:root{
  color-scheme:light;
  --bg:#F8EFE0;--bg-panel:#FFFBF4;--bg-panel-2:#EFE4D1;--paper-2:#F9F2E6;
  --border:#E2D5BF;--border-strong:#CDBEA4;--border-soft:rgba(226,213,191,.75);
  --accent:#5548C8;--accent-dark:#3B2FA0;--accent-glow:#7B70E6;
  --text:#2A2119;--text-muted:#6E6152;--success:#2F8F5B;--warn:#C9731E;--error:#B8392E;
  --apricot:#E0823A;--hero-top:#FCF7EE;--hero-bottom:#F2E7D4;
  --lilac-100:#F2EEFB;--lilac-200:#E6E0F8;--lilac-300:#DCD5F5;--lilac-400:#BDB3EC;
  --on-accent:#FFFFFF;--a-08:rgba(85,72,200,.08);--a-12:rgba(85,72,200,.12);--a-16:rgba(85,72,200,.16);--a-24:rgba(85,72,200,.24);--a-36:rgba(85,72,200,.36);
  --hi:rgba(255,255,255,.9);--hi-soft:rgba(255,255,255,.38);--hi-none:rgba(255,255,255,0);
  --line:rgba(42,33,25,.09);--veil:rgba(42,33,25,.35);--clear:transparent;
  --flag-red:#D33A2F;--flag-white:#FFFFFF;--flag-blue:#2D3A80;--flag-ring:rgba(42,33,25,.16);--mask:#000000;
  --r-sm:6px;--r-md:8px;--r-lg:10px;--r-pill:999px;--r-round:50%;--r-mark:2px;
  --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;
  --fs-micro:10.5px;--fs-tiny:11px;--fs-fine:11.5px;--fs-xs:12px;--fs-sm:13px;--fs-label:14px;--fs-nav:15px;--fs-body:16px;--fs-lede:17px;--fs-price:18px;--fs-brand:20px;--fs-h3:28px;--fs-h2:40px;--fs-h1:clamp(52px,4.6vw,66px);--fs-mobile-h1:40px;
  --weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-display:800;
  --gutter:64px;--wrap:1312px;--header-height:72px;--anchor-offset:88px;--toc-offset:104px;
  --shadow-paper:inset 0 0 0 1px var(--hi),0 24px 64px -24px var(--a-12);
  --ease-out:cubic-bezier(.2,.7,.2,1);--reveal-duration:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html,body{margin:0}
body{font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-normal);color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,select,input,textarea{max-width:100%}
a,button,summary,select{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
ul,ol,dl,dd{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-display);overflow-wrap:anywhere}
h1{font-size:var(--fs-h1);line-height:1.1;letter-spacing:-.02em;margin:0 0 32px}
h2{font-size:var(--fs-h2);line-height:1.2;letter-spacing:-.02em;margin:0 0 24px;text-wrap:balance}
h3{font-size:var(--fs-h3);line-height:1.3;margin:0 0 16px}
p{margin:0 0 24px}
small{font-size:var(--fs-xs)}
strong{font-weight:var(--weight-bold)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;word-break:break-word}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel-2);border-radius:var(--r-md);border:1px solid var(--border)}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.reading-wrap{max-width:880px}
.prose{min-width:0;overflow-wrap:anywhere}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose ul,.prose ol{padding-left:24px;margin-bottom:24px;list-style:revert}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel{min-width:0;padding:28px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-paper)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.icon{width:24px;height:24px;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:50;opacity:.12;mix-blend-mode:multiply}
.reveal{transition:opacity var(--reveal-duration) var(--ease-out),transform var(--reveal-duration) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono);text-align:end}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:12px 28px;border:1.5px solid var(--clear);border-radius:var(--r-md);font-size:var(--fs-body);font-weight:var(--weight-bold);line-height:1.4;white-space:nowrap;flex-shrink:0;text-align:center}
.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi-soft),0 12px 26px -12px var(--a-36)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary svg{width:18px;height:18px;fill:currentColor}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border-strong)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text-muted)}
.btn:active{box-shadow:inset 0 2px 4px var(--a-16)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);box-shadow:none;cursor:not-allowed}
.btn[aria-disabled="true"]{pointer-events:none}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:28px}
.kicker{display:flex;align-items:center;gap:12px;margin:0 0 28px;font-family:var(--font-mono);font-size:var(--fs-sm);font-weight:var(--weight-medium);letter-spacing:.06em;color:var(--text-muted)}
.kicker::before{content:"";flex:none;width:24px;height:3px;border-radius:var(--r-mark);background:var(--apricot)}
.lede{margin:0 0 36px;max-width:31em;font-size:var(--fs-lede);line-height:1.75;color:var(--text-muted)}
.lede strong{color:var(--text);font-weight:var(--weight-bold)}
.site-header{position:relative;z-index:40;background:var(--hero-top);border-bottom:1px solid var(--border-soft)}
.hd{display:flex;align-items:center;gap:48px;height:var(--header-height);position:relative}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand-mark{width:34px;height:34px;display:block;flex:none}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--fs-brand);letter-spacing:-.01em;color:var(--text)}
.brand-zh{font-size:var(--fs-label);font-weight:var(--weight-medium);color:var(--text-muted)}
.nav{flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:28px}
.nav a{display:block;padding:8px 0;font-size:var(--fs-nav);font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.hd-end{display:flex;align-items:center;gap:20px;flex-shrink:0}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:2px;width:auto;min-width:44px;min-height:40px;font-family:var(--font-body);font-size:var(--fs-label);font-weight:var(--weight-medium);color:var(--text);background:none;border:0;border-right:1px solid var(--border);padding:6px 20px 6px 0;cursor:pointer;white-space:nowrap;list-style:none}
.lang::-webkit-details-marker{display:none}
.lang span{color:var(--text-muted);white-space:nowrap}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:90;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-paper)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;font-size:var(--fs-label);border-radius:var(--r-sm);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--lilac-100);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 20px;border:1.5px solid var(--accent);border-radius:var(--r-md);background:var(--bg-panel);color:var(--accent);font-size:var(--fs-label);font-weight:var(--weight-bold);white-space:nowrap}
.btn-login:hover{background:var(--lilac-100)}
.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);border:1px solid var(--border);border-radius:var(--r-md);color:var(--accent-dark)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-mark)}
.mobile-drawer{display:none}
.drawer-languages{padding-top:16px;margin-top:16px;border-top:1px solid var(--border)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-title{font-size:var(--fs-label);font-weight:var(--weight-bold);margin:0 0 16px}
.footer-intro{max-width:29em;margin-top:20px;color:var(--text-muted);font-size:var(--fs-label)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--fs-label)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--fs-sm);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
@media(max-width:1320px){
  .hd{gap:28px}
  .nav ul{gap:20px}
  .hd-end{gap:14px}
}
@media(max-width:1180px){
  .hd{gap:24px}
  .brand-zh{display:none}
  .nav ul{gap:14px}
  .nav a{font-size:var(--fs-label)}
}
@media(max-width:1100px){
  .nav{display:none}
  .hd-end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:fixed;z-index:35;top:var(--header-height);inset-inline:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:20px var(--gutter) 40px;border-top:1px solid var(--border)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);font-size:var(--fs-body)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--lilac-100);color:var(--accent-dark);font-weight:var(--weight-bold)}
  .preview-header .nav{display:block;position:absolute;left:var(--gutter);right:var(--gutter);top:var(--header-height);overflow-x:auto}
  .preview-header .nav ul{width:max-content}
  .preview-header{padding-bottom:44px}
}
@media(max-width:768px){
  :root{--gutter:20px;--fs-h2:30px;--fs-h3:24px;--fs-h1:40px}
  h1{font-size:var(--fs-mobile-h1)}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .hd-end{margin-left:auto}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorated{overflow-x:clip;max-width:100%}
  .decorated>*{max-width:100%}
  .lede{font-size:var(--fs-body)}
  .cta-row .btn{flex:1 1 auto;padding-inline:20px}
  .hd{gap:8px;flex-wrap:nowrap}
  .brand{gap:7px}
  .brand-mark{width:28px;height:28px}
  .brand-en{font-size:var(--fs-price)}
  .hd-end{gap:8px;margin-left:auto}
  .btn-login{padding-inline:12px}
  .lang{font-size:var(--fs-xs);padding-right:8px;border-right:0}
  .panel{padding:22px}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .brand-mark{width:25px;height:25px}
  .brand-en{font-size:var(--fs-body)}
  .brand{gap:5px}
  .hd-end{gap:4px}
  .btn-login{padding-inline:8px}
  .lang{padding-inline:2px}
}
@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}
}