* {
            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: #333;
            background: #fff;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        h1 {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: 50px;
            font-weight: 400;
            color: #000;
        }

        /* Three columns section */
        .three-columns {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            margin-bottom: 60px;
        }

        .column h2 {
            font-size: 1.1rem;
            margin-bottom: 15px;
            font-weight: 600;
            color: #000;
        }

        .column h2 span {
            color: #0066cc;
            cursor: pointer;
        }

        .column p {
            font-size: 0.95rem;
            text-align: justify;
            line-height: 1.7;
            color: #333;
        }

        /* Main content section */
        .main-section {
            margin-bottom: 50px;
        }

        .main-section h2 {
            font-size: 1.5rem;
            text-align: center;
            margin-bottom: 25px;
            font-weight: 400;
            color: #000;
        }

        .main-section p {
            font-size: 0.95rem;
            text-align: justify;
            line-height: 1.8;
            margin-bottom: 20px;
            color: #333;
        }

        /* Lists section */
        .lists-section {
            margin: 60px 0;
        }

        .lists-section h2 {
            font-size: 1.5rem;
            text-align: center;
            margin-bottom: 40px;
            font-weight: 400;
            color: #000;
        }

        .lists-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 60px;
        }

        .list-column ul {
            list-style: none;
        }

        .list-column li {
            font-size: 0.9rem;
            margin-bottom: 8px;
            color: #333;
            position: relative;
            padding-left: 15px;
        }

        .list-column li:before {
            content: "•";
            position: absolute;
            left: 0;
            color: #000;
            font-weight: bold;
        }

        /* Image grid */
        .image-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin: 60px 0;
        }

        .image-box {
            width: 100%;
            height: 300px;
            overflow: hidden;
            border-radius: 4px;
        }

        .image-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Footer */
        .footer {
            text-align: center;
            margin-top: 60px;
            padding: 30px 0;
            border-top: 1px solid #eee;
        }

        .footer a {
            color: #0066cc;
            text-decoration: none;
            font-size: 0.95rem;
        }

        .footer a:hover {
            text-decoration: underline;
        }

        /* Responsive */
        @media (max-width: 900px) {
            .three-columns,
            .lists-container {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .image-grid {
                grid-template-columns: 1fr;
            }

            h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 600px) {
            .container {
                padding: 20px 15px;
            }

            h1 {
                font-size: 1.8rem;
                margin-bottom: 30px;
            }

            .column h2,
            .main-section h2,
            .lists-section h2 {
                font-size: 1.2rem;
            }
        }