:root {
  color-scheme: light;
  --bg:#F8F1E6;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#EFE6D6;
  --border:#E2D6C2;
  --accent:#B8366A;
  --accent-dark:#85224B;
  --accent-soft:#E07A9B;
  --text:#2A211B;
  --text-muted:#6E6255;
  --success:#3E7D4F;
  --warn:#B7791F;
  --error:#B23A2C;
  --cocoa:#2B221D;
  --paper-top:#FCF8F0;
  --paper-bottom:#F1E8D9;
  --grid-line:rgba(42,33,27,.03);
  --glow-rose:rgba(224,122,155,.17);
  --tint-6:rgba(184,54,106,.06);
  --tint-10:rgba(184,54,106,.10);
  --tint-14:rgba(184,54,106,.14);
  --shade-8:rgba(42,33,27,.08);
  --shade-16:rgba(42,33,27,.16);
  --shade-28:rgba(42,33,27,.28);
  --veil-color:rgba(42,33,27,.38);
  --hi-line:rgba(255,255,255,.78);
  --hi-soft:rgba(255,255,255,.14);
  --glass:rgba(255,255,255,.5);
  --glass-faint:rgba(255,255,255,.12);
  --bezel:#16120F;
  --bezel-2:#302A26;
  --alu-1:#F4F2EE;
  --alu-2:#DDD9D2;
  --alu-3:#C2BCB3;
  --alu-4:#A69F96;
  --key-top:#FEFDFB;
  --key-face:#F1EEE9;
  --key-side:#CDC7BF;
  --flag-red:#C23B34;
  --flag-white:#FFFCF6;
  --flag-blue:#2E4877;
  --on-dark:#FFFCF6;
  --on-dark-muted:rgba(255,252,246,.7);
  --on-dark-line:rgba(255,252,246,.16);
  --on-dark-hover:rgba(255,252,246,.08);
  --folder-rose:color-mix(in srgb,var(--accent) 62%,var(--bg-panel));
  --folder-amber:color-mix(in srgb,var(--warn) 66%,var(--bg-panel));
  --folder-sage:color-mix(in srgb,var(--success) 62%,var(--bg-panel));
  --folder-stone:color-mix(in srgb,var(--text-muted) 70%,var(--bg-panel));
  --folder-plum:color-mix(in srgb,var(--accent-dark) 58%,var(--bg-panel));
  --selected-bg:color-mix(in srgb,var(--accent-soft) 20%,var(--bg-panel));
  --radius-xs:4px;
  --radius-s:6px;
  --radius-m:10px;
  --radius-l:12px;
  --radius-pill:999px;
  --radius-circle:50%;
  --radius-ipad:34px;
  --radius-screen:22px;
  --radius-phone:32px;
  --radius-phone-screen:25px;
  --radius-keyboard:18px;
  --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","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --font-hand:"Kaiti SC","STKaiti","KaiTi","BiauKai","Noto Serif SC",serif;
  --gutter:48px;
  --wrap-max:1376px;
  --header-height:68px;
  --anchor-offset:88px;
  --toc-offset:148px;
  --shadow-panel:inset 0 1px 0 var(--hi-line),0 20px 60px -24px var(--tint-10);
  --ease-duration:.2s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a{color:inherit;text-decoration:none}
a,button,summary,input,select,textarea{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
p,ul,ol,blockquote,pre{margin-top:0}
p{margin-bottom:1em}
ul,ol{padding-left:1.5em}
h1,h2,h3,h4{font-family:var(--font-display);color:inherit;text-wrap:balance}
h1{font-size:clamp(52px,4.45vw,64px);line-height:1.12;font-weight:900;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:clamp(28px,3vw,40px);line-height:1.2;letter-spacing:-.02em;font-weight:900;margin:0 0 24px}
h3{font-size:22px;line-height:1.35;margin:0 0 16px}
h4{font-size:18px;line-height:1.4;margin:0 0 12px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.88em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--radius-s);font-size:14px}
pre code{overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
::selection{background:var(--selected-bg);color:var(--accent-dark)}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.stack>*+*{margin-top:24px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*,:where(main,section,article,aside,nav,div){min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.small{font-size:14px}
.reading-wrap{max-width:840px;margin-inline:auto}
.prose{font-size:17px;line-height:1.85;overflow-wrap:anywhere}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px;color:var(--accent-dark)}
.prose li+li{margin-top:8px}
.panel,.card{padding:28px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-m);box-shadow:var(--shadow-panel)}
.card h3{margin-bottom:12px}
.card p:last-child,.panel p:last-child{margin-bottom:0}
.decorated{position:relative;overflow-x:clip;isolation:isolate}
.skip{position:absolute;left:16px;top:12px;z-index:100;padding:10px 16px;background:var(--text);color:var(--bg-panel);border-radius:var(--radius-s);font-size:14px;clip-path:inset(50%);width:1px;height:1px;padding:0;overflow:hidden;white-space:nowrap;opacity:0;pointer-events:none}
.skip:focus{clip-path:none;width:auto;height:auto;padding:10px 16px;overflow:visible;opacity:1;pointer-events:auto}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:8px;min-height:48px;padding:0 24px;border:1px solid var(--text);border-radius:var(--radius-s);font:600 15.5px/1.2 var(--font-body);letter-spacing:.01em;white-space:nowrap;transition:background-color var(--ease-duration),border-color var(--ease-duration),color var(--ease-duration)}
.btn svg{width:16px;height:16px}
.btn--solid,.btn-primary{background:var(--text);color:var(--bg-panel);box-shadow:0 12px 26px -14px var(--tint-14),inset 0 1px 0 var(--hi-soft)}
.btn--solid:hover,.btn-primary:hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.btn--line{background:transparent;color:var(--text)}
.btn--line:hover{background:var(--bg-panel)}
.btn--sm{min-height:36px;padding:0 16px;font-size:14px}
.btn--on-dark{border-color:var(--on-dark);color:var(--on-dark);background:transparent}
.btn--on-dark:hover{background:var(--on-dark-hover)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;pointer-events:none}
.btn:active{background:var(--accent-dark);color:var(--on-dark);border-color:var(--accent-dark)}
.topbar{position:relative;z-index:50;background:var(--paper-top);border-bottom:1px solid var(--border)}
.topbar__row{height:var(--header-height);display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font:800 19px/1.2 var(--font-display);letter-spacing:-.02em;color:var(--text)}
.brand__mark{width:34px;height:34px;flex:none;filter:drop-shadow(0 4px 8px var(--tint-14))}
.brand__zh{color:var(--text-muted);font-weight:500}
.mainnav{flex:1;min-width:0;margin-left:auto}
.mainnav__list{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0}
.mainnav__list li{display:flex;align-items:center;flex-shrink:0}
.mainnav__list li+li::before{content:"·";margin:0 14px;color:var(--text-muted);opacity:.55}
.mainnav a{position:relative;display:inline-block;padding:6px 0;font-size:14.5px;line-height:1.6;color:var(--text-muted);white-space:nowrap;transition:color var(--ease-duration)}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:600}
.mainnav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-16px;height:2px;border-radius:var(--radius-xs);background:var(--accent)}
.topbar__tools{display:flex;align-items:center;flex-shrink:0;gap:16px;padding-left:22px;border-left:1px solid var(--border)}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:6px 2px;border:0;background:none;font-size:14px;color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px}
.lang-panel{position:absolute;z-index:80;right:0;top:calc(100% + 12px);min-width:176px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-m);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-s);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--selected-bg);color:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--radius-s);background:var(--bg-panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.mobile-drawer{position:fixed;z-index:70;top:var(--header-height);right:0;width:min(420px,100%);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--bg-panel);border-left:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 12px;font-size:16px;line-height:1.4;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{color:var(--accent-dark);font-weight:700;background:var(--tint-6)}
.drawer-languages{margin-top:20px;padding-top:12px;border-top:1px dashed var(--border)}
.drawer-label{display:block;font:12px/1.5 var(--font-mono);color:var(--text-muted);padding:8px 12px}
.nav-veil{position:fixed;z-index:40;inset:var(--header-height) 0 0;background:var(--veil-color);border:0;width:100%;height:calc(100dvh - var(--header-height))}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:30em;margin:20px 0;color:var(--text-muted);font-size:14px}
.footer-title{font-size:14px;font-weight:700;margin:0 0 16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 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:32px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px dashed var(--border)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font:12px/1.6 var(--font-mono);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity .35s,transform .35s}
.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-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(min-width:1181px) and (max-width:1320px){
  .topbar__row{gap:22px}
  .mainnav__list li+li::before{margin-inline:10px}
  .topbar__tools{gap:12px;padding-left:16px}
}
@media(max-width:1180px){
  .mainnav{display:none}
  .topbar__tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
}
@media(max-width:900px){
  :root{--gutter:28px}
  .grid{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:768px){
  h1{font-size:40px}
  .sec{padding-top:56px;padding-bottom:56px}
  .topbar__row{gap:12px}
  .topbar__tools{gap:10px;padding-left:12px}
  .lang{font-size:12px}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:22px}
  .tilt,[data-tilt]{transform:none}
  .decorated{max-width:100%;overflow-x:clip}
  .brand{font-size:16px;gap:7px}
  .brand__mark{width:28px;height:28px}
  .topbar__row{gap:8px}
  .topbar__tools{gap:6px;padding-left:0;border-left:0}
  .topbar__tools .btn{padding-inline:10px;font-size:13px;min-height:36px}
  .lang{font-size:11px;gap:3px}
  .lang svg{width:12px;height:12px}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .brand{font-size:14px;gap:5px}
  .brand__mark{width:25px;height:25px}
  .topbar__tools{gap:3px}
  .topbar__tools .btn{padding-inline:8px}
  .lang{font-size:10px}
  h1{font-size:36px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}