body { margin: 0; background: #fff; color: #222; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { margin: 0 0 8px; font-size: 30px; line-height: 1.25; color: #b81414; }
h2 { margin: 28px 0 6px; font-size: 18px; }
a { color: #b81414; }
nav { margin-top: 28px; }
nav a { margin-right: 16px; font-weight: 600; }
.ngay, .lien-he { color: #666; }