:root {
  color-scheme: light dark;
  --accent: #7c5cbf;
  --text: #1c1b1f;
  --muted: #5f5b66;
  --bg: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --accent: #b39ddb;
    --text: #e6e1e9;
    --muted: #a49fac;
    --bg: #141218;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  padding: 32px 20px 64px;
  max-width: 720px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
h1 { font-size: 1.7rem; line-height: 1.25; }
h2 { font-size: 1.15rem; margin-top: 2em; }
a { color: var(--accent); }
.brand { font-weight: 700; color: var(--accent); text-decoration: none; }
.effective { color: var(--muted); font-size: 0.95rem; }
footer { margin-top: 3em; color: var(--muted); font-size: 0.9rem; }
li { margin-bottom: 0.4em; }