.filter-controls {
    margin-bottom: 2rem;
}

.filter-category {
    margin-bottom: 1.5rem;
}

.filter-category h4 {
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-button {
    padding: 0.5rem 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-button:hover {
    background: #f5f5f5;
}

.filter-button.active {
    background: #007bff;
    color: #fff;
    border-color: #007bff;
}

/* Animation for cards */
.document-card {
    transition: opacity 0.3s ease;
}

.document-card[style*="display: none"] {
    opacity: 0;
}