:root {
            --primary: #4361ee;
            --secondary: #3a0ca3;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .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-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--accent);
        }
        .logo:hover {
            color: var(--secondary);
        }
        .search-box {
            flex: 0 1 400px;
            position: relative;
        }
        .search-box input {
            width: 100%;
            padding: 12px 20px;
            border: 2px solid #e9ecef;
            border-radius: 50px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        .search-box button {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--secondary);
        }
        .nav-desktop {
            display: flex;
            background: linear-gradient(to right, var(--primary), var(--secondary));
        }
        .nav-desktop a {
            color: white;
            padding: 18px 22px;
            font-weight: 500;
            position: relative;
        }
        .nav-desktop a:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: width 0.3s;
        }
        .nav-desktop a:hover::after {
            width: 80%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
            padding: 5px;
        }
        .nav-mobile {
            display: none;
            background: white;
            box-shadow: inset 0 5px 10px rgba(0,0,0,0.05);
            padding: 15px 0;
        }
        .nav-mobile.active {
            display: block;
        }
        .nav-mobile a {
            display: block;
            padding: 14px 20px;
            border-bottom: 1px solid #eee;
            color: var(--dark);
            font-weight: 500;
        }
        .nav-mobile a:hover {
            background: #f8f9fa;
            color: var(--primary);
            padding-left: 28px;
        }
        .breadcrumb {
            padding: 15px 0;
            background: #f8f9fa;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            margin: 0 8px;
            color: #adb5bd;
        }
        main {
            padding: 40px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .content-area {
            background: white;
            border-radius: var(--radius);
            overflow: hidden;
        }
        .article-header {
            padding: 40px;
            background: linear-gradient(135deg, #4361ee, #3a0ca3);
            color: white;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 20px;
            color: rgba(255,255,255,0.9);
            font-size: 0.95rem;
        }
        .meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-body {
            padding: 40px;
        }
        .article-body > * {
            margin-bottom: 1.8em;
        }
        h2, h3 {
            color: var(--secondary);
            margin-top: 2em;
            margin-bottom: 0.8em;
            line-height: 1.3;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--accent);
            padding-left: 15px;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--primary);
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
        }
        strong {
            color: var(--secondary);
            font-weight: 700;
        }
        .highlight {
            background: linear-gradient(120deg, #ffecd2 0%, #fcb69f 100%);
            padding: 25px;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent);
            margin: 2em 0;
        }
        .highlight p {
            margin-bottom: 0;
            font-size: 1.1rem;
        }
        .feature-image {
            width: 100%;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 2em 0;
            transition: transform 0.5s ease;
        }
        .feature-image:hover {
            transform: scale(1.01);
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 8px;
            font-size: 0.95rem;
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
            margin: 2.5em 0;
        }
        .tip-card {
            background: white;
            border-radius: var(--radius);
            padding: 25px;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--primary);
            transition: var(--transition);
        }
        .tip-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.12);
        }
        .tip-card h4 {
            color: var(--secondary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .download-box {
            background: linear-gradient(to right, #e3f2fd, #f3e5f5);
            padding: 30px;
            border-radius: var(--radius);
            text-align: center;
            margin: 3em 0;
        }
        .download-box h3 {
            margin-top: 0;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
        }
        .btn:hover {
            background: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(67, 97, 238, 0.3);
        }
        .btn i {
            margin-right: 8px;
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            margin-top: 0;
            padding-bottom: 15px;
            border-bottom: 2px solid #f1f3f5;
            margin-bottom: 20px;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 2rem;
            color: #ffc107;
            margin: 15px 0;
            letter-spacing: 5px;
        }
        .rating-form input, .comment-form input, .comment-form textarea, .search-box input {
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 15px;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            font-family: inherit;
            transition: var(--transition);
        }
        .rating-form input:focus, .comment-form input:focus, .comment-form textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        .form-note {
            font-size: 0.85rem;
            color: var(--gray);
            margin-top: 10px;
        }
        .popular-links li {
            padding: 12px 0;
            border-bottom: 1px dashed #eee;
        }
        .popular-links li:last-child {
            border-bottom: none;
        }
        .popular-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--dark);
        }
        .popular-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .longtail-links {
            background: #f8f9fa;
            padding: 40px 0;
            margin-top: 40px;
        }
        .web-link {
            display: inline-block;
            background: white;
            margin: 8px;
            padding: 12px 24px;
            border-radius: 50px;
            box-shadow: 0 3px 8px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
            font-size: 0.95rem;
        }
        .web-link:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .links-container {
            text-align: center;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 15px;
            color: white;
        }
        .footer-about p {
            color: #adb5bd;
            margin-bottom: 20px;
        }
        .social-links {
            display: flex;
            gap: 15px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            font-size: 1.1rem;
        }
        .social-links a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .footer-heading {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: white;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-heading::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--accent);
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #adb5bd;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 8px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #495057;
            color: #6c757d;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .article-header h1 {
                font-size: 2.3rem;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .search-box {
                flex: 0 1 300px;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
                gap: 15px;
            }
            .logo {
                order: 1;
            }
            .hamburger {
                order: 2;
            }
            .search-box {
                order: 3;
                flex: 0 0 100%;
            }
            .article-header {
                padding: 30px 20px;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .article-body {
                padding: 30px 20px;
            }
            h2 {
                font-size: 1.7rem;
            }
            .tips-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .footer-heading::after {
                left: 50%;
                transform: translateX(-50%);
            }
            .social-links {
                justify-content: center;
            }
        }
        @media (max-width: 480px) {
            .article-header h1 {
                font-size: 1.7rem;
            }
            .meta {
                flex-direction: column;
                gap: 10px;
                align-items: center;
            }
            .btn {
                padding: 12px 24px;
                width: 100%;
            }
            .download-box {
                padding: 25px 15px;
            }
        }