:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --border: #e2e6ea;
  --text: #14181c;
  --muted: #5a6672;
  --accent: #1f6feb;
  --accent-ink: #ffffff;
  --radius: 12px;
  --maxw: 720px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #262c34;
    --text: #e6edf3;
    --muted: #9aa7b4;
    --accent: #4b90ff;
    --accent-ink: #06101f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
header.site {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; letter-spacing: -0.01em; text-decoration: none; color: var(--text); }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); display: inline-block; }
main { padding: 56px 0 40px; }
h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 20px; }
h2 { font-size: 20px; letter-spacing: -0.01em; margin: 32px 0 10px; }
p { margin: 0 0 16px; }
.lead { font-size: clamp(18px, 2.5vw, 21px); color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 24px 0;
}
.contact { font-weight: 600; }
ul { padding-left: 20px; margin: 0 0 16px; }
li { margin: 6px 0; }
footer.site {
  border-top: 1px solid var(--border);
  padding: 24px 0 48px;
  color: var(--muted);
  font-size: 14px;
}
footer.site a { color: var(--muted); text-decoration: underline; margin-right: 16px; }
.back { display: inline-block; margin-bottom: 24px; font-size: 14px; }