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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #ffffff;
            color: #333;
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        header {
            background-color: #f8f8f8;
            border-bottom: 3px solid #e0e0e0;
            padding: 2rem 1rem;
            text-align: center;
        }

        h1 {
            font-size: 2.5rem;
            color: #2c2c2c;
            font-weight: 300;
            letter-spacing: 2px;
            margin-bottom: 0.5rem;
        }

        nav {
            background-color: #fff;
            border-bottom: 1px solid #e0e0e0;
            padding: 0.8rem 1rem;
            text-align: center;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }

        nav a {
            color: #555;
            text-decoration: none;
            padding: 0.5rem 1.2rem;
            display: inline-block;
            font-size: 0.95rem;
            transition: color 0.3s ease;
        }

        nav a:hover {
            color: #000;
        }

        nav a:not(:last-child)::after {
            content: '/';
            margin-left: 1.2rem;
            color: #ccc;
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 3rem 1.5rem;
            flex: 1;
        }

        article {
            margin-bottom: 3rem;
        }

        article p {
            margin-bottom: 1.2rem;
            color: #444;
            font-size: 1.05rem;
        }

        article h2 {
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            color: #2c2c2c;
            font-weight: 400;
        }

        article h3 {
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
            color: #3c3c3c;
            font-weight: 400;
        }

        article b,
        article strong {
            color: #1a1a1a;
            font-weight: 600;
        }

        .transition-section {
            margin: 3rem 0;
            padding: 2rem;
            background-color: #fafafa;
            border-left: 4px solid #d0d0d0;
        }

        .transition-section p {
            color: #555;
            font-size: 1.05rem;
            line-height: 1.7;
        }

        .links-section {
            margin-top: 3rem;
            padding: 2.5rem;
            background-color: #f5f5f5;
            border-radius: 4px;
            border: 1px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 1.4rem;
            margin-bottom: 1rem;
            color: #2c2c2c;
            font-weight: 400;
            border-bottom: 2px solid #d0d0d0;
            padding-bottom: 0.5rem;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 2.5rem;
            margin-bottom: 2rem;
        }

        .links-section li {
            break-inside: avoid;
            margin-bottom: 0.6rem;
            padding-left: 1.2rem;
            position: relative;
        }

        .links-section li::before {
            content: '→';
            position: absolute;
            left: 0;
            color: #888;
        }

        .links-section a {
            color: #555;
            text-decoration: none;
            transition: color 0.3s ease;
            font-size: 0.98rem;
        }

        .links-section a:hover {
            color: #000;
            text-decoration: underline;
        }

        footer {
            background-color: #2c2c2c;
            color: #aaa;
            text-align: center;
            padding: 1.5rem 1rem;
            margin-top: auto;
            border-top: 3px solid #1a1a1a;
        }

        footer a {
            color: #aaa;
            text-decoration: none;
            padding: 0 0.8rem;
            transition: color 0.3s ease;
        }

        footer a:hover {
            color: #fff;
        }

        footer a:not(:last-child)::after {
            content: '/';
            margin-left: 0.8rem;
            color: #666;
        }

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

            nav a {
                padding: 0.4rem 0.6rem;
                font-size: 0.9rem;
            }

            nav a:not(:last-child)::after {
                margin-left: 0.6rem;
            }

            main {
                padding: 2rem 1rem;
            }

            .links-section ul {
                column-count: 1;
            }

            .transition-section {
                padding: 1.5rem;
            }

            .links-section {
                padding: 1.5rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }
        }

        @media (max-width: 480px) {
            header {
                padding: 1.5rem 0.5rem;
            }

            h1 {
                font-size: 1.6rem;
                letter-spacing: 1px;
            }

            nav {
                padding: 0.5rem;
            }

            nav a {
                display: block;
                padding: 0.5rem;
                border-bottom: 1px solid #f0f0f0;
            }

            nav a:not(:last-child)::after {
                content: '';
                margin: 0;
            }

            footer a {
                display: block;
                padding: 0.3rem;
            }

            footer a:not(:last-child)::after {
                content: '';
                margin: 0;
            }
        }