* {
            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: #f8f9fa;
            padding-top: 70px; 
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: #e74c3c; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #c0392b; }
        ul, ol { padding-left: 2em; margin: 1em 0; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
            color: #fff;
            padding: 1rem 0;
            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;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: #f1c40f;
            text-shadow: 3px 3px 0 #e74c3c;
            letter-spacing: -1px;
            font-family: 'Arial Black', sans-serif;
        }
        .my-logo:hover { color: #f39c12; }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li { margin-left: 2rem; }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover {
            color: #f1c40f;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #f1c40f;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #ecf0f1;
            cursor: pointer;
        }
        .breadcrumb {
            background: #ecf0f1;
            padding: 0.8rem 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid #bdc3c7;
        }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #e74c3c; }
        .search-form {
            display: flex;
            max-width: 400px;
            margin: 1.5rem auto 2rem;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.8rem 1rem;
            border: 2px solid #3498db;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
        }
        .search-btn {
            background: #3498db;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #2980b9; }
        .content-area {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem auto;
        }
        @media (max-width: 992px) {
            .content-area { grid-template-columns: 1fr; }
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        h1 {
            color: #2c3e50;
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 5px solid #f1c40f;
            padding-bottom: 0.5rem;
        }
        h2 {
            color: #34495e;
            font-size: 2rem;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #ecf0f1;
        }
        h3 {
            color: #16a085;
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #7f8c8d;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: #555;
            font-weight: 500;
            margin-bottom: 2rem;
        }
        .highlight {
            background: #fff9e6;
            border-left: 5px solid #f1c40f;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tip {
            background: #e8f6f3;
            border-left: 5px solid #1abc9c;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .note {
            background: #ebf5fb;
            border-left: 5px solid #3498db;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-list {
            list-style: none;
            padding-left: 0;
        }
        .feature-list li {
            padding: 0.8rem 0 0.8rem 2.5rem;
            position: relative;
        }
        .feature-list li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #27ae60;
            font-weight: bold;
            font-size: 1.2rem;
        }
        .article-img {
            width: 100%;
            border-radius: 8px;
            margin: 2rem auto;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border: 1px solid #eee;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #7f8c8d;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .content-link {
            font-weight: 600;
            border-bottom: 1px dotted #3498db;
        }
        .user-interaction {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 2px solid #ecf0f1;
        }
        .rating-form, .comment-form {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
        }
        .form-textarea { min-height: 150px; resize: vertical; }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
        }
        .stars .star:hover,
        .stars .star.active { color: #f1c40f; }
        .btn {
            background: #e74c3c;
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 4px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .btn:hover { background: #c0392b; }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .widget-title {
            color: #2c3e50;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #f1c40f;
        }
        .link-list {
            list-style: none;
            padding-left: 0;
        }
        .link-list li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed #ecf0f1;
        }
        .link-list a {
            display: flex;
            align-items: center;
            color: #2c3e50;
        }
        .link-list a:hover { color: #e74c3c; }
        .link-list i {
            margin-right: 10px;
            color: #3498db;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            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-widget h3 {
            color: #f1c40f;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }
        .friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
            color: #bdc3c7;
            border: 1px solid transparent;
            transition: all 0.3s;
        }
        .friend-link:hover {
            background: rgba(241, 196, 15, 0.2);
            color: #f1c40f;
            border-color: #f1c40f;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #95a5a6;
        }
        @media (max-width: 768px) {
            body { padding-top: 60px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.4rem; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #2c3e50;
                padding: 1rem 0;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            }
            .main-nav.active ul { display: flex; }
            .main-nav li { margin: 0; text-align: center; }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav a::after { display: none; }
            .hamburger { display: block; }
            .main-content { padding: 1.5rem; }
            .content-area { gap: 1.5rem; }
        }
        .text-center { text-align: center; }
        .last-updated {
            font-size: 0.9rem;
            color: #7f8c8d;
            margin-bottom: 2rem;
            font-style: italic;
        }