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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
        }

        #page {
            max-width: 1200px;
            margin: 0 auto;
            background-color: #fff;
            box-shadow: 0 0 20px rgba(0,0,0,0.1);
        }

        #header {
            background-color: #2c3e50;
            color: #fff;
            padding: 20px 30px;
            border-bottom: 4px solid #e74c3c;
        }

        #header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        #logo-title h1 {
            font-size: 24px;
            font-weight: 600;
            color: #fff;
            margin: 0;
        }

        #navbar {
            background-color: #34495e;
            border-bottom: 2px solid #e74c3c;
        }

        #navbar-inner {
            padding: 0;
        }

        .sf-menu {
            list-style: none;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            padding: 0;
            margin: 0;
        }

        .sf-menu > li {
            position: relative;
        }

        .sf-menu > li > a {
            display: block;
            padding: 18px 25px;
            color: #fff;
            text-decoration: none;
            font-weight: 500;
            transition: background-color 0.3s ease;
        }

        .sf-menu > li > a:hover {
            background-color: #2c3e50;
            color: #e74c3c;
        }

        #main {
            padding: 40px 30px;
            background-color: #fff;
        }

        h1 {
            font-size: 36px;
            color: #2c3e50;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px solid #e74c3c;
        }

        article {
            background-color: #fff;
            padding: 30px 0;
            margin-bottom: 40px;
        }

        article h2 {
            font-size: 28px;
            color: #34495e;
            margin-top: 30px;
            margin-bottom: 15px;
        }

        article h3 {
            font-size: 22px;
            color: #34495e;
            margin-top: 25px;
            margin-bottom: 12px;
        }

        article h4 {
            font-size: 18px;
            color: #34495e;
            margin-top: 20px;
            margin-bottom: 10px;
        }

        article p {
            margin-bottom: 20px;
            line-height: 1.8;
            color: #555;
        }

        article ul, article ol {
            margin-bottom: 20px;
            padding-left: 30px;
        }

        article li {
            margin-bottom: 10px;
            line-height: 1.7;
        }

        #transition-section {
            background-color: #ecf0f1;
            padding: 30px;
            margin: 40px 0;
            border-left: 4px solid #e74c3c;
        }

        #transition-section p {
            color: #555;
            line-height: 1.8;
            margin-bottom: 15px;
        }

        #links-section {
            background-color: #f8f9fa;
            padding: 40px 30px;
            margin-top: 40px;
            border-top: 3px solid #e74c3c;
        }

        #links-section h3 {
            font-size: 24px;
            color: #2c3e50;
            margin-bottom: 20px;
            margin-top: 30px;
        }

        #links-section h3:first-child {
            margin-top: 0;
        }

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

        #links-section li {
            margin-bottom: 12px;
            break-inside: avoid;
        }

        #links-section a {
            color: #e74c3c;
            text-decoration: none;
            transition: color 0.3s ease;
            display: inline-block;
            padding: 5px 0;
        }

        #links-section a:hover {
            color: #c0392b;
            text-decoration: underline;
        }

        #links-section a::before {
            content: "→ ";
            margin-right: 5px;
        }

        #footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 30px;
            text-align: center;
            border-top: 4px solid #e74c3c;
        }

        #footer p {
            margin: 10px 0;
            font-size: 14px;
        }

        #footer-menu {
            list-style: none;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 20px;
        }

        #footer-menu a {
            color: #ecf0f1;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s ease;
        }

        #footer-menu a:hover {
            color: #e74c3c;
        }

        @media (max-width: 768px) {
            #header-inner {
                flex-direction: column;
                text-align: center;
            }

            #logo-title h1 {
                font-size: 20px;
                margin-bottom: 10px;
            }

            .sf-menu {
                flex-direction: column;
                align-items: stretch;
            }

            .sf-menu > li > a {
                padding: 15px 20px;
                text-align: center;
            }

            #main {
                padding: 30px 20px;
            }

            h1 {
                font-size: 28px;
            }

            article h2 {
                font-size: 24px;
            }

            article h3 {
                font-size: 20px;
            }

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

            #transition-section {
                padding: 20px;
            }

            #links-section {
                padding: 30px 20px;
            }

            #footer-menu {
                flex-direction: column;
                gap: 10px;
            }
        }

        @media (max-width: 480px) {
            body {
                font-size: 14px;
            }

            h1 {
                font-size: 24px;
            }

            article h2 {
                font-size: 20px;
            }

            article h3 {
                font-size: 18px;
            }

            .sf-menu > li > a {
                padding: 12px 15px;
                font-size: 14px;
            }
        }