:root{
  color-scheme:light;
  --bg:#F7F6F3;
  --bg-tint:#EEF3EE;
  --bg-panel:#FFFFFF;
  --bg-panel2:#ECEEE9;
  --phone-tint:#F5F9F7;
  --border:#DCE0DA;
  --accent:#12A383;
  --accent-dark:#0B6E5A;
  --coral:#F2668B;
  --violet:#8B5CF6;
  --text:#14231F;
  --text-muted:#5A6762;
  --success:#1F9D57;
  --warn:#D98A12;
  --error:#D9344F;
  --clear:transparent;
  --accent-wash:rgba(18,163,131,.06);
  --accent-soft:rgba(18,163,131,.11);
  --accent-ring:rgba(18,163,131,.28);
  --coral-soft:rgba(242,102,139,.13);
  --violet-soft:rgba(139,92,246,.13);
  --glow-emerald:rgba(18,163,131,.07);
  --glow-violet:rgba(139,92,246,.06);
  --shadow-tint:rgba(18,163,131,.12);
  --shadow-tint-strong:rgba(11,110,90,.18);
  --shadow-ink:rgba(20,35,31,.07);
  --edge:rgba(20,35,31,.07);
  --hi:rgba(255,255,255,.95);
  --hi-fade:rgba(255,255,255,0);
  --orb-hi:rgba(255,255,255,.42);
  --badge-glow-emerald:rgba(18,163,131,.38);
  --badge-glow-coral:rgba(242,102,139,.38);
  --badge-glow-violet:rgba(139,92,246,.38);
  --notice-from:#FDE4EB;
  --notice-to:#EAE3FD;
  --notice-edge:rgba(242,102,139,.22);
  --mark-line:rgba(11,110,90,.38);
  --mask-solid:#000000;
  --flag-red:#D52B3A;
  --flag-white:#FFFFFF;
  --flag-blue:#22397A;
  --flag-fr-blue:#1F4AA8;
  --flag-black:#1C1C1C;
  --flag-gold:#F3C432;
  --r-xl:24px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --r-xs:3px;
  --r-flag:2px;
  --r-phone:30px;
  --r-section:32px;
  --r-chrome:23px;
  --r-pill:999px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:24px;
  --page-width:1288px;
  --header-height:72px;
  --anchor-gap:88px;
  --toc-offset:16px;
  --toc-landing:104px;
  --panel-shadow:inset 0 1px 0 var(--hi),0 28px 60px -18px var(--shadow-tint),0 10px 24px -14px var(--shadow-ink);
  --ease-ui:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;font:400 17px/1.75 var(--font-body);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{margin:0 0 32px;font-size:clamp(52px,4.6vw,66px);line-height:1.1;font-weight:900;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:clamp(28px,3vw,40px);line-height:1.2;font-weight:800;letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:24px;line-height:1.35;font-weight:800;letter-spacing:-.01em}
ul,ol{padding-left:24px}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel2);border-radius:var(--r-md);font-family:var(--font-mono)}
pre code{overflow-wrap:normal;white-space:pre}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:3px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.wrap{width:100%;max-width:var(--page-width);margin:0 auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:720px;margin-bottom:40px}
.section-head p,.muted{color:var(--text-muted)}
.stack-space>*+*{margin-top:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.grid-5{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
:where(.grid-3,.grid-4,.grid-5,.hero-grid,.footer-grid)>*{min-width:0}
.panel{padding:32px;background:var(--bg-panel);border:1px solid var(--edge);border-radius:var(--r-xl);box-shadow:var(--panel-shadow);min-width:0}
.eyebrow{font-size:13px;line-height:20px;font-weight:700;letter-spacing:.12em;color:var(--accent-dark)}
.grad{background:linear-gradient(100deg,var(--accent) 0%,var(--violet) 100%);-webkit-background-clip:text;background-clip:text;color:var(--clear);-webkit-text-fill-color:var(--clear)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:14px 28px;border:1px solid var(--clear);border-radius:var(--r-md);font:700 17px/1.5 var(--font-body);text-decoration:none;transition:background-color .2s,border-color .2s,color .2s;flex-shrink:0;white-space:nowrap}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--accent);color:var(--bg-panel);box-shadow:0 14px 28px -12px var(--badge-glow-emerald),inset 0 1px 0 var(--orb-hi)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary:active{background:var(--accent-dark);box-shadow:inset 0 2px 4px var(--shadow-tint-strong)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);color:var(--text);border-color:var(--border);box-shadow:0 10px 24px -16px var(--shadow-tint)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn-ghost:active,.btn-secondary:active{background:var(--accent-wash)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel2);color:var(--text-muted);border-color:var(--border);box-shadow:none}
.btn-small{min-height:44px;padding:10px 18px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:32px}
.topbar{position:relative;z-index:50;border-bottom:1px solid var(--edge)}
.topbar-inner{display:flex;align-items:center;height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand-mark{width:28px;height:28px;display:block}
.brand-word{font:900 21px/1 var(--font-display);letter-spacing:-.03em;color:var(--text)}
.brand-zh{font-size:16px;font-weight:500;color:var(--text-muted)}
.mainnav{margin-left:48px}
.mainnav ul{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0}
.mainnav a{display:block;font-size:15px;line-height:24px;font-weight:500;color:var(--text-muted);text-decoration:none;transition:color .2s;padding-block:10px}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:700}
.tools{margin-left:auto;display:flex;align-items:center;gap:16px;flex:none}
.language-picker{position:relative}
.lang{appearance:none;border:0;background:var(--clear);font:500 14.5px/1 var(--font-body);color:var(--text-muted);padding:8px 4px;min-width:44px;min-height:32px;width:auto;white-space:nowrap;cursor:pointer}
.lang:hover{color:var(--text)}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);width:192px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--panel-shadow);z-index:60}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm);font-size:14px}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 20px;border-radius:var(--r-pill);border:1.5px solid var(--text);background:var(--bg-panel);font:700 14.5px/1 var(--font-body);color:var(--text);text-decoration:none;transition:background-color .2s,color .2s}
.login:hover{background:var(--text);color:var(--bg-panel)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel);font-size:22px}
.mobile-drawer{position:absolute;top:var(--header-height);inset-inline:0;z-index:52;background:var(--bg-panel);border-bottom:1px solid var(--border);padding:16px var(--gutter) 24px;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;box-shadow:0 24px 40px -24px var(--shadow-tint-strong)}
.mobile-drawer ul{list-style:none;padding:0;margin:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-soft);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;z-index:40;border:0;background:var(--shadow-tint-strong);width:100%;height:calc(100dvh - var(--header-height))}
.site-footer{padding-top:64px;padding-bottom:32px;border-top:1px solid var(--border);background:linear-gradient(180deg,var(--bg-tint),var(--bg))}
.footer-grid{display:grid;grid-template-columns:1.3fr 1.5fr 1fr 1fr;gap:40px}
.footer-intro{margin-top:20px;color:var(--text-muted);font-size:14px;max-width:320px}
.footer-heading{margin:0 0 16px;font-size:15px;font-weight:800}
.footer-links{list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px;font-size:14px;color:var(--text-muted);text-decoration:none}
.footer-links a:hover{color:var(--accent-dark)}
.footer-nav{columns:2;column-gap:24px}
.footer-nav li{break-inside:avoid}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:12px 24px}
.legal-links a{display:inline-flex;align-items:center;min-height:24px}
.prose{max-width:840px;min-width:0}
.prose p{margin-bottom:24px;overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li{margin-block:8px}
.reveal{transition:opacity .6s var(--ease-ui),transform .6s var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:32px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.fr{fill:var(--flag-red)}
.fw{fill:var(--flag-white)}
.fb{fill:var(--flag-blue)}
.ffb{fill:var(--flag-fr-blue)}
.fk{fill:var(--flag-black)}
.fg{fill:var(--flag-gold)}
.st-a{stop-color:var(--accent)}
.st-b{stop-color:var(--violet)}
@media(max-width:1200px){
  .mainnav{margin-left:32px}
  .mainnav ul{gap:18px}
}
@media(max-width:960px){
  .mainnav{display:none}
  .menu-toggle{display:inline-flex}
  .tools{margin-left:auto}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-4,.grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:961px){
  .mobile-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:38px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-3{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .stage,.decorated-section{max-width:100%;overflow-x:clip}
  .tools{gap:8px;margin-left:auto}
  .login{padding-inline:16px}
  .panel{padding:24px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .grid-4,.grid-5{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .tools{gap:4px}
  .brand{gap:6px}
  .brand-word{font-size:19px}
  .brand-mark{width:24px;height:24px}
  .login{padding-inline:12px}
  .lang{font-size:13px}
  .btn{padding-inline:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}