* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2a7de1; text-decoration: none; transition: color 0.3s, background-color 0.3s; }
        a:hover { color: #1a5cb0; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section-padding { padding: 4rem 0; }
        .text-center { text-align: center; }
        .site-header {
            background: linear-gradient(90deg, #1a3a5f 0%, #2c5282 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #4ade80;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { color: #22c55e; }
        .my-logo i { font-size: 2rem; }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
        }
        .nav-desktop a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #4ade80;
            transition: width 0.3s;
        }
        .nav-desktop a:hover { color: white; }
        .nav-desktop a:hover:after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2c5282;
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: #e2e8f0;
            padding: 0.8rem;
            border-bottom: 1px solid #4a5568;
            font-weight: 600;
        }
        .nav-mobile a:last-child { border-bottom: none; }
        .nav-mobile a:hover { background: #4a5568; color: white; }
        .breadcrumb {
            background: #edf2f7;
            padding: 0.8rem 20px;
            font-size: 0.9rem;
            color: #4a5568;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb a { color: #2d3748; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb i { margin: 0 0.5rem; }
        main { flex: 1; }
        .article-header { margin-bottom: 3rem; }
        .article-header h1 {
            font-size: 2.8rem;
            color: #1a3a5f;
            margin-bottom: 1rem;
            line-height: 1.2;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
        }
        @media (max-width: 768px) {
            .article-header h1 { font-size: 2.2rem; }
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            color: #718096;
            font-size: 0.95rem;
            margin-top: 1rem;
        }
        .article-meta span { display: flex; align-items: center; gap: 0.5rem; }
        .highlight-box {
            background: linear-gradient(120deg, #e0f2fe 0%, #fef3c7 100%);
            border-left: 5px solid #3b82f6;
            padding: 1.5rem;
            margin: 2.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .featured-img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
            margin: 2.5rem auto;
            border: 5px solid white;
        }
        .article-content {
            font-size: 1.1rem;
            color: #2d3748;
        }
        .article-content p {
            margin-bottom: 1.8rem;
            text-align: justify;
        }
        .article-content h2 {
            font-size: 2.2rem;
            color: #2d3748;
            margin: 3.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #4ade80;
        }
        .article-content h3 {
            font-size: 1.8rem;
            color: #374151;
            margin: 2.8rem 0 1.2rem;
        }
        .article-content h4 {
            font-size: 1.5rem;
            color: #4b5563;
            margin: 2.2rem 0 1rem;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 1.8rem;
            padding-left: 2rem;
        }
        .article-content li { margin-bottom: 0.8rem; }
        .article-content strong {
            color: #1e40af;
            font-weight: 700;
        }
        .article-content em { font-style: italic; color: #555; }
        .quote {
            font-style: italic;
            font-size: 1.2rem;
            color: #4a5568;
            border-left: 4px solid #a78bfa;
            padding-left: 1.5rem;
            margin: 2.5rem 0;
        }
        .comparison-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .comparison-card {
            background: white;
            border-radius: 10px;
            padding: 1.8rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .comparison-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.12);
        }
        .comparison-card h4 { color: #1e40af; }
        .interactive-section {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            margin: 4rem 0;
            box-shadow: 0 8px 30px rgba(0,0,0,0.1);
        }
        .interactive-section h2 { text-align: center; margin-top: 0; }
        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2.5rem;
            margin-top: 2rem;
        }
        .form-group { margin-bottom: 1.5rem; }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #4a5568;
        }
        .form-control {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #4ade80;
            box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.2);
        }
        textarea.form-control { min-height: 120px; resize: vertical; }
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #3b82f6, #1d4ed8);
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
        }
        .btn:hover {
            background: linear-gradient(90deg, #1d4ed8, #1e40af);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(30, 64, 175, 0.3);
        }
        .btn i { margin-right: 8px; }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #fbbf24; }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a {
            color: #a0aec0;
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        .footer-links a:hover { color: #4ade80; }
        friend-link {
            display: block;
            background: #2d3748;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        friend-link h4 {
            color: #90cdf4;
            margin-bottom: 1rem;
        }
        friend-link a {
            color: #e2e8f0;
            padding: 0.5rem;
            display: inline-block;
            background: #4a5568;
            border-radius: 5px;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        friend-link a:hover { background: #2d3748; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }