body { font-family: system-ui, sans-serif; margin: 0; padding: 0; background: #f4f4f4; color: #333; }
header { background: #fff; padding: 2rem; text-align: center; border-bottom: 1px solid #ddd; }
nav a { margin: 0 0.5rem; text-decoration: none; color: #0073e6; }
main { max-width: 800px; margin: 2rem auto; background: #fff; padding: 2rem; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
h1, h2 { color: #222; }
.adsense-slot { margin: 2rem 0; background: #f9f9f9; border: 1px dashed #ccc; padding: 1rem; text-align: center; color: #999; }
footer { text-align: center; font-size: 0.8rem; padding: 2rem; color: #777; }