* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-green: #6aaa64;
            --secondary-yellow: #c9b458;
            --dark-gray: #787c7e;
            --light-gray: #d3d6da;
            --bg-color: #ffffff;
            --text-color: #1a1a1a;
            --accent-color: #3a7bd5;
            --border-radius: 8px;
            --transition: all 0.3s ease;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--text-color);
            background-color: var(--bg-color);
            font-size: 18px;
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Georgia', serif;
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-green);
            text-decoration: none;
            letter-spacing: 2px;
            position: relative;
            padding: 0.5rem 1rem;
        }
        .my-logo::after {
            content: "USA";
            font-size: 0.8rem;
            position: absolute;
            top: -5px;
            right: 0;
            color: var(--accent-color);
            font-weight: 600;
        }
        .my-logo:hover {
            color: #5a9954;
            transform: scale(1.05);
            transition: var(--transition);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: var(--text-color);
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover {
            background-color: var(--light-gray);
            color: var(--primary-green);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            width: 0;
            height: 3px;
            background-color: var(--primary-green);
            transition: var(--transition);
            transform: translateX(-50%);
        }
        .nav-desktop a:hover::after {
            width: 80%;
        }
        .hamburger-menu {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
        }
        .hamburger-menu span {
            width: 25px;
            height: 3px;
            background-color: var(--primary-green);
            transition: var(--transition);
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: white;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            box-shadow: var(--shadow);
            padding: 1rem;
            z-index: 999;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            padding: 1rem;
            text-decoration: none;
            color: var(--text-color);
            border-bottom: 1px solid var(--light-gray);
            font-weight: 600;
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .nav-mobile a:hover {
            background-color: var(--light-gray);
            color: var(--primary-green);
        }
        .breadcrumb {
            max-width: var(--max-width);
            margin: 1rem auto 0;
            padding: 0 2rem;
            font-size: 0.9rem;
            color: var(--dark-gray);
        }
        .breadcrumb a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 2rem;
        }
        article {
            background-color: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 3rem;
            color: var(--primary-green);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid var(--secondary-yellow);
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--accent-color);
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light-gray);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-green);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--dark-gray);
            margin: 1.5rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--accent-color);
            background-color: #f0f8ff;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--accent-color);
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border: 2px solid var(--secondary-yellow);
            margin: 2rem 0;
        }
        .expert-tip {
            background-color: #f0f9f0;
            border-left: 5px solid var(--primary-green);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .expert-tip i {
            color: var(--primary-green);
            margin-right: 10px;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature-card {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--light-gray);
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            border-color: var(--primary-green);
        }
        .feature-card i {
            font-size: 2.5rem;
            color: var(--primary-green);
            margin-bottom: 1rem;
        }
        .search-container {
            background-color: #f8f9fa;
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            text-align: center;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem;
            border: 2px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--primary-green);
            box-shadow: 0 0 0 3px rgba(106, 170, 100, 0.2);
        }
        .search-button {
            background-color: var(--primary-green);
            color: white;
            border: none;
            padding: 1rem 1.5rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-button:hover {
            background-color: #5a9954;
            transform: scale(1.05);
        }
        .user-feedback {
            margin: 3rem 0;
            padding: 2rem;
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
        }
        .comment-form, .rating-form {
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-color);
        }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.8rem;
            border: 2px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary-green);
            box-shadow: 0 0 0 3px rgba(106, 170, 100, 0.2);
        }
        .form-textarea {
            min-height: 150px;
            resize: vertical;
        }
        .submit-button {
            background-color: var(--primary-green);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            font-size: 1rem;
        }
        .submit-button:hover {
            background-color: #5a9954;
            transform: scale(1.05);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            font-size: 2rem;
            color: var(--light-gray);
            transition: var(--transition);
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--secondary-yellow);
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--dark-gray);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .content-link {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 2px dotted var(--accent-color);
            transition: var(--transition);
        }
        .content-link:hover {
            color: var(--primary-green);
            border-bottom-style: solid;
            background-color: rgba(106, 170, 100, 0.1);
        }
        footer {
            background-color: #2c3e50;
            color: white;
            padding: 3rem 2rem 1.5rem;
        }
        .footer-content {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid var(--primary-green);
            padding-bottom: 0.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--primary-green);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255, 255, 255, 0.1);
            padding: 1rem;
            border-radius: var(--border-radius);
            margin: 1rem 0;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        friend-link a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        friend-link i {
            color: var(--primary-green);
        }
        .copyright {
            max-width: var(--max-width);
            margin: 0 auto;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .header-container {
                padding: 1rem;
            }
            main, .breadcrumb {
                padding: 0 1rem;
            }
            article {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .hamburger-menu {
                display: flex;
            }
            .search-form {
                flex-direction: column;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            body {
                font-size: 16px;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            article {
                padding: 1rem;
            }
            .search-container, .user-feedback {
                padding: 1rem;
            }
            footer {
                padding: 2rem 1rem 1rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 800; }
        .text-green { color: var(--primary-green); }
        .text-yellow { color: var(--secondary-yellow); }
        .mb-3 { margin-bottom: 3rem; }
        .mt-3 { margin-top: 3rem; }
        .emoji { font-size: 1.2em; }
        .wordle-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 8px;
            max-width: 400px;
            margin: 2rem auto;
        }
        .wordle-cell {
            aspect-ratio: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            font-weight: 800;
            border: 3px solid var(--light-gray);
            border-radius: 5px;
            transition: var(--transition);
        }
        .wordle-cell.correct {
            background-color: var(--primary-green);
            color: white;
            border-color: var(--primary-green);
        }
        .wordle-cell.present {
            background-color: var(--secondary-yellow);
            color: white;
            border-color: var(--secondary-yellow);
        }
        .wordle-cell.absent {
            background-color: var(--dark-gray);
            color: white;
            border-color: var(--dark-gray);
        }