:root{
  color-scheme:light;
  --bg:#F6F0E5;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#EEE6D8;
  --border:#E2D8C7;
  --accent:#E5672F;
  --accent-soft:#EF8A55;
  --accent-dark:#B44718;
  --text:#221A14;
  --text-hover:#3A2E25;
  --text-muted:#6E6257;
  --text-soft:#85786B;
  --success:#2F8A4E;
  --warn:#C98A12;
  --error:#C23A2B;
  --hero-top:#FBF7EF;
  --hero-bottom:#F1E9DB;
  --stage-low:#F7F0E5;
  --on-dark:#FFFCF6;
  --transparent:transparent;
  --hairline:rgba(34,26,20,.08);
  --tray-edge:rgba(34,26,20,.045);
  --border-soft:rgba(34,26,20,.07);
  --hi-line:rgba(255,255,255,.8);
  --hi-soft:rgba(255,255,255,.16);
  --ink-06:rgba(34,26,20,.06);
  --ink-10:rgba(34,26,20,.10);
  --ink-30:rgba(34,26,20,.30);
  --veil:rgba(34,26,20,.35);
  --accent-10:rgba(229,103,47,.10);
  --accent-14:rgba(229,103,47,.14);
  --accent-22:rgba(229,103,47,.22);
  --gloss:rgba(255,255,255,.92);
  --gloss-soft:rgba(255,255,255,.36);
  --gloss-ring:rgba(255,255,255,.24);
  --g-grey-hi:#FFFFFF;
  --g-grey-mid:#E4DED5;
  --g-grey-lo:#B2A899;
  --g-grey-deep:rgba(112,100,86,.40);
  --g-grey-tint:rgba(130,116,100,.34);
  --g-sand-hi:#FBF0DD;
  --g-sand-mid:#E0C5A0;
  --g-sand-lo:#AE8A62;
  --g-sand-deep:rgba(132,98,58,.42);
  --g-sand-tint:rgba(176,136,88,.36);
  --g-orange-hi:#FFC896;
  --g-orange-mid:var(--accent);
  --g-orange-lo:var(--accent-dark);
  --g-orange-deep:rgba(140,48,12,.50);
  --g-orange-tint:rgba(229,103,47,.42);
  --g-clay-hi:#F1C9B1;
  --g-clay-mid:#BD7656;
  --g-clay-lo:#7A422E;
  --g-clay-deep:rgba(84,40,24,.48);
  --g-clay-tint:rgba(156,86,58,.38);
  --g-apricot-hi:#FFEAD1;
  --g-apricot-mid:#EDBF95;
  --g-apricot-lo:#BF895D;
  --g-apricot-deep:rgba(156,106,62,.40);
  --g-apricot-tint:rgba(198,138,88,.34);
  --flag-red:#CF3B2E;
  --flag-white:#FFFDF9;
  --flag-blue:#2F3F6E;
  --flag-green:#2F8A4E;
  --flag-edge:rgba(34,26,20,.16);
  --radius-pill:999px;
  --radius-tray:32px;
  --radius-stage:24px;
  --radius-cell:18px;
  --radius-mobile-tray:26px;
  --radius-line:2px;
  --radius-round:50%;
  --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","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-bold:600;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(52px,4.45vw,64px);
  --size-h2:48px;
  --size-h3:24px;
  --gutter:32px;
  --content-width:1296px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --section-space:80px;
  --ease-ui:cubic-bezier(.2,.65,.3,1);
  --shadow-panel:inset 0 1px 0 var(--hi-line),0 24px 64px -20px var(--accent-10);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;color:var(--text);background-color:var(--bg);background-image:linear-gradient(180deg,var(--hero-top) 0,var(--hero-bottom) 880px,var(--bg) 1180px);background-repeat:no-repeat;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit;text-underline-offset:.2em}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
:where(h1,h2,h3,h4,p,ul,ol,figure,blockquote){margin-top:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-medium);text-wrap:balance}
h1{margin:0;font-size:var(--size-h1);line-height:1.1;letter-spacing:-.02em}
h2{margin-bottom:24px;font-size:var(--size-h2);line-height:1.2;letter-spacing:-.02em}
h3{margin-bottom:12px;font-size:var(--size-h3);line-height:1.35;letter-spacing:-.01em}
p{margin-bottom:20px}
strong{font-weight:var(--weight-bold)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--radius-line);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-cell)}
pre code{padding:0;background:var(--transparent);white-space:pre;overflow-wrap:normal}
fieldset{min-width:0}
:where(.shell,.wrap,.grid,.panel,.card,article,section,main)>*{min-width:0}
.shell,.wrap{position:relative;z-index:2;width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{max-width:760px;margin-bottom:36px}
.grid{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card,.panel{min-width:0;padding:32px;border:1px solid var(--border);border-radius:var(--radius-stage);background:var(--bg-panel);box-shadow: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}
.grain{position:fixed;inset:0;width:100%;height:100%;opacity:.03;pointer-events:none;z-index:1;mix-blend-mode:multiply}
.decorated{position:relative;overflow-x:clip;max-width:100%}
.kw{text-decoration-line:underline;text-decoration-color:var(--accent);text-decoration-thickness:.07em;text-underline-offset:.16em;text-decoration-skip-ink:none}
.cta-pair{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:10px 26px;border:0;border-radius:var(--radius-pill);font-family:var(--font-body);font-size:17px;font-weight:var(--weight-medium);line-height:1.4;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color .2s ease,box-shadow .2s ease,color .2s ease}
.btn svg{width:18px;height:18px}
.btn-solid,.btn-primary{background:var(--text);color:var(--on-dark);box-shadow:inset 0 1px 0 var(--hi-soft),0 12px 24px -12px var(--ink-30)}
.btn-solid:hover,.btn-primary:hover,.btn.is-hover{background-color:var(--accent);background-image:linear-gradient(135deg,var(--accent-soft),var(--accent) 45%,var(--accent-dark));box-shadow:inset 0 1px 0 var(--hi-soft),0 14px 28px -12px var(--g-orange-tint)}
.btn-line,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 0 0 1px var(--border),0 1px 2px var(--ink-06)}
.btn-line:hover,.btn-secondary:hover{box-shadow:inset 0 0 0 1px var(--text-soft),0 6px 14px -8px var(--ink-10)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);background-image:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-sm{min-height:44px;padding:9px 22px;font-size:15px}
.reveal{transition:opacity .35s var(--ease-ui),transform .35s var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
#server-status :where(.grid,ul){max-width:100%;min-width:0}
.masthead,#site-header{position:relative;z-index:50}
.mast-row{display:flex;align-items:center;flex-wrap:nowrap;gap:44px;height:var(--header-height);border-bottom:1px solid var(--hairline)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:var(--weight-bold);font-size:19px;letter-spacing:-.01em;white-space:nowrap;flex-shrink:0}
.brand-mark{display:block;width:32px;height:32px;flex:none;filter:drop-shadow(0 6px 10px var(--accent-22))}
.brand-zh{color:var(--text-muted);font-weight:var(--weight-regular)}
.desktop-nav{flex:1;min-width:0;height:100%}
.tabs{display:flex;align-items:center;gap:4px;height:100%;margin:0;padding:0;list-style:none}
.tabs li{height:100%}
.tabs a{position:relative;display:flex;align-items:center;justify-content:center;min-height:44px;height:100%;padding:0 14px;font-size:15px;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color .18s ease}
.tabs a:hover{color:var(--text)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:var(--weight-medium)}
.tabs a[aria-current="page"]::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:var(--radius-line);background:var(--text)}
.mast-tools{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:auto;min-width:44px;height:38px;padding:0 14px;border:0;border-radius:var(--radius-pill);background:var(--transparent);color:var(--text-muted);font-family:var(--font-body);font-size:14px;box-shadow:inset 0 0 0 1px var(--border)}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text);background:var(--bg-panel)}
.lang-panel{position:absolute;top:calc(100% + 10px);right:0;z-index:70;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-cell);box-shadow:0 20px 50px var(--ink-10)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:var(--radius-pill);text-decoration:none;font-size:14px}
.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;min-height:38px;padding:7px 20px;border-radius:var(--radius-pill);background:var(--text);color:var(--on-dark);font-size:14px;font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-soft),0 8px 18px -10px var(--ink-30)}
.login:hover{background:var(--text-hover)}
.burger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--radius-pill);background:var(--bg-panel);color:var(--text)}
.burger-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--radius-line)}
.burger[aria-expanded="true"] .burger-line:first-child{transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] .burger-line:nth-child(2){opacity:0}
.burger[aria-expanded="true"] .burger-line:last-child{transform:translateY(-7px) rotate(-45deg)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:49;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-bottom:1px solid var(--border);text-decoration:none}
.mobile-drawer a[aria-current]{background:var(--bg-panel-2)}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
html.nav-open{overflow:hidden}
.site-footer{position:relative;z-index:2;margin-top:40px;padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--bg-panel-2)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1fr);gap:48px}
.footer-brand p{max-width:350px;margin-top:20px;color:var(--text-muted)}
.footer-title{margin-bottom:14px;font-size:16px;font-weight:var(--weight-medium)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;margin:0;padding:0;list-style:none}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:30px;font-size:14px;color:var(--text-muted);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:36px;padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:20px;font-size:13px;color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.prose{max-width:820px;overflow-wrap:break-word}
.prose h2{margin-top:48px;font-size:32px}
.prose h3{margin-top:32px}
.prose li{margin-block:8px}
.prose :where(img,video){max-width:100%}
@media(max-width:1240px){
  .mast-row{gap:24px}
  .tabs a{padding-inline:10px;font-size:14px}
  .mast-tools{gap:8px}
}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .burger{display:flex}
  .mast-row{gap:20px}
  .mast-tools{margin-left:auto}
}
@media(min-width:1101px){.mobile-drawer{display:none}}
@media(max-width:768px){
  :root{--size-h1:40px;--size-h2:34px;--section-space:56px}
  h1{line-height:1.15}
  .grid-three{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .grid-two,.grid-three{grid-template-columns:minmax(0,1fr)}
  .card,.panel{padding:24px}
  .mast-row{gap:10px}
  .brand{font-size:17px;gap:7px}
  .brand-mark{width:28px;height:28px}
  .lang{padding-inline:10px}
  .lang span{display:none}
  .mast-tools{gap:6px;margin-left:auto}
  .login{padding-inline:14px}
  .decorated{max-width:100%}
  .tilt,.decorative-tilt,[data-tilt]{transform:none}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-brand{grid-column:auto}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:15px}
  .mast-tools{gap:4px}
  .login{padding-inline:11px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}