.echo-page{--echo-paper:#f7f8f7;--echo-white:#fff;--echo-ink:#172c2a;--echo-muted:#52635f;--echo-accent:#155f57;--echo-line:#dbe2df;background:var(--echo-paper);color:var(--echo-ink)}.echo-page :where(h1,h2,h3,p,figure){margin:0}.echo-page :where(h1,h2,h3){text-wrap:balance}.echo-page :where(p){text-wrap:pretty}.echo-page :where(a,button,[tabindex]):focus-visible{outline-offset:5px;outline:3px solid #5865f2}.echo-shell{width:min(1180px,100% - 64px);margin-inline:auto}.echo-context{border-bottom:1px solid var(--echo-line);color:var(--echo-muted);align-items:center;gap:12px;padding-block:25px;font-size:12px;display:flex}.echo-context a:hover{color:var(--echo-accent)}.echo-context-site{gap:12px;margin-left:auto;font-family:Consolas,monospace;display:inline-flex}.echo-intro{grid-template-columns:1.3fr 1fr;align-items:center;gap:80px;padding-block:76px 88px;display:grid}.echo-brand{align-items:center;gap:12px;display:flex}.echo-brand img{flex:none;width:48px;height:48px}.echo-brand strong{font:750 21px/1.4 Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;display:block}.echo-brand div>span{color:var(--echo-muted);margin-top:3px;font-size:12px;display:block}.echo-intro h1{letter-spacing:-.045em;margin-block:32px 26px;font-size:clamp(40px,4.4vw,64px);line-height:1.3}.echo-intro h1>span{color:var(--echo-accent)}.echo-lead{max-width:510px;color:var(--echo-muted);font-size:17px;line-height:1.95}.echo-actions{flex-wrap:wrap;align-items:center;gap:26px;margin-top:32px;display:flex}.echo-button{border-radius:7px;justify-content:center;align-items:center;gap:20px;min-height:50px;padding:13px 23px;font-size:14px;font-weight:650;transition:background .16s;display:inline-flex}.echo-button--primary{color:#fff;background:var(--echo-accent)}.echo-button--primary:hover{background:#104840}.echo-text-link{min-height:44px;color:var(--echo-accent);align-items:center;gap:10px;font-size:14px;font-weight:650;display:inline-flex}.echo-text-link:hover{text-underline-offset:5px;text-decoration:underline}.echo-intro-note{color:var(--echo-muted);font-size:12px;margin-top:20px!important}.echo-intro-note span{color:#82928d;margin-inline:10px}.echo-evidence{border:1px solid var(--echo-line);background:#fff;border-radius:12px;padding:30px 32px 26px;box-shadow:0 12px 34px #172c2a0a}.echo-evidence-label{color:var(--echo-muted);justify-content:space-between;gap:16px;font-size:11px;display:flex}.echo-evidence-label>span:first-child{color:var(--echo-accent)}.echo-question{letter-spacing:-.03em;font-family:Noto Serif SC,Songti SC,serif;font-size:clamp(22px,2.4vw,31px);line-height:1.6;margin-top:28px!important}.echo-evidence-line{border-left:1px solid #a3beb5;height:38px;margin-left:7px;position:relative}.echo-evidence-line span{background:var(--echo-accent);border-radius:50%;width:5px;height:5px;position:absolute;bottom:0;left:-3px}.echo-answer{border-left:2px solid var(--echo-accent);background:#eef4f1;padding:16px 20px}.echo-small-label,.echo-kicker{letter-spacing:.08em;color:var(--echo-accent);font-size:11px;font-weight:700}.echo-answer>p{margin-top:7px;font-size:15px;line-height:1.85}.echo-origin{color:var(--echo-muted);align-items:flex-start;gap:12px;margin-top:22px;font-size:12px;line-height:1.8;display:flex}.echo-origin>span{color:var(--echo-accent);font-size:22px}.echo-evidence-note{border-top:1px solid var(--echo-line);color:var(--echo-muted);padding-top:22px;font-size:11px;margin-top:24px!important}.echo-purpose{border-block:1px solid var(--echo-line);grid-template-columns:1fr 1.1fr;gap:95px;padding-block:56px 68px;display:grid}.echo-purpose h2{margin-top:14px;font-size:clamp(25px,2.6vw,35px);line-height:1.5}.echo-purpose-copy{color:var(--echo-muted);gap:16px;font-size:15px;line-height:1.95;display:grid}.echo-workflow{padding-block:84px 70px}.echo-section-heading h2{margin-top:14px;font-size:clamp(27px,3vw,40px);line-height:1.45}.echo-section-heading>p:last-child:not(.echo-kicker){max-width:680px;color:var(--echo-muted);margin-top:17px;font-size:15px}.echo-journey{grid-template-columns:repeat(3,1fr);gap:24px;margin-block:35px 38px;display:grid}.echo-journey>p{border-top:1px solid var(--echo-line);color:var(--echo-muted);padding-top:20px;font-size:12px}.echo-journey span{color:var(--echo-accent);font-family:Consolas,monospace;font-size:11px}.echo-journey strong{color:var(--echo-ink);margin-block:8px 4px;font-size:16px;font-weight:650;display:block}.echo-explorer{border:1px solid var(--echo-line);background:var(--echo-white);border-radius:10px;overflow:hidden}.echo-scene-tabs{border-bottom:1px solid var(--echo-line);grid-template-columns:repeat(3,1fr);display:grid}.echo-scene-tabs[hidden],.echo-scene-panel[hidden]{display:none}.echo-scene-tabs button{color:var(--echo-muted);cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;padding:18px;font-family:inherit;font-size:14px;font-weight:600;line-height:1.6}.echo-scene-tabs button>span{opacity:.65;margin-right:12px;font:11px/1 Consolas,monospace}.echo-scene-tabs button[aria-selected=true]{border-bottom-color:var(--echo-accent);color:var(--echo-accent);background:#eef4f1}.echo-scene-tabs button:hover{background:#f4f7f5}.echo-scene-panel{grid-template-columns:.8fr 1.7fr;align-items:center;gap:38px;min-height:414px;padding:38px 42px;display:grid}.echo-scene-panel+.echo-scene-panel:not([hidden]){border-top:1px solid var(--echo-line)}.echo-scene-copy h3{margin-block:15px 18px;font-size:clamp(22px,2.25vw,29px);line-height:1.55}.echo-scene-copy>p{color:var(--echo-muted);font-size:14px;line-height:1.9}.echo-scene-figure{min-width:0}.echo-screenshot{border:1px solid var(--echo-line);background:#f3f5f4;border-radius:6px;place-items:center;min-height:290px;display:grid;overflow:hidden}.echo-screenshot img{width:100%;height:auto;display:block}.echo-scene-panel--compact .echo-screenshot{padding:24px}.echo-scene-panel--compact .echo-screenshot img{border:1px solid var(--echo-line);border-radius:8px;max-width:340px;box-shadow:0 8px 24px #172c2a17}.echo-scene-figure figcaption{text-align:right;color:var(--echo-muted);margin-top:12px;font-size:11px}.echo-workflow-link{margin-top:18px}.echo-demo{color:#f4f7f5;background:#192b29;padding-block:64px}.echo-demo-layout{grid-template-columns:.7fr 1.3fr;align-items:center;gap:65px;display:grid}.echo-demo .echo-kicker{color:#abd1c4}.echo-demo-copy h2{margin-block:14px 20px;font-size:clamp(28px,3vw,40px);line-height:1.4}.echo-demo-copy>p:not(.echo-kicker){color:#c2cfca;font-size:14px;line-height:1.9}.echo-demo-copy .echo-text-link{color:#c7e8db;margin-top:16px}.echo-demo-figure video{aspect-ratio:16/9;background:#112421;border:1px solid #52615b;border-radius:8px;width:100%;display:block}.echo-demo-figure figcaption{color:#c2cfca;margin-top:12px;font-size:11px}.echo-boundaries{padding-block:80px 64px}.echo-boundary-grid{grid-template-columns:1fr 1fr;gap:64px;margin-block:36px 28px;display:grid}.echo-boundary-grid article{border-top:1px solid var(--echo-line);padding-top:22px}.echo-boundary-grid h3{margin-block:12px;font-size:24px}.echo-boundary-grid p{color:var(--echo-muted);font-size:14px;line-height:1.95}.echo-boundary-note{color:var(--echo-muted);background:#eef2ef;border-left:2px solid #a3b8af;padding:16px 20px;font-size:12px}.echo-boundaries>.echo-text-link{margin-top:12px}.echo-official{border-top:1px solid var(--echo-line);grid-template-columns:1fr 1fr;align-items:center;gap:100px;padding-block:62px 84px;display:grid}.echo-official .echo-brand img{width:38px;height:38px}.echo-official .echo-brand strong{font-size:18px}.echo-official h2{margin-block:20px;font-size:clamp(34px,4vw,52px);line-height:1.4}.echo-official-main>p{color:var(--echo-muted);font-size:15px;line-height:1.9}.echo-official-main>.echo-button{margin-top:24px}.echo-official-resources>a{border-bottom:1px solid var(--echo-line);justify-content:space-between;align-items:center;gap:16px;padding:22px 0;display:flex}.echo-official-resources strong{font-size:15px;font-weight:650;display:block}.echo-official-resources div>span{color:var(--echo-muted);margin-top:5px;font-size:12px;display:block}.echo-official-resources a>span{color:var(--echo-accent);font-size:20px}.echo-official-resources a:hover strong{color:var(--echo-accent)}.echo-official-resources>p{color:var(--echo-muted);margin-top:22px;font-size:12px;line-height:1.9}@media (width<=1000px){.echo-intro{gap:36px}.echo-purpose,.echo-official{gap:45px}.echo-scene-panel{gap:28px;padding:30px}.echo-demo-layout{gap:36px}}@media (width<=760px){.echo-shell{width:calc(100% - 40px)}.echo-intro{grid-template-columns:1fr;gap:36px;padding-block:42px 48px}.echo-intro h1{font-size:clamp(38px,7.8vw,54px)}.echo-evidence{width:100%;max-width:540px}.echo-question{font-size:28px}.echo-purpose{grid-template-columns:1fr;gap:24px;padding-block:36px}.echo-workflow,.echo-boundaries{padding-block:48px}.echo-scene-panel{grid-template-columns:1fr;gap:24px;min-height:0;padding:26px}.echo-scene-copy h3{margin-block:10px}.echo-screenshot{min-height:0}.echo-scene-panel--compact .echo-screenshot{min-height:290px}.echo-demo-layout{grid-template-columns:1fr;gap:30px}.echo-demo{padding-block:44px}.echo-demo-copy h2 br{display:none}.echo-demo-copy>p{max-width:540px}.echo-boundary-grid{grid-template-columns:1fr;gap:28px}.echo-official{grid-template-columns:1fr;gap:28px;padding-block:42px 56px}}@media (width<=480px){.echo-context{gap:8px;font-size:10px}.echo-context-site{gap:5px}.echo-lead{font-size:15px}.echo-actions{gap:18px}.echo-evidence{padding:24px}.echo-journey{gap:14px}.echo-journey strong{font-size:13px}.echo-journey>p{font-size:11px}.echo-scene-tabs button{padding:14px 4px;font-size:12px}.echo-scene-tabs button>span{display:none}.echo-scene-panel{padding:22px 18px}.echo-scene-panel--compact .echo-screenshot{min-height:0;padding:16px}.echo-scene-figure figcaption{text-align:left}}@media (prefers-reduced-motion:reduce){.echo-page *,.echo-page :before,.echo-page :after{scroll-behavior:auto!important;transition:none!important}}