:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #111827;
  --muted: #5b6474;
  --border: #e3e6eb;
  --accent: #111827;
  --accent-text: #ffffff;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --surface: #121826;
    --text: #f3f4f6;
    --muted: #9aa3b2;
    --border: #232b3b;
    --accent: #f3f4f6;
    --accent-text: #0b0f17;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: inherit; cursor: pointer; }
.shell { max-width: 1080px; margin: 0 auto; padding: 0 20px; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; text-decoration: none; }
.hero { padding: 12vh 0 8vh; max-width: 760px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.8rem; font-weight: 700; color: var(--muted); margin: 0 0 12px; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 18px; }
.lead { font-size: 1.15rem; color: var(--muted); margin: 0; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.button {
  display: inline-flex; align-items: center; padding: 11px 18px; border-radius: 10px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--accent-text); font-weight: 600; text-decoration: none;
}
.button-ghost { background: transparent; color: var(--text); border-color: var(--border); }
a:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; padding-bottom: 10vh; }
.features article { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 6px 20px 14px; }
.features h2 { font-size: 1.05rem; margin: 14px 0 6px; }
.features p { margin: 0; color: var(--muted); }
.footer { border-top: 1px solid var(--border); padding: 18px 0 28px; color: var(--muted); font-size: 0.85rem; }
.footer p { margin: 0; max-width: 80ch; }