/* ========================================
   カテゴリカラー
======================================== */
:root {
    --category-no1: #2563eb;
    --category-business: #059669;
    --category-law: #dc2626;
}

/* ========================================
   カテゴリタブ
======================================== */
.category-tabs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
}

.category-tab {
    padding: 12px 24px;
    border: 1px solid var(--border-color);
    background: #fff;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 500;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.category-tab:hover,
.category-tab.active {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: #fff;
    border-color: transparent;
}

/* ========================================
   コラム一覧
======================================== */
.columns-section {
    padding: 60px 0;
}

.column-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.column-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.column-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(10, 18, 60, 0.12);
}

.column-card-image {
    height: 180px;
    overflow: hidden;
}

.column-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.column-card-body {
    padding: 24px;
}

.column-card-category {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 3px;
    margin-bottom: 12px;
}

.column-card-category.no1 {
    background: rgba(37, 99, 235, 0.1);
    color: var(--category-no1);
}

.column-card-category.business {
    background: rgba(5, 150, 105, 0.1);
    color: var(--category-business);
}

.column-card-category.law {
    background: rgba(220, 38, 38, 0.1);
    color: var(--category-law);
}

.column-card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.column-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--accent-gray);
}

.column-card-meta .icon {
    width: 14px;
    height: 14px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
}

.column-card-meta .icon img {
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

/* ========================================
   レスポンシブ
======================================== */
@media (max-width: 991px) {
    .column-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .column-grid {
        grid-template-columns: 1fr;
    }
}