* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #2A5C82;
            --secondary: #FF6B35;
            --accent: #00C9B7;
            --light: #F8F9FA;
            --dark: #212529;
            --gray: #6C757D;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
            --border-radius: 12px;
            --container-width: 1200px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.8;
            color: var(--dark);
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 1.5rem;
            color: var(--primary);
        }
        h1 {
            font-size: clamp(2.5rem, 5vw, 3.5rem);
            text-align: center;
            margin-top: 2rem;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        h2 {
            font-size: 2.2rem;
            border-left: 6px solid var(--secondary);
            padding-left: 1.5rem;
            margin-top: 3.5rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--secondary);
            margin-top: 2.5rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--accent);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.8rem;
            font-size: 1.1rem;
            text-align: justify;
            hyphens: auto;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 2rem;
        }
        header {
            background: var(--primary);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 2rem;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2.2rem;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: var(--accent);
        }
        .my-logo i {
            color: var(--secondary);
        }
        nav ul {
            display: flex;
            gap: 2.5rem;
            list-style: none;
        }
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.8rem 1.2rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
            position: relative;
        }
        nav a:hover {
            background: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
            transform: translateX(-50%);
        }
        nav a:hover::after {
            width: 80%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background: var(--light);
            padding: 1.2rem 2rem;
            font-size: 0.95rem;
            border-bottom: 1px solid #dee2e6;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        .search-container {
            background: linear-gradient(135deg, var(--primary), #1a4365);
            padding: 3.5rem 2rem;
            text-align: center;
            color: white;
            margin-bottom: 3rem;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
        }
        .search-form {
            max-width: 700px;
            margin: 2rem auto 0;
            display: flex;
            gap: 0;
        }
        .search-form input {
            flex: 1;
            padding: 1.2rem 1.8rem;
            border: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1.1rem;
            outline: none;
        }
        .search-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 2.2rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: #ff8533;
            transform: scale(1.05);
        }
        main {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 3.5rem;
            margin: 2.5rem auto;
            position: relative;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem 0;
            border-bottom: 2px solid var(--light);
            margin-bottom: 3rem;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .last-updated {
            background: var(--accent);
            color: white;
            padding: 0.6rem 1.2rem;
            border-radius: 20px;
            font-weight: 600;
        }
        .featured-image {
            width: 100%;
            height: 500px;
            object-fit: cover;
            border-radius: var(--border-radius);
            margin: 2.5rem 0;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            transition: var(--transition);
        }
        .featured-image:hover {
            transform: scale(1.01);
            box-shadow: 0 12px 35px rgba(0,0,0,0.2);
        }
        .highlight-box {
            background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
            border-left: 6px solid var(--accent);
            padding: 2.2rem;
            margin: 2.8rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .tip {
            background: #fff8e1;
            border: 2px solid #ffd54f;
            padding: 1.8rem;
            border-radius: var(--border-radius);
            margin: 2.2rem 0;
            position: relative;
        }
        .tip::before {
            content: '💡';
            position: absolute;
            left: -15px;
            top: -15px;
            background: white;
            border-radius: 50%;
            padding: 8px;
            font-size: 1.5rem;
            box-shadow: var(--shadow);
        }
        .interactive-section {
            background: var(--light);
            padding: 3rem;
            border-radius: var(--border-radius);
            margin: 4rem 0;
            border: 2px dashed var(--accent);
        }
        .rating-container {
            display: flex;
            gap: 1rem;
            align-items: center;
            margin: 2rem 0;
        }
        .star-rating {
            display: flex;
            gap: 5px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2.2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffd700;
        }
        .star-rating input:checked ~ label {
            color: #ffd700;
        }
        .comment-form, .rating-form {
            display: grid;
            gap: 1.5rem;
            margin-top: 2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .form-group label {
            font-weight: 600;
            color: var(--primary);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            padding: 1rem 1.5rem;
            border: 2px solid #dee2e6;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0,201,183,0.2);
        }
        .btn {
            background: linear-gradient(135deg, var(--secondary), #ff8533);
            color: white;
            border: none;
            padding: 1.2rem 2.5rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            text-decoration: none;
            display: inline-block;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(255,107,53,0.3);
        }
        .btn-secondary {
            background: linear-gradient(135deg, var(--primary), #1a4365);
        }
        .btn-secondary:hover {
            box-shadow: 0 7px 20px rgba(42,92,130,0.3);
        }
        .content-highlight {
            background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%);
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            position: relative;
            overflow: hidden;
        }
        .content-highlight::before {
            content: '🌟';
            position: absolute;
            right: 20px;
            top: 20px;
            font-size: 2.5rem;
            opacity: 0.3;
        }
        blockquote {
            border-left: 5px solid var(--secondary);
            padding: 2rem;
            margin: 2.5rem 0;
            background: var(--light);
            font-style: italic;
            font-size: 1.2rem;
            color: var(--dark);
            position: relative;
        }
        blockquote::after {
            content: '"';
            position: absolute;
            right: 20px;
            bottom: 10px;
            font-size: 4rem;
            color: var(--accent);
            opacity: 0.2;
        }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 4rem 0;
        }
        .link-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.8rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 2px solid transparent;
        }
        .link-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        }
        .link-card h4 {
            margin-top: 0;
            color: var(--primary);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 4rem 2rem 2rem;
            margin-top: 5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            max-width: var(--container-width);
            margin: 0 auto;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 1.8rem;
            border-left: 4px solid var(--secondary);
            padding-left: 1rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 1rem;
        }
        .footer-links a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-links a:hover {
            color: var(--accent);
            transform: translateX(5px);
        }
        .friend-links {
            background: rgba(255,255,255,0.05);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        friend-link {
            display: inline-block;
            background: rgba(0,201,183,0.1);
            color: var(--accent);
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 20px;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid rgba(0,201,183,0.3);
        }
        friend-link:hover {
            background: var(--accent);
            color: white;
            transform: scale(1.05);
        }
        .copyright {
            text-align: center;
            padding-top: 3rem;
            margin-top: 3rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #adb5bd;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .container {
                padding: 0 1.5rem;
            }
            main {
                padding: 2.5rem;
            }
            nav ul {
                gap: 1.5rem;
            }
            h2 {
                font-size: 2rem;
            }
            h3 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            nav ul {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background: var(--primary);
                flex-direction: column;
                padding: 2rem;
                gap: 0;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: var(--transition);
                box-shadow: var(--shadow);
            }
            nav ul.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            nav li {
                width: 100%;
            }
            nav a {
                display: block;
                padding: 1.2rem;
                border-radius: 8px;
                margin-bottom: 0.8rem;
            }
            .header-container {
                padding: 1rem 1.5rem;
            }
            .search-container {
                padding: 2.5rem 1.5rem;
            }
            .search-form {
                flex-direction: column;
                gap: 1rem;
            }
            .search-form input,
            .search-form button {
                border-radius: var(--border-radius);
                width: 100%;
            }
            .featured-image {
                height: 300px;
            }
            .rating-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .article-meta {
                flex-direction: column;
                gap: 1.5rem;
                align-items: flex-start;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 1rem;
            }
            main {
                padding: 1.8rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
                padding-left: 1rem;
            }
            .featured-image {
                height: 220px;
            }
            .interactive-section {
                padding: 2rem 1.5rem;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }
        .text-center {
            text-align: center;
        }
        .text-primary {
            color: var(--primary);
        }
        .text-secondary {
            color: var(--secondary);
        }
        .mb-3 {
            margin-bottom: 3rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .py-3 {
            padding-top: 3rem;
            padding-bottom: 3rem;
        }
        .content-section {
            margin-bottom: 4rem;
            padding-bottom: 3rem;
            border-bottom: 1px solid #eaeaea;
        }
        .stat-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-item {
            background: white;
            padding: 1.8rem;
            border-radius: var(--border-radius);
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--accent);
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .stat-label {
            color: var(--gray);
            font-size: 0.95rem;
            font-weight: 600;
        }
        .key-term {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 4px;
            font-weight: 600;
            margin: 0 0.2rem;
        }
        .quote-source {
            display: block;
            text-align: right;
            margin-top: 1rem;
            color: var(--gray);
            font-weight: 600;
            font-style: normal;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2.5rem 0;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .comparison-table th {
            background: var(--primary);
            color: white;
            padding: 1.5rem;
            text-align: left;
            font-weight: 600;
        }
        .comparison-table td {
            padding: 1.2rem 1.5rem;
            border-bottom: 1px solid #dee2e6;
        }
        .comparison-table tr:nth-child(even) {
            background: #f8f9fa;
        }
        .comparison-table tr:hover {
            background: #e3f2fd;
        }
        .step-container {
            counter-reset: step-counter;
        }
        .step-item {
            position: relative;
            padding-left: 4rem;
            margin-bottom: 3rem;
            min-height: 100px;
        }
        .step-item::before {
            counter-increment: step-counter;
            content: counter(step-counter);
            position: absolute;
            left: 0;
            top: 0;
            width: 50px;
            height: 50px;
            background: var(--secondary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 800;
        }
        .step-title {
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 0.8rem;
        }