:root {
  --c-bg: #F8F0E3;
  --c-hero-top: #FBF6EC;
  --c-hero-bottom: #F1E6D3;
  --c-panel: #FFFAF2;
  --c-panel-2: #F1E6D3;
  --c-border: #E3D5BF;
  --c-accent: #A62A73;
  --c-accent-dark: #7E1D56;
  --c-accent-soft: #E38CBE;
  --c-apricot: #F4A261;
  --c-text: #2B1F17;
  --c-muted: #6E5E50;
  --c-success: #2F7D4F;
  --c-success-soft: #7CC79A;
  --c-warn: #B7791F;
  --c-error: #C0392B;
  --c-coffee: #221915;
  --c-coffee-2: #2B201B;
  --c-coffee-3: #3A2C25;
  --c-coffee-line: #46362D;
  --c-code-key: #F4E4CA;
  --c-code-dim: #927E6D;
  --c-cream: #FFF4E4;
  --c-flag-red: #C8372D;
  --c-flag-blue: #2F3B6E;
  --c-flag-green: #2F7D4F;
  --c-flag-white: #FFFCF7;

  --a-berry-06: rgba(166,42,115,.06);
  --a-berry-10: rgba(166,42,115,.10);
  --a-berry-18: rgba(166,42,115,.18);
  --a-berry-26: rgba(166,42,115,.26);
  --a-berry-34: rgba(166,42,115,.34);
  --a-apricot-16: rgba(244,162,97,.16);
  --a-apricot-24: rgba(244,162,97,.24);
  --a-apricot-50: rgba(244,162,97,.50);
  --a-apricot-80: rgba(244,162,97,.80);
  --a-hi: rgba(255,255,255,.78);
  --a-hi-soft: rgba(255,250,242,.50);
  --a-hi-faint: rgba(255,255,255,.22);
  --a-cream-06: rgba(255,240,220,.06);
  --a-cream-10: rgba(255,240,220,.10);
  --a-ink-08: rgba(43,31,23,.08);
  --a-ink-14: rgba(43,31,23,.14);
  --a-ink-26: rgba(43,31,23,.26);
  --a-coffee-34: rgba(34,25,21,.34);
  --a-success-16: rgba(124,199,154,.16);

  --f-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-pill: 999px;
  --sh-paper: inset 0 1px 0 var(--a-hi), 0 22px 46px -14px var(--a-berry-10), 0 3px 10px var(--a-berry-06);
  --sh-float: inset 0 1px 0 var(--a-hi), 0 18px 34px -12px var(--a-berry-26), 0 3px 8px var(--a-ink-08);
  --gutter: 24px;
  --grain-opacity: .03;
  --toc-offset: 112px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
html.nav-open { overflow: hidden; }
body { margin: 0; background: var(--c-bg); color: var(--c-text); font: 16px/1.6 var(--f-body); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, [role="tab"]:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; border-radius: var(--r-sm); }
img, svg { max-width: 100%; }
img { display: block; }
svg { flex-shrink: 0; }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.18; text-wrap: balance; }
h1 { font-size: clamp(52px,5vw,72px); font-weight: 800; letter-spacing: -.03em; }
h2 { font-size: clamp(30px,3.2vw,44px); letter-spacing: -.02em; }
h3 { font-size: clamp(22px,2.2vw,28px); }
p { margin: 0 0 1em; }
code, pre { font-family: var(--f-mono); }
:not(pre) > code { overflow-wrap: anywhere; }
pre { max-width: 100%; overflow-x: auto; }
.wrap { width: 100%; max-width: 1248px; margin-inline: auto; padding-inline: var(--gutter); min-width: 0; }
.wrap > *, .grid > *, .panel > * { min-width: 0; }
.sec { padding-top: 88px; padding-bottom: 88px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.no-break { white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; padding: 8px 14px; border-radius: var(--r-sm); background: var(--c-coffee); color: var(--c-cream); }
.skip:focus { top: 12px; }
.reveal { transition: opacity .6s ease, transform .6s ease; }
.reveal.pending { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; }
.panel, .paper-card { background: var(--c-panel); border: 1px solid var(--c-border); border-radius: var(--r-lg); box-shadow: var(--sh-paper); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 9px 20px; border: 1px solid transparent; border-radius: var(--r-sm); font-weight: 700; white-space: nowrap; flex-shrink: 0; transition: transform .2s ease, background-color .2s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(180deg,var(--c-accent),var(--c-accent-dark)); color: var(--c-panel); box-shadow: inset 0 1px 0 var(--a-hi-faint), 0 8px 18px -8px var(--a-berry-34); }
.btn-secondary { background: var(--c-coffee); color: var(--c-cream); }
.btn-outline { background: var(--c-panel); color: var(--c-text); border-color: var(--c-text); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.badge { display: inline-flex; align-items: center; gap: 8px; max-width: 100%; min-height: 28px; padding: 3px 12px; border: 1px solid var(--c-border); border-radius: var(--r-pill); background: var(--c-panel); color: var(--c-text); font-size: 13px; font-weight: 600; overflow: hidden; box-shadow: inset 0 1px 0 var(--a-hi); }
.badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--c-accent); box-shadow: 0 0 0 3px var(--a-berry-18); flex: none; }
.fact-number { display: inline-block; min-width: 3ch; font-variant-numeric: tabular-nums; font-family: var(--f-mono); }

/* Shared navigation */
.site-head { position: relative; z-index: 70; background: var(--c-hero-top); }
.nav { max-width: 1392px; height: 64px; margin: auto; padding-inline: 32px; display: flex; align-items: center; gap: 44px; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex: none; }
.brand__mark { width: 30px; height: 30px; flex: none; }
.brand__en { font: 800 20px/1 var(--f-display); letter-spacing: -.03em; }
.brand__zh { padding-left: 10px; border-left: 1px solid var(--c-border); font-size: 13.5px; color: var(--c-muted); }
.nav__links { display: flex; align-items: center; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav__links a { display: block; padding: 6px 0; color: var(--c-muted); font-size: 14.5px; font-weight: 500; white-space: nowrap; }
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--c-text); }
.nav__links a[aria-current="page"] { font-weight: 700; }
.nav__end { margin-left: auto; display: flex; align-items: center; gap: 14px; flex: none; }
.lang-control { position: relative; }
.lang-button { display: inline-flex; align-items: center; justify-content: center; gap: 5px; width: auto; min-width: 44px; min-height: 44px; padding: 6px; border: 0; background: transparent; color: var(--c-muted); font-size: 14px; }
.lang-button span { white-space: nowrap; }
.lang-button svg { width: 16px; height: 16px; }
.lang-menu { position: absolute; right: 0; top: 100%; z-index: 90; min-width: 160px; margin: 0; padding: 6px; list-style: none; border: 1px solid var(--c-border); border-radius: var(--r-md); background: var(--c-panel); box-shadow: var(--sh-float); }
.lang-menu[hidden] { display: none; }
.lang-menu a { display: flex; align-items: center; min-height: 40px; padding: 7px 12px; border-radius: var(--r-sm); }
.lang-menu a:hover, .lang-menu a[aria-current] { background: var(--c-panel-2); }
.login { display: inline-flex; align-items: center; justify-content: center; min-height: 36px; padding: 0 16px; border: 1.5px solid var(--c-text); border-radius: var(--r-sm); background: var(--c-panel); box-shadow: inset 0 1px 0 var(--a-hi); font-size: 14px; font-weight: 700; white-space: nowrap; }
.login:hover { background: var(--c-text); color: var(--c-panel); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid var(--c-border); border-radius: var(--r-sm); background: var(--c-panel); color: var(--c-text); }
.menu-toggle svg { width: 20px; height: 20px; }
.mobile-nav { display: none; }
.mobile-nav a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 16px; border-radius: var(--r-sm); color: var(--c-muted); font-weight: 600; }
.mobile-nav a[aria-current], .mobile-nav a:hover { background: var(--c-panel-2); color: var(--c-text); }
.mobile-nav__label { margin: 12px 16px 2px; font-size: 12px; color: var(--c-muted); }
.mobile-veil { display: none; }
.site-foot { background: var(--c-coffee); color: var(--c-cream); }
.foot-grid { display: grid; grid-template-columns: 1.3fr 1fr 1.2fr; gap: 48px; padding-top: 64px; padding-bottom: 44px; }
.foot-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 22px; }
.foot-brand img { width: 30px; height: 30px; }
.foot-desc { max-width: 330px; margin-top: 18px; color: var(--c-code-key); }
.foot-heading { margin: 0 0 14px; font-size: 14px; font-weight: 700; color: var(--c-apricot); }
.foot-list { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0; padding: 0; list-style: none; }
.foot-list a { display: inline-flex; align-items: center; min-height: 30px; font-size: 14px; color: var(--c-code-key); }
.foot-list a:hover { color: var(--c-cream); text-decoration: underline; }
.foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; padding-top: 20px; padding-bottom: 28px; border-top: 1px solid var(--c-coffee-line); font-size: 13px; color: var(--c-code-key); }
.foot-languages { display: flex; flex-wrap: wrap; gap: 14px; }
.foot-languages a { min-height: 28px; display: inline-flex; align-items: center; }

/* Status component remains in normal flow around its grid. */
#server-status { display: block; max-width: 100%; overflow: hidden; margin-bottom: 24px; }
#server-status + * { margin-top: 24px; }
.prose { max-width: 76ch; overflow-wrap: break-word; }
.prose img { max-width: 100%; height: auto; }
.prose section { padding-top: 24px; padding-bottom: 24px; }
.prose pre { padding: 16px; border-radius: var(--r-md); background: var(--c-coffee); color: var(--c-cream); }
body:has(.toc-tabs) section[id] { scroll-margin-top: var(--toc-offset); }

@media (max-width: 1300px) {
  .nav { gap: 30px; }
  .nav__links { gap: 18px; }
  .nav__links a { font-size: 13px; }
}
@media (max-width: 1180px) {
  .nav__links { display: none; }
  .nav__end { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-nav { position: absolute; top: 64px; left: 0; right: 0; z-index: 80; display: block; max-height: calc(100dvh - 64px); overflow-y: auto; overscroll-behavior: contain; padding: 12px var(--gutter) 22px; background: var(--c-panel); border-top: 1px solid var(--c-border); box-shadow: var(--sh-float); }
  .mobile-nav[hidden] { display: none; }
  .mobile-nav .foot-list { display: block; }
  .mobile-nav .foot-list li { width: 100%; }
  .mobile-nav .foot-list a { display: flex; width: 100%; min-height: 44px; padding: 10px 16px; }
  .mobile-veil.is-open { position: fixed; inset: 64px 0 0; z-index: 65; display: block; background: var(--a-coffee-34); }
}
@media (max-width: 768px) {
  h1 { font-size: clamp(28px,8vw,40px); line-height: 1.12; letter-spacing: -.02em; }
  .sec { padding-top: 64px; padding-bottom: 64px; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .no-break { white-space: normal; }
  .nav { padding-inline: var(--gutter); gap: 8px; }
  .nav__end { gap: 5px; margin-left: auto; }
  .lang-button { padding-inline: 4px; }
  .foot-grid { grid-template-columns: 1fr; }
  .tilt, [class*="tilt-"] { transform: none; }
  .decorative-halo, .stripe-halo { max-width: 100%; }
}
@media (max-width: 370px) {
  .brand__en { font-size: 18px; }
  .lang-button { font-size: 12px; }
  .login { padding-inline: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal.pending { opacity: 1; transform: none; transition: none; }
  .btn, .login { transition: none; }
}