:root {
  --bg:#F3EEE3;
  --hero-top:#F8F4EB;
  --hero-bottom:#EEE7D9;
  --panel:#E6DCCB;
  --panel-2:#FBF8F1;
  --border:#D6CBB6;
  --accent:#2F4F6F;
  --accent-dark:#1F364D;
  --text:#1E1913;
  --muted:#6B6052;
  --success:#3F7D4E;
  --warn:#B87A1E;
  --error:#A8402F;
  --board:#241E19;
  --board-center:#2E2620;
  --board-edge:#1C1713;
  --board-ink:#EDE5D6;
  --board-muted:rgba(237,229,214,.56);
  --wire:rgba(237,229,214,.34);
  --board-rule:rgba(230,220,203,.20);
  --board-hl:rgba(230,220,203,.34);
  --c-ochre:#C8894A;
  --c-moss:#7E9467;
  --c-slate:#8FA7BF;
  --c-clay:#9A4F45;
  --c-cream:#E3D3A8;
  --flag-red:#BC3B2E;
  --flag-white:#F7F2E7;
  --flag-blue:#253B6E;
  --flag-green:#2E7A4B;
  --flag-edge:rgba(20,14,10,.22);
  --tile-hl:rgba(255,250,240,.46);
  --tile-low:rgba(20,14,10,.22);
  --tile-drop:rgba(12,9,6,.58);
  --tile-drop-soft:rgba(12,9,6,.38);
  --hl-paper:rgba(255,253,248,.82);
  --btn-hl:rgba(255,255,255,.16);
  --tint-10:rgba(47,79,111,.10);
  --tint-12:rgba(47,79,111,.12);
  --accent-shadow:rgba(47,79,111,.36);
  --ink-shadow:rgba(30,25,19,.20);
  --veil:rgba(30,25,19,.36);
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --font-serif:"Iowan Old Style","Palatino Linotype",Georgia,"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --r-lg:24px;
  --r-md:14px;
  --r-sm:4px;
  --r-tiny:2px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:48px;
  --wrap-max:1416px;
  --head-height:72px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --section-offset:164px;
  --size-body:16px;
  --size-small:14px;
  --size-label:11px;
  --size-h1:clamp(52px,4.45vw,64px);
  --size-h2:clamp(28px,3vw,40px);
  --size-h3:22px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --ease-time:.2s;
  --reveal-time:.55s;
  --shadow-paper:inset 0 1px 0 var(--hl-paper),0 20px 48px -24px var(--tint-10);
}
*,*::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;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
ul,dl,dd,p{margin:0;padding:0}
ul{list-style:none}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-bold);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.14;letter-spacing:-.02em}
h2{font-size:var(--size-h2);line-height:1.25}
h3{font-size:var(--size-h3);line-height:1.4}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.no-break{white-space:nowrap}
.sec{padding-top:72px;padding-bottom:72px}
.panel,.card{min-width:0;padding:28px;border-radius:var(--r-lg);background:var(--panel-2);box-shadow:var(--shadow-paper)}
.panel-warm{background:var(--panel)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-3>*{min-width:0}
.stack{display:grid;gap:24px}
.prose{max-width:78ch;min-width:0;overflow-wrap:break-word}
.prose p{margin-block:18px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose :where(ul,ol){padding-left:24px;list-style:initial}
.prose li{margin-block:8px}
.prose a{text-decoration:underline;text-underline-offset:.2em}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.serif{font-family:var(--font-serif)}
.kw{text-decoration-line:underline;text-decoration-color:var(--accent);text-decoration-thickness:4px;text-underline-offset:.17em;text-decoration-skip-ink:none}
.badge{display:inline-flex;align-items:center;gap:10px;padding:6px 16px 6px 12px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel-2);box-shadow:inset 0 1px 0 var(--hl-paper);font-size:13px;letter-spacing:.02em;max-width:100%}
.badge-dot{width:8px;height:8px;border-radius:var(--r-round);background:var(--accent);flex-shrink:0}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding-block:10px;border-radius:var(--r-pill);font-size:var(--size-body);font-weight:var(--weight-semibold);letter-spacing:.01em;flex-shrink:0;white-space:nowrap;transition:background var(--ease-time),color var(--ease-time),box-shadow var(--ease-time)}
.btn-primary{padding-inline:28px 22px;background:var(--accent);color:var(--panel-2);box-shadow:inset 0 1px 0 var(--btn-hl),0 14px 26px -14px var(--accent-shadow)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn svg{width:18px;height:18px;flex-shrink:0}
.btn-ghost,.btn-secondary{padding-inline:26px;border:1.5px solid var(--text);color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn:active,.btn.is-active{box-shadow:inset 0 2px 5px var(--ink-shadow)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel);color:var(--muted);box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.screen,.decor-region{position:relative;overflow-x:clip;max-width:100%}
.screen{background:linear-gradient(180deg,var(--hero-top),var(--hero-bottom))}
.grain{position:absolute;inset:0;width:100%;height:100%;opacity:.04;mix-blend-mode:multiply;pointer-events:none;z-index:0}
.site-head,#site-header{position:relative;z-index:40}
.head-in{height:var(--head-height);display:flex;align-items:center;justify-content:space-between;gap:32px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:32px;height:32px;flex-shrink:0;filter:drop-shadow(0 4px 8px var(--tint-12))}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-bold);font-size:19px;letter-spacing:.02em;color:var(--text)}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.nav{display:flex;align-items:center;margin-left:auto}
.nav-links{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:30px}
.nav-links a{display:inline-flex;align-items:center;min-height:32px;font-size:15px;color:var(--muted);font-weight:var(--weight-normal);transition:color var(--ease-time)}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.nav-tools{display:flex;align-items:center;gap:18px;flex-shrink:0}
.language-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:40px;padding:6px 2px;font-size:var(--size-small);color:var(--muted);white-space:nowrap}
.lang:hover{color:var(--text)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:176px;padding:8px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-paper);z-index:45}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px}
.lang-menu a:hover,.lang-menu a[aria-current]{color:var(--accent);background:var(--panel)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 22px;border-radius:var(--r-pill);background:var(--text);color:var(--panel-2);font-size:var(--size-small);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--btn-hl),0 8px 18px -12px var(--ink-shadow);transition:background var(--ease-time)}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;font-size:var(--size-h3)}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;background:var(--veil);z-index:41}
.site-foot{position:relative;background:var(--panel);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.3fr .8fr;gap:36px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:30ch;margin-top:20px;color:var(--muted)}
.footer-title{font-family:var(--font-mono);font-size:var(--size-label);letter-spacing:.12em;margin:0 0 16px}
.footer-links{display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px;overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:36px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--size-small);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
#server-status{position:relative;display:block;min-height:80px;overflow:hidden;max-width:100%;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
[data-stat]{display:inline-block;font-variant-numeric:tabular-nums;min-width:3ch;text-align:right;font-family:var(--font-mono)}
@media(max-width:1200px){
  .head-in{gap:20px}
  .nav-links{gap:22px}
  .nav-tools{gap:12px}
}
@media(max-width:1100px){
  .nav-links{gap:16px}
  .head-in{gap:16px}
}
@media(max-width:1024px){
  .nav{display:none}
  .nav-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;inset:var(--head-height) 0 auto;background:var(--panel-2);border-top:1px solid var(--border);padding:16px var(--gutter);z-index:43;max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px}
  .mobile-drawer a[aria-current]{color:var(--accent);font-weight:var(--weight-semibold)}
  .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){
  :root{--gutter:20px;--head-height:64px;--anchor-offset:80px;--toc-offset:16px;--section-offset:96px;--size-h1:36px}
  .head-in{gap:12px}
  .sec{padding-top:48px;padding-bottom:48px}
  .grid-3{grid-template-columns:1fr}
  .panel,.card{padding:24px}
  .decor-region{max-width:100%}
  .cta-row{margin-top:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt{transform:none}
  .language-box{display:none}
  .nav-tools{gap:8px;margin-left:auto}
  .login{padding-inline:16px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .brand-word{font-size:18px}
  .decor-region>*{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}