:root {
  --bg: #ffffff;
  --bg-alt: #f6f6f7;
  --bg-soft: #f6f6f7;
  --bg-mute: #f1f1f2;
  --bg-elv: #ffffff;
  --divider: #e2e2e3;
  --t1: rgba(60, 60, 67, 1);
  --t2: rgba(60, 60, 67, 0.78);
  --t3: rgba(60, 60, 67, 0.56);
  --brand-1: #3451b2;
  --brand-2: #3a5ccc;
  --brand-3: #5672cd;
  --brand-soft: rgba(100, 108, 255, 0.14);
  --green-1: #18794e;
  --green-soft: rgba(16, 185, 129, 0.14);
  --yellow-1: #915930;
  --yellow-soft: rgba(234, 179, 8, 0.14);
  --red-1: #b8272c;
  --red-soft: rgba(244, 63, 94, 0.14);
  --gray-1: #565a5f;
  --gray-soft: rgba(142, 150, 170, 0.14);
  --mark: rgba(234, 179, 8, 0.32);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --font: "Inter", "Noto Sans TC", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang HK", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --nav-h: 64px;
  --side-w: 280px;
  color-scheme: light;
}
html.dark {
  --bg: #1b1b1f;
  --bg-alt: #161618;
  --bg-soft: #202127;
  --bg-mute: #2b2b2f;
  --bg-elv: #202127;
  --divider: #2e2e32;
  --t1: rgba(255, 255, 245, 0.86);
  --t2: rgba(235, 235, 245, 0.6);
  --t3: rgba(235, 235, 245, 0.38);
  --brand-1: #a8b1ff;
  --brand-2: #5c73e7;
  --brand-3: #3e63dd;
  --brand-soft: rgba(100, 108, 255, 0.16);
  --green-1: #3dd68c;
  --green-soft: rgba(16, 185, 129, 0.16);
  --yellow-1: #f9b44e;
  --yellow-soft: rgba(234, 179, 8, 0.16);
  --red-1: #f66f81;
  --red-soft: rgba(244, 63, 94, 0.16);
  --gray-1: #a4a8ae;
  --gray-soft: rgba(142, 150, 170, 0.16);
  --mark: rgba(234, 179, 8, 0.28);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--t1);
  font: 14px/1.7 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand-1); text-decoration: none; }
a:hover { color: var(--brand-2); text-decoration: underline; text-underline-offset: 2px; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--brand-1); outline-offset: 2px; border-radius: 4px; }
mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
[hidden] { display: none !important; }

.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 30;
  background: var(--bg); border-bottom: 1px solid var(--divider);
}
.nav-in { height: 100%; display: flex; align-items: center; gap: 12px; padding: 0 20px; }
.title { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; color: var(--t1); white-space: nowrap; }
.title:hover { text-decoration: none; color: var(--t1); }
.logo {
  width: 24px; height: 24px; border-radius: 6px;
  background: linear-gradient(135deg, var(--brand-3), var(--brand-1));
  display: grid; place-items: center; color: #fff;
}
.logo svg { width: 15px; height: 15px; }
.search { flex: 1; max-width: 440px; margin-left: auto; position: relative; }
.search input {
  width: 100%; height: 40px; padding: 0 44px 0 40px; border-radius: 8px;
  border: 1px solid transparent; background: var(--bg-alt); color: var(--t1); font: inherit;
}
.search input:hover { border-color: var(--divider); }
.search input:focus { outline: 0; border-color: var(--brand-1); background: var(--bg); }
.search input::placeholder { color: var(--t3); }
.search svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; fill: none; stroke: var(--t3); stroke-width: 2; pointer-events: none;
}
.search kbd {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  font: 500 11px/1 var(--font); color: var(--t3); border: 1px solid var(--divider);
  border-radius: 4px; padding: 3px 6px; background: var(--bg-elv); pointer-events: none;
}
.nav-r { display: flex; align-items: center; gap: 6px; flex: none; }
.seg {
  display: flex; border: 1px solid var(--divider); border-radius: 8px; overflow: hidden; background: var(--bg-alt);
}
.seg button {
  padding: 5px 10px; font-size: 12px; font-weight: 600; color: var(--t2); line-height: 20px;
}
.seg button[aria-pressed="true"] { background: var(--brand-soft); color: var(--brand-1); }
.seg button:hover { color: var(--t1); }
.icon-btn {
  width: 36px; height: 36px; border-radius: 8px; display: grid; place-items: center; color: var(--t2);
}
.icon-btn:hover { background: var(--bg-soft); color: var(--t1); }
.icon-btn svg { width: 20px; height: 20px; fill: currentColor; }
.switch {
  position: relative; width: 40px; height: 22px; border-radius: 11px;
  border: 1px solid var(--divider); background: var(--bg-mute); flex: none;
}
.switch .knob {
  position: absolute; top: 1px; left: 1px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg-elv); box-shadow: var(--shadow); transition: transform .25s;
  display: grid; place-items: center;
}
html.dark .switch .knob { transform: translateX(18px); }
.switch svg { width: 12px; height: 12px; fill: var(--t2); }
.switch .sun { display: block; } .switch .moon { display: none; }
html.dark .switch .sun { display: none; } html.dark .switch .moon { display: block; }
.menu-btn { display: none; }

.sidebar {
  position: fixed; top: var(--nav-h); bottom: 0; left: 0; width: var(--side-w);
  background: var(--bg-alt); padding: 28px 24px 96px; overflow-y: auto; z-index: 20;
}
.group { padding-bottom: 18px; margin-bottom: 18px; border-bottom: 1px solid var(--divider); }
.group:last-of-type { border-bottom: 0; }
.gt { font-size: 14px; font-weight: 700; color: var(--t1); line-height: 24px; margin-bottom: 4px; display: flex; justify-content: space-between; align-items: baseline; }
.gt small { font-weight: 400; font-size: 12px; color: var(--t3); }
.sec-links { display: flex; flex-direction: column; }
.sec-link {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  padding: 4px 0; font-size: 14px; font-weight: 500; color: var(--t2); text-align: left;
}
.sec-link:hover { color: var(--t1); }
.sec-link[aria-pressed="true"] { color: var(--brand-1); }
.sec-link i { font-style: normal; font-size: 12px; color: var(--t3); font-variant-numeric: tabular-nums; }
.sec-link.all { padding-bottom: 8px; margin-bottom: 4px; border-bottom: 1px solid var(--divider); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; padding-top: 6px; }
.chip {
  border: 1px solid var(--divider); background: var(--bg-elv); color: var(--t2);
  border-radius: 999px; padding: 3px 11px; font-size: 12px; font-weight: 500;
}
.chip:hover { border-color: var(--brand-3); color: var(--t1); }
.chip[aria-pressed="true"] { background: var(--brand-soft); border-color: var(--brand-1); color: var(--brand-1); }
.toggle { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--t2); padding: 4px 0; cursor: pointer; font-weight: 500; }
.toggle input { accent-color: var(--brand-1); width: 15px; height: 15px; margin: 0; }
.reset {
  display: inline-flex; margin-top: 8px; padding: 6px 14px; border: 1px solid var(--divider);
  border-radius: 20px; font-size: 13px; font-weight: 500; color: var(--t2); background: var(--bg-elv);
}
.reset:hover { border-color: var(--brand-1); color: var(--brand-1); }
.hint { font-size: 12px; color: var(--t3); line-height: 1.6; margin-top: 16px; }
.hint p { margin: 4px 0; }
.backdrop { display: none; }

.content { padding: calc(var(--nav-h) + 36px) 40px 128px calc(var(--side-w) + 40px); }
.doc { max-width: 900px; margin: 0 auto; }
.doc-head { margin-bottom: 24px; }
.doc-head h1 { font-size: 32px; line-height: 40px; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 8px; }
.doc-head p { margin: 0; color: var(--t2); font-size: 16px; }
.doc-head .stat { color: var(--t3); font-size: 14px; margin-top: 6px; }
.doc-head .stat b { color: var(--brand-1); font-weight: 600; }
.edition {
  display: inline-flex; align-items: center; gap: 8px; margin: 10px 0 14px;
  padding: 4px 10px; border-radius: 999px; background: var(--brand-soft); color: var(--brand-1);
  font-size: 12px; font-weight: 600;
}
.callout {
  border: 1px solid var(--divider); border-radius: 12px; padding: 14px 16px; margin: 14px 0;
  background: var(--bg-soft);
}
.callout h2 { margin: 0 0 6px; font-size: 14px; font-weight: 700; }
.callout p, .callout li { margin: 0 0 6px; color: var(--t2); font-size: 13px; }
.callout ul { margin: 0; padding-left: 18px; }
.callout.warn { border-color: rgba(185, 39, 44, 0.25); background: var(--red-soft); }
.sec-block { margin-top: 40px; }
.sec-h { display: flex; align-items: baseline; gap: 12px; padding-top: 24px; border-top: 1px solid var(--divider); margin-bottom: 8px; }
.sec-h h2 { font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: -0.02em; margin: 0; }
.sec-h .shown { margin-left: auto; font-size: 13px; color: var(--t3); font-variant-numeric: tabular-nums; }
.intro { margin: 0 0 20px; color: var(--t2); font-size: 14px; max-width: 72ch; }

.card {
  background: var(--bg-soft); border: 1px solid transparent; border-radius: 12px;
  padding: 22px 24px 18px; margin-bottom: 16px;
}
.card:hover { border-color: var(--divider); }
.card-h { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 10px; }
.card-h h3 { margin: 0; font-size: 18px; line-height: 28px; font-weight: 600; flex: 1; min-width: 0; overflow-wrap: anywhere; }
.card-h .idx { color: var(--t3); font-size: 14px; line-height: 28px; font-variant-numeric: tabular-nums; min-width: 22px; }
.card-h .anchor { opacity: 0; color: var(--brand-1); font-size: 16px; line-height: 28px; }
.card:hover .anchor, .anchor:focus-visible { opacity: 1; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.badge { display: inline-block; border-radius: 10px; padding: 0 10px; line-height: 20px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.badge.A { background: var(--green-soft); color: var(--green-1); }
.badge.B { background: var(--yellow-soft); color: var(--yellow-1); }
.badge.C { background: var(--gray-soft); color: var(--gray-1); }
.badge.danger { background: var(--red-soft); color: var(--red-1); }
.badge.warn { background: var(--yellow-soft); color: var(--yellow-1); }
.badge.plain { background: var(--gray-soft); color: var(--t2); font-weight: 500; }
.badge.r3 { background: var(--brand-soft); color: var(--brand-1); }
.badge.r2 { background: var(--green-soft); color: var(--green-1); }
.badge.r1 { background: var(--gray-soft); color: var(--gray-1); }
.human {
  margin: 0 0 14px; padding: 10px 14px; border-left: 2px solid var(--brand-1);
  background: var(--brand-soft); border-radius: 0 6px 6px 0; font-size: 15px; line-height: 1.75;
}
.rows { display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; font-size: 14px; line-height: 1.75; }
.rows .k { color: var(--t3); font-weight: 500; font-size: 13px; }
.rows .v { color: var(--t1); min-width: 0; overflow-wrap: anywhere; }
.rows .v.note { color: var(--t2); }
.src { margin-top: 14px; border-top: 1px solid var(--divider); padding-top: 10px; }
.src summary { list-style: none; cursor: pointer; font-size: 13px; font-weight: 500; color: var(--t2); display: flex; align-items: center; gap: 6px; }
.src summary::-webkit-details-marker { display: none; }
.src summary::before {
  content: ""; width: 6px; height: 6px; border-right: 1.5px solid var(--t3); border-bottom: 1.5px solid var(--t3);
  transform: rotate(-45deg); margin-right: 2px;
}
.src[open] summary::before { transform: rotate(45deg); }
.src .body { padding-top: 8px; font-size: 13px; line-height: 1.75; color: var(--t2); overflow-wrap: anywhere; }
.empty { border: 1px dashed var(--divider); border-radius: 12px; padding: 40px 24px; text-align: center; color: var(--t2); margin-top: 24px; }
.empty button { margin-top: 12px; padding: 7px 16px; border: 1px solid var(--divider); border-radius: 20px; font-weight: 500; background: var(--bg-elv); }
.status { color: var(--t3); padding: 40px 0; text-align: center; }
.status code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; background: var(--bg-mute); padding: 2px 6px; border-radius: 4px; }
.foot { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--divider); color: var(--t3); font-size: 13px; line-height: 1.7; }

@media (max-width: 960px) {
  :root { --nav-h: 56px; }
  .nav-in { padding: 0 12px; gap: 8px; }
  .title span { display: none; }
  .search { max-width: none; }
  .search kbd { display: none; }
  .menu-btn { display: grid; }
  .sidebar {
    transform: translateX(-110%); transition: transform .25s; z-index: 40; width: min(86vw, 320px);
  }
  .sidebar.open { transform: none; }
  .backdrop.on { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 35; }
  .content { padding: calc(var(--nav-h) + 20px) 16px 80px; }
  .doc-head h1 { font-size: 26px; line-height: 32px; }
  .seg button { padding: 5px 8px; }
}