.price-btn.active {
    background: #418c3a;
    color: white;
}

.solve-filter {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

.solve-btn {
    border: none;
    background: #f2f2f2;
    border-radius: 8px;
    padding: 0.2rem 0.6rem;
    cursor: pointer;
    font-size: 0.85rem;
}

.solve-btn.active {
    background: #3b82f6;
    color: white;
}