:root {
            --primary-blue: #1a73e8;
            --accent-green: #00c853;
            --dark-bg: #121212;
            --light-bg: #f8f9fa;
            --text-primary: #333333;
            --text-secondary: #5f6368;
            --card-bg: #ffffff;
            --border-color: #e0e0e0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 8px 24px rgba(26, 115, 232, 0.15);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--text-primary);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--card-bg);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-blue);
            text-decoration: none;
            background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .desktop-nav a {
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            transition: color 0.3s ease;
            padding: 5px 0;
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--primary-blue);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-green);
            transition: width 0.3s ease;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .search-form {
            display: flex;
            align-items: center;
            background: #f1f3f4;
            border-radius: 24px;
            padding: 8px 16px;
            max-width: 300px;
        }
        .search-form input {
            border: none;
            background: transparent;
            padding: 5px 10px;
            width: 100%;
            outline: none;
            font-size: 0.95rem;
        }
        .search-form button {
            border: none;
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
        }
        .mobile-nav {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: var(--card-bg);
            box-shadow: -5px 0 15px rgba(0,0,0,0.1);
            transition: right 0.4s ease;
            z-index: 1001;
            padding: 60px 20px 20px;
        }
        .mobile-nav.active {
            right: 0;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav li {
            margin-bottom: 20px;
        }
        .mobile-nav a {
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1.1rem;
            display: block;
            padding: 10px;
            border-radius: 8px;
            transition: background 0.3s;
        }
        .mobile-nav a:hover {
            background-color: #f0f7ff;
        }
        .close-mobile-menu {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-secondary);
            cursor: pointer;
        }
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
            display: none;
        }
        .overlay.active {
            display: block;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #f5f7fa;
            margin-bottom: 30px;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin-left: 10px;
        }
        .breadcrumb a {
            color: var(--primary-blue);
            text-decoration: none;
        }
        main {
            padding: 30px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 40px;
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--dark-bg);
            line-height: 1.3;
        }
        h2 {
            font-size: 1.8rem;
            margin: 40px 0 20px;
            color: var(--primary-blue);
            border-bottom: 2px solid var(--accent-green);
            padding-bottom: 10px;
        }
        h3 {
            font-size: 1.4rem;
            margin: 30px 0 15px;
            color: var(--text-primary);
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.05rem;
        }
        .article-meta {
            display: flex;
            gap: 20px;
            margin-bottom: 30px;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .featured-img {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 25px 0;
            box-shadow: var(--shadow);
            transition: transform 0.5s ease;
        }
        .featured-img:hover {
            transform: scale(1.01);
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0f7ff, #e3f2fd);
            border-left: 5px solid var(--primary-blue);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .highlight-box h4 {
            color: var(--primary-blue);
            margin-bottom: 10px;
            font-size: 1.2rem;
        }
        .content-link {
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dashed var(--primary-blue);
            transition: all 0.3s;
        }
        .content-link:hover {
            border-bottom-style: solid;
            color: #0d47a1;
        }
        emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .tip {
            background-color: #fff8e1;
            padding: 15px;
            border-radius: 8px;
            margin: 20px 0;
            border-left: 4px solid #ffc107;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .comparison-table th, .comparison-table td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        .comparison-table th {
            background-color: var(--primary-blue);
            color: white;
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        .comparison-table tr:hover {
            background-color: #e8f0fe;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: var(--card-bg);
            padding: 25px;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            margin-top: 0;
            font-size: 1.3rem;
            color: var(--primary-blue);
        }
        .download-box {
            background: linear-gradient(135deg, #1a73e8, #00c853);
            color: white;
            text-align: center;
            padding: 30px 20px;
            border-radius: 12px;
        }
        .download-box h3 {
            color: white;
        }
        .download-btn {
            display: inline-block;
            background: white;
            color: var(--primary-blue);
            padding: 12px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            margin-top: 15px;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }
        .download-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.25);
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed var(--border-color);
        }
        .related-links a {
            text-decoration: none;
            color: var(--text-primary);
            transition: color 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-links a:hover {
            color: var(--primary-blue);
        }
        .related-links i {
            color: var(--accent-green);
        }
        .user-interaction {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid var(--border-color);
        }
        .rating-widget, .comment-form {
            background: var(--card-bg);
            padding: 25px;
            border-radius: 12px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
        }
        .rating-widget h3, .comment-form h3 {
            margin-top: 0;
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffc107;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary-blue);
            outline: none;
        }
        .submit-btn {
            background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
            color: white;
            border: none;
            padding: 14px 30px;
            border-radius: 8px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .footer-links {
            background-color: #2d3748;
            padding: 40px 0;
            margin-top: 60px;
        }
        .web-link {
            display: inline-block;
            margin: 8px 15px 8px 0;
        }
        .web-link a {
            color: #cbd5e0;
            text-decoration: none;
            padding: 8px 15px;
            background: #4a5568;
            border-radius: 6px;
            font-size: 0.9rem;
            transition: all 0.3s;
        }
        .web-link a:hover {
            background: var(--primary-blue);
            color: white;
        }
        .site-footer {
            background-color: var(--dark-bg);
            color: #b0b7c3;
            padding: 40px 0;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .copyright {
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .desktop-nav, .search-form {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            .article-content {
                padding: 25px;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .article-meta {
                flex-direction: column;
                gap: 10px;
            }
        }