* { box-sizing: border-box; }
body { font-family: system-ui, sans-serif; margin: 0; padding: 1rem; max-width: 800px; margin-left: auto; margin-right: auto; }
header { border-bottom: 1px solid #ddd; padding-bottom: 1rem; margin-bottom: 1.5rem; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { color: #0066cc; text-decoration: none; }
nav a:hover { text-decoration: underline; }
h1 { margin-top: 0; }
footer { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid #ddd; color: #666; font-size: 0.9rem; }
ul { padding-left: 1.25rem; }
form label { display: block; margin-top: 0.5rem; }
form input, form textarea, form button { width: 100%; max-width: 400px; padding: 0.5rem; margin-top: 0.25rem; }
form button { margin-top: 1rem; background: #0066cc; color: #fff; border: none; cursor: pointer; }
form button:hover { background: #0052a3; }
.product-list { display: grid; gap: 1rem; }
.product-card { border: 1px solid #ddd; padding: 1rem; border-radius: 4px; }
.test-notes { background: #fff3cd; border: 1px solid #ffc107; padding: 0.75rem; margin: 1rem 0; font-size: 0.9rem; }