/* a2ahello public pages. One accent, system fonts, no external resources. Light and dark via prefers-color-scheme. */
:root{--bg:#fff;--surface:#f5f6f8;--raised:#fff;--ink:#12151c;--muted:#4a5261;--line:#e0e3e9;--accent:#4338ca;--accent-ink:#fff;--accent-soft:#eceefd;--ok:#166534;--bad:#b42318;--code-bg:#10141c;--code-ink:#e4e7ee;--code-muted:#9aa3b2;color-scheme:light dark}
@media (prefers-color-scheme:dark){:root{--bg:#0c0f15;--surface:#121721;--raised:#161c28;--ink:#e9ecf2;--muted:#a7afbd;--line:#273041;--accent:#a5b4fc;--accent-ink:#0c0f15;--accent-soft:#1c2242;--ok:#86efac;--bad:#fca5a5;--code-bg:#080a0f;--code-ink:#e4e7ee;--code-muted:#9aa3b2}}
*{box-sizing:border-box}
html{scroll-padding-top:5rem;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}.btn,.scan button{transition:background-color .15s,border-color .15s}}
body{margin:0;font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);overflow-wrap:break-word}
.wrap{max-width:72rem;margin:0 auto;padding:0 16px}
a{color:var(--accent);text-underline-offset:.15em}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
main:focus{outline:none}
.skip{position:absolute;left:16px;top:-4rem;background:var(--bg);color:var(--ink);padding:.5rem 1rem;border:1px solid var(--line);border-radius:8px;z-index:20}.skip:focus{top:.5rem}
.muted{color:var(--muted)}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0}
h2{font-size:clamp(1.65rem,3.6vw,2.3rem);font-weight:750;max-width:24ch}
h3{font-size:1.1rem;font-weight:650;letter-spacing:-.01em;margin-bottom:.4rem}
p{margin:0 0 1rem}
/* Header */
.top{position:sticky;top:0;z-index:10;background:var(--bg);background:color-mix(in srgb,var(--bg) 90%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-height:4rem}
.brand{font-weight:800;font-size:1.2rem;letter-spacing:-.03em;text-decoration:none;color:var(--ink);display:inline-flex;align-items:center;gap:.45rem}
.brand svg{width:1.6rem;height:1.6rem}
.nav{display:flex;align-items:center;gap:.25rem 1.25rem}
.nav a:not(.btn){color:var(--ink);text-decoration:none;font-weight:550;font-size:.95rem}.nav a:not(.btn):hover{color:var(--accent)}
@media (max-width:34rem){.nav .alt{display:none}.nav{gap:.85rem}}
/* Buttons */
.btn,.scan button{display:inline-flex;align-items:center;justify-content:center;font:inherit;font-weight:650;line-height:1.2;border-radius:10px;padding:.8rem 1.3rem;text-decoration:none;border:1px solid transparent;cursor:pointer}
.btn-primary,.scan button{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover,.scan button:hover{background:color-mix(in srgb,var(--accent) 86%,var(--ink))}
.btn-ghost{background:var(--raised);color:var(--ink);border-color:var(--line)}.btn-ghost:hover{border-color:var(--accent)}
.btn-sm{padding:.5rem .9rem;font-size:.92rem;border-radius:9px}
.btns{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
button:disabled{opacity:.6;cursor:wait}
/* Hero */
.hero{padding:clamp(3rem,8vw,6rem) 0 clamp(3rem,7vw,5rem);background:radial-gradient(60rem 30rem at 85% -10%,var(--accent-soft),transparent 70%)}
.hero .wrap{display:grid;gap:3rem;align-items:center}
@media (min-width:62rem){.hero .wrap{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin:0 0 1rem}
.hero h1{font-size:clamp(2.3rem,6.2vw,4rem);font-weight:800;letter-spacing:-.035em;max-width:16ch;margin-bottom:1.25rem}
.lede{font-size:clamp(1.08rem,2.2vw,1.3rem);color:var(--muted);max-width:38rem;margin-bottom:2rem}
.cta{background:var(--raised);border:1px solid var(--line);border-radius:16px;padding:1.25rem;max-width:40rem;box-shadow:0 1px 2px rgb(0 0 0/.04),0 12px 32px -16px rgb(0 0 0/.18)}
.scan label{display:block;font-weight:650;margin-bottom:.4rem}
.row{display:flex;flex-wrap:wrap;gap:.6rem}
.row input{flex:1 1 15rem;min-width:0}
input{font:inherit;color:inherit;background:var(--bg);border:1px solid var(--muted);border-radius:10px;padding:.75rem .85rem}
.scan .help{font-size:.9rem;color:var(--muted);margin:.6rem 0 0}
.or{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--line);font-size:.95rem;color:var(--muted)}
.trust{font-size:.92rem;color:var(--muted);margin:1rem 0 0;display:flex;align-items:center;gap:.5rem}
.trust svg{flex:none;width:1.1rem;height:1.1rem;stroke:var(--ok);fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
#status:not(:empty){border:1px solid var(--line);background:var(--bg);border-radius:10px;padding:.25rem 1rem;margin-top:1rem}
/* Relay: the plain-words A2A diagram in the hero */
.relay{list-style:none;margin:0;padding:0;display:grid;gap:0}
.relay li{position:relative;background:var(--raised);border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem 1rem 3.6rem}
.relay li+li{margin-top:1.75rem}
.relay li+li::before{content:"";position:absolute;left:1.95rem;top:-1.8rem;height:1.75rem;border-left:2px dashed var(--accent)}
.relay .dot{position:absolute;left:1rem;top:1rem;width:1.9rem;height:1.9rem;border-radius:50%;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);font-weight:750;font-size:.85rem}
.relay .ours{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.relay strong{display:block}.relay span.d{color:var(--muted);font-size:.93rem}
/* Sections */
.sec{padding:clamp(3.5rem,8vw,6rem) 0}
.alt{background:var(--surface);border-block:1px solid var(--line)}
.head{max-width:44rem;margin-bottom:2.25rem}
.head p{font-size:1.1rem;color:var(--muted);margin:1rem 0 0}
.kicker{font-size:.8rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin:0 0 .75rem}
.prose{max-width:44rem}.prose p{font-size:1.08rem}
.split{display:grid;gap:2.5rem;align-items:start}
@media (min-width:58rem){.split{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr)}}
.grid{list-style:none;padding:0;margin:0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,16rem),1fr))}
.card{background:var(--raised);border:1px solid var(--line);border-radius:14px;padding:1.35rem}
.card p{margin:0;color:var(--muted)}
.card p+p{margin-top:.6rem}
.icon{display:block;width:2.6rem;height:2.6rem;margin-bottom:1rem;padding:.55rem;border-radius:11px;background:var(--accent-soft);fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.tag{display:inline-block;vertical-align:middle;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;border-radius:999px;padding:.12rem .55rem;margin-left:.35rem;border:1px solid currentColor;white-space:nowrap}
.tag.live{color:var(--ok)}.tag.build{color:var(--muted)}
.stat .num{display:block;font-size:clamp(2rem,4.5vw,2.6rem);font-weight:800;letter-spacing:-.03em;color:var(--accent);line-height:1.1;margin-bottom:.6rem}
.stat p{color:var(--ink)}
.src{font-size:.85rem;margin-top:.85rem!important;color:var(--muted)!important}
.steps{counter-reset:s}
.steps li{counter-increment:s;position:relative;padding-top:3.75rem}
.steps li::before{content:counter(s);position:absolute;top:1.35rem;left:1.35rem;width:2rem;height:2rem;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink);font-weight:750;font-size:.9rem}
.ex{font-style:italic;color:var(--ink)!important;border-left:3px solid var(--accent);padding-left:.75rem}
/* Chat mockup */
.chat{margin:0;background:var(--raised);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 18px 40px -24px rgb(0 0 0/.3)}
.chat-head{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.25rem 1rem;padding:.8rem 1.1rem;border-bottom:1px solid var(--line);font-size:.85rem;color:var(--muted);background:var(--surface)}
.chat-head b{color:var(--ink)}
.msgs{list-style:none;margin:0;padding:1.1rem;display:grid;gap:1rem}
.msg{max-width:min(30rem,94%)}
.msg.ours{justify-self:end}
.who{font-size:.78rem;font-weight:650;color:var(--muted);margin:0 0 .3rem}
.bubble{padding:.75rem .95rem;border-radius:14px;background:var(--surface);border:1px solid var(--line)}
.ours .bubble{background:var(--accent-soft);border-color:transparent}
.bubble p{margin:0}.bubble p+p{margin-top:.5rem}
.note{font-size:.78rem;color:var(--muted);margin:.35rem 0 0}
.handoff{display:inline-block;margin-top:.6rem;padding:.45rem .8rem;border-radius:9px;background:var(--accent);color:var(--accent-ink);font-weight:650;font-size:.92rem}
.chat figcaption{padding:.8rem 1.1rem;border-top:1px solid var(--line);font-size:.85rem;color:var(--muted)}
.points{list-style:none;padding:0;margin:1.5rem 0 0;display:grid;gap:.8rem}
.points li{padding-left:1.9rem;position:relative}
.points li::before{content:"";position:absolute;left:.15rem;top:.45rem;width:.9rem;height:.5rem;border-left:2.5px solid var(--accent);border-bottom:2.5px solid var(--accent);transform:rotate(-45deg)}
/* Timeline */
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--line);display:grid;gap:1.4rem}
.timeline li{position:relative;padding-left:1.5rem}
.timeline li::before{content:"";position:absolute;left:-.45rem;top:.45rem;width:.8rem;height:.8rem;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--bg)}
.alt .timeline li::before{box-shadow:0 0 0 4px var(--surface)}
.timeline time{display:block;font-size:.85rem;font-weight:700;color:var(--accent)}
.timeline p{margin:0}
.callout{border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--raised);border-radius:12px;padding:1rem 1.2rem;margin-top:2rem;max-width:44rem}
.callout p{margin:0}
/* Promise */
.checks{list-style:none;padding:0;margin:0}
.checks li{padding:.55rem 0 .55rem 2rem;position:relative;border-bottom:1px solid var(--line)}
.checks li:last-child{border-bottom:0}
.checks li::before{position:absolute;left:.2rem;font-weight:800}
.checks .yes::before{content:"\2713";color:var(--ok)}
.checks .no::before{content:"\2715";color:var(--bad)}
/* Pricing */
.price .card{display:flex;flex-direction:column;gap:.25rem}
.price .card .btn{margin-top:auto;align-self:flex-start}
.price .card ul{margin:.75rem 0 1.5rem;padding-left:1.1rem;color:var(--muted)}
.price .feat{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.amount{font-size:1.8rem;font-weight:800;letter-spacing:-.02em;color:var(--ink)!important}
/* FAQ */
.qa{display:grid;gap:1.25rem;margin:2.5rem 0 0;max-width:48rem}.qa dt{font-size:clamp(1.15rem,2.4vw,1.4rem);font-weight:700;letter-spacing:-.01em}.qa dd{margin:.3rem 0 0;font-size:1.1rem;color:var(--muted)}
.faq{max-width:48rem}
details{border-bottom:1px solid var(--line)}
details:first-child{border-top:1px solid var(--line)}
summary{cursor:pointer;font-weight:650;padding:1.05rem 2rem 1.05rem 0;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:.25rem;top:.85rem;font-size:1.4rem;font-weight:400;color:var(--accent)}
details[open] summary::after{content:"\2212"}
details p{margin:0 0 1.1rem;color:var(--muted)}
/* CTA band */
.band{background:var(--accent);color:var(--accent-ink);border-radius:20px;padding:clamp(2rem,5vw,3.5rem);display:grid;gap:1.5rem}
@media (min-width:52rem){.band{grid-template-columns:1fr auto;align-items:center}}
.band h2{max-width:22ch}.band p{margin:.75rem 0 0;opacity:.92}
.band .btn-primary{background:var(--accent-ink);color:var(--accent)}
.band .btn-ghost{background:transparent;color:var(--accent-ink);border-color:currentColor}
.band a:focus-visible{outline-color:var(--accent-ink)}
/* Code */
.code{margin:0;background:var(--code-bg);color:var(--code-ink);border-radius:14px;overflow:hidden;border:1px solid var(--line);min-width:0}
.code figcaption{font:600 .78rem ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--code-muted);padding:.65rem 1rem;border-bottom:1px solid rgb(255 255 255/.08)}
.code pre{margin:0;padding:1rem;overflow-x:auto;font-size:.84rem;line-height:1.55}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
:not(pre)>code{font-size:.88em;background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:.05rem .3rem;overflow-wrap:anywhere}
.stack{display:grid;gap:1rem;min-width:0}
.status{list-style:none;padding:0;margin:0;display:grid;gap:0;border:1px solid var(--line);border-radius:14px;background:var(--raised);overflow:hidden}
.status li{padding:.9rem 1.1rem;border-bottom:1px solid var(--line)}
.status li:last-child{border-bottom:0}
.status strong{display:inline}.status p{margin:.25rem 0 0;color:var(--muted);font-size:.95rem}
/* Docs pages */
.doc{max-width:46rem;padding-bottom:2rem}.doc h1{font-size:clamp(1.8rem,5vw,2.4rem);margin:2.5rem 0 .75rem}.doc h2{font-size:1.25rem;margin:2rem 0 .5rem;max-width:none}
.draft{background:var(--surface);border-left:4px solid var(--accent);padding:.5rem .9rem}
.doc pre{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:.75rem 1rem;overflow-x:auto}
/* Footer */
.foot{margin-top:clamp(3rem,8vw,5rem);border-top:1px solid var(--line);padding:2rem 0 2.5rem;font-size:.95rem;color:var(--muted)}
.foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem}
.dots{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.35rem 0}
.dots li+li::before{content:"\00b7";margin:0 .6rem;color:var(--muted)}
.dots a{color:var(--ink)}
.gap-top{margin-top:2rem}
.kit{list-style:none;padding:0;margin:1rem 0;display:grid;gap:1rem}.kit h3 code{font-size:.85rem;font-weight:500}.kit details{margin-top:.75rem}.kit pre{max-height:24rem;overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:.75rem 1rem;font-size:.8rem}
.kit-ends{display:grid;gap:.25rem;margin:0}.kit-ends dt{font-weight:650}.kit-ends dd{margin:0 0 .5rem;min-width:0;overflow-wrap:anywhere}