:root{
  color-scheme:light;
  --bg:#E6EBF3;
  --bg-hi:#EDF1F7;
  --bg-lo:#DCE3EE;
  --panel:#F7F9FD;
  --panel-2:#D9E1EE;
  --surface:#FFFFFF;
  --select:#EDF1F7;
  --border:#CCD5E3;
  --border-soft:#E3E8F1;
  --border-strong:#AEB9CB;
  --accent:#C8414B;
  --accent-dark:#9E2F39;
  --coral:#E07A62;
  --periwinkle:#6E82CF;
  --text:#1F2533;
  --muted:#5A6478;
  --faint:#8A94A8;
  --line-art:#A3AFC4;
  --line-fill:#EEF2F8;
  --success:#2E8A5C;
  --success-hi:#3AA06D;
  --warn:#B9821A;
  --error:#B3261E;
  --on-ink:#FFFFFF;
  --graphite-1:#2A2F3A;
  --graphite-2:#232833;
  --side-text:#C3CAD6;
  --side-strong:#F2F4F8;
  --side-faint:#7F8899;
  --side-hover:rgba(255,255,255,.09);
  --side-well:rgba(255,255,255,.05);
  --flag-red:#C8414B;
  --flag-blue:#34478A;
  --flag-white:#FFFFFF;
  --rose-04:rgba(200,65,75,.04);
  --rose-10:rgba(200,65,75,.10);
  --rose-14:rgba(200,65,75,.14);
  --peri-07:rgba(110,130,207,.07);
  --ink-06:rgba(31,37,51,.06);
  --ink-10:rgba(31,37,51,.10);
  --ink-18:rgba(31,37,51,.18);
  --veil-color:rgba(31,37,51,.32);
  --hl:rgba(255,255,255,.72);
  --hl-soft:rgba(255,255,255,.22);
  --clear:transparent;
  --r-code:5px;
  --r-xs:6px;
  --r-nav:7px;
  --r-sm:8px;
  --r-md:10px;
  --r-lg:12px;
  --r-win:14px;
  --r-flag:3px;
  --r-flag-lg:4px;
  --r-pill:999px;
  --r-circle:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",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","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --shadow-win:0 56px 96px -36px var(--rose-14),0 26px 52px -26px var(--rose-10),0 0 0 1px var(--ink-06);
  --shadow-float:0 18px 40px -16px var(--rose-14),0 3px 8px var(--ink-06);
  --shadow-panel:0 24px 60px -32px var(--rose-14),inset 0 1px 0 var(--hl);
  --gutter:24px;
  --content-width:1200px;
  --reading-width:820px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:136px;
  --ease-time:.2s;
  --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:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.6vw,66px);line-height:1.1;font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(26px,3vw,36px);line-height:1.25;font-weight:750;letter-spacing:-.015em}
h3{font-size:22px;line-height:1.35;font-weight:700}
p{overflow-wrap:break-word}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent-dark)}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button:disabled,[aria-disabled="true"]{cursor:not-allowed}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
ul,ol{padding-left:1.4em}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
::selection{background:var(--panel-2);color:var(--text)}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:72px;padding-bottom:72px}
.stack{display:grid;gap:24px}
.stack>*{min-width:0}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.split-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.split-grid>*{min-width:0}
.section-head{margin-bottom:28px}
.section-head p{margin-top:12px;max-width:720px;color:var(--muted)}
.eyebrow{font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--accent-dark);margin-bottom:10px}
.lead{font-size:20px;line-height:1.65;color:var(--muted)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel{min-width:0;padding:28px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow-panel)}
.panel-soft{background:var(--panel)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.card-grid>*{min-width:0}
.btn,.btn-secondary,.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border:1px solid var(--border-strong);border-radius:var(--r-md);font-size:15px;font-weight:650;line-height:1.4;text-align:center;white-space:nowrap;flex-shrink:0;transition:background-color var(--ease-time),border-color var(--ease-time),color var(--ease-time)}
.btn,.btn-secondary{background:var(--surface);color:var(--text)}
.btn-primary{background:var(--text);border-color:var(--text);color:var(--on-ink);box-shadow:0 10px 24px -14px var(--rose-14)}
.btn:hover,.btn-secondary:hover{border-color:var(--accent-dark);color:var(--accent-dark)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark);border-color:var(--accent-dark);color:var(--on-ink)}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);border-color:var(--border);color:var(--muted);box-shadow:none}
.btn svg,.btn-primary svg,.btn-secondary svg{width:18px;height:18px}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose .table-scroll{margin-block:18px}
.prose h2{margin-top:48px;margin-bottom:18px}
.prose h3{margin-top:30px;margin-bottom:14px}
.prose li+li{margin-top:8px}
.prose a:not(.btn):not(.btn-primary):not(.btn-secondary):not(.toc-tabs a){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel);border-radius:var(--r-code);padding:2px 5px}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:20px;background:var(--graphite-2);color:var(--side-strong);border-radius:var(--r-md);-webkit-overflow-scrolling:touch}
pre code{padding:0;background:var(--clear);color:inherit;white-space:pre;overflow-wrap:normal}
section[id],h2[id],h3[id]{scroll-margin-top:var(--anchor-offset)}
.decorated{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.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}

/* Shared header: no transformed or filtered ancestors of the drawer. */
#site-header{position:relative;z-index:60;min-height:var(--header-height)}
.topbar{position:relative;z-index:60;background:var(--bg-hi)}
.topbar-in{max-width:1200px;margin:0 auto;padding:0 24px;height:var(--header-height);display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.01em;color:var(--text);flex-shrink:0;white-space:nowrap}
.brand-mark{display:block;width:32px;height:32px;filter:drop-shadow(0 4px 8px var(--rose-14));flex-shrink:0}
.brand-zh{font-weight:500;color:var(--muted);font-size:14px}
.mainnav{margin-left:auto;flex:1;min-width:0}
.dotsep{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0;gap:0}
.dotsep li{display:flex;align-items:center;white-space:nowrap;min-width:0}
.dotsep li+li::before{content:"·";color:var(--faint);margin:0 8px;font-weight:700}
.dotsep a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;font-weight:500;color:var(--muted);padding:6px 2px;transition:color var(--ease-time)}
.dotsep a:hover{color:var(--accent-dark)}
.dotsep a[aria-current="page"]{color:var(--text);font-weight:650}
.topbar-tools{display:flex;align-items:center;gap:8px;margin-left:0;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 8px;border:0;background:var(--clear);border-radius:var(--r-sm);color:var(--muted);font:500 13px/1 var(--font-body);cursor:pointer;white-space:nowrap;list-style:none}
.lang::-webkit-details-marker{display:none}
.lang svg{width:16px;height:16px}
.lang-t{white-space:nowrap}
.lang:hover{background:var(--panel)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:90;min-width:176px;padding:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs);font-size:14px;white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--select);color:var(--accent-dark)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;height:36px;min-width:56px;padding:0 14px;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);border-radius:var(--r-sm);font-size:14px;font-weight:650;white-space:nowrap;box-shadow:0 4px 10px -6px var(--rose-14)}
.login-btn:hover{border-color:var(--accent-dark);color:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--clear);color:var(--text);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.nav-drawer{display:none;position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:20px var(--gutter) 40px;z-index:75;border-top:1px solid var(--border)}
.drawer-list{list-style:none;padding:0;margin:0}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);color:var(--text)}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--panel-2);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--veil-color);z-index:65}
.site-footer{padding-top:56px;padding-bottom:28px;background:var(--panel);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;margin-top:18px;color:var(--muted);font-size:14px}
.footer-title{font-size:14px;font-weight:700;margin-bottom:14px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:13px;color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:20px;color:var(--muted);font-size:12px}
.footer-legal{display:flex;gap:20px}
@media(max-width:1280px){
  .topbar-in{gap:14px}
  .dotsep li+li::before{margin:0 6px}
  .dotsep a{font-size:13px}
  .lang{padding-inline:6px;font-size:12px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .nav-drawer.is-open{display:block}
}
@media(max-width:768px){
  :root{--gutter:16px}
  h1{font-size:34px;line-height:1.18}
  h2{font-size:28px}
  h3{font-size:21px}
  .sec{padding-top:48px;padding-bottom:48px}
  .lead{font-size:18px}
  .card-grid,.split-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .panel{padding:20px}
  .topbar-in{padding-inline:16px;gap:8px}
  .topbar-tools{gap:4px;margin-left:auto}
  .brand{font-size:17px;gap:7px}
  .brand-mark{width:28px;height:28px}
  .lang-t{display:none}
  .login-btn{padding-inline:10px;min-width:50px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.micro-tilt{transform:none}
  .decorated{max-width:100%}
  .brand-zh{display:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}