:root{
      --bg:#070908;--surface:#0c0f0d;--ink:#f1f2ed;--muted:#8f9891;
      --line:#222824;--green:#21ef91;--green-soft:#9dffc9;--max:1480px;
    }
    *{box-sizing:border-box;margin:0;padding:0}
    html,body{min-height:100%;background:var(--bg);color:var(--ink)}
    body{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
    button,input{font:inherit}
    button{color:inherit}
    .shell{min-height:100svh;position:relative;isolation:isolate}
    .shell:before{content:"";position:fixed;inset:0;z-index:-2;background:radial-gradient(circle at 73% 46%,rgba(33,239,145,.075),transparent 31%),linear-gradient(rgba(255,255,255,.024) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.024) 1px,transparent 1px);background-size:auto,64px 64px,64px 64px;mask-image:linear-gradient(to right,transparent 3%,#000 50%,transparent 100%)}
    .shell:after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(90deg,var(--bg) 0%,transparent 22%,transparent 78%,var(--bg) 100%)}
    header{height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(24px,4.4vw,72px)}
    .brand{display:flex;align-items:center;gap:14px}
    .brand img{width:26px;height:26px;object-fit:contain}
    .brand-copy{display:grid;gap:3px}
    .brand-name{font-size:12px;letter-spacing:.18em;text-transform:uppercase;font-weight:700}
    .brand-sub{font:10px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);letter-spacing:.12em;text-transform:uppercase}
    .status{display:flex;align-items:center;gap:10px;font:10px/1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.14em;color:#bdc5bf;text-transform:uppercase}
    .status i{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 16px rgba(33,239,145,.75);animation:pulse 2.6s infinite}
    main{max-width:var(--max);margin:auto;min-height:calc(100svh - 88px);padding:clamp(52px,8vh,96px) clamp(24px,4.4vw,72px) 32px;display:grid;grid-template-rows:1fr auto}
    .hero{display:grid;grid-template-columns:minmax(0,1.22fr) minmax(320px,.78fr);gap:clamp(48px,8vw,132px);align-items:center}
    .eyebrow{display:flex;align-items:center;gap:14px;color:var(--green);font:11px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.18em;margin-bottom:28px}
    .eyebrow:before{content:"";width:34px;height:1px;background:var(--green)}
    h1{font-size:clamp(46px,6vw,92px);line-height:.96;letter-spacing:-.058em;max-width:930px;font-weight:520}
    h1 em{display:block;color:var(--green);font-style:normal}
    .intro{margin-top:30px;max-width:720px;font-size:clamp(16px,1.35vw,21px);line-height:1.58;color:#b7beb8;font-weight:350}
    .intro strong{color:var(--ink);font-weight:520}
    .actions{display:flex;align-items:center;gap:22px;margin-top:38px;flex-wrap:wrap}
    .primary{border:1px solid var(--green);background:var(--green);color:#041109;padding:15px 21px;display:inline-flex;align-items:center;gap:28px;cursor:pointer;font:700 11px/1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.12em;text-transform:uppercase;transition:.25s ease}
    .primary:hover{background:var(--green-soft);border-color:var(--green-soft);transform:translateY(-2px)}
    .primary span{font-size:17px;line-height:0}
    .micro{font:10px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:#727b74;letter-spacing:.05em;max-width:275px}
    .intelligence{position:relative;min-height:420px;border-left:1px solid var(--line);padding-left:clamp(30px,5vw,74px);display:flex;align-items:center}
    .orbit{position:absolute;width:370px;height:370px;right:-68px;top:50%;transform:translateY(-50%);opacity:.78}
    .ring{position:absolute;inset:0;border:1px solid rgba(33,239,145,.18);border-radius:50%}
    .ring.r2{inset:54px;border-color:rgba(255,255,255,.1);animation:spin 18s linear infinite}
    .ring.r2:after,.ring.r2:before{content:"";position:absolute;width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 18px rgba(33,239,145,.8)}
    .ring.r2:before{left:16px;top:43px}.ring.r2:after{right:5px;bottom:66px}
    .cross{position:absolute;left:50%;top:50%;width:120%;height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);transform:translate(-50%,-50%) rotate(-28deg)}
    .core{position:absolute;left:50%;top:50%;width:74px;height:74px;border:1px solid var(--green);transform:translate(-50%,-50%) rotate(45deg);box-shadow:inset 0 0 35px rgba(33,239,145,.06)}
    .core:after{content:"SIA";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) rotate(-45deg);font:11px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.2em;color:var(--green)}
    .side-copy{position:relative;z-index:2;max-width:330px}
    .side-label{font:10px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--green);letter-spacing:.17em;text-transform:uppercase;margin-bottom:20px}
    .tagline{font-size:clamp(25px,2.5vw,42px);line-height:1.08;letter-spacing:-.04em;font-weight:450}
    .tagline span{display:block;color:#79827b}
    .powered{margin-top:30px;padding-top:18px;border-top:1px solid var(--line);font:10px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:#78817a;text-transform:uppercase;letter-spacing:.14em}
    .powered strong{color:#d5dad5;font-weight:500}
    .bottom{border-top:1px solid var(--line);margin-top:48px;padding:18px 0 4px;display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}
    .topics{display:flex;flex-wrap:wrap;gap:8px 22px;font:10px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:#69716b;text-transform:uppercase;letter-spacing:.08em}
    .topics b{color:#a9b1aa;font-weight:500}
    .privacy{font:10px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:#69716b;text-align:right;max-width:440px}

    .chat{display:none;max-width:1120px;margin:0 auto;min-height:calc(100svh - 88px);padding:54px 24px 28px;grid-template-rows:auto 1fr auto;gap:26px}
    .chat.active{display:grid}.landing.hidden{display:none}
    .chat-head{display:flex;justify-content:space-between;gap:20px;align-items:end;border-bottom:1px solid var(--line);padding-bottom:22px}
    .chat-head h2{font-size:clamp(28px,3vw,42px);font-weight:450;letter-spacing:-.04em}
    .chat-head p{font:10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);text-transform:uppercase;letter-spacing:.12em;margin-top:8px}
    .reset{background:transparent;border:0;color:#747c76;cursor:pointer;font:10px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.12em;padding:8px}.reset:hover{color:var(--green)}
    .messages{display:flex;flex-direction:column;justify-content:flex-end;gap:18px;padding:20px 0;min-height:360px}
    .message{max-width:760px;padding-left:18px;border-left:1px solid var(--line);color:#bec5bf;font-size:16px;line-height:1.65}
    .message.sia{border-color:var(--green)}
    .who{font:10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--green);text-transform:uppercase;letter-spacing:.14em;margin-bottom:8px}
    .suggestions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
    .suggestions button{background:transparent;border:1px solid var(--line);padding:9px 11px;color:#8d968f;cursor:pointer;font-size:12px}.suggestions button:hover{border-color:#536058;color:var(--ink)}
    .composer{border-top:1px solid var(--line);padding-top:18px;display:grid;grid-template-columns:1fr auto;gap:14px}
    .composer input{background:transparent;border:0;outline:0;color:var(--ink);font-size:17px;padding:12px 0}.composer input::placeholder{color:#59615b}
    .send{width:48px;height:48px;border:1px solid var(--green);background:transparent;color:var(--green);cursor:pointer;font-size:20px}.send:hover{background:var(--green);color:#041109}
    .chat-note{grid-column:1/-1;color:#5f6761;font:9px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em}
    @keyframes spin{to{transform:rotate(360deg)}}
    @keyframes pulse{50%{opacity:.35}}
    @media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
    @media(max-width:920px){header{height:74px}.hero{grid-template-columns:1fr}.intelligence{min-height:235px;border-left:0;border-top:1px solid var(--line);padding:38px 0}.orbit{width:250px;height:250px;right:-70px}.side-copy{max-width:520px}.bottom{grid-template-columns:1fr}.privacy{text-align:left}.brand-sub{display:none}main{min-height:calc(100svh - 74px);padding-top:52px}.chat{min-height:calc(100svh - 74px)}}
    @media(max-width:560px){header{padding:0 20px}.status{font-size:9px}.brand-name{font-size:10px}main{padding:38px 20px 24px}h1{font-size:43px}.intro{font-size:16px}.intelligence{overflow:hidden}.tagline{font-size:30px}.bottom{margin-top:28px}.privacy{font-size:9px}.composer input{font-size:15px}.chat-head{align-items:start}.orbit{opacity:.48}}
  
/* Viewport-fit: shrink spacing, not content; long conversations scroll inside their log. */
:root{--header-height:72px}
header{height:var(--header-height)}
.shell{min-height:100dvh}
main.landing{min-height:calc(100dvh - var(--header-height));padding-top:clamp(24px,4dvh,56px);padding-bottom:20px;grid-template-rows:1fr auto}
h1{font-size:clamp(44px,min(5.8vw,9.7dvh),88px)}
.eyebrow{margin-bottom:20px}.intro{margin-top:24px;font-size:clamp(16px,1.3vw,20px);line-height:1.5}.actions{margin-top:26px}.bottom{margin-top:24px;padding-top:14px}
.intelligence{min-height:340px}
.chat{height:calc(100dvh - var(--header-height));min-height:0;padding:24px 24px 18px;grid-template-rows:auto minmax(0,1fr) auto auto;gap:16px}
.chat .messages{min-height:0;max-height:none;overflow-y:auto;padding:12px 0}
.chat .suggestions{margin-top:0}.chat-head{padding-bottom:16px}.composer{padding-top:12px;gap:10px}
@media(max-width:920px){
 :root{--header-height:64px}
 main.landing{padding:24px 24px 16px}.hero{gap:24px}
 h1{font-size:clamp(34px,min(6vw,6.2dvh),52px)}
 .eyebrow{margin-bottom:14px}.intro{margin-top:16px;font-size:16px;line-height:1.45}.actions{margin-top:18px}
 .intelligence{min-height:0;padding:20px 0}.side-copy{max-width:none}.side-label{margin-bottom:10px}
 .tagline{font-size:26px}.tagline span{display:inline;margin:0 .2em}.powered{margin-top:12px;padding-top:10px}
 .orbit{width:170px;height:170px;right:0;opacity:.35}
 .bottom{gap:12px;margin-top:16px}.footer-brand{margin-top:6px}
}
@media(max-width:560px){
 main.landing{padding:18px 20px 14px}.hero{gap:16px}
 h1{font-size:clamp(30px,8vw,38px)}.eyebrow{font-size:9px;letter-spacing:.10em;gap:8px;margin-bottom:12px}.eyebrow:before{width:20px;flex-shrink:0}
 .intro{font-size:14px;line-height:1.45;margin-top:14px}.actions{gap:10px;margin-top:16px}.primary{padding:13px 16px;font-size:10px}.micro{font-size:9px;max-width:none;line-height:1.4}
 .intelligence{padding:14px 0}.side-label{font-size:9px;margin-bottom:8px}.tagline{font-size:20px;line-height:1.15}.powered{margin-top:9px;padding-top:8px;font-size:9px}
 .bottom{margin-top:10px;padding-top:10px;gap:8px}.topics{font-size:9px;gap:5px 12px}.privacy{font-size:9px;line-height:1.4}.footer-brand{font-size:9px}
 .chat{padding:18px 20px 14px;gap:12px}.chat-head{gap:12px}.chat-head h2{font-size:28px}.chat-head p{font-size:9px;line-height:1.4}.reset{font-size:9px;padding:6px}.message{font-size:15px}.suggestions button{font-size:11px;padding:8px}.composer textarea{font:16px/1.5 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}
}
@media(max-width:560px) and (max-height:740px){
 :root{--header-height:56px}main.landing{padding-top:14px;padding-bottom:10px}.hero{gap:12px}h1{font-size:30px}.intro{font-size:13px;margin-top:12px;line-height:1.4}.eyebrow{margin-bottom:10px}.actions{margin-top:12px}.intelligence{padding:10px 0}.side-label{margin-bottom:6px}.tagline{font-size:18px}.powered{margin-top:6px;padding-top:6px}.bottom{margin-top:8px}.orbit{width:120px;height:120px}
}
@media(min-width:921px) and (max-height:720px){
 :root{--header-height:64px}main.landing{padding-top:20px;padding-bottom:14px}h1{font-size:clamp(42px,min(5.5vw,8.8dvh),66px)}.eyebrow{margin-bottom:14px}.intro{margin-top:18px;font-size:16px;line-height:1.4}.actions{margin-top:18px}.bottom{margin-top:16px}.intelligence{min-height:280px}.orbit{width:280px;height:280px}.chat{padding-top:18px}
}
html{overflow-x:clip}.shell{overflow-x:clip}.header-tools{display:flex;align-items:center;gap:32px}.languages{display:flex;gap:13px}.languages a{font:10px ui-monospace,monospace;color:#8f9891;text-decoration:none;padding:8px 0}.languages a[aria-current]{color:var(--green)}a:focus-visible,button:focus-visible,textarea:focus-visible{outline:2px solid var(--green);outline-offset:5px}.composer textarea{width:100%;min-width:0;resize:none;background:transparent;border:0;outline:0;color:var(--ink);font:17px/1.6 inherit;padding:12px 0}.composer textarea::placeholder{color:#8f9891}.bubble{white-space:pre-wrap;overflow-wrap:anywhere}.message.agent{border-color:var(--green)}.tag{display:block;font:10px ui-monospace,monospace;color:var(--green);margin-bottom:8px}.messages{max-height:55vh;overflow-y:auto;justify-content:start}.suggestions[hidden]{display:none}.chat-actions{display:flex;gap:10px}.footer-brand{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:9px;color:#8f9891}.footer-brand img{width:16px;height:16px}.brand-sub{letter-spacing:.03em}.privacy,.topics,.micro,.chat-note{color:#969f98}.chat-note a{color:inherit}.send:disabled{opacity:.45;cursor:wait}.brand-name a{color:inherit;text-decoration:none}@media(max-width:560px){.header-tools{gap:14px}.status{display:none}.languages{gap:10px}.brand{gap:9px}.brand-name{letter-spacing:.08em}.chat-head{flex-direction:column}.chat-actions{flex-wrap:wrap}.composer textarea{font-size:16px}}