:root{
  color-scheme:light;
  --bg:#FCF3E3;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#F4E9D6;
  --border:#E8DAC2;
  --accent:#D6336C;
  --accent-dark:#A6214F;
  --text:#2A1F17;
  --text-muted:#6E5E50;
  --success:#2E9B5A;
  --warn:#D98A12;
  --error:#C7362B;
  --hero-top:#FFF9EF;
  --hero-bottom:#F5E8D4;
  --sunflower:#F5C842;
  --on-accent:#FFFDF8;
  --flag-red:#D7263D;
  --flag-blue:#22357A;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --accent-rgb:214,51,108;
  --ink-rgb:42,31,23;
  --hl:255,255,255;
  --hero-top-rgb:255,249,239;
  --success-rgb:46,155,90;
  --c-violet:146,116,246;
  --c-violet-d:104,74,222;
  --c-sky:88,190,244;
  --c-sky-d:40,142,224;
  --c-pink:240,112,160;
  --c-pink-d:214,51,108;
  --c-green:96,206,112;
  --c-green-d:46,160,80;
  --c-yellow:248,212,82;
  --c-yellow-d:232,168,30;
  --c-orange:250,160,70;
  --c-orange-d:236,112,34;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","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;
  --fs-xs:12px;
  --fs-sm:14px;
  --fs-body:16px;
  --fs-button:17px;
  --fs-lead:20px;
  --fs-brand:21px;
  --fs-h3:24px;
  --fs-h2:clamp(28px,3.2vw,44px);
  --fs-h1:clamp(52px,4.73vw,68px);
  --fs-hero:68px;
  --fs-hero-mobile:clamp(28px,7.5vw,40px);
  --fs-micro:11px;
  --fs-nav:15px;
  --fs-furniture:13.5px;
  --r-card:28px;
  --r-node:48px;
  --r-tag:20px;
  --r-pill:999px;
  --r-circle:50%;
  --r-sm:12px;
  --r-md:18px;
  --r-menu:22px;
  --gutter:24px;
  --head-h:72px;
  --toc-h:64px;
  --anchor-offset:calc(var(--head-h) + 16px);
  --content-width:1200px;
  --reading-width:800px;
  --shadow-card:0 24px 48px rgba(var(--accent-rgb),.10);
  --shadow-soft:0 10px 28px -8px rgba(var(--ink-rgb),.14);
  --shadow-feature:0 16px 36px rgba(var(--ink-rgb),.08);
  --ease:cubic-bezier(.2,.7,.25,1);
  --speed:.2s;
  --reveal-speed:.35s;
  --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='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Cpath fill='%232A1F17' filter='url(%23p)' opacity='.3' d='M0 0h160v160H0z'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:90;pointer-events:none;background-image:var(--paper-texture);opacity:.1;mix-blend-mode:multiply}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button,a{-webkit-tap-highlight-color:rgba(var(--accent-rgb),.12)}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
::selection{color:var(--on-accent);background:var(--accent-dark)}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:900;line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);font-weight:850;line-height:1.2;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--fs-h3);font-weight:800;line-height:1.3;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel-2);border-radius:var(--r-tag)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.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)}
.sec{padding-top:80px;padding-bottom:80px}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*{min-width:0}
.panel,.card{background:var(--bg-panel);border-radius:var(--r-card);padding:28px;box-shadow:var(--shadow-card);min-width:0}
.panel-inset{background:var(--bg-panel-2);border-radius:var(--r-card);padding:24px;min-width:0}
.lead{font-size:var(--fs-lead);color:var(--text-muted)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.icon{width:20px;height:20px;flex-shrink:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.skip-link{position:fixed;top:8px;left:16px;z-index:120;transform:translateY(-160%);padding:10px 18px;border-radius:var(--r-pill);background:var(--text);color:var(--on-accent)}
.skip-link:focus{transform:none}
.prose{min-width:0}
.prose p,.prose li{overflow-wrap:anywhere}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:12px 34px;border-radius:var(--r-pill);font-family:var(--font-body);font-size:var(--fs-button);font-weight:700;letter-spacing:-.005em;line-height:1.35;text-align:center;flex-shrink:0;white-space:nowrap;transition:transform var(--speed) var(--ease),background var(--speed) var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(160deg,var(--accent),var(--accent-dark));color:var(--on-accent);box-shadow:0 16px 32px -12px rgba(var(--accent-rgb),.6),inset 0 1px 0 rgba(var(--hl),.25)}
.btn-secondary{background:var(--bg-panel-2);color:var(--accent-dark)}
.btn-secondary:hover{background:var(--border)}
.btn-small{min-height:44px;padding:10px 22px;font-size:var(--fs-sm)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
#site-header{position:sticky;top:0;z-index:70;min-height:var(--head-h)}
.site-head{position:relative;z-index:73;height:var(--head-h);display:flex;align-items:center;gap:24px;padding:0 32px;background:rgba(var(--hero-top-rgb),.86);backdrop-filter:blur(14px) saturate(1.2);box-shadow:0 1px 0 rgba(var(--ink-rgb),.05)}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand img{width:34px;height:34px}
.brand-word{font-family:var(--font-display);font-size:var(--fs-brand);font-weight:900;letter-spacing:-.025em}
.brand-zh{font-size:var(--fs-sm);font-weight:500;color:var(--text-muted)}
.nav-main{flex:1;min-width:0}
.nav-main>ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:4px}
.nav-link{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:8px 16px;border-radius:var(--r-pill);font-size:var(--fs-nav);font-weight:600;white-space:nowrap}
.nav-link:hover{background:rgba(var(--ink-rgb),.05)}
.nav-link[aria-current="page"]{background:var(--bg-panel-2)}
.nav-link[aria-current="page"]::before{content:"";width:7px;height:7px;border-radius:var(--r-circle);background:var(--accent);flex-shrink:0}
.nav-more{position:relative}
.nav-more:not([open]) .nav-more-menu{display:none}
.nav-more[open] .nav-more-menu{display:block}
.nav-more summary{list-style:none;cursor:pointer}
.nav-more summary::-webkit-details-marker{display:none}
.caret{font-size:var(--fs-micro);color:var(--text-muted)}
.nav-more-menu{position:absolute;z-index:76;top:calc(100% + 10px);left:50%;transform:translateX(-50%);min-width:210px;margin:0;padding:8px;list-style:none;background:var(--bg-panel);border-radius:var(--r-menu);box-shadow:var(--shadow-card),0 2px 8px rgba(var(--ink-rgb),.06)}
.nav-more-menu a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);font-size:var(--fs-nav);font-weight:600}
.nav-more-menu a:hover,.nav-more-menu a[aria-current="page"]{background:var(--bg-panel-2)}
.head-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-picker{position:relative}
.lang-switch{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;width:auto;padding:8px 14px;background:var(--clear);border-radius:var(--r-pill);font-size:var(--fs-sm);font-weight:600;color:var(--text-muted);white-space:nowrap}
.lang-switch span{white-space:nowrap}
.lang-switch:hover{background:rgba(var(--ink-rgb),.05)}
.lang-switch svg{width:16px;height:16px}
.lang-panel{position:absolute;z-index:80;right:0;top:calc(100% + 10px);min-width:180px;padding:8px;background:var(--bg-panel);border-radius:var(--r-tag);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);font-size:var(--fs-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 22px;border-radius:var(--r-pill);background:var(--text);color:var(--on-accent);font-size:var(--fs-nav);font-weight:700;white-space:nowrap;box-shadow:0 8px 20px -8px rgba(var(--ink-rgb),.45);transition:transform var(--speed) var(--ease)}
.btn-login:hover{transform:translateY(-1px)}
.btn-login svg{width:16px;height:16px}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;background:var(--bg-panel-2);border-radius:var(--r-circle)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(7px) 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(-7px) rotate(-45deg)}
.nav-drawer{display:none;position:fixed;z-index:72;top:var(--head-h);right:0;width:min(420px,100%);height:calc(100dvh - var(--head-h));max-height:calc(100dvh - var(--head-h));padding:20px var(--gutter) 32px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm);font-weight:600}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.drawer-label{display:block;padding:8px 16px;font-size:var(--fs-xs);color:var(--text-muted)}
.nav-veil{display:none;position:fixed;z-index:71;inset:var(--head-h) 0 0;background:rgba(var(--ink-rgb),.25)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);padding-top:56px;padding-bottom:28px;margin-top:48px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:360px;margin-top:16px;color:var(--text-muted);font-size:var(--fs-sm)}
.footer-title{font-size:var(--fs-sm);font-weight:800;margin:0 0 14px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 16px;list-style:none;margin:0;padding:0}
.footer-links li{flex:0 1 calc(50% - 8px)}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--fs-sm)}
.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 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-top:20px;font-size:var(--fs-xs);color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity var(--reveal-speed) var(--ease),transform var(--reveal-speed) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.decorated-section{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:24px}
@media(max-width:1100px){
  .site-head{gap:14px;padding-inline:24px}
  .nav-link{padding-inline:12px}
  .lang-switch{padding-inline:8px}
}
@media(max-width:900px){
  .nav-main{display:none}
  .head-actions{margin-left:auto}
  .menu-toggle{display:inline-flex}
  html.nav-open .nav-drawer,html.nav-open .nav-veil{display:block}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:var(--fs-hero-mobile)}
  .sec{padding-top:56px;padding-bottom:56px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px;--fs-brand:18px;--fs-nav:14px;--fs-lead:18px}
  .no-break{white-space:normal}
  .wrap,.reading-wrap{padding-inline:var(--gutter)}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .site-head{gap:8px;padding-inline:12px;flex-wrap:nowrap}
  .brand{gap:6px}
  .brand img{width:28px;height:28px}
  .brand-zh{display:none}
  .head-actions{gap:4px;margin-left:auto}
  .btn-login{padding:10px 14px;font-size:var(--fs-sm)}
  .btn-login svg{display:none}
  .lang-switch{padding-inline:8px;font-size:var(--fs-xs)}
  .lang-switch svg,.lang-switch .caret{display:none}
  .panel,.card{padding:24px}
  .tilt,.tilt-card{transform:none}
  .decorated-section{max-width:100%}
  pre{padding:16px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){
  .brand-word{font-size:var(--fs-body)}
  .site-head{padding-inline:8px;gap:4px}
  .lang-switch{font-size:var(--fs-micro);padding-inline:6px}
  .btn-login{padding-inline:12px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}