* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a365d;
            --secondary-color: #e53e3e;
            --accent-color: #f6ad55;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --text-color: #4a5568;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--secondary-color);
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-color);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .flex {
            display: flex;
            flex-wrap: wrap;
        }
        .grid {
            display: grid;
            gap: 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .section-padding {
            padding: 60px 0;
        }
        .site-header {
            background-color: var(--primary-color);
            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: 15px 20px;
        }
        .my-logo {
            font-size: 28px;
            font-weight: 800;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--accent-color);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 25px;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            font-size: 16px;
            padding: 5px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--accent-color);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-color);
            transition: var(--transition);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 24px;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light-color);
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 10px;
            font-size: 14px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 10px;
            color: var(--text-color);
        }
        .breadcrumb a {
            color: var(--text-color);
        }
        .breadcrumb a:hover {
            color: var(--secondary-color);
        }
        .main-content {
            padding: 40px 0;
            background-color: white;
        }
        .article-header {
            margin-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 30px;
        }
        .article-header h1 {
            font-size: 36px;
            color: var(--primary-color);
            margin-bottom: 15px;
            line-height: 1.3;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            margin-top: 20px;
            color: #718096;
            font-size: 14px;
        }
        .last-updated {
            background-color: var(--light-color);
            padding: 8px 15px;
            border-radius: 4px;
            font-weight: 600;
        }
        .last-updated i {
            margin-right: 8px;
            color: var(--secondary-color);
        }
        .content-area {
            max-width: 800px;
            margin: 0 auto;
        }
        .content-area h2 {
            font-size: 28px;
            color: var(--primary-color);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }
        .content-area h3 {
            font-size: 22px;
            color: var(--dark-color);
            margin: 30px 0 15px;
        }
        .content-area h4 {
            font-size: 18px;
            color: var(--dark-color);
            margin: 25px 0 10px;
        }
        .content-area p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .content-area strong {
            color: var(--primary-color);
        }
        .highlight-box {
            background-color: #fffaf0;
            border-left: 4px solid var(--accent-color);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 4px 4px 0;
        }
        .code-box {
            background-color: var(--dark-color);
            color: white;
            padding: 20px;
            border-radius: 4px;
            margin: 20px 0;
            overflow-x: auto;
        }
        .code-box h4 {
            color: var(--accent-color);
            margin-top: 0;
        }
        .promo-code {
            display: inline-block;
            background-color: #fed7d7;
            color: var(--primary-color);
            padding: 10px 20px;
            border-radius: 4px;
            font-weight: 800;
            letter-spacing: 1px;
            margin: 5px;
            border: 2px dashed var(--secondary-color);
        }
        .article-image {
            margin: 30px 0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 10px;
            background-color: var(--light-color);
            color: var(--text-color);
            font-size: 14px;
        }
        .interaction-section {
            background-color: var(--light-color);
            padding: 40px 0;
            margin: 60px 0;
            border-radius: 8px;
        }
        .interaction-container {
            max-width: 600px;
            margin: 0 auto;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-color);
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-family: inherit;
            font-size: 16px;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            margin: 10px 0;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 24px;
            color: #cbd5e0;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars input:checked ~ label,
        .rating-stars label:hover,
        .rating-stars label:hover ~ label {
            color: #f6ad55;
        }
        .sidebar {
            background-color: var(--light-color);
            padding: 25px;
            border-radius: 8px;
            margin-top: 40px;
        }
        .sidebar h3 {
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        .link-list {
            list-style: none;
        }
        .link-list li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--border-color);
        }
        .link-list a {
            display: flex;
            align-items: center;
            color: var(--text-color);
        }
        .link-list a:hover {
            color: var(--secondary-color);
        }
        .link-list i {
            margin-right: 10px;
            color: var(--secondary-color);
            width: 20px;
        }
        .site-footer {
            background-color: var(--primary-color);
            color: white;
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            font-size: 20px;
            margin-bottom: 20px;
            color: var(--accent-color);
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 15px 0;
        }
        friend-link {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.1);
            padding: 8px 16px;
            border-radius: 4px;
            color: white;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: var(--secondary-color);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #cbd5e0;
            font-size: 14px;
        }
        @media (max-width: 992px) {
            .content-area {
                padding: 0 20px;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .main-nav {
                width: 100%;
                order: 3;
                margin-top: 20px;
                display: none;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
            }
            .main-nav li {
                margin: 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            .main-nav a {
                display: block;
                padding: 12px 0;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 30px;
            }
            .content-area h2 {
                font-size: 24px;
            }
            .content-area h3 {
                font-size: 20px;
            }
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 40px 0;
            }
            .article-header h1 {
                font-size: 26px;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .last-updated {
                margin-top: 15px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            .article-header h1 {
                font-size: 22px;
            }
            .content-area h2 {
                font-size: 22px;
            }
            .content-area h3 {
                font-size: 18px;
            }
            .promo-code {
                padding: 8px 16px;
                font-size: 14px;
            }
        }
        @media print {
            .site-header, .breadcrumb, .interaction-section, .sidebar, .site-footer {
                display: none;
            }
            body {
                font-size: 12pt;
                color: #000;
            }
            .content-area {
                max-width: 100%;
                padding: 0;
            }
            a {
                color: #000;
                text-decoration: underline;
            }
            .article-image {
                break-inside: avoid;
            }
        }