body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: #222; max-width: 640px; margin: 0 auto; padding: 24px; line-height: 1.5; }
h1 { font-size: 26px; margin-bottom: 4px; }
.sub { color: #666; margin-top: 0; }
.btn { display: inline-block; background: #00bfa5; color: #fff; text-decoration: none; padding: 14px 22px; border-radius: 10px; font-weight: 600; font-size: 18px; margin: 12px 0; }
.box { background: #f4f6f6; border-radius: 10px; padding: 14px 18px; margin: 16px 0; }
ol li { margin-bottom: 8px; }
small { color: #888; }