/*
==================================================
コラム一覧ページ
==================================================
*/

/* ヘッダー部分 */
.column_header {
    background: url('../../images/archive-cover.jpg') no-repeat center center;
    background-size: cover;
    color: #fff;
    text-align: left;
    padding: 70px 0;
    height: 200px;
    display: flex;
    align-items: center;
    position: relative;
    margin-top: 70px; /* ヘッダーの高さ分を追加 */
}

.column_header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to right,
        rgba(26, 0, 176, 0.9) 0%,
        rgba(0, 82, 176, 0.7) 50%,
        rgba(0, 153, 176, 0.5) 100%
    );
    z-index: 1;
}

.column_header .container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.column_header .title {
    font-size: 36px;
    line-height: 1.2;
    margin-bottom: 15px;
    font-weight: bold;
    letter-spacing: 0.05em;
    text-align: left;
    padding-left: 80px;
    display: block;
}

.column_header p {
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    opacity: 0.9;
    text-align: left;
    padding-left: 80px;
    display: block;
}

/* パンくずリスト */
.breadcrumbs {
    background-color: #ffffff;
    font-size: 0.8rem;
    padding: 15px 0;
    margin-bottom: 30px;
}

.breadcrumbs .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.breadcrumbs a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumbs a:hover {
    color: #0099B0;
}

.breadcrumbs-item,
.breadcrumbs-separator {
    display: inline;
    padding: 0 5px;
}

.breadcrumbs-separator {
    color: #666;
}

/* コンテンツ部分 */
.archive-column {
    padding: 40px 0;
}

.single-news-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.archive-column-list-wrap {
    margin-bottom: 40px;
}

.archive-column-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.archive-column-item {
    background: #f7f5f4;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.archive-column-image {
    position: relative;
    padding-top: 66.67%; /* 3:2のアスペクト比 */
    overflow: hidden;
}

.archive-column-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.archive-column-date {
    color: #888;
    font-size: 11px;
    margin: 15px 20px 5px;
}

.archive-column-title {
    font-size: 16px;
    margin: 0 20px 20px;
    line-height: 1.4;
}

.archive-column-title a {
    color: #333;
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.archive-column-title a:hover {
    color: #0099B0;
}

/* レスポンシブ対応 */
@media (max-width: 1024px) {
    .archive-column-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .column_header {
        padding: 50px 0;
    }

    .column_header .title {
        font-size: 28px;
        padding-left: 20px;
    }

    .column_header p {
        font-size: 14px;
        padding-left: 20px;
    }

    .archive-column {
        padding: 30px 0;
    }

    .single-news-container {
        padding: 0 15px;
    }

    .archive-column-list {
        gap: 20px;
    }

    .archive-column-title {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .column_header {
        margin-top: 60px; /* ヘッダーの高さ分を追加 */
    }

    .archive-column-list {
        grid-template-columns: 1fr;
    }

    .column_header .title {
        font-size: 24px;
        padding-left: 15px;
    }

    .column_header p {
        padding-left: 15px;
    }

    .archive-column {
        padding: 20px 0;
    }
}