:root {
            --primary: #1a237e;
            --primary-dark: #0d1538;
            --accent: #ff5722;
            --accent-light: #ff8a50;
            --text-primary: #e8eaf6;
            --text-secondary: #b0b8e0;
            --bg-main: #121212;
            --bg-card: #1e1e2e;
            --border: #3949ab;
            --success: #4caf50;
            --warning: #ff9800;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: var(--bg-main);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: var(--accent-light);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #fff, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #fff;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: var(--primary-dark);
            flex-direction: column;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
            width: 100%;
        }
        .mobile-nav li {
            margin: 0.8rem 0;
        }
        .mobile-nav a {
            display: block;
            padding: 0.8rem;
            border-bottom: 1px solid var(--border);
            font-size: 1.1rem;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .breadcrumb a {
            margin: 0 5px;
        }
        main {
            padding: 2rem 0;
        }
        article {
            background: var(--bg-card);
            border-radius: 12px;
            padding: 2.5rem;
            margin-bottom: 2rem;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
            border: 1px solid var(--border);
        }
        h1, h2, h3, h4 {
            color: #fff;
            margin-bottom: 1.2rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            background: linear-gradient(90deg, #fff, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-align: center;
            margin-bottom: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            border-left: 5px solid var(--accent);
            padding-left: 15px;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--accent-light);
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--text-secondary);
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            background: rgba(255, 87, 34, 0.05);
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid var(--accent);
            margin-bottom: 2.5rem;
        }
        .highlight {
            background: linear-gradient(90deg, rgba(255,87,34,0.1), transparent);
            padding: 1.2rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid var(--warning);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: rgba(26, 35, 126, 0.3);
            border-radius: 10px;
            padding: 1.5rem;
            text-align: center;
            border: 1px solid var(--border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.3);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 1rem;
        }
        .stat-card h4 {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 0.5rem;
        }
        .image-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 900px;
        }
        .feature-img {
            width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.6);
            border: 2px solid var(--border);
        }
        .img-caption {
            font-style: italic;
            color: var(--text-secondary);
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .content-section {
            margin-bottom: 3rem;
        }
        ul, ol {
            padding-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        strong {
            color: var(--accent-light);
            font-weight: 700;
        }
        .quote {
            font-style: italic;
            font-size: 1.3rem;
            color: var(--text-secondary);
            border-left: 4px solid var(--success);
            padding-left: 1.5rem;
            margin: 2rem 0 2rem 2rem;
        }
        .author {
            text-align: right;
            font-weight: bold;
            color: #fff;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .comparison-table th {
            background: var(--primary);
            color: white;
            padding: 1.2rem;
            text-align: left;
        }
        .comparison-table td {
            padding: 1rem 1.2rem;
            border-bottom: 1px solid var(--border);
            background: rgba(30, 30, 46, 0.8);
        }
        .comparison-table tr:hover td {
            background: rgba(57, 73, 171, 0.3);
        }
        .cta-box {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 2.5rem;
            border-radius: 12px;
            text-align: center;
            margin: 3rem 0;
            border: 2px solid var(--accent);
        }
        .cta-button {
            display: inline-block;
            background: var(--accent);
            color: white;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.2rem;
            margin-top: 1.5rem;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .cta-button:hover {
            background: var(--accent-light);
            transform: scale(1.05);
            text-decoration: none;
        }
        .interactive-section {
            background: rgba(30, 30, 46, 0.8);
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid var(--border);
        }
        .interactive-section h3 {
            text-align: center;
            margin-bottom: 1.5rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem;
            border-radius: 8px;
            border: 1px solid var(--border);
            background: rgba(18, 18, 18, 0.8);
            color: var(--text-primary);
            font-size: 1rem;
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .rating {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin: 1rem 0;
            flex-wrap: wrap;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #555;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating label:hover,
        .rating label:hover ~ label,
        .rating input:checked ~ label {
            color: var(--warning);
        }
        .submit-btn {
            background: var(--success);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.3s;
            display: block;
            width: 100%;
            max-width: 300px;
            margin: 1.5rem auto 0;
        }
        .submit-btn:hover {
            background: #388e3c;
        }
        .longtail-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
            padding: 2rem 0;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .web-link {
            background: rgba(26, 35, 126, 0.2);
            padding: 1.2rem;
            border-radius: 8px;
            transition: background 0.3s;
        }
        .web-link:hover {
            background: rgba(26, 35, 126, 0.4);
        }
        .web-link a {
            font-size: 1.1rem;
            display: block;
        }
        footer {
            background: var(--primary-dark);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .header-container, .footer-container {
                flex-direction: column;
                text-align: center;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .longtail-links {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            article { padding: 1.5rem; }
            .cta-box { padding: 1.5rem; }
        }