:root { --ink: #1d2433; --muted: #5a6478; --line: #e3e6ec; --accent: #2457d6; --bg: #ffffff; }
* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--ink); background: var(--bg); }
main, header, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 22px; }
header a.brand { font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
h1 { font-size: 34px; line-height: 1.2; margin: 40px 0 12px; }
h2 { font-size: 22px; margin: 32px 0 8px; }
p.lead { font-size: 20px; color: var(--muted); }
a { color: var(--accent); }
ul { padding-left: 22px; }
footer { border-top: 1px solid var(--line); margin-top: 56px; padding: 18px 20px 40px; color: var(--muted); font-size: 14px; }
.note { background: #f4f6fa; border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; }

h2.q { font-size: 18px; }