:root{
  --bg:#E7ECF4;
  --bg-panel:#F5F7FB;
  --bg-panel-2:#D9E0EC;
  --border:#C3CCDB;
  --accent:#4C7A45;
  --accent-dark:#345A30;
  --accent-soft:#86AD78;
  --text:#161C2B;
  --text-muted:#545E73;
  --success:#2F8A57;
  --warn:#B07A1A;
  --error:#B2413A;
  --ink:#161C2B;
  --ink-raise:#2A3350;
  --on-ink:#F5F7FB;
  --stage-a:#1C2340;
  --stage-b:#252E52;
  --stage-text:#ECE6D6;
  --stage-muted:#A3AEC8;
  --stage-line:#7483A4;
  --on-tile:#F6F1E4;
  --tile-ochre-a:#B58D50;
  --tile-ochre-b:#987240;
  --tile-moss-a:#6F9363;
  --tile-moss-b:#557A4B;
  --tile-slate-a:#768AAC;
  --tile-slate-b:#5B6E92;
  --tile-rust-a:#AA6351;
  --tile-rust-b:#8C4B3E;
  --tile-paper-a:#EEE7D5;
  --tile-paper-b:#DAD0B8;
  --tile-mist-a:#D0D9E8;
  --tile-mist-b:#B3C0D7;
  --tile-ink-muted:#4A4636;
  --flag-red:#BE3E43;
  --flag-white:#F7F5EF;
  --flag-blue:#2E3F74;
  --flag-green:#2F7A4E;
  --flag-edge:rgba(22,28,43,.14);
  --line-soft:rgba(195,204,219,.72);
  --plate:rgba(22,28,43,.62);
  --sheen-hi:rgba(255,255,255,.22);
  --sheen-lo:rgba(10,14,30,.18);
  --stage-sheen:rgba(255,255,255,.05);
  --glow:rgba(134,173,120,.20);
  --glow-strong:rgba(134,173,120,.38);
  --ring:rgba(236,230,214,.18);
  --accent-ring:rgba(76,122,69,.18);
  --btn-hl:rgba(255,255,255,.12);
  --strip-hl:rgba(255,255,255,.9);
  --shade-xs:rgba(22,28,43,.06);
  --hero-top:rgba(245,247,251,.55);
  --hero-mid:rgba(76,122,69,.04);
  --hero-low:rgba(70,96,140,.07);
  --veil:rgba(22,28,43,.36);
  --shadow-stage:0 48px 90px -30px rgba(76,122,69,.14),0 22px 44px -18px rgba(76,122,69,.10),0 2px 6px rgba(22,28,43,.10);
  --hl-stage:inset 0 1px 0 rgba(255,255,255,.16),inset 0 0 0 1px rgba(255,255,255,.05);
  --shadow-tile:0 10px 18px -6px rgba(6,9,22,.55),0 2px 4px rgba(6,9,22,.35);
  --shadow-float:0 18px 36px -14px rgba(76,122,69,.26),0 3px 8px rgba(22,28,43,.08);
  --shadow-btn:0 12px 24px -12px rgba(22,28,43,.5);
  --shadow-float-cta:0 16px 32px -12px rgba(52,90,48,.45),0 2px 6px rgba(22,28,43,.12);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --font-serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong",Georgia,serif;
  --r-0:0;
  --r-xs:2px;
  --r-sm:6px;
  --r-card:8px;
  --r-stage:12px;
  --r-pill:999px;
  --wrap:1440px;
  --gutter:80px;
  --reading:780px;
  --header-height:72px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --section-gap:80px;
  --text-base:16px;
  --text-small:14px;
  --text-label:11.5px;
  --h1-size:clamp(52px,4.45vw,64px);
  --h2-size:36px;
  --h3-size:24px;
  --focus-width:2px;
  --ease-time:.2s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{color:inherit;cursor:pointer}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
ul{list-style:none;margin:0;padding:0}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:var(--focus-width) solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
:where(.wrap,.reading-wrap,.grid,.hero-grid,.footer-grid)>*{min-width:0}
.section{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1,.h1{font-size:var(--h1-size);font-weight:800;line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--h2-size);line-height:1.25;letter-spacing:-.015em}
h3{font-size:var(--h3-size);line-height:1.35}
p{margin:0 0 1.25em}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.serif{font-family:var(--font-serif)}
.mono{font-family:var(--font-mono)}
.kicker{font-family:var(--font-mono);font-size:var(--text-label);letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted)}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.6em}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:.2em}
.prose ul{list-style:disc;padding-left:1.4em;margin-bottom:1.4em}
.prose ol{padding-left:1.5em;margin-bottom:1.4em}
.prose li+li{margin-top:.5em}
code{font-family:var(--font-mono);overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--r-xs);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;background:var(--ink);color:var(--on-ink);padding:24px;border-radius:var(--r-card);line-height:1.7}
pre code{padding:0;background:transparent;color:inherit;white-space:pre;overflow-wrap:normal}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.panel,.card{background:var(--bg-panel);border-radius:var(--r-card);padding:28px}
.panel-sunk{background:var(--bg-panel-2)}
.divider{border:0;border-top:1px solid var(--border);margin:24px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border:0;border-radius:var(--r-pill);font-size:16px;font-weight:600;line-height:1;white-space:nowrap;flex-shrink:0;transition:background var(--ease-time),box-shadow var(--ease-time)}
.btn svg{width:18px;height:18px;transition:transform var(--ease-time)}
.btn-primary{background:linear-gradient(180deg,var(--ink-raise),var(--ink));color:var(--on-ink);box-shadow:var(--shadow-btn),inset 0 1px 0 var(--btn-hl);padding-right:22px}
.btn-primary:hover{background:var(--ink-raise)}
.btn-primary:hover svg{transform:translateX(3px)}
.btn-ghost,.btn-secondary{border:1.5px solid var(--text);color:var(--text);background:transparent}
.btn-ghost:hover,.btn-secondary:hover{background:var(--bg-panel)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);box-shadow:none;cursor:not-allowed}
.btn-small{min-height:44px;font-size:var(--text-small);padding-inline:20px}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:32px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:.2em}
.ico-line{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.site-header{position:relative;z-index:60;background:var(--hero-top);border-bottom:1px solid var(--line-soft)}
.site-header .wrap{display:flex;align-items:center;gap:32px;min-height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand-logo{width:32px;height:32px}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.01em;line-height:1}
.brand-zh{font-family:var(--font-serif);font-size:15px;font-weight:400;color:var(--text-muted);padding-left:10px;border-left:1px solid var(--border);line-height:1}
.nav{margin-left:auto}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav-list li{display:flex;align-items:center}
.nav-list li+li::before{content:"·";color:var(--text-muted);opacity:.55;margin:0 11px;font-weight:700}
.nav-list a{position:relative;font-size:14.5px;color:var(--text-muted);padding:6px 0;min-height:32px;white-space:nowrap;transition:color var(--ease-time)}
.nav-list a:hover{color:var(--text)}
.nav-list a[aria-current="page"]{color:var(--text);font-weight:600}
.nav-list a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:var(--r-xs);background:var(--accent)}
.header-tools{display:flex;align-items:center;gap:16px;flex:none}
.lang-box{position:relative}
.lang{appearance:none;border:0;background:transparent;font:inherit;font-size:14px;color:var(--text-muted);display:inline-flex;align-items:center;justify-content:center;gap:6px;cursor:pointer;padding:6px 2px;min-width:44px;min-height:44px;width:auto}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:180px;background:var(--bg-panel);border-radius:var(--r-card);box-shadow:var(--shadow-float);padding:8px;z-index:5}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 18px;border-radius:var(--r-card);background:var(--ink);color:var(--on-ink);font-size:14px;font-weight:600;box-shadow:var(--shadow-btn);transition:background var(--ease-time)}
.btn-login:hover{background:var(--ink-raise)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:0;background:var(--bg-panel);border-radius:var(--r-sm)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{display:none;position:absolute;left:0;right:0;top:100%;background:var(--bg-panel);z-index:4;padding:16px var(--gutter);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow-float)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{color:var(--accent-dark);font-weight:700}
.drawer-label{margin:20px 16px 8px;font-family:var(--font-mono);font-size:var(--text-label);color:var(--text-muted)}
.nav-veil{position:fixed;inset:0;z-index:50;background:var(--veil);border:0}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-intro p{color:var(--text-muted);font-family:var(--font-serif);margin-top:20px;max-width:28em}
.footer-title{font-family:var(--font-mono);font-size:var(--text-label);letter-spacing:.14em;margin:0 0 16px;color:var(--text-muted)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-small)}
.footer-links a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border)}
.footer-languages a[aria-current]{font-weight:700;color:var(--accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;font-size:var(--text-small);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status :where(.grid,.servers-grid){min-width:0;max-width:100%}
.decorated{position:relative;overflow-x:clip;max-width:100%}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
@media(max-width:1200px){
  :root{--gutter:32px}
  .site-header .wrap{flex-wrap:wrap;row-gap:4px;padding-top:10px;padding-bottom:10px}
  .nav{order:3;width:100%;margin-left:0;overflow-x:auto;padding-bottom:4px}
  .header-tools{margin-left:auto}
}
@media(max-width:768px){
  :root{--h1-size:36px;--h2-size:28px;--h3-size:21px;--section-gap:48px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .nav{display:none}
  .site-header .wrap{flex-wrap:nowrap;gap:12px;padding-top:0;padding-bottom:0}
  .header-tools{margin-left:auto;gap:8px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer.is-open{display:block}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .brand-zh,.lang span{display:none}
  .brand-en{font-size:17px}
  .btn-login{padding-inline:12px;min-height:44px}
  .panel,.card{padding:20px}
  .tilt,.tilt-l,.tilt-r,.tilt-s{transform:none!important}
  .decorated{max-width:100%;overflow-x:clip}
  pre{padding:18px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  .btn,.btn svg,.nav-list a,.btn-login{transition:none}
}