:root{
  --bg:#E6E5F8;
  --bg-top:#EEEDFC;
  --bg-bottom:#DFDDF5;
  --panel:#F8F7FE;
  --panel-2:#D9D7F1;
  --groove-soft:#EEEDFB;
  --border:#C4C2E6;
  --border-soft:rgba(196,194,230,.72);
  --accent:#3A33D6;
  --accent-dark:#241E9E;
  --accent-hi:#7C76F4;
  --teal:#14C9B8;
  --text:#14123A;
  --muted:#585677;
  --success:#0F9F7E;
  --warn:#B9720C;
  --error:#CF3A4C;
  --ink:#14123A;
  --ink-2:#1A1748;
  --ink-85:rgba(20,18,58,.86);
  --white:#FFFFFF;
  --on-dark:#EEEDFC;
  --on-dark-muted:rgba(238,237,252,.62);
  --on-dark-line:rgba(238,237,252,.14);
  --on-dark-dash:rgba(238,237,252,.2);
  --json-key:#B9B5F5;
  --hi-line:rgba(255,255,255,.92);
  --hi-soft:rgba(255,255,255,.24);
  --hdr-bg:rgba(248,247,254,.74);
  --panel-glass:rgba(248,247,254,.68);
  --hover:rgba(58,51,214,.06);
  --dot:rgba(36,30,158,.08);
  --shadow-tint:rgba(58,51,214,.12);
  --shadow-tint-strong:rgba(58,51,214,.2);
  --shadow-cta:rgba(58,51,214,.45);
  --shadow-ink:rgba(20,18,58,.35);
  --accent-glow:rgba(124,118,244,.55);
  --teal-line:rgba(20,201,184,.72);
  --teal-ring:rgba(20,201,184,.1);
  --teal-glow:rgba(20,201,184,.34);
  --success-soft:rgba(15,159,126,.16);
  --flag-red:#E0303E;
  --flag-white:#FFFFFF;
  --flag-blue:#2A3A8C;
  --flag-green:#1E9A58;
  --flag-ring:rgba(20,18,58,.14);
  --transparent:transparent;
  --mask-solid:#000000;
  --radius-s:6px;
  --radius:8px;
  --radius-l:10px;
  --radius-depth:12px;
  --radius-mark:9px;
  --radius-flag:3px;
  --radius-line:2px;
  --radius-pill:999px;
  --radius-round:50%;
  --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","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:64px;
  --content-width:1440px;
  --anchor-offset:84px;
  --toc-offset:96px;
  --ease-out:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:16px;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{background:none;border:0;padding:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex:none}
a,button,summary{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4,p{overflow-wrap:break-word}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,4.6vw,68px);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:900;line-height:1.2;letter-spacing:-.02em}
h3{font-size:22px;font-weight:800;line-height:1.35}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--groove-soft);font-family:var(--font-mono);font-size:14px}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*,:where(.grid,.hero-in,.win-body,.footer-grid)>*{min-width:0}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head h2{margin-top:0;margin-bottom:16px}
.section-head p{color:var(--muted)}
.reading-wrap{max-width:900px;margin-inline:auto}
.prose{min-width:0;overflow-wrap:anywhere}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a,.text-link{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.prose a{color:var(--accent-dark)}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--radius-l);box-shadow:inset 0 1px 0 var(--hi-line),0 24px 48px -28px var(--shadow-tint-strong)}
.panel{padding:24px}
.card{padding:28px}
.badge,.tag{display:inline-flex;align-items:center;gap:7px;min-height:28px;max-width:100%;padding:4px 10px;border-radius:var(--radius-s);background:var(--groove-soft);border:1px solid var(--border-soft);color:var(--text);font-size:12px;font-weight:700;overflow-wrap:anywhere}
.badge-dot{width:7px;height:7px;flex-shrink:0;border-radius:var(--radius-round);background:var(--success)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:52px;padding:0 26px;border-radius:var(--radius);font-size:16px;font-weight:800;letter-spacing:.01em;white-space:nowrap;flex-shrink:0;transition:transform .15s,box-shadow .15s,background-color .15s}
.btn-primary{color:var(--white);background:linear-gradient(135deg,var(--accent),var(--accent-dark));box-shadow:inset 0 1px 0 var(--hi-soft),0 16px 30px -12px var(--shadow-cta)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hi-soft),0 20px 34px -12px var(--shadow-cta)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost,.btn-secondary{color:var(--text);background:var(--panel-glass);border:1.5px solid var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;box-shadow:none;transform:none}
.btn-small{height:44px;padding-inline:18px;font-size:14px}
.btn-icon{min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center}
.ann{background:var(--ink);color:var(--on-dark);font-size:13px;line-height:1}
.ann .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:36px}
.ann-msg{display:flex;align-items:center;gap:14px;min-width:0}
.ann-label{color:var(--on-dark-muted);font-weight:600;flex:none}
.ann-text{font-weight:500}
.ann-link{display:inline-flex;align-items:center;gap:8px;min-height:24px;color:var(--teal);font-weight:700;flex:none}
.ann-link:hover{text-decoration:underline;text-underline-offset:3px}
.ann-side{color:var(--on-dark-muted);white-space:nowrap}
.hdr{position:relative;z-index:30;background:var(--hdr-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border-soft)}
.hdr .wrap{position:relative;display:flex;align-items:center;gap:36px;height:68px}
.brand{display:flex;align-items:center;gap:12px;flex:none;min-height:40px}
.brand-mark{width:34px;height:34px;border-radius:var(--radius-mark);box-shadow:0 8px 16px -6px var(--shadow-cta)}
.brand-en{font-family:var(--font-display);font-size:20px;font-weight:900;letter-spacing:-.02em}
.brand-zh{padding-left:12px;border-left:1px solid var(--border);font-size:13px;font-weight:500;color:var(--muted)}
.nav{display:flex;align-items:center;gap:2px}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link{position:relative;display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 14px;border-radius:var(--radius-s);font-size:15px;font-weight:600;color:var(--text)}
.nav-link:hover{background:var(--hover)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;border-radius:var(--radius-line);background:var(--text)}
.nav-more{position:relative}
.nav-menu{position:absolute;top:calc(100% + 10px);left:0;display:grid;min-width:232px;padding:8px;background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--radius-l);box-shadow:inset 0 1px 0 var(--hi-line),0 24px 48px -18px var(--shadow-tint-strong)}
.nav-menu a{display:flex;flex-direction:column;gap:2px;min-height:44px;padding:10px 12px;border-radius:var(--radius-s)}
.nav-menu a:hover,.nav-menu a[aria-current="page"]{background:var(--hover)}
.nav-menu b{font-size:14px;font-weight:700}
.nav-menu span{font-size:12px;color:var(--muted)}
.hdr-right{display:flex;align-items:center;gap:10px;margin-left:auto}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:44px;width:auto;height:38px;padding:0 12px;border-radius:var(--radius-s);font-size:14px;font-weight:600;color:var(--muted);white-space:nowrap}
.lang:hover{background:var(--hover);color:var(--text)}
.lang-menu{right:0;left:auto;min-width:180px}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 20px;border-radius:var(--radius);border:1.5px solid var(--text);font-size:14px;font-weight:800;color:var(--text);white-space:nowrap}
.btn-login:hover{background:var(--text);color:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--radius-s)}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:104px 0 0;z-index:29;background:var(--shadow-ink)}
.footer{padding-top:56px;padding-bottom:28px;background:var(--ink);color:var(--on-dark)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr .75fr;gap:40px}
.footer .brand{width:max-content;max-width:100%}
.footer p{color:var(--on-dark-muted);font-size:14px;max-width:30em}
.footer h2{font-size:15px;font-weight:800;letter-spacing:0;margin:0 0 16px}
.footer ul{display:grid;gap:8px;list-style:none;margin:0;padding:0}
.footer li{min-width:0}
.footer li a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer a:hover{text-decoration:underline;text-underline-offset:4px}
.footer :focus-visible{outline-color:var(--on-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--on-dark-line);font-size:13px;color:var(--on-dark-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{min-height:24px}
.reveal{transition:opacity .65s var(--ease-out),transform .65s var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;max-width:100%;min-height:48px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.decor-section{position:relative;overflow-x:clip;max-width:100%}
.toc-static{position:static!important}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media(max-width:1100px){
  :root{--gutter:40px}
  .brand-zh{display:none}
  .hdr .wrap{gap:20px}
}
@media(max-width:960px){
  .nav{display:none}
  .menu-toggle{display:inline-flex}
  .hdr-right{margin-left:auto}
  .ann-side{display:none}
  .mobile-drawer:not([hidden]){display:block;position:absolute;left:var(--gutter);right:var(--gutter);top:100%;z-index:32;max-height:calc(100dvh - 116px);overflow-y:auto;overscroll-behavior:contain;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-l);box-shadow:0 24px 48px -18px var(--shadow-tint-strong)}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 14px;border-radius:var(--radius-s);font-size:14px;font-weight:600}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--hover)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:38px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .section{padding-top:48px;padding-bottom:48px}
}
@media(max-width:640px){
  :root{--gutter:20px;--anchor-offset:80px;--toc-offset:88px}
  .no-break{white-space:normal}
  .ann-label{display:none}
  .ann-msg{gap:8px;flex-wrap:wrap;padding-block:7px}
  .ann-text{font-size:11px}
  .ann-link{font-size:11px}
  .hdr .wrap{gap:8px}
  .brand{gap:8px}
  .hdr-right{gap:6px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px}
  .btn-login{padding-inline:12px}
  .brand-en{font-size:18px}
  .brand-mark{width:30px;height:30px}
  .card,.panel{padding:20px}
  .footer-grid{gap:28px}
  .footer-grid>:first-child{grid-column:1/-1}
  .tilt,.decor-tilt,[data-tilt]{transform:none!important}
  .decor-section{max-width:100%;overflow-x:clip}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .hdr-right .lang>span{display:none}
  .brand-en{font-size:16px}
  .brand-mark{width:28px;height:28px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}