:root{
  --bg:#E4ECF4;--bg-top:#EEF3F9;--panel:#F6F9FC;--panel-2:#D7E2EE;--panel-veil:rgba(246,249,252,.62);
  --border:#C6D3E2;--border-soft:rgba(198,211,226,.72);--border-strong:#9CAFC4;
  --accent:#A0179C;--accent-dark:#6F0F6C;--violet:#6B3BE0;--accent-glow:#D24ACD;--violet-glow:#9372F0;
  --signal:#F7C548;--signal-shadow:rgba(217,154,6,.22);
  --text:#12202B;--text-muted:#55667B;--link-muted:#5B7290;--ink-hover:#1E3242;
  --success:#1E9A5A;--warn:#D99A06;--error:#D23A3A;--white:#FFFFFF;--transparent:transparent;
  --accent-08:rgba(160,23,156,.08);--accent-12:rgba(160,23,156,.12);--accent-14:rgba(160,23,156,.14);--accent-40:rgba(210,74,205,.38);--violet-06:rgba(107,59,224,.06);
  --ink-04:rgba(18,32,43,.04);--ink-06:rgba(18,32,43,.06);--ink-08:rgba(18,32,43,.08);--ink-shadow:rgba(18,32,43,.22);--veil:rgba(18,32,43,.38);
  --hl-white:rgba(255,255,255,.72);--hl-white-12:rgba(255,255,255,.12);
  --win-top:#0F1620;--win-bottom:#141D29;--win-card:#182230;--win-card-2:#202C3C;
  --win-line:rgba(255,255,255,.07);--win-hl:rgba(255,255,255,.08);--win-hl-top:rgba(255,255,255,.13);
  --win-text:#E9EEF5;--win-muted:#93A3B7;--win-dim:#6A7B90;--win-link:#A3B6CC;
  --win-track:rgba(255,255,255,.07);--win-dot:rgba(255,255,255,.16);--win-toggle:rgba(255,255,255,.22);
  --glass:rgba(255,255,255,.07);--glass-border:rgba(255,255,255,.14);--glass-shadow:rgba(4,8,14,.42);
  --warn-ring:rgba(217,154,6,.16);--success-ring:rgba(30,154,90,.18);
  --flag-red:#D7263D;--flag-white:#FFFFFF;--flag-blue:#26386F;--flag-green:#1B8A4C;--flag-black:#1B1B1B;--flag-gold:#F2C230;--flag-edge:rgba(18,32,43,.16);--flag-edge-dark:rgba(255,255,255,.18);
  --grad:linear-gradient(90deg,var(--accent) 0%,var(--violet) 100%);--grad-bright:linear-gradient(90deg,var(--accent-glow) 0%,var(--violet-glow) 100%);
  --r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-xl:14px;--r-pill:999px;--r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;--fs-sm:14px;--fs-body:16px;--fs-lg:19px;--fs-h3:24px;--fs-h2:32px;
  --fs-h1:clamp(52px,5vw,72px);--fs-hero:68px;--fw-body:400;--fw-medium:500;--fw-semibold:600;--fw-bold:700;--fw-heavy:800;--fw-display:900;
  --lh-body:1.75;--lh-heading:1.2;--tracking-title:-.03em;--tracking-cjk:-.02em;
  --gutter:24px;--content:1360px;--reading:840px;--header-height:72px;--anchor-offset:88px;--toc-offset:88px;--section-gap:96px;
  --ease:ease;--fast:.2s;--reveal-time:.36s;--shadow-panel:0 12px 36px var(--accent-08),inset 0 1px 0 var(--hl-white);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--fw-body);line-height:var(--lh-body);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--violet);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3,h4{font-family:var(--font-display);line-height:var(--lh-heading);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:var(--fw-display);letter-spacing:var(--tracking-cjk);line-height:1.12}
h2{font-size:var(--fs-h2);font-weight:var(--fw-heavy);letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--fs-h3);font-weight:var(--fw-bold)}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-lg);background:var(--win-card);color:var(--win-text)}
pre code{overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:calc(var(--content) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.stack{display:grid;gap:24px}
.grid{display:grid;gap:24px}
.grid>*:where(*),.stack>*{min-width:0}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.ico{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:20px}
.prose h2{margin-top:56px;margin-bottom:24px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:28px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px;color:var(--link-muted)}
.prose li+li{margin-top:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:10px 28px;border-radius:var(--r-md);font-size:var(--fs-body);font-weight:var(--fw-bold);line-height:1.5;flex-shrink:0;white-space:nowrap;transition:transform var(--fast),box-shadow var(--fast),background var(--fast),border-color var(--fast)}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--text);color:var(--white);box-shadow:0 10px 24px var(--ink-shadow),inset 0 1px 0 var(--hl-white-12)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--ink-hover);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--panel-veil);color:var(--text);border:1.5px solid var(--border-strong)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;transform:none;box-shadow:none;pointer-events:none}
.btn.is-focus{outline:2px solid var(--violet);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:28px}
.card,.surface{padding:32px;border-radius:var(--r-lg);background:var(--panel);border:1px solid var(--border-soft);box-shadow:var(--shadow-panel);min-width:0}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:80px;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
html.nav-open{overflow:hidden}
#site-header{position:relative;z-index:60}
.topbar{position:relative;z-index:60;border-bottom:1px solid var(--border-soft)}
.topbar-inner{width:min(calc(100% - 80px),1360px);margin:0 auto;height:var(--header-height);display:flex;align-items:center;gap:40px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand .logo{width:32px;height:32px}
.brand-name{font-family:var(--font-display);font-weight:var(--fw-heavy);font-size:19px;letter-spacing:-.02em;color:var(--text);white-space:nowrap}
.tabs{flex:1;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:0}
.tabs li{flex-shrink:0}
.tabs a{position:relative;display:block;height:72px;line-height:72px;padding:0 14px;font-size:15px;color:var(--text-muted);white-space:nowrap;transition:color var(--fast)}
.tabs a::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:var(--r-xs) var(--r-xs) 0 0;background:var(--text);transform:scaleX(0);transform-origin:center;transition:transform .25s ease,opacity .25s}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{transform:scaleX(1);opacity:.28}
.tabs a[aria-current="page"]{color:var(--text);font-weight:var(--fw-semibold)}
.tabs a[aria-current="page"]::after{transform:scaleX(1);opacity:1}
.topbar-end{margin-left:auto;display:flex;align-items:center;gap:20px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;min-width:44px;width:auto;font-size:var(--fs-sm);color:var(--text-muted);white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-txt{white-space:nowrap}
.caret{font-size:11px}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow-panel)}
.language-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-sm)}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 20px;border-radius:var(--r-md);background:var(--text);color:var(--white);font-size:var(--fs-sm);font-weight:var(--fw-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-white-12);transition:background var(--fast)}
.btn-login:hover{background:var(--ink-hover)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;color:var(--text);border-radius:var(--r-sm)}
.menu-toggle svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.menu-toggle[aria-expanded="true"]{background:var(--panel-2)}
.mobile-drawer{position:fixed;z-index:58;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 40px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 16px;border-bottom:1px solid var(--border-soft);color:var(--text)}
.mobile-drawer a[aria-current]{font-weight:var(--fw-bold);background:var(--panel-2)}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:57;background:var(--veil)}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:64px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:340px;margin-top:20px;color:var(--text-muted);font-size:var(--fs-sm)}
.footer-heading{font-size:var(--fs-sm);font-weight:var(--fw-bold);margin-bottom:16px}
.footer-links{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:32px;font-size:var(--fs-sm);color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px}
.footer-languages a[aria-current]{color:var(--text);font-weight:var(--fw-bold)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:24px;padding-top:24px;border-top:1px solid var(--border-strong);font-size:var(--fs-sm);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:24px}
@media(max-width:1380px){
  .topbar-inner{gap:24px}
  .tabs a{padding-inline:10px}
  .tabs a::after{left:10px;right:10px}
  .topbar-end{gap:14px}
}
@media(max-width:1180px){
  .tabs a{padding-inline:8px;font-size:var(--fs-sm)}
  .topbar-inner{gap:16px}
}
@media(max-width:1080px){
  .tabs{display:none}
  .menu-toggle{display:inline-flex}
  .topbar-end{margin-left:auto}
}
@media(max-width:768px){
  :root{--gutter:16px;--section-gap:64px}
  h1{font-size:40px}
  h2{font-size:28px}
  .topbar-inner{width:calc(100% - 32px)}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .card,.surface{padding:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  h1{font-size:36px}
  .topbar-inner{gap:8px}
  .topbar-end{gap:6px;margin-left:auto}
  .brand{gap:6px}
  .brand-name{font-size:16px}
  .brand .logo{width:28px;height:28px}
  .btn-login{padding-inline:12px}
  .lang .lang-txt{display:none}
  .tilt,[data-tilt]{transform:none!important}
  .halo,.stripe-halo{max-width:100%}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation:none!important;transition:none!important}
}