:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #e3e3e8;
  --accent: #0a6cf0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --card: #1c1c1f;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: #2e2e33;
    --accent: #4b9bff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; }
header h1 { margin: 0; font-size: 32px; letter-spacing: -0.02em; }
header p { margin: 0; color: var(--muted); }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 24px 0 32px; font-size: 15px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
}
section > h2 { margin: 0 0 4px; font-size: 24px; letter-spacing: -0.01em; }
h3 { margin: 24px 0 4px; font-size: 17px; }
p, ul { margin: 8px 0; }
ul { padding-left: 20px; }
.muted { color: var(--muted); font-size: 15px; }
.mail {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.mail:hover { text-decoration: none; opacity: 0.9; }
footer { color: var(--muted); font-size: 14px; text-align: center; }