:root{
  --bg:#F9F3E6;--bg-panel:#FFFCF6;--bg-panel-2:#F0E7D6;
  --border:#E3D7C2;--border-strong:#D3C4AA;--pane-edge:#EFE5D3;--chrome-bg:#F7F0E2;
  --accent:#136B5C;--accent-dark:#0C4A40;--accent-soft:#E1EEE7;
  --text:#2A2119;--text-muted:#6E6152;--text-faint:#9A8C7A;
  --success:#2E8A57;--warn:#C08A1E;--error:#B8432F;--on-accent:#FFFFFF;
  --hero-top:#FCF8EF;--hero-bottom:#F2EADA;
  --tint-08:rgba(19,107,92,.08);--tint-12:rgba(19,107,92,.12);--tint-22:rgba(19,107,92,.22);
  --ink-shadow:rgba(42,33,25,.07);--veil:rgba(42,33,25,.3);
  --hi-line:rgba(255,255,255,.92);--hi-soft:rgba(255,255,255,.2);
  --glass:rgba(255,255,255,.4);--glass-edge:rgba(255,255,255,.62);
  --sheen:rgba(255,255,255,.14);--sheen-light:rgba(255,255,255,.32);
  --grid-on-dark:rgba(255,255,255,.06);--grid-on-light:rgba(42,33,25,.04);
  --candy-pine-a:#1F7D6B;--candy-pine-b:#0C4A40;--candy-lav-a:#DCD5F6;--candy-lav-b:#B5AAE9;
  --candy-lime-a:#EDF4BC;--candy-lime-b:#CADC72;--candy-mint-a:#D8F0E6;--candy-mint-b:#A6D6C3;
  --flag-red:#C8372D;--flag-white:#FFFDF8;--flag-blue:#24427C;--flag-green:#2C8550;
  --grain-ink:#6E6152;--grain-opacity:.03;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:6px;--r-sm:8px;--r-md:12px;--r-lg:20px;--r-glass:18px;--r-face:19px;--r-switch:10px;--r-tool:14px;--r-device:7px;--r-pill:999px;--r-circle:50%;
  --shell:1280px;--gutter:32px;--header-height:64px;--anchor-offset:80px;--toc-offset:132px;
  --text-base:16px;--text-small:14px;--text-lede:20px;--text-h1:66px;--text-h2:36px;--text-h3:22px;
  --weight-body:400;--weight-medium:500;--weight-bold:700;--weight-display:800;
  --shadow-panel:inset 0 1px 0 var(--hi-line),0 22px 44px -18px var(--tint-12);
  --shadow-deep:inset 0 1px 0 var(--hi-line),0 30px 54px -30px var(--tint-22),0 2px 6px var(--ink-shadow);
  --ease: .18s;--reveal-time:.35s;--section-gap:80px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.5;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:50;pointer-events:none;opacity:var(--grain-opacity);background-color:var(--grain-ink);filter:url("#paper-grain");mix-blend-mode:multiply}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,summary,a{-webkit-tap-highlight-color:var(--tint-12)}
button{border:0}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
p,ul,ol,blockquote{margin:0}
ul{padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--text-h1);line-height:1.1;letter-spacing:-.02em;margin:0}
h2{font-size:var(--text-h2);line-height:1.2;letter-spacing:-.02em;margin:0 0 20px}
h3{font-size:var(--text-h3);line-height:1.3;margin:0 0 12px}
h4{margin:0 0 12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
.shell,.wrap{width:100%;max-width:calc(var(--shell) + var(--gutter)*2);padding-inline:var(--gutter);margin-inline:auto}
.sec{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.section-head{max-width:800px;margin-bottom:32px}
.section-head p,.muted{color:var(--text-muted)}
.no-break{white-space:nowrap}
.accent,.h1-accent{color:var(--accent);font-style:normal}
.mono{font-family:var(--font-mono)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.panel{padding:28px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.panel-sunk{background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-md);padding:20px}
.decorated{position:relative;overflow-x:clip}
.skip{position:absolute;left:16px;top:-60px;z-index:100;padding:10px 16px;border-radius:var(--r-sm);background:var(--accent-dark);color:var(--on-accent);text-decoration:none;font-weight:var(--weight-bold)}
.skip:focus{top:12px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 20px;border-radius:var(--r-sm);font-family:var(--font-body);font-size:16px;font-weight:var(--weight-bold);text-decoration:none;transition:background-color var(--ease),box-shadow var(--ease);flex-shrink:0;white-space:nowrap;border:1px solid transparent}
.btn svg{width:19px;height:19px}
.btn-primary{padding:0 22px 0 12px;background:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi-soft),0 14px 28px -14px var(--tint-22)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-ghost,.btn-secondary{padding:0 20px 0 16px;background:var(--bg-panel);color:var(--text);border:1.5px solid var(--text)}
.btn-ghost:hover,.btn-secondary:hover,.btn-ghost.is-hover{background:var(--bg-panel-2)}
.btn:active,.btn.is-active{box-shadow:inset 0 2px 4px var(--tint-22)}
.btn:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border-strong);box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-text{background:transparent;color:var(--accent);padding-inline:8px}
.bolt-chip{display:grid;place-items:center;width:26px;height:26px;border-radius:var(--r-circle);background:var(--on-accent);color:var(--accent)}
.bolt-chip svg{width:14px;height:14px}
.cta-row{margin-top:22px;display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.topbar{position:relative;z-index:80;background:var(--hero-top);border-bottom:1px solid var(--border)}
.topbar-row{height:var(--header-height);display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;letter-spacing:-.02em;flex-shrink:0}
.brand img{width:32px;height:32px;flex:none}
.brand-zh{color:var(--text-muted);font-weight:var(--weight-medium)}
.desktop-nav{flex:1;min-width:0}
.nav-main{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-main>li{position:relative}
.nav-main a,.nav-more summary{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 12px;border-radius:var(--r-sm);font-size:15px;font-weight:var(--weight-medium);text-decoration:none;cursor:pointer;white-space:nowrap;transition:background-color var(--ease)}
.nav-main a:hover,.nav-more summary:hover{background:var(--bg-panel-2)}
.nav-main a[aria-current="page"],.nav-more summary[data-current]{color:var(--accent);font-weight:var(--weight-bold)}
.nav-main a[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;border-radius:var(--r-pill);background:var(--accent)}
.nav-more summary{list-style:none}
.nav-more summary::-webkit-details-marker{display:none}
.caret{font-size:11px;color:var(--text-muted)}
.more-panel{position:absolute;top:calc(100% + 8px);left:0;z-index:85;min-width:236px;padding:10px;border-radius:var(--r-md);background:var(--bg-panel);border:1px solid var(--border);box-shadow:var(--shadow-panel);display:grid;gap:10px}
.more-group h4{margin:2px 10px 4px;font-size:12px;font-weight:600;color:var(--text-muted)}
.more-group a{display:flex;min-height:36px;width:100%;padding:0 10px;font-size:14.5px}
.nav-end{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-picker{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 12px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted);background:transparent;border:1px solid transparent}
.lang-button span{white-space:nowrap}
.lang-button svg{width:16px;height:16px}
.lang-button:hover{border-color:var(--border);background:var(--bg-panel)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:95;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--accent-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:38px;padding:0 18px;border-radius:var(--r-sm);background:var(--accent);color:var(--on-accent);font-size:14.5px;font-weight:var(--weight-bold);text-decoration:none;box-shadow:inset 0 1px 0 var(--hi-soft),0 8px 18px -10px var(--tint-22);white-space:nowrap}
.login:hover{background:var(--accent-dark)}
.login svg{width:15px;height:15px}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;z-index:75;width:min(360px,100%);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px;background:var(--bg-panel);border-left:1px solid var(--border);box-shadow:var(--shadow-panel)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{color:var(--accent);background:var(--accent-soft)}
.drawer-heading{padding:16px;font-size:13px;color:var(--text-muted);border-top:1px solid var(--border);margin-top:12px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:70;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:52px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.2fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:18px;max-width:350px;color:var(--text-muted);font-size:14px;line-height:1.8}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 18px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;padding-block:3px;text-decoration:none;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:32px}
.footer-bottom{border-top:1px solid var(--border-strong);margin-top:24px;padding-top:20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;gap:16px;flex-wrap:wrap}
.prose{max-width:820px;line-height:1.85;overflow-wrap:break-word}
.prose>*+*{margin-top:20px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose ul{padding-left:24px;list-style:disc}
.prose ol{padding-left:24px}
.prose li+li{margin-top:8px}
code{font-family:var(--font-mono);overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--bg-panel-2);padding:20px;border-radius:var(--r-md)}
pre code{white-space:pre;overflow-wrap:normal;padding:0}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
@media(min-width:901px){.mobile-drawer,.nav-veil{display:none}}
@media(max-width:1180px){:root{--text-h1:56px}.topbar-row{gap:12px}.nav-main a,.nav-more summary{padding-inline:10px}}
@media(max-width:1000px){.nav-main a,.nav-more summary{font-size:14px;padding-inline:8px}.lang-button{padding-inline:8px}}
@media(max-width:900px){.desktop-nav{display:none}.menu-toggle{display:flex}.nav-end{margin-left:auto;gap:8px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:768px){:root{--gutter:16px;--text-h1:40px;--text-h2:28px;--text-h3:20px;--section-gap:48px}.grid{grid-template-columns:1fr}.panel{padding:22px}.decorated{max-width:100%}.topbar-row{gap:8px}.lang-button{font-size:12px;padding-inline:6px}}
@media(max-width:640px){:root{--text-h1:34px}.no-break{white-space:normal}.tilt{transform:none}.footer-grid{grid-template-columns:1fr;gap:28px}.footer-brand{grid-column:auto}.brand{font-size:18px;gap:7px}.brand img{width:28px;height:28px}.login{padding-inline:12px}.lang-button svg{display:none}.topbar-row{gap:4px}.nav-end{gap:4px}.cta-row{gap:10px}.btn{max-width:100%}.footer-bottom{align-items:flex-start}}
@media(max-width:359px){.brand{font-size:16px}.lang-button{font-size:11px;padding-inline:4px}.login{padding-inline:10px}.topbar-row{gap:2px}.nav-end{gap:2px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:0s!important}.reveal,.reveal.pending{opacity:1;transform:none}}