* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #6A5ACD;
            --secondary-color: #FF6B6B;
            --accent-color: #4ECDC4;
            --dark-color: #2D3047;
            --light-color: #F7F9FC;
            --text-color: #333333;
            --border-radius: 8px;
            --box-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: 1.6;
            color: var(--text-color);
            background-color: var(--light-color);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
            color: white;
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: var(--accent-color);
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 15px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .nav-links a:hover {
            background-color: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
            margin-bottom: 40px;
        }
        article {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        aside {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            align-self: start;
            position: sticky;
            top: 20px;
        }
        h1 {
            color: var(--primary-color);
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--accent-color);
        }
        h2 {
            color: var(--dark-color);
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            padding-left: 10px;
            border-left: 5px solid var(--secondary-color);
        }
        h3 {
            color: var(--primary-color);
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            color: var(--dark-color);
            font-size: 1.1rem;
            margin: 1.2rem 0 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 20px 0;
            box-shadow: var(--box-shadow);
        }
        .image-container {
            text-align: center;
            margin: 25px 0;
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 8px;
            font-size: 0.9rem;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 8px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        th {
            background-color: var(--primary-color);
            color: white;
            padding: 15px;
            text-align: left;
        }
        td {
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        .btn {
            display: inline-block;
            background: var(--primary-color);
            color: white;
            padding: 12px 25px;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background: var(--dark-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0,0,0,0.1);
        }
        .btn-secondary {
            background: var(--secondary-color);
        }
        .btn-small {
            padding: 8px 15px;
            font-size: 0.9rem;
        }
        .interactive-form {
            background: #f8f9fa;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
        }
        .form-group {
            margin-bottom: 15px;
        }
        .form-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(106, 90, 205, 0.2);
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: #FFD700;
        }
        .social-share {
            display: flex;
            gap: 15px;
            margin: 20px 0;
        }
        .social-icon {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .facebook {
            background: #3b5998;
        }
        .twitter {
            background: #1DA1F2;
        }
        .pinterest {
            background: #E60023;
        }
        .social-icon:hover {
            transform: translateY(-3px);
            opacity: 0.9;
        }
        #back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            z-index: 1000;
        }
        #back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        #back-to-top:hover {
            background: var(--dark-color);
            transform: translateY(-5px);
        }
        footer {
            background: var(--dark-color);
            color: white;
            padding: 40px 20px;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-section h3 {
            color: var(--accent-color);
            border-left: none;
            padding-left: 0;
            margin-bottom: 20px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .friend-link {
            background: rgba(255,255,255,0.05);
            padding: 10px 15px;
            border-radius: var(--border-radius);
            margin: 8px 0;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        .update-log {
            background: #e8f4fd;
            border-left: 5px solid #2196F3;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .tip-box {
            background: #fff8e1;
            border-left: 5px solid #FFC107;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                gap: 20px;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                text-align: center;
                gap: 15px;
                padding-top: 20px;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 25px;
                right: 20px;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            article, aside {
                padding: 20px;
            }
            .social-share {
                justify-content: center;
            }
            #back-to-top {
                bottom: 20px;
                right: 20px;
                width: 45px;
                height: 45px;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 10px;
            }
            .btn {
                width: 100%;
                text-align: center;
            }
            table {
                display: block;
                overflow-x: auto;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        .text-center {
            text-align: center;
        }
        .text-primary {
            color: var(--primary-color);
        }
        .mb-3 {
            margin-bottom: 1rem;
        }
        .mt-3 {
            margin-top: 1rem;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(78, 205, 196, 0.2) 0%, rgba(78, 205, 196, 0) 100%);
            padding: 2px 5px;
            border-radius: 3px;
        }
        .badge {
            display: inline-block;
            background: var(--secondary-color);
            color: white;
            padding: 3px 8px;
            border-radius: 12px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 8px;
        }
        .toc {
            background: #f8f9fa;
            padding: 20px;
            border-radius: var(--border-radius);
            margin-bottom: 25px;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ul {
            columns: 2;
        }
        @media (max-width: 768px) {
            .toc ul {
                columns: 1;
            }
        }