:root {
  --bg: #0f1714;
  --fg: #e7efe9;
  --muted: #9bb0a3;
  --accent: #6fbf8a;
  --rule: #24332b;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1c3328 0%, transparent 55%),
    linear-gradient(160deg, #0c1210, #121c18 45%, #0f1714);
  color: var(--fg);
  font-family: IBM Plex Sans, Segoe UI, sans-serif;
}
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 18vh 1.5rem 4rem;
}
.mark {
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 1rem;
}
h1 {
  font-family: IBM Plex Serif, Georgia, serif;
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}
.lede {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
  margin: 0 0 2rem;
  max-width: 32rem;
}
nav {
  display: flex;
  gap: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover { border-bottom-color: var(--accent); color: var(--accent); }