout-body > *:last-child { margin-bottom: 0; }
.callout-note { border-left-color: #8b93a1; background: #f8f9fb; }
.callout-tip { border-left-color: #2fa36b; background: #f2fbf6; }
.callout-tip .callout-label { color: #237a50; }
.callout-warning { border-left-color: #e0a53c; background: #fffaf0; }
.callout-warning .callout-label { color: #9a6a12; }
.callout-info { border-left-color: #4a8fe0; background: #f3f8ff; }
.callout-info .callout-label { color: #2f6bb0; }

details.accordion {
  margin: .7rem 0; border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
}
details.accordion > summary {
  cursor: pointer; padding: .6rem .9rem; font-weight: 600; font-size: .9rem; color: var(--ink);
  display: flex; align-items: center; gap: .5rem; list-style: none;
}
details.accordion > summary::-webkit-details-marker { display: none; }
details.accordion > summary::before { content: "▸"; font-size: .72rem; color: var(--ink-4); transition: transform .15s; }
details.accordion[open] > summary::before { transform: rotate(90deg); }
details.accordion[open] > summary { border-bottom: 1px solid var(--line-2); }
.accordion-body { padding: .8rem .9rem; }
.accordion-body > *:first-child { margin-top: 0; }
.accordion-body > *:last-child { margin-bottom: 0; }
.accordion-group > details.accordion:first-child { margin-top: 1.2rem; }

ol.steps { list-style: none; counter-reset: step; padding-left: 0; margin: 1.3rem 0; }
li.step {
  counter-increment: step; position: relative; padding-left: 2.4rem; padding-bottom: 1.4rem;
  border-left: 1px solid var(--line); margin-left: .85rem;
}
li.step:last-child { border-left-color: transparent; padding-bottom: 0; }
li.step::before {
  content: counter(step); position: absolute; left: -0.85rem; top: 0;
  width: 1.7rem; height: 1.7rem; border-radius: 50%; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-size: .75rem; font-weight: 700;
}
.step-title { font-weight: 650; font-size: 1rem; margin-bottom: .4rem; }
.step-body > *:first-child { margin-top: 0; }

.tabs { margin: 1.2rem 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.tab-bar { display: flex; gap: .15rem; padding: .35rem .35rem 0; background: var(--bg-2); border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab-bar button {
  border: none; background: transparent; font: inherit; font-size: .82rem; color: var(--ink-3);
  padding: .4rem .8rem; border-radius: 7px 7px 0 0; cursor: pointer; white-space: nowrap;
}
.tab-bar button.active { background: #fff; color: var(--accent); font-weight: 650; box-shadow: 0 -1px 0 var(--line) inset, 1px 0 0 var(--line) inset, -1px 0 0 var(--line) inset; }
.tab-panel { display: none; padding: .9rem 1rem; }
.tab-panel.active { display: block; }
.tab-panel > *:first-child { margin-top: 0; }
.tab-panel > *:last-child { margin-bottom: 0; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: .8rem; margin: 1.3rem 0; }
.card {
  display: block; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
.card:hover { text-decoration: none; border-color: var(--accent-line); box-shadow: 0 4px 14px rgba(229, 81, 186, .09); }
.card-title { display: block; font-weight: 650; font-size: .95rem; }
.card-desc { display: block; font-size: .82rem; color: var(--ink-3); margin-top: .25rem; }
.card-desc p { margin: .2rem 0; font-size: .82rem; }

.field {
  margin: .55rem 0; padding: .65rem .85rem; border: 1px solid var(--line);
  border-radius: 8px; background: #fff;
}
.field-head { display: flex; flex-wrap: wrap; align-items: center; gap: .45rem; margin-bottom: .35rem; }
.field-name { font-family: var(--mono); font-size: .82rem; font-weight: 650; color: #b3327f; background: var(--accent-soft); border-color: var(--accent-line); }
.field-type { font-family: var(--mono); font-size: .76rem; color: var(--ink-3); }
.field-req { font-size: .68rem; font-weight: 700; color: #b45309; background: #fff7e6; padding: .05rem .35rem; border-radius: 4px; }
.field-dep { font-size: .68rem; font-weight: 700; color: #b91c1c; background: #fef2f2; padding: .05rem .35rem; border-radius: 4px; }
.field-body > *:first-child { margin-top: 0; }
.field-body > *:last-child { margin-bottom: 0; }
.field-body p { font-size: .875rem; }

.badge {
  display: inline-block; font-size: .7rem; font-weight: 650; padding: .1rem .4rem; border-radius: 5px;
  background: #eef0f4; color: var(--ink-2); vertical-align: middle;
}
.badge-blue { background: #e8f1fd; color: #2563eb; }
.badge-green { background: #e8f8ee; color: #15803d; }
.badge-yellow { background: #fdf6e3; color: #a16207; }
.badge-red { background: #fdecec; color: #b91c1c; }
.badge-purple { background: var(--accent-soft); color: var(--accent); }
.check { color: #15803d; font-weight: 700; }

figure.frame { margin: 1.2rem 0; }
figure.frame figcaption { font-size: .78rem; color: var(--ink-3); text-align: center; margin-top: .4rem; }
.panel, .code-group { margin: 1rem 0; }
.update { margin: 1rem 0; padding: .7rem .9rem; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--line); }
.update-label { font-size: .72rem; font-weight: 700; color: var(--accent); margin-bottom: .3rem; }

.mermaid-wrap { margin: 1.3rem 0; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow-x: auto; text-align: center; }
.mermaid-wrap svg { max-width: 100%; height: auto; }
.mermaid:not([data-processed]) { color: transparent; }

.ts-example { margin: 1.2rem 0; }
.ts-example-note { font-size: .78rem; color: var(--ink-3); margin: .35rem 0 0; }

/* ------------------------------------------------------------------ responsive */

@media (max-width: 1200px) { .toc { display: none; } }
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 45; box-shadow: 0 0 0 100vmax rgba(0,0,0,0); }
  body.nav-open .sidebar { transform: none; box-shadow: 0 10px 40px rgba(0,0,0,.14); }
  .content { margin-left: 0; padding: 1.5rem 1.1rem 4rem; }
  .brand-text em { display: none; }
  .src-link { display: none; }
  .search-box { max-width: none; }
}
@media print {
  .topbar, .sidebar, .toc, .copy { display: none !important; }
  .content { margin: 0; padding: 0; max-width: none; }
}