* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a365d;
            --secondary-color: #e53e3e;
            --accent-color: #f6ad55;
            --text-color: #2d3748;
            --light-bg: #f7fafc;
            --dark-bg: #1a202c;
            --border-color: #e2e8f0;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-bg);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
        }
        .logo span {
            color: var(--accent-color);
        }
        .search-form {
            display: flex;
            max-width: 400px;
            width: 100%;
        }
        .search-input {
            flex: 1;
            padding: 10px 15px;
            border: none;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
        }
        .search-button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
        }
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        nav {
            margin-top: 1rem;
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li {
            margin-right: 1.5rem;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-links a:hover {
            color: var(--accent-color);
        }
        .breadcrumb {
            margin-top: 1rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #cbd5e0;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0;
        }
        article {
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            padding: 2rem;
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        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(--secondary-color);
            margin: 1.5rem 0 1rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fffaf0;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 4px 4px 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: var(--light-bg);
            border-radius: 8px;
            padding: 1.5rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .feature-card i {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .image-container {
            margin: 2rem 0;
            text-align: center;
        }
        .article-image {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .step-by-step {
            counter-reset: step-counter;
            margin: 2rem 0;
        }
        .step {
            display: flex;
            margin-bottom: 1.5rem;
            align-items: flex-start;
        }
        .step:before {
            counter-increment: step-counter;
            content: counter(step-counter);
            background: var(--secondary-color);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }
        .download-section {
            background: linear-gradient(135deg, var(--primary-color), #2d3748);
            color: white;
            padding: 2rem;
            border-radius: 8px;
            text-align: center;
            margin: 2rem 0;
        }
        .download-button {
            display: inline-block;
            background-color: var(--accent-color);
            color: var(--dark-bg);
            padding: 12px 30px;
            border-radius: 4px;
            text-decoration: none;
            font-weight: bold;
            margin-top: 1rem;
            transition: background-color 0.3s;
        }
        .download-button:hover {
            background-color: #ed8936;
        }
        .user-interaction {
            margin-top: 3rem;
            border-top: 1px solid var(--border-color);
            padding-top: 2rem;
        }
        .rating-section {
            margin-bottom: 2rem;
        }
        .stars {
            display: flex;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.5rem;
            color: #cbd5e0;
            cursor: pointer;
            margin-right: 5px;
            transition: color 0.2s;
        }
        .star:hover, .star.active {
            color: #f6ad55;
        }
        .comment-form {
            background: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }
        .form-control {
            width: 100%;
            padding: 10px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-family: inherit;
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .submit-button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
            transition: background-color 0.3s;
        }
        .submit-button:hover {
            background-color: #2d3748;
        }
        .internal-links {
            background: var(--light-bg);
            padding: 2rem 0;
            margin-top: 2rem;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: white;
            padding: 1rem;
            border-radius: 4px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .web-link a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        .web-link a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 2rem 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .copyright {
            margin-top: 1rem;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                margin-top: 1rem;
                max-width: 100%;
            }
            .mobile-menu-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                margin: 0.5rem 0;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            article {
                padding: 1.5rem;
            }
        }