* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        ul, ol {
            list-style-position: inside;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        h1, h2, h3, h4 {
            color: #1a365d;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        h1 {
            font-size: 2.8rem;
            border-left: 6px solid #FF6B35;
            padding-left: 1rem;
            margin-top: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-top: 2.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eaeaea;
        }
        h3 {
            font-size: 1.8rem;
            color: #2d3748;
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 300;
            color: #4a5568;
        }
        .highlight {
            background-color: #fff3cd;
            padding: 1.5rem;
            border-left: 5px solid #ffc107;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .term {
            font-weight: bold;
            color: #e53e3e;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .grid {
            display: grid;
            gap: 2rem;
        }
        .grid-2 {
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        }
        .grid-3 {
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            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;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            color: #FF6B35;
            display: flex;
            align-items: center;
        }
        .logo i {
            margin-right: 10px;
        }
        .main-nav ul {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover {
            color: #FF6B35;
            transform: translateY(-2px);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #FF6B35;
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li {
            margin-right: 0.5rem;
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: #a0aec0;
        }
        .breadcrumb a:hover {
            color: #FF6B35;
        }
        .search-section {
            background: linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
            padding: 3rem 0;
            text-align: center;
            color: white;
            margin-bottom: 3rem;
            border-radius: 12px;
        }
        .search-form {
            max-width: 700px;
            margin: 2rem auto 0;
            display: flex;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            border-radius: 50px;
            overflow: hidden;
        }
        .search-input {
            flex: 1;
            padding: 1.2rem 2rem;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-btn {
            background: #1a365d;
            color: white;
            border: none;
            padding: 0 2.5rem;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 600;
            transition: background 0.3s ease;
        }
        .search-btn:hover {
            background: #FF6B35;
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 3rem;
        }
        .featured-img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 12px;
            margin: 2rem 0;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            margin-top: 0.5rem;
        }
        .content-link {
            color: #3182ce;
            border-bottom: 1px dotted #3182ce;
        }
        .content-link:hover {
            color: #FF6B35;
            border-bottom-style: solid;
        }
        .card {
            background: white;
            border-radius: 10px;
            padding: 1.8rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid #e2e8f0;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .card-title {
            color: #1a365d;
            margin-bottom: 1rem;
            font-size: 1.5rem;
        }
        .card-icon {
            font-size: 2.5rem;
            color: #FF6B35;
            margin-bottom: 1rem;
        }
        .interactive-section {
            margin: 3rem 0;
        }
        .rating-form, .comment-form {
            background: #f8fafc;
            padding: 2rem;
            border-radius: 10px;
            border: 1px solid #e2e8f0;
            margin-bottom: 2rem;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.2s ease;
            margin-right: 5px;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #f6ad55;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: #3182ce;
            box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.2);
        }
        .form-textarea {
            min-height: 150px;
            resize: vertical;
        }
        .submit-btn {
            background: #38a169;
            color: white;
            border: none;
            padding: 0.9rem 2.5rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        .submit-btn:hover {
            background: #2f855a;
        }
        friend-link {
            display: block;
            background: #edf2f7;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
        }
        .friend-links h3 {
            text-align: center;
            margin-bottom: 1.5rem;
        }
        .friend-links ul {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1.5rem;
            list-style: none;
        }
        .friend-links a {
            background: white;
            padding: 0.8rem 1.5rem;
            border-radius: 50px;
            border: 1px solid #cbd5e0;
            transition: all 0.3s ease;
        }
        .friend-links a:hover {
            background: #3182ce;
            color: white;
            border-color: #3182ce;
            transform: scale(1.05);
        }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            color: #FF6B35;
            margin-bottom: 1rem;
        }
        .footer-nav h4 {
            color: #e2e8f0;
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }
        .footer-nav ul {
            list-style: none;
        }
        .footer-nav li {
            margin-bottom: 0.7rem;
        }
        .footer-nav a:hover {
            color: #FF6B35;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            .main-nav ul { gap: 1.5rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                right: -100%;
                background: #1a365d;
                width: 80%;
                height: calc(100vh - 70px);
                transition: right 0.4s ease;
                padding: 2rem;
                box-shadow: -5px 0 15px rgba(0,0,0,0.2);
                z-index: 999;
            }
            .main-nav.active { right: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 1.5rem;
            }
            .header-container { padding: 0 15px; }
            .article-content { padding: 2rem; }
            .search-form { flex-direction: column; border-radius: 12px; }
            .search-input, .search-btn { width: 100%; border-radius: 0; padding: 1rem; }
        }
        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            .container { padding: 0 15px; }
            .highlight { padding: 1rem; }
            .friend-links ul { flex-direction: column; align-items: center; }
        }