:root{
  --bg:#E4EFF5;--bg-top:#EEF5FA;--bg-bottom:#DCE8F1;
  --panel:#F6FAFD;--panel-2:#D6E5EE;--white:#FFFFFF;
  --border:#C3D3E0;--border-soft:#DDE7EF;
  --accent:#2846E8;--accent-dark:#1A2FB0;--marigold:#F2B705;
  --text:#141B2D;--muted:#56637A;--faint:#8592A6;
  --success:#1F9D5C;--success-soft:rgba(31,157,92,.16);--warn:#C98300;--error:#D23B3B;
  --mint:#D4F0DF;--mint-edge:#9FD2B4;--mint-ink:#1D6A44;
  --sky:#D5E8F8;--sky-edge:#98C3E6;--sky-ink:#1E4E7A;
  --cream:#FBEFC2;--cream-edge:#E3CB76;--cream-ink:#73560A;
  --blush:#F9D8E1;--blush-edge:#E7A6B8;--blush-ink:#8C2E4A;
  --line:#93A1B5;--dot:rgba(24,38,92,.13);--dot-soft:rgba(24,38,92,.08);
  --glow-peri:rgba(140,132,242,.26);--glow-apricot:rgba(255,176,118,.26);
  --tint-06:rgba(40,70,232,.06);--tint-10:rgba(40,70,232,.10);--tint-18:rgba(40,70,232,.18);
  --hi:rgba(255,255,255,.62);--hi-soft:rgba(255,255,255,.28);
  --lo:rgba(20,27,45,.05);--ink-shadow:rgba(20,27,45,.28);
  --glass:rgba(246,250,253,.80);--mask:#000;--clear:transparent;
  --flag-red:#D9303B;--flag-white:#FFFFFF;--flag-navy:#1B2A6B;--flag-blue:#253B8E;--flag-edge:rgba(20,27,45,.22);
  --r-xs:4px;--r-sm:6px;--r:8px;--r-md:10px;--r-xl:24px;--r-pill:999px;--r-round:50%;--r-tape:2px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --size-body:15px;--size-small:13px;--size-h1:clamp(52px,4.45vw,64px);--size-h2:32px;--size-h3:22px;
  --weight-body:400;--weight-medium:500;--weight-strong:600;
  --gutter:32px;--content:1184px;--header-height:64px;--anchor-gap:80px;--toc-offset:144px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-section:72px;
  --ease:cubic-bezier(.2,.7,.3,1);--quick:.18s;--reveal-time:.55s;
  --shadow-panel:0 1px 2px var(--tint-06),0 10px 24px -12px var(--tint-10),0 40px 90px -24px var(--tint-10);
  --shadow-small:0 10px 24px -16px var(--tint-18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-body);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
ul{list-style:none}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-medium);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--size-h2);line-height:1.3;letter-spacing:-.01em}
h3{font-size:var(--size-h3);line-height:1.4}
p{overflow-wrap:break-word}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-title{margin-bottom:var(--space-3)}
.stack>*+*{margin-top:var(--space-2)}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split>*{min-width:0}
.cluster{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.cluster>*{min-width:0}
.mono,code,pre{font-family:var(--font-mono)}
.muted{color:var(--muted)}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.prose{max-width:820px;line-height:1.85}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-bottom:20px}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:12px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px;font-size:.9em}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:20px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r)}
pre code{background:none;padding:0;white-space:pre;overflow-wrap:normal}
.btn,.btn-primary,.btn-secondary,.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border:1px solid var(--border);border-radius:var(--r);font-weight:var(--weight-medium);white-space:nowrap;flex-shrink:0;transition:background-color var(--quick),border-color var(--quick),transform var(--quick)}
.btn{background:var(--white);color:var(--text)}
.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent) 45%,var(--accent-dark) 140%);color:var(--white);border-color:var(--accent);border-radius:var(--r-pill);box-shadow:inset 0 1px 0 var(--hi-soft),0 8px 16px -8px var(--accent)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-secondary{background:var(--text);color:var(--white);border-color:var(--text)}
.btn:hover,.login:hover{border-color:var(--accent)}
.btn-secondary:hover{transform:translateY(-1px)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled{opacity:.5;transform:none}
.panel,.card{min-width:0;padding:24px;border:1px solid var(--border);border-radius:var(--r);background:var(--panel);box-shadow:inset 0 1px 0 var(--hi),var(--shadow-small)}
.card{background:var(--white)}
.badge{display:inline-flex;align-items:center;gap:8px;min-height:28px;padding:2px 14px 2px 10px;border-radius:var(--r-pill);background:var(--white);border:1px solid var(--border);font-size:var(--size-small);font-weight:var(--weight-medium);box-shadow:0 6px 14px -10px var(--tint-18);max-width:100%;overflow-wrap:anywhere}
.badge-dot{width:8px;height:8px;border-radius:var(--r-round);background:var(--success);box-shadow:0 0 0 3px var(--success-soft);flex-shrink:0}
.topbar,#site-header{position:sticky;top:0;z-index:40;min-height:var(--header-height)}
.topbar{height:var(--header-height);background:var(--glass);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.topbar-in{max-width:1312px;height:100%;margin:auto;padding-inline:32px;display:flex;align-items:center;gap:40px}
.brand{display:flex;align-items:center;gap:10px;min-height:38px;flex-shrink:0}
.brand img{width:32px;height:32px}
.brand-en{font-size:18px;font-weight:var(--weight-strong);letter-spacing:-.01em}
.brand-zh{font-size:14px;color:var(--muted);font-weight:var(--weight-body)}
.mainnav{display:flex;align-items:center}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a,.more-btn{display:flex;align-items:center;gap:6px;min-height:36px;padding:6px 12px;border-radius:var(--r-sm);font-size:15px;background:none;border:0;cursor:pointer}
.mainnav a:hover,.more-btn:hover,.mainnav a[aria-current="page"],.more-btn.is-active{background:var(--panel-2)}
.more{position:relative;list-style:none}
.more-btn{list-style:none}
.more-btn::-webkit-details-marker{display:none}
.more-caret{font-size:11px;color:var(--muted)}
.more-menu,.lang-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:168px;padding:6px;background:var(--white);border:1px solid var(--border);border-radius:var(--r);box-shadow:0 18px 40px -18px var(--tint-18);z-index:45}
.more-menu a,.lang-menu a{display:flex;align-items:center;min-height:36px;padding:8px 10px;border-radius:var(--r-sm);font-size:14px}
.more-menu a:hover,.lang-menu a:hover{background:var(--panel)}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:36px;width:auto;padding:6px 10px;border-radius:var(--r-sm);font-size:14px;color:var(--muted);background:none;border:0;cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2)}
.lang-menu{left:auto;right:0}
.lang-menu a[aria-current]{font-weight:var(--weight-strong);background:var(--panel-2)}
.login{min-height:38px;padding:7px 18px;background:var(--white);font-size:14.5px;box-shadow:inset 0 1px 0 var(--hi),0 4px 10px -6px var(--tint-18)}
.nav-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r);background:var(--white);font-size:22px}
.mobile-nav{display:none}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--ink-shadow);z-index:39;border:0;width:100%}
html.nav-open{overflow:hidden}
.site-footer{padding-top:48px;padding-bottom:32px;border-top:1px solid var(--border);background:linear-gradient(180deg,var(--panel),var(--bg-bottom))}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:340px;color:var(--muted);margin-top:16px}
.footer-title{font-size:15px;font-weight:var(--weight-medium);margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 16px}
.footer-links a,.footer-languages a,.footer-bottom a{display:inline-flex;align-items:center;min-height:28px;font-size:13px}
.footer-links a:hover,.footer-languages a:hover,.footer-bottom a:hover{text-decoration:underline;text-underline-offset:3px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;padding-top:24px;margin-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:24px;color:var(--muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.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}
.counter-stat,[data-counter]{font-family:var(--font-mono);font-variant-numeric:tabular-nums;display:inline-block;min-width:3ch;text-align:right}
#server-status{position:static;display:block;min-height:120px;width:100%;max-width:100%;min-width:0;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>*{min-width:0;max-width:100%}
.decor-section{position:relative;overflow-x:clip}
@media(max-width:1100px){.topbar-in{gap:24px}}
@media(max-width:860px){
  .topbar-in{padding-inline:16px;gap:12px}
  .mainnav,.brand-zh{display:none}
  .top-actions{margin-left:auto;gap:4px}
  .lang-txt{display:none}
  .nav-toggle{display:inline-flex}
  .mobile-nav:not([hidden]){display:block;position:absolute;left:0;right:0;top:var(--header-height);background:var(--panel);border-bottom:1px solid var(--border);padding:12px 16px;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:46}
  .mobile-nav a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-sm)}
  .mobile-nav a:hover,.mobile-nav a[aria-current="page"]{background:var(--panel-2)}
  .mobile-languages{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}
}
@media(max-width:768px){
  :root{--gutter:16px;--size-h1:clamp(28px,7vw,40px);--size-h2:26px;--size-h3:20px;--space-section:48px}
  .split{grid-template-columns:1fr;gap:24px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.note,.tray span{transform:none!important}
  .decor-section,.decor-section>*{max-width:100%}
  .panel,.card{padding:20px}
  .login{padding-inline:12px}
  .brand-en{font-size:16px}
  .topbar-in{gap:8px}
  .prose{width:100%;min-width:0}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}