:root {
            --primary-color: #2c3e50;
            --secondary-color: #e74c3c;
            --accent-color: #3498db;
            --light-bg: #f8f9fa;
            --dark-text: #2c3e50;
            --light-text: #7f8c8d;
            --border-color: #dee2e6;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: #fff;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        nav a:hover, nav a.active {
            background-color: var(--secondary-color);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        article {
            background-color: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        aside {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid var(--secondary-color);
        }
        h2 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--dark-text);
            margin: 1.5rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--light-text);
            margin: 1rem 0 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--primary-color);
            margin-bottom: 2rem;
            padding: 1rem;
            background-color: var(--light-bg);
            border-left: 4px solid var(--accent-color);
        }
        .article-img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-img:hover {
            transform: scale(1.01);
        }
        .float-right {
            float: right;
            width: 50%;
            margin: 0 0 1rem 1.5rem;
        }
        @media (max-width: 768px) {
            .float-right {
                float: none;
                width: 100%;
                margin: 1rem 0;
            }
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        th {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem;
            text-align: left;
        }
        td {
            padding: 0.8rem 1rem;
            border-bottom: 1px solid var(--border-color);
        }
        tr:hover {
            background-color: var(--light-bg);
        }
        .btn {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            background-color: var(--accent-color);
            color: white;
            text-decoration: none;
            border-radius: 4px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            font-size: 1rem;
            min-height: 44px;
            min-width: 44px;
        }
        .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
        }
        .btn-danger {
            background-color: var(--secondary-color);
        }
        .btn-danger:hover {
            background-color: #c0392b;
        }
        .btn-success {
            background-color: #27ae60;
        }
        .btn-success:hover {
            background-color: #219653;
        }
        .search-box {
            margin: 1.5rem 0;
            display: flex;
            gap: 0;
        }
        .search-box input {
            flex: 1;
            padding: 0.9rem 1rem;
            border: 2px solid var(--border-color);
            border-right: none;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
        }
        .search-box button {
            border-radius: 0 4px 4px 0;
            padding: 0 1.5rem;
        }
        form {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid var(--border-color);
            border-radius: 4px;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent-color);
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating-stars {
            color: #f1c40f;
            font-size: 1.5rem;
        }
        .social-share {
            display: flex;
            gap: 1rem;
            margin: 2rem 0;
            justify-content: center;
        }
        .social-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            color: white;
            text-decoration: none;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .facebook { background-color: #3b5998; }
        .twitter { background-color: #1da1f2; }
        .reddit { background-color: #ff4500; }
        .whatsapp { background-color: #25d366; }
        .social-btn:hover {
            transform: translateY(-3px);
            opacity: 0.9;
        }
        #backToTop {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            cursor: pointer;
            display: none;
            font-size: 1.5rem;
            z-index: 999;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        #backToTop:hover {
            background-color: #c0392b;
        }
        .info-box {
            background-color: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .info-box h3 {
            margin-top: 0;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        .info-box ul {
            list-style-position: inside;
            padding-left: 0.5rem;
        }
        .info-box li {
            margin-bottom: 0.5rem;
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
            border-radius: 8px 8px 0 0;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
        }
        friend-link a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            html {
                font-size: 14px;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            nav {
                width: 100%;
                margin-top: 1rem;
                display: none;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 0.5rem;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            article, aside {
                padding: 1.5rem 1rem;
            }
            .social-share {
                flex-wrap: wrap;
            }
        }
        .text-center { text-align: center; }
        .text-right { text-align: right; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .p-1 { padding: 1rem; }
        .bg-light { background-color: var(--light-bg); }
        .rounded { border-radius: 8px; }
        .highlight { background-color: #fff3cd; padding: 0.2rem 0.5rem; border-radius: 4px; }
        .badge {
            display: inline-block;
            padding: 0.2rem 0.6rem;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .toc {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .toc h2 {
            margin-top: 0;
            font-size: 1.3rem;
        }
        .toc ul {
            list-style-type: none;
            padding-left: 1rem;
        }
        .toc li {
            margin-bottom: 0.5rem;
        }
        .toc a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .toc a:hover {
            text-decoration: underline;
        }