:root{
  --bg:#E5ECF2;
  --bg-top:#EEF3F7;
  --bg-bottom:#E1E9F0;
  --panel:#F7FAFC;
  --panel-2:#D7E1EA;
  --border:#C9D5E0;
  --accent:#0C1E2B;
  --accent-dark:#06111A;
  --text:#0C1622;
  --muted:#566577;
  --success:#1F8A5B;
  --warn:#B7791F;
  --error:#C2413A;
  --sep:#9DABB9;
  --on-accent:#F7FAFC;
  --orb-hi:#33475A;
  --orb-deep:#05090D;
  --orb-line:rgba(255,255,255,.14);
  --orb-rim:rgba(255,255,255,.26);
  --orb-spec:rgba(255,255,255,.15);
  --orb-bounce:rgba(140,176,206,.18);
  --halo-c1:rgba(255,255,255,.36);
  --halo-c2:rgba(255,255,255,.55);
  --halo-c3:rgba(255,255,255,.82);
  --halo-0:rgba(255,255,255,0);
  --glass:rgba(247,250,252,.52);
  --glass-edge:rgba(255,255,255,.88);
  --glass-line:rgba(201,213,224,.8);
  --hl-edge:rgba(255,255,255,.92);
  --btn-hl:rgba(255,255,255,.14);
  --track-line:rgba(86,101,119,.26);
  --sh-10:rgba(40,80,116,.10);
  --sh-14:rgba(40,80,116,.14);
  --sh-18:rgba(40,80,116,.18);
  --sh-0:rgba(40,80,116,0);
  --veil:rgba(12,22,34,.24);
  --flag-red:var(--error);
  --flag-white:var(--panel);
  --flag-navy:var(--accent);
  --flag-edge:rgba(12,30,43,.16);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","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","SFMono-Regular",Menlo,Consolas,monospace;
  --r-pill:999px;
  --r-card:10px;
  --r-sm:6px;
  --gutter:32px;
  --max:1440px;
  --header-h:64px;
  --anchor-gap:80px;
  --toc-offset:16px;
  --toc-landing:96px;
  --display-size:clamp(52px,4.45vw,64px);
  --section-size:clamp(32px,3.3vw,46px);
  --body-size:16px;
  --weight-display:450;
  --weight-medium:550;
  --shadow-panel:inset 0 1px 0 var(--hl-edge),0 24px 64px -20px var(--sh-14);
  --ease-fast:.2s;
  --reveal-time:.35s;
}
*,*::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(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--body-size);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
button{background:var(--panel);border:1px solid var(--border)}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
p,h1,h2,h3,h4,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance}
h1{font-size:var(--display-size);line-height:1.12;letter-spacing:-.02em;color:var(--accent)}
h2{font-size:var(--section-size);line-height:1.18;letter-spacing:-.02em}
h3{font-size:24px;line-height:1.35}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:96px;padding-bottom:96px}
.section-head{max-width:780px;margin-bottom:48px}
.section-head p{margin-top:20px;color:var(--muted);font-size:18px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel);padding:28px}
.inset-panel{background:var(--panel-2);border-radius:var(--r-card);padding:24px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;display:inline-block;flex:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.prose{max-width:800px;margin-inline:auto;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:20px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose h2{margin-top:56px;margin-bottom:24px;font-size:32px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose a{ text-decoration:underline;text-underline-offset:4px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
p code,li code{background:var(--panel-2);padding:2px 5px;border-radius:var(--r-sm)}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);padding:24px;border:1px solid var(--border);border-radius:var(--r-card)}
pre code{overflow-wrap:normal;white-space:pre}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:52px;padding:0 26px;border:0;border-radius:var(--r-pill);font-size:16px;font-weight:500;letter-spacing:-.005em;white-space:nowrap;flex-shrink:0;max-width:100%;transition:transform var(--ease-fast),box-shadow var(--ease-fast)}
.btn svg{width:16px;height:16px;flex:none}
.btn-primary{background:linear-gradient(180deg,var(--orb-hi) -40%,var(--accent) 46%,var(--accent-dark) 100%);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--btn-hl),0 12px 26px -4px var(--sh-18),0 2px 4px var(--sh-10)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--btn-hl),0 16px 32px -4px var(--sh-18),0 2px 4px var(--sh-10)}
.btn-secondary{background:var(--panel);color:var(--text);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hl-edge),0 8px 20px var(--sh-10)}
.btn-secondary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hl-edge),0 12px 26px var(--sh-14)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;box-shadow:none;transform:none;pointer-events:none}
.btn-small{height:40px;padding-inline:20px;font-size:14px}
.text-link{display:inline-flex;align-items:center;min-height:28px;gap:8px;text-decoration:underline;text-underline-offset:5px}
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted)}
#site-header{position:relative;z-index:50}
.topbar{display:flex;align-items:center;gap:44px;height:var(--header-h);max-width:var(--max);margin:0 auto;padding:0 var(--gutter);position:relative;z-index:53}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:17px;letter-spacing:-.01em;color:var(--text);flex:none;min-height:36px}
.brand-mark{width:30px;height:30px;flex:none;display:block}
.nav{flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav li{display:flex;align-items:center;font-size:14px;color:var(--muted);white-space:nowrap}
.nav li+li::before{content:"·";margin:0 13px;color:var(--sep)}
.nav a{display:inline-flex;align-items:center;min-height:36px;transition:color var(--ease-fast)}
.nav a:hover,.nav a[aria-current="page"]{color:var(--text)}
.actions{margin-left:auto;display:flex;align-items:center;gap:22px;flex:none}
.lang{position:relative;display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--muted);white-space:nowrap}
.lang svg{width:15px;height:15px;flex:none}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:36px;padding:0;border:0;background:var(--halo-0);font-size:14px;color:var(--muted)}
.lang-name{white-space:nowrap}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 10px);z-index:60;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-panel)}
.lang.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 20px;border-radius:var(--r-pill);background:var(--panel);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hl-edge),0 6px 18px var(--sh-10);font-size:14px;font-weight:500;color:var(--text);transition:box-shadow var(--ease-fast),transform var(--ease-fast);white-space:nowrap;flex-shrink:0}
.login:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hl-edge),0 10px 24px var(--sh-14)}
.menu-button{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex:none}
.drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.footer{padding-top:64px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--bg-bottom)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;max-width:27em;color:var(--muted);font-size:14px;line-height:1.9}
.footer-title{font-size:14px;font-weight:var(--weight-medium);margin-bottom:16px}
.footer-links{display:grid;gap:8px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:96px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decorated-section{position:relative;overflow-x:clip}
@media(max-width:1399px){
  .topbar{gap:24px}
  .nav li+li::before{margin-inline:9px}
  .actions{gap:16px}
}
@media(max-width:1199px){
  .topbar{gap:18px}
  .nav li{font-size:13px}
  .nav li+li::before{margin-inline:6px}
  .actions{gap:12px}
}
@media(max-width:1023px){
  .topbar{flex-wrap:nowrap;gap:16px}
  .nav{display:none}
  .actions{margin-left:auto;gap:12px}
  .menu-button{display:inline-flex}
  .drawer{position:fixed;top:var(--header-h);left:0;right:0;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);border-top:1px solid var(--border);padding:16px var(--gutter) 32px;z-index:52}
  .drawer.is-open{display:block}
  .drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--border);font-size:15px}
  .drawer a[aria-current]{background:var(--panel-2)}
  .drawer-label{display:block;padding:24px 16px 8px;font-size:12px;color:var(--muted);font-family:var(--font-mono)}
  .menu-veil{position:fixed;inset:var(--header-h) 0 0;background:var(--veil);border:0;z-index:51}
  .menu-veil.is-open{display:block}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:16px;--display-size:38px;--section-size:30px}
  h1{font-size:var(--display-size)}
  .section{padding-top:64px;padding-bottom:64px}
  .section-head{margin-bottom:32px}
  .btn{height:48px;padding-inline:22px;font-size:15px}
  .btn-small{height:40px;padding-inline:18px;font-size:14px}
  .grid-three{grid-template-columns:1fr}
  .panel,.card{padding:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorated-section>*{max-width:100%}
  .topbar{gap:8px}
  .brand{gap:7px;font-size:15px}
  .brand-mark{width:26px;height:26px}
  .actions{margin-left:auto;gap:6px}
  .login{padding-inline:13px;font-size:13px}
  .lang-button{font-size:12px;gap:4px}
  .lang-button svg{width:13px;height:13px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 20px}
  .footer-brand{grid-column:1/-1}
  .grid-five{grid-template-columns:1fr 1fr}
}
@media(max-width:359px){
  .lang-name{max-width:4em;white-space:normal;line-height:1.3}
  .brand{font-size:14px;gap:5px}
  .login{padding-inline:10px}
  .actions{gap:4px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}