:root{
  --bg:#F3F3F1;
  --panel:#FFFFFF;
  --panel-2:#ECEBEF;
  --border:#E1DFE6;
  --accent:#9B3DBF;
  --accent-dark:#6E2690;
  --accent-hi:#B055D2;
  --text:#26222D;
  --text-muted:#5F5A69;
  --ink:#3A2C4A;
  --success:#2E9B6E;
  --warn:#D98A1C;
  --error:#D2414F;
  --sky-peach:#FCEBDD;
  --sky-blue:#DCEEF7;
  --sky-mint:#D6F2EB;
  --mist:#C4EADF;
  --mist-2:#B3E3D6;
  --hill-1:#A9E1D2;
  --hill-2:#62C1AC;
  --pine:#2F9C8B;
  --pine-deep:#23806F;
  --teal:#3AAE98;
  --teal-edge:#BFE6DC;
  --panel-mint:#F3FBF8;
  --mint-soft:#DDF3EC;
  --lilac-soft:#F3E6F8;
  --lilac-line:rgba(155,61,191,.22);
  --butter-soft:#FFF3D1;
  --butter-line:rgba(217,138,28,.26);
  --sky:#5B9FDB;
  --sky-soft:#DDEDFB;
  --sky-line:rgba(91,159,219,.30);
  --peach:#F4A877;
  --peach-deep:#E8915D;
  --peach-soft:#FCDCC6;
  --peach-edge:#F3BE9B;
  --pants:#79B4E6;
  --pants-deep:#5E99CF;
  --skin:#F3C8A6;
  --skin-deep:#E3AE88;
  --flag-red:#D7383F;
  --flag-blue:#26408A;
  --flag-navy:#1E2C66;
  --flag-green:#24915A;
  --flag-white:#FFFFFF;
  --badge-black:#17151B;
  --white-a92:rgba(255,255,255,.92);
  --white-a72:rgba(255,255,255,.72);
  --white-a45:rgba(255,255,255,.45);
  --wash-lilac:rgba(155,61,191,.04);
  --wash-teal:rgba(63,181,160,.04);
  --teal-a12:rgba(47,156,139,.12);
  --dash-teal:rgba(58,174,152,.7);
  --veil:rgba(38,34,45,.20);
  --clear:transparent;
  --shadow-node:0 3px 8px rgba(47,156,139,.10),0 16px 34px rgba(47,156,139,.12);
  --shadow-chip:0 2px 6px rgba(47,156,139,.10),0 10px 22px rgba(47,156,139,.12);
  --shadow-cta:0 12px 24px -10px rgba(110,38,144,.60),0 2px 6px rgba(110,38,144,.18);
  --ds-node:drop-shadow(0 4px 6px rgba(47,156,139,.14)) drop-shadow(0 14px 18px rgba(47,156,139,.12));
  --ds-peach:drop-shadow(0 4px 6px rgba(232,145,93,.18)) drop-shadow(0 14px 18px rgba(47,156,139,.12));
  --hl:inset 0 1px 0 rgba(255,255,255,.95);
  --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","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-panel:24px;
  --r-node:14px;
  --r-icon:9px;
  --r-pill:999px;
  --r-round:50%;
  --r-line:2px;
  --gutter:24px;
  --wrap-width:1200px;
  --reading-width:800px;
  --header-height:72px;
  --anchor-offset:96px;
  --toc-offset:144px;
  --text-size:17px;
  --text-small:14px;
  --text-caption:13px;
  --h1-size:clamp(52px,4.8vw,68px);
  --h2-size:clamp(28px,3vw,34px);
  --h3-size:22px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --section-space:80px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:48px;
  --ease-short:.2s;
  --ease-reveal:.6s;
}
*,*::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;background:linear-gradient(135deg,var(--wash-lilac),var(--wash-teal)),var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-size);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{ -webkit-tap-highlight-color:var(--teal-a12)}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p,h1,h2,h3,h4{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-bold);color:var(--ink);text-wrap:balance}
h1{font-size:var(--h1-size);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--h2-size);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--h3-size);line-height:1.4}
ul,ol{padding-left:1.5em}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:var(--lilac-soft);color:var(--accent-dark)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono);font-weight:var(--weight-semibold);letter-spacing:-.01em}
.muted{color:var(--text-muted)}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{text-align:center;margin-bottom:var(--space-4)}
.section-head p{max-width:640px;margin:var(--space-2) auto 0;color:var(--text-muted)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.grid-three>*,.grid-five>*,.footer-grid>*,.outline-panel>*{min-width:0}
.panel,.card{background:var(--panel);border-radius:var(--r-panel);box-shadow:var(--hl),var(--shadow-node);border:1px solid var(--white-a92);padding:var(--space-4);min-width:0}
.icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ico{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-1);height:52px;padding:0 30px;border-radius:var(--r-pill);font-size:16px;font-weight:var(--weight-bold);letter-spacing:.02em;line-height:1;flex-shrink:0;white-space:nowrap;max-width:100%;transition:transform var(--ease-short),box-shadow var(--ease-short),background-color var(--ease-short)}
.btn-primary{color:var(--panel);background:linear-gradient(180deg,var(--accent-hi) 0%,var(--accent) 60%);box-shadow:var(--hl),var(--shadow-cta)}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);background:var(--accent-dark)}
.btn-ghost,.btn-secondary{color:var(--accent-dark);background:var(--white-a72);box-shadow:inset 0 0 0 2px var(--accent)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);cursor:not-allowed}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn .ico{width:16px;height:16px;stroke-width:2}
.cta-row{margin-top:28px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-top:var(--space-2);margin-bottom:var(--space-3)}
.prose h2{margin-top:var(--space-5);margin-bottom:var(--space-2)}
.prose h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-icon);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border-radius:var(--r-node)}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal}
.decorated{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-width:0;width:100%;max-width:100%;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-3)}
.reveal{transition:opacity var(--ease-reveal) ease,transform var(--ease-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}

/* The top bar shares the approved scene's dimensions. */
.site-header,#site-header{position:relative;z-index:10;min-height:var(--header-height);background:linear-gradient(180deg,var(--white-a72),var(--white-a45));-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--white-a72);box-shadow:0 1px 0 var(--teal-a12)}
.header-in{max-width:1360px;height:var(--header-height);margin:0 auto;padding:0 32px;display:flex;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:36px}
.brand img{width:34px;height:34px}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-bold);font-size:20px;letter-spacing:.02em;color:var(--ink);line-height:1}
.brand-zh{font-weight:var(--weight-medium);font-size:var(--text-small);color:var(--text-muted)}
.main-nav{margin-left:auto}
.main-nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.main-nav a{display:flex;align-items:center;gap:6px;height:36px;padding:0 10px;border-radius:var(--r-pill);font-size:var(--text-small);font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap;transition:background-color var(--ease-short),color var(--ease-short)}
.main-nav a:hover{background:var(--white-a72);color:var(--ink)}
.main-nav a[aria-current="page"]{color:var(--ink);background:var(--white-a92);box-shadow:var(--hl),0 0 0 1px var(--border)}
.header-tools{display:flex;align-items:center;gap:8px;flex:none}
.language-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;background:var(--clear);border-radius:var(--r-pill);font-size:var(--text-small);color:var(--text-muted);white-space:nowrap}
.lang:hover{background:var(--white-a72)}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);width:190px;padding:8px;background:var(--panel);border-radius:var(--r-node);box-shadow:var(--shadow-node);border:1px solid var(--border)}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-icon);font-size:var(--text-small)}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--lilac-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 18px;border-radius:var(--r-pill);background:var(--panel);color:var(--accent-dark);font-size:var(--text-small);font-weight:var(--weight-semibold);box-shadow:inset 0 0 0 1.5px var(--lilac-line),var(--shadow-chip);white-space:nowrap;transition:box-shadow var(--ease-short)}
.login:hover{box-shadow:inset 0 0 0 1.5px var(--accent),var(--shadow-chip)}
.nav-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:var(--panel);border-radius:var(--r-pill);color:var(--ink)}
.mobile-drawer{display:none}
.nav-veil{display:none}
.site-footer,#site-footer{background:linear-gradient(135deg,var(--wash-lilac),var(--wash-teal)),var(--panel-2);position:relative;overflow-x:clip}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:var(--space-4);padding-top:var(--space-5);padding-bottom:var(--space-4)}
.footer-brand p{margin-top:var(--space-2);color:var(--text-muted);font-size:var(--text-small);max-width:320px}
.footer-title{font-size:16px;margin-bottom:var(--space-2)}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-small)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{border-top:1px solid var(--border);padding-top:var(--space-3);padding-bottom:var(--space-3);display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);flex-wrap:wrap;font-size:var(--text-caption);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:var(--space-2)}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}

@media(max-width:1250px) and (min-width:1101px){
  .header-in{padding-inline:20px;gap:10px}
  .main-nav a{padding-inline:7px;gap:4px}
  .lang{padding-inline:8px}
}
@media(max-width:1100px){
  .header-in{padding-inline:20px}
  .main-nav{display:none}
  .header-tools{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;z-index:8;top:100%;left:0;right:0;background:var(--panel);padding:16px 20px;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--border);box-shadow:var(--shadow-node)}
  .mobile-drawer ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}
  .mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-node);font-size:16px}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--lilac-soft);color:var(--accent-dark)}
  .drawer-languages{margin-top:var(--space-2);padding-top:var(--space-2);border-top:1px solid var(--border)}
  .nav-veil:not([hidden]){display:block;position:fixed;z-index:6;inset:var(--header-height) 0 0;background:var(--veil);width:100%;height:calc(100dvh - var(--header-height));border-radius:0}
}
@media(max-width:768px){
  :root{--h1-size:36px;--section-space:56px}
  h1{line-height:1.2}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .btn{height:48px;padding-inline:24px;font-size:15px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.decorative-tilt{transform:none}
  .decorated{max-width:100%}
  .header-in{padding-inline:16px;gap:8px}
  .brand-word{font-size:18px}
  .brand img{width:30px;height:30px}
  .brand{gap:7px}
  .header-tools{margin-left:auto;gap:4px}
  .lang{padding-inline:8px}
  .lang span{display:none}
  .login{padding-inline:12px}
  .login .ico{display:none}
  .panel,.card{padding:var(--space-3)}
  .footer-grid{gap:var(--space-3)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}