/* Darren Labs v3. One language: ink, paper, amber. Cards everywhere, no hairline rows, no mono labels on every heading. */
:root{
  --bg:#0E1013; --surface:#181C22; --surface2:#14171C; --panel:#0B0D10;
  --text:#F2EFE9; --text2:#D9D6CE; --muted:#A8A59C; --faint:#8A877E;
  --line:#262B33; --line2:#3A414A; --accent:#FFB224; --accent-ink:#16100A;
  --radius:16px; --max:1120px; --narrow:720px;
  --display:"Space Grotesk",ui-sans-system,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --body:ui-sans-system,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--body);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--text);text-underline-offset:4px}
a:hover{color:var(--accent)}
::selection{background:var(--accent);color:var(--accent-ink)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 32px}
.narrow{max-width:var(--narrow)}
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--accent-ink);padding:10px 14px;z-index:50}
.skip:focus{left:12px;top:12px}
/* Header: 4 links only. */
.site-header{position:sticky;top:0;z-index:20;background:rgba(14,16,19,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text)}
.mark{width:38px;height:38px;flex:0 0 38px;display:grid;place-items:center}
.mark img{display:block;width:100%;height:100%}
.brand-text{font-family:var(--display);font-weight:700;font-size:22px;letter-spacing:-.01em;line-height:1}
.brand-text span{font-weight:500;color:var(--muted)}
.brand-tag{font-size:13px;color:var(--muted);border-left:1px solid var(--line2);padding-left:12px}
.nav{display:flex;gap:28px;align-items:center}
.nav a{color:var(--muted);text-decoration:none;font-size:15px;font-weight:500}
.nav a:hover{color:var(--text)}
.nav-toggle{display:none;background:none;border:1px solid var(--line2);border-radius:12px;padding:8px 14px;font:inherit;font-size:14px;cursor:pointer;color:var(--text)}
/* Hero: one proposition, not a name list. */
.hero{padding:96px 0 80px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero3d-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;overflow:hidden}
.hero3d{display:block;width:100%;height:420px;cursor:grab}
.hero3d:active{cursor:grabbing}
.hero3d-caption{margin:12px 4px 2px;color:var(--muted);font-size:13.5px;text-align:center}
/* CSS cube fallback: shown only if WebGL fails. */
.hero3d-fallback{height:420px;display:grid;place-items:center;position:relative}
.cube{width:120px;height:120px;position:relative;transform-style:preserve-3d;animation:spin 14s linear infinite}
.cube .face{position:absolute;inset:0;background:rgba(24,28,34,.9);border:2px solid var(--accent)}
.cube .front{transform:translateZ(60px)}
.cube .back{transform:rotateY(180deg) translateZ(60px)}
.cube .right{transform:rotateY(90deg) translateZ(60px)}
.cube .left{transform:rotateY(-90deg) translateZ(60px)}
.cube .top{transform:rotateX(90deg) translateZ(60px)}
.cube .bottom{transform:rotateX(-90deg) translateZ(60px)}
.hero3d-fallback .dot{position:absolute;top:22%;width:18px;height:18px;border-radius:50%;background:var(--accent)}
@keyframes spin{from{transform:rotateX(-18deg) rotateY(0)}to{transform:rotateX(-18deg) rotateY(360deg)}}
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .hero3d,.hero3d-fallback{height:300px}
}
.eyebrow{margin:0 0 20px;font-size:14px;font-weight:600;color:var(--accent)}
h1{margin:0 0 20px;font-family:var(--display);font-weight:700;font-size:clamp(44px,6vw,72px);line-height:1.02;letter-spacing:-.03em;max-width:16ch}
h1 .amber{color:var(--accent)}
.lead{margin:0 0 32px;max-width:62ch;color:var(--muted);font-size:19px;line-height:1.7}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 56px}
.btn{display:inline-block;text-decoration:none;font-size:15px;font-weight:600;padding:14px 22px;border-radius:999px;transition:transform .25s cubic-bezier(.22,1,.36,1),border-color .25s,background .25s}
.btn:hover{transform:translateY(-1px)}
.btn-solid{background:var(--accent);color:var(--accent-ink);border:1px solid var(--accent)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line2)}
.btn-ghost:hover{border-color:var(--accent)}
/* Sections and cards: one card style everywhere. */
.section{padding:88px 0}
.section h2{margin:0 0 12px;font-family:var(--display);font-weight:700;font-size:clamp(32px,4vw,48px);line-height:1.08;letter-spacing:-.025em}
.section-lead{max-width:62ch;color:var(--muted);margin:0 0 40px;font-size:18px;line-height:1.7}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.cards-three{grid-template-columns:repeat(3,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px;display:flex;flex-direction:column;gap:12px;transition:transform .25s cubic-bezier(.22,1,.36,1),border-color .25s}
.card:hover{transform:translateY(-3px);border-color:var(--line2)}
.card h3{margin:0;font-family:var(--display);font-weight:600;font-size:26px;line-height:1.15;letter-spacing:-.015em}
.card p{margin:0;color:var(--muted);font-size:16.5px;line-height:1.7;flex:1}
.card-meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.tag{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--muted);border:1px solid var(--line2);border-radius:999px;padding:4px 10px;text-transform:uppercase}
.tag-amber{color:var(--accent);border-color:var(--accent)}
.card-link{font-size:14px;font-weight:700;text-decoration:none}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:8px;padding-top:20px;border-top:1px solid var(--line)}
.stats dt{font-size:12px;color:var(--faint);margin:0 0 4px}
.stats dd{margin:0;font-family:var(--mono);font-size:15px;font-weight:700;color:var(--text)}
/* Steps: numbering is earned here, it is a sequence. */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.step-num{font-family:var(--display);font-weight:700;font-size:32px;color:var(--accent);margin:0 0 12px}
.step h3{margin:0 0 8px;font-family:var(--display);font-size:22px}
.step p{margin:0;color:var(--muted);font-size:16px;line-height:1.7}
/* Code and limits. */
.code{background:var(--panel);border:1px solid var(--line2);border-radius:var(--radius);padding:24px;overflow:auto;font-family:var(--mono);font-size:14px;line-height:1.7;color:var(--text2);margin:24px 0}
.code code{font:inherit}
.note{color:var(--muted);font-size:15px;line-height:1.7}
@media (max-width:900px){
  .studio3d{height:360px}
}

/* Original studio story: sticky 3D stage + scroll chapters, restored from the anthropic build. */
.story-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.story-stage{position:sticky;top:96px}
.story-stage-inner{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;overflow:hidden}
.plate-label{display:flex;justify-content:space-between;gap:16px;margin:2px 4px 10px;font-size:12px;color:var(--muted)}
.plate-label span:first-child{color:var(--accent);font-weight:700}
.viz-canvas{display:block;width:100%;height:auto;max-height:460px;border:1px solid var(--line);border-radius:12px;background:var(--panel);touch-action:none;cursor:grab}
.viz-canvas:active{cursor:grabbing}
.viz-canvas:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.viz-caption{margin:12px 4px 2px;color:var(--muted);font-size:13.5px;min-height:22px}
.story-chapters{display:flex;flex-direction:column}
.story-chapter{padding:44px 0;border-top:1px solid var(--line);min-height:56vh;display:flex;flex-direction:column;justify-content:center;opacity:.4;transition:opacity .3s ease}
.story-chapter:first-child{border-top:none}
.story-chapter.active{opacity:1}
.chapter-num{margin:0 0 12px;color:var(--accent);font-size:12px;letter-spacing:.08em;font-weight:700}
.story-chapter h3{margin:0 0 12px;font-family:var(--display);font-weight:600;font-size:clamp(26px,3vw,36px);line-height:1.15}
.story-chapter p{margin:0 0 12px;color:var(--muted);font-size:16.5px;line-height:1.7}
.rule{color:var(--accent)!important;font-weight:600;font-size:15px}
.points{list-style:none;margin:6px 0 0;padding:0;display:grid;gap:10px}
.points li{padding-left:24px;position:relative;color:var(--muted);font-size:15.5px;line-height:1.6}
.points li::before{content:"—";position:absolute;left:0;color:var(--accent);font-weight:700}
.points strong{color:var(--text)}
@media (max-width:900px){
  .story-layout{grid-template-columns:1fr;gap:28px}
  .story-stage{position:sticky;top:72px;z-index:10}
  .story-chapter{min-height:auto;padding:32px 0}
}

/* Contact form. */
.form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px;margin-top:32px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{margin:0 0 20px}
.field label{display:block;margin:0 0 8px;font-size:13px;font-weight:700;color:var(--muted)}
.field input,.field textarea{width:100%;background:var(--panel);border:1px solid var(--line2);border-radius:12px;color:var(--text);font:inherit;font-size:16px;padding:12px 14px}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.field textarea{min-height:140px;resize:vertical}
.feedback{margin:16px 0 0;min-height:24px;font-size:15px}
/* Footer: short, no credits clutter. */
.site-footer{border-top:1px solid var(--line);padding:48px 0}
.footer-inner{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;align-items:flex-start}
.footer-brand{margin:0;display:flex;align-items:center;gap:12px;font-family:var(--display);font-weight:700;font-size:26px}
.footer-inner p{margin:0;color:var(--muted);font-size:14px;line-height:1.7;max-width:52ch}
@media (max-width:900px){
  .cards,.cards-three,.steps{grid-template-columns:1fr}
  .section{padding:64px 0}
  .hero{padding:64px 0 56px}
}
@media (max-width:820px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px 32px 16px;align-items:flex-start}
  .nav.open{display:flex}
  .nav a{padding:12px 0;font-size:16px}
  .brand-tag{display:none}
  .form-row{grid-template-columns:1fr}
}
@media (max-width:480px){
  .wrap{padding:0 20px}
  .cta .btn{width:100%;text-align:center}
  .card{padding:24px}
  .form{padding:24px 20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important}
}