:root {
  --bg:#E6EEF6;
  --panel:#F8FBFE;
  --panel-2:#D8E4EF;
  --border:#C9D7E4;
  --accent:#2B8A3E;
  --accent-2:#3BA55A;
  --accent-dark:#1E6B2E;
  --accent-rgb:43,138,62;
  --text:#14202B;
  --text-rgb:20,32,43;
  --text-muted:#55667A;
  --success:#23874A;
  --warn:#B7791F;
  --error:#C2413A;
  --on-accent:#FFFFFF;
  --highlight:rgba(255,255,255,.92);
  --cta-highlight:rgba(255,255,255,.18);
  --transparent:transparent;
  --hero-top:#EEF4FA;
  --hero-bottom:#E0EAF3;
  --chrome-bg:#EEF3F9;
  --mint-wash:#E2F1E8;
  --glow-mint-rgb:58,196,170;
  --glow-peri-rgb:128,142,236;
  --flag-red:#C2413A;
  --flag-navy:#22396B;
  --flag-white:#F8FBFE;
  --veil:rgba(20,32,43,.28);
  --font-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','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,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --text-base:17px;
  --text-small:14px;
  --text-lead:19px;
  --h1-size:clamp(52px,4.45vw,66px);
  --h2-size:32px;
  --h3-size:22px;
  --r-btn:8px;
  --r-route:10px;
  --r-inner:12px;
  --r-card:14px;
  --r-win:16px;
  --r-chrome:15px;
  --r-pill:999px;
  --r-round:50%;
  --r-indicator:2px;
  --gutter:48px;
  --head-height:72px;
  --anchor-offset:88px;
  --toc-offset:152px;
  --content-width:1416px;
  --reading-width:800px;
  --shadow-card:inset 0 1px 0 var(--highlight),0 18px 44px rgba(var(--accent-rgb),.08),0 1px 3px rgba(var(--text-rgb),.04);
  --shadow-win:inset 0 1px 0 var(--highlight),0 30px 60px rgba(var(--accent-rgb),.10),0 2px 8px rgba(var(--text-rgb),.05);
  --shadow-float:inset 0 1px 0 var(--highlight),0 28px 56px rgba(var(--accent-rgb),.16),0 8px 18px rgba(var(--text-rgb),.09);
  --shadow-cta:inset 0 1px 0 var(--cta-highlight),0 10px 24px rgba(var(--accent-rgb),.24);
  --ease-ui:cubic-bezier(.2,.6,.3,1);
  --speed-ui:.2s;
  --speed-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button,select,input,textarea{max-width:100%}
button{border:0}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-btn)}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{font-size:var(--h1-size);font-weight:var(--weight-display);letter-spacing:-.02em;line-height:1.12;margin:0 0 24px}
h2{font-size:var(--h2-size);font-weight:var(--weight-display);letter-spacing:-.02em;line-height:1.25;margin:0 0 24px}
h3{font-size:var(--h3-size);font-weight:var(--weight-bold);line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-inner)}
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:calc(var(--reading-width) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:800px;margin-bottom:40px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:where(.grid,.hero-inner,.win-body,.footer-grid)>*{min-width:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.card,.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:32px;min-width:0}
.panel-inset{background:var(--panel-2);border-radius:var(--r-inner);padding:24px}
.prose{min-width:0;overflow-wrap:break-word}
.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}
.prose :where(ul,ol){padding-left:24px}
.prose img{border-radius:var(--r-inner)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 24px;font-size:16px;font-weight:var(--weight-semibold);line-height:1.5;border:1px solid var(--transparent);border-radius:var(--r-btn);transition:transform var(--speed-ui) var(--ease-ui),background var(--speed-ui) var(--ease-ui),box-shadow var(--speed-ui) var(--ease-ui);text-align:center}
.btn svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{color:var(--on-accent);background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:var(--shadow-cta)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--panel);border-color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--bg);transform:translateY(-1px)}
.btn:active,.btn.is-active{transform:translateY(1px);box-shadow:none}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.badge,.tag,.fact-chip{display:inline-flex;align-items:center;gap:8px;max-width:100%;padding:5px 14px;color:var(--text-muted);font-size:13.5px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel)}
.badge{min-height:34px;box-shadow:inset 0 1px 0 var(--highlight)}
.badge b{font-weight:var(--weight-semibold);color:var(--text);font-variant-numeric:tabular-nums}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--r-round);background:var(--accent);box-shadow:0 0 0 3px rgba(var(--accent-rgb),.16)}
.tag{overflow:hidden;overflow-wrap:anywhere;white-space:normal}
.fact-chip b{color:var(--text);font-weight:var(--weight-semibold)}
.site-head,#site-header{position:relative;z-index:50;border-bottom:1px solid rgba(var(--text-rgb),.07)}
.head-inner{display:flex;flex-wrap:nowrap;align-items:center;height:var(--head-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font-family:var(--font-display);font-weight:var(--weight-display);font-size:21px;letter-spacing:-.02em;color:var(--text);white-space:nowrap}
.brand-mark{width:30px;height:30px;flex-shrink:0}
.desktop-nav{flex:1;min-width:0;margin-left:48px}
.nav-tabs{display:flex;align-items:center;gap:0;list-style:none;margin:0;padding:0;height:var(--head-height)}
.nav-tabs li{height:100%;flex-shrink:0}
.nav-tabs a{position:relative;display:flex;align-items:center;height:100%;padding:0 14px;font-size:15px;font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap;transition:color var(--speed-ui) ease}
.nav-tabs a:hover{color:var(--text)}
.nav-tabs a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.nav-tabs a[aria-current="page"]::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:var(--r-indicator);background:var(--accent)}
.head-actions{display:flex;align-items:center;gap:12px;margin-left:auto;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 10px;font-size:14px;font-weight:var(--weight-medium);color:var(--text-muted);background:var(--transparent);border:0;border-radius:var(--r-btn);white-space:nowrap}
.lang:hover{color:var(--text);background:rgba(var(--text-rgb),.04)}
.lang svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.6}
.lang-text{white-space:nowrap}
.lang-panel{position:absolute;top:calc(100% + 12px);right:0;z-index:80;width:200px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-inner);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-btn);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 20px;font-size:14px;font-weight:var(--weight-semibold);color:var(--text);white-space:nowrap;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-btn);box-shadow:inset 0 1px 0 var(--highlight),0 4px 12px rgba(var(--accent-rgb),.08)}
.btn-login:hover{border-color:var(--text-muted)}
.menu-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:44px;min-height:44px;background:var(--transparent);border:1px solid var(--border);border-radius:var(--r-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--head-height);right:0;left:0;z-index:60;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));padding:16px var(--gutter) 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{color:var(--accent-dark);font-weight:var(--weight-semibold)}
.drawer-heading{display:block;padding:24px 16px 8px;color:var(--text-muted);font-size:13px}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:55;background:var(--veil);border:0}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.1fr .8fr;gap:40px}
.footer-brand p{max-width:32em;margin-top:20px;color:var(--text-muted);font-size:15px}
.footer-heading{margin:0 0 16px;font-size:16px;font-weight:var(--weight-bold)}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-bottom a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--speed-reveal) ease,transform var(--speed-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:flow-root;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.decorated,.page-top{position:relative;max-width:100%;overflow-x:clip}
.stat-number,[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
@media(min-width:1021px){.mobile-drawer,.nav-veil{display:none!important}}
@media(max-width:1280px){
  .desktop-nav{margin-left:28px}
  .nav-tabs{gap:2px}
  .nav-tabs a{padding-inline:11px}
  .nav-tabs a[aria-current="page"]::after{left:11px;right:11px}
}
@media(max-width:1180px){
  .desktop-nav{margin-left:20px}
  .nav-tabs a{padding-inline:8px;font-size:14px}
  .head-actions{gap:8px}
}
@media(max-width:1020px){
  .desktop-nav{display:none}
  .menu-toggle{display:flex}
  .head-actions{margin-left:auto}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px;--h1-size:40px;--h2-size:26px;--h3-size:20px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .card,.panel{padding:24px}
  .footer-grid{gap:32px 24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.decorative-tilt{transform:none}
  .decorated,.page-top,.glows{max-width:100%}
  .lang-text{display:none}
  .head-actions{margin-left:auto;gap:6px}
  .lang{padding-inline:8px}
  .brand{font-size:18px;gap:7px}
  .brand-mark{width:26px;height:26px}
  .btn-login{padding-inline:12px}
  .cta-row>.btn{flex:1 1 auto}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:16px}
  .brand-mark{width:24px;height:24px}
  .head-actions{gap:4px}
  .btn-login{padding-inline:10px}
  .lang{min-width:32px;padding-inline:6px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}