* { box-sizing: border-box; font-family: sans-serif; }
body { background: #f0f2f5; margin: 0; padding: 0; display: flex; flex-direction: column; min-height: 100vh; }
header { background: #1a73e8; color: white; text-align: center; padding: 15px; }
.ad-slot { background: #ddd; text-align: center; padding: 20px; margin: 10px; border: 2px dashed #999; color: #666; font-size: 14px; }
main { flex: 1; padding: 20px; max-width: 600px; margin: 0 auto; width: 100%; }
.search-box { display: flex; gap: 10px; margin-bottom: 20px; flex-direction: column; }
@media(min-width: 480px) { .search-box { flex-direction: row; } }
input { flex: 1; padding: 12px; font-size: 16px; border: 1px solid #ccc; border-radius: 5px; }
button { padding: 12px 20px; font-size: 16px; background: #1a73e8; color: white; border: none; border-radius: 5px; cursor: pointer; }
button:hover { background: #0d47a1; }
.result-container { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); display: none; }
.result-container.active { display: block; }
.error-msg { color: red; font-weight: bold; }
.success-msg { color: green; font-weight: bold; }
.detail-row { margin: 10px 0; border-bottom: 1px solid #eee; padding-bottom: 5px; }
.warning-box { background: #fff3cd; color: #856404; padding: 10px; border-radius: 5px; font-size: 14px; margin-top: 15px; }
footer { text-align: center; padding: 15px; font-size: 12px; color: #666; background: #fff; }