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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: #2c2c2c;
            background-color: #ffffff;
        }

        header {
            background-color: #ffffff;
            border-bottom: 1px solid #e8e8e8;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.2rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            color: #2c2c2c;
            text-decoration: none;
        }

        nav ul {
            list-style: none;
            display: flex;
            gap: 2rem;
            align-items: center;
        }

        nav a {
            color: #2c2c2c;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        nav a:hover {
            color: #666;
        }

        main {
            max-width: 900px;
            margin: 0 auto;
            padding: 3rem 2rem;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 400;
            margin-bottom: 2rem;
            color: #2c2c2c;
            letter-spacing: -0.5px;
        }

        article {
            margin-bottom: 3rem;
        }

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

        article h3 {
            font-size: 1.4rem;
            font-weight: 400;
            margin: 1.5rem 0 1rem;
            color: #2c2c2c;
        }

        article h4 {
            font-size: 1.2rem;
            font-weight: 500;
            margin: 1.2rem 0 0.8rem;
            color: #2c2c2c;
        }

        article p {
            margin-bottom: 1.2rem;
            color: #555;
            font-size: 1rem;
            line-height: 1.8;
        }

        article ul,
        article ol {
            margin-bottom: 1.2rem;
            padding-left: 2rem;
            color: #555;
        }

        article li {
            margin-bottom: 0.5rem;
        }

        .transition-section {
            margin: 3rem 0;
            padding: 2rem 0;
            border-top: 1px solid #e8e8e8;
        }

        .transition-section p {
            color: #555;
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 1.2rem;
        }

        .links-section {
            background-color: #fafafa;
            padding: 3rem 2rem;
            margin: 3rem -2rem 0;
        }

        .links-container {
            max-width: 900px;
            margin: 0 auto;
        }

        .links-section h3 {
            font-size: 1.3rem;
            font-weight: 500;
            margin-bottom: 1rem;
            color: #2c2c2c;
        }

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

        .links-section li {
            margin-bottom: 0.7rem;
            break-inside: avoid;
        }

        .links-section a {
            color: #2c2c2c;
            text-decoration: none;
            font-size: 0.95rem;
            border-bottom: 1px solid transparent;
            transition: border-color 0.3s;
            display: inline-block;
            line-height: 1.6;
        }

        .links-section a:hover {
            border-bottom-color: #2c2c2c;
        }

        footer {
            background-color: #2c2c2c;
            color: #ffffff;
            padding: 3rem 2rem 2rem;
            margin-top: 4rem;
        }

        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .footer-section h4 {
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: #ffffff;
        }

        .footer-section p,
        .footer-section a {
            font-size: 0.85rem;
            color: #cccccc;
            line-height: 1.8;
            text-decoration: none;
        }

        .footer-section a:hover {
            color: #ffffff;
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-direction: column;
                gap: 1rem;
            }

            nav ul {
                flex-wrap: wrap;
                gap: 1rem;
                justify-content: center;
            }

            h1 {
                font-size: 2rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

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

            main {
                padding: 2rem 1.5rem;
            }

            .links-section {
                margin: 3rem -1.5rem 0;
                padding: 2rem 1.5rem;
            }
        }

        @media (max-width: 480px) {
            nav ul {
                gap: 0.8rem;
                font-size: 0.85rem;
            }

            h1 {
                font-size: 1.7rem;
            }
        }