:root{
  color-scheme:light;
  --bg:#E3ECF2;--bg-top:#EDF3F7;--bg-bottom:#DCE6ED;
  --panel:#F6FAFC;--panel-2:#D5E2EA;--window:#FFFFFF;
  --border:#C3D3DE;--border-strong:#A9BDCB;--row-line:rgba(195,211,222,.55);
  --accent:#8DB81A;--accent-2:#B6D43A;--accent-dark:#4C6610;--accent-edge:#7FA617;
  --accent-ink-a:#5F8210;--accent-ink-b:#7AA214;
  --text:#13222C;--ink-2:#22394A;--muted:#4E6170;--faint:#8FA2B0;
  --success:#1E8A5A;--warn:#B7791F;--error:#C2413A;
  --grid-line:rgba(19,34,44,.04);--sketch:rgba(19,34,44,.22);
  --lime-wash:rgba(141,184,26,.06);--lime-wash-2:rgba(141,184,26,.16);--lime-ring:rgba(141,184,26,.20);
  --tile:rgba(255,255,255,.55);--hl:rgba(255,255,255,.95);--veil:rgba(19,34,44,.32);
  --shadow-card:0 12px 32px rgba(141,184,26,.10),0 1px 2px rgba(19,34,44,.05);
  --shadow-window:0 22px 40px rgba(141,184,26,.12),0 2px 6px rgba(19,34,44,.06);
  --shadow-float:0 10px 24px rgba(141,184,26,.16),0 1px 3px rgba(19,34,44,.08);
  --shadow-btn:0 6px 16px rgba(141,184,26,.28),inset 0 1px 0 rgba(255,255,255,.45);
  --shadow-groove:inset 0 1px 2px rgba(19,34,44,.06);
  --flag-red:#D9283A;--flag-white:#FFFFFF;--flag-blue:#2F3A6E;--flag-black:#15181B;--flag-gold:#FFCE00;--flag-edge:rgba(19,34,44,.16);
  --radius:6px;--radius-sm:4px;--radius-tiny:2px;--pill:999px;--round:50%;
  --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;
  --weight-regular:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;
  --size-body:16px;--size-small:14px;--size-caption:12px;--size-h1:64px;--size-h2:32px;--size-h3:20px;
  --gutter:32px;--page-width:1312px;--header-height:64px;--anchor-offset:80px;--toc-offset:148px;
  --ease-out:cubic-bezier(.2,.7,.3,1);--speed-fast:.15s;--speed-card:.2s;--speed-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--lime-ring)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55;box-shadow:none;transform:none}
h1,h2,h3{font-family:var(--font-display);color:var(--text);overflow-wrap:break-word}
h1{margin:24px 0 0;font-weight:var(--weight-heavy);font-size:var(--size-h1);line-height:1.1;letter-spacing:-.02em}
h2{margin:0;font-size:var(--size-h2);font-weight:var(--weight-heavy);line-height:1.25;letter-spacing:-.02em}
h3{margin:0;font-size:var(--size-h3);line-height:1.4;font-weight:var(--weight-bold)}
p{margin:0 0 20px}
strong{font-weight:var(--weight-semibold)}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--panel)}
pre code{white-space:pre;overflow-wrap:normal}
table{border-collapse:collapse}
fieldset{min-width:0}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*,:where(.bento,.fgrid,.card-grid,.footer-grid)>*{min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.soft{display:block;color:var(--muted);font-weight:var(--weight-bold)}
.section{padding-top:64px;padding-bottom:64px}
.section-head,.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:28px}
.sec-note{max-width:420px;margin:0;font-size:15px;color:var(--muted)}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--radius);background:var(--panel);box-shadow:var(--shadow-card)}
.panel-inset{background:var(--panel-2);box-shadow:var(--shadow-groove)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.decor-host{position:relative;overflow-x:clip}
.decor-grid{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:32px 32px;max-width:100%}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border:1px solid transparent;border-radius:var(--radius);font-size:15px;font-weight:var(--weight-semibold);white-space:nowrap;flex-shrink:0;transition:transform var(--speed-fast) ease,background-color var(--speed-fast) ease}
.btn svg{width:16px;height:16px}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background-image:linear-gradient(180deg,var(--accent-2),var(--accent));border-color:var(--accent-edge);color:var(--text);box-shadow:var(--shadow-btn)}
.btn-primary:hover{background-image:linear-gradient(180deg,var(--accent-2),var(--accent-edge))}
.btn-ghost,.btn-secondary{background:var(--window);border-color:var(--text);color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn-small{min-height:36px;padding-inline:14px;font-size:var(--size-small)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.site-head{position:relative;z-index:50;border-bottom:1px solid var(--border);background:var(--bg-top)}
.head-row{display:flex;align-items:center;height:var(--header-height);gap:40px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:19px;letter-spacing:-.02em;color:var(--text);flex-shrink:0;min-height:36px}
.brand img{width:28px;height:28px;flex-shrink:0}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.nav{flex:1;min-width:0}
.nav ul{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav a{display:block;min-height:32px;padding:6px 0;font-size:14.5px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:color var(--speed-fast) ease}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.head-tools{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:0 10px;font-size:var(--size-small);color:var(--muted);background:transparent;border:1px solid transparent;border-radius:var(--radius);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{border-color:var(--border);color:var(--text)}
.lang svg{width:15px;height:15px}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:70;min-width:176px;padding:6px;border:1px solid var(--border);border-radius:var(--radius);background:var(--window);box-shadow:var(--shadow-window)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-sm);font-size:var(--size-small);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--radius);background:var(--text);color:var(--window);font-size:var(--size-small);font-weight:var(--weight-semibold);white-space:nowrap}
.btn-login:hover{background:var(--ink-2)}
.menu-btn{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--radius);background:var(--window);color:var(--text)}
.menu-btn svg{width:20px;height:20px}
.menu-btn[aria-expanded="true"]{background:var(--panel-2);border-color:var(--text)}
.mobile-drawer{display:none;position:fixed;top:var(--header-height);right:0;left:0;z-index:45;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);border-top:1px solid var(--border)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-bottom:1px solid var(--border);color:var(--text)}
.mobile-drawer a[aria-current]{font-weight:var(--weight-bold);background:var(--panel-2)}
.drawer-languages{margin-top:20px;padding-top:12px;border-top:1px solid var(--border)}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:40;background:var(--veil);border:0}
.site-foot{padding-top:48px;padding-bottom:24px;border-top:1px solid var(--border);background:var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin:16px 0 0;color:var(--muted);font-size:var(--size-small)}
.footer-title{margin:0 0 12px;font-size:var(--size-small);font-weight:var(--weight-bold)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;list-style:none;margin:0;padding:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;padding-block:2px;font-size:13px;color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border)}
.footer-languages a[aria-current="true"]{color:var(--text);font-weight:var(--weight-bold)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:20px;font-size:var(--size-caption);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity var(--speed-reveal) ease,transform var(--speed-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
.prose{max-width:860px;min-width:0;line-height:1.85;overflow-wrap:break-word}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:28px;margin-bottom:12px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li{margin-bottom:8px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media(max-width:1280px){
  .head-row{gap:24px}
  .nav ul{gap:16px}
  .nav a{font-size:13px}
}
@media(max-width:1180px){
  .nav{display:none}
  .menu-btn{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
  .nav-veil:not([hidden]){display:block}
  .head-tools{margin-left:auto}
}
@media(min-width:1181px){
  .mobile-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  :root{--gutter:16px;--size-h1:38px;--size-h2:26px}
  .head-row{gap:16px}
  .head-tools{margin-left:auto}
  h1{margin-top:20px;line-height:1.15}
  .section{padding-top:40px;padding-bottom:40px}
  .section-head,.sec-head{flex-direction:column;align-items:flex-start;gap:12px}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
  .decor-grid{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .lang span{display:none}
  .lang{padding-inline:8px}
  .card-grid{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:380px){
  .head-row{gap:8px}
  .brand{font-size:17px;gap:6px}
  .brand img{width:26px;height:26px}
  .head-tools{gap:4px}
  .btn-login{padding-inline:12px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
  .btn:hover{transform:none}
}