/* アコーディオン */

.article-accordion {
    margin: 0 0 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
}

.article-accordion-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    cursor: pointer;
    list-style: none;
    background: #f7f7f7;
    transition: .2s;
}

.article-accordion-summary:hover {
    background: #f0f0f0;
}

.article-accordion-summary::-webkit-details-marker {
    display: none;
}

.article-accordion-title {
    font-size: 1.2rem;
    font-weight: bold;
}

.article-accordion-icon {
    font-size: 0.9rem;
    color: #666;
}

.article-accordion-icon::after {
    content: "＋";
}

.article-accordion[open] .article-accordion-icon::after {
    content: "－";
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    padding: 20px;
}

.article-card {
    display: block;
    padding: 18px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #fff;
    text-decoration: none;
    color: inherit;
    transition: .2s;
}

.article-card:hover {
    border-color: #0d6efd;
    transform: translateY(-2px);
}

.article-number {
    display: inline-block;
    margin-bottom: 8px;
    font-size: 0.8rem;
    font-weight: bold;
    color: #0d6efd;
}

.article-title {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
    line-height: 1.5;
}

.article-desc {
    display: block;
    font-size: 0.9rem;
    color: #666;
    line-height: 1.7;
}


/*  */