* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f9f9f9;
            padding-top: 80px; 
        }
        a {
            color: #2c5aa0;
            text-decoration: none;
            transition: color 0.3s;
        }
        a:hover {
            color: #e74c3c;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section {
            padding: 40px 0;
        }
        h1, h2, h3, h4 {
            font-family: Georgia, 'Times New Roman', Times, serif;
            color: #2c3e50;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a5276;
            border-bottom: 3px solid #3498db;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2.2rem;
            margin-top: 2.5rem;
            padding-left: 15px;
            border-left: 5px solid #2ecc71;
        }
        h3 {
            font-size: 1.8rem;
            color: #2980b9;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #16a085;
            margin-top: 1.5rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        strong {
            color: #c0392b;
            font-weight: 700;
        }
        em {
            color: #8e44ad;
        }
        .site-header {
            background-color: #1a5276;
            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 {
            font-size: 2.2rem;
            font-weight: 900;
            font-family: 'Courier New', Courier, monospace;
            color: #f1c40f;
            text-shadow: 2px 2px 0 #e74c3c;
        }
        .my-logo a {
            color: inherit;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 25px;
        }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: #3498db;
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 12px 20px;
            margin-bottom: 30px;
            border-radius: 5px;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 10px;
        }
        .breadcrumb li:after {
            content: '>';
            margin-left: 10px;
            color: #7f8c8d;
        }
        .breadcrumb li:last-child:after {
            content: '';
        }
        .breadcrumb a {
            color: #3498db;
        }
        .content-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-layout {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .intro {
            font-size: 1.3rem;
            color: #2c3e50;
            background: #e8f4fc;
            padding: 25px;
            border-radius: 8px;
            margin-bottom: 40px;
            border-left: 5px solid #3498db;
        }
        .featured-image {
            margin: 30px 0;
            text-align: center;
        }
        .featured-image img {
            border-radius: 10px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            margin: 0 auto;
            border: 5px solid #f1c40f;
        }
        .image-caption {
            font-style: italic;
            color: #7f8c8d;
            margin-top: 10px;
            text-align: center;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fff9e6, #ffeaa7);
            border: 2px dashed #f39c12;
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
        }
        .tip {
            background-color: #d5f4e6;
            padding: 20px;
            border-radius: 8px;
            margin: 25px 0;
            border-left: 5px solid #2ecc71;
        }
        .tip i {
            color: #27ae60;
            margin-right: 10px;
        }
        .sidebar {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .widget {
            margin-bottom: 40px;
        }
        .widget-title {
            font-size: 1.5rem;
            color: #1a5276;
            border-bottom: 2px solid #3498db;
            padding-bottom: 10px;
            margin-bottom: 20px;
        }
        .search-form, .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            margin-bottom: 5px;
            font-weight: 600;
            color: #2c3e50;
        }
        input, textarea, select {
            padding: 12px 15px;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        button, .btn {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 14px 20px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 600;
            transition: background 0.3s;
            text-align: center;
        }
        button:hover, .btn:hover {
            background-color: #2980b9;
        }
        .stars {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #f1c40f;
            margin: 10px 0;
        }
        .star {
            cursor: pointer;
        }
        .site-footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
            margin-bottom: 30px;
            padding-right: 20px;
        }
        .footer-title {
            color: #f1c40f;
            font-size: 1.5rem;
            margin-bottom: 20px;
            border-bottom: 2px solid #34495e;
            padding-bottom: 10px;
        }
        friend-link {
            display: block;
            background: #34495e;
            margin: 8px 0;
            padding: 12px 15px;
            border-radius: 5px;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: #3d566e;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid #34495e;
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            body {
                padding-top: 70px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 15px;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
            }
            .main-nav li {
                margin: 10px 0;
            }
            .article-content {
                padding: 25px;
            }
            .sidebar {
                padding: 25px;
            }
        }
        .text-center {
            text-align: center;
        }
        .mb-4 {
            margin-bottom: 2rem;
        }
        .last-updated {
            font-style: italic;
            color: #7f8c8d;
            background: #f8f9fa;
            padding: 10px 15px;
            border-radius: 5px;
            display: inline-block;
            margin-bottom: 30px;
        }