:root {
            --primary: #1a365d;
            --secondary: #e53e3e;
            --accent: #f6ad55;
            --light: #f7fafc;
            --dark: #2d3748;
            --gray: #a0aec0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
            line-height: 1.6;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 1rem 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--secondary);
            text-decoration: none;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .my-logo:hover {
            text-shadow: 0 2px 5px rgba(0,0,0,0.2);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
            transition: var(--transition);
            font-size: 1rem;
        }
        nav a:hover, nav a.active {
            background-color: var(--primary);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--primary);
            cursor: pointer;
        }
        .search-container {
            margin: 2rem auto;
            max-width: 600px;
        }
        .search-form {
            display: flex;
            box-shadow: var(--shadow);
            border-radius: 50px;
            overflow: hidden;
        }
        .search-form input {
            flex: 1;
            padding: 15px 20px;
            border: none;
            font-size: 1rem;
        }
        .search-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: #c53030;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        article {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        h1 {
            color: var(--primary);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid var(--accent);
            padding-bottom: 10px;
        }
        h2 {
            color: var(--primary);
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            padding-left: 10px;
            border-left: 5px solid var(--secondary);
        }
        h3 {
            color: var(--dark);
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            color: #4a5568;
            font-size: 1.1rem;
            margin: 1rem 0 0.5rem;
        }
        p {
            margin-bottom: 1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            color: var(--dark);
            background: #edf2f7;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            text-decoration: underline;
            color: #c53030;
        }
        .keyword {
            background: #fffaf0;
            padding: 0 4px;
            border-radius: 3px;
            font-weight: 600;
        }
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 1.5rem 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: -10px;
            margin-bottom: 1.5rem;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            box-shadow: 0 0 10px rgba(0,0,0,0.05);
        }
        th, td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        th {
            background-color: var(--primary);
            color: white;
        }
        tr:hover {
            background-color: #f5f5f5;
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .card {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
        }
        .card:hover {
            transform: translateY(-5px);
        }
        .card-title {
            color: var(--primary);
            margin-bottom: 0.8rem;
            font-size: 1.3rem;
        }
        .btn {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 12px 24px;
            border-radius: 6px;
            border: none;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
            min-height: 44px;
            min-width: 44px;
        }
        .btn:hover {
            background: #c53030;
            text-decoration: none;
            transform: scale(1.05);
        }
        .btn-primary {
            background: var(--primary);
        }
        .btn-primary:hover {
            background: #2c5282;
        }
        .comment-section, .rating-section {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .rating-stars {
            color: var(--accent);
            font-size: 1.5rem;
            margin: 10px 0;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 1rem;
        }
        input, textarea, select {
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
        }
        .social-share {
            display: flex;
            gap: 1rem;
            margin: 2rem 0;
            justify-content: center;
        }
        .social-btn {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .social-btn.facebook { background: #3b5998; }
        .social-btn.twitter { background: #1da1f2; }
        .social-btn.reddit { background: #ff4500; }
        .social-btn:hover {
            transform: scale(1.1);
        }
        .to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        footer {
            background: var(--primary);
            color: white;
            padding: 3rem 1rem;
            margin-top: 3rem;
            border-radius: 10px 10px 0 0;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
        }
        .friend-link {
            display: block;
            color: var(--accent);
            margin-bottom: 0.8rem;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        .update-info {
            background: #e6fffa;
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 4px solid #38b2ac;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            nav ul {
                display: none;
                width: 100%;
                flex-direction: column;
                margin-top: 1rem;
                gap: 0;
            }
            nav ul.active {
                display: flex;
            }
            nav a {
                display: block;
                padding: 12px 15px;
                border-bottom: 1px solid #eee;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                flex-direction: column;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 10px;
            }
            article, aside {
                padding: 1.5rem 1rem;
            }
            h1 {
                font-size: 1.8rem;
            }
        }