/* タグとグループのスタイル */
.tag-filter-container {
    margin: 20px 0;
    padding: 15px;
    background-color: #f5f5f5;
    border-radius: 5px;
}

.tag-btn, .category-btn {
    display: inline-block;
    padding: 5px 12px;
    margin: 5px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 15px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s;
}

.tag-btn:hover, .category-btn:hover {
    background-color: #0056b3;
    transform: scale(1.05);
}

.tag-btn.active, .category-btn.active {
    background-color: #28a745;
}

.article-item {
    margin: 20px 0;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: all 0.3s;
}

.article-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.article-item.hidden {
    display: none;
}

.article-tags {
    margin-top: 10px;
}

.article-tag {
    display: inline-block;
    padding: 3px 8px;
    margin: 2px;
    background-color: #6c757d;
    color: white;
    border-radius: 10px;
    font-size: 0.85em;
}

.article-category {
    display: inline-block;
    padding: 3px 8px;
    margin-right: 10px;
    background-color: #17a2b8;
    color: white;
    border-radius: 5px;
    font-size: 0.85em;
    font-weight: bold;
}

.filter-section {
    margin-bottom: 15px;
}

.filter-section h3 {
    margin-bottom: 10px;
    color: #333;
}

.reset-btn {
    padding: 8px 15px;
    margin: 10px 5px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.reset-btn:hover {
    background-color: #c82333;
}