:root{
  --bg:#F6EEDE;
  --bg-top:#FBF6EC;
  --bg-bottom:#F1E7D4;
  --bg-panel:#FFFBF3;
  --bg-panel-2:#EFE5D2;
  --border:#E2D6C0;
  --accent:#1F5F66;
  --accent-dark:#16464B;
  --accent-plate:#22646B;
  --text:#2A2118;
  --text-hover:#3D3226;
  --text-muted:#6B5E4E;
  --ink-quiet:#857764;
  --success:#2F7D4F;
  --warn:#B7741F;
  --error:#B3412E;
  --notice:#E6EEEA;
  --notice-edge:rgba(31,95,102,.10);
  --hairline:rgba(42,33,24,.07);
  --line-ink:rgba(42,33,24,.26);
  --ink-shadow:rgba(42,33,24,.32);
  --accent-08:rgba(31,95,102,.08);
  --accent-12:rgba(31,95,102,.12);
  --accent-24:rgba(31,95,102,.24);
  --accent-glow:rgba(132,190,186,.30);
  --plate-spark:rgba(255,251,243,.10);
  --on-accent:#FFFBF3;
  --on-accent-muted:rgba(255,251,243,.72);
  --glass:rgba(255,251,243,.10);
  --glass-strong:rgba(255,251,243,.19);
  --glass-cell:rgba(255,251,243,.08);
  --glass-on:rgba(255,251,243,.18);
  --glass-line:rgba(255,251,243,.14);
  --glass-edge:rgba(255,255,255,.26);
  --glass-hi:rgba(255,255,255,.42);
  --glass-sheen:rgba(255,255,255,.10);
  --hl-18:rgba(255,255,255,.18);
  --shadow-teal:rgba(8,34,38,.55);
  --float-bg:rgba(255,251,243,.84);
  --float-edge:rgba(255,255,255,.70);
  --veil:rgba(42,33,24,.32);
  --transparent:transparent;
  --mask-solid:#000;
  --flag-red:#C8443A;
  --flag-navy:#2D3F6A;
  --flag-gold:#D8A73C;
  --flag-black:#2A2118;
  --flag-paper:#FFFBF3;
  --flag-edge:rgba(42,33,24,.14);
  --r-btn:8px;
  --r-plate:28px;
  --r-card:16px;
  --r-cell:10px;
  --r-tag:6px;
  --r-code:4px;
  --r-logo:9px;
  --r-pill:999px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --fs-body:16px;
  --fs-small:14px;
  --fs-h1:64px;
  --fs-h2:40px;
  --fs-h3:24px;
  --fw-normal:400;
  --fw-medium:500;
  --fw-bold:600;
  --gutter:40px;
  --page-width:1200px;
  --header-height:64px;
  --toc-height:64px;
  --anchor-offset:88px;
  --ease-out:cubic-bezier(.2,.65,.3,1);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='g' color-interpolation-filters='sRGB'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .165 0 0 0 0 .129 0 0 0 0 .094 .1 0 0 0 -.02'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;color:var(--text);background:var(--grain),var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent-dark)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-btn)}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
h1,h2,h3,h4,p{overflow-wrap:break-word}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--fw-normal);text-wrap:balance}
h1{margin:18px 0 0;font-size:var(--fs-h1);line-height:1.1;letter-spacing:-.03em}
h2{margin:0 0 24px;font-size:var(--fs-h2);line-height:1.2;letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:var(--fs-h3);line-height:1.35}
p{margin:0 0 20px}
strong{font-weight:var(--fw-bold)}
ul,ol{padding-left:1.4em}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-cell);background:var(--bg-panel-2)}
code,kbd{font-family:var(--font-mono);overflow-wrap:anywhere}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{text-align:left}
button{border:0;background:var(--transparent)}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{margin-bottom:32px;max-width:800px}
.section-head p,.muted{color:var(--text-muted)}
.no-break{white-space:nowrap}
.kw,.text-link{color:var(--accent)}
.text-link{display:inline-flex;align-items:center;min-height:24px;text-decoration:underline;text-underline-offset:4px}
.mono{font-family:var(--font-mono)}
.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))}
.stack{display:grid;gap:20px;min-width:0}
.card,.panel{min-width:0;padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:0 8px 30px -20px var(--accent-12)}
.panel-sunken{background:var(--bg-panel-2)}
.panel-accent{background:var(--accent);color:var(--on-accent);border-color:var(--accent);border-radius:var(--r-plate);box-shadow:0 24px 64px var(--accent-12)}
.actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 28px;border:1px solid var(--transparent);border-radius:var(--r-btn);font-size:16px;font-weight:var(--fw-medium);line-height:1.2;white-space:nowrap;flex-shrink:0;transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease}
.btn-solid,.btn-primary{background:var(--text);color:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl-18),0 10px 22px -10px var(--ink-shadow)}
.btn-solid:hover,.btn-primary:hover,.btn-solid.is-hover{background:var(--text-hover);color:var(--bg-panel)}
.btn-line,.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--line-ink)}
.btn-line:hover,.btn-secondary:hover{border-color:var(--text);color:var(--text)}
.btn:active{box-shadow:inset 0 2px 4px var(--accent-12)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-small{min-height:38px;padding-inline:16px;font-size:var(--fs-small)}
.notice{background:var(--notice);border-bottom:1px solid var(--notice-edge);color:var(--text);font-size:14px;line-height:20px;padding:10px 24px;text-align:center}
.notice p{margin:0}
.notice a{display:inline-flex;align-items:center;gap:6px;min-height:24px;margin-left:10px;color:var(--accent);font-weight:var(--fw-medium)}
.notice a:hover{color:var(--accent-dark)}
.notice .arrow{color:var(--warn);transition:transform .2s ease}
.notice a:hover .arrow{transform:translateX(2px)}
.top{background:var(--grain),linear-gradient(180deg,var(--bg-top) 0%,var(--bg-bottom) 100%);overflow-x:clip;max-width:100%}
.site-header{position:relative;z-index:50;border-bottom:1px solid var(--hairline)}
.header-inner{display:flex;align-items:center;gap:44px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand-mark{width:32px;height:32px;border-radius:var(--r-logo);flex:none}
.brand-name{font-family:var(--font-display);font-size:18px;font-weight:var(--fw-bold);letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.brand-zh{font-weight:var(--fw-normal);color:var(--text-muted)}
.nav{display:flex;align-items:center;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:28px}
.nav a{display:inline-flex;align-items:center;min-height:44px;font-size:15px;color:var(--text-muted);font-weight:var(--fw-normal);white-space:nowrap;transition:color .2s ease}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:var(--fw-bold)}
.header-end{margin-left:auto;display:flex;align-items:center;gap:20px;flex-shrink:0}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:14px;color:var(--text-muted);min-width:44px;min-height:44px;width:auto;padding:0}
.lang svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.4}
.lang-text{white-space:nowrap}
.lang:hover{color:var(--text)}
.language-panel{position:absolute;top:calc(100% + 8px);right:0;z-index:80;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-cell);box-shadow:0 16px 36px var(--accent-12)}
.language-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-tag)}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--bg-panel-2);color:var(--accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:var(--r-btn);background:var(--text);color:var(--bg-panel);font-size:14px;font-weight:var(--fw-medium);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-18);transition:background-color .2s ease}
.btn-login:hover{background:var(--text-hover);color:var(--bg-panel)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;border:1px solid var(--border);border-radius:var(--r-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none;position:fixed;inset-inline:0;top:var(--drawer-top,var(--header-height));height:calc(100dvh - var(--drawer-top,var(--header-height)));max-height:calc(100dvh - var(--drawer-top,var(--header-height)));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);z-index:48;padding:16px var(--gutter) 32px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{color:var(--accent);font-weight:var(--fw-bold)}
.drawer-languages{display:grid;margin-top:24px}
.menu-veil{display:none;position:fixed;inset:var(--drawer-top,var(--header-height)) 0 0;background:var(--veil);z-index:47}
.site-footer{margin-top:48px;padding-top:56px;padding-bottom:32px;background:var(--bg-panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;max-width:340px;color:var(--text-muted)}
.footer-title{font-size:16px;font-weight:var(--fw-medium);margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 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;font-size:14px}
.footer-languages{display:flex;gap:12px 24px;flex-wrap:wrap;margin-top:32px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;border-top:1px solid var(--border);padding-top:24px;margin-top:24px;font-size:14px;color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.prose{min-width:0;max-width:800px}
.prose h2{margin-top:56px;font-size:32px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose a{text-decoration:underline;text-underline-offset:3px;color:var(--accent)}
.prose section{min-width:0}
.reveal{transition:opacity .35s var(--ease-out),transform .35s var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;width:100%;max-width:100%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
#server-status :where(.grid,[class*="grid"]){min-width:0;max-width:100%}
.decor-zone{position:relative;overflow-x:clip;max-width:100%}
.decor-glow{position:absolute;inset:12% 8%;border-radius:var(--r-round);background:radial-gradient(ellipse,var(--accent-glow),var(--transparent) 70%);pointer-events:none}
@media(min-width:1081px) and (max-width:1279px){
  .header-inner{gap:24px}
  .nav ul{gap:18px}
  .header-end{gap:12px}
}
@media(max-width:1080px){
  .nav{display:none}
  .header-end{margin-left:auto;gap:12px}
  .menu-toggle{display:inline-flex}
  html.nav-open .mobile-drawer,html.nav-open .menu-veil{display:block}
  .footer-grid{grid-template-columns:1.2fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px;--fs-h1:40px;--fs-h2:32px}
  h1{line-height:1.15}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .header-inner{gap:16px}
  .notice{font-size:13px;padding:9px 16px}
  .footer-grid{gap:28px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.gcard{transform:none}
  .decor-zone,.decor-glow{max-width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .card,.panel{padding:24px}
  .lang-text{display:none}
}
@media(max-width:360px){
  :root{--gutter:16px;--fs-h1:36px}
  .header-inner{gap:8px}
  .header-end{gap:4px}
  .brand{gap:6px}
  .brand-name{font-size:16px}
  .brand-mark{width:28px;height:28px}
  .btn-login{padding-inline:12px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}