:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #4a6cf7;
  --card: #f5f5f7;
  --border: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #7b93ff;
    --card: #1c1c1e;
    --border: #2c2c2e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 32px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 20px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 36px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.summary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 22px;
  margin: 24px 0;
}
.summary li { margin: 6px 0; }
nav { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 15px; }
nav a { margin-right: 18px; }
.hero { text-align: center; padding-top: 24px; }
.hero img { width: 120px; height: 120px; border-radius: 27px; box-shadow: 0 12px 32px rgba(74, 108, 247, 0.35); }
.hero h1 { font-size: 44px; margin-top: 24px; }
details { background: var(--card); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
summary { font-weight: 600; cursor: pointer; }