:root {
  color-scheme: dark;
  --ink: #f4f7f5;
  --muted: #a9b7b0;
  --line: #26352e;
  --panel: #101713;
  --accent: #72f5bc;
  --accent-ink: #06130d;
  --page: #080d0a;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); }
a { color: inherit; }

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; letter-spacing: .08em; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--accent); border-radius: 10px; color: var(--accent); }
.site-header nav, footer nav { display: flex; gap: 24px; }
.site-header nav a, footer nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover, footer nav a:hover { color: var(--ink); }

.hero { min-height: 690px; display: grid; align-content: center; justify-items: start; border-bottom: 1px solid var(--line); }
.eyebrow { color: var(--accent); font-size: .78rem; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
h1 { max-width: 980px; margin: 18px 0 28px; font-size: clamp(3.5rem, 9vw, 7.8rem); line-height: .89; letter-spacing: -.065em; }
.hero-copy { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.45rem); line-height: 1.65; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button { padding: 14px 20px; border-radius: 10px; font-weight: 750; text-decoration: none; }
.primary { background: var(--accent); color: var(--accent-ink); }
.secondary { border: 1px solid var(--line); }
.channel-note { margin: 14px 0 0; color: var(--muted); font-size: .88rem; }

.principles { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.principles article { min-height: 310px; padding: 46px 36px; border-right: 1px solid var(--line); }
.principles article:last-child { border-right: 0; }
.principles span { color: var(--accent); font: 700 .8rem/1 ui-monospace, monospace; }
h2 { margin: 26px 0 16px; font-size: clamp(2rem, 4vw, 4rem); line-height: 1; letter-spacing: -.045em; }
.principles h2 { font-size: 1.6rem; letter-spacing: -.02em; }
.principles p, .feature-copy, .contact p { color: var(--muted); line-height: 1.7; }

.feature, .contact { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; padding: 120px 0; border-bottom: 1px solid var(--line); }
.feature h2, .contact h2 { max-width: 580px; }
.feature-copy { padding-top: 30px; font-size: 1.08rem; }

.model { padding: 120px 0; border-bottom: 1px solid var(--line); }
.model > h2 { max-width: 920px; }
.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 54px; background: var(--line); border: 1px solid var(--line); }
.model-grid p { margin: 0; min-height: 130px; display: flex; align-items: flex-end; padding: 24px; background: var(--panel); font-weight: 700; }

.contact-link { display: inline-block; margin-top: 40px; color: var(--accent); font-size: clamp(1.35rem, 3vw, 2.4rem); font-weight: 750; text-underline-offset: 8px; }
footer { min-height: 150px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: var(--muted); font-size: .9rem; }

.legal { max-width: 820px; padding: 90px 0 120px; }
.legal h1 { font-size: clamp(3rem, 7vw, 6rem); }
.legal h2 { margin-top: 52px; font-size: 1.45rem; letter-spacing: -.02em; }
.legal p, .legal li { color: var(--muted); line-height: 1.75; }
.legal a { color: var(--accent); }
.legal .updated { font: .8rem/1.5 ui-monospace, monospace; color: var(--accent); }

@media (max-width: 760px) {
  .site-header { align-items: flex-start; padding: 22px 0; }
  .site-header nav { display: none; }
  .hero { min-height: 590px; }
  .principles, .feature, .contact, .model-grid { grid-template-columns: 1fr; }
  .principles article { border-right: 0; border-bottom: 1px solid var(--line); }
  .principles article:last-child { border-bottom: 0; }
  .feature, .contact { gap: 20px; padding: 80px 0; }
  .model { padding: 80px 0; }
  footer { padding: 40px 0; align-items: flex-start; flex-direction: column; }
  footer nav { flex-wrap: wrap; gap: 14px 20px; }
}

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