:root {
  --bg:#F8EFDF;
  --bg-panel:#FFFBF4;
  --bg-panel-2:#EFE4D1;
  --border:#E2D5BF;
  --accent:#44659A;
  --accent-dark:#2E4A75;
  --accent-2:#7C97C4;
  --text:#2B2219;
  --text-muted:#6E5F4E;
  --text-faint:#9A8A75;
  --success:#3E7D4F;
  --warn:#B7791F;
  --error:#B4432F;
  --white:#FFFFFF;
  --hero-top:#FBF6EC;
  --hero-bottom:#F1E6D2;
  --panel-soft:#F7F0E4;
  --frame:#2A231C;
  --sand:#E9DCC6;
  --wall-mid:#BCC3CD;
  --hill-far:#98ACCB;
  --hill-mid:#CDC7BC;
  --hill-near:#E2D5C0;
  --tint-blue:#E4EAF4;
  --tint-blue-line:#C9D5E8;
  --tint-success:#E2EDE1;
  --tint-warn:#F6EAD2;
  --tint-warn-line:#ECD6A8;
  --tint-error:#F5E1DA;
  --tint-error-line:#EBC7BC;
  --tint-violet:#E9E4F1;
  --tint-violet-line:#D6CDE6;
  --ink-success:#2F6340;
  --ink-warn:#7E5310;
  --ink-error:#8E3424;
  --ink-violet:#56497F;
  --line-blue:#A9BBDA;
  --line-warn:#E2BC72;
  --line-error:#E0A291;
  --line-violet:#B8ACD6;
  --chrome-red:#DB6E5D;
  --chrome-yellow:#DFAE4C;
  --chrome-green:#72A874;
  --flag-red:#C8463C;
  --flag-blue:#34508C;
  --flag-white:#FFFDF8;
  --flag-green:#3F8A57;
  --accent-rgb:68 101 154;
  --accent-dark-rgb:46 74 117;
  --ink-rgb:43 34 25;
  --frame-rgb:42 35 28;
  --border-rgb:226 213 191;
  --white-rgb:255 255 255;
  --r-xs:5px;
  --r-sm:6px;
  --r-md:8px;
  --r-lg:10px;
  --r-xl:22px;
  --r-pill:999px;
  --r-round:50%;
  --r-flag:3px;
  --r-flag-small:2px;
  --r-wall:14px;
  --r-device-mobile:16px;
  --r-wall-mobile:11px;
  --font-display:Georgia,'Times New Roman','Songti SC','STSong','Noto Serif SC','Source Han Serif SC',serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Malgun Gothic',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --gutter:24px;
  --content-width:1200px;
  --reading-width:800px;
  --header-height:64px;
  --anchor-gap:80px;
  --toc-offset:16px;
  --toc-landing:96px;
  --section-gap:72px;
  --shadow-paper:inset 0 1px 0 rgb(var(--white-rgb) / .9),0 14px 34px -20px rgb(var(--accent-rgb) / .24);
  --paper-grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-gap)}
html,body{margin:0;min-width:0}
body{font-family:var(--font-body);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3{font-family:var(--font-display);font-weight:400;line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);letter-spacing:-.02em}
h2{font-size:36px;margin:0 0 24px}
h3{font-size:24px;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-left:1.5em}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin:24px 0}
.no-break{white-space:nowrap}
.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}
.section{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--text-muted)}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose li{margin-block:8px}
.panel,.card{min-width:0;padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-paper)}
.grid-two,.grid-three,.grid-five{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid-two>*,.grid-three>*,.grid-five>*{min-width:0}
.icon{width:20px;height:20px;display:block;flex-shrink:0}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.paper,.decor-section{position:relative;overflow-x:clip;max-width:100%}
.paper{background:linear-gradient(180deg,var(--hero-top),var(--hero-bottom))}
.paper::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.03;background-image:var(--paper-grain)}
.masthead{position:relative;z-index:30;height:var(--header-height);border-bottom:1px solid rgb(var(--border-rgb) / .8)}
.masthead-row{display:flex;align-items:center;height:100%;gap:32px;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:30px;height:30px;display:block;flex-shrink:0}
.brand-en{font-weight:700;font-size:17px;letter-spacing:.03em;color:var(--text)}
.brand-zh{font-size:14px;font-weight:400;color:var(--text-muted)}
.primary-nav{flex:1;display:flex;justify-content:center;min-width:0}
.primary-nav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:26px}
.primary-nav a{display:inline-flex;align-items:center;min-height:28px;font-size:14.5px;font-weight:450;color:var(--text-muted);padding-block:6px;white-space:nowrap;transition:color .15s ease}
.primary-nav a:hover{color:var(--text)}
.primary-nav a[aria-current="page"]{color:var(--text);font-weight:600}
.masthead-end{display:flex;align-items:center;gap:14px;flex:none}
.language-control{position:relative}
.lang-switch{background:none;border:0;padding:6px 4px;min-height:32px;min-width:44px;width:auto;font-size:14px;color:var(--text-muted);white-space:nowrap}
.language-list{position:absolute;right:0;top:calc(100% + 10px);min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-paper)}
.language-list a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-sm);white-space:nowrap}
.language-list a:hover,.language-list a[aria-current]{background:var(--bg-panel-2)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;height:36px;padding-inline:18px;border-radius:var(--r-md);background:var(--text);color:var(--bg-panel);font-size:14px;font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 rgb(var(--white-rgb) / .12),0 4px 10px -4px rgb(var(--ink-rgb) / .35);transition:background-color .15s ease}
.login-btn:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);font-size:20px}
.mobile-drawer{display:none;position:absolute;top:var(--header-height);left:var(--gutter);right:var(--gutter);background:var(--bg-panel);padding:12px;border:1px solid var(--border);border-radius:var(--r-md);max-height:calc(100dvh - var(--header-height) - 16px);overflow-y:auto;overscroll-behavior:contain;z-index:32;box-shadow:var(--shadow-paper)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
.drawer-languages{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;background:rgb(var(--ink-rgb) / .24);border:0;width:100%;z-index:31;cursor:pointer}
html.nav-open{overflow:hidden}
.lead-screen{position:relative;z-index:1;padding-top:32px;padding-bottom:72px}
.lead-copy{text-align:center}
.kicker{display:inline-flex;align-items:center;gap:8px;height:28px;margin:0;padding:0 13px 0 11px;border-radius:var(--r-pill);background:var(--bg-panel);border:1px solid var(--border);font-size:13px;color:var(--text-muted);box-shadow:inset 0 1px 0 rgb(var(--white-rgb) / .9),0 2px 6px -3px rgb(var(--accent-rgb) / .25)}
.kicker-dot{width:7px;height:7px;flex-shrink:0;border-radius:var(--r-round);background:var(--accent);box-shadow:0 0 0 3px var(--tint-blue)}
.lead-title{margin:18px 0 22px;font-family:var(--font-display);font-weight:400;font-size:64px;line-height:1.12;letter-spacing:-.02em;color:var(--text)}
.cta-pair{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 24px;border:0;border-radius:var(--r-md);font-size:16px;font-weight:600;line-height:1.5;flex-shrink:0;white-space:nowrap;transition:transform .15s ease,box-shadow .15s ease}
.btn svg{width:16px;height:16px;display:block}
.btn-go,.btn-primary{color:var(--white);background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:inset 0 1px 0 rgb(var(--white-rgb) / .28),0 12px 26px -10px rgb(var(--accent-rgb) / .6)}
.btn-go:hover,.btn-primary:hover,.btn-demo-hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 rgb(var(--white-rgb) / .28),0 16px 30px -10px rgb(var(--accent-rgb) / .65)}
.btn-plain,.btn-secondary{color:var(--text);background:var(--bg-panel);border:1px solid var(--border);box-shadow:inset 0 1px 0 rgb(var(--white-rgb)),0 2px 6px -3px rgb(var(--ink-rgb) / .12)}
.btn-plain:hover,.btn-secondary:hover{transform:translateY(-1px)}
.btn:active,.btn-demo-active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;pointer-events:none;box-shadow:none}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.lead-sub{max-width:760px;margin:22px auto 12px;font-size:18px;line-height:1.6;color:var(--text-muted)}
.lead-sub strong{color:var(--text);font-weight:600}
.assure{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 20px;margin:0 0 22px;padding:0;list-style:none;font-size:14px;line-height:22px;color:var(--text-muted)}
.assure li{display:inline-flex;align-items:center;gap:6px}
.assure svg{width:14px;height:14px;display:block;color:var(--success)}
.marks{display:grid;justify-items:center;gap:10px;margin-bottom:40px}
.mark-row{display:flex;align-items:center;gap:16px;min-height:24px}
.mark-label{min-width:56px;padding-right:16px;border-right:1px solid var(--border);font-size:12px;letter-spacing:.06em;color:var(--text-faint);text-align:right}
.mark-row ul{display:flex;align-items:center;gap:24px;margin:0;padding:0;list-style:none}
.mark-row li{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:var(--text-muted);white-space:nowrap}
.plat-ico{width:18px;height:18px;display:block;flex:none;opacity:.78}
.flag{position:relative;display:inline-block;flex:none;overflow:hidden;border-radius:var(--r-flag);filter:saturate(.86)}
.flag::after{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 1px rgb(var(--ink-rgb) / .14)}
.flag svg{display:block;width:100%;height:100%}
.flag-l{width:21px;height:14px}
.flag-m{width:18px;height:12px;border-radius:var(--r-flag-small)}
.flag-s{width:15px;height:10px;border-radius:var(--r-flag-small)}
.f-red{fill:var(--flag-red)}
.f-blue{fill:var(--flag-blue)}
.f-white{fill:var(--flag-white)}
.f-green{fill:var(--flag-green)}
.site-footer{border-top:1px solid var(--border);background:var(--bg-panel-2);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{font-size:14px;color:var(--text-muted);margin-top:16px;max-width:320px}
.footer-title{font-family:var(--font-body);font-size:14px;font-weight:600;margin:0 0 12px}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 18px;margin:0;padding:0;list-style:none}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:13px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:48px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(max-width:1180px){
  .masthead-row{gap:20px}
  .primary-nav ul{gap:18px}
  .masthead-end{gap:10px}
}
@media(max-width:960px){
  .primary-nav{display:none}
  .masthead-end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,5vw,40px)}
  h2{font-size:30px}
  .lead-title{font-size:40px}
  .lead-sub{font-size:17px}
  .mark-row{flex-direction:column;gap:8px}
  .mark-label{min-width:0;padding-right:0;border-right:0;text-align:center}
  .mark-row ul{flex-wrap:wrap;justify-content:center;gap:10px 18px}
  .grid-three{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px;--section-gap:48px}
  .no-break{white-space:normal}
  .tilt{transform:none!important}
  .decor-section,.paper{max-width:100%;overflow-x:clip}
  .grid-two{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-brand{grid-column:auto}
}
@media(max-width:560px){
  .masthead-row{gap:12px}
  .masthead-end{gap:6px}
  .lead-title{font-size:34px}
  .btn{min-height:46px;padding:10px 20px}
}
@media(max-width:420px){
  .masthead-end>.language-control{display:none}
  .brand-zh{font-size:13px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}