:root{
  --bg:#FAFBFD;
  --panel:#FFFFFF;
  --panel-2:#EFF2F5;
  --line:#D6DBE3;
  --accent:#1F63E6;
  --accent-dark:#1544B3;
  --ink:#22262C;
  --ink-muted:#5A6270;
  --ink-bar:#2A2D33;
  --indigo:#3B3FB6;
  --indigo-deep:#2B2E8C;
  --lemon:#FFCE1F;
  --rouge:#FBB6DD;
  --persimmon:#FFAA4C;
  --celadon:#9EEFE0;
  --sky:#C6D8FB;
  --success:#1E9C6B;
  --warn:#E08A1E;
  --error:#D33449;
  --white:#FFFFFF;
  --flag-red:#D7263D;
  --flag-navy:#1F2F6E;
  --flag-black:#1C1C1E;
  --flag-gold:#FFCC00;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --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',Menlo,Consolas,monospace;
  --weight-light:300;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-key:800;
  --text-xs:11px;
  --text-sm:13px;
  --text-ui:14px;
  --text-nav:15px;
  --text-body:16px;
  --text-lead:20px;
  --text-heading:22px;
  --text-section:36px;
  --text-display:64px;
  --r-0:0px;
  --r-dot:2px;
  --r-cell:3px;
  --r-sm:4px;
  --r-md:6px;
  --r-chrome:2.5px;
  --r-round:50%;
  --stroke:1.5px;
  --container:1200px;
  --reading:820px;
  --gutter:24px;
  --head-height:64px;
  --toc-height:60px;
  --anchor-offset:140px;
  --space-section:80px;
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --duration-fast:.2s;
  --duration-reveal:.35s;
  --shadow-stage:0 32px 48px -16px color-mix(in srgb,var(--accent) 14%,transparent),0 6px 16px color-mix(in srgb,var(--accent) 6%,transparent);
  --shadow-win:0 18px 36px -14px color-mix(in srgb,var(--accent) 22%,transparent);
  --shadow-float:0 16px 32px -10px color-mix(in srgb,var(--accent) 22%,transparent),0 2px 6px color-mix(in srgb,var(--ink) 6%,transparent);
  --shadow-chip:0 1px 2px color-mix(in srgb,var(--accent) 8%,transparent);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--text-body);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
[hidden]{display:none!important}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:var(--accent);text-underline-offset:4px}
button,a,summary,input,select,textarea{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-normal);line-height:1.25;overflow-wrap:break-word;text-wrap:balance}
h1{font-size:clamp(52px,5vw,64px);letter-spacing:-.02em}
h2{font-size:var(--text-section);margin:0 0 24px}
h3{font-size:var(--text-heading)}
p{margin:0 0 20px}
strong{font-weight:var(--weight-semibold)}
.no-break{white-space:nowrap}
.key{color:var(--accent);font-weight:var(--weight-key)}
.muted{color:var(--ink-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.wrap{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:780px;margin-bottom:32px}
.section-head p{color:var(--ink-muted);font-size:var(--text-lead)}
:where(.grid,.card-grid,.footer-grid)>*{min-width:0}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.panel,.card{min-width:0;padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-sm);box-shadow:var(--shadow-chip)}
.panel-raised{border:var(--stroke) solid var(--ink);box-shadow:inset 0 1px 0 var(--white),var(--shadow-win)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-dot);padding:2px 4px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--line);border-radius:var(--r-sm);line-height:1.65}
pre code{padding:0;overflow-wrap:normal;white-space:pre}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.9}
.prose li+li{margin-top:8px}
.prose img{border-radius:var(--r-sm)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:48px;padding:0 28px;border:var(--stroke) solid var(--ink);border-radius:var(--r-0);font-size:var(--text-body);font-weight:var(--weight-semibold);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color var(--duration-fast),color var(--duration-fast),border-color var(--duration-fast)}
.btn svg{width:18px;height:10px}
.btn-primary{background:var(--ink);color:var(--white);border-color:var(--ink)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--ink)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);border-color:var(--line);color:var(--ink-muted);cursor:not-allowed}
.btn-small{height:40px;padding-inline:18px;font-size:var(--text-ui)}
.btn-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:24px}
.site-head{position:relative;z-index:40;background:color-mix(in srgb,var(--panel) 70%,var(--bg));border-bottom:1px solid var(--line)}
.head-inner{max-width:var(--container);margin:0 auto;padding:0 var(--gutter);height:var(--head-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--ink);text-decoration:none;font-family:var(--font-display);font-size:19px;font-weight:var(--weight-bold);letter-spacing:-.01em;white-space:nowrap;min-height:28px}
.brand img{width:28px;height:28px;flex:none}
.main-nav{height:100%;flex:1;min-width:0}
.tabs{display:flex;align-items:center;gap:16px;height:100%;list-style:none;margin:0;padding:0}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;min-height:24px;color:var(--ink-muted);font-size:var(--text-nav);text-decoration:none;white-space:nowrap;transition:color var(--duration-fast)}
.tabs a::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--line);transform:scaleX(0);transform-origin:left center;transition:transform .22s ease}
.tabs a:hover{color:var(--ink)}
.tabs a:hover::after{transform:scaleX(1)}
.tabs a[aria-current="page"]{color:var(--ink);font-weight:var(--weight-semibold)}
.tabs a[aria-current="page"]::after{background:var(--accent);transform:scaleX(1)}
.head-actions{margin-left:auto;display:flex;align-items:center;gap:18px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:6px 4px;min-height:36px;min-width:24px;width:auto;border:0;background:var(--clear);color:var(--ink-muted);font-size:var(--text-ui);white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang span{white-space:nowrap}
.lang:hover{color:var(--ink)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:180px;padding:6px;background:var(--panel);border:var(--stroke) solid var(--ink);border-radius:var(--r-sm);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;color:var(--ink)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;min-height:38px;padding:0 20px;border:var(--stroke) solid var(--ink);border-radius:var(--r-0);background:var(--panel);color:var(--ink);font-size:var(--text-ui);font-weight:var(--weight-semibold);text-decoration:none;white-space:nowrap;transition:background-color var(--duration-fast),color var(--duration-fast)}
.btn-login:hover{background:var(--ink);color:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--clear);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--head-height);right:0;left:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));z-index:60;overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 40px;border-top:1px solid var(--line)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}
.mobile-drawer a[aria-current="page"]{color:var(--accent-dark);border-left:3px solid var(--accent);background:var(--panel-2)}
.drawer-languages{margin-top:20px;border-top:var(--stroke) solid var(--ink)}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:50;background:color-mix(in srgb,var(--ink) 30%,transparent);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--line);background:var(--panel-2);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:320px;color:var(--ink-muted);margin-top:16px}
.footer-title{font-size:var(--text-ui);font-weight:var(--weight-semibold);margin:0 0 16px}
.footer-links{list-style:none;margin:0;padding:0;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:28px;color:var(--ink-muted);text-decoration:none;font-size:var(--text-ui)}
.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;margin-top:32px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;border-top:1px solid var(--line);padding-top:20px;margin-top:24px;font-size:var(--text-sm);color:var(--ink-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{max-width:100%;min-width:0}
#server-status+*{margin-top:32px}
.decorated,.stripe-halo-host{position:relative;overflow-x:clip}
@media(max-width:1190px){
  .head-inner{gap:24px}
  .tabs{gap:18px}
  .tabs a{font-size:var(--text-ui)}
  .head-actions{gap:12px}
}
@media(min-width:961px){
  .main-nav{overflow-x:auto;scrollbar-width:none}
  .main-nav::-webkit-scrollbar{display:none}
}
@media(max-width:960px){
  .head-inner{gap:16px}
  .main-nav{display:none}
  .head-actions{margin-left:auto;gap:12px}
  .menu-toggle{display:inline-flex}
  .footer-grid{gap:28px}
}
@media(max-width:768px){
  :root{--space-section:56px;--text-section:28px;--gutter:16px}
  h1{font-size:clamp(28px,7vw,40px);line-height:1.12}
  .card-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-decor,[data-tilt]{transform:none}
  .decorated>*[aria-hidden="true"],.stripe-halo{max-width:100%}
  .head-inner{gap:8px}
  .head-actions{margin-left:auto;gap:8px}
  .brand{font-size:17px;gap:7px}
  .brand img{width:26px;height:26px}
  .lang span{display:none}
  .lang{min-width:32px}
  .btn-login{padding-inline:12px}
  .cta-row .btn{flex:1 1 140px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-links{gap:8px 20px}
}
@media(max-width:350px){
  .head-actions{gap:4px}
  .head-inner{gap:4px}
  .brand{font-size:var(--text-nav);gap:5px}
  .btn-login{padding-inline:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}