:root {
            --primary-green: #4CAF50;
            --zombie-green: #8BC34A;
            --sun-yellow: #FFEB3B;
            --dark-gray: #2E2E2E;
            --light-gray: #f5f5f5;
            --accent-red: #F44336;
            --text-color: #333;
            --line-height: 1.8;
            --spacing-unit: 1rem;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: var(--line-height);
            color: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: calc(var(--spacing-unit) * 1.5);
            color: var(--dark-gray);
        }
        h1 { font-size: 2.8rem; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; border-left: 5px solid var(--primary-green); padding-left: 1rem; margin-top: 3rem; }
        h3 { font-size: 1.8rem; color: var(--zombie-green); margin-top: 2.5rem; }
        h4 { font-size: 1.4rem; margin-top: 2rem; }
        p {
            margin-bottom: var(--spacing-unit);
            text-align: justify;
        }
        a {
            color: var(--primary-green);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-red);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 calc(var(--spacing-unit) * 1.5);
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .italic { font-style: italic; }
        .highlight {
            background-color: var(--sun-yellow);
            padding: 0.2em 0.4em;
            border-radius: 4px;
        }
        .emoji { font-size: 1.2em; }
        .site-header {
            background-color: var(--dark-gray);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: var(--sun-yellow);
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .my-logo:hover {
            color: white;
            text-decoration: none;
        }
        .my-logo span:nth-child(1) { color: var(--primary-green); }
        .my-logo span:nth-child(3) { color: var(--accent-red); }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: var(--border-radius);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: var(--primary-green);
            text-decoration: none;
            color: var(--dark-gray);
        }
        .breadcrumb {
            background-color: var(--light-gray);
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: var(--dark-gray); }
        .breadcrumb a:hover { color: var(--primary-green); }
        .breadcrumb span { margin: 0 0.5rem; color: #888; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .interactive-module {
            background-color: var(--light-gray);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            box-shadow: var(--shadow);
        }
        .module-title {
            margin-top: 0;
            color: var(--dark-gray);
            font-size: 1.8rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-green);
        }
        .btn {
            display: inline-block;
            background-color: var(--primary-green);
            color: white;
            padding: 0.8rem 2rem;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--dark-gray);
            color: var(--sun-yellow);
            text-decoration: none;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            direction: ltr;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label {
            color: var(--sun-yellow);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 3rem 0;
        }
        .article-content {
            min-width: 0;
        }
        .sidebar {
            background-color: var(--light-gray);
            padding: 2rem;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            margin-top: 0;
            font-size: 1.5rem;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar li {
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #ddd;
        }
        .sidebar a {
            color: var(--dark-gray);
            display: block;
        }
        .sidebar a:hover {
            color: var(--primary-green);
            padding-left: 0.5rem;
        }
        .featured-image {
            margin: 2.5rem 0;
            text-align: center;
        }
        .featured-image img {
            box-shadow: var(--shadow);
            margin: 0 auto;
        }
        .image-caption {
            font-size: 0.9rem;
            color: #666;
            margin-top: 0.5rem;
            font-style: italic;
        }
        .related-links {
            background-color: #f9f9f9;
            padding: 1.5rem;
            border-left: 4px solid var(--zombie-green);
            margin: 2rem 0;
        }
        .related-links h4 { margin-top: 0; }
        .related-links ul { list-style: square inside; }
        .related-links li { margin-bottom: 0.5rem; }
        .site-footer {
            background-color: var(--dark-gray);
            color: white;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: var(--sun-yellow);
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section li {
            margin-bottom: 0.8rem;
        }
        .footer-section a {
            color: #ccc;
        }
        .footer-section a:hover {
            color: var(--primary-green);
        }
        friend-link {
            display: block;
            padding: 0.5rem 0;
            border-bottom: 1px dashed #555;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #555;
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0.5rem;
            }
            .main-nav li {
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 0.8rem;
                border: 1px solid #555;
            }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
        }