* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #222;
            background: linear-gradient(135deg, #f5f7fa 0%, #f0f4f8 100%);
            background-attachment: fixed;
            max-width: 1200px;
            margin: 0 auto;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.05);
        }
        h1, h2, h3, h4 {
            font-family: Georgia, 'Times New Roman', Times, serif;
            color: #1a365d;
            margin-bottom: 1rem;
            font-weight: 700;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 4px solid #e53e3e;
            padding-bottom: 0.5rem;
            margin-top: 1.5rem;
        }
        h2 {
            font-size: 2.1rem;
            margin-top: 2.5rem;
            padding-left: 0.75rem;
            border-left: 5px solid #4299e1;
        }
        h3 {
            font-size: 1.7rem;
            color: #2d3748;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #4a5568;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        a {
            color: #2b6cb0;
            text-decoration: none;
            transition: color 0.3s, background-color 0.3s;
        }
        a:hover {
            color: #e53e3e;
            text-decoration: underline;
        }
        strong {
            color: #2d3748;
            font-weight: 700;
        }
        em {
            color: #4a5568;
        }
        .site-header {
            background: linear-gradient(90deg, #1a365d 0%, #2d3748 100%);
            color: white;
            padding: 1.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            background: linear-gradient(to right, #fbd38d, #fc8181);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .my-logo i {
            font-size: 2rem;
            -webkit-text-fill-color: #fbd38d;
        }
        .search-form {
            display: flex;
            margin: 1rem auto;
            max-width: 500px;
            flex: 1 1 300px;
            margin-left: 2rem;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.85rem 1.2rem;
            border: none;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            background: rgba(255, 255, 255, 0.15);
            color: white;
        }
        .search-input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }
        .search-button {
            background: #e53e3e;
            color: white;
            border: none;
            padding: 0.85rem 1.5rem;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            transition: background 0.3s;
            font-weight: 600;
        }
        .search-button:hover {
            background: #c53030;
        }
        .main-nav {
            background: #2d3748;
            padding: 0 2rem;
        }
        .nav-list {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            justify-content: center;
        }
        .nav-item {
            position: relative;
        }
        .nav-link {
            color: #e2e8f0;
            padding: 1.1rem 1.5rem;
            display: inline-block;
            font-weight: 500;
            transition: all 0.3s;
        }
        .nav-link:hover {
            background-color: #4a5568;
            color: #fbd38d;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background: #edf2f7;
            padding: 0.8rem 2rem;
            font-size: 0.95rem;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb a {
            color: #4a5568;
        }
        .breadcrumb a:hover {
            color: #2b6cb0;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2rem;
            background-color: white;
        }
        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            min-height: 2000px; 
        }
        .sidebar {
            background: #f7fafc;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: #2d3748;
            font-size: 1.4rem;
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #cbd5e0;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
            padding-left: 0.5rem;
            border-left: 3px solid #4299e1;
        }
        .info-box {
            background: linear-gradient(145deg, #e6fffa, #ebf8ff);
            border-left: 6px solid #38b2ac;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.04);
        }
        .warning-box {
            background: linear-gradient(145deg, #fed7d7, #fff5f5);
            border-left: 6px solid #e53e3e;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transition: transform 0.4s ease;
        }
        .article-image:hover {
            transform: scale(1.01);
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .data-table th, .data-table td {
            border: 1px solid #cbd5e0;
            padding: 1rem;
            text-align: left;
        }
        .data-table th {
            background-color: #2d3748;
            color: white;
            font-weight: 600;
        }
        .data-table tr:nth-child(even) {
            background-color: #f7fafc;
        }
        .data-table tr:hover {
            background-color: #ebf8ff;
        }
        .user-interaction {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #e2e8f0;
        }
        .interaction-title {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: #2d3748;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #4a5568;
        }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.85rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-input:focus, .form-textarea:focus {
            border-color: #4299e1;
            outline: none;
            box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
        }
        .form-textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star:hover,
        .star.active {
            color: #f6ad55;
        }
        .submit-button {
            background: linear-gradient(90deg, #38a169, #48bb78);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        .submit-button:hover {
            background: linear-gradient(90deg, #2f855a, #38a169);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(56, 161, 105, 0.3);
        }
        .site-footer {
            background: #1a202c;
            color: #a0aec0;
            padding: 3rem 2rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #fbd38d;
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.75rem;
            color: #90cdf4;
        }
        friend-link:hover {
            color: #63b3ed;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.95rem;
            color: #718096;
        }
        .last-updated {
            background: #e53e3e;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            display: inline-block;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.9rem; }
            .site-header { flex-direction: column; align-items: stretch; }
            .search-form { margin: 1rem 0; max-width: 100%; }
            .main-nav { padding: 0; }
            .nav-list { flex-direction: column; display: none; }
            .nav-list.active { display: flex; }
            .nav-link { padding: 1rem; border-bottom: 1px solid #4a5568; }
            .hamburger { display: block; align-self: flex-end; margin-top: -3.5rem; }
        }
        @media (max-width: 576px) {
            .main-content, .site-header, .breadcrumb { padding-left: 1rem; padding-right: 1rem; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
        }