* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            max-width: 120rem;
            margin: 0 auto;
            padding: 0 1rem;
        }
        h1, h2, h3, h4 { color: #1a5276; margin-bottom: 1rem; font-weight: 700; }
        h1 { font-size: 2.8rem; margin-top: 2rem; border-bottom: 4px solid #3498db; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; margin-top: 3rem; padding-left: 0.5rem; border-left: 5px solid #2ecc71; }
        h3 { font-size: 1.8rem; margin-top: 2.5rem; color: #2874a6; }
        h4 { font-size: 1.5rem; margin-top: 2rem; color: #5499c7; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        a { color: #2980b9; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; text-decoration: underline; }
        strong { color: #2c3e50; }
        em { font-style: italic; color: #7d3c98; }
        .container { display: grid; grid-template-columns: 1fr; gap: 2rem; }
        main { grid-column: 1; }
        header {
            background: linear-gradient(to right, #1b4f72, #3498db);
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 1rem 1rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            margin-bottom: 2rem;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.8rem;
            font-weight: 900;
            color: #fff;
            text-decoration: none;
            text-shadow: 3px 3px 0 #154360;
            font-family: 'Arial Black', sans-serif;
            letter-spacing: 1px;
        }
        .my-logo:hover { color: #aed6f1; text-decoration: none; }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 0.5rem;
        }
        .desktop-nav a:hover { background-color: rgba(255, 255, 255, 0.2); }
        .hamburger {
            display: none;
            font-size: 2rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: #2c3e50;
            width: 100%;
            margin-top: 1rem;
            border-radius: 0.5rem;
            overflow: hidden;
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav a {
            color: white;
            padding: 1rem;
            border-bottom: 1px solid #34495e;
        }
        .mobile-nav a:hover { background-color: #1a252f; }
        .breadcrumb {
            padding: 1rem;
            background-color: #eaf2f8;
            border-radius: 0.5rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 0.75rem;
            color: #7f8c8d;
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: 1rem;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 2rem;
        }
        .intro-box {
            background: #e8f4fc;
            border-left: 5px solid #3498db;
            padding: 1.5rem;
            margin-bottom: 2.5rem;
            border-radius: 0 0.5rem 0.5rem 0;
        }
        .featured-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 1rem;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 16px rgba(52, 152, 219, 0.3);
        }
        .search-box {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 1rem;
            margin: 3rem 0;
            text-align: center;
            border: 2px dashed #3498db;
        }
        .search-box form {
            display: flex;
            max-width: 600px;
            margin: 1rem auto 0;
        }
        .search-box input {
            flex-grow: 1;
            padding: 1rem;
            border: 2px solid #3498db;
            border-radius: 0.5rem 0 0 0.5rem;
            font-size: 1rem;
        }
        .search-box button {
            background: #3498db;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 0.5rem 0.5rem 0;
            cursor: pointer;
            font-size: 1.2rem;
        }
        .search-box button:hover { background: #2980b9; }
        .user-feedback {
            background: linear-gradient(145deg, #ffffff, #f0f8ff);
            padding: 2.5rem;
            border-radius: 1rem;
            margin: 3rem 0;
            border: 1px solid #d1e7ff;
        }
        .rating-widget {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .star-rating { display: flex; gap: 0.5rem; }
        .star-rating i {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating i:hover,
        .star-rating i.active { color: #f39c12; }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #bdc3c7;
            border-radius: 0.5rem;
            margin: 1rem 0;
            font-family: inherit;
            resize: vertical;
            min-height: 120px;
        }
        .submit-btn {
            background: linear-gradient(to right, #27ae60, #2ecc71);
            color: white;
            padding: 0.8rem 2rem;
            border: none;
            border-radius: 0.5rem;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.2s;
        }
        .submit-btn:hover { transform: translateY(-3px); }
        footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 1rem;
            border-radius: 1rem 1rem 0 0;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-links h3 { color: #3498db; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #bdc3c7; }
        .footer-links a:hover { color: #3498db; }
        friend-link {
            display: block;
            padding: 1rem;
            background: #34495e;
            border-radius: 0.5rem;
            margin: 1rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #4a6572;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .header-content { flex-direction: column; align-items: flex-start; }
            .desktop-nav { display: none; }
            .hamburger { display: block; align-self: flex-end; margin-top: -3rem; }
            .article-content { padding: 1.5rem; }
            .footer-content { grid-template-columns: 1fr; }
        }
        .text-center { text-align: center; }
        .mt-3 { margin-top: 3rem; }
        .mb-3 { margin-bottom: 3rem; }
        .last-updated {
            font-style: italic;
            color: #7f8c8d;
            background: #f8f9fa;
            padding: 0.5rem 1rem;
            border-radius: 0.5rem;
            display: inline-block;
            margin: 1rem 0;
        }