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

        body {
            background-color: #D3D3D3;
            font-family: Verdana, Arial, Helvetica, sans-serif;
            color: #333;
            line-height: 1.6;
        }

        .container {
            max-width: 780px;
            margin: 20px auto;
            background-color: #EFEFEF;
            border: 1px solid #333333;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        header {
            background-color: #EFEFEF;
            border-bottom: 1px solid #999999;
        }

        .header-image {
            width: 100%;
            height: auto;
            display: block;
            background: linear-gradient(135deg, #BCC5A7 0%, #DADFCE 100%);
            padding: 40px 20px;
            text-align: center;
        }

        .header-image h1 {
            color: #333333;
            font-size: 2em;
            font-weight: bold;
            text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
        }

        main {
            display: flex;
            flex-wrap: wrap;
        }

        .sidebar {
            background-color: #DADFCE;
            width: 180px;
            padding: 20px 15px;
            border-right: 1px solid #999999;
        }

        .sidebar-button {
            margin-bottom: 20px;
        }

        .sidebar-button img {
            width: 100%;
            height: auto;
            display: block;
        }

        .content {
            flex: 1;
            padding: 30px 25px;
            background-color: #EFEFEF;
            min-width: 0;
        }

        h1 {
            font-size: 1.8em;
            color: #333333;
            margin-bottom: 25px;
            font-weight: bold;
            line-height: 1.3;
        }

        article {
            margin-bottom: 30px;
        }

        article p {
            margin-bottom: 15px;
            font-size: 12px;
            color: #333;
            text-align: justify;
        }

        article h2 {
            font-size: 1.4em;
            color: #333333;
            margin: 25px 0 15px;
            font-weight: bold;
        }

        article h3 {
            font-size: 1.2em;
            color: #333333;
            margin: 20px 0 12px;
            font-weight: bold;
        }

        .transition-content {
            background-color: #F1F2EE;
            padding: 20px;
            margin: 25px 0;
            border-left: 4px solid #BCC5A7;
            font-size: 12px;
        }

        .transition-content p {
            margin-bottom: 12px;
        }

        .links-section {
            background-color: #FFFFFF;
            padding: 30px 25px;
            margin-top: 30px;
            border-top: 2px solid #BCC5A7;
            border-radius: 4px;
        }

        .links-section h3 {
            font-size: 1.3em;
            color: #333333;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #DADFCE;
            font-weight: bold;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 30px;
            margin-bottom: 25px;
        }

        .links-section li {
            margin-bottom: 10px;
            break-inside: avoid;
            page-break-inside: avoid;
        }

        .links-section a {
            color: #4a6b3c;
            text-decoration: none;
            font-size: 13px;
            display: inline-block;
            padding: 5px 0;
            transition: color 0.3s ease;
        }

        .links-section a:hover {
            color: #2d4225;
            text-decoration: underline;
        }

        .links-section a::before {
            content: "▸ ";
            color: #BCC5A7;
            margin-right: 5px;
        }

        footer {
            background-color: #EFEFEF;
            border-top: 1px solid #999999;
            padding: 20px;
            text-align: center;
        }

        footer p {
            font-size: 11px;
            color: #666;
        }

        @media (max-width: 768px) {
            .container {
                margin: 10px;
                border: none;
            }

            main {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                border-right: none;
                border-bottom: 1px solid #999999;
                display: flex;
                justify-content: center;
                flex-wrap: wrap;
                gap: 15px;
            }

            .sidebar-button {
                margin: 0;
                max-width: 200px;
            }

            .content {
                padding: 20px 15px;
            }

            .header-image h1 {
                font-size: 1.5em;
            }

            h1 {
                font-size: 1.5em;
            }

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

            .links-section {
                padding: 20px 15px;
            }
        }

        @media (max-width: 480px) {
            .header-image {
                padding: 25px 15px;
            }

            .header-image h1 {
                font-size: 1.3em;
            }

            h1 {
                font-size: 1.3em;
            }

            article p,
            .transition-content {
                font-size: 11px;
            }

            .links-section a {
                font-size: 12px;
            }
        }