:root{
  --bg:#F7F8F3;
  --bg-panel:#FDFDFA;
  --bg-panel-2:#EEEFE8;
  --border:#DFE0D7;
  --accent:#C77B30;
  --accent-deep:#A9621F;
  --accent-dark:#9A5A1C;
  --text:#1E1F1B;
  --text-muted:#6B6D64;
  --success:#3F8A55;
  --warn:#B07A12;
  --error:#B5403A;
  --white:#FFFFFF;
  --transparent:transparent;
  --ink-soft:color-mix(in oklab,var(--text) 80%,var(--text-muted));
  --hl:color-mix(in srgb,var(--white) 85%,transparent);
  --veil:color-mix(in srgb,var(--text) 26%,transparent);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --r-xs:4px;
  --r-sm:6px;
  --r-md:8px;
  --r-lg:10px;
  --r-pill:999px;
  --wrap:1248px;
  --gutter:24px;
  --head-height:64px;
  --toc-height:64px;
  --anchor-offset:144px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-strong:600;
  --shadow-window:inset 0 1px 0 var(--hl),0 1px 2px color-mix(in srgb,var(--accent-dark) 10%,transparent),0 16px 32px -18px color-mix(in srgb,var(--accent-dark) 18%,transparent),0 48px 96px -28px color-mix(in srgb,var(--accent) 10%,transparent);
  --shadow-float:inset 0 1px 0 var(--hl),0 14px 32px -14px color-mix(in srgb,var(--accent-dark) 28%,transparent),0 2px 6px -2px color-mix(in srgb,var(--accent-dark) 14%,transparent);
  --shadow-panel:inset 0 1px 0 var(--hl),0 28px 56px -28px color-mix(in srgb,var(--accent) 10%,transparent);
  --tint-violet:#8D87A6;
  --tint-sage:#7D8B76;
  --sky-1:color-mix(in oklab,var(--tint-violet) 38%,var(--bg));
  --sky-2:color-mix(in oklab,var(--tint-violet) 20%,var(--bg));
  --sky-3:color-mix(in oklab,var(--accent) 18%,var(--bg));
  --sky-4:color-mix(in oklab,var(--accent) 27%,var(--bg));
  --mist:color-mix(in oklab,var(--accent) 14%,var(--bg));
  --mtn-far:color-mix(in oklab,color-mix(in oklab,var(--text) 28%,var(--tint-violet)) 46%,var(--bg));
  --mtn-mid:color-mix(in oklab,color-mix(in oklab,var(--text) 40%,var(--accent)) 50%,var(--bg));
  --mtn-near:color-mix(in oklab,color-mix(in oklab,var(--text) 52%,var(--tint-sage)) 66%,var(--bg));
  --water-1:color-mix(in oklab,var(--tint-violet) 24%,var(--bg));
  --water-2:color-mix(in oklab,color-mix(in oklab,var(--text) 40%,var(--tint-violet)) 46%,var(--bg));
  --glow:color-mix(in oklab,var(--accent) 44%,var(--bg-panel));
  --fog:color-mix(in oklab,var(--accent) 16%,var(--bg-panel));
  --flag-red:#C9443C;
  --flag-white:#FBFBF8;
  --flag-blue:#3A4778;
  --flag-green:#3C8558;
  --flag-gold:#E2B33C;
  --flag-black:#22231F;
  --dot-1:color-mix(in oklab,var(--error) 74%,var(--bg-panel));
  --dot-2:color-mix(in oklab,var(--warn) 70%,var(--bg-panel));
  --dot-3:color-mix(in oklab,var(--success) 72%,var(--bg-panel));
  --win-x:7.667%;
  --win-w:68.333%;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,p,ul,ol,blockquote,figure,pre{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.45vw,64px);font-weight:var(--weight-normal);line-height:1.1;letter-spacing:-.02em;margin-bottom:14px}
h2{font-size:32px;font-weight:var(--weight-normal);line-height:1.3;letter-spacing:-.02em}
h3{font-size:18px;line-height:1.45;font-weight:var(--weight-strong)}
a{color:var(--accent-dark);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
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}
button,a,summary{touch-action:manipulation}
button{border:0}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--r-xs)}
::selection{color:var(--text);background:var(--bg-panel-2)}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{margin-bottom:28px;max-width:760px}
.section-head p{margin-top:12px;color:var(--text-muted)}
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*{min-width:0}
.stack{display:flex;flex-direction:column;gap:16px}
.inline-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.mono,code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:18px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-sm);font-size:13px}
pre code{white-space:pre;overflow-wrap:normal}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:18px;height:18px;display:inline-block;vertical-align:middle;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.card,.panel{padding:24px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel);min-width:0}
.panel-inset{background:var(--bg-panel-2);box-shadow:inset 0 1px 0 var(--hl)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 22px;border:1px solid var(--transparent);border-radius:var(--r-md);font-size:16px;font-weight:var(--weight-medium);line-height:24px;white-space:nowrap;flex-shrink:0;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease}
.btn svg{width:16px;height:16px;flex:none}
.btn:hover{text-decoration:none}
.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent),var(--accent-deep));box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 30%,transparent),inset 0 -1px 0 color-mix(in srgb,var(--accent-dark) 60%,transparent),0 1px 2px color-mix(in srgb,var(--accent-dark) 30%,transparent),0 12px 26px -10px color-mix(in srgb,var(--accent) 50%,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 2px 4px color-mix(in srgb,var(--accent-dark) 28%,transparent),0 18px 32px -12px color-mix(in srgb,var(--accent) 56%,transparent)}
.btn:active,.btn.is-pressed{transform:translateY(1px)}
.btn-quiet,.btn-secondary{color:var(--text);background:var(--bg-panel-2);border-color:var(--border);box-shadow:inset 0 1px 0 var(--hl)}
.btn-quiet:hover,.btn-secondary:hover{background:color-mix(in oklab,var(--bg-panel-2) 60%,var(--bg-panel))}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none;box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-small{min-height:36px;font-size:14px;padding:5px 14px}
.site-head,#site-header{position:relative;z-index:50}
.head-row{min-height:var(--head-height);display:flex;align-items:center;gap:20px;flex-wrap:nowrap;position:relative;z-index:53;background:var(--bg)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--text);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{width:28px;height:28px;flex:none}
.brand-en{font-size:17px;font-weight:var(--weight-strong);letter-spacing:-.01em}
.brand-zh{font-size:14px;font-weight:var(--weight-normal);color:var(--text-muted)}
.nav{margin-inline:auto;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.nav a{display:flex;align-items:center;gap:6px;min-height:34px;padding:5px 10px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted);white-space:nowrap;text-decoration:none;transition:color .2s ease,background-color .2s ease}
.nav a svg{width:16px;height:16px;flex:none}
.nav a:hover{color:var(--text);background:color-mix(in oklab,var(--bg-panel-2) 70%,transparent)}
.nav a[aria-current="page"]{color:var(--text);background:var(--bg-panel-2)}
.head-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{appearance:none;border:0;background:var(--transparent);display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;min-width:24px;width:auto;padding:5px 8px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-panel{display:none;position:absolute;z-index:60;top:calc(100% + 8px);right:0;min-width:176px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-float)}
.language.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;color:var(--text);border-radius:var(--r-xs);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;padding:5px 14px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);font-size:14px;font-weight:var(--weight-medium);color:var(--text);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl),0 1px 2px color-mix(in srgb,var(--accent-dark) 8%,transparent)}
.login svg{width:15px;height:15px}
.login:hover{text-decoration:none;background:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-sm);color:var(--text)}
.menu-toggle svg{width:20px;height:20px}
.menu-drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:linear-gradient(180deg,var(--bg-panel-2),var(--bg));padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:330px;margin-top:18px;color:var(--text-muted);font-size:14px;line-height:1.8}
.footer-title{font-size:14px;font-weight:var(--weight-strong);margin-bottom:12px;color:var(--text)}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted);font-size:14px}
.footer-langs{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-langs a{min-height:28px;display:inline-flex;align-items:center;color:var(--text-muted);font-size:13px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{color:var(--text-muted);min-height:24px}
.prose{max-width:800px;min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol{margin-top:16px;line-height:1.9}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:28px}
.prose ul,.prose ol{padding-left:24px}
.prose pre{margin-block:24px}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:160px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.decoration-host,.stage{position:relative;overflow-x:clip;max-width:100%}
@media(min-width:1025px){
  html:not([lang^="zh"]) .nav a{font-size:12px;padding-inline:6px;gap:4px}
  html:not([lang^="zh"]) .head-row{gap:12px}
}
@media(max-width:1180px){.brand-zh{display:none}.head-row{gap:12px}.nav a{padding-inline:7px;font-size:13px}}
@media(max-width:1024px){
  .nav{display:none}
  .head-tools{margin-left:auto;gap:6px}
  .menu-toggle{display:inline-flex}
  .menu-drawer{position:fixed;z-index:52;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--bg-panel);border-top:1px solid var(--border)}
  .menu-drawer.is-open{display:block}
  .menu-drawer ul{list-style:none;margin:0;padding:0}
  .menu-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px;color:var(--text);border-radius:var(--r-sm);text-decoration:none}
  .menu-drawer a svg{width:18px;height:18px}
  .menu-drawer a:hover,.menu-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
  .drawer-langs{border-top:1px solid var(--border);margin-top:16px;padding-top:12px}
  .menu-veil{position:fixed;z-index:51;inset:var(--head-height) 0 0;background:var(--veil)}
  .menu-veil.is-open{display:block}
}
@media(max-width:768px){
  h1{font-size:40px;line-height:1.15}
  h2{font-size:27px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-3{grid-template-columns:1fr}
  .grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:28px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decoration-host,.stage{max-width:100%}
  .head-row{gap:8px}
  .brand{gap:7px}
  .brand-en{font-size:15px}
  .brand-mark{width:25px;height:25px}
  .head-tools{gap:4px;margin-left:auto}
  .lang{font-size:12px;padding-inline:4px;gap:4px}
  .lang svg{width:14px;height:14px}
  .login{padding-inline:9px;font-size:13px}
  .login svg{display:none}
  .menu-toggle{background:var(--transparent);border-color:var(--transparent)}
  .card,.panel{padding:20px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){.lang>svg{display:none}.brand-en{font-size:14px}.head-row{gap:4px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}