:root {
  --bg:#E9EEF8;
  --bg-panel:#F8FAFE;
  --bg-panel-2:#DCE4F3;
  --border:#CBD5E8;
  --accent:#2F55E4;
  --accent-dark:#1A2C86;
  --accent-hi:#5876EE;
  --text:#0F1630;
  --text-muted:#56617C;
  --success:#1E9E6A;
  --warn:#C9861A;
  --error:#D2384B;
  --hero-top:#F1F4FB;
  --hero-bottom:#E3E9F6;
  --nav-bg:rgba(248,250,254,.72);
  --ink:#0F1630;
  --ink-2:#16224A;
  --ink-card:rgba(255,255,255,.04);
  --ink-line:rgba(203,213,232,.12);
  --ink-line-strong:rgba(203,213,232,.22);
  --ink-hl:rgba(255,255,255,.08);
  --ink-edge:rgba(15,22,48,.9);
  --on-ink:#E8EDFA;
  --on-ink-muted:#9AA6C9;
  --on-ink-faint:#66739B;
  --on-accent:#FFFFFF;
  --accent-ink:#A3B6FF;
  --success-ink:#62D7A6;
  --warn-ink:#EDBA66;
  --accent-a06:rgba(47,85,228,.06);
  --accent-a08:rgba(47,85,228,.08);
  --accent-a12:rgba(47,85,228,.12);
  --accent-a14:rgba(47,85,228,.14);
  --accent-a18:rgba(47,85,228,.18);
  --accent-a22:rgba(47,85,228,.22);
  --accent-a30:rgba(47,85,228,.30);
  --accent-a40:rgba(47,85,228,.40);
  --success-a20:rgba(30,158,106,.22);
  --warn-a20:rgba(201,134,26,.22);
  --hl:rgba(255,255,255,.85);
  --hl-dark:rgba(255,255,255,.14);
  --dot-shade:rgba(15,22,48,.18);
  --flag-edge:rgba(15,22,48,.16);
  --transparent:rgba(47,85,228,0);
  --veil:rgba(15,22,48,.42);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:4px;
  --r-sm:6px;
  --r-md:8px;
  --r-lg:10px;
  --r-plate:14px;
  --r-pill:999px;
  --r-circle:50%;
  --shadow-card:0 18px 40px -14px var(--accent-a14),0 2px 6px var(--accent-a06),inset 0 1px 0 var(--hl);
  --shadow-window:0 24px 60px var(--accent-a14),0 6px 16px var(--accent-a08);
  --shadow-float:0 14px 32px -8px var(--accent-a22),0 2px 6px var(--accent-a08),inset 0 1px 0 var(--hl);
  --shadow-btn:0 8px 20px -8px var(--accent-a40),inset 0 1px 0 var(--hl-dark);
  --gutter:40px;
  --wrap-max:1280px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --size-display:64px;
  --size-h2:40px;
  --size-h3:24px;
  --size-body:16px;
  --size-small:14px;
  --weight-display:800;
  --weight-bold:700;
  --motion-fast:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,svg,img{flex-shrink:0}
button{color:inherit}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle}
[hidden]{display:none!important}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
:where(h1,h2,h3,h4,p,ul,ol,dl,figure,blockquote,pre){margin-top:0}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.5vw,64px);font-weight:var(--weight-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--size-h2);line-height:1.15;letter-spacing:-.02em;font-weight:var(--weight-display)}
h3{font-size:var(--size-h3);line-height:1.3;font-weight:var(--weight-bold)}
p{margin-bottom:20px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel-2);font-family:var(--font-mono)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
:where(main,section,article,aside,nav,div,li){min-width:0}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.section-head{margin-bottom:32px}
.section-head .kicker{margin-top:0}
.section-head h2{margin:12px 0 0}
.reading-wrap{max-width:880px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:48px;font-size:32px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.prose blockquote{margin-inline:0;padding:20px 24px;border-left:3px solid var(--accent);background:var(--accent-a06)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.vh{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.icon{width:20px;height:20px;flex:none}
.panel{padding:24px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-card)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.reveal{transition:opacity var(--motion-fast) ease,transform var(--motion-fast) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 24px;border:1px solid var(--border);border-radius:var(--r-sm);font-family:var(--font-body);font-size:16px;font-weight:700;line-height:26px;white-space:nowrap;flex-shrink:0}
.btn svg{width:16px;height:16px}
.btn-primary{background:linear-gradient(180deg,var(--accent-hi) -40%,var(--accent) 60%);border-color:var(--accent-dark);color:var(--on-accent);box-shadow:var(--shadow-btn)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 1px 0 var(--hl)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);border-color:var(--border);color:var(--text-muted);box-shadow:none;cursor:not-allowed}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
#site-header{position:relative;z-index:60;min-height:var(--header-height)}
.nav{position:relative;z-index:65;height:var(--header-height);background:var(--nav-bg);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.nav .wrap{display:flex;flex-wrap:nowrap;align-items:center;gap:28px;height:100%}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand img{width:30px;height:30px;flex:none}
.brand-word{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--text)}
.desktop-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;gap:20px;margin:0;padding:0;list-style:none}
.nav-links a{display:inline-flex;align-items:center;min-height:44px;font-size:15px;font-weight:500;color:var(--text-muted);white-space:nowrap}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:700}
.nav-end{display:flex;align-items:center;gap:16px;margin-left:auto;flex-shrink:0}
.lang-select{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:44px;padding:6px 4px;border:0;background:none;font:inherit;font-size:14px;font-weight:500;color:var(--text-muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:90;min-width:176px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);white-space:nowrap}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--accent-a08);color:var(--accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 18px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);font-size:14px;font-weight:600;color:var(--text);box-shadow:0 2px 6px var(--accent-a06),inset 0 1px 0 var(--hl);white-space:nowrap}
.btn-login:hover{border-color:var(--accent);color:var(--accent)}
.menu-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.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)}
.nav-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:63;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--bg-panel)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text)}
.nav-drawer a[aria-current]{color:var(--accent);font-weight:700}
.drawer-languages{margin-top:24px;border-top:2px solid var(--accent)}
.nav-veil{position:fixed;top:var(--header-height);bottom:0;left:0;right:0;z-index:61;border:0;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--ink);color:var(--on-ink);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.site-footer .brand-word{color:var(--on-ink)}
.footer-intro{margin-top:16px;max-width:30em;color:var(--on-ink-muted);font-size:14px}
.footer-heading{margin-bottom:12px;font-size:14px;font-weight:700;color:var(--on-ink)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;margin:0;padding:0;list-style:none}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--on-ink-muted)}
.site-footer a:hover{color:var(--on-accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--ink-line-strong)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:20px;font-family:var(--font-mono);font-size:12px;color:var(--on-ink-muted)}
.footer-legal{display:flex;gap:24px}
@media(min-width:1400px){
  .nav .wrap{gap:44px}
  .nav-links{gap:28px}
}
@media(max-width:1180px){
  .nav .wrap{gap:20px}
  .nav-links{gap:14px}
  .nav-links a{font-size:14px}
  .nav-end{gap:10px}
}
@media(max-width:1080px){
  .desktop-nav{display:none}
  .menu-toggle{display:flex}
  .nav-end{margin-left:auto}
}
@media(max-width:768px){
  :root{--gutter:20px;--size-display:40px;--size-h2:30px}
  h1{font-size:40px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three,.grid-two,.footer-grid{grid-template-columns:1fr}
  .footer-grid{gap:28px}
  .nav .wrap{gap:12px}
  .nav-end{gap:8px;margin-left:auto}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.stage{transform:none}
  .lang span{display:none}
  .lang{padding-inline:4px}
  .brand{gap:7px}
  .brand-word{font-size:17px}
  .brand img{width:26px;height:26px}
  .btn-login{padding-inline:12px}
  .prose h2{font-size:28px}
  .prose h3{font-size:22px}
  .panel{padding:20px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .nav .wrap{gap:6px}
  .nav-end{gap:2px}
  .brand-word{font-size:16px}
  .btn-login{padding-inline:10px}
  h1{font-size:36px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}