* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        h1, h2, h3, h4 { color: #2c3e50; margin-bottom: 1rem; font-weight: 700; }
        h1 { font-size: 2.8rem; line-height: 1.2; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; border-bottom: 3px solid #3498db; padding-bottom: 0.5rem; margin-top: 2.5rem; }
        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; text-align: justify; }
        a { color: #3498db; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        strong { color: #e74c3c; font-weight: 700; }
        em { font-style: italic; color: #7f8c8d; }
        .container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
            margin-top: 20px;
        }
        @media (max-width: 992px) {
            .container { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 10px 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            margin-bottom: 2rem;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-family: 'Georgia', serif;
            font-size: 2.5rem;
            font-weight: 900;
            color: #f1c40f;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .my-logo i { margin-right: 10px; font-size: 2.2rem; }
        .my-logo:hover { color: #fff; }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            margin-bottom: 1.5rem;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #3498db; }
        .breadcrumb span { color: #95a5a6; }
        .main-nav {
            background-color: #34495e;
            border-radius: 8px;
            overflow: hidden;
        }
        .nav-list {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-list li { flex: 1; min-width: 140px; }
        .nav-list a {
            display: block;
            color: white;
            padding: 1rem 1.5rem;
            text-align: center;
            border-right: 1px solid #3d566e;
            font-weight: 600;
        }
        .nav-list a:hover {
            background-color: #3498db;
            color: #fff;
        }
        .nav-list li:last-child a { border-right: none; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-list {
                flex-direction: column;
                display: none;
            }
            .nav-list.active { display: flex; }
            .nav-list li { width: 100%; }
            .nav-list a { border-right: none; border-bottom: 1px solid #3d566e; text-align: left; }
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .intro { font-size: 1.2rem; color: #2c3e50; background: #f1f8ff; padding: 1.5rem; border-left: 5px solid #3498db; margin-bottom: 2rem; }
        .sidebar {
            background: white;
            padding: 1.8rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 20px;
        }
        .widget { margin-bottom: 2.5rem; }
        .widget h3 { font-size: 1.5rem; margin-top: 0; border-bottom: 2px solid #eee; padding-bottom: 0.7rem; }
        .form-group { margin-bottom: 1.2rem; }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .btn {
            display: inline-block;
            background: #3498db;
            color: white;
            padding: 0.9rem 1.8rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: background 0.3s, transform 0.2s;
        }
        .btn:hover {
            background: #2980b9;
            transform: translateY(-2px);
        }
        .btn-block { width: 100%; }
        .rating-widget { text-align: center; }
        .stars { margin: 1rem 0; }
        .star { font-size: 2rem; color: #ddd; cursor: pointer; margin: 0 3px; transition: color 0.3s; }
        .star.active, .star:hover { color: #f1c40f; }
        .comment { border-bottom: 1px solid #eee; padding: 1.2rem 0; }
        .comment:last-child { border-bottom: none; }
        .comment-author { font-weight: bold; color: #2c3e50; }
        .comment-date { color: #95a5a6; font-size: 0.9rem; margin-left: 10px; }
        .article-img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 2rem 0;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            display: block;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #7f8c8d;
            margin-top: 0.5rem;
        }
        .resource-links {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .resource-links ul { list-style: none; padding-left: 1rem; }
        .resource-links li { margin-bottom: 0.8rem; }
        .resource-links li:before {
            content: "▶";
            color: #3498db;
            margin-right: 10px;
            font-size: 0.9rem;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            border-radius: 10px 10px 0 0;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section { flex: 1; min-width: 250px; }
        .footer-section h3 { color: #f1c40f; border-bottom: none; font-size: 1.5rem; }
        friend-link {
            display: inline-block;
            background: #3d566e;
            color: #ecf0f1;
            padding: 0.5rem 1rem;
            margin: 0.3rem;
            border-radius: 4px;
            text-decoration: none;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: #3498db;
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3d566e;
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        .text-center { text-align: center; }
        .mt-4 { margin-top: 2rem; }
        .mb-4 { margin-bottom: 2rem; }
        .highlight { background-color: #fffacd; padding: 2px 5px; border-radius: 3px; }