:root {
  color-scheme: dark light;
  --bg: #0b1120;
  --bg-alt: #111827;
  --bg-card: #151f30;
  --text: #e2e8f0;
  --text-dim: #8892a6;
  --text-bright: #f8fafc;
  --accent: #34d399;
  --accent-hover: #6ee7b7;
  --accent-dim: rgba(52, 211, 153, 0.12);
  --accent-text: #0b1120;
  --project-accent: #4f46e5;
  --border: #1e293b;
  --radius: 10px;
  --radius-lg: 14px;
  --max-width: 960px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-alt: #f3f4f6;
    --bg-card: #ffffff;
    --text: #1a202c;
    --text-dim: #5a6577;
    --text-bright: #0f141a;
    --accent: #047857;
    --accent-hover: #065f46;
    --accent-dim: rgba(4, 120, 87, 0.08);
    --accent-text: #ffffff;
    --border: #e2e8f0;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
nav, .hero-grid, main > section, footer { width: min(calc(100% - 4rem), var(--max-width)); margin-inline: auto; }
nav { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 0; }
.wordmark, h1 { font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace; }
.wordmark { color: var(--text-bright); font-weight: 700; text-decoration: none; }
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a, footer a { color: var(--text-dim); font-size: 0.9rem; text-decoration: none; }
.nav-links a:hover, footer a:hover { color: var(--accent); }
.hero {
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 55% at 75% 0%, color-mix(in srgb, var(--project-accent) 22%, transparent), transparent),
    var(--bg);
  padding-bottom: 5rem;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 4rem; align-items: center; padding-top: 5rem; }
.eyebrow { color: var(--accent); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
h1 { margin: 0.3rem 0 0; color: var(--text-bright); font-size: clamp(2.6rem, 7vw, 4.7rem); letter-spacing: -0.05em; line-height: 1; }
.tagline { margin: 1.2rem 0 0; color: var(--accent); font-size: 1.25rem; font-weight: 600; }
.subtitle { max-width: 38rem; color: var(--text-dim); }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.button { display: inline-flex; padding: 0.65rem 1.3rem; border: 1px solid transparent; border-radius: 8px; font-size: 0.9rem; font-weight: 700; text-decoration: none; }
.button.primary { background: var(--accent); color: var(--accent-text); }
.button.primary:hover { background: var(--accent-hover); }
.button.secondary { border-color: var(--border); background: var(--accent-dim); color: var(--accent); }
.proof-panel { position: relative; display: grid; gap: 0.75rem; padding: 1.25rem; border: 1px solid var(--border); border-radius: var(--radius-lg); background: color-mix(in srgb, var(--bg-card) 94%, var(--project-accent)); }
.proof-panel::before { position: absolute; inset: -1px auto -1px -1px; width: 3px; border-radius: var(--radius-lg) 0 0 var(--radius-lg); background: var(--project-accent); content: ""; }
.proof-step { display: grid; grid-template-columns: 2rem 1fr; column-gap: 0.8rem; }
.step-number { grid-row: span 2; color: var(--accent); font-family: ui-monospace, monospace; font-weight: 800; }
.proof-step h3, .highlight-card h3 { margin: 0; color: var(--text-bright); font-size: 1rem; }
.proof-step p, .highlight-card p { margin: 0.2rem 0 0; color: var(--text-dim); font-size: 0.92rem; }
main > section { padding-block: 5rem; }
h2 { margin: 0.4rem 0 1rem; color: var(--text-bright); font-size: clamp(1.7rem, 4vw, 2.5rem); letter-spacing: -0.03em; line-height: 1.2; }
.problem-section .section-copy { max-width: 46rem; }
.problem-section p:last-child, .evidence-section p { color: var(--text-dim); }
.highlights-section { width: 100%; max-width: none; padding-inline: max(2rem, calc((100% - var(--max-width)) / 2)); background: var(--bg-alt); }
.section-heading { max-width: var(--max-width); margin: 0 auto 2rem; }
.highlight-grid, .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; max-width: var(--max-width); margin: 0 auto; }
.highlight-card, .related-card { padding: 1.35rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-card); }
.highlight-card { border-top-color: var(--project-accent); }
.evidence-section { display: grid; grid-template-columns: 1fr 0.7fr; gap: 4rem; align-items: end; }
.evidence-actions, .cosmos-links { display: flex; flex-direction: column; gap: 0.75rem; }
.evidence-actions a, .cosmos-links a { color: var(--accent); font-weight: 650; text-underline-offset: 0.2em; }
.related-card { display: flex; flex-direction: column; text-decoration: none; }
.related-card strong { color: var(--text-bright); }
.related-card span { color: var(--text-dim); font-size: 0.9rem; }
.cosmos-links { margin-top: 2rem; }
footer { display: flex; justify-content: space-between; gap: 2rem; padding-block: 3rem; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 0.85rem; }
footer div { display: flex; gap: 1.25rem; }
.composition-signal .hero-copy { text-align: center; }
.composition-signal .hero-grid { grid-template-columns: 1fr; }
.composition-signal .subtitle, .composition-signal .actions { margin-inline: auto; justify-content: center; }
.composition-signal .proof-panel { grid-template-columns: repeat(3, 1fr); }
.composition-workbench .proof-panel { transform: rotate(0.6deg); box-shadow: 0 16px 70px color-mix(in srgb, var(--project-accent) 12%, transparent); }

@media (max-width: 640px) {
  nav, .hero-grid, main > section, footer { width: min(calc(100% - 2.5rem), var(--max-width)); }
  .nav-links a:first-child { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; padding-top: 3rem; }
  main > section { padding-block: 3.5rem; }
  .highlights-section { width: 100%; padding-inline: 1.25rem; }
  .highlight-grid, .related-grid, .composition-signal .proof-panel, .evidence-section { grid-template-columns: 1fr; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}