:root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #f39c12;
            --light: #ecf0f1;
            --dark: #1a2530;
            --gray: #7f8c8d;
            --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;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f9f9f9;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        .container {
            width: 100%;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 100%);
            color: var(--light);
            padding: 1.5rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: var(--accent);
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .logo span {
            color: var(--light);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav ul li a {
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            position: relative;
        }
        nav ul li a:hover, nav ul li a.active {
            color: var(--accent);
            background-color: rgba(255,255,255,0.1);
        }
        nav ul li a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--accent);
            left: 50%;
            bottom: 0;
            transition: var(--transition);
        }
        nav ul li a:hover::after {
            width: 80%;
            left: 10%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--accent);
        }
        .search-box {
            display: flex;
            align-items: center;
            background: rgba(255,255,255,0.15);
            border-radius: 30px;
            padding: 0.5rem 1rem;
            margin-top: 1rem;
            width: 100%;
            order: 3;
        }
        .search-box input {
            flex: 1;
            background: transparent;
            border: none;
            outline: none;
            color: var(--light);
            padding: 0.5rem;
        }
        .search-box button {
            background: transparent;
            border: none;
            color: var(--accent);
            cursor: pointer;
            font-size: 1.2rem;
        }
        .search-box input::placeholder {
            color: rgba(255,255,255,0.7);
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--gray);
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        .breadcrumb i {
            margin: 0 0.5rem;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 3rem 0;
            background-color: white;
        }
        .content {
            padding-right: 2rem;
        }
        article {
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--accent);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--secondary);
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #eee;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--primary);
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--dark);
            background: #f8f9fa;
            padding: 1.5rem;
            border-left: 5px solid var(--accent);
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fffde7;
            padding: 2rem;
            border-radius: 10px;
            border: 1px solid #ffeb3b;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .highlight h3 {
            color: #e65100;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: linear-gradient(145deg, #ffffff, #e6e6e6);
            border-radius: 10px;
            padding: 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--secondary);
        }
        .stat-card .number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
        }
        .stat-card .label {
            font-size: 1rem;
            color: var(--gray);
            margin-top: 0.5rem;
        }
        .img-container {
            text-align: center;
            margin: 3rem 0;
        }
        .feature-img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            border: 5px solid white;
        }
        blockquote {
            font-style: italic;
            font-size: 1.3rem;
            color: var(--primary);
            border-left: 5px solid var(--accent);
            padding: 2rem;
            margin: 2.5rem 0;
            background: #f8f9fa;
            border-radius: 0 10px 10px 0;
        }
        blockquote cite {
            display: block;
            margin-top: 1rem;
            font-size: 1rem;
            color: var(--gray);
            font-style: normal;
            font-weight: 600;
        }
        .strategy-list {
            list-style: none;
            margin: 2rem 0;
        }
        .strategy-list li {
            padding: 1rem 1rem 1rem 3rem;
            margin-bottom: 1rem;
            background: #e8f4fc;
            border-radius: 8px;
            position: relative;
        }
        .strategy-list li::before {
            content: '🎯';
            position: absolute;
            left: 1rem;
            top: 1rem;
            font-size: 1.2rem;
        }
        aside {
            background-color: #f8f9fa;
            padding: 2rem;
            border-radius: 12px;
            height: fit-content;
            box-shadow: var(--shadow);
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            color: var(--secondary);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        .download-box {
            background: linear-gradient(to bottom right, var(--primary), var(--dark));
            color: white;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
        }
        .download-box .fas {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: var(--accent);
        }
        .download-box h4 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        .btn {
            display: inline-block;
            background: var(--accent);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 1rem;
        }
        .btn:hover {
            background: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0,0,0,0.2);
        }
        .btn-download {
            background: #27ae60;
        }
        .btn-download:hover {
            background: #219653;
        }
        .user-interaction {
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem;
            margin-top: 3rem;
            box-shadow: var(--shadow);
            border: 1px solid #e0e0e0;
        }
        .interaction-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .stars {
            color: #f1c40f;
            font-size: 1.5rem;
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            transform: scale(1.2);
            color: #f39c12;
        }
        form {
            display: grid;
            gap: 1.5rem;
            margin-top: 2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary);
        }
        input, textarea, select {
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            border-color: var(--accent);
            outline: none;
            box-shadow: 0 0 0 3px rgba(243, 156, 18, 0.2);
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .form-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .btn-submit {
            background: var(--secondary);
        }
        .btn-reset {
            background: var(--gray);
        }
        .web-links-section {
            background: linear-gradient(to right, var(--primary), #34495e);
            color: white;
            padding: 3rem 0;
            margin-top: 4rem;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background: rgba(255,255,255,0.1);
            padding: 1.5rem;
            border-radius: 8px;
            transition: var(--transition);
            border-left: 4px solid var(--accent);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.2);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--light);
            font-weight: 600;
        }
        .web-link a:hover {
            color: var(--accent);
        }
        footer {
            background-color: var(--dark);
            color: var(--light);
            padding: 3rem 0 2rem;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }
        .copyright {
            font-size: 0.9rem;
            color: #bdc3c7;
            margin-top: 2rem;
            border-top: 1px solid #34495e;
            padding-top: 2rem;
            width: 100%;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .content {
                padding-right: 0;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--dark);
                padding: 1rem;
                margin-top: 1rem;
                border-radius: 8px;
            }
            nav ul.active {
                display: flex;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.8rem;
                right: 20px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .logo a {
                font-size: 1.8rem;
            }
            .form-buttons {
                flex-direction: column;
            }
            .btn {
                width: 100%;
                text-align: center;
            }
        }