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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }

        header {
            background: linear-gradient(135deg, #00728e 0%, #005a70 100%);
            color: #fff;
            padding: 2rem 0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

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

        nav {
            background-color: #fff;
            border-bottom: 3px solid #00728e;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        }

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

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

        nav ul li {
            margin: 0;
        }

        nav ul li a {
            display: block;
            padding: 1rem 1.5rem;
            color: #00728e;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }

        nav ul li a:hover {
            background-color: #f2f2f2;
        }

        main {
            max-width: 1000px;
            margin: 3rem auto;
            padding: 0 20px;
        }

        h1 {
            font-size: 2.5rem;
            color: #00728e;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid #00728e;
        }

        article {
            background-color: #fff;
            padding: 2.5rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(0, 114, 142, 0.1);
        }

        article h2 {
            color: #00728e;
            font-size: 1.8rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }

        article h3 {
            color: #00728e;
            font-size: 1.4rem;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }

        article h4 {
            color: #00728e;
            font-size: 1.2rem;
            margin-top: 1.2rem;
            margin-bottom: 0.6rem;
        }

        article p {
            margin-bottom: 1.2rem;
            color: #333;
            line-height: 1.8;
        }

        article strong {
            color: #00728e;
            font-weight: 600;
        }

        article hr {
            border: none;
            border-top: 1px solid #e6e6e6;
            margin: 1.5rem 0;
        }

        .transition-section {
            background-color: #fff;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(0, 114, 142, 0.1);
        }

        .transition-section p {
            margin-bottom: 1rem;
            line-height: 1.8;
        }

        .links-section {
            background-color: #fff;
            padding: 2.5rem;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(0, 114, 142, 0.1);
            margin-bottom: 3rem;
        }

        .links-section h2 {
            color: #00728e;
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid rgba(0, 114, 142, 0.2);
        }

        .links-section h3 {
            color: #00728e;
            font-size: 1.3rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.8rem;
            margin-bottom: 2rem;
        }

        .links-section ul li {
            padding: 0;
        }

        .links-section ul li a {
            color: #00728e;
            text-decoration: none;
            padding: 0.5rem 0;
            display: block;
            transition: color 0.3s ease, padding-left 0.3s ease;
        }

        .links-section ul li a:before {
            content: "→ ";
            margin-right: 0.5rem;
        }

        .links-section ul li a:hover {
            color: #005a70;
            padding-left: 0.5rem;
        }

        footer {
            background-color: #f2f2f2;
            border-top: 1px solid #e6e6e6;
            padding: 2rem 0;
            margin-top: 4rem;
        }

        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
            color: #666;
            font-size: 0.9rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }

            article {
                padding: 1.5rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li a {
                padding: 0.8rem 1rem;
            }

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

            .links-section {
                padding: 1.5rem;
            }

            .transition-section {
                padding: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.6rem;
            }

            article {
                padding: 1rem;
            }

            .links-section {
                padding: 1rem;
            }

            .transition-section {
                padding: 1rem;
            }
        }