body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f9fafb; color: #333; }
header { background: #2563eb; color: #fff; padding: 1rem; text-align: center; }
nav { background: #1e40af; padding: 0.5rem; text-align: center; }
nav a { color: #fff; margin: 0 0.5rem; text-decoration: none; font-weight: bold; }
nav a:hover { text-decoration: underline; }
main { max-width: 800px; margin: auto; padding: 1rem; background: #fff; margin-top: 1rem; border-radius: 8px; box-shadow: 0 2px 6px rgba(0,0,0,0.1); }
label { display: block; margin-top: 1rem; }
input, select { width: 100%; padding: 0.5rem; margin-top: 0.25rem; border: 1px solid #ccc; border-radius: 4px; }
button { margin-top: 1rem; padding: 0.6rem 1rem; border: none; border-radius: 4px; background: #2563eb; color: #fff; cursor: pointer; }
button:hover { background: #1d4ed8; }
.result { margin-top: 1.5rem; padding: 1rem; background: #f1f5f9; border-radius: 6px; }
footer { margin-top: 2rem; text-align: center; padding: 1rem; font-size: 0.8rem; color: #666; }