:root {
  --bg: #EEF2F5;
  --surface: #FFFFFF;
  --text: #1A2233;
  --muted: #5B667A;
  --link: #0B7F72;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121826;
    --surface: #1C2436;
    --text: #E8EDF4;
    --muted: #A3AEC0;
    --link: #2BC4B1;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 680px;
  margin: 32px auto;
  padding: 28px 24px;
  background: var(--surface);
  border-radius: 20px;
}

@media (max-width: 720px) {
  main { margin: 0; border-radius: 0; padding: 24px 16px; }
}

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, ul { margin: 0 0 14px; }
.muted { color: var(--muted); }
a { color: var(--link); }