:root {
            --primary: #1a237e;
            --secondary: #ff9800;
            --accent: #4caf50;
            --light: #f5f5f5;
            --dark: #212121;
            --text: #333333;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul { list-style: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            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);
            border: 0;
        }
        header {
            background-color: var(--primary);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--secondary);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
        }
        .my-logo i { margin-right: 10px; }
        .my-logo:hover { color: white; }
        .search-box {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            flex: 0 1 400px;
        }
        .search-box input {
            flex-grow: 1;
            border: none;
            padding: 12px 20px;
            font-size: 1rem;
            outline: none;
        }
        .search-box button {
            background: var(--secondary);
            border: none;
            color: white;
            padding: 0 25px;
            cursor: pointer;
            font-size: 1.1rem;
        }
        .search-box button:hover { background: #e68900; }
        nav.desktop-nav ul {
            display: flex;
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--radius);
            padding: 5px;
        }
        nav.desktop-nav li { margin: 0 5px; }
        nav.desktop-nav a {
            display: block;
            padding: 12px 20px;
            border-radius: var(--radius);
            font-weight: 600;
        }
        nav.desktop-nav a:hover,
        nav.desktop-nav a.active {
            background: var(--secondary);
            color: var(--primary);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--secondary);
        }
        .mobile-nav {
            display: none;
            background: var(--primary);
            padding: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav.active { display: block; }
        .mobile-nav ul li { margin-bottom: 15px; }
        .mobile-nav a {
            display: block;
            padding: 12px;
            border-radius: var(--radius);
            border-left: 4px solid transparent;
        }
        .mobile-nav a:hover,
        .mobile-nav a.active {
            border-left-color: var(--secondary);
            background: rgba(255, 255, 255, 0.05);
        }
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.9rem;
            color: #aaa;
            background: #f0f0f0;
        }
        .breadcrumb a { color: var(--primary); }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { margin: 0 8px; }
        main {
            padding: 40px 0;
            background: white;
        }
        article {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 20px;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 25px;
            line-height: 1.2;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #eee;
        }
        h3 {
            font-size: 1.6rem;
            color: var(--dark);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: #555;
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--dark);
            background: #f8f9fa;
            padding: 20px;
            border-left: 5px solid var(--accent);
            border-radius: var(--radius);
            margin-bottom: 30px;
        }
        .highlight {
            background: linear-gradient(120deg, #ffecb3 0%, #ffecb3 100%);
            padding: 3px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .emoji { margin-right: 8px; }
        .feature-img {
            width: 100%;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 30px 0;
            border: 5px solid white;
            outline: 1px solid #eee;
        }
        .float-img {
            float: right;
            width: 45%;
            margin: 15px 0 20px 30px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
        }
        blockquote {
            background: linear-gradient(to right, var(--primary), #283593);
            color: white;
            padding: 30px;
            border-radius: var(--radius);
            margin: 30px 0;
            font-style: italic;
            font-size: 1.2rem;
            position: relative;
        }
        blockquote::before {
            content: "\f10d";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            top: 15px;
            left: 20px;
            font-size: 2rem;
            opacity: 0.3;
        }
        blockquote cite {
            display: block;
            margin-top: 15px;
            font-style: normal;
            font-weight: bold;
            color: var(--secondary);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .stat-card {
            background: var(--light);
            padding: 25px;
            border-radius: var(--radius);
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--accent);
        }
        .stat-card i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .stat-card h3 {
            font-size: 2.5rem;
            color: var(--secondary);
            margin: 10px 0;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: var(--shadow);
            border-radius: var(--radius);
            overflow: hidden;
        }
        .comparison-table th,
        .comparison-table td {
            padding: 18px 15px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        .comparison-table th {
            background-color: var(--primary);
            color: white;
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) { background-color: #f9f9f9; }
        .comparison-table tr:hover { background-color: #f1f1f1; }
        .comparison-table .best { color: var(--accent); font-weight: bold; }
        .btn {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 14px 30px;
            border-radius: 50px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
        }
        .btn:hover {
            background: #e68900;
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(255, 152, 0, 0.3);
        }
        .btn i { margin-right: 10px; }
        .interactive-section {
            background: #f0f7ff;
            padding: 40px;
            border-radius: var(--radius);
            margin: 50px 0;
            text-align: center;
        }
        .interactive-section h2 { border: none; }
        .rating {
            display: flex;
            justify-content: center;
            margin: 30px 0;
            direction: rtl;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2.5rem;
            color: #ccc;
            cursor: pointer;
            transition: var(--transition);
            margin: 0 5px;
        }
        .rating label:hover,
        .rating label:hover ~ label,
        .rating input:checked ~ label {
            color: #ffc107;
        }
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 15px;
            margin-bottom: 20px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .comment-form textarea:focus,
        .comment-form input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.1);
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        .update-time {
            text-align: center;
            font-size: 0.9rem;
            color: #777;
            margin-top: 50px;
            padding-top: 20px;
            border-top: 1px solid #eee;
        }
        footer {
            background: var(--dark);
            color: #bbb;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.4rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-section h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: #bbb; }
        .footer-links a:hover { color: var(--secondary); padding-left: 5px; }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: var(--radius);
            margin-bottom: 10px;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        friend-link a { color: var(--secondary); font-weight: 600; }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #888;
        }
        @media (max-width: 1024px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .float-img { width: 50%; margin: 15px 0 20px 20px; }
        }
        @media (max-width: 768px) {
            .header-top { flex-wrap: wrap; }
            .search-box { order: 3; flex: 1 1 100%; margin-top: 20px; }
            nav.desktop-nav { display: none; }
            .mobile-toggle { display: block; }
            .float-img { float: none; width: 100%; margin: 20px 0; }
            .stats-grid { grid-template-columns: 1fr; }
            .interactive-section { padding: 30px 20px; }
            .rating label { font-size: 2rem; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .lead { font-size: 1.1rem; }
            .btn { padding: 12px 25px; }
            .footer-content { grid-template-columns: 1fr; }
        }