body {
            font-family: 'Arial', sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background-color: #f5f5f5;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        header {
            position: fixed;
            top: 0;
            width: 100%;
            height: 80px;
            background-color: #333;
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
            z-index: 1000;
            box-sizing: border-box;
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background-color: #333;
            color: white;
        }

        h1 {
            width: 250px;
            margin: 0;
            font-size: 1.8rem;
        }

        /* ハンバーガーメニューボタン */
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            padding: 5px;
            margin-right: 15px;
        }

        /* メニューとソーシャルアイコンのコンテナ */
        .menu-social-container {
            display: flex;
            align-items: center;
        }

        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: white;
            margin: 3px 0;
            transition: 0.3s;
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(-45deg) translate(-7px, 6px);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: rotate(45deg) translate(-7px, -6px);
        }

        nav ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            display: flex;
        }

        nav ul li {
            margin: 0 20px;
        }

        nav ul li a {
            display: flex;
            justify-content: center;
            align-items: center;
            color: white;
            text-decoration: none;
            padding: 10px;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }

        nav ul li a:hover {
            background-color: #0ff;
            color: black;
        }

        /* ソーシャルアイコンのスタイル */
        .social-icons {
            display: flex;
            gap: 15px;
        }

        .social-link {
            color: white;
            font-size: 1.5rem;
            transition: color 0.3s ease, transform 0.3s ease;
        }

        .social-link:hover {
            color: #1DA1F2;
            transform: scale(1.2);
        }

        .social-link:nth-child(2):hover {
            color: #E1306C;
        }

        /* モバイルメニュー用のスタイル */
        .mobile-nav {
            position: fixed;
            top: 80px;
            left: -100%;
            width: 100%;
            height: calc(100vh - 80px);
            background-color: #333;
            transition: left 0.3s ease;
            z-index: 999;
            display: none;
        }

        .mobile-nav.active {
            left: 0;
        }

        .mobile-nav ul {
            list-style-type: none;
            margin: 0;
            padding: 20px 0;
            display: flex;
            flex-direction: column;
            height: 100%;
            justify-content: flex-start;
        }

        .mobile-nav ul li {
            margin: 10px 0;
            width: 100%;
            text-align: center;
        }

        .mobile-nav ul li a {
            display: block;
            color: white;
            text-decoration: none;
            padding: 15px;
            font-size: 1.2rem;
            width: 100%;
            transition: background-color 0.3s ease;
        }

        .mobile-nav ul li a:hover {
            background-color: #0ff;
            color: black;
        }

        /* メインコンテンツ */
        .top_text {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            margin-top: 100px;
            padding: 40px 20px;
            text-align: center;
            background-color: white;
            margin: 100px 20px 20px 20px;
            border-radius: 15px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        }

        .contact-message {
            font-size: 1.2rem;
            color: #333;
            margin-bottom: 30px;
            line-height: 1.8;
        }

        .contact-message a {
            color: #007BFF;
            text-decoration: none;
            font-weight: bold;
            padding: 8px 16px;
            border-radius: 25px;
            background: linear-gradient(135deg, #007BFF, #0056b3);
            color: white;
            transition: all 0.3s ease;
            display: inline-block;
            margin: 0 5px;
        }

        .contact-message a:hover {
            background: linear-gradient(135deg, #0056b3, #004085);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
        }

        .top_text img {
            max-width: 100%;
            width: 500px;
            height: auto;
            border-radius: 15px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
            margin-top: 20px;
            transition: transform 0.3s ease;
        }

        .top_text img:hover {
            transform: scale(1.02);
        }

        /* 装飾的な要素 */
        .contact-container {
            position: relative;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            padding: 40px;
            border-radius: 20px;
            margin: 20px;
        }

        .contact-container::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: linear-gradient(45deg, #007BFF, #0ff, #007BFF);
            border-radius: 22px;
            z-index: -1;
            opacity: 0.1;
        }

        footer {
            width: 100%;
            background-color: #333;
            text-align: center;
            color: #f0f0f0;
            padding: 20px 0;
            margin-top: auto;
        }

        /* レスポンシブデザイン */
        @media screen and (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            /* デスクトップ用のnavを非表示 */
            nav {
                display: none;
            }

            /* モバイルナビを表示 */
            .mobile-nav {
                display: block;
            }

            h1 {
                font-size: 1.2rem;
                width: auto;
            }

            .social-icons {
                gap: 10px;
            }

            .social-link {
                font-size: 1.3rem;
            }

            .top_text {
                margin: 90px 15px 15px 15px;
                padding: 30px 20px;
            }

            .contact-message {
                font-size: 1.1rem;
            }

            .contact-container {
                margin: 10px;
                padding: 25px;
            }

            .top_text img {
                width: 100%;
                max-width: 400px;
            }
        }

        @media screen and (max-width: 480px) {
            header {
                padding: 0 15px;
                height: 70px;
            }

            h1 {
                font-size: 1rem;
            }

            .top_text {
                margin: 80px 10px 10px 10px;
                padding: 20px 15px;
            }

            .contact-message {
                font-size: 1rem;
                margin-bottom: 20px;
            }

            .contact-message a {
                padding: 6px 12px;
                font-size: 0.9rem;
                margin: 5px 2px;
                display: inline-block;
            }

            .contact-container {
                margin: 5px;
                padding: 20px;
            }

            .top_text img {
                width: 100%;
                max-width: 300px;
            }

            .mobile-nav {
                top: 70px;
                height: calc(100vh - 70px);
            }

            footer {
                padding: 15px 0;
                font-size: 0.9rem;
            }
        }