:root {
            --primary: #2c5aa0;
            --primary-dark: #1e3a6c;
            --secondary: #ff9900;
            --light: #f8f9fa;
            --dark: #343a40;
            --gray: #6c757d;
            --success: #28a745;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            padding: 15px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            color: var(--secondary);
        }
        .logo-text {
            background: linear-gradient(to right, #fff, #ffcc80);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .search-form {
            flex: 0 1 400px;
            display: flex;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 20px;
            border: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-weight: 600;
        }
        .search-button:hover {
            background: #e68900;
        }
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .main-nav {
            background: rgba(0, 0, 0, 0.1);
        }
        .nav-list {
            display: flex;
            list-style: none;
            justify-content: center;
        }
        .nav-item {
            position: relative;
        }
        .nav-link {
            display: block;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
        }
        .nav-link:hover,
        .nav-link.active {
            background: rgba(255,255,255,0.1);
            color: var(--secondary);
        }
        .nav-link i {
            margin-right: 8px;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #f1f5fd;
            font-size: 0.95rem;
        }
        .breadcrumb-list {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb-item {
            display: flex;
            align-items: center;
        }
        .breadcrumb-item:not(:last-child)::after {
            content: '›';
            margin: 0 12px;
            color: var(--gray);
        }
        .breadcrumb-link {
            color: var(--primary);
        }
        .breadcrumb-link:hover {
            text-decoration: underline;
        }
        .main-content {
            padding: 40px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-container {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-header {
            padding: 40px 40px 20px;
            border-bottom: 2px solid #f0f0f0;
        }
        .article-title {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }
        .article-meta {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 10px;
        }
        .meta-item i {
            margin-right: 5px;
        }
        .rating-widget {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 15px;
        }
        .stars {
            color: #ffc107;
            font-size: 1.2rem;
        }
        .rating-text {
            font-weight: 600;
            color: var(--dark);
        }
        .article-body {
            padding: 40px;
        }
        .article-intro {
            font-size: 1.3rem;
            color: var(--dark);
            background: #f8f9ff;
            padding: 25px;
            border-left: 5px solid var(--secondary);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-bottom: 40px;
        }
        .content-section {
            margin-bottom: 50px;
        }
        .section-title {
            font-size: 1.8rem;
            color: var(--primary);
            padding-bottom: 12px;
            margin-bottom: 25px;
            border-bottom: 2px dashed #eaeaea;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .section-title i {
            color: var(--secondary);
        }
        .content-text {
            margin-bottom: 25px;
            font-size: 1.08rem;
            text-align: justify;
        }
        .highlight {
            background: linear-gradient(120deg, #ffecb3 0%, #ffecb3 100%);
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .feature-list {
            list-style: none;
            margin: 25px 0;
        }
        .feature-list li {
            padding: 12px 0 12px 40px;
            position: relative;
        }
        .feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 12px;
            width: 26px;
            height: 26px;
            background: var(--success);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .image-container {
            margin: 30px 0;
            text-align: center;
        }
        .article-image {
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 0 auto 15px;
            max-width: 800px;
        }
        .image-caption {
            font-style: italic;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .tip-box {
            background: #e8f4ff;
            border-left: 5px solid var(--primary);
            padding: 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin: 30px 0;
        }
        .tip-title {
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: 0 0 10px rgba(0,0,0,0.05);
        }
        .comparison-table th,
        .comparison-table td {
            padding: 16px 20px;
            text-align: left;
            border: 1px solid #dee2e6;
        }
        .comparison-table th {
            background-color: var(--primary);
            color: white;
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.4rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f0f0f0;
        }
        .download-box {
            text-align: center;
            background: linear-gradient(135deg, #f8f9ff 0%, #eef2ff 100%);
            border: 2px dashed var(--primary);
        }
        .download-button {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 16px 32px;
            border-radius: var(--border-radius);
            font-weight: 700;
            font-size: 1.2rem;
            margin: 15px 0;
            width: 100%;
        }
        .download-button:hover {
            background: #e68900;
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(255, 153, 0, 0.3);
        }
        .related-links {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dotted #eee;
        }
        .related-links li:last-child {
            margin-bottom: 0;
            border-bottom: none;
        }
        .related-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .user-interaction {
            margin-top: 50px;
            background: white;
            border-radius: var(--border-radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        .interaction-title {
            font-size: 1.8rem;
            color: var(--primary-dark);
            margin-bottom: 30px;
            text-align: center;
        }
        .rating-form,
        .comment-form {
            margin-bottom: 40px;
        }
        .form-group {
            margin-bottom: 25px;
        }
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        .form-input,
        .form-textarea,
        .form-select {
            width: 100%;
            padding: 14px 18px;
            border: 1px solid #ced4da;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus,
        .form-textarea:focus,
        .form-select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.1);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 2rem;
            color: #ddd;
            margin: 10px 0;
        }
        .star-rating label {
            cursor: pointer;
        }
        .star-rating input {
            display: none;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffc107;
        }
        .form-submit {
            background: var(--primary);
            color: white;
            border: none;
            padding: 16px 32px;
            border-radius: var(--border-radius);
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .form-submit:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.1);
        }
        .internal-links {
            background: #f8f9ff;
            padding: 50px 0 30px;
            border-top: 1px solid #eaeaea;
        }
        .web-link {
            display: inline-block;
            margin: 0 15px 15px 0;
            padding: 10px 20px;
            background: white;
            border-radius: 30px;
            box-shadow: 0 3px 8px rgba(0,0,0,0.05);
            border: 1px solid #e0e0e0;
            font-size: 0.95rem;
        }
        .web-link:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        .site-footer {
            background: var(--primary-dark);
            color: white;
            padding: 50px 0 30px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        .footer-description {
            color: rgba(255,255,255,0.8);
            margin-bottom: 25px;
        }
        .footer-title {
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.8);
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-title {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .mobile-menu-toggle {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--primary-dark);
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            }
            .nav-list.active {
                display: flex;
            }
            .nav-link {
                padding: 18px 20px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .search-form {
                display: none;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .article-header,
            .article-body {
                padding: 30px 20px;
            }
            .article-title {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 576px) {
            .footer-container {
                grid-template-columns: 1fr;
            }
            .article-meta {
                flex-direction: column;
                gap: 10px;
            }
            .user-interaction {
                padding: 30px 20px;
            }
        }