/* ===== Layout ===== */
.blog-container {
    display: grid;
    grid-template-columns: 4fr 1fr; /* 本文:サイドバー = 3:1（本文広め） */
    gap: 8px;
    margin: 8px 0;
    min-height: 500px;
}

/* ===== Main ===== */
.blog-content {
    background: #fff;
    padding: 1rem;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.blog-post {
    margin-bottom: 1rem;
    padding: 5px;
}

/* ===== Sidebar ===== */
.blog-sidebar {
    background: #f8f9fa;
    padding: 10px;
    border-left: 1px solid #dee2e6;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);

    /* 便利機能 */
    position: sticky;   /* スクロールで固定 */
    top: 20px;
    height: fit-content;
}

.blog-sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-sidebar li {
    margin-bottom: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid #dee2e6;
}

.blog-sidebar li:last-child {
    border-bottom: none;
}

.blog-sidebar a {
    color: #333;
    text-decoration: none;
    display: block;
    font-weight: 500;
}

.blog-sidebar a:hover {
    color: #007bff;
}

.blog-sidebar small {
    display: block;
    margin-top: 0.25rem;
    color: #6c757d;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .blog-container {
        grid-template-columns: 1fr; /* スマホは1カラム */
    }
    .blog-sidebar {
        position: static;  /* スマホでは固定を解除 */
        top: auto;
        border-left: none;
        box-shadow: none;  /* 影を弱めて軽く */
    }
}