/* Viaduct site. Light-first, cool neutrals, cobalt brand, copper as a rare second accent.
   Type: Geist for everything, Geist Mono for commands and data. */
:root{
  --bg:#ffffff; --bg-subtle:#f6f7fa; --bg-panel:#eef0f6; --fg:#0a0d17; --fg-2:#3b4152; --muted:#6a7183;
  --border:#e6e8ef; --border-strong:#d5d9e4;
  --brand:#3a4cf5; --brand-2:#2531d1; --brand-ink:#ffffff; --brand-soft:#eceffe;
  --copper:#e8743a; --claude:#d97757; --claude-ink:#ffffff; --ok:#0f9d63;
  --term-bg:#0b0e19; --term-fg:#e7e9f2; --term-dim:#7d8499;
  --sans:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --radius:12px; --max:1160px; --bar-h:60px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#07090f; --bg-subtle:#0d1019; --bg-panel:#121624; --fg:#eef0f7; --fg-2:#c3c8d6; --muted:#8a91a6;
  --border:#1b2030; --border-strong:#283047;
  --brand:#7b88ff; --brand-2:#5d6cff; --brand-ink:#07090f; --brand-soft:#151a33;
  --copper:#ff9a5e; --claude:#e08a6b; --claude-ink:#140c08; --ok:#3fd394;
  --term-bg:#0d1019; --term-fg:#e7e9f2; --term-dim:#7d8499; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#07090f; --bg-subtle:#0d1019; --bg-panel:#121624; --fg:#eef0f7; --fg-2:#c3c8d6; --muted:#8a91a6;
  --border:#1b2030; --border-strong:#283047;
  --brand:#7b88ff; --brand-2:#5d6cff; --brand-ink:#07090f; --brand-soft:#151a33;
  --copper:#ff9a5e; --claude:#e08a6b; --claude-ink:#140c08; --ok:#3fd394;
  --term-bg:#0d1019; --term-fg:#e7e9f2; --term-dim:#7d8499; color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--bar-h) + 16px)}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
h1,h2,h3,h4,p{margin:0}
.gutter{padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.container{max-width:var(--max);margin:0 auto}
.mono{font-family:var(--mono)}
.icon{width:16px;height:16px;flex:none;fill:currentColor}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:saturate(1.6) blur(14px);-webkit-backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--border)}
.topbar .container{height:var(--bar-h);display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:9px;font-weight:600;font-size:16px;letter-spacing:-.02em;text-decoration:none}
.logo img{width:26px;height:26px}
.nav{display:flex;gap:4px;font-size:14px}
.nav a{text-decoration:none;color:var(--fg-2);padding:6px 10px;border-radius:8px}
.nav a:hover,.nav a[aria-current="page"]{color:var(--fg);background:var(--bg-subtle)}
.bar-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.gh-link{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--fg-2);text-decoration:none;padding:6px 10px;border-radius:8px}
.gh-link:hover{color:var(--fg);background:var(--bg-subtle)}
.gh-link .count{font-family:var(--mono);font-size:12px;color:var(--muted);border-left:1px solid var(--border);padding-left:8px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;height:40px;padding:0 16px;border-radius:10px;
  font:500 14px/1 var(--sans);text-decoration:none;border:1px solid transparent;cursor:pointer;white-space:nowrap}
.btn .short{display:none}
.btn-sm{height:34px;padding:0 12px;font-size:13px;border-radius:9px}
.btn-claude{background:var(--claude);color:var(--claude-ink)}
.btn-claude:hover{filter:brightness(1.06)}
.btn-dark{background:var(--fg);color:var(--bg)}
.btn-dark:hover{opacity:.9}
.btn-ghost{border-color:var(--border-strong);color:var(--fg);background:var(--bg)}
.btn-ghost:hover{background:var(--bg-subtle)}

/* ---------- hero ---------- */
.hero{padding-block:88px 40px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-20% -10% auto auto;width:70%;height:120%;pointer-events:none;
  background:radial-gradient(closest-side,color-mix(in srgb,var(--brand) 16%,transparent),transparent),
             radial-gradient(closest-side at 70% 60%,color-mix(in srgb,var(--copper) 10%,transparent),transparent)}
.hero .container{position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--fg-2);text-decoration:none;
  border:1px solid var(--border);background:var(--bg);border-radius:999px;padding:4px 12px 4px 4px}
.eyebrow b{background:var(--brand-soft);color:var(--brand);font-weight:600;font-size:12px;border-radius:999px;padding:2px 9px}
.eyebrow:hover{border-color:var(--border-strong)}
.hero h1{font-size:clamp(2.6rem,6.4vw,4.6rem);line-height:1.0;letter-spacing:-.04em;font-weight:600;margin-top:22px;max-width:14ch}
.hero h1 span{color:var(--muted)}
.hero .sub{font-size:clamp(1.05rem,1.6vw,1.25rem);color:var(--fg-2);max-width:36em;margin-top:22px;line-height:1.5}
.hero .actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:32px}
.works-with{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:40px;font-size:13px;color:var(--muted)}
.works-with span{display:inline-flex;align-items:center;gap:7px;color:var(--fg-2)}

/* terminal */
.term{background:var(--term-bg);color:var(--term-fg);border-radius:14px;border:1px solid color-mix(in srgb,var(--term-fg) 10%,transparent);
  box-shadow:0 30px 80px -40px rgba(20,30,90,.55);overflow:hidden}
.term-bar{display:flex;align-items:center;gap:7px;padding:12px 14px;border-bottom:1px solid rgba(255,255,255,.06)}
.term-bar i{width:11px;height:11px;border-radius:50%;background:#2b3042}
.term-bar span{margin-left:10px;font:12px var(--mono);color:var(--term-dim)}
.term pre{margin:0;padding:18px 20px 22px;font:13px/1.7 var(--mono);overflow-x:auto;white-space:pre}
.term .c{color:var(--term-dim)} .term .p{color:#ff9a5e} .term .g{color:#46d69a} .term .b{color:#9aa6ff}

.hero-demo{margin-top:56px;display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:stretch}
.hero-demo > *{min-width:0}
.hero-shot{border-radius:14px;border:1px solid var(--border);background:linear-gradient(160deg,var(--bg-subtle),var(--bg-panel));
  display:flex;flex-direction:column;justify-content:center;padding:20px;position:relative}
.hero-shot img{width:100%;height:auto}
.hero-shot .tag{position:absolute;left:16px;bottom:14px;font:12px var(--mono);color:var(--muted)}

/* ---------- sections ---------- */
.section{padding-block:96px}
.section + .section{border-top:1px solid var(--border)}
.kicker{font:500 13px var(--mono);color:var(--brand);letter-spacing:.02em}
.section h2{font-size:clamp(1.8rem,3.4vw,2.6rem);letter-spacing:-.03em;line-height:1.08;font-weight:600;margin-top:12px;max-width:20ch}
.section .lead{color:var(--fg-2);font-size:17px;max-width:38em;margin-top:14px}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}

.film .sec-head{align-items:flex-end}
.film-note{color:var(--muted);font-size:14px;max-width:26em;margin:0}
.film-frame{margin-top:32px;border-radius:18px;overflow:hidden;border:1px solid var(--border);background:#05070d;
  box-shadow:0 40px 100px -50px rgba(20,30,120,.55);aspect-ratio:16/9}
.film-frame video{display:block;width:100%;height:100%;object-fit:cover;background:#05070d}

/* gallery */
.gallery-wrap{margin-top:40px;position:relative}
.gallery{display:flex;gap:18px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-padding-left:max(20px,calc((100vw - var(--max))/2));
  padding-inline:max(20px,calc((100vw - var(--max))/2));padding-bottom:12px;scrollbar-width:none}
.gallery::-webkit-scrollbar{display:none}
.card{flex:0 0 min(520px,82vw);scroll-snap-align:start;border:1px solid var(--border);border-radius:16px;overflow:hidden;background:var(--bg)}
.card .img{aspect-ratio:16/11;background:linear-gradient(160deg,var(--bg-subtle),var(--bg-panel));display:flex;align-items:center;justify-content:center;padding:18px}
.card .img img{max-height:100%;width:auto;object-fit:contain}
.card .img.sch{padding:0;background:#fff}
.card .img.sch img{width:100%;height:100%;object-fit:cover}
.card .meta{padding:16px 18px 18px;display:flex;justify-content:space-between;gap:16px;align-items:flex-start}
.card h3{font-size:15px;font-weight:600}
.card p{font-size:13px;color:var(--muted);margin-top:2px}
.card .stat{text-align:right;font:12px/1.5 var(--mono);color:var(--muted);white-space:nowrap}
.card .stat b{display:block;font:600 13px var(--mono);color:var(--ok)}
.g-ctrl{display:flex;gap:8px}
.g-ctrl button{width:38px;height:38px;border-radius:50%;border:1px solid var(--border-strong);background:var(--bg);color:var(--fg);cursor:pointer;display:grid;place-items:center}
.g-ctrl button:hover{background:var(--bg-subtle)}
.g-ctrl button:disabled{opacity:.35;cursor:default}

/* steps */
.steps{display:grid;grid-template-columns:300px 1fr;gap:64px;margin-top:0}
.steps > *{min-width:0}
.steps .sticky{position:sticky;top:calc(var(--bar-h) + 40px);align-self:start}
.step-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--border)}
.step-list li{display:grid;grid-template-columns:44px 1fr auto;gap:18px;padding:22px 0;border-bottom:1px solid var(--border);align-items:baseline}
.step-list .n{font:500 13px var(--mono);color:var(--muted)}
.step-list h3{font-size:17px;font-weight:600;letter-spacing:-.01em}
.step-list p{color:var(--fg-2);margin-top:4px;max-width:46em}
.step-list .out{font:12px var(--mono);color:var(--muted);white-space:nowrap}

/* numbers */
.numbers{display:grid;grid-template-columns:repeat(4,1fr);margin-top:44px;border:1px solid var(--border);border-radius:16px;overflow:hidden}
.numbers > div{padding:26px 24px;border-right:1px solid var(--border);min-width:0}
.numbers > div:last-child{border-right:0}
.numbers .v{font-size:40px;font-weight:600;letter-spacing:-.035em;font-variant-numeric:tabular-nums;line-height:1}
.numbers .v small{font-size:17px;color:var(--muted);font-weight:500;margin-left:2px}
.numbers .l{font-size:14px;font-weight:500;margin-top:12px}
.numbers .d{font-size:13px;color:var(--muted)}

/* layers feature */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split > *{min-width:0}
.modes{margin-top:28px;display:grid;gap:0;border-top:1px solid var(--border)}
.mode{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--border);align-items:baseline}
.mode code{font:500 13px var(--mono);color:var(--fg)}
.mode code.auto{color:var(--brand)}
.mode p{color:var(--fg-2);font-size:14px}
.stack{border:1px solid var(--border);border-radius:16px;padding:28px;background:var(--bg-subtle)}
.layer{display:grid;grid-template-columns:72px 1fr 120px;gap:14px;align-items:center;font:12px var(--mono);color:var(--muted)}
.layer + .layer{margin-top:10px}
.layer .cu{height:16px;border-radius:3px;background:var(--copper)}
.layer .cu.sig{background:repeating-linear-gradient(90deg,var(--copper) 0 22px,transparent 22px 30px,var(--copper) 30px 38px,transparent 38px 52px)}
.layer .cu.plane{background:var(--copper)}
.layer .cu.pwr{background:color-mix(in srgb,var(--copper) 60%,var(--bg-subtle))}
.layer .fr{height:12px;border-radius:2px;background:var(--border-strong);grid-column:2}
.layer.core{grid-template-columns:72px 1fr 120px}

/* commands */
.cmd-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:40px;border-top:1px solid var(--border)}
.cmd{padding:22px 20px 22px 0;min-width:0}
.cmd + .cmd{padding-left:20px;border-left:1px solid var(--border)}
.cmd code{font:500 14px var(--mono);color:var(--brand)}
.cmd p{color:var(--fg-2);font-size:14px;margin-top:8px}

/* install + changelog */
.install{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
.install > *{min-width:0}
.copy{display:flex;align-items:center;gap:10px;background:var(--term-bg);color:var(--term-fg);border-radius:10px;padding:0 6px 0 14px;height:46px;margin-top:10px}
.copy .pr{color:var(--term-dim);font:13px var(--mono)}
.copy code{flex:1;min-width:0;overflow-x:auto;white-space:nowrap;font:13px var(--mono);scrollbar-width:none}
.copy button{flex:none;height:34px;padding:0 12px;border-radius:7px;border:0;background:rgba(255,255,255,.08);color:var(--term-fg);font:12px var(--sans);cursor:pointer}
.copy button:hover{background:rgba(255,255,255,.14)}
.req{font-size:14px;color:var(--muted);margin-top:16px}
.req a{color:var(--fg-2)}
.log{list-style:none;margin:20px 0 0;padding:0;border-top:1px solid var(--border)}
.log li{display:grid;grid-template-columns:56px 1fr;gap:14px;padding:14px 0;border-bottom:1px solid var(--border)}
.log .ver{font:500 13px var(--mono)}
.log .date{font:12px var(--mono);color:var(--muted)}
.log p{font-size:14px;color:var(--fg-2)}
.more{display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-size:14px;color:var(--brand);text-decoration:none}
.more:hover{text-decoration:underline}

/* cta + footer */
.cta{margin-block:0 96px;border-radius:20px;padding:56px;background:var(--term-bg);color:var(--term-fg);position:relative;overflow:hidden;
  display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.cta::after{content:"";position:absolute;right:-10%;top:-60%;width:60%;height:220%;background:radial-gradient(closest-side,rgba(110,125,255,.35),transparent);pointer-events:none}
.cta h2{font-size:clamp(1.6rem,3vw,2.3rem);letter-spacing:-.03em;font-weight:600;line-height:1.1;max-width:18ch;position:relative}
.cta p{color:#a9afc4;margin-top:10px;position:relative}
.cta .actions{display:flex;gap:10px;flex-wrap:wrap;position:relative}
.cta .btn-ghost{background:transparent;color:var(--term-fg);border-color:rgba(255,255,255,.2)}
.cta .btn-ghost:hover{background:rgba(255,255,255,.06)}
.footer{border-top:1px solid var(--border);padding-block:48px 56px;font-size:14px}
.footer .container{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:32px}
.footer h4{font-size:13px;font-weight:500;color:var(--muted);margin-bottom:12px}
.footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer a{text-decoration:none;color:var(--fg-2)}
.footer a:hover{color:var(--fg)}
.footer .fine{color:var(--muted);font-size:13px;margin-top:12px;max-width:30em}

/* ---------- docs ---------- */
.docs{display:grid;grid-template-columns:232px minmax(0,1fr) 200px;gap:48px;padding-block:40px 96px}
.docs-nav{position:sticky;top:calc(var(--bar-h) + 32px);align-self:start;font-size:14px}
.docs-nav h4{font-size:12px;font-weight:500;color:var(--muted);margin:0 0 8px;font-family:var(--mono);letter-spacing:.03em;text-transform:uppercase}
.docs-nav ul{list-style:none;margin:0 0 24px;padding:0;display:grid;gap:2px}
.docs-nav a{display:block;padding:6px 10px;border-radius:8px;text-decoration:none;color:var(--fg-2)}
.docs-nav a:hover{background:var(--bg-subtle);color:var(--fg)}
.docs-nav a[aria-current="page"]{background:var(--brand-soft);color:var(--brand);font-weight:500}
.toc{position:sticky;top:calc(var(--bar-h) + 32px);align-self:start;font-size:13px}
.toc h4{font-size:12px;font-weight:500;color:var(--muted);margin:0 0 10px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.03em}
.toc ul{list-style:none;margin:0;padding:0 0 0 12px;border-left:1px solid var(--border);display:grid;gap:7px}
.toc a{text-decoration:none;color:var(--muted)}
.toc a:hover{color:var(--fg)}
.prose{max-width:740px;min-width:0}
.prose .crumb{font:13px var(--mono);color:var(--muted);margin-bottom:10px}
.prose h1{font-size:2.3rem;letter-spacing:-.035em;line-height:1.1;font-weight:600;margin-bottom:18px}
.prose h2{font-size:1.45rem;letter-spacing:-.02em;font-weight:600;margin:48px 0 12px;padding-top:8px}
.prose h3{font-size:1.1rem;font-weight:600;margin:32px 0 8px}
.prose p,.prose ul,.prose ol{margin:0 0 16px;color:var(--fg-2)}
.prose li{margin:4px 0}
.prose a{color:var(--brand);text-decoration:none}
.prose a:hover{text-decoration:underline}
.prose code{font:13px var(--mono);background:var(--bg-panel);border-radius:5px;padding:2px 6px;color:var(--fg)}
.prose pre{background:var(--term-bg);color:var(--term-fg);border-radius:12px;padding:16px 18px;overflow-x:auto;margin:0 0 20px}
.prose pre code{background:none;padding:0;color:inherit;font-size:13px;line-height:1.65}
.prose table{border-collapse:collapse;width:100%;font-size:14px;margin:0 0 20px;display:block;overflow-x:auto}
.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}
.prose th{font-weight:500;color:var(--muted);font-size:13px}
.prose blockquote{margin:0 0 16px;padding:4px 16px;border-left:3px solid var(--brand);color:var(--fg-2)}
.prose img{border-radius:12px;border:1px solid var(--border);margin:8px 0 20px}
.prose hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:56px;padding-top:24px;border-top:1px solid var(--border)}
.pager a{display:block;text-decoration:none;border:1px solid var(--border);border-radius:12px;padding:14px 18px;min-width:0;flex:1}
.pager a:hover{border-color:var(--border-strong)}
.pager small{display:block;color:var(--muted);font-size:12px}
.pager span{font-weight:500}
.pager .next{text-align:right}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .docs{grid-template-columns:200px minmax(0,1fr)} .toc{display:none}
}
@media (max-width:900px){
  .nav{display:none}
  .hero{padding-block:56px 24px}
  .hero-demo,.split,.install,.steps{grid-template-columns:1fr;gap:32px}
  .steps .sticky{position:static}
  .numbers{grid-template-columns:1fr 1fr}
  .numbers > div:nth-child(2){border-right:0}
  .numbers > div:nth-child(-n+2){border-bottom:1px solid var(--border)}
  .cmd-grid{grid-template-columns:1fr 1fr}
  .cmd:nth-child(3){padding-left:0;border-left:0}
  .cmd:nth-child(n+3){border-top:1px solid var(--border)}
  .footer .container{grid-template-columns:1fr 1fr}
  .docs{grid-template-columns:1fr;gap:20px}
  .docs-nav{position:static;display:flex;gap:6px;overflow-x:auto}
  .docs-nav h4{display:none}
  .docs-nav ul{display:flex;margin:0;gap:4px}
  .docs-nav a{white-space:nowrap}
  .section{padding-block:64px}
  .cta{padding:36px 28px}
}
@media (max-width:560px){
  .gh-link .label,.gh-link .count{display:none}
  .bar-right .btn-claude .long{display:none}
  .bar-right .btn-claude .short{display:inline}
  .step-list li{grid-template-columns:32px 1fr}
  .step-list .out{grid-column:2}
  .cmd-grid{grid-template-columns:1fr}
  .cmd + .cmd{padding-left:0;border-left:0;border-top:1px solid var(--border)}
  .layer{grid-template-columns:56px 1fr}
  .layer em{display:none}
}
@media (prefers-reduced-motion:no-preference){
  .gallery{scroll-behavior:smooth}
  .btn,.nav a,.card{transition:background-color .15s,border-color .15s,filter .15s,opacity .15s}
}