:root {
  --bg: #fbfaf7;
  --text: #1d1f24;
  --muted: #5b606b;
  --line: #e4e1da;
  --accent: #3b4fd8;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --text: #e9e7e2;
    --muted: #a3a7b0;
    --line: #2b2f37;
    --accent: #8f9cff;
    --card: #1b1e24;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover, a { color: var(--accent); }
main { padding: 56px 0 72px; }
h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 40px 0 8px; }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 40px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 32px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.note { color: var(--muted); font-size: 15px; }
footer { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }
table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
@media (max-width: 520px) { h1 { font-size: 30px; } nav a { margin-left: 14px; } }