:root {
  --bg:#F4F7F6;
  --bg-top:#F8FBFA;
  --bg-bottom:#EEF3F1;
  --panel:#FFFFFF;
  --panel-2:#E9F0ED;
  --panel-2-deep:#E1EAE6;
  --chrome-end:#F1F6F4;
  --glass:rgba(255,255,255,.62);
  --border:#DCE4E1;
  --border-soft:#E8EEEB;
  --border-strong:#C3CFCA;
  --accent:#0F8C5A;
  --accent-dark:#0A6A44;
  --accent-2:#22B08A;
  --accent-tint:rgba(15,140,90,.09);
  --accent-line:rgba(15,140,90,.32);
  --pick-a:rgba(15,140,90,.12);
  --pick-b:rgba(34,176,138,.08);
  --text:#1B2421;
  --text-muted:#5B6965;
  --text-faint:#86948F;
  --success:#1E9E58;
  --warn:#C2860F;
  --error:#CF4637;
  --on-accent:#FFFFFF;
  --dot-1:#D3DCD8;
  --dot-2:#CAD4CF;
  --dot-3:#C0CBC6;
  --spot-mint:rgba(15,140,90,.08);
  --spot-cyan:rgba(34,176,138,.07);
  --hi:rgba(255,255,255,.95);
  --hi-soft:rgba(255,255,255,.24);
  --flag-red:#D23B3E;
  --flag-white:#FFFFFF;
  --flag-blue:#2D4B8E;
  --flag-edge:rgba(27,36,33,.14);
  --veil:rgba(27,36,33,.28);
  --clear:transparent;
  --shadow-xs:0 1px 2px rgba(27,36,33,.05);
  --shadow-panel:0 24px 48px rgba(15,140,90,.12),0 2px 8px rgba(15,140,90,.05);
  --shadow-float:0 30px 60px rgba(15,140,90,.18),0 10px 22px rgba(15,140,90,.10);
  --shadow-btn:0 10px 22px rgba(15,140,90,.24);
  --r-btn:10px;
  --r-card:14px;
  --r-chip:8px;
  --r-sm:6px;
  --r-pill:999px;
  --r-round:50%;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,-apple-system,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-body:16px;
  --fs-small:14px;
  --fs-caption:12px;
  --fs-h1:clamp(52px,4.85vw,66px);
  --fs-h2:clamp(28px,3vw,40px);
  --fs-h3:22px;
  --gutter:40px;
  --content-max:1360px;
  --head-height:72px;
  --anchor-space:88px;
  --toc-space:144px;
  --section-space:80px;
  --ease:ease;
  --time-fast:.2s;
  --time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,p,figure{margin-top:0}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:800;line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);line-height:1.2;font-weight:800;letter-spacing:-.02em}
h3{font-size:var(--fs-h3);line-height:1.35;font-weight:700}
p{margin-bottom:1.25em}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto;vertical-align:middle}
svg{flex-shrink:0;vertical-align:middle}
ul{list-style:none;margin:0;padding:0}
ol{padding-left:1.5em}
li{overflow-wrap:break-word}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-chip);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.wrap > *, :where(.grid,.hero-grid,.head-bar,.footer-grid) > *{min-width:0}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.reading-wrap{max-width:880px;margin-inline:auto;padding-inline:var(--gutter)}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.5em}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose ul{list-style:disc;padding-left:1.5em;margin-block:1em}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.eyebrow{font-size:var(--fs-small);font-weight:600;color:var(--text-muted);margin-bottom:16px}
.accent{color:var(--accent)}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.ico-line{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ico-fill{fill:currentColor}
.ico{width:20px;height:20px}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel),inset 0 1px 0 var(--hi);padding:24px;min-width:0}
.panel-inset{background:var(--panel-2);border-radius:var(--r-card);padding:24px;min-width:0}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-four{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:52px;padding:0 24px;border:1px solid var(--clear);border-radius:var(--r-btn);font-size:var(--fs-body);font-weight:600;white-space:nowrap;flex-shrink:0;transition:transform var(--time-fast) var(--ease),box-shadow var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease)}
.btn svg{width:18px;height:18px}
.btn-primary{color:var(--on-accent);background:linear-gradient(135deg,var(--accent) 0%,var(--accent) 48%,var(--accent-2) 130%);box-shadow:var(--shadow-btn),inset 0 1px 0 var(--hi-soft)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--panel);border-color:var(--border);box-shadow:var(--shadow-xs)}
.btn-ghost svg{color:var(--text-muted)}
.btn-ghost:hover,.btn-secondary:hover{transform:translateY(-1px);border-color:var(--border-strong)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;box-shadow:none;transform:none;pointer-events:none}
.btn-small{height:40px;padding-inline:16px;font-size:var(--fs-small)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.site-head,#site-header{position:relative;z-index:50}
.head-bar{position:relative;display:flex;align-items:center;gap:24px;min-height:var(--head-height)}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--f-display);font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text);flex-shrink:0}
.brand-mark{width:32px;height:32px}
.main-nav{margin-left:12px;flex:1;min-width:0}
.nav-pills{display:flex;align-items:center;list-style:none;margin:0;padding:4px;gap:2px;width:max-content;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--glass);box-shadow:inset 0 1px 0 var(--hi)}
.nav-pills a{display:flex;align-items:center;min-height:36px;padding:7px 13px;border-radius:var(--r-pill);font-size:var(--fs-small);font-weight:500;color:var(--text-muted);white-space:nowrap;transition:color var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease)}
.nav-pills a:hover{color:var(--text)}
.nav-pills a[aria-current="page"]{background:var(--accent-tint);color:var(--accent-dark);font-weight:600}
.head-tools{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-box{position:relative}
.lang-switch{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:40px;min-width:44px;width:auto;padding:0 12px;border:0;border-radius:var(--r-btn);background:var(--clear);font:inherit;font-size:var(--fs-small);color:var(--text-muted);cursor:pointer}
.lang-switch span{white-space:nowrap}
.lang-switch svg{width:16px;height:16px}
.lang-switch:hover{color:var(--text)}
.lang-panel{position:absolute;z-index:80;top:calc(100% + 8px);right:0;min-width:180px;padding:6px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-chip);font-size:var(--fs-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-tint);color:var(--accent-dark)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 18px;border-radius:var(--r-btn);background:var(--accent);color:var(--on-accent);font-size:var(--fs-small);font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-soft),var(--shadow-xs);transition:background-color var(--time-fast) var(--ease)}
.login-btn svg{width:16px;height:16px}
.login-btn:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-btn);color:var(--text);background:var(--panel)}
.menu-toggle svg{width:20px;height:20px}
.mobile-drawer{display:none;position:fixed;z-index:61;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-chip);color:var(--text-muted)}
.mobile-drawer a[aria-current]{background:var(--accent-tint);color:var(--accent-dark)}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.menu-veil{display:none;position:fixed;z-index:60;inset:var(--head-height) 0 0;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:linear-gradient(180deg,var(--panel),var(--bg-bottom));padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:350px;margin-top:20px;color:var(--text-muted);font-size:var(--fs-small)}
.footer-title{font-size:var(--fs-small);font-weight:700;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:24px;color:var(--text-muted);font-size:var(--fs-small)}
.footer-links a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;padding-top:32px;padding-bottom:24px}
.footer-languages a[aria-current]{color:var(--accent-dark);font-weight:600}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;border-top:1px solid var(--border);padding-top:24px;font-size:var(--fs-caption);color:var(--text-muted)}
.footer-legal{display:flex;gap:24px}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;width:100%;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status + *{margin-top:24px}
#server-status > *{min-width:0;max-width:100%}
@media(max-width:1240px){
  .head-bar{gap:16px}
  .main-nav{margin-left:4px}
  .nav-pills a{padding:7px 10px}
}
@media(max-width:1180px){
  .main-nav{display:none}
  .menu-toggle{display:inline-flex}
  .head-tools{margin-left:auto}
  html.nav-open .mobile-drawer{display:block}
  html.nav-open .menu-veil{display:block}
  .head-bar{z-index:62;background:var(--bg-top)}
}
@media(max-width:768px){
  :root{--gutter:20px;--section-space:48px;--fs-h1:38px}
  .head-bar{gap:12px;flex-wrap:nowrap}
  .head-tools{gap:6px;margin-left:auto}
  .lang-switch span{display:none}
  .grid-three,.grid-four{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .btn{height:50px;padding-inline:18px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .stage,.decorated{max-width:100%;overflow-x:clip}
  .grid-three{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:480px){
  :root{--fs-h1:34px}
  .brand{font-size:18px;gap:7px}
  .brand-mark{width:28px;height:28px}
  .head-bar{gap:6px}
  .login-btn{padding-inline:12px}
  .login-btn svg{display:none}
  .lang-switch{padding-inline:8px}
  .head-tools{gap:4px}
  .grid-four,.grid-five{grid-template-columns:minmax(0,1fr)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}