body { font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Inter", sans-serif; color: #0f172a; background: #f8fafc; margin: 0; }
main { max-width: 640px; margin: 0 auto; padding: 40px 20px 64px; }
h1 { font-size: 32px; margin: 0 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p.sub { color: #64748b; margin: 0 0 24px; }
a { color: #0f172a; }
nav { font-size: 15px; color: #64748b; margin-bottom: 32px; }
nav a { color: #64748b; margin-right: 16px; }
.note { background: #fff; border: 1px solid #e2e8f0; border-radius: 12px; padding: 16px; }