* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --text-color: #333;
            --light-text: #7f8c8d;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--text-color);
            background-color: #f9f9f9;
            font-size: 1.05rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            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: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo:hover {
            color: var(--secondary-color);
        }
        .logo i {
            color: var(--accent-color);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .nav-links a:hover,
        .nav-links a.active {
            background-color: var(--secondary-color);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: var(--light-color);
            margin-bottom: 2rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: var(--light-text);
        }
        .breadcrumb a {
            color: var(--secondary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin-bottom: 3rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            box-shadow: var(--box-shadow);
        }
        aside {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--box-shadow);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            line-height: 1.3;
        }
        h2 {
            font-size: 2rem;
            color: var(--dark-color);
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light-color);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--accent-color);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            color: var(--primary-color);
            font-weight: 600;
            padding: 1rem;
            background-color: #f0f8ff;
            border-left: 4px solid var(--secondary-color);
            border-radius: var(--border-radius);
        }
        .highlight {
            background-color: #fffacd;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        em {
            color: var(--accent-color);
            font-style: italic;
        }
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            transition: var(--transition);
        }
        .featured-image:hover {
            transform: scale(1.01);
            box-shadow: 0 12px 25px rgba(0,0,0,0.2);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--light-text);
            margin-top: -1.5rem;
            margin-bottom: 2rem;
        }
        .interactive-box {
            background: #f8f9fa;
            border: 2px dashed #dee2e6;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin: 2.5rem 0;
            transition: var(--transition);
        }
        .interactive-box:hover {
            border-color: var(--secondary-color);
            background: #f0f7ff;
        }
        .search-form, .comment-form, .rating-form {
            margin-bottom: 2.5rem;
            padding: 1.5rem;
            background: #f8f9fa;
            border-radius: var(--border-radius);
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, select, textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        button, .btn {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            display: inline-block;
            text-decoration: none;
        }
        button:hover, .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .btn-accent {
            background-color: var(--accent-color);
        }
        .btn-accent:hover {
            background-color: #c0392b;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            color: #ddd;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #f39c12;
        }
        .footer-links {
            background: var(--dark-color);
            padding: 3rem 0 2rem;
            margin-top: 3rem;
        }
        .web-link {
            display: inline-block;
            margin: 0.5rem 1rem 0.5rem 0;
            padding: 0.5rem 1rem;
            background: rgba(255,255,255,0.1);
            border-radius: 50px;
            transition: var(--transition);
        }
        .web-link:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .web-link a {
            color: white;
            text-decoration: none;
        }
        footer {
            background-color: #1a252f;
            color: #bdc3c7;
            padding: 2.5rem 0;
            text-align: center;
        }
        .copyright {
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: var(--primary-color);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            }
            .nav-links.active {
                display: flex;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            article, aside {
                padding: 1.5rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mb-3 { margin-bottom: 3rem; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .mt-3 { margin-top: 3rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .hidden { display: none; }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
        th, td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid #eee;
        }
        th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }
        tr:hover {
            background-color: #f9f9f9;
        }
        blockquote {
            border-left: 4px solid var(--secondary-color);
            padding: 1.5rem 2rem;
            margin: 2rem 0;
            background-color: #f8f9fa;
            font-style: italic;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        blockquote p {
            margin-bottom: 0.5rem;
        }
        blockquote footer {
            background: none;
            color: var(--light-text);
            padding: 0;
            text-align: right;
            font-size: 0.9rem;
            font-style: normal;
        }
        .tabs {
            margin: 2rem 0;
        }
        .tab-headers {
            display: flex;
            border-bottom: 2px solid #eee;
            margin-bottom: 1.5rem;
        }
        .tab-header {
            padding: 0.8rem 1.5rem;
            cursor: pointer;
            font-weight: 600;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }
        .tab-header.active {
            color: var(--secondary-color);
            border-bottom-color: var(--secondary-color);
        }
        .tab-content {
            display: none;
            padding: 1.5rem 0;
        }
        .tab-content.active {
            display: block;
        }
        .progress-container {
            margin: 2rem 0;
        }
        .progress-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }
        .progress-bar {
            height: 10px;
            background-color: #eee;
            border-radius: 5px;
            overflow: hidden;
        }
        .progress-fill {
            height: 100%;
            background-color: var(--secondary-color);
            border-radius: 5px;
            width: 0;
            transition: width 1s ease;
        }