* { 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: #2c3e50;
            background-color: #f8f9fa;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a { color: #2980b9; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1a5276; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5em; margin-bottom: 1.5rem; }
        h1, h2, h3, h4 { color: #1a252f; margin-bottom: 1rem; font-weight: 700; line-height: 1.3; }
        h1 { font-size: 2.8rem; margin-top: 2rem; border-bottom: 4px solid #16a085; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; margin-top: 3rem; color: #2c3e50; padding-left: 0.5rem; border-left: 5px solid #e74c3c; }
        h3 { font-size: 1.8rem; margin-top: 2.5rem; color: #34495e; }
        h4 { font-size: 1.4rem; margin-top: 2rem; color: #7f8c8d; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; color: #5a6268; font-weight: 300; }
        .highlight { background-color: #fffacd; padding: 0.2em 0.5em; border-radius: 3px; }
        .emoji { font-size: 1.2em; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        main { flex: 1; }
        .site-header { background-color: #1a252f; color: white; padding: 1rem 0; position: sticky; top: 0; 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: #16a085; text-transform: uppercase; letter-spacing: 1px;
            background: linear-gradient(90deg, #16a085, #2ecc71); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        .my-logo:hover { opacity: 0.9; }
        .desktop-nav ul { display: flex; list-style: none; gap: 2rem; }
        .desktop-nav a { color: #ecf0f1; font-weight: 500; padding: 0.5rem 0; position: relative; }
        .desktop-nav a:after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background-color: #16a085; transition: width 0.3s; }
        .desktop-nav a:hover:after { width: 100%; }
        .hamburger { display: none; font-size: 1.8rem; background: none; border: none; color: white; cursor: pointer; }
        .mobile-nav { display: none; background-color: #2c3e50; position: absolute; top: 100%; left: 0; width: 100%; padding: 1rem; box-shadow: 0 5px 10px rgba(0,0,0,0.2); }
        .mobile-nav.active { display: block; }
        .mobile-nav ul { list-style: none; }
        .mobile-nav li { margin-bottom: 1rem; }
        .mobile-nav a { color: white; display: block; padding: 0.8rem; border-radius: 4px; }
        .mobile-nav a:hover { background-color: #16a085; }
        .breadcrumb { background-color: #ecf0f1; padding: 1rem; margin: 1rem 0; border-radius: 5px; font-size: 0.9rem; }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #34495e; }
        .breadcrumb span { color: #2c3e50; }
        .article-content { background-color: white; padding: 2.5rem; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); margin: 2rem 0; }
        .featured-img { margin: 2rem 0; border-radius: 10px; overflow: hidden; box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
        .img-caption { text-align: center; font-style: italic; color: #7f8c8d; margin-top: 0.5rem; font-size: 0.95rem; }
        .module {
            background-color: #f1f8ff; border-left: 5px solid #3498db; padding: 1.5rem; margin: 2.5rem 0; border-radius: 0 8px 8px 0;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .module:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(52, 152, 219, 0.15); }
        .module h3 { color: #2980b9; margin-top: 0; }
        .form-group { margin-bottom: 1.5rem; }
        .form-label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #2c3e50; }
        .form-control {
            width: 100%; padding: 0.75rem; border: 1px solid #bdc3c7; border-radius: 5px; font-size: 1rem;
            transition: border-color 0.3s, box-shadow 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; padding: 0.8rem 1.8rem; background-color: #16a085; color: white; border: none;
            border-radius: 5px; cursor: pointer; font-weight: 600; font-size: 1rem; transition: background-color 0.3s, transform 0.2s;
        }
        .btn:hover { background-color: #138d75; transform: scale(1.03); }
        .btn:active { transform: scale(0.98); }
        .rating-stars { color: #f39c12; font-size: 1.5rem; margin: 0.5rem 0; cursor: pointer; }
        .rating-stars .star:hover { transform: scale(1.2); }
        .site-footer { background-color: #1a252f; color: #bdc3c7; padding: 3rem 0 1.5rem; margin-top: 3rem; }
        .footer-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
        .footer-section h4 { color: #ecf0f1; margin-bottom: 1.5rem; font-size: 1.3rem; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #95a5a6; }
        .footer-links a:hover { color: #16a085; }
        friend-link {
            display: inline-block; background-color: #2c3e50; color: #ecf0f1; padding: 0.5rem 1rem; margin: 0.3rem; border-radius: 4px;
            font-size: 0.9rem;
        }
        friend-link:hover { background-color: #16a085; }
        .copyright { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid #34495e; color: #7f8c8d; font-size: 0.9rem; }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            .header-container { flex-wrap: wrap; }
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            .article-content { padding: 1.5rem; }
            .module { padding: 1.2rem; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.8rem; }
        }
        @media (max-width: 576px) {
            .container { padding: 0 15px; }
            .footer-container { grid-template-columns: 1fr; }
            .btn { width: 100%; }
        }
        .text-center { text-align: center; }
        .mt-4 { margin-top: 2rem; }
        .mb-4 { margin-bottom: 2rem; }
        .updated { font-style: italic; color: #7f8c8d; font-size: 0.9rem; background-color: #ecf0f1; padding: 0.5rem; border-radius: 4px; display: inline-block; }