:root{
  color-scheme:light;
  --bg:#E6EAF5;--bg-panel:#F7F8FD;--bg-panel-2:#D9DFEE;--border:#C8CFE2;
  --accent:#B72B3F;--accent-dark:#8A1C2E;--text:#141827;--text-muted:#596079;
  --success:#1F8A5B;--warn:#B7791F;--error:#D1432B;
  --hero-top:#EEF1FA;--hero-bottom:#DFE4F1;--rose:#E7B3BE;--white:#FFFFFF;
  --clear:transparent;--accent-10:rgba(183,43,63,.10);--accent-18:rgba(183,43,63,.18);
  --accent-30:rgba(183,43,63,.30);--success-18:rgba(31,138,91,.18);
  --groove:rgba(217,223,238,.62);--border-soft:rgba(200,207,226,.78);
  --nav-glass:rgba(247,248,253,.58);--dock-glass:rgba(238,241,250,.72);
  --hl:rgba(255,255,255,.92);--hl-soft:rgba(255,255,255,.55);
  --hl-on-accent:rgba(255,255,255,.24);--text-on-ink-muted:rgba(255,255,255,.72);
  --dot:rgba(20,24,39,.03);--shadow-accent:rgba(183,43,63,.10);
  --shadow-ink:rgba(20,24,39,.07);--shadow-ink-2:rgba(20,24,39,.14);
  --veil:rgba(20,24,39,.28);--halo-opacity:.14;
  --flag-red:#CF2E3E;--flag-white:#FFFFFF;--flag-blue:#24418C;--flag-navy:#2C3466;--flag-green:#1E8C4E;
  --radius-dot:50%;--radius-line:2px;--radius-flag:3px;--radius-xs:5px;--radius-chip:7px;
  --radius-s:8px;--radius-m:10px;--radius-platform:12px;--radius-l:14px;
  --radius-dock:18px;--radius-pill:999px;
  --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,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --size-body:16px;--size-h1:clamp(52px,5vw,68px);--size-h2:clamp(26px,3vw,36px);
  --gutter:24px;--content:1200px;--reading:800px;--header-bottom:88px;--toc-offset:16px;--anchor-offset:100px;
  --shadow-panel:inset 0 1px 0 var(--hl),0 12px 32px var(--shadow-accent),0 2px 6px var(--shadow-ink);
  --ease:cubic-bezier(.2,.7,.3,1);--duration:.15s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
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}
body,main,section,article,aside,header,footer,nav,div{min-width:0}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0;padding:0}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.12;font-weight:800;letter-spacing:-.02em}
h2{font-size:var(--size-h2);line-height:1.25;font-weight:750;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.4;font-weight:700}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,input,select,textarea{border:1px solid var(--border);border-radius:var(--radius-s);background:var(--bg-panel)}
button{padding:8px 12px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.5}
button:disabled:hover,.btn[aria-disabled="true"]:hover{transform:none}
a,button,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--accent-10)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
img{max-width:100%;height:auto;vertical-align:middle}
svg{vertical-align:middle;flex-shrink:0}
[hidden]{display:none!important}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;word-break:break-word;background:var(--groove);border-radius:var(--radius-xs);padding:2px 5px;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--radius-m);font-size:13px}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal;word-break:normal}
kbd{display:inline-grid;place-items:center;min-width:22px;height:22px;padding:0 6px;border:1px solid var(--border);border-radius:var(--radius-xs);background:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl),0 1px 0 var(--border);font-size:11.5px;color:var(--text)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-heading{margin-bottom:28px}
.section-heading p{max-width:720px;margin-top:12px;color:var(--text-muted)}
.stack>*+*{margin-top:20px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.prose{overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose table,.prose blockquote{margin-top:20px;margin-bottom:20px}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul,.prose ol{padding-left:24px}
.prose li+li{margin-top:8px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.prose p{line-height:1.85}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{border:1px solid var(--border);border-radius:var(--radius-l);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.panel{padding:28px}
.card{padding:24px}
.actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 18px;border:1px solid var(--clear);border-radius:var(--radius-s);font-size:15px;font-weight:600;letter-spacing:-.005em;line-height:22px;white-space:nowrap;flex-shrink:0;transition:transform var(--duration) var(--ease),box-shadow var(--duration) var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn svg{width:18px;height:18px}
.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent) 0%,var(--accent) 55%,var(--accent-dark) 170%);box-shadow:inset 0 1px 0 var(--hl-on-accent),0 1px 0 var(--accent-dark),0 8px 20px var(--accent-18)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--bg-panel);border-color:var(--border);box-shadow:inset 0 1px 0 var(--hl),0 1px 2px var(--shadow-ink)}
.btn-ghost svg{color:var(--text-muted)}
.btn-text{color:var(--text);background:var(--clear)}
.btn-primary:hover,.btn-demo-hover{background:var(--accent-dark)}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-demo-active{transform:translateY(1px);box-shadow:inset 0 2px 4px var(--shadow-ink-2)}
#site-header{position:relative;z-index:50;padding-inline:var(--gutter)}
.topbar{position:relative;z-index:5;max-width:1200px;height:56px;margin:16px auto 0;padding:0 10px 0 16px;display:flex;align-items:center;gap:24px;border:1px solid var(--border-soft);border-radius:var(--radius-l);background:var(--nav-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:inset 0 1px 0 var(--hl-soft)}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:28px}
.brand img,.brand svg{display:block;width:28px;height:28px}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:16px;letter-spacing:-.02em;color:var(--text)}
.brand-zh{font-size:14px;font-weight:500;color:var(--text-muted)}
.mainnav{flex:1;min-width:0;display:flex;justify-content:center}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.mainnav li{display:flex;align-items:center;flex-shrink:0}
.mainnav li+li::before{content:"·";margin:0 12px;color:var(--border);font-weight:700}
.mainnav a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted);padding:4px 2px;border-radius:var(--radius-xs);white-space:nowrap}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:600}
.topbar-end{display:flex;align-items:center;gap:8px;flex-shrink:0;flex-wrap:nowrap}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-width:44px;width:auto;height:34px;padding:0 10px;font-size:13px;color:var(--text-muted);border:0;border-radius:var(--radius-s);background:var(--clear);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--groove);color:var(--text)}
.language-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:80;min-width:170px;padding:6px;list-style:none;border:1px solid var(--border);border-radius:var(--radius-m);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.language-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--radius-xs);font-size:14px}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--groove)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 20px;border-radius:var(--radius-pill);background:var(--text);color:var(--white);font-size:14px;font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-on-accent),0 4px 12px var(--shadow-ink-2)}
.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(--clear);border:0;border-radius:var(--radius-s)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--radius-line)}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.mobile-drawer{display:none}
.menu-veil{position:fixed;inset:var(--header-bottom) 0 0;z-index:1;background:var(--veil);border:0;border-radius:0}
html.nav-open{overflow:hidden}
.footer-shell{margin-top:40px;border-top:1px solid var(--border);background:linear-gradient(180deg,var(--hero-top),var(--bg-panel-2));box-shadow:inset 0 1px 0 var(--hl)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px;padding-top:48px;padding-bottom:40px}
.footer-brand p{max-width:340px;margin-top:16px;font-size:14px;color:var(--text-muted)}
.footer-title{font-size:14px;font-weight:700;margin-bottom:12px}
.footer-links{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.legal-links a{display:inline-flex;align-items:center;min-height:32px;font-size:13px}
.footer-links a:hover,.footer-languages a:hover,.legal-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;padding-bottom:24px}
.footer-languages a[aria-current="true"]{font-weight:700}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;padding-top:20px;padding-bottom:28px;border-top:1px solid var(--border);font-size:12px;color:var(--text-muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity .35s var(--ease),transform .35s var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(max-width:1200px){
  .topbar{gap:16px}
  .mainnav li+li::before{margin-inline:8px}
  .mainnav a{font-size:13px}
}
@media(max-width:1080px){.brand-zh{display:none}}
@media(max-width:1024px){
  .mainnav{display:none}
  .topbar{justify-content:space-between}
  .topbar-end{margin-left:auto}
  .menu-toggle{display:flex}
  .mobile-drawer:not([hidden]){position:fixed;display:block;top:var(--header-bottom);left:var(--gutter);right:var(--gutter);z-index:4;height:calc(100dvh - var(--header-bottom) - 16px);max-height:calc(100dvh - var(--header-bottom) - 16px);overflow-y:auto;overscroll-behavior:contain;padding:16px;border:1px solid var(--border);border-radius:var(--radius-l);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
  .mobile-drawer ul{list-style:none}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--radius-s)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--groove)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:16px;--size-h1:38px;--size-h2:28px}
  h1{line-height:1.15}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three,.grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .topbar{gap:8px;padding-inline:10px;flex-wrap:nowrap}
  .brand{gap:7px}
  .brand-en{font-size:15px}
  .brand img{width:26px;height:26px}
  .topbar-end{gap:2px;margin-left:auto}
  .language-picker{display:none}
  .login{padding-inline:14px;font-size:13px}
  .grid-three,.grid-five{grid-template-columns:1fr}
  .panel,.card{padding:20px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .tilt,[data-tilt]{transform:none}
  .halo,.stripe-halo{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}