.fb-battery-filter-container {
    background-color: #ffffff;
    padding: 30px 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    margin: 20px 0;
    font-family: 'Inter', 'Roboto', sans-serif;
    max-width: 1000px;
}

.fb-battery-filter-container h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 24px;
    color: #333333;
    font-weight: 600;
}

.fb-battery-subtitle {
    color: #666666;
    margin-bottom: 25px;
    font-size: 14px;
}

.fb-battery-filter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.fb-filter-group {
    flex: 1;
    min-width: 150px;
}

.fb-select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 14px;
    color: #333;
    background-color: #fff;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
    cursor: pointer;
    outline: none;
    transition: border-color 0.3s ease;
}

.fb-select:focus {
    border-color: #0056b3;
}

.fb-select option {
    padding: 10px;
}

.fb-filter-submit {
    flex: 0 0 auto;
}

.fb-btn-filter {
    background-color: #0056b3;
    color: #ffffff;
    border: none;
    padding: 12px 30px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    height: 100%;
    text-transform: uppercase;
}

.fb-btn-filter:hover {
    background-color: #004494;
}

/* Responsiveness */
@media (max-width: 768px) {
    .fb-battery-filter-form {
        flex-direction: column;
        align-items: stretch;
    }
    .fb-filter-group {
        width: 100%;
    }
    .fb-filter-submit {
        width: 100%;
        margin-top: 10px;
    }
    .fb-btn-filter {
        width: 100%;
    }
}