:root {
  --bg: #000000;
  --header: #0f4f3a;
  --accent: #4ade80;
  --text: #f4f4f5;
  --muted: #8e8e93;
  --card: #141416;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
header {
  background: var(--header);
  padding: 1.25rem 1.5rem;
}
header a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
}
nav {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.5rem;
  font-size: 0.95rem;
}
nav a { color: #fff; text-decoration: none; opacity: 0.9; }
nav a:hover { color: var(--accent); }
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
h1 { font-size: 1.75rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; color: var(--accent); }
.lede { color: var(--muted); margin-bottom: 1.5rem; }
.card {
  background: var(--card);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  margin: 1rem 0;
}
a { color: var(--accent); }
footer {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  color: var(--muted);
  font-size: 0.85rem;
}