:root{--ink:#1d1d1f;--paper:#fff;--soft:#f5f5f7;--muted:#626267;--line:#d2d2d7;--blue:#0066cc;--hover:#0055ad;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Helvetica,"Microsoft YaHei",Arial,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:124px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
:lang(zh-CN){line-break:strict;word-break:normal}
h1,h2,h3{font-weight:600;line-height:1.18;letter-spacing:-.025em;text-wrap:balance}
h1{font-size:56px;margin:20px 0}
h2{font-size:48px;margin:0 0 20px}
h3{font-size:36px;margin:16px 0}
p{margin:12px 0}
a{color:var(--blue);text-underline-offset:4px}
a,button,select,summary{touch-action:manipulation;min-height:44px}
a{display:inline-flex;align-items:center}
button,input,textarea,select{font:inherit}
button{min-width:44px;padding:10px 8px;border:0;background:none;color:var(--blue);cursor:pointer}
button:hover,a:hover{color:var(--hover)}
button:disabled{cursor:default;opacity:.5}
:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
[hidden]{display:none!important}
.wrap{width:min(1120px,calc(100% - 64px));margin-inline:auto}
.section{padding-block:96px}
.eyebrow,.badge{font-size:13px;font-weight:500;letter-spacing:.025em;color:var(--muted)}
.small{font-size:13px;color:var(--muted)}
.skip-link{position:fixed;top:12px;left:12px;z-index:100;padding:10px 18px;background:#fff;border-radius:12px;transform:translateY(-160%)}
.skip-link:focus{transform:none}
.site-header{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid #ededf0}
.nav{width:min(1200px,calc(100% - 48px));margin:auto;min-height:104px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{color:var(--ink);text-decoration:none;gap:16px;flex-shrink:0;white-space:nowrap}
.brand small{font-size:12px;font-weight:500;letter-spacing:.1em}
.brand-logo{display:block;height:88px;width:auto;object-fit:contain}
.nav-links{display:flex;gap:32px;font-size:13px}
.nav-links a{color:var(--ink);text-decoration:none}
.nav-links a:hover{color:var(--blue)}
.menu-button{display:none;color:var(--ink);font-size:14px;border:1px solid var(--line);border-radius:24px;padding-inline:16px}
.hero{text-align:center;padding:80px 0 72px}
.hero .eyebrow{margin:0;color:var(--blue)}
.hero-sub{font-size:28px;letter-spacing:-.015em;margin:20px 0 30px}
.actions{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 22px;border:1px solid var(--blue);border-radius:28px;font-size:16px;line-height:1.5;text-decoration:none;cursor:pointer}
.primary{background:var(--blue);color:#fff}
.primary:hover{background:var(--hover);border-color:var(--hover);color:#fff}
.outline{color:var(--blue);background:transparent}
.outline:hover{background:#eaf3fc}
.hero .actions,.contact .actions{justify-content:center}
.section-heading{text-align:center;margin-bottom:48px}
.section-heading p{color:var(--muted);margin:0}
.services{background:var(--soft)}
.product-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.product{display:flex;flex-direction:column;align-items:center;text-align:center;padding:44px 32px 40px;background:#fff;border-radius:24px;scroll-margin-top:124px}
.product .badge{margin:0}
.product>p:not(.badge){max-width:360px;margin:0 0 30px;color:var(--muted)}
.product .actions{justify-content:center;gap:12px;margin-top:auto}
.product .button{font-size:14px;padding:9px 18px;min-height:44px}
.services noscript p{text-align:center;font-size:14px;margin-top:30px}
.integration{background:var(--ink);color:#f5f5f7;text-align:center}
.integration .section{padding-block:104px}
.integration h2{font-size:64px;margin-bottom:24px}
.panel-copy{font-size:24px;max-width:660px;margin:0 auto 24px;text-wrap:balance}
.concept-note{font-size:13px;color:#b6b6bd;margin-bottom:24px}
.integration .primary{background:#0071e3;border-color:#0071e3}
.integration .primary:hover{background:#0066cc}
.integration :focus-visible{outline-color:#80bcff}
.contact{text-align:center}
.contact h2{font-size:40px}
.contact .section>p:not(.small){color:var(--muted)}
.contact .actions{margin:30px 0 16px;gap:12px 20px}
.contact .actions>a{font-size:16px;text-decoration:none}
#copy-email{font-size:13px}
#email-status{margin-bottom:4px}
#contact-data-warning{margin-top:4px}
.contact-shortcuts{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid #e8e8ed;scroll-margin-top:124px}
.contact-shortcuts button{font-size:14px}
.footer{display:flex;justify-content:space-between;align-items:baseline;gap:20px;padding-block:24px;font-size:12px;color:var(--muted);border-top:1px solid #e8e8ed}
.footer>div{display:flex;gap:8px 22px;flex-wrap:wrap;min-width:0}
.footer a{color:var(--muted);text-decoration:none}
.footer p{margin:0}
summary{cursor:pointer;align-content:center}
.analytics-panel{font-size:13px;margin-top:32px;padding-top:16px;border-top:1px solid var(--line)}
.footer .analytics-panel{margin:0;padding:0;border:0;max-width:350px}
.analytics-options{display:flex;flex-wrap:wrap;gap:8px 20px}
.signal-choice{position:relative;display:flex;align-items:center;justify-content:center;gap:0 16px;flex-wrap:wrap;max-width:700px;margin:32px auto 0;color:var(--muted);font-size:12px}
.signal-choice p{margin:0}
.signal-choice button{font-size:12px;padding:8px 4px}
.signal-choice .analytics-options{gap:12px}
.signal-choice details{text-align:left}
.signal-choice summary{font-size:12px;text-decoration:underline;text-underline-offset:3px}
.signal-choice details[open]{flex-basis:100%;text-align:center;padding:8px 16px;background:var(--soft);border-radius:12px}
dialog{border:1px solid #e8e8ed;border-radius:24px;background:var(--paper);color:var(--ink);padding:32px;width:min(640px,calc(100% - 32px));max-height:calc(100dvh - 40px);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 24px 100px #0003}
dialog::backdrop{background:#0008}
body:has(dialog[open]){overflow:hidden}
.close{display:block;margin-left:auto;font-size:14px;border-radius:24px;background:var(--soft);color:var(--ink);padding-inline:16px}
dialog h2{font-size:32px;margin-top:20px}
dialog h3{font-size:21px;letter-spacing:0;margin-top:24px}
dialog li{margin-block:8px}
.sample-label,.local-note{font-size:14px;color:var(--muted)}
dialog form{display:grid;gap:10px;margin-top:24px}
dialog label{font-size:14px}
textarea,select{padding:10px 12px;border:1px solid #86868b;border-radius:10px;background:#fff;color:var(--ink);max-width:100%}
textarea{width:100%;resize:vertical}
pre{font-size:12px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7;max-width:100%}
#draft{border-top:1px solid var(--line);margin-top:24px;padding-top:12px}
#draft-text{max-height:220px;overflow:auto;padding:16px;background:var(--soft);border-radius:12px}
#a2a-dialog{width:min(800px,calc(100% - 32px))}
.a2a-workspace{margin-top:24px}
.a2a-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.a2a-toolbar label,.a2a-toolbar button{font-size:14px}
.stages{display:flex;list-style:none;counter-reset:stage;gap:12px;padding:0;margin:28px 0}
.stages li{flex:1;font-size:12px;color:var(--muted);border-top:2px solid var(--line);padding-top:10px;counter-increment:stage}
.stages li::before{content:counter(stage,decimal-leading-zero);display:block;margin-bottom:6px}
.stages li[aria-current=step]{color:var(--blue);border-color:var(--blue);font-weight:600}
.sample-panel{background:var(--soft);padding:20px;border-radius:16px;margin-bottom:16px}
.sample-panel h3{margin-top:12px}
.sample-panel p{font-size:14px}
.resource-links{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:13px;margin-bottom:0}
.document{max-width:760px;min-height:65vh;padding-block:64px}
.document h1{font-size:42px}
.document h2{font-size:26px;margin-top:36px;letter-spacing:0}
.document ul{padding-left:22px}
.document p a{display:inline;min-height:0}
@media(max-width:850px){
  .nav-links{gap:20px}
  .brand small{display:none}
  .wrap{width:calc(100% - 48px)}
  .section{padding-block:72px}
  .product{padding:36px 24px}
  .product h3{font-size:30px}
  .product .actions{gap:8px}
  .product .button{padding-inline:14px}
  .stages{flex-wrap:wrap}
  .stages li{flex:1 1 26%}
}
@media(max-width:600px){
  .wrap,.nav{width:calc(100% - 36px)}
  .nav{flex-wrap:wrap;gap:0 16px;padding-block:8px;min-height:104px}
  .menu-button{display:block}
  .nav-links{width:100%;display:flex;flex-wrap:wrap;gap:4px 24px;padding:8px 0 4px}
  .js .nav-links{display:none}
  .js .nav-links.open{display:flex}
  .hero{padding:52px 0 44px}
  h1{font-size:clamp(32px,8.5vw,44px);letter-spacing:-.035em;margin:20px 0}
  h2{font-size:34px}
  .hero-sub{font-size:23px;margin:20px 0 28px}
  .hero .actions{gap:10px}
  .hero .button{font-size:14px;padding-inline:18px}
  .signal-choice{margin-top:24px;gap:0 12px}
  .signal-choice>p{flex-basis:100%}
  .section{padding-block:56px}
  .section-heading{margin-bottom:30px}
  .section-heading p{font-size:15px}
  .product-grid{grid-template-columns:1fr;gap:16px}
  .product{padding:36px 20px;border-radius:20px}
  .product h3{font-size:32px}
  .product>p:not(.badge){font-size:16px;margin-bottom:24px}
  .integration .section{padding-block:72px}
  .integration h2{font-size:48px}
  .panel-copy{font-size:21px;max-width:300px}
  .contact h2{font-size:32px}
  .contact .actions{gap:8px 16px}
  .contact-shortcuts{gap:4px 20px;margin-top:24px}
  .footer{flex-direction:column;gap:8px;padding-block:24px}
  .footer>div{gap:0 20px}
  dialog{padding:20px;border-radius:20px}
  dialog h2{font-size:28px}
  .a2a-toolbar label{width:100%}
  .sample-panel{padding:16px}
  .document{padding-block:40px}
  .document h1{font-size:34px}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}