:root {
  color-scheme: light;
  --bg:#FAFBFA;
  --panel:#FFFFFF;
  --panel-2:#F0F4F1;
  --line:#E1E7E3;
  --line-dark:#4A5550;
  --accent:#12876C;
  --accent-deep:#0E765E;
  --accent-dark:#0B5C4A;
  --ink:#121A17;
  --muted:#5A6660;
  --muted-2:#8A958F;
  --ok:#1E9E5A;
  --warn:#C98A12;
  --err:#D14343;
  --lime-soft:#E4F6A9;
  --lime-glow:rgba(214,240,120,.55);
  --accent-wash:rgba(18,135,108,.055);
  --accent-08:rgba(18,135,108,.08);
  --accent-14:rgba(18,135,108,.14);
  --accent-line:rgba(18,135,108,.30);
  --pane-line:rgba(18,26,23,.07);
  --hi:rgba(255,255,255,.92);
  --hi-soft:rgba(255,255,255,.22);
  --c1a:#0F4A3E;
  --c1b:#2A7C6A;
  --c2a:#8E9BF5;
  --c2b:#C9D0FF;
  --c3a:#E2F4A6;
  --c3b:#F5FBDA;
  --c4a:#F4C8D7;
  --c4b:#FBE9EF;
  --veil-deep:rgba(6,38,31,.30);
  --veil-light:rgba(255,255,255,.26);
  --glass-dark:rgba(255,255,255,.14);
  --glass-dark-line:rgba(255,255,255,.30);
  --glass-light:rgba(255,255,255,.40);
  --glass-light-line:rgba(255,255,255,.75);
  --flag-red:#D52B1E;
  --flag-blue:#1C3F94;
  --flag-navy:#012169;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --menu-shade:rgba(18,26,23,.28);
  --font-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','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,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-btn:8px;
  --r-mini:6px;
  --r-pane:12px;
  --r-window:11px;
  --r-glass:16px;
  --r-card:20px;
  --r-pill:999px;
  --r-round:50%;
  --r-flag:3px;
  --r-hair:2px;
  --shadow-card:0 1px 2px rgba(18,26,23,.04),0 28px 56px -30px rgba(18,135,108,.34);
  --shadow-pane:0 1px 2px rgba(11,92,74,.10),0 22px 48px -12px rgba(11,92,74,.24);
  --shadow-float:0 2px 4px rgba(18,26,23,.05),0 18px 40px -12px rgba(18,135,108,.28);
  --shadow-cta:inset 0 1px 0 rgba(255,255,255,.22),0 12px 26px -12px rgba(18,135,108,.55);
  --shadow-soft:0 24px 72px rgba(18,135,108,.10);
  --gutter:32px;
  --content-width:1312px;
  --header-h:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-6:48px;
  --space-8:64px;
  --space-9:72px;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lede:18px;
  --title-display:64px;
  --title-section:36px;
  --title-card:20px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --weight-black:900;
  --ease-fast:.15s;
  --ease-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--text-base);line-height:1.5;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--accent-08)}
a{color:inherit;text-underline-offset:.2em}
button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--ink);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.5vw,72px);line-height:1.12;font-weight:var(--weight-black);letter-spacing:-.02em}
h2{font-size:var(--title-section);line-height:1.2;font-weight:var(--weight-heavy);letter-spacing:-.02em}
h3{font-size:var(--title-card);line-height:1.4;font-weight:var(--weight-heavy)}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);border:1px solid var(--line);border-radius:var(--r-pane);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
main,section,article,aside,nav,div{min-width:0}
.no-break{white-space:nowrap}
.wrap,.shell{width:100%;max-width:var(--content-width);padding-inline:var(--gutter);margin-inline:auto}
.sec{padding-top:var(--space-8);padding-bottom:var(--space-8)}
.stack{display:grid;gap:var(--space-3)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.grid>*{min-width:0}
.panel,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-card);padding:var(--space-3);box-shadow:var(--shadow-card)}
.panel h3,.card h3{margin-top:0}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.eyebrow{margin:0 0 8px;font-size:13px;font-weight:var(--weight-bold);letter-spacing:.06em;color:var(--accent)}
.section-heading{margin:0 0 var(--space-3)}
.prose{max-width:840px;line-height:1.85}
.prose h2{margin-top:var(--space-6)}
.prose h3{margin-top:var(--space-4)}
.prose li+li{margin-top:var(--space-1)}
.prose a{color:var(--accent-dark)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 22px;border:1px solid var(--clear);border-radius:var(--r-btn);font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-bold);line-height:1.5;text-decoration:none;transition:background var(--ease-fast),border-color var(--ease-fast);flex-shrink:0;white-space:nowrap}
.btn svg{width:18px;height:18px}
.btn-main,.btn-primary{color:var(--panel);background:linear-gradient(180deg,var(--accent),var(--accent-deep));box-shadow:var(--shadow-cta)}
.btn-main:hover,.btn-primary:hover,.btn.is-hover{background:var(--accent-dark)}
.btn:active{transform:translateY(1px)}
.btn-ghost,.btn-secondary{color:var(--ink);background:var(--panel);border-color:var(--line-dark);font-weight:var(--weight-semibold)}
.btn-ghost svg{color:var(--accent)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--accent-dark);background:var(--panel-2)}
.btn-small{min-height:36px;padding:6px 14px;font-size:var(--text-sm)}
.btn-text{color:var(--muted);background:var(--clear);box-shadow:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:22px}
.site-top{position:relative;z-index:60;border-bottom:1px solid var(--line)}
#site-header{position:relative;z-index:60;min-height:var(--header-h)}
.top{position:relative;z-index:63;display:flex;align-items:center;gap:32px;height:var(--header-h);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:19px;letter-spacing:-.01em;color:var(--ink);flex-shrink:0}
.brand img{width:32px;height:32px;flex-shrink:0}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.nav{flex:1;min-width:0;display:flex;justify-content:center}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav li{display:flex;align-items:center;flex-shrink:0}
.nav li+li::before{content:"·";color:var(--muted-2);font-weight:var(--weight-bold);padding:0 10px}
.nav a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm);color:var(--muted);text-decoration:none;padding:6px 2px;transition:color var(--ease-fast);white-space:nowrap}
.nav a:hover{color:var(--accent-dark)}
.nav a[aria-current="page"]{color:var(--ink);font-weight:var(--weight-bold)}
.top-end{display:flex;align-items:center;gap:16px;flex-shrink:0;margin-left:auto}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:36px;width:auto;padding:6px 4px;border:0;background:var(--clear);font:inherit;font-size:var(--text-sm);color:var(--muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:184px;padding:8px;border:1px solid var(--line);border-radius:var(--r-pane);background:var(--panel);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 12px;border-radius:var(--r-mini);text-decoration:none;font-size:var(--text-sm);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{color:var(--accent-dark);background:var(--accent-08)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 16px;border-radius:var(--r-btn);background:var(--accent-dark);color:var(--panel);font-size:var(--text-sm);font-weight:var(--weight-bold);text-decoration:none;white-space:nowrap;transition:background var(--ease-fast)}
.login:hover{background:var(--accent)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--line);border-radius:var(--r-btn);background:var(--panel);color:var(--ink)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-hair)}
.mobile-drawer{position:fixed;top:var(--header-h);right:0;left:0;z-index:62;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);border-top:1px solid var(--line)}
.mobile-drawer .footer-links{grid-template-columns:minmax(0,1fr)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-btn)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{color:var(--accent-dark);background:var(--accent-08)}
.drawer-languages{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}
.menu-veil{position:fixed;inset:var(--header-h) 0 0;z-index:61;background:var(--menu-shade);border:0}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--line);padding-top:var(--space-6);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-6)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;color:var(--muted);font-size:var(--text-sm);line-height:1.8}
.footer-title{margin:0 0 16px;font-size:var(--text-sm);font-weight:var(--weight-bold)}
.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;color:var(--muted);font-size:var(--text-sm);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;padding-top:var(--space-4);margin-top:var(--space-4);border-top:1px solid var(--line)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:var(--space-3);font-size:var(--text-sm);color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.reveal{transition:opacity var(--ease-reveal) ease,transform var(--ease-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:160px;max-width:100%;overflow:hidden;margin-block:var(--space-3)}
#server-status+*{margin-top:var(--space-3)}
#server-status>*{min-width:0;max-width:100%}
.decoration-host{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1180px){
  .top{gap:20px}
  .nav li+li::before{padding:0 6px}
  .nav a{font-size:13px}
  .top-end{gap:12px}
}
@media(max-width:1100px){
  .nav{display:none}
  .top{justify-content:space-between}
  .top-end{margin-left:auto}
  .menu-toggle{display:inline-flex}
}
@media(min-width:1101px){
  .mobile-drawer,.menu-veil{display:none}
}
@media(max-width:768px){
  :root{--gutter:16px;--title-section:26px}
  h1{font-size:clamp(28px,7vw,40px)}
  .grid{grid-template-columns:minmax(0,1fr)}
  .sec{padding-top:var(--space-6);padding-bottom:var(--space-6)}
  .lang span{display:none}
  .top{gap:12px}
  .top-end{gap:8px;margin-left:auto}
  .btn{min-height:46px;padding:10px 18px;font-size:15px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:var(--space-4)}
  .decoration-host{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.decorative-tilt{transform:none}
}
@media(max-width:360px){
  .brand{font-size:17px;gap:6px}
  .brand img{width:28px;height:28px}
  .login{padding-inline:12px}
  .top-end{gap:4px}
}
@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}
}