* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
            padding: 5px 0;
            display: flex;
            justify-content: center;
        }
        
        .container {
            width: 100%;
            max-width: 800px;
            background-color: white;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            margin: 0 20px;
        }
        
        /* ヘッダー部分 */
        .header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 30px 25px;
            text-align: center;
            position: relative;
        }
        
        .header h1 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            font-weight: 700;
            line-height: 1.4;
        }
        
        .header .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .icon-large {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: #FFD700;
        }
        
        /* メインコンテンツ */
        .content {
            padding: 30px 25px;
        }
        
        .section {
            margin-bottom: 35px;
        }
        
        .section-title {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f0f0f0;
            color: #1a237e;
            font-size: 1.4rem;
        }
        
        .section-title i {
            margin-right: 12px;
            background-color: #e8eaf6;
            padding: 10px;
            border-radius: 50%;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .highlight-box {
            background-color: #f3f4ff;
            border-left: 0px solid #3949ab;
            padding: 20px;
            border-radius: 0 8px 8px 0;
            margin: 25px 0;
        }
        
        .highlight-box p {
            margin-bottom: 0;
            font-size: 1.05rem;
        }
        
        .highlight-box strong {
            color: #1a237e;
        }
        
        .check-list {
            list-style-type: none;
            margin: 20px 0;
        }
        
        .check-list li {
            padding: 10px 0 10px 35px;
            position: relative;
        }
        
        .check-list li:before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 10px;
            width: 24px;
            height: 24px;
            background-color: #4CAF50;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 25px;
        }
        
        .feature-item {
            background-color: #f9f9ff;
            padding: 20px;
            border-radius: 10px;
            border: 1px solid #e0e0ff;
        }
        
        .feature-item h3 {
            color: #1a237e;
            margin-bottom: 10px;
            font-size: 1.2rem;
        }
        
        .feature-item i {
            color: #3949ab;
            margin-bottom: 15px;
            font-size: 1.5rem;
        }
        
        /* CTAセクション */
        .cta-section {
            background: linear-gradient(135deg, #3949ab 0%, #283593 100%);
            color: white;
            padding: 35px 25px;
            text-align: center;
            border-radius: 12px;
            margin-top: 30px;
        }
        
        .cta-section h2 {
            font-size: 1.7rem;
            margin-bottom: 15px;
        }
        
        .cta-button {
            display: inline-block;
            background-color: #FFD700;
            color: #1a237e;
            padding: 18px 40px;
            font-size: 1.2rem;
            font-weight: bold;
            border-radius: 50px;
            text-decoration: none;
            margin-top: 25px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
        }
        
        .cta-button:hover {
            background-color: #ffed4e;
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(255, 215, 0, 0.4);
        }
        
        .cta-button i {
            margin-right: 10px;
        }
        
        /* フッター */
        .footer {
            text-align: center;
            padding: 25px;
            color: #666;
            font-size: 0.9rem;
            border-top: 1px solid #eee;
        }
        
        /* レスポンシブ調整 */
        @media (max-width: 600px) {
            .header h1 {
                font-size: 1.5rem;
            }
            
            .header .subtitle {
                font-size: 1rem;
            }
            
            .content {
                padding: 25px 20px;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .cta-section h2 {
                font-size: 1.4rem;
            }
            
            .cta-button {
                padding: 16px 30px;
                font-size: 1.1rem;
                width: 90%;
            }
        }
        
        @media (max-width: 400px) {
            .header, .content, .cta-section {
                padding-left: 15px;
                padding-right: 15px;
            }
            
            .section-title {
                font-size: 1.2rem;
            }
        }