:root{
  --bg:#FBFAF8;--panel:#FFFFFF;--panel-2:#F1F0EC;--border:#E4E2DC;--border-soft:#ECEAE5;
  --accent:#1E2D2A;--accent-dark:#121B19;--accent-soft:#3D5A52;--text:#1C2220;--muted:#66706C;--faint:#8D9591;
  --success:#2F8A5B;--warn:#B9782A;--error:#C2463A;--terra:#B4533F;--on-accent:#FFFFFF;
  --atmo-ink:rgba(30,45,42,.04);--atmo-apricot:rgba(242,201,174,.34);
  --sky-1:#F2C9AE;--sky-2:#EECDB9;--sky-3:#D4CFC4;--sky-4:#B9C6C4;--sky-5:#A6B7A2;--sky-6:#8FA58C;
  --cloud:rgba(255,248,240,.58);--cloud-soft:rgba(255,246,236,.32);--haze:rgba(238,234,224,.34);--meadow-deep:rgba(92,114,88,.32);--grain:#1C2220;
  --shadow-tint:rgba(30,45,42,.10);--shadow-tint-2:rgba(30,45,42,.06);--shadow-tint-3:rgba(30,45,42,.14);
  --win-ring:rgba(30,45,42,.08);--hi-edge:rgba(255,255,255,.92);--hi-edge-soft:rgba(255,255,255,.55);--ink-hi:rgba(255,255,255,.16);
  --tag-green-wash:rgba(47,138,91,.07);--tag-green-line:rgba(47,138,91,.28);--tag-ink-wash:rgba(30,45,42,.05);--tag-ink-line:rgba(30,45,42,.20);
  --tag-amber-wash:rgba(185,120,42,.08);--tag-amber-line:rgba(185,120,42,.30);--success-wash:rgba(47,138,91,.09);--success-line:rgba(47,138,91,.30);--terra-wash:rgba(180,83,63,.04);
  --flag-red:#C63B32;--flag-white:#FFFFFF;--flag-blue:#2C3D6A;--flag-gold:#E1B23E;--flag-black:#1C2220;--flag-edge:rgba(28,34,32,.14);
  --mist-top:#E3E8E2;--mist-bottom:#BBCAC2;--veil:rgba(18,27,25,.24);--clear:transparent;
  --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","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-display:64px;--fs-body:17px;--fs-section:44px;--fs-small:14px;--weight-body:400;--weight-medium:600;--weight-bold:700;
  --r-window:12px;--r-card:8px;--r-board:16px;--r-sm:6px;--r-micro:4px;--r-grid:5px;--r-input:10px;--r-float:14px;--r-pill:999px;--r-circle:50%;
  --gutter:24px;--page-width:1360px;--reading-width:800px;--head-height:64px;--anchor-offset:80px;--toc-offset:80px;--chapter-offset:156px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-6:48px;--space-8:64px;--space-11:88px;
  --shadow-card:0 16px 40px -20px var(--shadow-tint),inset 0 1px 0 var(--hi-edge);
  --ease: .2s ease;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-body);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,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
button{border:0}
img,svg,video{max-width:100%;vertical-align:middle}
img{height:auto}
svg{flex-shrink:0}
button,a,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
:where(h1,h2,h3,p,ul,ol,figure){margin-top:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-bold);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--fs-section);line-height:1.2;letter-spacing:-.02em}
h3{font-size:24px;line-height:1.35;letter-spacing:-.01em}
p{margin-bottom:var(--space-3)}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-card);font-size:var(--fs-small)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
:where(main,section,article,div,nav,aside){min-width:0}
.wrap{width:100%;max-width:var(--page-width);padding-inline:var(--gutter);margin-inline:auto}
.reading-wrap{max-width:var(--reading-width);margin-inline:auto}
.sec{padding-top:var(--space-8);padding-bottom:var(--space-8)}
.stack{display:grid;gap:var(--space-3)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:var(--space-2)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono)}
.muted{color:var(--muted)}
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted)}
.card,.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:var(--space-3)}
.panel{border-radius:var(--r-window)}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:var(--space-8);font-size:32px}
.prose h3{margin-top:var(--space-4)}
.prose p,.prose li{line-height:1.85}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:var(--space-1)}
.skip{position:absolute;left:16px;top:-56px;z-index:60;padding:8px 14px;border-radius:var(--r-pill);background:var(--accent);color:var(--on-accent);font-size:var(--fs-small)}
.skip:focus{top:12px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.top{position:relative;overflow-x:clip;max-width:100%;isolation:isolate}
.top::before{content:"";position:absolute;inset:0 0 auto;height:760px;z-index:-1;pointer-events:none;background:linear-gradient(180deg,var(--atmo-ink),var(--clear))}
.top::after{content:"";position:absolute;inset:-140px 0 auto 54%;max-width:100%;height:660px;z-index:-1;pointer-events:none;background:radial-gradient(closest-side,var(--atmo-apricot),var(--clear))}
.site-head{position:relative;z-index:40}
.head-row{height:var(--head-height);display:flex;flex-wrap:nowrap;align-items:center;gap:32px;position:relative;z-index:43}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;font-family:var(--font-display);font-weight:var(--weight-bold);font-size:19px;letter-spacing:-.02em;color:var(--text);min-height:26px}
.brand img{width:24px;height:26px;object-fit:contain;flex-shrink:0}
.nav{flex:1;min-width:0;display:flex;justify-content:center}
.nav-list{list-style:none;margin:0;padding:0;display:flex;align-items:center;font-size:14.5px;color:var(--muted)}
.nav-list li{display:flex;align-items:center;flex-shrink:0}
.nav-list li+li::before{content:"·";margin:0 12px;color:var(--faint)}
.nav-list a{padding:6px 2px;transition:color var(--ease);white-space:nowrap}
.nav-list a:hover{color:var(--text)}
.nav-list a[aria-current="page"]{color:var(--text);font-weight:var(--weight-medium)}
.head-tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:32px;min-width:24px;width:auto;font:inherit;font-size:var(--fs-small);color:var(--muted);background:none;border:0;padding:6px 4px;white-space:nowrap}
.lang:hover{color:var(--text)}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:48;min-width:164px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:0 16px 40px var(--shadow-tint)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-small);white-space:nowrap}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--panel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;background:none;color:var(--accent);padding:10px}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 24px;border:0;border-radius:var(--r-pill);font-weight:var(--weight-medium);white-space:nowrap;flex-shrink:0;transition:transform var(--ease),box-shadow var(--ease),background-color var(--ease)}
.btn-ink,.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-dark));color:var(--on-accent);box-shadow:inset 0 1px 0 var(--ink-hi),0 1px 2px var(--shadow-tint-3),0 10px 24px -10px var(--shadow-tint-3)}
.btn-ink:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--ink-hi),0 2px 4px var(--shadow-tint-3),0 16px 32px -12px var(--shadow-tint-3)}
.btn-line,.btn-secondary{background:var(--panel);color:var(--text);box-shadow:inset 0 0 0 1px var(--border),0 1px 2px var(--shadow-tint-2)}
.btn-line:hover,.btn-secondary:hover{box-shadow:inset 0 0 0 1px var(--faint),0 4px 12px -6px var(--shadow-tint)}
.btn:active{transform:translateY(0)}
.btn-login{height:38px;min-height:38px;padding:0 20px;font-size:var(--fs-small)}
.btn-lg{height:52px;padding:0 34px;font-size:16px;letter-spacing:.01em}
.btn svg{width:16px;height:16px}
.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:120px;width:100%;max-width:100%;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
.site-footer{border-top:1px solid var(--border);background:linear-gradient(180deg,var(--atmo-ink),var(--bg));padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-6)}
.footer-brand p{margin-top:var(--space-2);max-width:340px;font-size:var(--fs-small);color:var(--muted)}
.footer-title{font-size:var(--fs-small);font-weight:var(--weight-medium);margin-bottom:var(--space-2)}
.footer-links{list-style:none;display:flex;flex-wrap:wrap;gap:8px 20px;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-small)}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:var(--space-4)}
.footer-languages a{font-size:13px;min-height:28px;display:inline-flex;align-items:center}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--border);padding-top:var(--space-3);margin-top:var(--space-4);font-size:12px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
@media(max-width:1180px){
  .head-row{gap:18px}
  .nav-list{font-size:13px}
  .nav-list li+li::before{margin-inline:8px}
}
@media(max-width:1080px){
  .nav{display:none}
  .head-tools{margin-left:auto;gap:10px}
  .menu-toggle{display:inline-flex}
  .head-row{gap:16px;justify-content:space-between}
  .mobile-drawer{position:fixed;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;z-index:42;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);font-size:16px}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2)}
  .drawer-language-title{margin:24px 12px 8px;font-size:12px;color:var(--muted);font-family:var(--font-mono)}
  .nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:41;background:var(--veil);border:0;width:100%}
  .nav-veil:not([hidden]){display:block}
}
@media(max-width:768px){
  :root{--fs-display:36px;--fs-section:30px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:var(--space-4)}
  h1{font-size:var(--fs-display)}
  .sec{padding-top:var(--space-6);padding-bottom:var(--space-6)}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .top::after{max-width:100%;inset-inline:40% 0}
  .brand{font-size:17px;gap:7px}
  .head-row{gap:8px}
  .head-tools{gap:6px;margin-left:auto}
  .lang{font-size:12px}
  .btn-login{padding-inline:14px}
  .btn-lg{height:48px;padding-inline:28px}
  .grid-five{grid-template-columns:1fr}
}
@media(max-width:359px){
  .brand{font-size:15px}
  .brand img{width:21px;height:24px}
  .head-tools{gap:2px}
  .btn-login{padding-inline:10px;font-size:13px}
  .lang{font-size:11px;padding-inline:2px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}