:root {
  --bg: #f5f5fa;
  --card: #ffffff;
  --text: #14141f;
  --muted: #55556a;
  --accent: #4338ca;
  --border: #dcdce8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c13;
    --card: #1a1a25;
    --text: #f3f3f8;
    --muted: #a9a9bc;
    --accent: #a5a8ff;
    --border: #30303f;
  }
}

* { box-sizing: border-box; }

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

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 15px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
a { color: var(--accent); }
nav { margin-top: 40px; font-size: 15px; }