/* ================================================
   PRODUS コラムページ CSS
   コーポレートサイトのモノクロデザインシステムに準拠
   ================================================ */

/* ========================================
   記事一覧ページ
   ======================================== */

.content-section {
    padding: 100px 0;
}

/* カード一覧 */
.column-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.column-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

/* 個別カード */
.column-card {
    display: flex;
    gap: 30px;
    padding: 40px 0;
    border-bottom: 1px solid var(--color-gray-mid);
    transition: all 0.3s ease;
}

.column-card:hover {
    transform: translateX(5px);
}

/* サムネイル */
.column-card-thumbnail {
    flex-shrink: 0;
    width: 240px;
    height: 160px;
    overflow: hidden;
    border: 1px solid var(--color-black);
}

.column-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.column-card:hover .column-card-thumbnail img {
    transform: scale(1.05);
}

/* カード本文 */
.column-card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.column-card-date {
    font-size: 0.8rem;
    color: var(--color-gray-dark);
    letter-spacing: 0.1em;
    font-weight: 400;
    margin-bottom: 8px;
}

.column-card-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: 12px;
    line-height: 1.5;
    letter-spacing: 0.02em;
}

.column-card-description {
    font-size: 0.95rem;
    color: var(--color-gray-dark);
    line-height: 1.8;
    font-weight: 300;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 空状態 */
.column-empty {
    text-align: center;
    color: var(--color-gray-dark);
    font-size: 1.1rem;
    padding: 80px 0;
    font-weight: 300;
}

/* ========================================
   ページネーション
   ======================================== */

.column-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 80px;
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-black);
    background: var(--color-white);
    border: 1px solid var(--color-black);
    text-decoration: none;
    transition: all 0.3s ease;
}

.pagination-link:hover {
    background: var(--color-black);
    color: var(--color-white);
}

.pagination-current {
    background: var(--color-black);
    color: var(--color-white);
}

/* ========================================
   個別記事ページ
   ======================================== */

.column-article {
    padding: 100px 0 60px;
}

.column-article-header {
    max-width: 800px;
    margin: 0 auto 60px;
    text-align: center;
}

.column-article-header time {
    font-size: 0.85rem;
    color: var(--color-gray-dark);
    letter-spacing: 0.15em;
    font-weight: 400;
}

.column-article-header h1 {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-black);
    margin-top: 20px;
    line-height: 1.5;
    letter-spacing: 0.02em;
}

/* 記事本文（Markdownレンダリング） */
.column-article-body {
    max-width: 800px;
    margin: 0 auto;
}

.column-article-body h2 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-black);
    margin: 60px 0 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--color-black);
}

.column-article-body h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-black);
    margin: 40px 0 20px;
}

.column-article-body h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-black);
    margin: 30px 0 15px;
}

.column-article-body p {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--color-black);
    font-weight: 300;
    margin-bottom: 25px;
}

.column-article-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 40px auto;
    border: 1px solid var(--color-gray-mid);
}

.column-article-body a {
    color: var(--color-black);
    text-decoration: underline;
    font-weight: 400;
    transition: opacity 0.3s ease;
}

.column-article-body a:hover {
    opacity: 0.6;
}

.column-article-body blockquote {
    border-left: 4px solid var(--color-black);
    padding: 20px 25px;
    margin: 40px 0;
    background: var(--color-gray-light);
    font-style: normal;
}

.column-article-body blockquote p {
    margin-bottom: 0;
    color: var(--color-gray-dark);
}

.column-article-body code {
    background: var(--color-gray-light);
    padding: 2px 6px;
    font-size: 0.9em;
    border: 1px solid var(--color-gray-mid);
}

.column-article-body pre {
    background: var(--color-black);
    color: var(--color-white);
    padding: 25px;
    overflow-x: auto;
    margin: 40px 0;
    line-height: 1.6;
}

.column-article-body pre code {
    background: none;
    padding: 0;
    border: none;
    color: inherit;
    font-size: 0.9rem;
}

.column-article-body ul,
.column-article-body ol {
    margin: 25px 0;
    padding-left: 25px;
}

.column-article-body li {
    font-size: 1.05rem;
    line-height: 2;
    font-weight: 300;
    margin-bottom: 8px;
}

.column-article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 40px 0;
}

.column-article-body th {
    background: var(--color-black);
    color: var(--color-white);
    font-weight: 700;
    padding: 12px 15px;
    text-align: left;
}

.column-article-body td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--color-gray-mid);
    font-weight: 300;
}

.column-article-body hr {
    border: none;
    border-top: 1px solid var(--color-gray-mid);
    margin: 60px 0;
}

/* 記事フッター（一覧に戻るボタン） */
.column-article-footer {
    max-width: 800px;
    margin: 80px auto 0;
    text-align: center;
}

/* 404ページ */
.column-not-found {
    text-align: center;
    padding: 80px 0;
}

.column-not-found p {
    color: var(--color-gray-dark);
    font-size: 1.1rem;
    font-weight: 300;
    margin-bottom: 40px;
}

/* ========================================
   レスポンシブ
   ======================================== */

@media screen and (max-width: 768px) {
    .content-section {
        padding: 80px 0;
    }

    .column-card {
        flex-direction: column;
        gap: 20px;
        padding: 30px 0;
    }

    .column-card-thumbnail {
        width: 100%;
        height: 200px;
    }

    .column-article-header h1 {
        font-size: 1.8rem;
    }

    .column-article-body h2 {
        font-size: 1.5rem;
    }

    .column-article {
        padding: 80px 0 40px;
    }
}

@media screen and (max-width: 480px) {
    .column-card-thumbnail {
        height: 180px;
    }

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

    .column-pagination {
        flex-wrap: wrap;
    }
}