:root{
  --bg:#F9F4E8;--bg-top:#FCF8EF;--bg-bottom:#F3EBDC;
  --panel:#FFFDF8;--panel-2:#F1E9DA;--panel-3:#F7F1E5;
  --border:#E6DCC8;--border-soft:#EEE6D6;
  --accent:#246BE3;--accent-dark:#1A52B3;--accent-light:#4F8CF0;--accent-soft:#E3ECFB;
  --text:#2A2118;--muted:#6E6252;--faint:#9C8F7C;
  --success:#2F9E5B;--warn:#E8792B;--error:#D6453A;--yellow:#F2B53A;--purple:#8C62D6;
  --orange-soft:#FBDDC4;--gray-dot:#D3C7B3;--white:#FFFFFF;
  --tint-blue:rgba(36,107,227,.08);--tint-orange:rgba(232,121,43,.09);
  --tint-green:rgba(47,158,91,.09);--tint-purple:rgba(140,98,214,.12);--tint-yellow:rgba(242,181,58,.16);
  --accent-10:rgba(36,107,227,.10);--accent-12:rgba(36,107,227,.12);--accent-28:rgba(36,107,227,.28);
  --glow:rgba(36,107,227,.06);--shade:rgba(42,33,24,.07);--shade-2:rgba(42,33,24,.16);
  --hi:rgba(255,255,255,.9);--hi-soft:rgba(255,255,255,.28);--clear:transparent;
  --r-xs:6px;--r-sm:10px;--r-btn:12px;--r-md:14px;--r-lg:20px;--r-xl:24px;--r-pill:999px;--r-circle:50%;
  --f-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  --f-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  --f-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-brand:800;--weight-display:900;
  --size-body:16px;--size-small:14px;--size-display:68px;--size-section:40px;
  --gutter:40px;--content:1280px;--reading:800px;--header-height:68px;--anchor-offset:84px;--toc-offset:152px;
  --shadow-panel:inset 0 1px 0 var(--hi),0 20px 48px -28px var(--accent-12);
  --ease:cubic-bezier(.2,.7,.2,1);--speed:.2s;--reveal-speed:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font:var(--weight-body) var(--size-body)/1.7 var(--f-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body,main,article,section,aside,header,footer,nav,div{min-width:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:var(--accent-dark);text-underline-offset:.2em}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--accent-10)}
button{color:inherit}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3,h4{color:var(--text);font-family:var(--f-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);line-height:1.1;font-weight:var(--weight-display);letter-spacing:-.02em;margin-bottom:24px}
h2{font-size:var(--size-section);line-height:1.2;font-weight:var(--weight-display);letter-spacing:-.02em;margin-bottom:24px}
h3{font-size:24px;line-height:1.35;font-weight:var(--weight-brand);margin-bottom:16px}
p{margin-bottom:16px}
ul,ol{padding-left:1.4em}
li{padding-left:.1em}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:.12em .3em;font-size:.9em}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);border:1px solid var(--border);padding:20px;border-radius:var(--r-md)}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:72px;padding-bottom:72px}
.stack{display:grid;gap:24px}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two>*,.grid-three>*{min-width:0}
.eyebrow{font-size:13px;font-weight:var(--weight-semibold);color:var(--muted);letter-spacing:.04em;margin-bottom:12px}
.muted{color:var(--muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.panel,.card{padding:28px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-xl);box-shadow:var(--shadow-panel)}
.panel-inset{padding:24px;background:var(--panel-2);border-radius:var(--r-xl)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:52px;padding:0 28px;border:1px solid var(--clear);border-radius:var(--r-btn);font:var(--weight-semibold) 17px/1 var(--f-body);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background var(--speed),box-shadow var(--speed)}
.btn-pri,.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent-light) 0%,var(--accent) 62%);box-shadow:inset 0 1px 0 var(--hi-soft),0 14px 26px -14px var(--accent-28),0 2px 4px var(--accent-12)}
.btn-pri:hover,.btn-primary:hover,.btn-pri.is-hover{background:var(--accent-dark)}
.btn-sec,.btn-secondary{color:var(--accent-dark);background:var(--accent-soft)}
.btn-sec:hover,.btn-secondary:hover{background:var(--accent-10)}
.btn-plain{color:var(--text);background:var(--panel);border-color:var(--border)}
.btn:active,.btn.is-active{box-shadow:inset 0 2px 5px var(--shade-2)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;border-color:var(--border)}
.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font:var(--weight-brand) 19px/1 var(--f-display);letter-spacing:-.01em;color:var(--text);flex-shrink:0}
.brand img{width:34px;height:34px;flex-shrink:0}
.brand-zh{font-size:15px;font-weight:var(--weight-medium);color:var(--muted)}
#site-header{position:relative;z-index:50;min-height:var(--header-height)}
.nav{position:relative;z-index:55;max-width:var(--content);margin:0 auto;height:var(--header-height);padding:0 var(--gutter);display:flex;align-items:center;flex-wrap:nowrap;gap:24px}
.desktop-nav{flex:1;min-width:0}
.menu{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:clamp(10px,1.5vw,26px)}
.menu li{padding:0;min-width:0}
.menu a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none;font-size:14px;font-weight:var(--weight-medium);color:var(--text);white-space:nowrap}
.menu a:hover{color:var(--accent)}
.menu a[aria-current="page"]{font-weight:var(--weight-brand)}
.nav-end{display:flex;align-items:center;gap:14px;flex-shrink:0}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 18px;border-radius:var(--r-sm);background:var(--accent);color:var(--white);text-decoration:none;font-size:15px;font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-soft),0 6px 14px -8px var(--accent-28)}
.login:hover{background:var(--accent-dark)}
.language{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:38px;min-width:44px;width:auto;padding:0 5px;background:var(--clear);border:0;font-size:14px;color:var(--muted);white-space:nowrap}
.lang-button::after{content:"⌄"}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;min-width:170px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:0 16px 40px var(--shade-2)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-xs);text-decoration:none;color:var(--text);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.burger{display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--text)}
.burger-line{display:block;width:20px;height:2px;background:currentColor;transition:transform var(--speed)}
.burger[aria-expanded="true"] .burger-line:first-child{transform:translateY(6px) rotate(45deg)}
.burger[aria-expanded="true"] .burger-line:nth-child(2){opacity:0}
.burger[aria-expanded="true"] .burger-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.drawer{position:fixed;z-index:52;inset:var(--header-height) 0 auto;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.drawer ul{display:block;list-style:none;margin:0;padding:0}
.drawer li{padding:0}
.drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 14px;border-radius:var(--r-sm);text-decoration:none;color:var(--text)}
.drawer a:hover,.drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-label{color:var(--muted);font-size:13px;margin:20px 14px 8px}
html.nav-open{overflow:hidden}
html.nav-open #site-header{background:var(--bg-top)}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{color:var(--muted);font-size:14px;margin:20px 0 12px;max-width:340px}
.footer-title{font-size:14px;font-weight:var(--weight-bold);margin:0 0 12px}
.footer-links{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-links li{padding:0}
.footer-links a,.footer-languages a,.legal-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:14px;text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.legal-links a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--border);padding-top:20px;margin-top:24px;font-size:13px;color:var(--muted)}
.footer-bottom p{margin:0}
.legal-links{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}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.prose img{border-radius:var(--r-md)}
.prose a{overflow-wrap:anywhere}
@media(max-width:1200px){
  .desktop-nav{display:none}
  .nav-end{margin-left:auto}
  .burger{display:flex}
}
@media(max-width:768px){
  :root{--gutter:18px;--header-height:60px;--anchor-offset:76px;--toc-offset:140px;--size-section:30px}
  h1{font-size:36px}
  h2{font-size:30px}
  h3{font-size:22px}
  .nav{gap:12px}
  .nav-end{margin-left:auto;gap:8px}
  .sec{padding-top:48px;padding-bottom:48px}
  .grid-two,.grid-three,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{gap:32px}
  .btn{height:48px;padding:0 22px;font-size:16px}
  .panel,.card{padding:22px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  h1{font-size:32px}
  .brand{gap:6px;font-size:15px}
  .brand img{width:28px;height:28px}
  .nav{gap:8px}
  .nav-end{gap:4px}
  .login{min-height:36px;padding:0 11px;font-size:13px}
  .lang-button{font-size:10px;gap:2px;padding:0 3px}
  .burger{min-width:44px}
  .tilt,.decorative-tilt{transform:none}
  .top,.decorated-section{max-width:100%;overflow-x:clip}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}