/* Banter AI Studio engineering blog, On Air look. Shared by engineering.html and blog.html. */
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@font-face{font-family:"Geist Mono";src:url(fonts/geist-mono.woff2) format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"Instrument Serif";font-style:italic;src:url(fonts/instrument-serif-italic.woff2) format("woff2");font-display:swap}
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  --sans:Geist,system-ui,sans-serif;--mono:"Geist Mono",ui-monospace,monospace;--serif:"Instrument Serif",Georgia,serif}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg);scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.45;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:1312px;margin:0 auto;padding:0 64px}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase}
.ico{display:inline-block;width:.8em;height:.8em;vertical-align:-.05em;margin-left:.3em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:2px solid var(--ember);outline-offset:3px;border-radius:4px}

/* nav */
nav{position:sticky;top:0;z-index:30;background:rgba(7,6,5,.78);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
nav .row{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1440px;margin:0 auto;padding:0 40px}
.mark{display:flex;align-items:center;gap:.6rem;font-weight:600;font-size:15px;letter-spacing:-.01em}
.mark .logo{width:20px;height:20px;display:block;flex:none}
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.nav-link{font-size:14px;font-weight:500;color:var(--mute);transition:color .2s}
.nav-link:hover,.nav-link.on{color:var(--ink)}
.nav-cta{color:#140804;background:var(--ink);border-radius:999px;padding:9px 18px}
.nav-cta:hover{background:var(--ember);color:#140804}

/* page header */
.top{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.top .wrap{display:grid;grid-template-columns:1fr 460px;gap:48px;align-items:center;min-height:560px;padding-top:40px;padding-bottom:40px}
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.top h1{margin-top:26px;font-size:104px;font-weight:600;letter-spacing:-.055em;line-height:.96;max-width:9.5ch}
.top p{margin-top:30px;font-size:22px;line-height:1.5;color:var(--mute);max-width:44ch}
.top canvas{width:460px;height:460px;display:block}
.top::after{content:"";position:absolute;inset:auto 0 0 0;height:120px;background:linear-gradient(transparent,var(--bg));pointer-events:none}

/* index: post list */
.list{padding:40px 0 140px}
.post{position:relative;display:grid;grid-template-columns:96px 1fr 240px 40px;gap:32px;align-items:start;padding:44px 0;border-bottom:1px solid var(--line);transition:background .3s}
.post .n{font-family:var(--mono);font-size:13px;letter-spacing:.14em;color:var(--dim);padding-top:12px}
.post h2{font-size:40px;font-weight:600;letter-spacing:-.04em;line-height:1.05;transition:color .25s;text-wrap:balance}
.post p{margin-top:14px;font-size:18px;line-height:1.6;color:var(--mute);max-width:60ch}
.post .meta{padding-top:12px;display:flex;flex-direction:column;gap:8px}
.post .meta .tag{color:var(--ember)}
.post .meta .rt{color:var(--dim)}
.post .go{margin-top:8px;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;transition:all .25s}
.post .go svg{width:14px;height:14px}
.post:hover h2{color:var(--ember)}
.post:hover .go{background:var(--ember);border-color:var(--ember);color:#140804;transform:translateX(4px)}
.post.feat{grid-template-columns:96px 1fr 40px;padding:64px 0 60px;border-top:1px solid var(--line)}
.post.feat h2{font-size:64px;max-width:16ch}
.post.feat p{font-size:21px}
.post.feat .meta{flex-direction:row;gap:24px;padding:0;margin-top:26px}

/* article page */
.read{display:grid;grid-template-columns:260px 1fr;gap:96px;padding:96px 0 40px}
.toc{position:sticky;top:110px;align-self:start;display:flex;flex-direction:column;gap:2px}
.toc .mono{color:var(--dim);margin-bottom:14px}
.toc a{display:grid;grid-template-columns:28px 1fr;gap:6px;padding:8px 0;font-size:14px;line-height:1.35;color:var(--dim);transition:color .2s;border-left:2px solid transparent;padding-left:14px;margin-left:-16px}
.toc a span:first-child{font-family:var(--mono);font-size:11px;padding-top:2px}
.toc a:hover{color:var(--ink)}
.toc a.on{color:var(--ink);border-left-color:var(--ember)}
.toc a.on span:first-child{color:var(--ember)}
article{max-width:720px;padding-bottom:110px;margin-bottom:110px;border-bottom:1px solid var(--line);scroll-margin-top:100px}
article:last-of-type{border-bottom:0;margin-bottom:0}
article .kick{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--mute)}
article .kick .tag{color:var(--ember)}
article h2{margin-top:22px;font-size:58px;font-weight:600;letter-spacing:-.045em;line-height:1.02;text-wrap:balance}
article .dek{margin-top:24px;font-size:24px;line-height:1.45;color:var(--ink);letter-spacing:-.01em}
article .body{margin-top:40px;display:flex;flex-direction:column;gap:24px}
article .body p{font-size:19px;line-height:1.72;color:var(--body)}
article .body p a{color:var(--ink);border-bottom:1px solid rgba(255,90,42,.6)}
article .body p a:hover{border-bottom-color:var(--ember)}
article .body code{font-family:var(--mono);font-size:.86em;background:rgba(246,241,234,.07);padding:2px 6px;border-radius:5px}
article .body h3{margin-top:24px;font-size:28px;font-weight:600;letter-spacing:-.03em;line-height:1.2;color:var(--ink)}
article .body ul{display:flex;flex-direction:column;gap:12px;padding-left:0;list-style:none}
article .body li{position:relative;padding-left:26px;font-size:18px;line-height:1.65;color:var(--body)}
article .body li::before{content:"";position:absolute;left:4px;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--ember)}
.lead-in{color:var(--ink);font-weight:500;background:linear-gradient(transparent 68%,rgba(255,90,42,.32) 68%)}
.pull{margin:20px 0;padding:6px 0 6px 28px;border-left:2px solid var(--ember);font-size:30px;line-height:1.3;letter-spacing:-.025em;color:var(--ink);font-weight:500}
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.stat b{font-size:72px;font-weight:600;letter-spacing:-.06em;line-height:.9;color:var(--ember);white-space:nowrap}
.stat span{font-size:17px;line-height:1.5;color:var(--body)}
.sources{margin-top:48px;padding-top:22px;border-top:1px solid var(--line)}
.sources .mono{color:var(--dim)}
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.sources a{border-bottom:1px solid var(--line)}
.sources a:hover{color:var(--ink);border-bottom-color:var(--ember)}
.back{display:inline-flex;align-items:center;gap:8px;margin-top:40px;color:var(--mute)}
.back:hover{color:var(--ink)}

/* closing band + footer */
.contact{position:relative;overflow:hidden;padding:150px 0 140px;text-align:center;background:radial-gradient(70% 90% at 50% 100%,#ff5a2a 0%,#c8321a 30%,#5a1408 62%,var(--bg) 100%)}
.contact .mono{color:#ffd9c9}
.contact h2{font-size:140px;font-weight:600;letter-spacing:-.065em;line-height:.9;margin-top:24px}
.contact p{margin:30px auto 0;color:#ffe6dc;font-size:21px;max-width:44ch;line-height:1.5}
.cta-row{margin-top:44px;display:flex;gap:28px;align-items:center;justify-content:center;flex-wrap:wrap}
.book{background:var(--ink);color:#140804;padding:18px 32px;border-radius:999px;font-size:17px;font-weight:600;display:inline-flex;align-items:center;transition:transform .2s;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.book:hover{transform:translateY(-2px)}
.email{font-size:17px;border-bottom:1px solid rgba(255,230,220,.6);padding-bottom:3px;color:#fff}
footer{background:var(--bg);color:var(--mute);padding:30px 0}
footer .row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase}
footer a:hover{color:var(--ink)}

@media(max-width:1100px){.read{grid-template-columns:1fr;gap:0}.toc{display:none}.post{grid-template-columns:64px 1fr 40px}.post .meta{grid-column:2;grid-row:2;flex-direction:row;gap:18px;padding:0}.post.feat .meta{grid-row:auto}}
@media(max-width:900px){
 .wrap{padding:0 20px}
 nav .row{padding:0 20px;height:60px}
 .nav-right{gap:16px}.nav-link.hide-sm{display:none}
 .top .wrap{grid-template-columns:1fr;min-height:0;gap:0;padding-top:48px;padding-bottom:56px}
 .top canvas{width:260px;height:260px;margin:0 auto;order:-1}
 .top h1{font-size:56px;margin-top:18px}
 .top p{font-size:18px;margin-top:20px}
 .list{padding:12px 0 88px}
 .post,.post.feat{grid-template-columns:1fr;gap:12px;padding:36px 0}
 .post .n{padding:0}
 .post h2,.post.feat h2{font-size:30px}
 .post p,.post.feat p{font-size:16px;margin-top:8px}
 .post .meta,.post.feat .meta{grid-column:auto;grid-row:auto;margin-top:6px}
 .post .go{display:none}
 .read{padding:56px 0 20px}
 article{padding-bottom:72px;margin-bottom:72px}
 article h2{font-size:36px}
 article .dek{font-size:19px;margin-top:16px}
 article .body{margin-top:28px;gap:20px}
 article .body p{font-size:17px}
 article .body h3{font-size:22px;margin-top:12px}
 .pull{font-size:22px;padding-left:18px}
 .stat{grid-template-columns:1fr;gap:10px;padding:22px}
 .stat b{font-size:52px}
 .contact{padding:100px 0 96px}
 .contact h2{font-size:64px}
 .contact p{font-size:17px}
}
.fig{margin:20px 0 12px;padding:28px 28px 20px;border:1px solid var(--line);border-radius:18px;background:var(--bg2)}
.fig svg{display:block;overflow:visible}
.fig figcaption{margin-top:16px;font-size:14px;line-height:1.5;color:var(--mute)}
@media(max-width:900px){.fig{padding:18px 14px 14px;margin:8px 0}.fig figcaption{font-size:13px}}