:root{
  --c-bg:#F9F9FA;
  --c-panel:#FFFFFF;
  --c-panel-2:#F1F2F4;
  --c-border:#E4E5E9;
  --c-ink:#12141B;
  --c-black:#000000;
  --c-graphite:#3A3D47;
  --c-text:#15171D;
  --c-muted:#5F636D;
  --c-success:#1F9D57;
  --c-warn:#B7791F;
  --c-error:#D2362F;
  --c-success-soft:rgba(31,157,87,.16);
  --c-white:#FFFFFF;
  --c-white-0:rgba(255,255,255,0);
  --c-white-10:rgba(255,255,255,.10);
  --c-white-18:rgba(255,255,255,.18);
  --c-white-50:rgba(255,255,255,.5);
  --c-white-72:rgba(255,255,255,.72);
  --c-white-86:rgba(255,255,255,.86);
  --c-ink-00:rgba(18,20,27,0);
  --c-ink-04:rgba(18,20,27,.04);
  --c-ink-05:rgba(18,20,27,.05);
  --c-ink-06:rgba(18,20,27,.06);
  --c-ink-08:rgba(18,20,27,.08);
  --c-ink-10:rgba(18,20,27,.10);
  --c-ink-12:rgba(18,20,27,.12);
  --c-ink-14:rgba(18,20,27,.14);
  --c-ink-18:rgba(18,20,27,.18);
  --c-ink-24:rgba(18,20,27,.24);
  --c-gr-0:rgba(58,61,71,0);
  --c-gr-03:rgba(58,61,71,.03);
  --c-gr-06:rgba(58,61,71,.06);
  --c-transparent:transparent;
  --c-flag-red:#CC2B33;
  --c-flag-navy:#24376F;
  --c-flag-gold:#EDBF2F;
  --c-flag-black:#15171D;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-title:500;
  --weight-brand:600;
  --r-panel:6px;
  --r-flag:3px;
  --r-small:4px;
  --r-dot:50%;
  --r-mark:1px;
  --r-pill:999px;
  --gutter:48px;
  --page-width:1424px;
  --header-height:64px;
  --anchor-gap:80px;
  --toc-offset:12px;
  --toc-anchor:104px;
  --space-section:80px;
  --sh-chip:0 10px 24px -14px var(--c-ink-14),0 1px 2px var(--c-ink-05);
  --sh-float:0 24px 48px -20px var(--c-ink-14),0 2px 8px var(--c-ink-06);
  --sh-btn:0 12px 28px -14px var(--c-ink-24),inset 0 1px 0 var(--c-white-18);
  --sh-panel:0 32px 72px -24px var(--c-ink-10),inset 0 1px 0 var(--c-white);
  --sh-fixed:0 16px 32px -14px var(--c-ink-24),0 2px 6px var(--c-ink-10);
  --ease-ui:200ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--f-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--c-ink-08)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--c-ink);outline-offset:3px}
:where(h1,h2,h3,h4,p,ul,ol,figure,blockquote){margin-top:0}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:var(--weight-title);color:var(--c-ink);overflow-wrap:break-word;text-wrap:balance}
h1{font-size:clamp(52px,4.6vw,66px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(28px,3.2vw,44px);line-height:1.2;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.35;letter-spacing:-.01em}
p{margin-bottom:24px}
strong{font-weight:var(--weight-brand)}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--c-panel-2);border:1px solid var(--c-border);border-radius:var(--r-panel)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{text-align:left}
:where(.shell,.wrap){width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
:where(.grid,.hero-grid,.feature-browser,.card-grid,.footer-grid)>*{min-width:0}
:where(main,article,section,aside,nav,div){min-width:0}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:760px;margin-bottom:40px}
.muted{color:var(--c-muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.h1{margin:0 0 40px;font-size:clamp(44px,4.6vw,66px);font-weight:var(--weight-title);line-height:1.08;letter-spacing:-.03em}
.h1-a,.h1-b{display:block}
.h1-b,.h2-b{color:var(--c-graphite)}
.h2{margin:0 0 20px;max-width:16em;font-size:clamp(30px,3.2vw,44px);line-height:1.15;letter-spacing:-.03em}
.lede{margin:0 0 32px;max-width:30em;font-size:16px;line-height:26px;color:var(--c-muted)}
.lede strong{color:var(--c-text);font-weight:var(--weight-title)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 26px;border:1px solid var(--c-transparent);border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-title);text-decoration:none;white-space:nowrap;flex-shrink:0;gap:8px;transition:background-color var(--ease-ui),border-color var(--ease-ui),box-shadow var(--ease-ui)}
.btn-solid,.btn-primary{background:var(--c-ink);color:var(--c-white);box-shadow:var(--sh-btn)}
.btn-solid:hover,.btn-primary:hover,.btn.is-hover{background:var(--c-graphite)}
.btn-ghost,.btn-secondary{background:var(--c-panel);color:var(--c-text);border-color:var(--c-border);box-shadow:0 1px 2px var(--c-ink-04)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--c-ink-18)}
.btn:active{box-shadow:inset 0 2px 4px var(--c-ink-12)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);border-color:var(--c-border);box-shadow:none}
.btn.is-focus{outline:2px solid var(--c-ink);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 32px}
.panel,.card{background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-panel);box-shadow:var(--sh-panel);padding:28px}
.prose{max-width:800px;margin-inline:auto;overflow-wrap:anywhere}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li{margin-bottom:10px}
.prose a{overflow-wrap:anywhere}
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;overflow:hidden;max-width:100%;min-width:0;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.topbar{position:relative;z-index:100}
.topbar-in{height:var(--header-height);display:flex;align-items:center;gap:44px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-text);flex:none;white-space:nowrap}
.brand-mark{width:28px;height:28px;display:block}
.brand-word{font-family:var(--f-display);font-weight:var(--weight-brand);font-size:17px;letter-spacing:-.01em}
.brand-zh{font-weight:var(--weight-normal);color:var(--c-muted)}
.nav{display:flex;align-items:center;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:30px}
.nav li{flex-shrink:0}
.nav a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--c-muted);text-decoration:none;padding:6px 0;white-space:nowrap;transition:color var(--ease-ui)}
.nav a:hover{color:var(--c-text)}
.nav a[aria-current="page"]{color:var(--c-text);font-weight:var(--weight-title)}
.topbar-end{margin-left:auto;display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{font:inherit;font-size:14px;color:var(--c-muted);background:none;border:0;padding:6px;min-height:36px;min-width:44px;width:auto;display:inline-flex;align-items:center;justify-content:center;gap:6px;white-space:nowrap}
.lang:hover{color:var(--c-text)}
.lang-caret{font-size:11px}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:140;min-width:168px;padding:8px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-panel);box-shadow:var(--sh-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;font-size:14px;white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--c-panel-2)}
.btn-login{min-height:36px;padding:0 18px;border-radius:var(--r-pill);display:inline-flex;align-items:center;justify-content:center;background:var(--c-ink);color:var(--c-white);font-size:14px;font-weight:var(--weight-title);text-decoration:none;box-shadow:var(--sh-btn);white-space:nowrap;transition:background-color var(--ease-ui)}
.btn-login:hover{background:var(--c-graphite)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;border:0;background:var(--c-transparent);color:var(--c-ink);padding:10px}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none}
.menu-veil{display:none}
.site-footer{border-top:1px solid var(--c-border);background:var(--c-panel-2);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.3fr;gap:48px}
.footer-intro{margin-top:20px;max-width:28em;color:var(--c-muted);font-size:14px}
.footer-title{font-size:14px;margin:0 0 16px;font-weight:var(--weight-title)}
.footer-links{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none;font-size:13px;color:var(--c-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--c-ink);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--c-border)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;font-size:13px;color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
@media(min-width:901px) and (max-width:1280px){
  .topbar-in{gap:26px}
  .nav ul{gap:20px}
  :lang(en) .topbar-in,:lang(ja) .topbar-in,:lang(ko) .topbar-in{gap:18px}
  :lang(en) .nav ul,:lang(ja) .nav ul,:lang(ko) .nav ul{gap:14px}
  :lang(en) .nav a,:lang(ja) .nav a,:lang(ko) .nav a{font-size:12px}
}
@media(max-width:1180px){:root{--gutter:32px}.footer-grid{gap:32px}}
@media(max-width:900px){
  .nav{display:none}
  .topbar-in{gap:12px}
  .topbar-end{margin-left:auto;gap:10px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:110;background:var(--c-panel);padding:20px var(--gutter) 40px;border-top:1px solid var(--c-border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer a{display:flex;width:100%;align-items:center;min-height:48px;padding:12px 8px;text-decoration:none;border-bottom:1px solid var(--c-border);font-size:15px}
  .mobile-drawer a[aria-current]{font-weight:var(--weight-brand);background:var(--c-panel-2)}
  .drawer-languages{margin-top:24px;border-top:1px solid var(--c-border)}
  .menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:105;background:var(--c-ink-24)}
  .menu-veil:not([hidden]){display:block}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:56px}
  h1,.h1{font-size:clamp(32px,9.6vw,40px)}
  .h1{margin-bottom:28px}
  .cta-row,.lede{margin-bottom:24px}
  .footer-grid{grid-template-columns:1fr}
  .section-head{margin-bottom:28px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt{transform:none}
  :where(.decor-zone,.stripe-halo){max-width:100%;overflow-x:clip}
  .topbar-end{gap:4px;margin-left:auto}
  .topbar-in{gap:8px}
  .brand{gap:7px}
  .brand-word{font-size:15px}
  .brand-mark{width:25px;height:25px}
  .lang{font-size:12px;gap:4px;padding-inline:4px}
  .btn-login{font-size:13px;padding-inline:12px}
  .panel,.card{padding:20px}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .topbar-end{gap:2px}
  .brand-word{font-size:14px}
  .brand-mark{width:22px;height:22px}
  .lang{font-size:11px}
  .btn-login{padding-inline:10px}
}
@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}
}