* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            line-height: 1.8;
            color: #333;
            background: #f8f8f8;
        }
        
        .header {
            background: white;
            padding: 40px 20px;
            text-align: center;
            border-bottom: 1px solid #e0e0e0;
        }
        
        .header h1 {
            font-size: 2.5em;
            margin-bottom: 15px;
            font-weight: 600;
            color: #333;
        }
        
        .header p {
            font-size: 1.1em;
            color: #666;
            max-width: 900px;
            margin: 0 auto;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .section-header {
            background: #dc143c;
            color: white;
            padding: 12px 30px;
            border-radius: 8px;
            display: inline-block;
            font-size: 1.3em;
            font-weight: 600;
            margin: 40px 0 30px 0;
            box-shadow: 0 4px 12px rgba(220, 20, 60, 0.3);
        }
        
        .section {
            background: white;
            margin: 30px 0 60px 0;
            padding: 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
        }
        
        .section-content {
            padding: 10px;
        }
        
        .two-column {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            align-items: center;
        }
        
        .image-container {
            width: 100%;
            height: 100%;
            min-height: 100px;
            background: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2em;
            position: relative;
            overflow: hidden;
        }
        
        .image-container::before {
            content: '';
            position: absolute;
            width: 200%;
            height: 200%;
            background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
            animation: shimmer 3s infinite;
        }
        
        @keyframes shimmer {
            0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
            100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
        }
        
        .text-container {
            padding: 20px;
        }
        
        .text-container h3 {
            font-size: 1.8em;
            margin-bottom: 25px;
            color: #333;
            font-weight: 600;
        }
        
        .text-container p {
            font-size: 1.05em;
            line-height: 1.9;
            color: #555;
            margin-bottom: 15px;
        }
        
        .notice-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 5px 20px;
            margin-top: 10px;
            border-radius: 4px;
            color: #856404;
        }
        
        .view-more-btn {
            display: inline-block;
            background: #2c3e50;
            color: white;
            padding: 12px 30px;
            border-radius: 25px;
            text-decoration: none;
            margin-top: 20px;
            transition: all 0.3s;
            font-size: 0.95em;
        }
        
        .view-more-btn:hover {
            background: #34495e;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
            padding: 40px;
        }
        
        .feature-card {
            padding: 30px;
            background: #f8f9fa;
            border-radius: 8px;
            border-left: 4px solid #dc143c;
            transition: all 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .feature-card h4 {
            color: #dc143c;
            font-size: 1.3em;
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        .feature-card p {
            color: #555;
            line-height: 1.8;
        }
        
        .use-cases-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            padding: 20px;
        }
        
        .use-case {
            padding: 20px;
            background: #f8f9fa;
            border-radius: 8px;
            border-top: 3px solid #dc143c;
        }
        
        .use-case h4 {
            color: #dc143c;
            margin-bottom: 10px;
            font-size: 1.3em;
            font-weight: 600;
        }
        
        .use-case ul {
            list-style: none;
            padding-left: 0;
        }
        
        .use-case li {
            padding: 8px 0;
            color: #555;
            position: relative;
            padding-left: 20px;
        }
        
        .use-case li:before {
            content: "●";
            color: #dc143c;
            font-size: 0.8em;
            position: absolute;
            left: 0;
        }
        
        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            padding: 40px;
        }
        
        .benefit-card {
            padding: 20px;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 12px;
            border-left: 5px solid #dc143c;
        }
        
        .benefit-icon {
            font-size: 3em;
            margin-bottom: 10px;
            color: #dc143c;
        }
        
        .benefit-card h3 {
            color: #333;
            margin-bottom: 15px;
            font-size: 1.5em;
            font-weight: 600;
        }
        
        .benefit-card p {
            color: #555;
            line-height: 1.8;
        }
        
        .specs-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        
        .specs-table th,
        .specs-table td {
            padding: 18px;
            text-align: left;
            border-bottom: 1px solid #e0e0e0;
        }
        
        .specs-table th {
            background: #f8f9fa;
            color: #333;
            font-weight: 600;
            width: 200px;
        }
        
        .specs-table td {
            color: #555;
        }
        
        .specs-table tr:hover {
            background: #f8f9fa;
        }
        
        .video-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 25px;
            padding: 40px;
        }
        
        .video-card {
            background: white;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s;
            text-decoration: none;
            color: #333;
            display: block;
        }
        
        .video-card:hover {
            border-color: #dc143c;
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .video-card strong {
            display: block;
            color: #dc143c;
            font-size: 1.2em;
            margin-bottom: 12px;
        }
        
        .video-card span {
            color: #999;
            font-size: 0.95em;
        }
        
        .diagram-placeholder {
            background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
            border: 2px dashed #1e88e5;
            border-radius: 8px;
            padding: 15px;
            text-align: center;
            margin: 30px 0;
            color: #1565c0;
            font-size: 1.2em;
            font-weight: 600;
        }
        
        .key-concepts {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
            padding: 20px;
        }
        
        .concept-card {
            background: white;
            border: 2px solid #1e88e5;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }
        
        .concept-icon {
            font-size: 3em;
            margin-bottom: 15px;
            color: #1e88e5;
        }
        
        .concept-card h4 {
            color: #1565c0;
            margin-bottom: 15px;
            font-size: 1.2em;
        }
        
        .concept-card p {
            color: #555;
            font-size: 0.95em;
        }
        
        .cta-section {
            background: white;
            border-top: 1px solid #e0e0e0;
            padding: 50px 20px;
            text-align: center;
            margin-top: 60px;
        }
        
        .cta-section h2 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.8em;
        }
        
        .cta-section p {
            font-size: 1.1em;
            color: #666;
            margin-bottom: 30px;
        }
        
        .cta-button {
            display: inline-block;
            background: #dc143c;
            color: white;
            padding: 15px 40px;
            border-radius: 30px;
            text-decoration: none;
            font-size: 1.1em;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .cta-button:hover {
            background: #b01030;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(220, 20, 60, 0.4);
        }
        
        @media (max-width: 1024px) {
            .two-column {
                grid-template-columns: 1fr;
            }
            
            .features-grid,
            .key-concepts {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .use-cases-grid,
            .video-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .features-grid,
            .use-cases-grid,
            .benefits-grid,
            .video-grid,
            .key-concepts {
                grid-template-columns: 1fr;
            }
            
            .text-container {
                padding: 30px;
            }
            
            .section-content {
                padding: 25px;
            }
        }
                /* スタイル3: 3Dブロック積層 */
        .building-blocks-3 {
            width: 150px;
            height: 150px;
            margin: 0 auto;
            position: relative;
            perspective: 1000px;
        }
        
        .cube {
            position: absolute;
            width: 60px;
            height: 60px;
            transform-style: preserve-3d;
            animation: rotate3d 8s linear infinite;
        }
        
        .cube-1 {
            bottom: 20px;
            left: 45px;
        }
        
        .cube-2 {
            bottom: 65px;
            left: 25px;
            animation-delay: -2s;
        }
        
        .cube-3 {
            bottom: 65px;
            right: 25px;
            animation-delay: -4s;
        }
        
        @keyframes rotate3d {
            from { transform: rotateY(0deg); }
            to { transform: rotateY(360deg); }
        }
        
        .cube-face {
            position: absolute;
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%);
            border: 2px solid rgba(255,255,255,0.3);
            opacity: 0.9;
        }
        
        .cube-face.front  { transform: translateZ(30px); }
        .cube-face.back   { transform: translateZ(-30px) rotateY(180deg); }
        .cube-face.right  { transform: rotateY(90deg) translateZ(30px); }
        .cube-face.left   { transform: rotateY(-90deg) translateZ(30px); }
        .cube-face.top    { transform: rotateX(90deg) translateZ(30px); }
        .cube-face.bottom { transform: rotateX(-90deg) translateZ(30px); }