:root {
  --bg: #f4fbfa;
  --text: #1f2430;
  --muted: #5b6275;
  --accent: #2a9d92;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root { --bg: #171b24; --text: #e8ebf2; --muted: #a3aabb; --accent: #4fd1c5; --card: #202634; }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 48px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
  border-radius: 16px;
  background: var(--card);
}

h1 { margin-top: 0; font-size: 28px; }
h2 { margin-top: 32px; font-size: 20px; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 14px; }
.back { display: inline-block; margin-bottom: 16px; font-weight: 700; text-decoration: none; }
li { margin-bottom: 6px; }