/* フィルターセクション */
.filter-section {
    background: #ffffff;
    border: 1px solid #E5E7EB;
    border-radius: 12px;
    margin-bottom: 2rem;
    max-width: 100%;
    box-sizing: border-box;
}

.filter-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease;
}

.filter-toggle:hover {
    background: #F9FAFB;
}

.filter-toggle-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #374151;
    margin: 0;
}

.filter-title i {
    color: #4A90A4;
}

.filter-toggle-icon {
    color: #6B7280;
    transition: transform 0.3s ease;
}

.filter-section.open .filter-toggle-icon {
    transform: rotate(180deg);
}

.filter-content {
    display: none;
    padding: 0 1.5rem 1.5rem 1.5rem;
    border-top: 1px solid #E5E7EB;
}

.filter-section.open .filter-content {
    display: block;
}

.filter-groups {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding-top: 1.25rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #6B7280;
    margin-bottom: 0.25rem;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    max-width: 100%;
}

.filter-option {
    position: relative;
}

.filter-option input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.filter-option label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: #F9FAFB;
    border: 1px solid #E5E7EB;
    border-radius: 20px;
    font-size: 0.95rem;
    color: #374151;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    text-align: center;
}

.filter-option label:hover {
    background: #F3F4F6;
    border-color: #D1D5DB;
}

.filter-option input[type="checkbox"]:checked + label {
    background: #4A90A4;
    border-color: #4A90A4;
    color: white;
    font-weight: 600;
}

.filter-option label i {
    display: none;
}

.filter-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #E5E7EB;
}

.filter-reset {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid #D1D5DB;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #6B7280;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-reset:hover {
    background: #F9FAFB;
    border-color: #9CA3AF;
    color: #374151;
}

.filter-results {
    font-size: 0.85rem;
    color: #6B7280;
    padding: 0.5rem 1rem;
}

.filter-results strong {
    color: #4A90A4;
    font-weight: 600;
}

/* カードのフィルター状態 */
.question-card.filtered-out {
    display: none !important;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .filter-section {
        padding: 1.25rem;
    }
    
    .filter-groups {
        gap: 1rem;
    }
    
    .filter-options {
        gap: 0.4rem;
    }
    
    .filter-option label {
        padding: 0.4rem 0.85rem;
        font-size: 0.85rem;
    }
    
    .filter-actions {
        flex-direction: column;
    }
    
    .filter-reset {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .filter-section {
        padding: 1rem;
    }
    
    .filter-title {
        font-size: 0.9rem;
    }
    
    .filter-group-label {
        font-size: 0.8rem;
    }
    
    .filter-option label {
        padding: 0.35rem 0.75rem;
        font-size: 0.75rem;
    }
}