* { box-sizing: border-box; margin: 0; }
body {
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1a1f2e; background: #fafbfc; max-width: 760px; margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}
header { margin-bottom: 2.5rem; }
header .brand { font-weight: 700; font-size: 1.05rem; letter-spacing: .02em; }
header .brand a { color: #1a1f2e; text-decoration: none; }
header nav { margin-top: .3rem; font-size: .9rem; }
header nav a { color: #2563eb; text-decoration: none; margin-right: 1rem; }
header nav a:hover { text-decoration: underline; }
h1 { font-size: 1.7rem; margin-bottom: .4rem; }
.updated { color: #6b7280; font-size: .85rem; margin-bottom: 2rem; }
h2 { font-size: 1.15rem; margin: 1.8rem 0 .5rem; }
p, li { margin-bottom: .6rem; }
ul { padding-left: 1.4rem; }
a { color: #2563eb; }
footer {
  margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid #e5e7eb;
  color: #6b7280; font-size: .8rem;
}