/* カテゴリ絞り込みフィルター */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2rem;
}

.tag-btn {
    background-color: transparent;
    color: var(--text-sub);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-base);
}

    .tag-btn:hover {
        color: var(--primary-color);
        border-color: var(--primary-color);
    }

    .tag-btn.active {
        background-color: rgba(0, 243, 255, 0.1);
        color: var(--primary-color);
        border-color: var(--primary-color);
        box-shadow: 0 0 10px rgba(0, 243, 255, 0.3);
    }

/* カテゴリタグ (カード＆詳細ページ用) */
.category-tag {
    display: inline-block;
    background-color: var(--primary-color);
    color: #070913;
    padding: 4px 8px; 
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    font-family: var(--font-base);
    letter-spacing: 1px;
    line-height: 1;
}

.detail-tag {
    font-size: 0.9rem;
    padding: 6px 12px;
}

/* Column 一覧ページ用 */
.column-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Column 詳細ページ用 */
.article-container {
    max-width: 900px;
    margin: 2rem auto;
}

.article-meta-top {
    display: flex;
    align-items: center; 
    gap: 15px;
    margin-bottom: 1rem;
}

.article-date {
    color: var(--text-sub);
    font-weight: bold;
    letter-spacing: 1px;
    font-family: var(--font-cyber);
    line-height: 1;
    margin: 0;
}

.article-title {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    line-height: 1.4;
    font-family: var(--font-base);
    font-weight: 700;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.article-inner-eyecatch {
    width: 100%;
    height: auto;
    display: block;
    margin: 0 0 2rem 0;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.article-share-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 2rem;
}

.share-x-btn {
    display: inline-flex;
    align-items: center;
    color: var(--text-main);
    background-color: transparent;
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.2s ease;
}

    .share-x-btn:hover {
        background-color: rgba(255, 255, 255, 0.05);
        border-color: var(--text-main);
        color: var(--text-main);
        box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
    }

.article-body {
    max-width: 880px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-main);
    word-break: break-word;
}

    .article-body img {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        margin: 1.5rem 0;
    }

    .article-body p {
        margin: 0 0 1.5rem 0;
        font-family: var(--font-base);
    }

    .article-body h2, .article-body h3, .article-body h4 {
        font-family: var(--font-base);
        font-weight: 700;
        letter-spacing: 0.05em;
        margin-top: 2.5rem;
        margin-bottom: 1rem;
        color: var(--text-main);
        border-left: 4px solid var(--primary-color);
        padding-left: 10px;
    }

    .article-body pre, .article-body code {
        background-color: var(--bg-panel);
        padding: 4px 8px;
        border-radius: 4px;
        border: 1px solid var(--border-color);
    }