:root {
  --brand: #4F46E5;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #555;
  --border: #e5e5e5;
  --max: 720px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --fg: #f1f1f1;
    --muted: #aaa;
    --border: #2a2a2a;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); }
body { font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Inter, system-ui, sans-serif; line-height: 1.5; }
main { max-width: var(--max); margin: 0 auto; padding: 48px 24px; }

header { text-align: center; padding: 48px 0; }
h1 { font-size: 2.5rem; margin: 0 0 12px; }
.tagline { font-size: 1.15rem; color: var(--muted); margin: 0 0 24px; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.btn { display: inline-block; padding: 12px 18px; border-radius: 12px; border: 1px solid var(--border); color: var(--fg); text-decoration: none; font-weight: 600; }
.btn.primary { background: var(--brand); color: #fff; border-color: var(--brand); }

section.features { padding: 32px 0; border-top: 1px solid var(--border); }
section.features h2 { font-size: 1.25rem; margin: 0 0 12px; }
section.features ul { list-style: none; padding: 0; margin: 0; }
section.features li { padding: 8px 0; border-bottom: 1px solid var(--border); }

footer { padding: 32px 0; text-align: center; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--border); }
footer a { color: var(--muted); margin: 0 6px; }
.copy { margin-top: 12px; }

.em-btn {
  font: inherit;
  color: var(--brand);
  background: none;
  border: 1px solid var(--brand);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
}
.em-btn:hover { background: var(--brand); color: #fff; }

.prose h1 { font-size: 2rem; }
.prose h2 { font-size: 1.25rem; margin-top: 28px; }
.prose h3 { font-size: 1.05rem; margin-top: 18px; }
.prose p, .prose li { color: var(--fg); }
.prose a { color: var(--brand); }