:root {
  --bg:#FAFAFC;
  --panel:#FFFFFF;
  --panel-soft:#FCFCFE;
  --panel-2:#F2F2F7;
  --border:#E4E4EE;
  --edge:rgba(35,37,47,.06);
  --accent:#7B5AF6;
  --accent-hi:#9479FA;
  --accent-dark:#5638D4;
  --accent-2:#2FA4E7;
  --accent-line:rgba(123,90,246,.38);
  --text:#23252F;
  --muted:#646878;
  --faint:#9497A8;
  --on-accent:#FFFFFF;
  --success:#1F9D6B;
  --success-tint:#EAF6F0;
  --success-line:#C3E6D5;
  --warn:#C98410;
  --error:#D6455A;
  --toggle-mid:#8C90A1;
  --toggle-off:#E9E9F1;
  --grid-line:rgba(35,37,47,.03);
  --wash-a:rgba(123,90,246,.06);
  --wash-b:rgba(47,164,231,.05);
  --tint-06:rgba(123,90,246,.06);
  --tint-10:rgba(123,90,246,.10);
  --tint-14:rgba(123,90,246,.14);
  --tint-24:rgba(123,90,246,.24);
  --sky-06:rgba(47,164,231,.06);
  --sky-10:rgba(47,164,231,.10);
  --stripe-a:rgba(123,90,246,.22);
  --stripe-b:rgba(47,164,231,.20);
  --ink-04:rgba(35,37,47,.04);
  --ink-08:rgba(35,37,47,.08);
  --ink-20:rgba(35,37,47,.20);
  --hi:rgba(255,255,255,.95);
  --hi-25:rgba(255,255,255,.25);
  --hi-10:rgba(255,255,255,.10);
  --mask:#000000;
  --mask-soft:rgba(0,0,0,.15);
  --flag-red:#D52B3A;
  --flag-navy:#2B3A82;
  --flag-blue:#24489A;
  --flag-green:#16894B;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(35,37,47,.12);
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:6px;
  --r-sm:10px;
  --r-mark:7px;
  --r-card:20px;
  --r-panel:24px;
  --r-chip:22px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:40px;
  --wrap-width:1360px;
  --head-height:76px;
  --anchor-offset:92px;
  --toc-offset:88px;
  --toc-anchor:160px;
  --body-size:17px;
  --body-leading:1.7;
  --display-size:clamp(52px,4.9vw,70px);
  --display-weight:900;
  --shadow-panel:inset 0 1px 0 var(--hi),0 16px 44px var(--tint-10);
  --shadow-button:inset 0 1px 0 var(--hi-25),0 12px 36px var(--tint-14),0 4px 10px var(--tint-14);
  --gradient:linear-gradient(135deg,var(--accent),var(--accent-2));
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,var(--clear) 1px),linear-gradient(90deg,var(--grid-line) 1px,var(--clear) 1px);background-size:40px 40px;background-position:-1px -1px;color:var(--text);font-family:var(--font-body);font-size:var(--body-size);line-height:var(--body-leading);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,select,input,textarea{color:var(--text)}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{font-size:var(--display-size);font-weight:var(--display-weight);line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3.4vw,44px);font-weight:900;line-height:1.2;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:22px;line-height:1.4;margin:0 0 12px}
p{margin:0 0 20px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel-2);font-family:var(--font-mono)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin-inline:0}
.wrap{width:100%;max-width:var(--wrap-width);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:72px;padding-bottom:72px}
.reading-wrap{max-width:880px;margin-inline:auto}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn-primary):not(.btn-secondary){color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose li{margin-bottom:8px}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
:where(.grid-two,.grid-three,.hero-grid,.footer-grid)>*{min-width:0}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{padding:32px;background:var(--panel);border:1px solid var(--edge);border-radius:var(--r-panel);box-shadow:var(--shadow-panel);min-width:0}
.card{border-radius:var(--r-card)}
.btn-primary,.btn-secondary,.login{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;min-height:44px}
.btn-primary{height:52px;padding:0 30px;border:0;border-radius:var(--r-pill);background:linear-gradient(180deg,var(--accent-hi),var(--accent));color:var(--on-accent);font-size:16px;font-weight:700;letter-spacing:.01em;box-shadow:var(--shadow-button);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);background:linear-gradient(180deg,var(--accent),var(--accent-dark));box-shadow:inset 0 1px 0 var(--hi-25),0 16px 40px var(--tint-24),0 4px 10px var(--tint-14)}
.btn-primary:active{transform:translateY(1px)}
.btn-primary:disabled,.btn-secondary:disabled{cursor:not-allowed;background:var(--panel-2);color:var(--muted);box-shadow:none}
.btn-secondary{padding:10px 24px;border:1px solid var(--accent-line);border-radius:var(--r-pill);background:var(--panel);color:var(--accent-dark);font-size:16px;font-weight:600}
.btn-secondary:hover{border-color:var(--accent);background:var(--tint-06)}
.btn-link{display:inline-flex;align-items:center;gap:8px;min-height:24px;font-size:16px;font-weight:600;color:var(--text);transition:color .2s var(--ease)}
.btn-link-arrow{color:var(--accent);transition:transform .2s var(--ease)}
.btn-link:hover{color:var(--accent-dark)}
.btn-link:hover .btn-link-arrow{transform:translateX(3px)}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 28px;margin-top:32px}
.top{position:relative;overflow-x:clip;max-width:100%}
.top::before{content:"";position:absolute;inset:0;background:linear-gradient(112deg,var(--wash-a),var(--wash-b));mask-image:linear-gradient(180deg,var(--mask) 0%,var(--mask) 26%,var(--clear) 96%);pointer-events:none}
.site-head{position:relative;z-index:60}
.site-head .wrap{display:flex;align-items:center;gap:24px;height:var(--head-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;font-family:var(--font-display);font-weight:800;font-size:21px;letter-spacing:-.02em;color:var(--text);min-height:44px}
.brand img{width:34px;height:34px;flex:none;filter:drop-shadow(0 6px 12px var(--tint-24))}
.brand-zh{font-size:16px;font-weight:500;color:var(--muted)}
.nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-list a{display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 12px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;color:var(--muted);white-space:nowrap;transition:color .2s var(--ease),background-color .2s var(--ease)}
.nav-list a svg{width:16px;height:16px;color:var(--faint)}
.nav-list a:hover{color:var(--text);background:var(--tint-06)}
.nav-list a:hover svg{color:var(--accent)}
.nav-list a[aria-current="page"]{color:var(--text);background:var(--panel);box-shadow:0 0 0 1px var(--border),0 4px 14px var(--tint-06)}
.nav-list a[aria-current="page"] svg{color:var(--accent)}
.head-end{display:flex;align-items:center;gap:8px;flex:none;padding-left:16px;border-left:1px solid var(--border)}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:36px;padding:0 10px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:14px;color:var(--muted);white-space:nowrap}
.lang svg{width:16px;height:16px;color:var(--faint)}
.lang-caret{font-size:11px;color:var(--faint)}
.lang-menu{position:absolute;right:0;top:calc(100% + 12px);width:188px;padding:8px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-panel)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--tint-06);color:var(--accent-dark)}
.login{height:38px;min-height:38px;padding:0 20px;border:1px solid var(--accent-line);border-radius:var(--r-pill);background:var(--panel);color:var(--accent-dark);font-size:14.5px;font-weight:600;transition:box-shadow .2s var(--ease)}
.login:hover{border-color:var(--accent);box-shadow:0 6px 18px var(--tint-14)}
.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(--panel)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:55;border:0;background:var(--ink-20)}
html.nav-open{overflow:hidden}
.hero{position:relative;z-index:1;padding-top:56px;padding-bottom:72px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 46%;gap:48px;align-items:center}
.hero-copy{position:relative;z-index:2;min-width:0}
.announce{display:inline-flex;align-items:center;gap:10px;font-size:14.5px;font-weight:600;line-height:32px;color:var(--muted)}
.announce-mark{display:inline-grid;place-items:center;flex:none;width:24px;height:24px;border-radius:var(--r-mark);background:var(--gradient);color:var(--on-accent);box-shadow:0 4px 10px var(--tint-24)}
.announce-arrow{color:var(--accent);transition:transform .2s var(--ease)}
.announce:hover{color:var(--text)}
.announce:hover .announce-arrow{transform:translateX(3px)}
.h1{margin:24px 0 0;font-family:var(--font-display);font-weight:900;font-size:clamp(44px,4.9vw,70px);line-height:1.06;letter-spacing:-.03em}
.h1-ink{display:block;color:var(--text)}
.h1-grad{display:inline-block;padding-bottom:.04em;background:linear-gradient(90deg,var(--accent),var(--accent-2));background-clip:text;-webkit-background-clip:text;color:var(--clear);-webkit-text-fill-color:var(--clear)}
.lede{max-width:600px;margin:28px 0 0;font-size:18px;line-height:1.7;color:var(--muted)}
.lede strong{font-weight:600;color:var(--text)}
.trust{display:flex;flex-wrap:wrap;align-items:center;gap:6px 0;margin:20px 0 0;padding:0;list-style:none;font-size:14.5px;line-height:1.7;color:var(--muted)}
.trust li{display:inline-flex;align-items:center}
.trust li+li::before{content:"";display:inline-block;flex:none;width:4px;height:4px;margin:0 12px;border-radius:var(--r-circle);background:var(--faint)}
.spec{display:grid;gap:14px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.spec-row{display:grid;grid-template-columns:72px minmax(0,1fr);align-items:center;gap:12px}
.spec-label{font-size:12.5px;font-weight:600;letter-spacing:.08em;color:var(--faint)}
.spec-items{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;margin:0;padding:0;list-style:none}
.plat{display:inline-flex;align-items:center;gap:7px;font-size:14px;font-weight:500;line-height:30px;color:var(--muted)}
.plat svg{width:18px;height:18px;color:var(--text)}
.spec-items--flags{gap:8px}
.flag-chip{display:inline-flex;align-items:center;gap:7px;min-height:30px;padding:0 12px 0 7px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);font-size:13.5px;font-weight:500;color:var(--text);box-shadow:0 2px 6px var(--ink-04)}
.flag-chip svg{width:24px;height:16px;flex:none}
.fl-r{fill:var(--flag-red)}
.fl-w{fill:var(--flag-white)}
.fl-n{fill:var(--flag-navy)}
.fl-b{fill:var(--flag-blue)}
.fl-g{fill:var(--flag-green)}
.fl-edge{fill:var(--clear);stroke:var(--flag-edge);stroke-width:1}
.band{position:relative;z-index:1;padding-bottom:64px}
.band-panel{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--edge);border-radius:var(--r-card);background:var(--panel);box-shadow:inset 0 1px 0 var(--hi),0 12px 36px var(--tint-06)}
.band-cell{display:flex;align-items:baseline;gap:12px;padding:22px 28px;min-width:0}
.band-cell+.band-cell{border-left:1px solid var(--border)}
.band-num{font-family:var(--font-mono);font-size:22px;font-weight:600;letter-spacing:-.02em;color:var(--text)}
.band-num em{font-style:normal;color:var(--accent)}
.band-label{font-size:14px;color:var(--muted)}
.site-foot{margin-top:48px;border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.footer-title{font-size:14px;font-weight:700;margin:0 0 16px}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--accent-dark)}
.footer-brand p{margin-top:20px;font-size:14px;color:var(--muted);max-width:300px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:16px}
.legal-links a{display:inline-flex;align-items:center;min-height:24px}
.reveal{transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:160px;min-width:0;width:100%;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(max-width:1240px){.nav-list a{padding:0 9px}}
@media(max-width:1180px){
  .nav-list a{padding:0 10px}
  .nav-label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);clip-path:inset(50%);white-space:nowrap}
}
@media(max-width:1100px){
  .hero-grid{grid-template-columns:minmax(0,1fr);gap:56px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  .nav{display:none}
  .head-end{margin-left:auto;padding-left:0;border-left:0}
  .site-head .wrap{gap:12px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;top:var(--head-height);left:0;right:0;z-index:61;padding:16px var(--gutter) 24px;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:0 20px 44px var(--tint-14);max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain}
  .mobile-drawer a{display:flex;width:100%;align-items:center;gap:12px;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);font-size:15px}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--tint-06);color:var(--accent-dark)}
  .mobile-drawer svg{width:18px;height:18px}
  .drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
  .hero{padding-top:32px;padding-bottom:48px}
  h1,.h1{font-size:clamp(28px,9vw,40px)}
  .lede{font-size:17px}
  .grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
  .band-panel{grid-template-columns:repeat(2,minmax(0,1fr))}
  .band-cell:nth-child(3){border-left:0}
  .band-cell:nth-child(n+3){border-top:1px solid var(--border)}
  .section{padding-top:48px;padding-bottom:48px}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .wrap{width:100%;padding-inline:var(--gutter)}
  .spec-row{grid-template-columns:minmax(0,1fr);gap:8px}
  .band-cell{flex-direction:column;gap:2px;padding:16px 18px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .panel,.card{padding:24px}
  .tilt,.import-panel{transform:none}
  .top,.decor-section,.stripe-halo{max-width:100%;overflow-x:clip}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .head-end{gap:4px}
  .login{padding-inline:12px}
  .lang{padding-inline:6px}
  .brand{font-size:19px;gap:7px}
  .brand img{width:30px;height:30px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}