:root{
  --bg:#F6FAFC;--bg-top:#FAFCFE;--bg-bottom:#EEF4F8;
  --panel:#FFFFFF;--panel-2:#ECF2F6;--panel-3:#F3F7FA;
  --border:#DCE4EB;--border-soft:#E8EEF3;
  --accent:#5847C9;--accent-2:#8C7EE8;--lilac:#E2DAFA;--lilac-soft:#F1EEFD;
  --sky:#4A9CCB;--sky-soft:#E5F0F7;
  --ink:#1E1A2E;--ink-2:#36304F;--text:#1B1826;--muted:#5D6475;--faint:#8B92A2;
  --success:#1F9D6B;--success-soft:#E2F3EB;--success-ring:rgba(31,157,107,.18);
  --warn:#C98A12;--error:#D2463C;
  --metal-1:#F2F4F7;--metal-2:#CED4DC;--metal-3:#A8B1BC;
  --flag-red:#D52B2F;--flag-blue:#283A7E;--flag-white:#FFFFFF;--flag-edge:rgba(30,26,46,.14);
  --sheen:rgba(255,255,255,.62);--sheen-mid:rgba(255,255,255,.32);--sheen-0:rgba(255,255,255,0);
  --bezel-hl:rgba(255,255,255,.16);--bezel-cam:#3A3450;--veil:rgba(30,26,46,.3);
  --shadow-device:0 72px 100px -48px rgba(88,71,201,.26),0 36px 72px -30px rgba(88,71,201,.12),0 10px 22px -8px rgba(30,26,46,.22);
  --shadow-phone:0 44px 64px -26px rgba(88,71,201,.30),0 14px 28px -12px rgba(30,26,46,.24);
  --shadow-card:0 20px 44px -16px rgba(88,71,201,.22),0 2px 6px rgba(30,26,46,.06);
  --shadow-soft:0 6px 16px -8px rgba(88,71,201,.18),0 1px 2px rgba(30,26,46,.05);
  --shadow-cta:0 14px 26px -12px rgba(30,26,46,.55),0 4px 10px -4px rgba(88,71,201,.28);
  --shadow-base:0 18px 26px -14px rgba(30,26,46,.30);
  --shadow-login:0 8px 18px -10px var(--ink),inset 0 1px 0 var(--bezel-hl);
  --hl:inset 0 1px 0 rgba(255,255,255,.95);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --r-xs:4px;--r-sm:7px;--r-md:10px;--r-lg:14px;--r-xl:22px;--r-pill:999px;
  --r-screen:6px;--r-phone:34px;--r-phone-screen:27px;--r-base:2px 2px 12px 12px;--r-notch:0 0 7px 7px;
  --r-phone-left:2px 0 0 2px;--r-phone-right:0 2px 2px 0;
  --wrap:1312px;--gutter:64px;--header-h:72px;--anchor-space:88px;--toc-space:152px;
  --text-xs:12px;--text-sm:14px;--text-base:16px;--text-lg:20px;
  --h1-size:clamp(52px,4.73vw,68px);--h2-size:clamp(28px,3vw,40px);--h3-size:24px;
  --section-space:80px;--ease:ease;--fast:.2s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
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;text-rendering:optimizeLegibility}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--lilac-soft)}
button{border:0}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:var(--h1-size);font-weight:900;line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--h2-size);font-weight:800;line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--h3-size);font-weight:750;line-height:1.35}
ul,ol{padding-left:1.5em}
pre,code{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-heading{margin-bottom:32px}
.section-heading p{margin-top:16px;max-width:46em;color:var(--muted)}
.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}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*,:where(main,article,section,nav,aside,header,footer)>*{min-width:0}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--panel);box-shadow:var(--shadow-soft),var(--hl)}
.panel h3,.card h3{margin-bottom:12px}
.prose{max-width:76ch}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:20px}
.prose h2{margin-top:56px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose img{border-radius:var(--r-md)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:12px 30px;border-radius:var(--r-pill);font-size:var(--text-base);font-weight:700;letter-spacing:.01em;white-space:nowrap;flex-shrink:0;transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease),background-color var(--fast) var(--ease)}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,var(--ink-2),var(--ink));color:var(--panel);box-shadow:var(--shadow-cta),inset 0 1px 0 var(--bezel-hl)}
.btn-primary:hover{color:var(--panel);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border:1.5px solid var(--ink);box-shadow:var(--shadow-soft)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel-3);color:var(--text)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
.btn-small{min-height:40px;padding:8px 20px;font-size:var(--text-sm)}
.cta-row{display:flex;flex-wrap:wrap;gap:14px}
.site-header,#site-header{position:relative;z-index:50}
.nav{display:flex;align-items:center;height:var(--header-h);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--text)}
.brand:hover{color:var(--text)}
.brand-mark{width:30px;height:30px;flex:none}
.brand-word{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em}
.tabs{margin-left:auto;flex:1;min-width:0}
.tabs ul{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0;gap:0}
.tab{position:relative;display:flex;align-items:center;justify-content:center;height:var(--header-h);padding:0 14px;font-size:14.5px;font-weight:500;color:var(--muted);white-space:nowrap;transition:color var(--fast) var(--ease)}
.tab::after{content:"";position:absolute;left:14px;right:14px;bottom:15px;height:2px;border-radius:var(--r-pill);background:var(--accent);transform:scaleX(0);transition:transform .25s var(--ease)}
.tab:hover{color:var(--text)}
.tab:hover::after{transform:scaleX(.35)}
.tab[aria-current="page"]{color:var(--text);font-weight:650}
.tab[aria-current="page"]::after{transform:scaleX(1)}
.nav-end{display:flex;align-items:center;gap:10px;margin-left:22px;padding-left:22px;border-left:1px solid var(--border);flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:36px;padding:0 10px;border-radius:var(--r-pill);background:var(--sheen-0);font-size:13.5px;font-weight:500;color:var(--muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang-caret{font-size:11px;color:var(--faint)}
.lang:hover{color:var(--text);background:var(--panel-2)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:80;min-width:180px;padding:8px;border-radius:var(--r-lg);background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--text-sm)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--lilac-soft);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 22px;border-radius:var(--r-pill);background:var(--ink);color:var(--panel);font-size:14px;font-weight:700;letter-spacing:.02em;box-shadow:var(--shadow-login);white-space:nowrap}
.login:hover{background:var(--ink-2);color:var(--panel)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);color:var(--ink)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-7px) rotate(-45deg)}
.mobile-drawer{position:fixed;top:var(--header-h);left:0;right:0;z-index:60;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:20px var(--gutter) 40px}
.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;border-radius:var(--r-md)}
.mobile-drawer a[aria-current],.mobile-drawer a:hover{background:var(--lilac-soft);color:var(--accent)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-h) 0 0;z-index:55;background:var(--veil)}
html.nav-open{overflow:hidden}
html.nav-open #site-header{position:sticky;top:0;background:var(--panel)}
.site-footer,#site-footer{background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:48px;padding-top:56px;padding-bottom:40px}
.footer-brand p{max-width:30em;margin-top:20px;color:var(--muted);font-size:var(--text-sm)}
.footer-title{font-size:var(--text-sm);font-weight:750;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px;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:var(--text-sm)}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;padding-top:20px;padding-bottom:20px;border-top:1px solid var(--border)}
.footer-languages a[aria-current]{color:var(--accent);font-weight:700}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:20px;padding-bottom:28px;border-top:1px solid var(--border);font-size:var(--text-xs);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.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-height:80px;overflow:hidden;max-width:100%;margin-block:24px}
#server-status+*{margin-top:32px}
.counter-stat,[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
.decor-region,.top{position:relative;overflow-x:clip;max-width:100%}
@media(min-width:1101px) and (max-width:1320px){
  .tab{padding-inline:8px;font-size:13px}
  .tab::after{left:8px;right:8px}
  .nav-end{gap:6px;margin-left:12px;padding-left:12px}
}
@media(max-width:1100px){
  :root{--gutter:32px}
  .tabs{display:none}
  .nav-end{margin-left:auto}
  .menu-toggle{display:flex}
  .footer-grid{gap:28px}
}
@media(min-width:1101px){.mobile-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  :root{--h1-size:clamp(28px,7vw,40px);--h2-size:28px;--h3-size:21px;--section-space:56px}
  .grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px;--header-h:64px;--anchor-space:80px;--toc-space:144px}
  .no-break{white-space:normal}
  .wrap{width:100%;padding-inline:var(--gutter)}
  .nav-end{gap:4px;padding-left:0;border-left:0;margin-left:auto}
  .brand{gap:6px}
  .brand-mark{width:25px;height:25px}
  .brand-word{font-size:17px}
  .login{min-height:38px;padding:8px 14px;font-size:13px}
  .lang{font-size:12px;padding-inline:6px;gap:3px}
  .lang svg,.lang-caret{display:none}
  .menu-toggle{min-width:44px}
  .panel,.card{padding:22px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .tilt,[data-tilt]{transform:none}
  .decor-region{max-width:100%;overflow-x:clip}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .brand-word{font-size:15px}
  .brand-mark{width:22px;height:22px}
  .login{padding-inline:10px}
  .lang{font-size:11px;padding-inline:4px}
  .nav-end{gap:2px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.tab,.tab::after{transition:none}
}