:root{
  --c-bg:#F8F2E6;--c-bg-deep:#F2E9D8;--c-panel:#FFFBF4;--c-kraft:#EFE5D2;--c-line:#E2D6BF;
  --c-ink:#0B68B0;--c-ink-deep:#084D84;--c-wash:#E9EFF4;
  --c-text:#2A2118;--c-text-soft:#3D3125;--c-muted:#6E6152;
  --c-ok:#2F7D4F;--c-warn:#B7791F;--c-err:#B83A2E;--c-white:#FFFFFF;
  --metal-hi:#FCF9F3;--metal-mid:#E7DFD1;--metal-lo:#CDC1AE;--metal-edge:#A99A83;
  --f-red:#C8102E;--f-blue:#2B3A6B;--f-navy:#13296A;--f-sun:#BC002D;--f-white:#FFFFFF;
  --halo-apricot:rgba(232,158,92,.08);--halo-apricot-0:rgba(232,158,92,0);
  --halo-ink:rgba(11,104,176,.07);--halo-ink-0:rgba(11,104,176,0);
  --a-ink-00:rgba(11,104,176,0);--a-ink-06:rgba(11,104,176,.06);--a-ink-10:rgba(11,104,176,.10);
  --a-ink-14:rgba(11,104,176,.14);--a-ink-22:rgba(11,104,176,.22);--a-ink-40:rgba(11,104,176,.40);--a-ink-48:rgba(11,104,176,.48);
  --a-ok-12:rgba(47,125,79,.12);--a-ok-20:rgba(47,125,79,.20);
  --a-text-00:rgba(42,33,24,0);--a-text-05:rgba(42,33,24,.05);--a-text-12:rgba(42,33,24,.12);
  --a-text-20:rgba(42,33,24,.20);--a-text-28:rgba(42,33,24,.28);--a-text-45:rgba(42,33,24,.45);
  --a-white-00:rgba(255,255,255,0);--a-white-14:rgba(255,255,255,.14);--a-white-25:rgba(255,255,255,.25);
  --a-white-34:rgba(255,255,255,.34);--a-white-90:rgba(255,255,255,.90);--a-panel-88:rgba(255,251,244,.88);
  --mask-on:#000;--c-clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-display:800;--weight-bold:700;--weight-medium:600;--weight-body:400;
  --r-pill:999px;--r-circle:50%;--r-tray:32px;--r-tray-face:22px;--r-card:16px;--r-large:28px;
  --r-xs:2px;--r-sm:4px;--r-md:8px;--r-item:10px;--r-chip:12px;--r-device:14px;
  --r-screen:6px;--r-list:9px;--r-monitor:17px;--r-bezel:13px;
  --r-phone:34px;--r-phone-bezel:29px;--r-phone-screen:26px;--r-zero:0;
  --sh-tray:0 34px 72px -26px var(--a-ink-22),0 10px 26px -14px var(--a-ink-10),0 0 0 1px var(--a-ink-06);
  --sh-sticker:0 18px 36px -16px var(--a-ink-22),0 4px 10px -4px var(--a-ink-10),0 0 0 1px var(--a-ink-06);
  --sh-panel:inset 0 1px 0 var(--a-white-90),0 18px 40px -28px var(--a-ink-14);
  --gutter:32px;--content-width:1200px;--reading-width:820px;--header-height:64px;--anchor-space:144px;
  --space-section:88px;--gap-grid:12px;--duration-ui:.2s;--duration-reveal:.6s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:80px;scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:var(--c-ink);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
figure,p{margin:0}
ul,ol{padding-left:1.5em}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-display);text-wrap:balance;overflow-wrap:break-word}
h1{margin:0 0 20px;font-size:clamp(52px,5vw,68px);line-height:1.1;letter-spacing:-.02em}
h2{margin:0 0 16px;font-size:clamp(28px,3.5vw,48px);line-height:1.15;letter-spacing:-.02em}
h3{margin:0 0 12px;font-size:24px;line-height:1.3;letter-spacing:-.01em}
h4{font-size:18px;line-height:1.4}
:focus-visible{outline:2px solid var(--c-ink);outline-offset:3px;border-radius:var(--r-md)}
[hidden]{display:none!important}
.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}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.grid{display:grid;gap:var(--gap-grid)}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.flex-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.center{text-align:center}
.muted{color:var(--c-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.panel{padding:32px;border:1px solid var(--c-line);border-radius:var(--r-large);background:var(--c-panel);box-shadow:var(--sh-panel)}
.paper-band{background:var(--c-bg)}
.kraft-band{background:var(--c-kraft)}
.wash-band{background:linear-gradient(160deg,var(--c-wash),var(--c-bg))}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.prose{overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:0 24px}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.prose a{text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;word-break:break-word;background:var(--c-kraft);border-radius:var(--r-sm);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--r-card);padding:24px}
pre code{padding:0;background:var(--c-clear);white-space:pre;overflow-wrap:normal;word-break:normal}
#server-status{position:static;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.reveal{transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:40;opacity:.03;mix-blend-mode:multiply}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 30px;border-radius:var(--r-pill);font-size:16px;font-weight:var(--weight-medium);letter-spacing:.01em;flex-shrink:0;white-space:nowrap;transition:background-color var(--duration-ui),box-shadow var(--duration-ui),color var(--duration-ui)}
.btn:hover{text-decoration:none}
.btn-solid,.btn-primary{background:linear-gradient(180deg,var(--c-ink),var(--c-ink-deep));color:var(--c-white);box-shadow:inset 0 1px 0 var(--a-white-25),0 12px 24px -12px var(--a-ink-48)}
.btn-solid:hover,.btn-primary:hover,.btn-demo-hover{box-shadow:inset 0 1px 0 var(--a-white-25),0 16px 30px -12px var(--a-ink-48)}
.btn-line,.btn-secondary{border:1px solid var(--c-ink);color:var(--c-ink);background:var(--a-ink-00)}
.btn-line:hover,.btn-secondary:hover{background:var(--a-ink-06)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-kraft);color:var(--c-muted);box-shadow:none;border:1px solid var(--c-line)}
.btn-small{min-height:40px;padding:8px 20px;font-size:14px}
.btn-demo-focus{outline:2px solid var(--c-ink);outline-offset:3px}
.cta-row{display:flex;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:26px}
.topbar,#site-header{position:sticky;top:0;z-index:30}
.topbar{background:var(--a-panel-88);-webkit-backdrop-filter:saturate(1.3) blur(14px);backdrop-filter:saturate(1.3) blur(14px);border-bottom:1px solid var(--c-line)}
#site-header .topbar{position:relative}
.topbar-in{max-width:1200px;height:var(--header-height);margin:0 auto;padding:0 var(--gutter);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;justify-self:start;color:var(--c-text)}
.brand:hover{text-decoration:none}
.logo{width:30px;height:30px;flex:none;filter:drop-shadow(0 4px 8px var(--a-ink-22))}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:18px;letter-spacing:-.02em;line-height:1}
.brand-zh{font-size:13px;font-weight:500;color:var(--c-muted);padding-left:10px;border-left:1px solid var(--c-line)}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px}
.nav-list>li>a,.nav-more>button,.nav-more>summary{position:relative;display:inline-flex;align-items:center;gap:4px;height:36px;padding:0 14px;border-radius:var(--r-pill);font-size:14px;color:var(--c-muted);transition:color var(--duration-ui),background-color var(--duration-ui);cursor:pointer;list-style:none}
.nav-more>summary::-webkit-details-marker{display:none}
.nav-list>li>a:hover,.nav-more>button:hover,.nav-more>summary:hover{color:var(--c-text);background:var(--a-text-05);text-decoration:none}
.nav-list .is-active{color:var(--c-text);font-weight:var(--weight-medium)}
.nav-list .is-active::after{content:"";position:absolute;left:50%;bottom:3px;width:14px;height:2px;margin-left:-7px;border-radius:var(--r-xs);background:var(--c-ink)}
.chev{width:10px;height:10px;flex:none}
.chev path{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.nav-more,.language-control{position:relative}
.nav-menu,.language-menu{position:absolute;top:calc(100% + 10px);left:50%;min-width:188px;padding:8px;background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--r-card);box-shadow:var(--sh-sticker);transform:translateX(-50%)}
.nav-menu a,.language-menu a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-item);font-size:14px;color:var(--c-text)}
.nav-menu a:hover,.language-menu a:hover{background:var(--c-kraft);text-decoration:none}
.nav-group{padding:6px 12px 4px;font-size:11px;letter-spacing:.06em;color:var(--c-muted)}
.tools{justify-self:end;display:flex;align-items:center;gap:8px}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:0 12px;border-radius:var(--r-pill);font-size:13px;color:var(--c-muted)}
.lang span{white-space:nowrap}
.lang:hover{color:var(--c-text);background:var(--a-text-05)}
.globe{width:15px;height:15px;flex:none}
.globe circle,.globe path{fill:none;stroke:currentColor;stroke-width:1.5}
.language-menu{left:auto;right:0;transform:none;z-index:4}
.language-menu [aria-current="true"]{background:var(--c-kraft);font-weight:var(--weight-medium)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--r-pill);background:var(--c-text);color:var(--c-panel);font-size:14px;font-weight:var(--weight-medium);white-space:nowrap;box-shadow:inset 0 1px 0 var(--a-white-25),0 6px 14px -8px var(--a-text-45)}
.login:hover{background:var(--c-text-soft);text-decoration:none}
.hamburger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--r-pill)}
.hamburger svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round}
.mobile-drawer{display:none}
html.nav-open{overflow:hidden}
.site-footer{background:var(--c-kraft);border-top:1px solid var(--c-line);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{color:var(--c-muted);margin-top:18px;max-width:360px}
.footer-title{font-size:14px;font-weight:var(--weight-bold);margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 16px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;color:var(--c-text);font-size:14px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:13px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--c-line);font-size:13px;color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{min-height:24px;display:inline-flex;align-items:center;color:var(--c-text)}
@media(max-width:1100px){
  .topbar-in{gap:12px}
  .nav-list>li>a,.nav-more>button,.nav-more>summary{padding-inline:10px}
}
@media(max-width:900px){
  .topbar-in{display:flex}
  .desktop-nav{display:none}
  .tools{margin-left:auto}
  .hamburger{display:inline-flex}
  .mobile-drawer{position:absolute;left:0;right:0;top:var(--header-height);background:var(--c-panel);border-bottom:1px solid var(--c-line);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:12px var(--gutter) 24px;box-shadow:var(--sh-sticker)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer a{display:flex;width:100%;align-items:center;min-height:44px;padding:12px 16px;border-radius:var(--r-item);color:var(--c-text)}
  .mobile-drawer a:hover,.mobile-drawer a.is-active{background:var(--c-kraft);text-decoration:none}
  .drawer-languages{border-top:1px solid var(--c-line);margin-top:12px;padding-top:12px}
  .drawer-label{font-size:12px;color:var(--c-muted);padding:8px 16px}
  .footer-grid{gap:24px}
}
@media(max-width:768px){
  h1{font-size:36px}
  h2{font-size:32px}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px;--space-section:56px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-region{max-width:100%;overflow-x:clip}
  .grid-two{grid-template-columns:1fr}
  .topbar-in{gap:8px}
  .tools{margin-left:auto;gap:4px}
  .lang{padding-inline:8px}
  .lang .lang-label{display:none}
  .login{padding-inline:14px;min-height:40px}
  .logo{width:28px;height:28px}
  .brand{gap:7px}
  .brand-en{font-size:16px}
  .panel{padding:24px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  pre{padding:16px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}