body { font-family: sans-serif; margin: 0; padding: 0; background: #f4f8fb; }
header, footer { background: #007BFF; color: white; padding: 1rem; text-align: center; }
nav a { color: white; margin: 0 10px; text-decoration: none; }
main { padding: 2rem; }
.tool-grid { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.tool-grid a { display: block; padding: 1rem; background: white; border: 1px solid #ccc; border-radius: 8px; width: 200px; text-align: center; text-decoration: none; color: #333; transition: 0.3s; }
.tool-grid a:hover { background: #e0f0ff; }
.ad-banner-top, .ad-footer { margin: 1rem auto; padding: 1rem; text-align: center; background: #ddd; }