:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #5856d6;
  --line: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #7d7aff;
    --line: #38383a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 18px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
header { text-align: center; margin-bottom: 28px; }
header h1 { font-size: 34px; line-height: 1.15; margin: 8px 0 6px; letter-spacing: -0.02em; }
header p { color: var(--muted); margin: 0; }
.mark {
  width: 64px; height: 64px; margin: 0 auto; border-radius: 15px;
  background: linear-gradient(160deg, #8e5cff, #ff2d78);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 30px;
}
section { background: var(--card); border-radius: 18px; padding: 20px 22px; margin: 14px 0; }
section h2 { font-size: 20px; margin: 0 0 8px; }
section p { margin: 8px 0; }
section ul { margin: 8px 0; padding-left: 22px; }
section li { margin: 6px 0; }
.short { border: 2px solid var(--accent); }
.short p { font-size: 19px; }
a { color: var(--accent); }
footer { text-align: center; color: var(--muted); font-size: 15px; margin-top: 28px; }
footer a { margin: 0 8px; }