:root{
  color-scheme:light;
  --bg:#F6F6F7;
  --bg-panel:#FFFFFF;
  --bg-panel2:#ECECEF;
  --bg-soft:#FAFAFB;
  --cell-face:#F1F1F4;
  --cell-edge:#E2E2E7;
  --cell-bore:#D5D5DB;
  --border:#DEDEE3;
  --border-strong:#CDCDD4;
  --accent:#E11D3F;
  --accent-2:#FF5A4E;
  --accent-dark:#A80F2C;
  --text:#121318;
  --text-muted:#5E606B;
  --text-faint:#8B8D97;
  --success:#15803D;
  --warn:#B7791F;
  --error:#B42318;
  --ink:#121318;
  --ink-2:#1E1F25;
  --ink-3:#34353D;
  --on-ink:#FFFFFF;
  --on-ink-muted:rgba(255,255,255,.62);
  --wash-top:rgba(225,29,63,.045);
  --wash-mid:rgba(225,29,63,.018);
  --accent-06:rgba(225,29,63,.06);
  --accent-08:rgba(225,29,63,.08);
  --accent-12:rgba(225,29,63,.12);
  --accent-22:rgba(225,29,63,.22);
  --accent-2-30:rgba(255,90,78,.30);
  --accent-2-45:rgba(255,90,78,.45);
  --success-14:rgba(21,128,61,.14);
  --shade-04:rgba(18,19,24,.04);
  --shade-06:rgba(18,19,24,.06);
  --shade-10:rgba(18,19,24,.10);
  --shade-16:rgba(18,19,24,.16);
  --shade-28:rgba(18,19,24,.28);
  --veil:rgba(18,19,24,.38);
  --dot:rgba(18,19,24,.085);
  --hi:rgba(255,255,255,.96);
  --hi-ink:rgba(255,255,255,.14);
  --flag-red:#D42A3C;
  --flag-white:#FFFFFF;
  --flag-blue:#2A3780;
  --flag-green:#118A50;
  --clear:transparent;
  --r-flag:3px;
  --r-xs:6px;
  --r-icon:7px;
  --r-sm:8px;
  --r-field:9px;
  --r-btn:10px;
  --r-md:12px;
  --r-lg:16px;
  --r-glow:19px;
  --r-round:50%;
  --r-pill:999px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-tiny:11px;
  --fs-micro:11.5px;
  --fs-caption:12px;
  --fs-caption-lg:12.5px;
  --fs-note:12.8px;
  --fs-small:13px;
  --fs-ui:13.5px;
  --fs-nav:14px;
  --fs-nav-lg:14.5px;
  --fs-button:15px;
  --fs-body:16px;
  --fs-brand:18px;
  --fs-lead:20px;
  --fs-h3:24px;
  --fs-h2:clamp(28px,3.5vw,44px);
  --fs-h1:clamp(52px,5vw,64px);
  --fs-h1-mobile:36px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-brand:800;
  --weight-display:900;
  --shell:1200px;
  --gutter:24px;
  --nav-h:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-section:80px;
  --shadow-panel:inset 0 1px 0 var(--hi),0 2px 6px var(--shade-04);
  --shadow-pop:0 18px 40px -14px var(--shade-16),0 2px 6px var(--shade-06);
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --time-fast:.15s;
  --time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);line-height:1.65;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,a,input,select,textarea,summary{-webkit-tap-highlight-color:var(--accent-08)}
button{border:0}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.5;transform:none}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);line-height:1.12;font-weight:var(--weight-display);letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);line-height:1.2;font-weight:var(--weight-display);letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--fs-h3);line-height:1.35;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-left:1.5em}
li+li{margin-top:6px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;background:var(--bg-panel2);border-radius:var(--r-xs);padding:2px 5px;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--ink);color:var(--on-ink);border-radius:var(--r-md);line-height:1.7}
pre code{background:var(--clear);padding:0;color:inherit;overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.no-break{white-space:nowrap}
.shell{width:min(var(--shell),calc(100% - 48px));margin:0 auto}
.wrap{width:100%;max-width:calc(var(--shell) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.stack>*+*{margin-top:24px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*,.split>*,.feature-tray>*,.footer-grid>*{min-width:0}
.split{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:32px}
.panel,.card{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);padding:24px;box-shadow:var(--shadow-panel)}
.panel-sunken{background:var(--bg-panel2)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.kicker{font-family:var(--font-mono);font-size:var(--fs-caption);color:var(--text-muted);letter-spacing:.06em}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px}
.section-head h2{margin:0}
.section-head .btn{flex-shrink:0}
.prose{max-width:800px;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.prose li{margin-bottom:8px}
.prose img{border-radius:var(--r-md)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border:1px solid var(--clear);border-radius:var(--r-btn);font-size:var(--fs-button);font-weight:var(--weight-semibold);letter-spacing:.01em;line-height:1.5;white-space:nowrap;transition:transform var(--time-fast) ease,background-color var(--time-fast) ease,box-shadow var(--time-fast) ease}
.btn:hover{transform:translateY(-1px)}
.btn-main,.btn-primary{background:var(--ink);color:var(--on-ink);box-shadow:inset 0 1px 0 var(--hi-ink),0 10px 22px -10px var(--shade-28),0 1px 2px var(--shade-10)}
.btn-main:hover,.btn-primary:hover{background:var(--ink-3)}
.btn-sub,.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border-strong);box-shadow:inset 0 1px 0 var(--hi),0 1px 2px var(--shade-06)}
.btn-sub:hover,.btn-secondary:hover{border-color:var(--text-faint)}
.btn:active{transform:translateY(0);box-shadow:inset 0 2px 4px var(--shade-16)}
.btn-small{min-height:36px;padding:6px 14px;font-size:var(--fs-small)}
.btn-text{background:var(--clear);color:var(--text);box-shadow:none}
.icon-button{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--r-sm);background:var(--bg-panel);border:1px solid var(--border)}
#site-header{position:sticky;top:0;z-index:70;background:var(--bg)}
.bar{height:var(--nav-h);display:flex;align-items:center;position:relative;z-index:72;flex-wrap:nowrap;gap:0}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:36px}
.brand img{width:26px;height:26px}
.brand-name{font-family:var(--font-display);font-weight:var(--weight-brand);font-size:var(--fs-brand);letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.nav{display:flex;align-items:center;flex:1;min-width:0;margin-left:36px}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav li{margin:0}
.nav-link,.more summary{display:inline-flex;align-items:center;gap:4px;min-height:36px;padding:0 12px;border-radius:var(--r-sm);font-size:var(--fs-nav-lg);color:var(--text-muted);cursor:pointer;white-space:nowrap;transition:color var(--time-fast) ease,background-color var(--time-fast) ease}
.nav-link:hover,.more summary:hover{color:var(--text);background:var(--shade-04)}
.nav-link[aria-current="page"],.more-pop a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.more{position:relative}
.more summary{list-style:none}
.more summary::-webkit-details-marker{display:none}
.more[open] summary{color:var(--text);background:var(--shade-04)}
.more-pop{position:absolute;top:calc(100% + 8px);left:0;z-index:75;min-width:180px;padding:6px;border-radius:var(--r-md);background:var(--bg-panel);border:1px solid var(--border);box-shadow:var(--shadow-pop);display:flex;flex-direction:column;gap:2px}
.more-pop a{display:flex;align-items:center;min-height:40px;padding:9px 12px;border-radius:var(--r-sm);font-size:var(--fs-nav);color:var(--text)}
.more-pop a:hover{background:var(--bg-panel2)}
.bar-end{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:0 12px;border-radius:var(--r-sm);font:inherit;font-size:var(--fs-nav);color:var(--text-muted);background:var(--clear);border:0;cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text);background:var(--shade-04)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;min-width:180px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-pop)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-nav)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:6px 18px;border-radius:var(--r-btn);background:var(--ink);color:var(--on-ink);font-size:var(--fs-nav);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-ink),0 6px 14px -8px var(--shade-28)}
.login:hover{background:var(--ink-3)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;background:var(--clear);color:var(--text);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{position:fixed;top:var(--nav-h);left:0;right:0;z-index:69;height:calc(100dvh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));padding:16px var(--gutter) 32px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);font-size:var(--fs-button)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel2)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.menu-veil{position:fixed;inset:var(--nav-h) 0 0;z-index:68;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--bg-panel2);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px}
.footer-brand p{font-size:var(--fs-nav);color:var(--text-muted);margin-top:18px;max-width:320px}
.footer-heading{font-size:var(--fs-nav);font-weight:var(--weight-semibold);margin:0 0 14px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px;font-size:var(--fs-small);color:var(--text-muted)}
.footer-links a:hover{color:var(--accent-dark)}
.footer-bottom{display:flex;align-items:center;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--fs-small);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.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-width:0;max-width:100%;min-height:80px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
#server-status>*{min-width:0;max-width:100%}
[data-counter]{display:inline-block;min-width:3ch;font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right}
.decorated-section{position:relative;max-width:100%;overflow-x:clip}
@media(max-width:1100px){
  .nav{margin-left:20px}
  .nav-link,.more summary{padding-inline:9px}
  .footer-grid{gap:24px}
}
@media(max-width:960px){
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:800px){
  .nav{display:none}
  .menu-toggle{display:inline-flex}
  .bar-end{margin-left:auto}
}
@media(min-width:801px){
  .mobile-drawer,.menu-veil{display:none}
  html.nav-open{overflow:auto}
}
@media(max-width:768px){
  h1{font-size:var(--fs-h1-mobile)}
}
@media(max-width:640px){
  :root{--gutter:16px;--space-section:48px}
  .no-break{white-space:normal}
  .shell{width:calc(100% - 32px)}
  .grid,.footer-grid{grid-template-columns:1fr}
  .section-head{align-items:flex-start;flex-direction:column}
  .panel,.card{padding:20px}
  .lang{padding-inline:6px}
  .lang span{display:none}
  .bar-end{gap:4px;margin-left:auto}
  .brand{gap:6px}
  .brand-name{font-size:var(--fs-body)}
  .login{padding-inline:12px;font-size:var(--fs-small)}
  .tilt,[data-tilt]{transform:none}
  .decorated-section>*{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}