.background-rooms{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin:16px 0}
.background-room{position:relative;display:flex;flex-direction:column;gap:8px;padding:10px;border:1px solid #31543a;border-radius:10px;background:#07150d}
.background-room img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:6px}
.background-room input{position:absolute;top:14px;left:14px;width:22px;height:22px;accent-color:#85ff45}
.background-room:has(input:checked){border-color:#85ff45}
.background-groups{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.background-groups button,.background-schedule button{padding:10px;font-size:12px}
.background-schedule{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:8px;margin:10px 0}
#backgroundPreview{width:100%;max-width:640px;aspect-ratio:16/9;object-fit:contain;border-radius:10px;background:#07150d}
@media(max-width:600px){.background-schedule{grid-template-columns:1fr 1fr}.background-rooms{grid-template-columns:1fr 1fr}}