:root{
  color-scheme:light;
  --bg:#E8F0F6;
  --bg-top:#F1F6FA;
  --bg-bottom:#E2EBF2;
  --panel:#F7FAFD;
  --panel-2:#DCE7F0;
  --border:#CCDAE6;
  --card-edge:rgba(204,218,230,.85);
  --line-soft:rgba(204,218,230,.7);
  --accent:#27904E;
  --accent-dark:#1C6A39;
  --accent-light:#3FAE69;
  --accent-soft:#E0F0E6;
  --slate:#2A3D56;
  --slate-soft:#3E5675;
  --slate-tint:#E4ECF4;
  --text:#1E2B3C;
  --muted:#5A6B7E;
  --subtle:#8696A9;
  --white:#FFFFFF;
  --success:#23915A;
  --warn:#C98A12;
  --error:#C8423A;
  --gold:#C98A12;
  --gold-light:#EDC765;
  --mint:#C9F2D7;
  --glass-tint:#CFE9EE;
  --ice:rgba(130,214,226,.34);
  --flag-red:#D23A3F;
  --flag-blue:#2C4A86;
  --hl:rgba(255,255,255,.92);
  --hl-soft:rgba(255,255,255,.35);
  --hl-faint:rgba(255,255,255,.14);
  --nav-glass:rgba(247,250,253,.8);
  --veil:rgba(30,43,60,.24);
  --shadow-green:rgba(39,144,78,.10);
  --shadow-green-strong:rgba(39,144,78,.24);
  --shadow-slate:rgba(42,61,86,.24);
  --shadow-ink:rgba(30,43,60,.06);
  --card-wash:#E9F4ED;
  --card-wash-cool:#E8EFF5;
  --clear:transparent;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:10px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:24px;
  --wrap:1160px;
  --header-height:64px;
  --anchor-gap:80px;
  --toc-offset:88px;
  --text-xs:13px;
  --text-sm:14px;
  --text-base:16px;
  --text-lead:20px;
  --text-h1:clamp(52px,4.5vw,64px);
  --text-h2:clamp(28px,3vw,36px);
  --text-h3:22px;
  --shadow-panel:inset 0 1px 0 var(--hl),0 24px 56px -24px var(--shadow-green);
  --shadow-button:inset 0 1px 0 var(--hl-soft),0 10px 22px -8px var(--shadow-green-strong);
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --time-fast:.2s;
  --time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-gap)}
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}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--clear)}
button:disabled{cursor:not-allowed}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
[hidden]{display:none!important}
img,video,canvas{max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:500;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--text-h1);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--text-h2);line-height:1.3;margin:0 0 24px}
h3{font-size:var(--text-h3);line-height:1.4}
p{margin:0 0 20px}
ul,ol{padding-inline-start:24px}
li{margin-block:4px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-heading{max-width:760px;margin-inline:auto;margin-bottom:40px;text-align:center}
.section-heading p{color:var(--muted)}
.grid-two,.grid-three{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two>*,.grid-three>*,.wrap>*,main,article,section{min-width:0}
.stack>*+*{margin-top:24px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.kw{color:var(--accent)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel,.card{padding:28px;background:var(--panel);border:1px solid var(--card-edge);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.panel--recessed{background:var(--panel-2);box-shadow:inset 0 1px 3px var(--shadow-ink)}
.badge,.chip{display:inline-flex;align-items:center;gap:6px;max-width:100%;min-height:26px;padding:3px 12px;border-radius:var(--r-pill);background:var(--accent-soft);color:var(--accent-dark);font-size:var(--text-xs);font-weight:600;overflow-wrap:anywhere}
.badge--slate{background:var(--slate-tint);color:var(--slate)}
.status-dot{display:inline-block;width:7px;height:7px;background:var(--success);border-radius:var(--r-round);flex-shrink:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;flex-shrink:0;min-width:164px;height:48px;padding:0 30px;border:1px solid var(--clear);border-radius:var(--r-sm);font-size:var(--text-base);font-weight:600;letter-spacing:.04em;white-space:nowrap;transition:transform var(--time-fast),background var(--time-fast)}
.btn:hover{transform:translateY(-1px)}
.btn-green,.btn-primary{background:linear-gradient(180deg,var(--accent-light),var(--accent) 62%);color:var(--white);box-shadow:var(--shadow-button)}
.btn-green:active,.btn-primary:active,.btn.is-active{background:var(--accent-dark);transform:translateY(0)}
.btn-slate,.btn-secondary{background:linear-gradient(180deg,var(--slate-soft),var(--slate) 62%);color:var(--white);box-shadow:inset 0 1px 0 var(--hl-faint),0 10px 22px -10px var(--shadow-slate)}
.btn-ghost{background:var(--panel);border-color:var(--border);color:var(--slate)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;transform:none}
.btn[aria-disabled="true"]{pointer-events:none}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.button-row{display:flex;align-items:center;flex-wrap:wrap;gap:14px}
.topbar{position:relative;z-index:50;background:var(--nav-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}
.topbar-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:var(--header-height);display:flex;align-items:center;flex-wrap:nowrap;gap:18px}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand-mark{display:block;width:32px;height:32px;flex-shrink:0;border-radius:var(--r-sm);box-shadow:inset 0 1px 0 var(--hl-soft),0 6px 14px -4px var(--shadow-green-strong)}
.brand-word{font-family:var(--font-display);font-weight:700;font-size:19px;letter-spacing:.03em;color:var(--text)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.mainnav li{margin:0}
.nav-more-toggle{border:0;background:none;display:flex;align-items:center;min-height:36px;padding:7px 6px;font-size:14.5px;line-height:20px;color:var(--muted);white-space:nowrap;cursor:pointer;list-style:none}
.nav-more-toggle::-webkit-details-marker{display:none}
.nav-more-toggle:hover{color:var(--text);background:var(--slate-tint)}
.mainnav a{display:block;padding:7px 6px;border-radius:var(--r-pill);font-size:14.5px;line-height:20px;color:var(--muted);white-space:nowrap}
.mainnav a:hover{color:var(--text);background:var(--slate-tint)}
.mainnav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark);font-weight:600}
.topbar-end{display:flex;align-items:center;gap:14px;flex-shrink:0}
.language-switch{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:36px;width:auto;border:0;background:none;padding:6px 4px;font-size:var(--text-sm);color:var(--muted);cursor:pointer}
.lang svg{width:15px;height:15px;flex:none}
.lang-text{white-space:nowrap}
.lang-caret{font-size:11px;color:var(--subtle)}
.language-panel{position:absolute;z-index:70;top:calc(100% + 10px);right:0;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:0 16px 36px -12px var(--shadow-slate)}
.language-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--text-sm);white-space:nowrap}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.topbar-rule{width:1px;height:20px;background:var(--border);flex-shrink:0}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;min-width:64px;padding:0 20px;border-radius:var(--r-sm);background:var(--slate);color:var(--white);font-size:var(--text-sm);font-weight:600;letter-spacing:.04em;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-faint),0 6px 14px -8px var(--shadow-slate);transition:transform var(--time-fast)}
.login:hover{transform:translateY(-1px)}
.menu-btn{display:none;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--slate);align-items:center;justify-content:center}
.menu-btn svg{width:20px;height:20px}
.nav-drawer{position:fixed;z-index:45;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:20px var(--gutter) 32px;border-bottom:1px solid var(--border)}
.nav-drawer ul{list-style:none;margin:0;padding:0}
.nav-drawer li{margin:0}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm)}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--accent-soft);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:40;border:0;background:var(--veil)}
html.nav-open{overflow:hidden}
html.nav-open .topbar{position:sticky;top:0}
.site-footer{padding-top:56px;padding-bottom:24px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.1fr 1fr 1.2fr;gap:48px}
.footer-brand p{max-width:320px;margin-top:20px;font-size:var(--text-sm);color:var(--muted)}
.footer-title{margin:0 0 16px;font-size:var(--text-base);font-weight:600}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px;list-style:none;padding:0;margin:0}
.footer-links li{margin:0;min-width:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:20px;font-size:var(--text-xs);color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.prose{max-width:820px;line-height:1.85;overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li{margin-block:10px}
.prose section[id]{scroll-margin-top:var(--anchor-gap)}
.prose img{border-radius:var(--r-sm)}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:160px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
#server-status>*{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){
  .topbar-inner{gap:18px}
  .mainnav a{padding:7px 4px;font-size:var(--text-sm)}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar-inner{justify-content:space-between}
  .topbar-end{margin-left:auto}
  .menu-btn{display:inline-flex}
}
@media(min-width:1101px){
  .nav-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  :root{--text-h1:clamp(28px,6vw,40px);--text-h2:28px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-two,.grid-three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .lang-text{display:none}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .topbar-inner{padding-inline:var(--gutter);gap:10px}
  .topbar-end{gap:8px;margin-left:auto}
  .topbar-rule{display:none}
  .brand{gap:7px}
  .brand-word{font-size:17px}
  .brand-mark{width:28px;height:28px}
  .login{padding-inline:12px;min-width:54px}
  .lang{padding-inline:2px}
  .panel,.card{padding:20px}
  .btn{min-width:0;padding-inline:24px;max-width:100%}
  .tilt,.tilt-decoration,[data-tilt]{transform:none}
  .decorated{max-width:100%}
  .footer-links{gap:8px 16px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.login{transition:none}
  .btn:hover,.login:hover{transform:none}
}