:root {
  --bg:#F5F9FC;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#EBF0F7;
  --border:#DFE5EF;
  --border-strong:#C9D2E1;
  --line:#B4BED1;
  --accent:#3E5CE8;
  --accent-dark:#2B41B8;
  --accent-hi:#5A75F1;
  --orchid:#C566E6;
  --text:#12172A;
  --text-muted:#5B6478;
  --text-soft:#8790A4;
  --success:#2FA36B;
  --warn:#D9822B;
  --error:#D64550;
  --on-accent:#FFFFFF;
  --hero-top:#F9FBFE;
  --hero-bottom:#EEF3F9;
  --clear:transparent;
  --grid-line:rgba(62,92,232,.035);
  --accent-tint:rgba(62,92,232,.08);
  --accent-tint-2:rgba(62,92,232,.16);
  --accent-line:rgba(62,92,232,.42);
  --accent-ring:rgba(62,92,232,.07);
  --shadow-tint:rgba(62,92,232,.10);
  --shadow-tint-2:rgba(62,92,232,.14);
  --shadow-cta:rgba(62,92,232,.18);
  --shadow-soft:rgba(18,23,42,.05);
  --veil:rgba(18,23,42,.28);
  --hi-line:rgba(255,255,255,.9);
  --sheen:rgba(255,255,255,.12);
  --btn-hi:rgba(255,255,255,.22);
  --glow-ice:rgba(110,180,255,.09);
  --glow-orchid:rgba(197,102,230,.06);
  --rose-50:#FDF1F3;
  --rose-100:#FBE3E6;
  --rose-500:#E07A8A;
  --rose-600:#C2475A;
  --violet-50:#F5F4FD;
  --violet-100:#ECEAFB;
  --violet-500:#8B7FE3;
  --violet-600:#6A5CD6;
  --mint-50:#ECF7F0;
  --mint-100:#D9F0E1;
  --mint-500:#5FBF7E;
  --mint-700:#2E8A50;
  --flag-red:#C9454F;
  --flag-white:#F7F8FB;
  --flag-blue:#33468C;
  --r-xs:4px;
  --r-sm:8px;
  --r-md:10px;
  --r-lg:12px;
  --r-xl:16px;
  --r-pill:999px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-display:68px;
  --fs-h2:36px;
  --fs-h3:22px;
  --fs-body:16px;
  --fs-small:14px;
  --fs-micro:12px;
  --weight-display:800;
  --weight-bold:700;
  --weight-medium:600;
  --weight-body:400;
  --gutter:24px;
  --wrap-width:1240px;
  --reading-width:800px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:88px;
  --section-space:72px;
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --time-fast:.15s;
  --time-reveal:.35s;
  --panel-shadow:0 40px 80px -28px var(--shadow-tint),0 18px 36px -18px var(--shadow-tint-2),0 1px 2px var(--shadow-soft);
  --focus-ring:2px solid var(--accent);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-body);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.65}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,select,input,textarea{color:var(--text)}
button{border:0}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:var(--focus-ring);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);font-weight:var(--weight-display);letter-spacing:-.02em}
h2{font-size:var(--fs-h2);letter-spacing:-.02em}
h3{font-size:var(--fs-h3)}
p{margin:0 0 20px}
h2,h3{margin:0 0 20px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
blockquote{margin:0}
.wrap{max-width:var(--wrap-width);margin:0 auto;padding-inline:var(--gutter)}
.reading-wrap{max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.page-heading{padding-top:calc(var(--header-height) + 48px);padding-bottom:40px}
.page-heading h1{margin:0 0 24px}
.section-heading{max-width:800px;margin-bottom:32px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.prose a{color:var(--accent-dark)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.panel{padding:28px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--bg-panel);box-shadow:var(--panel-shadow),inset 0 1px 0 var(--hi-line)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
:where(.card-grid,.panel,.wrap,.reading-wrap)>*{min-width:0}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;width:100%;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 28px;border:1px solid var(--clear);border-radius:var(--r-md);font-family:var(--font-body);font-size:16px;font-weight:700;line-height:1.2;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform var(--time-fast) ease,box-shadow var(--time-fast) ease,background var(--time-fast) ease}
.btn svg{width:16px;height:16px;flex-shrink:0}
.btn-primary{background:linear-gradient(180deg,var(--accent-hi),var(--accent));color:var(--on-accent);box-shadow:0 12px 26px -8px var(--shadow-cta),0 2px 6px var(--shadow-tint),inset 0 1px 0 var(--btn-hi)}
.btn-primary:hover,.btn-primary.is-hover{background:linear-gradient(180deg,var(--accent),var(--accent-dark));transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border);box-shadow:0 1px 2px var(--shadow-soft)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--border-strong);transform:translateY(-1px)}
.btn-sm{min-height:36px;padding:0 18px;font-size:14px;border-radius:var(--r-sm)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.btn.is-focus{outline:var(--focus-ring);outline-offset:3px}
.topbar{position:absolute;top:0;left:0;right:0;z-index:50}
#site-header{height:var(--header-height);position:relative;z-index:50}
.topbar-in{height:var(--header-height);display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;flex-shrink:0}
.brand img{width:30px;height:30px;flex-shrink:0}
.brand-num{color:var(--accent)}
.desktop-nav{flex:1;min-width:0}
.nav{display:flex;align-items:center;justify-content:flex-end;gap:26px;margin:0;padding:0;list-style:none}
.nav a{display:inline-flex;align-items:center;min-height:32px;font-size:14.5px;font-weight:500;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--time-fast)}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:700}
.top-actions{display:flex;align-items:center;gap:10px;margin-left:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;min-height:36px;min-width:44px;width:auto;font-family:var(--font-body);font-size:14px;font-weight:500;color:var(--text-muted);background:none;border:0;padding:7px 10px;border-radius:var(--r-sm);cursor:pointer;white-space:nowrap}
.lang:hover{background:var(--accent-tint);color:var(--text)}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:80;width:180px;margin:0;padding:8px;list-style:none;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--panel-shadow)}
.language-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm);font-size:14px}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--accent-tint);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--r-sm);background:var(--accent);color:var(--on-accent);font-size:14px;font-weight:700;text-decoration:none;white-space:nowrap;box-shadow:0 6px 16px -6px var(--shadow-cta),inset 0 1px 0 var(--btn-hi);transition:background-color var(--time-fast)}
.btn-login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:44px;min-height:44px;background:var(--clear);color:var(--text);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"]{background:var(--accent-tint);color:var(--accent)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:60;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--bg-panel);border-top:1px solid var(--border)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-tint);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px!important;padding-top:16px!important}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:40;background:var(--veil);border:0}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{color:var(--text-muted);font-size:14px;max-width:340px;margin-top:16px}
.footer-title{font-size:14px;font-weight:700;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;list-style:none;margin:0;padding:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:20px;color:var(--text-muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
@media(max-width:1200px){.topbar-in{gap:20px}.nav{gap:18px}.nav a{font-size:13px}}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .top-actions{margin-left:auto}
  .menu-toggle{display:flex}
}
@media(min-width:1101px){.mobile-drawer,.menu-veil{display:none!important}}
@media(max-width:768px){
  :root{--fs-h2:28px;--fs-h3:20px;--section-space:48px}
  h1{font-size:38px;line-height:1.12}
  .card-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .panel{padding:20px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .topbar-in{gap:8px}
  .brand{font-size:17px;gap:7px}
  .brand img{width:26px;height:26px}
  .top-actions{margin-left:auto;gap:2px}
  .lang{font-size:11px;padding-inline:6px}
  .btn-login{font-size:13px;padding-inline:12px}
  .tilt,.float-refund{transform:none}
  .decor-region,.hero-atmos,.stage-glow{max-width:100%}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn-login,.nav a{transition:none}
  .btn:hover{transform:none}
}