:root {
  --bg:#E9EFF8;
  --bg-top:#F3F6FC;
  --bg-bottom:#E3EAF5;
  --panel:#F8FAFE;
  --panel-2:#DCE5F2;
  --panel-3:#EEF2F9;
  --border:#CBD6E6;
  --border-soft:#DAE2EE;
  --border-strong:#B7C4D8;
  --accent:#E07B12;
  --accent-dark:#A9570A;
  --text:#172033;
  --text-muted:#5A6679;
  --text-faint:#8690A3;
  --success:#2E9E6A;
  --success-50:#DCF1E6;
  --success-ring:rgba(46,158,106,.18);
  --warn:#C99A12;
  --error:#D2453F;
  --white:#FFFFFF;
  --ink-hi:#27354F;
  --ink-lo:#121A2B;
  --gold-50:#FBF0D9;
  --gold-200:#F0D8A6;
  --gold-600:#A9650E;
  --coral-50:#FCE4E1;
  --coral-200:#F4B6AF;
  --coral-500:#DB6A62;
  --coral-600:#BF4E47;
  --mint-50:#DCF1E7;
  --mint-200:#A3DBC0;
  --mint-500:#38A474;
  --mint-600:#2A8A5F;
  --sky-50:#E0ECFA;
  --sky-200:#A9C8EF;
  --sky-500:#4E85CE;
  --sky-600:#2F69AE;
  --lav-50:#ECE7FA;
  --lav-600:#6A55B5;
  --graph-line:#9DAFC8;
  --grid-dot:#C3D0E2;
  --texture:#AFBED3;
  --glow-in:rgba(224,123,18,.085);
  --glow-out:rgba(224,123,18,0);
  --nav-line:rgba(203,214,230,.75);
  --gloss:rgba(255,255,255,.62);
  --groove-shadow:rgba(30,56,110,.08);
  --veil:rgba(23,32,51,.28);
  --flag-red:#D7333D;
  --flag-navy:#2A3F7A;
  --flag-white:#FFFFFF;
  --flag-green:#17924E;
  --flag-edge:rgba(23,32,51,.16);
  --shadow-card:inset 0 1px 0 rgba(255,255,255,.9),0 4px 10px -4px rgba(30,56,110,.08),0 18px 42px -10px rgba(30,56,110,.10);
  --shadow-chip:0 8px 20px -8px rgba(30,56,110,.20);
  --shadow-tab:0 1px 2px rgba(30,56,110,.14);
  --shadow-win:0 2px 6px rgba(30,56,110,.06),0 32px 72px -24px rgba(30,56,110,.26),0 72px 120px -48px rgba(30,56,110,.18);
  --shadow-btn:inset 0 1px 0 rgba(255,255,255,.14),0 10px 22px -10px rgba(18,26,43,.55);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:5px;
  --r-sm:8px;
  --r-button:9px;
  --r-tab:7px;
  --r-card:10px;
  --r-win:14px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:24px;
  --wrap:1200px;
  --header-height:64px;
  --toc-offset:84px;
  --anchor-offset:156px;
  --ease-fast:.15s;
  --ease-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px;scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary{-webkit-tap-highlight-color:var(--success-ring)}
:focus-visible{outline:2px solid var(--sky-600);outline-offset:3px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,5vw,68px);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h2{font-size:40px;font-weight:900;line-height:1.2;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.35}
p{margin:0 0 1em}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{word-break:keep-all}
:where(main,section,article,aside,div,li){min-width:0}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-title{margin:0 0 20px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.skip{position:absolute;left:16px;top:-60px;z-index:100;padding:8px 14px;border-radius:var(--r-sm);background:var(--text);color:var(--white);font-size:14px}
.skip:focus{top:12px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.page{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--bg-top) 0,var(--bg-bottom) 1040px,var(--bg-bottom) 100%)}
.page::before{content:"";position:absolute;top:-180px;left:-10%;width:60%;height:780px;max-width:100%;background:radial-gradient(closest-side,var(--glow-in),var(--glow-out));pointer-events:none;z-index:0}
.topbar,#site-header{position:relative;z-index:70;border-bottom:1px solid var(--nav-line)}
.topbar-in{max-width:1440px;height:var(--header-height);margin:0 auto;padding:0 40px;display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:30px}
.brand-mark{width:30px;height:30px}
.brand-word{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.02em;color:var(--text)}
.mainnav{flex:1;min-width:0;display:flex;justify-content:center}
.mainnav > ul{display:flex;align-items:center;flex-shrink:0;list-style:none;margin:0;padding:0;gap:clamp(10px,1vw,16px)}
.nav-overflow{position:relative;list-style:none}
.nav-more{display:flex;align-items:center;min-height:32px;padding:0;border:0;background:none;font-size:14px;font-weight:500;color:var(--text-muted);white-space:nowrap;cursor:pointer}
.nav-more::after{content:'▾';margin-left:6px}
.mainnav .nav-more-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:90;display:grid;gap:0;min-width:200px;max-width:min(460px,80vw);margin:0;padding:8px;list-style:none;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card)}
.mainnav .nav-more-panel a{display:flex;min-height:44px;padding:8px 12px;white-space:normal}
.mainnav .nav-more-panel a:hover{background:var(--panel-2)}
.mainnav a{display:inline-flex;align-items:center;min-height:32px;font-size:15px;font-weight:500;color:var(--text-muted);white-space:nowrap;transition:color var(--ease-fast)}
.mainnav a:hover,.mainnav a[aria-current="page"]{color:var(--text)}
.mainnav a[aria-current="page"]{font-weight:700}
.top-tools{display:flex;align-items:center;gap:20px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;min-height:32px;min-width:44px;width:auto;font-size:14px;font-weight:500;color:var(--text-muted);background:none;border:0;padding:6px 2px;white-space:nowrap}
.lang:hover{color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:90;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-xs);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:var(--r-sm);background:linear-gradient(180deg,var(--ink-hi),var(--ink-lo));color:var(--white);font-size:14px;font-weight:600;box-shadow:var(--shadow-btn);white-space:nowrap}
.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(--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;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);z-index:72}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--border-soft)}
.mobile-drawer a[aria-current]{font-weight:700;color:var(--text)}
.drawer-languages{margin-top:20px;border-top:1px solid var(--border)}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--veil);z-index:71;border:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 22px;border:1px solid transparent;border-radius:var(--r-button);font-size:15.5px;font-weight:600;line-height:1.4;transition:transform var(--ease-fast),box-shadow var(--ease-fast);flex-shrink:0;white-space:nowrap}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,var(--ink-hi),var(--ink-lo));color:var(--white);box-shadow:var(--shadow-btn)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost,.btn-secondary{background:var(--panel);border-color:var(--border-strong);color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text-faint)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;box-shadow:none;transform:none}
.cta-row{display:flex;gap:12px;justify-content:center;margin-top:26px}
.panel,.card{padding:28px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card)}
.reveal{transition:opacity var(--ease-reveal) ease,transform var(--ease-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;width:100%;max-width:100%;overflow:hidden;margin-block:24px}
#server-status + *{margin-top:24px}
.site-footer{position:relative;background:var(--panel);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer-brand p{margin:18px 0 0;max-width:350px;color:var(--text-muted);font-size:14px}
.footer-heading{margin:0 0 14px;font-size:15px;font-weight:700}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:36px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;gap:20px}
.prose{max-width:800px}
.prose h2{margin-top:48px;font-size:30px}
.prose h3{margin-top:28px}
.prose p,.prose li{line-height:1.85}
.prose a{text-decoration:underline;text-underline-offset:4px}
.prose img{border-radius:var(--r-card)}
@media(max-width:1200px){
  .topbar-in{gap:20px;padding-inline:24px}
  .top-tools{gap:12px}
  .mainnav a{font-size:14px}
}
@media(max-width:1080px){
  .mainnav{display:none}
  .top-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
}
@media(min-width:1081px){
  .mobile-drawer,.menu-veil{display:none}
  html.nav-open{overflow:auto}
}
@media(max-width:768px){
  h1{font-size:40px}
  h2{font-size:30px}
  .section{padding-top:56px;padding-bottom:56px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  h1{font-size:34px}
  .topbar-in{padding-inline:16px;gap:8px}
  .top-tools{gap:6px;margin-left:auto}
  .brand{gap:6px}
  .brand-mark{width:26px;height:26px}
  .brand-word{font-size:17px}
  .lang{font-size:12px}
  .btn-login{padding-inline:12px;font-size:13px}
  .cta-row{flex-direction:column;width:100%}
  .btn{justify-content:center}
  .tilt,[data-tilt]{transform:none!important}
  .page::before{max-width:100%}
  .footer-grid{gap:28px 20px}
  .panel,.card{padding:20px}
}
@media(max-width:359px){
  .topbar-in{padding-inline:12px}
  .brand-word{font-size:15px}
  .brand-mark{width:24px;height:24px}
  .top-tools{gap:3px}
  .btn-login{padding-inline:9px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}