/* A visual, progressively disclosed introduction to A2A. */
.a2a-page{max-width:1120px}.a2a-intro{padding:48px 0 12px}.back-link{display:inline-flex;min-height:44px;align-items:center;font-size:14px;color:var(--muted);margin-bottom:28px}.a2a-intro .eyebrow{margin-bottom:22px}.a2a-intro h1{font-size:clamp(40px,5.8vw,70px);letter-spacing:-2.9px;line-height:1.12}.a2a-lead{font-size:19px;max-width:740px;line-height:1.8;margin-top:26px}.a2a-lead strong{color:var(--text)}.preview-note{font-size:13px;margin-top:18px;max-width:720px}.a2a-jump{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:24px;font-size:14px;font-weight:700}.a2a-jump a{min-height:44px;display:inline-flex;align-items:center;color:var(--purple)}
.a2a-section{padding-top:72px;scroll-margin-top:30px}.a2a-section-heading{max-width:730px;margin-bottom:28px}.a2a-section-heading .eyebrow{margin-bottom:14px}.a2a-section h2{font-size:clamp(29px,4vw,40px);letter-spacing:-1.3px;line-height:1.2}.a2a-section-heading>p:last-child{margin-top:18px;font-size:17px}.a2a-page h3{font-size:20px;line-height:1.4;letter-spacing:-.5px}.a2a-page figure{margin:0}.handoff-diagram{padding:28px;border:1px solid var(--line);background:var(--surface);border-radius:26px}.handoff-flow{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:minmax(0,1fr) 56px minmax(0,1.12fr) 56px minmax(0,1fr);align-items:stretch}.flow-node{min-width:0;border:1px solid var(--line);border-radius:19px;padding:22px;background:var(--bg)}.flow-node p{font-size:14px;line-height:1.8;margin-top:12px}.node-symbol{display:flex;align-items:center;height:44px;font-size:36px;color:var(--purple)}.flow-node img{display:block}.node-kicker{display:block;font-size:10px;font-weight:800;letter-spacing:.7px;line-height:1.7;margin:22px 0 9px;color:var(--muted)}.node-detail{display:block;margin-top:22px;font-size:12px;font-weight:700;color:var(--purple)}.daemon-node{background:var(--accent-soft);border-color:var(--purple)}.worker-node{background:var(--surface-soft)}.flow-arrow{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:2px;color:var(--purple)}.flow-arrow span{font-size:10px;font-weight:700}.flow-arrow b{font-size:27px;font-weight:500}.return-path{display:flex;gap:18px;align-items:center;border:1px dashed var(--control-line);border-radius:14px;margin-top:20px;padding:16px 20px}.return-path>span{font-size:30px;color:var(--purple)}.return-path p{font-size:14px;line-height:1.7}.return-path strong{display:block;color:var(--text)}.a2a-page figcaption{font-size:12px;color:var(--muted);line-height:1.8;margin-top:16px}
.task-journey ol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));list-style:none;margin:0;padding:0;gap:24px}.task-journey li{border-top:2px solid var(--line);padding-top:20px}.journey-number{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;color:var(--purple);background:var(--accent-soft);font-weight:800;margin-bottom:20px}.journey-label{font-size:10px;font-weight:800;letter-spacing:1px;color:var(--purple)}.task-journey h3{margin:12px 0}.task-journey p{font-size:14px;line-height:1.8}.a2a-note{display:flex;align-items:baseline;gap:10px 20px;flex-wrap:wrap;background:var(--surface-soft);border-radius:16px;padding:20px 24px;margin-top:28px;font-size:14px}.a2a-note p{flex:1;min-width:180px}
.a2a-access-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.a2a-access-grid article{padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--surface)}.access-icon{display:flex;align-items:center;justify-content:center;font-size:25px;color:var(--purple);background:var(--accent-soft);width:44px;height:44px;border-radius:14px;margin-bottom:18px}.a2a-access-grid p{font-size:14px;line-height:1.85;margin-top:12px}.protocol-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.protocol-pair article{border:1px solid var(--line);border-radius:22px;padding:28px;background:var(--surface)}.protocol-label{display:inline-block;color:var(--purple);background:var(--accent-soft);border-radius:8px;padding:4px 10px;font-size:12px;font-weight:800;margin-bottom:20px}.protocol-pair h3{font-size:23px}.protocol-pair p{font-size:15px;margin-top:14px}.mini-flow{display:flex;align-items:center;gap:10px;margin-top:28px;font-size:12px;font-weight:750}.mini-flow span{padding:8px 10px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}.mini-flow b{color:var(--purple)}.comparison-note{font-size:14px;margin-top:20px;max-width:730px}
.builder-section details{border:1px solid var(--line);border-radius:18px;background:var(--surface);overflow:hidden}.builder-section summary{display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;padding:22px 24px;font-weight:700;font-size:16px;list-style:none}.builder-section summary::-webkit-details-marker{display:none}.builder-section summary>span{color:var(--purple);font-size:24px;font-weight:400}.builder-section details[open] summary>span{transform:rotate(45deg)}.builder-details{padding:0 24px 24px}.builder-details dl{margin:0}.builder-details dl>div{display:grid;grid-template-columns:145px minmax(0,1fr);gap:16px;padding:18px 0;border-top:1px solid var(--line);font-size:14px}.builder-details dt{font-weight:800}.builder-details dd{margin:0;color:var(--muted);line-height:1.8;overflow-wrap:anywhere}.builder-details code{font-size:12px;background:var(--surface-soft);padding:3px 5px;border-radius:5px;overflow-wrap:anywhere}.a2a-next{display:flex;justify-content:space-between;align-items:center;gap:24px;background:var(--accent-soft);padding:30px;border-radius:20px;margin-top:28px}.a2a-next p{font-size:15px}.a2a-next strong{color:var(--text);font-size:20px}.a2a-next .button{flex-shrink:0}
@media(max-width:1000px){.handoff-diagram{padding:20px}.flow-node{padding:16px}.handoff-flow{grid-template-columns:minmax(0,1fr) 40px minmax(0,1.1fr) 40px minmax(0,1fr)}}
@media(max-width:760px){.handoff-flow{grid-template-columns:1fr}.flow-node{padding:24px}.flow-arrow{padding:14px 0;gap:0}.flow-arrow b{transform:rotate(90deg);line-height:1}.flow-arrow span{order:2;margin-top:9px}.node-kicker{margin-top:16px}.node-detail{margin-top:16px}.task-journey ol{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.a2a-access-grid{grid-template-columns:1fr}.protocol-pair{grid-template-columns:1fr}.a2a-section{padding-top:54px}.a2a-next{align-items:flex-start;flex-direction:column}.a2a-intro h1{letter-spacing:-1.8px}.a2a-lead{font-size:17px}}
@media(max-width:420px){.a2a-page.wrap{width:calc(100% - 36px)}.a2a-intro{padding-top:25px}.a2a-intro h1{font-size:38px}.a2a-intro h1 br{display:none}.a2a-intro .eyebrow{font-size:10px;letter-spacing:.7px}.handoff-diagram{padding:14px}.flow-node{padding:20px}.task-journey ol{grid-template-columns:1fr}.task-journey li{display:flex;gap:18px}.journey-number{flex-shrink:0;margin:0}.task-journey h3{margin-top:8px}.builder-details dl>div{grid-template-columns:1fr;gap:6px}.builder-section summary,.builder-details{padding-left:18px;padding-right:18px}.protocol-pair article{padding:22px}.mini-flow{gap:6px;font-size:11px}.mini-flow span{padding:8px}.return-path{padding:15px;align-items:flex-start}.a2a-next{padding:24px}}