:root {
  --bg: #F7F2E8;
  --bg-top: #FAF6EE;
  --bg-bottom: #F1E9DB;
  --panel: #FFFCF6;
  --panel-2: #EFE7D8;
  --panel-3: #F6F0E5;
  --border: #E2D8C6;
  --border-soft: #EAE1D1;
  --accent: #3A7A6F;
  --accent-dark: #275A51;
  --accent-deep: #1F4A43;
  --seaglass: #9CC3B7;
  --sand: #E8DCC2;
  --sand-card: #E9DFCB;
  --cocoa: #3A2A22;
  --accent-wash: #D6E8E2;
  --accent-a18: rgba(58,122,111,.18);
  --deep-a35: rgba(31,74,67,.35);
  --text: #2A2119;
  --muted: #6E6255;
  --muted-2: #9E907E;
  --on-accent: #FFFCF6;
  --success: #3E8A4F;
  --warn: #B7791F;
  --error: #B4432F;
  --shadow-tint: rgba(58,122,111,.12);
  --shadow-ink: rgba(42,33,25,.08);
  --shadow-deep: rgba(31,74,67,.22);
  --edge: rgba(42,33,25,.14);
  --hi: rgba(255,255,255,.82);
  --hi-soft: rgba(255,255,255,.2);
  --veil: rgba(42,33,25,.35);
  --clear: transparent;
  --flag-red: #C8323A;
  --flag-white: #FFFDF8;
  --flag-blue: #253F7E;
  --flag-navy: #1E2F6B;
  --font-display: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-body: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-mono: "JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs: 4px;
  --r-icon: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;
  --r-round: 50%;
  --wrap: 1280px;
  --gutter: 32px;
  --header-height: 64px;
  --anchor-offset: 80px;
  --toc-offset: 88px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-9: 72px;
  --space-12: 96px;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --type-body: 16px;
  --type-h1: clamp(52px,4.6vw,66px);
  --type-h2: clamp(28px,3vw,40px);
  --type-h3: 24px;
  --leading-body: 1.6;
  --leading-title: 1.12;
  --tracking-title: -.01em;
  --ease: cubic-bezier(.2,.7,.2,1);
  --grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .16 0 0 0 0 .13 0 0 0 0 .1 0 0 0 .03 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: var(--anchor-offset); scroll-behavior: smooth; }
html, body { margin: 0; }
body {
  background: var(--grain),var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--type-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
svg { flex-shrink: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-underline-offset: 4px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
h1, h2, h3 { font-family: var(--font-display); font-weight: var(--weight-regular); letter-spacing: var(--tracking-title); text-wrap: balance; overflow-wrap: break-word; }
h1 { margin: 0 0 var(--space-4); font-size: var(--type-h1); line-height: var(--leading-title); }
h2 { margin: 0 0 var(--space-3); font-size: var(--type-h2); line-height: 1.25; }
h3 { margin: 0 0 var(--space-2); font-size: var(--type-h3); line-height: 1.35; }
p { margin: 0 0 var(--space-3); }
strong { font-weight: var(--weight-medium); }
code { font-family: var(--font-mono); overflow-wrap: anywhere; }
pre { max-width: 100%; overflow-x: auto; padding: var(--space-3); background: var(--panel-2); border-radius: var(--r-sm); }
pre code { white-space: pre; overflow-wrap: normal; }
.wrap { width: 100%; max-width: calc(var(--wrap) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-top: var(--space-9); padding-bottom: var(--space-9); }
.reading { max-width: 860px; }
.prose { min-width: 0; overflow-wrap: break-word; }
.prose h2, .prose h3 { margin-top: var(--space-6); }
.prose li { margin-bottom: var(--space-1); }
.no-break { white-space: nowrap; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.grid { display: grid; gap: var(--space-3); }
.grid > *, .hero__grid > *, .footer__grid > * { min-width: 0; }
.grid--three { grid-template-columns: repeat(3,minmax(0,1fr)); }
.grid--two { grid-template-columns: repeat(2,minmax(0,1fr)); }
.panel, .card {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--space-4);
  box-shadow: inset 0 1px 0 var(--hi),0 16px 40px var(--shadow-tint);
}
.decoration-zone { position: relative; overflow-x: clip; max-width: 100%; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 48px; padding: 0 26px; border: 1px solid var(--clear);
  border-radius: var(--r-sm); font-family: var(--font-body); font-size: 16px;
  font-weight: var(--weight-medium); text-decoration: none;
  white-space: nowrap; flex-shrink: 0; transition: transform .2s ease,background-color .2s ease;
}
.btn--primary, .btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: inset 0 1px 0 var(--hi-soft),0 10px 24px var(--shadow-tint); }
.btn--primary:hover, .btn-primary:hover, .btn.is-hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn--secondary { background: var(--panel); border-color: var(--border); color: var(--text); }
.btn--secondary:hover { border-color: var(--accent); }
.btn--link { padding: 0 2px; color: var(--text); font-weight: var(--weight-regular); }
.btn--link span { text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 6px; }
.btn--link svg { width: 14px; height: 14px; color: var(--accent); transition: transform .2s ease; }
.btn--link:hover svg { transform: translateX(3px); }
.btn:active, .btn.is-pressed { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--panel-2); color: var(--muted); box-shadow: none; cursor: not-allowed; transform: none; }
.topbar { position: relative; z-index: 30; background: var(--bg-top); border-bottom: 1px solid var(--border-soft); }
.topbar__in { display: flex; align-items: center; height: var(--header-height); position: relative; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); flex-shrink: 0; min-height: 30px; }
.brand__mark { display: block; width: 30px; height: 30px; flex-shrink: 0; }
.brand__name { font-size: 18px; font-weight: var(--weight-semibold); letter-spacing: .06em; }
.mainnav { margin-left: 48px; }
.mainnav__list { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.mainnav__list > li { position: relative; }
.navlink, .mainnav summary {
  display: flex; align-items: center; gap: 4px; height: 40px; padding: 0 14px;
  font-size: 15px; color: var(--muted); text-decoration: none; border-radius: var(--r-sm); cursor: pointer;
}
.navlink:hover, .mainnav summary:hover { color: var(--text); background: var(--panel-2); }
.navlink.is-current, .mainnav summary.is-current { color: var(--text); }
.navlink.is-current::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px; height: 2px; border-radius: var(--r-xs); background: var(--accent); }
summary { list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
.chev { width: 12px; height: 12px; flex-shrink: 0; }
.dropmenu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 176px;
  list-style: none; margin: 0; padding: 6px; background: var(--panel);
  border: 1px solid var(--border); border-radius: var(--r-md);
  box-shadow: 0 16px 40px var(--shadow-tint),0 2px 6px var(--shadow-ink);
}
.dropmenu a { display: flex; align-items: center; min-height: 36px; padding: 6px 12px; font-size: 14px; color: var(--text); text-decoration: none; border-radius: var(--r-sm); }
.dropmenu a:hover, .dropmenu a[aria-current] { background: var(--panel-2); }
.topbar__end { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.lang { position: relative; }
.lang summary { display: flex; align-items: center; gap: 6px; min-height: 38px; padding: 0 12px; font-size: 14px; color: var(--muted); border-radius: var(--r-sm); cursor: pointer; width: auto; }
.lang summary span { white-space: nowrap; }
.lang summary:hover { background: var(--panel-2); color: var(--text); }
.lang .dropmenu { left: auto; right: 0; min-width: 148px; }
.btn-login { display: inline-flex; align-items: center; justify-content: center; height: 38px; padding: 0 20px; font-size: 15px; text-decoration: none; white-space: nowrap; color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-sm); box-shadow: inset 0 1px 0 var(--hi),0 1px 2px var(--shadow-ink); transition: transform .2s ease; }
.btn-login:hover { border-color: var(--accent); transform: translateY(-1px); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid var(--border); border-radius: var(--r-sm); background: var(--panel); }
.menu-toggle svg { width: 20px; height: 20px; }
.mobile-drawer { display: none; }
.nav-veil { display: none; }
.footer { background: var(--panel-2); border-top: 1px solid var(--border); padding-top: var(--space-8); padding-bottom: var(--space-4); }
.footer__grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: var(--space-6); }
.footer__intro { margin-top: var(--space-3); max-width: 26em; color: var(--muted); }
.footer__heading { margin: 0 0 var(--space-2); font-size: 16px; font-weight: var(--weight-medium); }
.footer__links { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 4px 16px; list-style: none; margin: 0; padding: 0; }
.footer__links a, .footer__languages a, .footer__legal a { display: inline-flex; align-items: center; min-height: 32px; font-size: 14px; color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--accent-dark); text-decoration: underline; }
.footer__bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-6); padding-top: var(--space-3); border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.footer__languages, .footer__legal { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.footer__copyright { margin: 0; }
.reveal { transition: opacity .6s ease,transform .6s var(--ease); }
.reveal.pending { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; }
#server-status { position: static; display: block; min-width: 0; max-width: 100%; overflow: hidden; margin-top: var(--space-3); margin-bottom: var(--space-4); }
#server-status + * { margin-top: var(--space-4); }
#server-status > * { min-width: 0; max-width: 100%; }
body:has(.toc-tabs) section[id] { scroll-margin-top: var(--toc-offset); }
.ico-line { fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.svg-library { position: absolute; width: 0; height: 0; overflow: hidden; }
@media (max-width:1080px) {
  .mainnav { margin-left: 24px; }
  .navlink, .mainnav summary { padding-inline: 10px; }
  .grid--three { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width:768px) {
  :root { --type-h1: 40px; --gutter: 24px; }
  .mainnav { display: none; }
  .topbar__end { margin-left: auto; gap: 8px; }
  .lang summary { min-width: 44px; min-height: 44px; padding-inline: 8px; }
  .lang summary > span { display: none; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer {
    position: absolute; top: 100%; left: var(--gutter); right: var(--gutter); z-index: 32;
    background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-md);
    max-height: calc(100dvh - var(--header-height) - 16px); overflow-y: auto; overscroll-behavior: contain; padding: 12px;
    box-shadow: 0 16px 40px var(--shadow-tint);
  }
  .mobile-drawer.is-open { display: block; }
  .mobile-drawer ul { list-style: none; margin: 0; padding: 0; }
  .mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 14px; text-decoration: none; border-radius: var(--r-sm); }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--panel-2); color: var(--accent-dark); }
  .mobile-drawer__label { padding: 12px 14px 4px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--border); }
  .nav-veil.is-open { display: block; position: fixed; inset: var(--header-height) 0 0; z-index: 20; border: 0; background: var(--veil); }
  .footer__grid { grid-template-columns: 1fr; gap: var(--space-4); }
}
@media (max-width:640px) {
  :root { --gutter: 16px; --type-h1: clamp(28px,8vw,40px); }
  .no-break { white-space: normal; }
  .tilt { transform: none !important; }
  .decoration-zone { max-width: 100%; }
  .grid--three, .grid--two { grid-template-columns: minmax(0,1fr); }
  .section { padding-top: var(--space-6); padding-bottom: var(--space-6); }
  .panel, .card { padding: var(--space-3); }
  .brand__name { font-size: 16px; }
  .topbar__end { gap: 4px; margin-left: auto; }
  .btn-login { padding-inline: 12px; }
  .footer__bottom { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal, .reveal.pending { opacity: 1; transform: none; }
}