:root { --ink: #1d2733; --muted: #5b6b7c; --line: #dfe6ee; --bg: #f7f9fb; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 24px; }
header { padding-top: 48px; border-bottom: 1px solid var(--line); }
h1 { margin: 0 0 4px; font-size: 28px; letter-spacing: -0.01em; }
.tagline { margin: 0 0 20px; color: var(--muted); }
nav a { display: inline-block; margin-right: 18px; padding-bottom: 12px; color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--ink); }
main { padding: 32px 24px 24px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
h2:first-child { margin-top: 0; }
p, li { color: #2c3946; }
ul { padding-left: 20px; }
footer { margin-top: 24px; padding: 20px 24px 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }