/* コラム INDEX・記事ページ共通 */

.column-page,
.article-page {
    padding: calc(80px + 2rem) 0 3rem 0;
    min-height: 100vh;
    background-color: var(--light-gray);
}

.column-content,
.article-content {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    line-height: 1.8;
}

.back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

.column-content h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 2rem;
    line-height: 1.4;
}

.column-intro {
    margin-bottom: 2rem;
    color: var(--dark-gray);
}

.column-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.column-item {
    border: 1px solid #e9ecef;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    transition: box-shadow 0.2s ease;
}

.column-item:hover {
    box-shadow: var(--box-shadow);
}

.column-item a {
    display: block;
    padding: 1.25rem 1.5rem;
    text-decoration: none;
    color: inherit;
}

.column-item-header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.column-item-number {
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray);
    letter-spacing: 0.02em;
}

.column-item-title {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.column-item-desc {
    margin: 0;
    font-size: 0.95rem;
    color: var(--dark-gray);
}

.article-author-profile {
    background-color: var(--base-color);
    border-radius: var(--border-radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
}

.article-author-profile h2 {
    font-size: 1rem;
    color: var(--primary-color);
    margin: 0 0 0.75rem 0;
    padding: 0;
    border: none;
}

.article-author-profile p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--dark-gray);
}

.article-author-profile strong {
    color: var(--primary-color);
}

.article-content h1 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    line-height: 1.4;
}

.article-content h2 {
    color: var(--primary-color);
    margin: 2.5rem 0 1rem 0;
    font-size: 1.35rem;
    line-height: 1.4;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--base-color);
}

.article-content p {
    margin-bottom: 1rem;
}

.article-content ul {
    margin: 0 0 1rem 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-table-wrapper {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.article-table th,
.article-table td {
    padding: 0.875rem 1rem;
    border: 1px solid #e9ecef;
    text-align: left;
    vertical-align: top;
}

.article-table thead th {
    background-color: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

.article-table tbody td:first-child {
    background-color: var(--light-gray);
    color: var(--primary-color);
    font-weight: 500;
    width: 28%;
}

.article-table tbody td:first-child a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.article-table tbody td:first-child a:hover {
    text-decoration: underline;
}

.article-cta {
    margin-top: 2.5rem;
    padding: 1.5rem;
    background-color: var(--base-color);
    border-radius: var(--border-radius);
    text-align: center;
}

.article-cta p {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 500;
}

.logo a {
    color: inherit;
    text-decoration: none;
}

@media (max-width: 768px) {
    .column-content,
    .article-content {
        padding: 1.5rem;
    }

    .column-content h1,
    .article-content h1 {
        font-size: 1.5rem;
    }

    .article-content h2 {
        font-size: 1.15rem;
    }

    .article-table {
        font-size: 0.85rem;
    }

    .article-table th,
    .article-table td {
        padding: 0.625rem 0.5rem;
    }
}

/* 記事ページ: 本文 + サイドバー */
.column-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 2rem;
    align-items: start;
    width: 100%;
}

.column-layout .article-content {
    min-width: 0;
    max-width: none;
    margin: 0;
}

.column-sidebar {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.25rem 1.5rem;
    position: sticky;
    top: calc(80px + 1.5rem);
}

.column-sidebar-title {
    font-size: 1rem;
    color: var(--primary-color);
    margin: 0 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--base-color);
}

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

.column-sidebar-item {
    margin-bottom: 0.75rem;
}

.column-sidebar-item:last-child {
    margin-bottom: 0;
}

.column-sidebar-item a {
    display: flex;
    gap: 0.5rem;
    align-items: baseline;
    text-decoration: none;
    color: inherit;
    line-height: 1.5;
}

.column-sidebar-item a:hover .column-sidebar-text {
    text-decoration: underline;
}

.column-sidebar-number {
    flex-shrink: 0;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray);
}

.column-sidebar-text {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 500;
}

.column-sidebar-item.is-current .column-sidebar-text {
    font-weight: 700;
}

.column-sidebar-item.is-current .column-sidebar-number {
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .column-layout {
        grid-template-columns: 1fr;
    }

    .column-sidebar {
        width: 100%;
        position: static;
    }
}