:root {
  --ink: #16181d;
  --muted: #5b6170;
  --bg: #fbfaf7;
  --accent: #1f5f4a;
  --accent-ink: #ffffff;
  --rule: #e4e1d9;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #ecebe6; --muted: #a3a8b3; --bg: #121417; --accent: #5fbf98; --accent-ink: #0d1411; --rule: #2a2e35; }
}
* { box-sizing: border-box; }
body { margin: 0; }
.wrap { max-width: 44rem; margin: 0 auto; padding: 0 1.25rem; }
header { padding-top: 1.5rem; }
.mark { font-weight: 700; letter-spacing: .02em; margin: 0; }
section { padding: 2.25rem 0; border-top: 1px solid var(--rule); }
.hero { border-top: 0; padding-top: 3.5rem; }
h1 { font-size: clamp(2rem, 6vw, 3.1rem); line-height: 1.1; margin: 0 0 1.25rem; }
h1 span { color: var(--accent); }
h2 { font-size: 1.3rem; margin: 0 0 .9rem; }
.lede { font-size: 1.15rem; color: var(--muted); max-width: 38rem; }
.note { font-size: .92rem; color: var(--muted); }
.cta {
  display: inline-block; margin-top: .5rem; padding: .75rem 1.25rem; border-radius: .5rem;
  background: var(--accent); color: var(--accent-ink); font-weight: 600; text-decoration: none;
}
.cta:hover, .cta:focus-visible { filter: brightness(1.1); }
.cta:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
.steps, .rules { padding-left: 1.25rem; }
.steps li, .rules li { margin-bottom: .6rem; }
.close { text-align: left; }
footer { padding: 2rem 1.25rem 3rem; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--rule); }
footer a { color: inherit; }