:root{
  --bg:#F8F2E6;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#EFE6D4;
  --border:#E2D6BF;
  --accent:#3D4BE8;
  --accent-dark:#2A34B8;
  --accent-violet:#6B4CE6;
  --text:#2A2118;
  --text-muted:#6E6252;
  --success:#1E9A72;
  --warn:#C8851A;
  --error:#C2412D;
  --hero-top:#FBF7EE;
  --hero-bottom:#F3EBDB;
  --on-dark:#F4ECDD;
  --white:#FFFFFF;
  --clear:transparent;
  --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;
  --r-tray:30px;
  --r-xl:24px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --r-mini:9px;
  --r-strip:12px;
  --r-float:18px;
  --r-pill:999px;
  --r-circle:50%;
  --shell:1440px;
  --reading:880px;
  --gutter:56px;
  --nav-h:72px;
  --toc-offset:148px;
  --grid-size:32px;
  --grid-line:color-mix(in srgb,var(--text) 4%,transparent);
  --hi-edge:inset 0 1px 0 color-mix(in srgb,var(--white) 92%,transparent);
  --shadow-panel:0 24px 48px color-mix(in srgb,var(--accent) 10%,transparent),0 2px 8px color-mix(in srgb,var(--text) 6%,transparent);
  --shadow-float:0 14px 28px -8px color-mix(in srgb,var(--text) 22%,transparent),0 2px 6px color-mix(in srgb,var(--text) 8%,transparent);
  --gradient-accent:linear-gradient(100deg,var(--accent) 8%,var(--accent-violet) 92%);
  --ease:0.2s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:calc(var(--nav-h) + 16px);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);color:var(--text);line-height:1.6;background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,var(--clear) 1px),linear-gradient(90deg,var(--grid-line) 1px,var(--clear) 1px);background-size:var(--grid-size) var(--grid-size);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,4.4vw,64px);font-weight:800;line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(26px,2.8vw,38px);line-height:1.25;letter-spacing:-.015em}
h3{font-size:22px;line-height:1.35}
p{margin-bottom:20px}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--bg-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.shell,.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:72px;padding-bottom:72px}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*{min-width:0}
.panel,.card{min-width:0;padding:28px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--bg-panel);box-shadow:var(--hi-edge),var(--shadow-panel)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:52px;padding:0 26px;border:0;border-radius:var(--r-md);font-family:var(--font-display);font-size:16px;font-weight:700;letter-spacing:-.005em;flex-shrink:0;white-space:nowrap;transition:transform var(--ease),box-shadow var(--ease)}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 88%,var(--white)) 0%,var(--accent) 55%,color-mix(in srgb,var(--accent) 80%,var(--accent-dark)) 100%);color:var(--bg-panel);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 30%,transparent),0 12px 26px -8px color-mix(in srgb,var(--accent) 55%,transparent)}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 30%,transparent),0 16px 30px -8px color-mix(in srgb,var(--accent) 60%,transparent)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);border:1px solid var(--border);box-shadow:var(--hi-edge),0 4px 10px -4px color-mix(in srgb,var(--text) 14%,transparent)}
.btn-ghost:hover,.btn-secondary:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--text) 25%,var(--border))}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none;box-shadow:none;pointer-events:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.topbar{position:sticky;top:0;z-index:30;height:var(--nav-h);background:color-mix(in srgb,var(--bg-panel) 78%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid color-mix(in srgb,var(--border) 75%,transparent)}
.topbar .shell{height:100%;display:flex;align-items:center;gap:32px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text);flex-shrink:0;min-height:32px}
.brand img{width:32px;height:32px;flex-shrink:0}
.brand-zh{font-weight:500;color:var(--text-muted)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;font-size:14.5px;white-space:nowrap}
.mainnav li{display:flex;align-items:center}
.mainnav li+li::before{content:"·";padding:0 12px;font-weight:700;color:color-mix(in srgb,var(--text-muted) 50%,transparent)}
.mainnav a{padding:6px 1px;min-height:24px;color:var(--text-muted);transition:color var(--ease)}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:600;background-image:linear-gradient(var(--accent),var(--accent));background-repeat:no-repeat;background-size:100% 2px;background-position:0 100%}
.tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:14px;color:var(--text-muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:color-mix(in srgb,var(--bg-panel-2) 70%,transparent);color:var(--text)}
.lang svg{width:16px;height:16px}
.lang-menu{position:absolute;right:0;top:calc(100% + 12px);width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-float)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);font-size:14px;font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 color-mix(in srgb,var(--on-dark) 22%,transparent),0 6px 14px -4px color-mix(in srgb,var(--text) 35%,transparent);transition:transform var(--ease),background-color var(--ease)}
.btn-login:hover{transform:translateY(-1px);background:color-mix(in srgb,var(--text) 88%,var(--accent-dark))}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--nav-h) 0 0;z-index:20;background:color-mix(in srgb,var(--text) 30%,transparent)}
.site-footer{padding-top:56px;padding-bottom:24px;border-top:1px solid var(--border);background:var(--bg-panel-2)}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:18px;font-size:14px;color:var(--text-muted);max-width:320px}
.footer-heading{font-size:14px;font-weight:700;margin-bottom:14px}
.footer-links{display:grid;gap:6px;font-size:14px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted)}
.footer-links a:hover{color:var(--accent-dark)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{min-height:24px;display:inline-flex;align-items:center}
.prose{min-width:0;overflow-wrap:anywhere}
.prose p,.prose li{line-height:1.85}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose ul{list-style:disc;padding-left:24px;margin-bottom:24px}
.prose ol{padding-left:24px;margin-bottom:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
#server-status{position:static;display:block;min-width:0;max-width:100%;min-height:180px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
@media(max-width:1200px){
  :root{--gutter:32px}
  .topbar .shell{gap:20px}
  .mainnav li+li::before{padding-inline:8px}
  .mainnav ul{font-size:13px}
  .tools{gap:8px}
}
@media(max-width:1024px){
  .mainnav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;top:var(--nav-h);left:0;right:0;z-index:31;background:var(--bg-panel);border-bottom:1px solid var(--border);padding:16px var(--gutter);max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow-panel)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);color:var(--text)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .grid{grid-template-columns:1fr}
  .sec{padding-top:48px;padding-bottom:48px}
}
@media(max-width:640px){
  :root{--gutter:20px;--toc-offset:140px}
  .no-break{white-space:normal}
  .tilt,.rig{transform:none}
  .topbar .shell{gap:8px}
  .tools{margin-left:auto;gap:6px}
  .brand{font-size:18px;gap:7px}
  .brand img{width:28px;height:28px}
  .lang{padding-inline:6px}
  .btn-login{padding-inline:14px}
  .panel,.card{padding:20px}
  .footer-grid{gap:28px}
  .footer-brand{grid-column:1/-1}
  .reading-wrap{padding-inline:var(--gutter)}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .tools{gap:3px}
  .lang{font-size:12px;padding-inline:4px}
  .btn-login{padding-inline:12px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn-login,.mainnav a{transition:none}
}