* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #FF6B35;
            --secondary: #004E89;
            --accent: #00A5CF;
            --light: #F7F9FC;
            --dark: #2D3047;
            --gray: #6C757D;
            --success: #28A745;
            --warning: #FFC107;
            --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: 1.7;
            color: var(--dark);
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .nav-list a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            padding: 8px 15px;
            border-radius: 5px;
            transition: var(--transition);
        }
        .nav-list a:hover {
            background: var(--primary);
            color: white;
        }
        .nav-list a.active {
            background: var(--secondary);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--dark);
        }
        .breadcrumb {
            background: var(--light);
            padding: 15px 0;
            border-bottom: 1px solid #eaeaea;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: var(--gray);
        }
        .search-section {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            padding: 40px 0;
            text-align: center;
            color: white;
            margin-bottom: 40px;
        }
        .search-form {
            max-width: 600px;
            margin: 20px auto 0;
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex: 1;
            padding: 15px 20px;
            border: none;
            border-radius: 50px;
            font-size: 1rem;
            box-shadow: var(--shadow);
        }
        .search-btn {
            background: var(--accent);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-btn:hover {
            background: #0093b8;
            transform: translateY(-2px);
        }
        main {
            padding: 40px 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 50px;
            padding-bottom: 30px;
            border-bottom: 3px solid var(--primary);
        }
        h1 {
            font-size: 3rem;
            color: var(--secondary);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 30px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            padding: 40px;
            margin-bottom: 40px;
            box-shadow: var(--shadow);
        }
        h2 {
            color: var(--primary);
            font-size: 2.2rem;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            color: var(--secondary);
            font-size: 1.8rem;
            margin: 30px 0 15px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            color: #444;
        }
        .highlight-box {
            background: linear-gradient(135deg, var(--light), #e3f2fd);
            border-left: 5px solid var(--accent);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .feature-item {
            background: var(--light);
            padding: 25px;
            border-radius: 10px;
            text-align: center;
            transition: var(--transition);
        }
        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .feature-item i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .image-container {
            text-align: center;
            margin: 40px 0;
        }
        .article-img {
            max-width: 100%;
            height: auto;
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-img:hover {
            transform: scale(1.02);
        }
        .download-section {
            text-align: center;
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            color: white;
            padding: 50px;
            border-radius: 15px;
            margin: 50px 0;
        }
        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 15px;
            background: white;
            color: var(--primary);
            padding: 18px 35px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.2rem;
            margin-top: 30px;
            transition: var(--transition);
        }
        .download-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }
        .user-interaction {
            background: white;
            border-radius: 15px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: var(--shadow);
        }
        .rating-system {
            text-align: center;
            margin-bottom: 40px;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 20px 0;
            font-size: 2rem;
            color: var(--warning);
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover {
            transform: scale(1.2);
        }
        .interaction-forms {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        .form-group {
            margin-bottom: 25px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 15px;
            border: 2px solid #eaeaea;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary);
            outline: none;
        }
        .submit-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .submit-btn:hover {
            background: #e55a2b;
            transform: translateY(-2px);
        }
        .longtail-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin: 50px 0;
        }
        .web-link {
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
        }
        .web-link a {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 500;
            display: block;
            padding: 10px;
        }
        .web-link a:hover {
            color: var(--primary);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 60px 0 30px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 25px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 2rem;
            }
            .nav-list {
                gap: 15px;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            nav {
                position: relative;
            }
            .nav-list {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background: white;
                flex-direction: column;
                align-items: center;
                justify-content: flex-start;
                padding-top: 40px;
                gap: 20px;
                transition: var(--transition);
                z-index: 999;
            }
            .nav-list.active {
                left: 0;
            }
            .nav-list a {
                width: 80%;
                text-align: center;
                padding: 15px;
            }
            .search-form {
                flex-direction: column;
            }
            .search-input, .search-btn {
                width: 100%;
            }
            .article-meta {
                flex-direction: column;
                gap: 10px;
            }
            .content-section {
                padding: 25px;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .download-section {
                padding: 30px 20px;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.4rem;
            }
            .logo {
                font-size: 1.8rem;
            }
            .interaction-forms {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        .text-center { text-align: center; }
        .text-primary { color: var(--primary); }
        .text-secondary { color: var(--secondary); }
        .bg-light { background: var(--light); }
        .mb-20 { margin-bottom: 20px; }
        .mb-30 { margin-bottom: 30px; }
        .mt-30 { margin-top: 30px; }
        .p-20 { padding: 20px; }