:root{
  --bg:#FFFFFF;--panel:#F6F8F7;--panel-2:#ECF1EE;--border:#E1E7E3;
  --accent:#34DFA0;--accent-dark:#0A7A53;--mint-soft:#CDF7E5;--mint-mid:#8FEFC8;
  --green-deep:#13573E;--ink-deep:#0F1F19;--text:#0D1512;--muted:#5A6560;
  --on-mint:#24503F;--on-deep:#B9CCC3;--success:#139A57;--warn:#C98A0B;--error:#D6453D;--white:#FFFFFF;
  --flag-red:#D33A3A;--flag-blue:#284C9A;--flag-gold:#E8B530;--flag-black:#141A17;
  --atmo:rgb(52 223 160 / .06);--mint-a12:rgb(52 223 160 / .12);--mint-a35:rgb(52 223 160 / .35);--mint-a55:rgb(52 223 160 / .55);
  --ink-a08:rgb(13 21 18 / .08);--ink-a14:rgb(13 21 18 / .14);--ink-a35:rgb(13 21 18 / .35);--deep-a40:rgb(15 31 25 / .4);
  --white-a12:rgb(255 255 255 / .12);--white-a45:rgb(255 255 255 / .45);--white-a70:rgb(255 255 255 / .7);
  --clear:transparent;
  --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",-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-xl:16px;--r-pill:999px;--r-round:50%;--r-corner:4px;
  --shadow-card:0 24px 56px -14px var(--mint-a12),0 16px 34px -20px var(--deep-a40),0 1px 2px var(--ink-a08);
  --shadow-window:0 44px 96px -22px var(--mint-a12),0 30px 60px -30px var(--deep-a40),0 2px 6px var(--ink-a08);
  --shadow-deal:0 26px 50px -18px var(--deep-a40),0 0 0 1px var(--white-a12) inset;
  --gutter:48px;--content-width:1440px;--header-height:72px;--anchor-offset:152px;
  --ease: .2s ease;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:88px;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}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
a,button,summary{touch-action:manipulation}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
p,ul,ol,blockquote,figure{margin:0}
ul{padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);margin:0;line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);font-weight:900;letter-spacing:-.02em;line-height:1.1}
h2{font-size:clamp(28px,3vw,44px);font-weight:900;letter-spacing:-.02em}
h3{font-size:22px;font-weight:800}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-sm);background:var(--ink-deep);color:var(--on-deep)}
pre code{overflow-wrap:normal}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:88px;padding-bottom:88px}
.stack{display:grid;gap:24px}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two>*,.grid-three>*,.hero-grid>*,.footer-grid>*{min-width:0}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.skip{position:absolute;left:16px;top:-60px;z-index:100;padding:10px 16px;border-radius:var(--r-sm);background:var(--text);color:var(--white);font-weight:700}
.skip:focus{top:12px}
.top{position:relative;overflow-x:clip;background:linear-gradient(180deg,var(--atmo) 0%,var(--atmo) 18%,var(--clear) 640px)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:12px 30px;border:1px solid var(--clear);border-radius:var(--r-pill);font-size:16px;font-weight:700;letter-spacing:.01em;line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease)}
.btn svg{width:18px;height:18px;transition:transform var(--ease)}
.btn-primary{background:var(--accent);color:var(--text);box-shadow:inset 0 1px 0 var(--white-a45),0 14px 28px -14px var(--mint-a55)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:hover svg{transform:translateX(3px)}
.btn-ghost,.btn-secondary{border:1px solid var(--muted);background:var(--white);color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text);background:var(--panel)}
.btn-small{min-height:44px;padding:10px 20px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:inset 0 1px 0 var(--white)}
.card{background:var(--white);box-shadow:var(--shadow-card)}
.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}
#server-status{position:relative;display:block;min-width:0;min-height:160px;max-width:100%;overflow:hidden;margin-top:32px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.site-head,#site-header{position:relative;z-index:60}
.head-row{display:flex;align-items:center;height:var(--header-height);gap:32px;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:-.02em;color:var(--text);flex-shrink:0}
.brand-mark{width:30px;height:30px;flex-shrink:0}
.brand-zh{font-weight:500;color:var(--muted)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-list a{display:block;padding:8px 14px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;color:var(--muted);white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.nav-list a:hover{color:var(--text);background:var(--panel)}
.nav-list a[aria-current="page"]{background:var(--mint-soft);color:var(--text);font-weight:700}
.nav-list>li:nth-child(n+6):not(.nav-more){display:none}
.nav-more{display:block;position:relative;flex-shrink:0}
.nav-more-toggle{cursor:pointer;padding:8px 10px;border:0;background:var(--clear);border-radius:var(--r-pill);font-size:14.5px;color:var(--muted);white-space:nowrap}
.nav-more-toggle[aria-expanded="true"]{background:var(--mint-soft);color:var(--text)}
.nav-more ul{position:absolute;top:100%;right:0;z-index:90;min-width:220px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--white);box-shadow:var(--shadow-card)}
.nav-more ul a{min-height:44px}
.head-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:40px;width:auto;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:14px;color:var(--muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel);color:var(--text)}
.lang svg{width:16px;height:16px}
.lang-panel{position:absolute;top:calc(100% + 10px);right:0;z-index:90;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--white);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--mint-soft)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 24px;border-radius:var(--r-pill);background:var(--accent);color:var(--text);font-size:14.5px;font-weight:700;white-space:nowrap;box-shadow:inset 0 1px 0 var(--white-a45);transition:transform var(--ease),box-shadow var(--ease)}
.btn-login:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--white-a45),0 10px 22px -12px var(--mint-a55)}
.menu-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--white)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"]{background:var(--mint-soft)}
.nav-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:70;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--white);padding:16px var(--gutter) 40px}
.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="page"],.nav-drawer a[aria-current="true"]{background:var(--mint-soft)}
.drawer-languages{display:grid;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;top:var(--header-height);inset-inline:0;bottom:0;z-index:65;background:var(--deep-a40);border:0}
html.nav-open{overflow:hidden}
.site-footer{background:var(--ink-deep);color:var(--on-deep);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px}
.site-footer .brand{color:var(--white)}
.footer-copy{margin-top:20px;max-width:30em}
.footer-heading{font-size:15px;color:var(--white);font-weight:700;margin-bottom:16px}
.footer-links{display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-links a:hover{color:var(--accent)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin-top:48px;padding-top:24px;border-top:1px solid var(--white-a12);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.site-footer :focus-visible{outline-color:var(--accent)}
.prose{max-width:78ch}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-top:20px}
.prose ul{padding-left:24px;list-style:disc}
.prose ol{padding-left:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
@media(max-width:1399px){
  .head-row{gap:20px}
  .nav-list a{padding-inline:8px}
}
@media(max-width:1180px){
  .nav{display:none}.head-tools{margin-left:auto}.menu-toggle{display:flex}
}
@media(min-width:1181px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  :root{--gutter:24px}
  h1{font-size:clamp(28px,7vw,40px)}
  h2{font-size:30px}
  .sec{padding-top:56px;padding-bottom:56px}
  .grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:64px}
  .no-break{white-space:normal}
  .head-row{gap:8px}
  .brand{gap:6px;font-size:16px}
  .brand-mark{width:26px;height:26px}
  .head-tools{gap:4px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px}
  .lang svg{display:none}
  .btn-login{padding-inline:14px;font-size:13px}
  .panel,.card{padding:20px}
  .tilt,.tilt-decor{transform:none}
  [data-parallax-decor]{max-width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .btn{padding-inline:24px}
}
@media(max-width:359px){
  .brand{font-size:14px;gap:4px}.brand-mark{width:22px;height:22px}
  .lang{font-size:11px;padding-inline:3px}.btn-login{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  .btn,.btn svg,.btn-login,.nav-list a{transition:none}
}