:root {
            --primary-color: #4b1212;
            --accent-color: #e10909;
            --text-color: #333;
            --bg-light: #f4f4f4;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic Pro", Meiryo, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            margin: 0;
            padding: 0;
        }

        #wrapper { max-width: 960px; margin: 0 auto; padding: 20px; }

        header { border-bottom: 3px solid var(--primary-color); padding-bottom: 20px; display: flex; flex-direction: column; align-items: center; }
        .logo { width: 145px; height: auto; }
        
        #gnavi ul { display: flex; list-style: none; padding: 0; gap: 10px; flex-wrap: wrap; justify-content: center; }
        #gnavi a { text-decoration: none; color: var(--primary-color); font-weight: bold; padding: 10px; border: 1px solid #ccc; display: block; }

        #mainvisual { position: relative; margin: 20px 0; overflow: hidden; border-bottom: 10px solid var(--primary-color); }
        .kanban-img { width: 100%; height: auto; object-fit: cover; }

        #innerwrapper { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; margin-top: 30px; }
        
        section { background: var(--bg-light); padding: 15px; border-radius: 8px; }
        h3 img { width: 100%; height: auto; max-width: 250px; }
        .in10 { margin: 15px 0; }
        
        .thumbnail img { width: 100%; height: auto; border: 4px solid #fff; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
        
        footer { margin-top: 50px; padding: 20px; text-align: center; border-top: 1px solid #ccc; font-size: 0.9em; }
        .nav-menu { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; }
        
        @media (max-width: 768px) {
            #innerwrapper { grid-template-columns: 1fr; }
        }