:root{
  --bg:#E8ECF8;--bg-top:#F2F4FC;--bg-bottom:#E1E6F5;--panel:#F6F8FE;--panel-2:#DCE2F3;--white:#FFFFFF;
  --border:#CBD3EA;--border-soft:rgba(203,211,234,.72);--rail:rgba(160,171,210,.55);
  --accent:#E5486B;--accent-dark:#B92E50;--accent-glow:rgba(229,72,107,.45);
  --text:#161B33;--muted:#5A6384;--faint:#8790B0;--success:#1E9E6A;--success-soft:rgba(30,158,106,.32);--warn:#D98A12;--error:#D2343E;
  --apricot:#FFB067;--apricot-soft:rgba(255,176,103,.24);--apricot-glow:rgba(255,176,103,.6);--rose:#F7A1B4;--peri:#8F9CF2;
  --prism-a:#FFC48A;--prism-b:#F7A1B4;--prism-c:#A9B4F7;--prism-a-d:#E0AC79;--prism-b-d:#D98E9E;--prism-c-d:#959ED9;
  --hi:#FFFFFF;--hi-soft:rgba(255,255,255,.55);--hover-tint:rgba(255,255,255,.72);
  --ink-win:#1A1F38;--ink-win-2:#242A49;--ink-line:rgba(255,255,255,.07);--ink-line-strong:rgba(255,255,255,.16);--ink-shadow:rgba(26,31,56,.42);--ink-tint:#161B33;
  --on-ink:#FFFFFF;--on-ink-muted:rgba(231,234,248,.68);
  --code-key:#A9B4F7;--code-str:#FFB067;--code-const:#F7A1B4;--code-id:#E7EAF8;--code-punct:#7C85A9;--code-ln:#4C5476;--code-tag-bg:rgba(169,180,247,.14);
  --peri-shadow:rgba(143,156,242,.10);--peri-shadow-2:rgba(143,156,242,.22);--peri-shadow-3:rgba(110,122,210,.34);
  --groove-shade:rgba(22,27,51,.09);--glow-apricot:rgba(255,176,103,.16);--glow-rose:rgba(247,161,180,.07);
  --sky-rose:rgba(247,161,180,.26);--sky-warm:rgba(255,176,103,.42);--sun-halo:rgba(255,196,138,.34);--ridge-deep:#2A3160;
  --flag-red:#D52B3A;--flag-white:#FFFFFF;--flag-navy:#28367E;--flag-blue:#2D4FA6;--flag-edge:rgba(22,27,51,.16);
  --veil:rgba(22,27,51,.35);
  --r-xs:6px;--r-s:8px;--r-m:10px;--r-l:12px;--r-xl:20px;--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","Yu Gothic","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --shadow-panel:inset 0 1px 0 var(--hi),0 2px 6px var(--peri-shadow),0 22px 46px -18px var(--peri-shadow-3);
  --shadow-panel-hover:inset 0 1px 0 var(--hi),0 8px 16px var(--peri-shadow),0 26px 50px -16px var(--peri-shadow-3);
  --shadow-win:0 34px 64px -26px var(--ink-shadow),0 18px 44px -14px var(--peri-shadow-3);
  --container:1248px;--reading:800px;--gutter:32px;--bar-h:68px;--toc-offset:88px;--section-gap:72px;
  --display-size:64px;--h2-size:36px;--h3-size:22px;--body-size:16px;--small-size:14px;--ease:.16s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--bar-h) + 16px);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;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--apricot-soft)}
:focus-visible{outline:2px solid var(--muted);outline-offset:3px}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button svg,a svg{flex-shrink:0}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1,.h1{margin:0 0 20px;font-size:var(--display-size);font-weight:800;line-height:1.1;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:var(--h2-size);font-weight:800;line-height:1.25;letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:var(--h3-size);line-height:1.4;font-weight:700}
p{margin:0 0 20px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--ink-win);color:var(--code-id);border-radius:var(--r-l);font-family:var(--font-mono)}
pre code{white-space:pre;overflow-wrap:normal}
.no-break{white-space:nowrap}
.muted{color:var(--muted);font-weight:400}
.h1-key{color:var(--accent)}
.wrap{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.page{position:relative;overflow-x:clip;max-width:100%}
.page::before{content:"";position:absolute;top:calc(var(--bar-h) + 1px);bottom:0;left:50%;width:min(var(--container),100%);transform:translateX(-50%);border-inline:1px solid var(--rail);pointer-events:none;z-index:1}
main,section,article,aside,nav,div{min-width:0}
.panel{padding:32px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-xl);box-shadow:var(--shadow-panel)}
.panel-lift{transition:transform var(--ease),box-shadow var(--ease)}
.panel-lift:hover{transform:translateY(-2px);box-shadow:var(--shadow-panel-hover)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;border:1px solid transparent;border-radius:var(--r-m);font-family:var(--font-body);font-size:15.5px;font-weight:600;line-height:1.3;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform var(--ease),background-color var(--ease),border-color var(--ease),box-shadow var(--ease)}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{background:var(--accent);color:var(--on-ink);box-shadow:inset 0 1px 0 var(--ink-line-strong),0 12px 24px -12px var(--accent-glow)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--white);color:var(--text);border-color:var(--border)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--faint);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn[aria-disabled="true"]{pointer-events:none}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:36px}
.topbar{position:relative;z-index:60;background:var(--bg-top);border-bottom:1px solid var(--border)}
.topbar-in{display:flex;align-items:center;flex-wrap:nowrap;height:var(--bar-h);gap:8px}
.brand{display:inline-flex;align-items:center;gap:10px;margin-right:32px;text-decoration:none;color:var(--text);flex:none}
.brand-mark{width:32px;height:32px;flex:none;filter:drop-shadow(0 6px 10px var(--peri-shadow-2))}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:18px;letter-spacing:-.02em;line-height:1}
.nav{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-list a,.more-btn{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:8px 12px;border:0;border-radius:var(--r-s);background:none;font-family:var(--font-body);font-size:14.5px;font-weight:500;line-height:1.25;color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.nav-list a:hover,.more-btn:hover{color:var(--text);background:var(--hover-tint)}
.nav-list a[aria-current="page"],.more-btn.is-current{color:var(--text);font-weight:600}
.more{position:relative}
.more-btn{gap:4px}
.more-menu{position:absolute;top:calc(100% + 8px);left:0;z-index:65;min-width:248px;padding:6px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-l);box-shadow:var(--shadow-panel);display:none}
.more-menu::before{content:"";position:absolute;inset:-10px 0 auto;height:10px}
.more.is-open .more-menu{display:block}
.nav-list .more-menu a{display:grid;justify-content:stretch;gap:3px;height:auto;padding:10px 12px}
.more-menu b{font-size:14px;font-weight:600;color:var(--text)}
.more-menu span{font-size:12px;color:var(--muted)}
.bar-end{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:8px 12px;border:0;border-radius:var(--r-s);background:none;color:var(--muted);font-family:var(--font-body);font-size:14px;font-weight:500;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text);background:var(--hover-tint)}
.lang svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.7}
.lang-menu{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:180px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-l);box-shadow:var(--shadow-panel);display:none}
.language.is-open .lang-menu{display:block}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:var(--r-s);text-decoration:none;font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 18px;border-radius:var(--r-s);background:var(--text);color:var(--on-ink);font-size:14.5px;font-weight:600;line-height:1.25;white-space:nowrap;text-decoration:none;box-shadow:inset 0 1px 0 var(--ink-line-strong),0 8px 16px -10px var(--ink-shadow);transition:transform var(--ease)}
.login:hover{transform:translateY(-1px)}
.burger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-s);background:var(--panel);color:var(--text)}
.burger svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.nav-drawer{display:none;position:fixed;inset:var(--bar-h) 0 auto;z-index:55;height:calc(100dvh - var(--bar-h));max-height:calc(100dvh - var(--bar-h));padding:20px var(--gutter) 40px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-s);text-decoration:none}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--panel-2)}
.drawer-label{margin:20px 16px 8px;color:var(--muted);font-size:var(--small-size)}
.nav-veil{display:none;position:fixed;inset:var(--bar-h) 0 0;z-index:50;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{position:relative;z-index:2;padding-top:48px;padding-bottom:32px;border-top:1px solid var(--border);background:var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer-brand .brand{margin:0 0 20px}
.footer-brand p{max-width:28em;color:var(--muted);font-size:14px}
.footer-title{margin-bottom:14px;font-size:14px;font-weight:700}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-bottom a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover,.footer-languages a:hover,.footer-bottom a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-bottom{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;max-width:100%;min-width:0;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
.stat-number,[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.decor-section{position:relative;overflow-x:clip}
@media(min-width:961px){
  .more:hover .more-menu{display:block}
}
@media(max-width:1180px){.brand{margin-right:16px}.nav-list a,.more-btn{padding-inline:9px}}
@media(max-width:1100px){:root{--display-size:56px}}
@media(max-width:960px){
  .nav{display:none}.burger{display:inline-flex}.bar-end{margin-left:auto}
  html.nav-open .nav-drawer{display:block}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--display-size:38px;--h2-size:28px;--section-gap:48px;--gutter:24px}
  .footer-grid{gap:24px}
}
@media(max-width:640px){
  :root{--gutter:16px;--display-size:36px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-section{max-width:100%}
  .brand{gap:7px;margin-right:0}.brand-en{font-size:16px}.brand-mark{width:28px;height:28px}
  .bar-end{gap:4px;margin-left:auto}.lang{padding-inline:7px;font-size:12px}.lang svg{display:none}
  .login{padding-inline:12px;font-size:13px}.topbar-in{gap:4px}
  .footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}
  .panel{padding:24px}
}
@media(max-width:359px){
  .brand-en{font-size:14px}.brand-mark{width:24px;height:24px}.lang{font-size:11px;padding-inline:4px}.login{padding-inline:9px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}