* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-blue: #0066cc;
            --dark-blue: #004080;
            --light-blue: #e6f2ff;
            --accent-orange: #ff6600;
            --text-dark: #222222;
            --text-light: #555555;
            --background-light: #f9f9f9;
            --border-color: #dddddd;
            --white: #ffffff;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--background-light);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-orange);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background-color: var(--primary-blue);
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: var(--dark-blue);
            color: white;
            transform: translateY(-2px);
        }
        .section-padding {
            padding: 60px 0;
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mb-3 { margin-bottom: 3rem; }
        .site-header {
            background-color: var(--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 20px;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-blue);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
        }
        .logo a i {
            margin-right: 10px;
            color: var(--accent-orange);
        }
        .logo a span {
            color: var(--text-dark);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-dark);
            padding: 5px 0;
            position: relative;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--primary-blue);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-blue);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--text-dark);
            cursor: pointer;
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: var(--light-blue);
            font-size: 0.95rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .hero {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
            color: white;
            padding: 80px 20px;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .search-section {
            background-color: var(--white);
            padding: 30px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .search-form {
            max-width: 700px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-input {
            flex-grow: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-btn {
            background-color: var(--accent-orange);
            color: white;
            border: none;
            padding: 0 35px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: #e55a00;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 20px;
        }
        .article-content {
            background-color: var(--white);
            padding: 40px;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .article-content h2, .article-content h3, .article-content h4 {
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark-blue);
        }
        .article-content h2 {
            font-size: 2.2rem;
            border-bottom: 2px solid var(--light-blue);
            padding-bottom: 10px;
        }
        .article-content h3 {
            font-size: 1.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            color: var(--text-light);
            font-size: 1.05rem;
        }
        .article-content strong {
            color: var(--text-dark);
            font-weight: 700;
        }
        .article-content em {
            color: var(--primary-blue);
            font-style: italic;
        }
        .highlight-box {
            background-color: var(--light-blue);
            border-left: 5px solid var(--primary-blue);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
        }
        .img-container {
            margin: 35px 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.1);
        }
        .img-container figcaption {
            text-align: center;
            padding: 10px;
            font-size: 0.95rem;
            color: var(--text-light);
            background-color: #f0f0f0;
        }
        .feature-list, .step-list {
            padding-left: 25px;
            margin-bottom: 25px;
        }
        .feature-list li, .step-list li {
            margin-bottom: 12px;
            color: var(--text-light);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: var(--white);
            padding: 25px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--dark-blue);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light-blue);
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
            margin-bottom: 10px;
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: #ffcc00;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-dark);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
        }
        .user-comments .comment {
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
        }
        .user-comments .comment:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: 700;
            color: var(--dark-blue);
        }
        .comment-date {
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .comment-text {
            margin-top: 10px;
            color: var(--text-light);
        }
        .site-footer {
            background-color: #222;
            color: #bbb;
            padding: 60px 20px 30px;
            margin-top: 60px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 20px;
            display: block;
        }
        .footer-links h4, friend-link h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links ul, friend-link ul {
            list-style: none;
        }
        .footer-links li, friend-link li {
            margin-bottom: 12px;
        }
        .footer-links a, friend-link a {
            color: #bbb;
        }
        .footer-links a:hover, friend-link a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #444;
            font-size: 0.95rem;
            color: #888;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 2.7rem;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background-color: var(--white);
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
                transition: left 0.4s ease;
                padding: 20px;
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav a {
                display: block;
                padding: 15px;
            }
            .hamburger {
                display: block;
            }
            .hero {
                padding: 60px 20px;
            }
            .hero h1 {
                font-size: 2.3rem;
            }
            .article-content {
                padding: 25px;
            }
            .header-container, .breadcrumb, .main-content {
                padding-left: 15px;
                padding-right: 15px;
            }
        }
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .search-form {
                flex-direction: column;
                border-radius: 12px;
            }
            .search-input, .search-btn {
                width: 100%;
                border-radius: 0;
                padding: 18px;
            }
            :root {
                font-size: 15px;
            }
        }