* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-color: #1a237e;
            --secondary-color: #ff5722;
            --accent-color: #4caf50;
            --dark-color: #121212;
            --light-color: #f5f5f7;
            --text-color: #333;
            --text-light: #777;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f9f9f9;
            color: var(--text-color);
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--dark-color);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            color: white;
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            color: var(--secondary-color);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--secondary-color);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: width 0.3s ease;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            background-color: var(--dark-color);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: block;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav li {
            margin-bottom: 1rem;
        }
        .mobile-nav a {
            color: white;
            font-size: 1.1rem;
            display: block;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #eee;
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        .breadcrumb span {
            color: var(--text-light);
        }
        .breadcrumb .separator {
            margin: 0 0.5rem;
            color: #999;
        }
        main {
            flex: 1;
            padding: 2rem 0;
        }
        article {
            background-color: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }
        h1 {
            color: var(--primary-color);
            font-size: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        h2 {
            color: var(--dark-color);
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }
        h3 {
            color: var(--primary-color);
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
        }
        .intro {
            font-size: 1.1rem;
            color: var(--text-light);
            font-style: italic;
            border-left: 4px solid var(--secondary-color);
            padding-left: 1rem;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff8e1;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid var(--secondary-color);
            margin: 2rem 0;
        }
        .highlight strong {
            color: var(--secondary-color);
        }
        .image-container {
            margin: 2rem auto;
            text-align: center;
        }
        .image-container img {
            border-radius: 8px;
            box-shadow: var(--shadow);
            max-height: 500px;
            object-fit: cover;
        }
        .image-caption {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 0.5rem;
            font-style: italic;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        blockquote {
            background: #e3f2fd;
            border-left: 5px solid var(--primary-color);
            margin: 1.5rem 0;
            padding: 1.5rem;
            font-style: italic;
            border-radius: 0 8px 8px 0;
        }
        .key-term {
            font-weight: bold;
            color: var(--primary-color);
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3em;
        }
        .search-widget {
            background-color: var(--light-color);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
            text-align: center;
        }
        .search-widget h3 {
            margin-top: 0;
            color: var(--dark-color);
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 1rem auto 0;
        }
        .search-input {
            flex: 1;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-button:hover {
            background-color: var(--secondary-color);
        }
        .interactive-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 3rem 0;
        }
        @media (max-width: 768px) {
            .interactive-section {
                grid-template-columns: 1fr;
            }
        }
        .rating-widget, .comment-widget {
            background-color: var(--light-color);
            padding: 1.5rem;
            border-radius: 10px;
        }
        .rating-widget h3, .comment-widget h3 {
            margin-top: 0;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star.active, .star:hover {
            color: #ffc107;
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        label {
            font-weight: 600;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .submit-button {
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 0.8rem;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            align-self: flex-start;
        }
        .submit-button:hover {
            background-color: #388e3c;
        }
        .footer-links {
            background-color: #2c2c2c;
            padding: 2rem 0;
        }
        .web-link-container {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1rem;
        }
        @media (max-width: 992px) {
            .web-link-container {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        @media (max-width: 576px) {
            .web-link-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        .web-link {
            background-color: #3a3a3a;
            padding: 1rem;
            border-radius: 6px;
            text-align: center;
        }
        .web-link a {
            color: white;
            font-size: 0.9rem;
        }
        .web-link:hover {
            background-color: var(--primary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 2rem 0;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
        }
        .social-links {
            display: flex;
            gap: 1.5rem;
            font-size: 1.5rem;
        }
        .social-links a {
            color: white;
        }
        .social-links a:hover {
            color: var(--secondary-color);
        }
        .copyright {
            color: #aaa;
            font-size: 0.9rem;
            line-height: 1.5;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            article {
                padding: 1.5rem;
            }
            .container {
                padding: 0 15px;
            }
        }