:root {
  color-scheme: light;
  --bg:#F8F0E2;
  --bg-top:#FCF7EE;
  --bg-bottom:#F2E8D6;
  --panel:#FFFBF4;
  --panel-2:#F0E5D2;
  --panel-2-hi:#F6EDDF;
  --panel-rail:#F9F2E7;
  --white:#FFFFFF;
  --border:#E3D5BE;
  --border-strong:#CDB998;
  --line-soft:#EEE3D1;
  --accent:#12855A;
  --accent-dark:#0B5E3F;
  --accent-2:#3AA76D;
  --accent-tint:#DCEFE3;
  --text:#2B2117;
  --muted:#6E5E4C;
  --faint:#9C8B74;
  --warn:#D98A12;
  --amber-tint:#FAE7C4;
  --amber-ink:#8A5507;
  --sky:#3B8BCB;
  --sky-tint:#DBEAF6;
  --sky-ink:#22598A;
  --rose:#D45A7E;
  --rose-tint:#F7DFE6;
  --rose-ink:#953356;
  --error:#C8402F;
  --accent-a08:rgba(18,133,90,.08);
  --accent-a12:rgba(18,133,90,.12);
  --accent-a16:rgba(18,133,90,.16);
  --accent-a22:rgba(18,133,90,.22);
  --accent-a35:rgba(18,133,90,.35);
  --accent-a45:rgba(18,133,90,.45);
  --amber-a35:rgba(217,138,18,.35);
  --ink-a06:rgba(43,33,23,.06);
  --ink-a10:rgba(43,33,23,.10);
  --ink-a14:rgba(43,33,23,.14);
  --veil:rgba(43,33,23,.36);
  --hi:rgba(255,255,255,.9);
  --hi-a30:rgba(255,255,255,.30);
  --flag-red:#D42A2F;
  --flag-blue:#1B3A86;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-tiny:11px;
  --fs-caption:12px;
  --fs-small:13px;
  --fs-meta:13.5px;
  --fs-label:14px;
  --fs-nav:14.5px;
  --fs-chip:15px;
  --fs-body:16px;
  --fs-button:17px;
  --fs-lede:19px;
  --fs-window:20px;
  --fs-h3:24px;
  --fs-h2:32px;
  --fs-section:44px;
  --fs-display:clamp(52px,4.72vw,68px);
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --r-flag:4px;
  --r-xs:6px;
  --r-sm:8px;
  --r-icon:10px;
  --r-md:14px;
  --r-lift:16px;
  --r-lg:18px;
  --r-xl:24px;
  --r-pill:999px;
  --r-round:50%;
  --nav-h:72px;
  --gutter:32px;
  --content-width:1280px;
  --reading-width:840px;
  --section-space:88px;
  --toc-offset:88px;
  --anchor-offset:156px;
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --speed:.2s;
  --reveal-speed:.35s;
  --shadow-card:inset 0 1px 0 var(--hi),0 24px 48px -30px var(--accent-a12);
  --paper-grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cfilter id='paper'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23paper)' d='M0 0h160v160H0z'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--toc-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-regular);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;background-image:var(--paper-grain);opacity:.03;mix-blend-mode:multiply}
main,footer{position:relative}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,summary,a{-webkit-tap-highlight-color:var(--accent-a12)}
button:disabled,[aria-disabled="true"]{cursor:not-allowed}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--font-display);line-height:1.2;text-wrap:balance}
h1{font-size:var(--fs-display);font-weight:var(--weight-display);letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--fs-h2);font-weight:var(--weight-display)}
h3{font-size:var(--fs-h3);font-weight:var(--weight-bold)}
p{margin-block:0 1.25em}
ul,ol{padding-inline-start:1.5em}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-title{margin:0;font-size:var(--fs-section);font-weight:var(--weight-display);line-height:1.15;letter-spacing:var(--tracking-display);text-align:center}
.section-intro{max-width:42em;margin:20px auto 32px;text-align:center;color:var(--muted)}
.grid{display:grid;gap:24px}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*,[class*="__grid"]>*{min-width:0}
.card,.panel{min-width:0;padding:28px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-xl);box-shadow:var(--shadow-card)}
.panel--tray{background:var(--panel-2)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.prose{min-width:0;line-height:1.85}
.prose h2{margin-block:2em .75em}
.prose h3{margin-block:1.6em .6em}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
.decorated-section{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:80px;overflow:hidden;margin-block:24px 32px}
#server-status+*{margin-top:32px}
.reveal{transition:opacity var(--reveal-speed) var(--ease-out),transform var(--reveal-speed) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:56px;max-width:100%;padding:0 28px;border:0;border-radius:var(--r-pill);font-size:var(--fs-button);font-weight:var(--weight-bold);letter-spacing:-.005em;white-space:nowrap;flex-shrink:0;transition:transform var(--speed) ease,box-shadow var(--speed) ease,background-color var(--speed) ease}
.btn--go,.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent-2) -60%,var(--accent) 50%,var(--accent-dark) 150%);box-shadow:inset 0 1px 0 var(--hi-a30),0 16px 30px -14px var(--accent-a45),0 2px 6px var(--accent-a16)}
.btn--go svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;transition:transform var(--speed) ease}
.btn--go:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hi-a30),0 20px 34px -14px var(--accent-a45),0 2px 6px var(--accent-a16)}
.btn--go:hover svg{transform:translateX(3px)}
.btn--go:active,.btn-primary:active{transform:translateY(1px)}
.btn--ghost,.btn-secondary{color:var(--text);background:var(--clear);border:1.5px solid var(--border-strong);padding-inline:26px}
.btn--ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;transform:none;border:1px solid var(--border)}
.topbar{position:relative;z-index:50}
.topbar__inner{height:var(--nav-h);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand__mark{width:36px;height:36px;flex:none;filter:drop-shadow(0 6px 10px var(--accent-a22))}
.brand__en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--fs-lede);letter-spacing:-.02em;color:var(--text)}
.brand__zh{font-size:var(--fs-label);font-weight:var(--weight-medium);color:var(--muted);padding-left:10px;border-left:1px solid var(--border);white-space:nowrap}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:0}
.mainnav li{display:flex;align-items:center;min-width:0}
.mainnav li+li::before{content:"·";color:var(--faint);font-weight:var(--weight-bold);margin-inline:2px}
.mainnav a{display:block;padding:7px 12px;border-radius:var(--r-pill);font-size:var(--fs-nav);font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:background-color var(--speed) ease,color var(--speed) ease}
.mainnav a:hover{color:var(--text);background:var(--panel-2)}
.mainnav a.is-active{background:var(--accent-tint);color:var(--accent-dark);font-weight:var(--weight-semibold)}
.topbar__end{display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:38px;padding-inline:12px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:var(--fs-label);color:var(--muted);white-space:nowrap;cursor:pointer;list-style:none}
.lang::-webkit-details-marker{display:none}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.6}
.lang__caret{font-size:var(--fs-tiny)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;width:184px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-label)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding-inline:20px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-nav);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-a30),0 8px 16px -10px var(--ink-a14);transition:background-color var(--speed) ease}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;background:var(--clear);border:1px solid var(--border);border-radius:var(--r-icon);color:var(--text)}
.menu-toggle svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:24px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-heading{font-size:var(--fs-chip);font-weight:var(--weight-bold);margin:0 0 16px}
.footer-copy{max-width:27em;margin-top:18px;color:var(--muted);font-size:var(--fs-label)}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-label);color:var(--muted)}
.footer-links a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;padding-block:24px;border-bottom:1px solid var(--border);margin-top:24px}
.footer-languages a{min-height:28px;display:inline-flex;align-items:center;font-size:var(--fs-label);color:var(--muted)}
.footer-languages a[aria-current="true"]{color:var(--text);font-weight:var(--weight-bold)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-top:20px;font-size:var(--fs-small);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
@media(max-width:1240px){
  .mainnav a{padding-inline:9px}
  .topbar__inner{gap:16px}
}
@media(max-width:1180px){
  .mainnav{display:none}
  .topbar__end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--nav-h);left:0;right:0;z-index:48;height:calc(100dvh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--border)}
  .mobile-drawer.is-open{display:block}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm);font-size:var(--fs-body)}
  .mobile-drawer a:hover,.mobile-drawer a.is-active{background:var(--panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
  .nav-veil{position:fixed;inset:var(--nav-h) 0 0;z-index:47;background:var(--veil);border:0}
  .nav-veil.is-open{display:block}
}
@media(max-width:768px){
  :root{--gutter:16px;--section-space:56px;--fs-section:32px;--fs-h2:28px;--fs-display:clamp(28px,9.2vw,40px)}
  .brand__zh{display:none}
  .topbar__inner{gap:8px}
  .topbar__end{gap:6px;margin-left:auto}
  .lang{padding-inline:8px;font-size:var(--fs-small)}
  .login{padding-inline:16px;font-size:var(--fs-label)}
  .btn{height:52px;font-size:var(--fs-body);padding-inline:24px}
  .grid--three{grid-template-columns:1fr}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .card,.panel{padding:22px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.stage__tray,.win,.lift{transform:none}
  .decorated-section{max-width:100%;overflow-x:clip}
}
@media(max-width:360px){
  .brand{gap:6px}
  .brand__mark{width:28px;height:28px}
  .brand__en{font-size:var(--fs-chip)}
  .login{padding-inline:12px}
  .lang{padding-inline:4px;font-size:var(--fs-caption)}
  .topbar__end{gap:4px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}