:root{
  --bg:#F7EDE1;--bg-panel:#FDF8F1;--bg-panel2:#EFE3D2;--border:#E2D3BE;--border-dark:#CDB99D;
  --accent:#B8435A;--accent-dark:#8E3044;--text:#2B1F17;--text-muted:#6E5E50;--success:#3E7A4F;--warn:#B7791F;--error:#B3261E;--paper-white:#FFFDF9;--on-accent:#FFFFFF;
  --hero-top:#F2E4D2;--hero-mid:#F7EDE1;--hero-bot:#FDF8F1;--wall-top:#E8D4BB;--wall-bot:#F0E0CB;--dusk-1:#E5BFAE;--dusk-2:#F0D3B7;--dusk-3:#F9E8D3;--sun:#FCEEDB;
  --wood-edge:#C49B72;--wood-hi:#D7B690;--wood-mid:#E4CBAA;--wood-frame:#D6BC99;--wood-frame-d:#C4A47D;--book-1:#C9A88A;--book-2:#A98C74;--book-3:#DCC7AB;--book-4:#9DA18B;--book-5:#BC8E7E;
  --brass-hi:#EBCF94;--brass-mid:#C89F5A;--brass-lo:#9A7437;--glow:#F6C98F;--alu-hi:#F2E6D4;--alu-mid:#DDC9AB;--alu-lo:#BEA383;--bezel:#30251D;--screen-1:#F4E0CA;--screen-2:#E7C2B3;--globe-line:#B9A182;--land:#E6D2B8;
  --flag-red:#C8363C;--flag-navy:#26346A;--flag-green:#2E8250;--flag-white:#FFFDF9;--mask-solid:#000000;--transparent:#00000000;
  --accent-rgb:184 67 90;--accent-dark-rgb:142 48 68;--ink-rgb:43 31 23;--hi-rgb:255 253 249;--success-rgb:62 122 79;--glow-rgb:246 201 143;--wood-rgb:215 182 144;
  --font-display:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","Source Han Serif CN","Noto Serif JP","Noto Serif KR",Georgia,"Times New Roman",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --radius:6px;--radius-md:8px;--radius-lg:12px;--radius-round:50%;--radius-tag:999px;
  --shadow-paper:0 24px 52px -20px rgb(var(--accent-rgb) / .12),0 6px 16px -8px rgb(var(--accent-dark-rgb) / .10);
  --shadow-lift:0 30px 64px -24px rgb(var(--accent-dark-rgb) / .30),0 10px 22px -12px rgb(var(--accent-rgb) / .14);
  --edge-hi:inset 0 1px 0 rgb(var(--hi-rgb) / .9);
  --gutter:24px;--content-width:1152px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;
  --body-size:16px;--display-size:64px;--heading-size:36px;--small-size:14px;--space-section:80px;
  --motion-fast:.2s;--motion-reveal:.65s;
  --paper-texture:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23p)' d='M0 0h160v160H0z'/%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}
body{margin:0;font-family:var(--font-body);font-size:var(--body-size);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:60;background-image:var(--paper-texture);opacity:.03;mix-blend-mode:multiply;pointer-events:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
a,button,summary{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p,h1,h2,h3,h4,figure{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:400;line-height:1.25;text-wrap:balance}
h1{font-size:clamp(52px,4.5vw,72px);line-height:1.18;letter-spacing:-.02em}
h2{font-size:var(--heading-size)}
h3{font-size:24px}
ul,ol{margin:0;padding-left:1.4em}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{margin-bottom:32px}
.section-head p{color:var(--text-muted);margin-top:16px;max-width:700px}
.panel,.card{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-paper),var(--edge-hi);padding:32px;min-width:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-bottom:24px}
.prose h2{margin-top:48px;margin-bottom:24px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--bg-panel2);border-radius:var(--radius);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--bg-panel2);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{display:inline-flex;align-items:center;min-height:24px;text-decoration:underline;text-underline-offset:4px}
.btn{display:inline-flex;align-items:center;justify-content:center;height:48px;min-width:148px;padding:0 28px;border:0;border-radius:var(--radius);font-size:16px;font-weight:600;letter-spacing:.04em;white-space:nowrap;flex-shrink:0;transition:background var(--motion-fast),box-shadow var(--motion-fast),transform var(--motion-fast)}
.btn-solid,.btn-primary{color:var(--on-accent);background:linear-gradient(180deg,var(--accent),var(--accent-dark) 140%);box-shadow:0 10px 22px -10px rgb(var(--accent-rgb) / .7),inset 0 1px 0 rgb(var(--hi-rgb) / .22)}
.btn-solid:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-line,.btn-secondary{color:var(--accent);background:var(--paper-white);box-shadow:inset 0 0 0 2px var(--accent),0 8px 18px -12px rgb(var(--accent-rgb) / .35)}
.btn-line:hover,.btn-secondary:hover{background:var(--bg-panel);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-small{height:40px;font-size:var(--small-size);min-width:0;padding-inline:18px}
.cta-row{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.topbar{position:relative;z-index:40;height:var(--header-height);background:var(--bg-panel);border-bottom:1px solid var(--border);box-shadow:0 6px 18px -14px rgb(var(--accent-dark-rgb) / .22)}
.topbar-in{max-width:1344px;height:100%;margin:0 auto;padding:0 48px;display:flex;align-items:center}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:30px;height:30px;flex:none;display:block}
.brand-en{font-weight:700;font-size:18px;letter-spacing:.02em}
.brand-zh{font-weight:400;font-size:15px;color:var(--text-muted)}
.mainnav{margin-left:44px}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:26px}
.mainnav a{display:inline-flex;align-items:center;min-height:24px;font-size:15px;white-space:nowrap;padding:6px 0}
.mainnav a:hover{color:var(--text-muted)}
.mainnav a[aria-current="page"]{font-weight:600}
.topbar-end{margin-left:auto;display:flex;align-items:center;gap:18px;flex:none}
.lang-box{position:relative}
.lang,.menu-btn{background:none;border:0;padding:6px 2px;font-size:14px;color:var(--text-muted);white-space:nowrap;min-height:44px;min-width:44px;width:auto}
.menu-btn{display:none}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 18px;border:1px solid var(--text);border-radius:var(--radius);font-size:14px;font-weight:600;background:var(--paper-white);transition:background var(--motion-fast),color var(--motion-fast)}
.login:hover{background:var(--text);color:var(--bg-panel)}
.lang-pop{position:absolute;top:100%;right:0;min-width:180px;background:var(--paper-white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-paper);padding:8px}
.lang-pop a{display:flex;align-items:center;min-height:44px;padding:8px 12px}
.lang-pop a:hover{background:var(--bg-panel2)}
.mobile-drawer{display:none}
html.nav-open{overflow:hidden}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:rgb(var(--ink-rgb) / .25);z-index:30;border:0}
.site-footer{background:var(--bg-panel2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;color:var(--text-muted);max-width:350px}
.footer-title{font-family:var(--font-body);font-size:16px;font-weight:600;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-links a:hover,.footer-legal a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-block:16px;border-block:1px solid var(--border-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:20px;font-size:14px;color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:24px}
.reveal{transition:opacity var(--motion-reveal) ease,transform var(--motion-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.decor-section{position:relative;overflow-x:clip;max-width:100%}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(max-width:1280px){.topbar-in{padding-inline:24px}.mainnav{margin-left:28px}.mainnav ul{gap:18px}.topbar-end{gap:12px}}
@media(max-width:1180px){
  .mainnav{display:none}.menu-btn{display:inline-flex;align-items:center;justify-content:center}
  .topbar-end{margin-left:auto}
  .mobile-drawer:not([hidden]){display:block;position:absolute;top:100%;left:0;right:0;padding:16px var(--gutter);background:var(--bg-panel);border-bottom:1px solid var(--border);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow-paper)}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 16px;border-radius:var(--radius)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel2);font-weight:600}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
}
@media(max-width:768px){
  :root{--header-height:56px;--gutter:20px;--anchor-offset:72px;--toc-offset:132px;--space-section:48px;--heading-size:28px}
  h1{font-size:clamp(28px,7vw,40px)}
  .topbar-in{padding-inline:16px}.brand-zh{display:none}.lang-box{display:none}.topbar-end{gap:10px;margin-left:auto}
  .grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr;gap:32px}.panel,.card{padding:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-section{max-width:100%;overflow-x:clip}
  .btn{min-width:0;padding-inline:22px}.cta-row{gap:12px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}