:root {
            --primary-color: #00739c;
            --accent-color: #00d082;
            --text-color: #333;
            --bg-color: #f4f4f4;
        }
        * { box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif; margin: 0; color: var(--text-color); background: var(--bg-color); line-height: 1.6; }
        
        header { background: #fff; padding: 2rem 1rem; text-align: center; border-bottom: 3px solid var(--primary-color); }
        .sitename a { font-size: 1.5rem; font-weight: bold; color: var(--primary-color); text-decoration: none; }
        
        .gnav nav { margin-top: 1rem; }
        .gnav ul { list-style: none; padding: 0; display: flex; justify-content: center; gap: 20px; }
        .gnav a { color: var(--primary-color); font-weight: bold; }

        .content-inner { max-width: 1000px; margin: 0 auto; padding: 1rem; }
        
        .post_by_category_slider { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; margin-top: 2rem; }
        
        .article { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 6px rgba(0,0,0,0.1); transition: transform 0.2s; }
        .article:hover { transform: translateY(-5px); }
        .thumb { width: 100%; height: 200px; background: linear-gradient(135deg, #00739c, #00d082); display: flex; align-items: center; justify-content: center; color: white; margin: 0; }
        .thumb::after { content: 'naoyu.net'; font-weight: bold; }
        
        .body { padding: 1rem; }
        .entry-title { font-size: 1.1rem; font-weight: bold; margin: 0 0 0.5rem; color: #000; }
        .meta_category { display: inline-block; background: var(--primary-color); color: #fff; padding: 2px 8px; font-size: 0.8rem; margin-bottom: 0.5rem; }
        
        footer { margin-top: 3rem; padding: 2rem; background: #000; color: #fff; text-align: center; }

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