* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 40px 0;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            margin-bottom: 40px;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            text-align: center;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
            margin: 0;
            padding: 0 20px;
        }

        article {
            background: white;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        article h2 {
            color: #667eea;
            font-size: 1.8rem;
            margin-top: 30px;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 3px solid #667eea;
        }

        article h2:first-child {
            margin-top: 0;
        }

        article h3 {
            color: #764ba2;
            font-size: 1.4rem;
            margin-top: 25px;
            margin-bottom: 12px;
        }

        article h4 {
            color: #555;
            font-size: 1.2rem;
            margin-top: 20px;
            margin-bottom: 10px;
        }

        article p {
            margin-bottom: 20px;
            font-size: 1.05rem;
            text-align: justify;
        }

        .transition-section {
            background: white;
            padding: 35px 40px;
            margin-bottom: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            border-left: 5px solid #667eea;
        }

        .transition-section p {
            font-size: 1.05rem;
            margin-bottom: 15px;
            line-height: 1.8;
        }

        .transition-section p:last-child {
            margin-bottom: 0;
        }

        .links-section {
            background: white;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 40px;
        }

        .links-section h3 {
            color: #667eea;
            font-size: 1.6rem;
            margin-top: 35px;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid #e0e0e0;
        }

        .links-section h3:first-child {
            margin-top: 0;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px 30px;
            margin-bottom: 20px;
        }

        .links-section li {
            padding: 0;
        }

        .links-section a {
            color: #764ba2;
            text-decoration: none;
            font-size: 1.05rem;
            transition: all 0.3s ease;
            display: inline-block;
            position: relative;
            padding-left: 20px;
        }

        .links-section a:before {
            content: "▸";
            position: absolute;
            left: 0;
            color: #667eea;
            transition: transform 0.3s ease;
        }

        .links-section a:hover {
            color: #667eea;
            transform: translateX(5px);
        }

        .links-section a:hover:before {
            transform: translateX(5px);
        }

        footer {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-align: center;
            padding: 25px 20px;
            margin-top: 60px;
            box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
        }

        footer p {
            margin: 0;
            font-size: 0.95rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
                padding: 0 15px;
            }

            header {
                padding: 30px 0;
                margin-bottom: 30px;
            }

            article {
                padding: 25px 20px;
                margin-bottom: 30px;
            }

            article h2 {
                font-size: 1.5rem;
                margin-top: 25px;
            }

            article h3 {
                font-size: 1.25rem;
                margin-top: 20px;
            }

            article h4 {
                font-size: 1.1rem;
            }

            article p {
                font-size: 1rem;
            }

            .transition-section {
                padding: 25px 20px;
                margin-bottom: 30px;
            }

            .transition-section p {
                font-size: 1rem;
            }

            .links-section {
                padding: 25px 20px;
                margin-bottom: 30px;
            }

            .links-section h3 {
                font-size: 1.4rem;
                margin-top: 30px;
                margin-bottom: 15px;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .links-section a {
                font-size: 1rem;
            }

            footer {
                margin-top: 40px;
                padding: 20px 15px;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.5rem;
            }

            article {
                padding: 20px 15px;
            }

            article h2 {
                font-size: 1.3rem;
            }

            article h3 {
                font-size: 1.15rem;
            }

            .links-section {
                padding: 20px 15px;
            }

            .links-section h3 {
                font-size: 1.25rem;
            }

            .transition-section {
                padding: 20px 15px;
            }
        }