* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2c3e50; text-decoration: none; transition: color 0.3s ease, background-color 0.3s ease; }
        a:hover { color: #3498db; }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: 'Georgia', serif; color: #2c3e50; margin-bottom: 1rem; font-weight: 700; line-height: 1.3; }
        h1 { font-size: 2.8rem; margin-top: 2rem; text-align: center; border-bottom: 4px solid #3498db; padding-bottom: 1rem; }
        h2 { font-size: 2.2rem; margin-top: 2.5rem; padding-left: 0.75rem; border-left: 5px solid #e74c3c; }
        h3 { font-size: 1.8rem; margin-top: 2rem; color: #2980b9; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: #16a085; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; color: #555; font-weight: 300; margin-bottom: 2rem; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; }
        .term { font-style: italic; color: #8e44ad; }
        .strong { font-weight: 700; color: #c0392b; }
        .last-updated { font-size: 0.9rem; color: #7f8c8d; text-align: right; margin-bottom: 1rem; font-style: italic; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        main { flex: 1; padding: 2rem 0; }
        header { background: linear-gradient(90deg, #1a2980, #26d0ce); color: white; box-shadow: 0 4px 12px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
        .header-container { display: flex; justify-content: space-between; align-items: center; padding: 1rem 20px; }
        .my-logo { font-family: 'Arial Black', sans-serif; font-size: 1.8rem; color: white; text-decoration: none; display: flex; align-items: center; }
        .my-logo i { margin-right: 10px; color: #f1c40f; }
        .my-logo:hover { color: #ecf0f1; }
        .desktop-nav { display: flex; }
        .desktop-nav a { color: white; padding: 0.75rem 1.2rem; margin-left: 0.5rem; border-radius: 4px; font-weight: 600; }
        .desktop-nav a:hover { background-color: rgba(255,255,255,0.2); }
        .mobile-nav-toggle { display: none; font-size: 1.8rem; background: none; border: none; color: white; cursor: pointer; }
        .mobile-nav { display: none; flex-direction: column; background-color: #2c3e50; padding: 1rem; position: absolute; top: 100%; left: 0; width: 100%; box-shadow: 0 5px 10px rgba(0,0,0,0.2); }
        .mobile-nav.active { display: flex; }
        .mobile-nav a { color: white; padding: 0.8rem; border-bottom: 1px solid #34495e; }
        .mobile-nav a:last-child { border-bottom: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav-toggle { display: block; }
        }
        .breadcrumb { padding: 1rem 20px; background-color: #ecf0f1; font-size: 0.9rem; }
        .breadcrumb a { color: #3498db; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { color: #7f8c8d; }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin-top: 2rem;
        }
        @media (max-width: 992px) {
            .content-grid { grid-template-columns: 1fr; }
        }
        article { background-color: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
        aside { background-color: white; padding: 1.5rem; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.06); align-self: start; position: sticky; top: 120px; }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style: none; }
        .related-links li { margin-bottom: 0.8rem; padding-bottom: 0.8rem; border-bottom: 1px dashed #eee; }
        .related-links a { display: block; padding: 0.5rem; border-radius: 4px; }
        .related-links a:hover { background-color: #f8f9fa; color: #2980b9; }
        .related-links i { margin-right: 8px; color: #3498db; }
        .featured-img { margin: 2.5rem 0; text-align: center; }
        .featured-img img { border-radius: 10px; box-shadow: 0 8px 25px rgba(0,0,0,0.15); border: 5px solid white; max-height: 500px; object-fit: cover; width: 100%; }
        .img-caption { font-size: 0.9rem; color: #666; margin-top: 0.5rem; font-style: italic; }
        .interactive-module { background: linear-gradient(145deg, #f8f9fa, #e9ecef); padding: 2rem; border-radius: 10px; margin: 3rem 0; border-left: 5px solid #3498db; }
        .module-title { font-size: 1.6rem; color: #2c3e50; margin-bottom: 1.5rem; display: flex; align-items: center; }
        .module-title i { margin-right: 10px; color: #3498db; }
        .form-group { margin-bottom: 1.2rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #444; }
        .form-control { width: 100%; padding: 0.8rem 1rem; border: 1px solid #bdc3c7; border-radius: 6px; 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); }
        textarea.form-control { min-height: 120px; resize: vertical; }
        .btn { display: inline-block; background: linear-gradient(to right, #3498db, #2980b9); color: white; padding: 0.9rem 1.8rem; border: none; border-radius: 6px; cursor: pointer; font-size: 1rem; font-weight: 600; transition: all 0.3s ease; }
        .btn:hover { background: linear-gradient(to right, #2980b9, #1c6ea4); transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
        .rating { display: flex; align-items: center; margin-bottom: 1rem; }
        .rating input { display: none; }
        .rating label { font-size: 1.8rem; color: #ddd; cursor: pointer; margin-right: 5px; }
        .rating input:checked ~ label { color: #f1c40f; }
        .rating label:hover,
        .rating label:hover ~ label { color: #f1c40f; }
        footer { background: linear-gradient(90deg, #2c3e50, #34495e); 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; }
        .footer-section h4 { color: #f1c40f; border-bottom: 2px solid #3498db; padding-bottom: 0.5rem; margin-bottom: 1.5rem; }
        friend-link { display: block; margin-bottom: 0.8rem; }
        friend-link a { color: #bdc3c7; }
        friend-link a:hover { color: white; text-decoration: underline; }
        .copyright { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid #4a6572; font-size: 0.9rem; color: #95a5a6; }