* { 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;
            padding-top: 80px; 
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #1a365d; margin-bottom: 1rem; font-weight: 700; line-height: 1.2; }
        h1 { font-size: 2.8rem; border-bottom: 4px solid #00a8ff; padding-bottom: 0.5rem; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; color: #2d3748; margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #00a8ff; }
        h3 { font-size: 1.8rem; color: #4a5568; margin-top: 2rem; }
        h4 { font-size: 1.4rem; color: #718096; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        a { color: #00a8ff; text-decoration: none; transition: color 0.3s ease, background-color 0.3s ease; }
        a:hover { color: #0056b3; background-color: rgba(0, 168, 255, 0.05); }
        strong { color: #e53e3e; font-weight: 700; }
        em { color: #38a169; font-style: italic; }
        .highlight { background-color: #fff3cd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        .last-updated { font-size: 0.9rem; color: #718096; text-align: right; margin-bottom: 2rem; padding-top: 1rem; border-top: 1px dashed #cbd5e0; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            color: white;
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo a {
            font-size: 2rem;
            font-weight: 800;
            color: #00a8ff;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i { font-size: 2.2rem; }
        .my-logo a:hover { color: white; background-color: transparent; }
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        nav a {
            color: #cbd5e0;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
        }
        nav a:hover, nav a.active {
            color: white;
            background-color: #00a8ff;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e2e8f0;
            padding: 12px 20px;
            margin-bottom: 2rem;
            border-radius: 5px;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin-left: 10px;
            color: #718096;
        }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { color: #00a8ff; }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 30px 0;
        }
        .article-content { background: white; padding: 30px; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); }
        .sidebar-widget {
            background: white;
            padding: 25px;
            margin-bottom: 25px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar-widget h3 { font-size: 1.4rem; margin-top: 0; padding-bottom: 10px; border-bottom: 2px solid #00a8ff; }
        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #4a5568; }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: #00a8ff;
            box-shadow: 0 0 0 3px rgba(0, 168, 255, 0.2);
        }
        textarea.form-control { min-height: 120px; resize: vertical; }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #00a8ff, #0097e6);
            color: white;
            padding: 12px 25px;
            border: none;
            border-radius: 5px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn:hover {
            background: linear-gradient(to right, #0097e6, #00a8ff);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 168, 255, 0.3);
        }
        .stars-rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .stars-rating input { display: none; }
        .stars-rating label {
            font-size: 1.8rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .stars-rating input:checked ~ label,
        .stars-rating label:hover,
        .stars-rating label:hover ~ label { color: #ffc107; }
        .featured-image {
            margin: 2.5rem 0;
            text-align: center;
        }
        .featured-image img {
            border-radius: 10px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            border: 5px solid white;
        }
        .img-caption {
            font-style: italic;
            color: #718096;
            margin-top: 10px;
            font-size: 0.9rem;
        }
        .related-links {
            background-color: #f1f8ff;
            padding: 25px;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style-position: inside; }
        .related-links li { margin-bottom: 10px; }
        footer {
            background-color: #1a365d;
            color: #cbd5e0;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            margin-bottom: 8px;
            color: #00a8ff;
        }
        friend-link:hover { color: white; }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            main { grid-template-columns: 1fr; }
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            body { padding-top: 70px; }
            .header-container { flex-wrap: wrap; }
            .hamburger { display: block; }
            nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease-out;
            }
            nav.active { max-height: 300px; margin-top: 15px; }
            nav ul {
                flex-direction: column;
                gap: 0;
            }
            nav li { width: 100%; }
            nav a {
                display: block;
                padding: 12px 15px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.5rem; }
        }