* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a365d; 
            --secondary-color: #c53030; 
            --accent-color: #f6ad55; 
            --light-bg: #f7fafc;
            --dark-text: #2d3748;
            --light-text: #4a5568;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: var(--secondary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: var(--primary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .section-padding {
            padding: 3rem 0;
        }
        .text-center {
            text-align: center;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--accent-color);
        }
        .my-logo:hover {
            text-decoration: none;
            color: white;
            opacity: 0.9;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-list a {
            color: white;
            font-weight: 600;
            font-size: 1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-list a:hover {
            text-decoration: none;
            color: var(--accent-color);
        }
        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-color);
            transition: width 0.3s ease;
        }
        .nav-list a:hover::after {
            width: 100%;
        }
        .search-box {
            margin-left: 1.5rem;
            display: flex;
        }
        .search-box input {
            padding: 0.5rem 1rem;
            border: none;
            border-radius: 4px 0 0 4px;
            min-width: 200px;
        }
        .search-box button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 0 4px 4px 0;
            padding: 0.5rem 1rem;
            cursor: pointer;
        }
        .search-box button:hover {
            background-color: #b91c1c;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
            background: none;
            border: none;
            padding: 0.5rem;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: white;
            border-radius: 2px;
            transition: var(--transition);
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb-list {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            font-size: 0.9rem;
        }
        .breadcrumb-list li {
            display: flex;
            align-items: center;
            margin-bottom: 0;
        }
        .breadcrumb-list li:not(:last-child)::after {
            content: '>';
            margin-left: 0.5rem;
            color: var(--light-text);
        }
        main {
            background-color: white;
        }
        .article-header {
            padding: 2.5rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            color: var(--light-text);
            font-size: 0.95rem;
        }
        .last-updated i {
            color: var(--secondary-color);
            margin-right: 0.3rem;
        }
        .article-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .article-content {
                grid-template-columns: 1fr;
            }
        }
        .content-area {
            font-size: 1.1rem;
        }
        .sidebar {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }
        .related-links {
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .related-links a {
            display: block;
            font-weight: 600;
        }
        h2, h3, h4 {
            color: var(--primary-color);
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--secondary-color);
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.6rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--light-text);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 2rem;
        }
        .highlight-box {
            background-color: #fffaf0;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .info-tip {
            display: inline-flex;
            align-items: center;
            background-color: #e6f7ff;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin: 0.5rem 0;
            font-size: 0.95rem;
        }
        .info-tip i {
            color: #1890ff;
            margin-right: 0.5rem;
        }
        .img-container {
            margin: 2rem auto;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 800px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--light-text);
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            text-align: center;
            border-top: 4px solid var(--secondary-color);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stat-label {
            font-size: 1rem;
            color: var(--light-text);
            margin-top: 0.5rem;
        }
        .user-feedback {
            background-color: var(--light-bg);
            padding: 2rem;
            border-radius: 8px;
            margin: 3rem 0;
        }
        .feedback-form {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        @media (max-width: 768px) {
            .feedback-form {
                grid-template-columns: 1fr;
            }
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars label:hover,
        .rating-stars label:hover ~ label {
            color: #ffc107;
        }
        .rating-stars input:checked ~ label {
            color: #ffc107;
        }
        .full-width {
            grid-column: 1 / -1;
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .site-footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
            display: inline-block;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e0;
        }
        .footer-links a:hover {
            color: white;
            text-decoration: none;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1rem;
            margin-bottom: 1rem;
            border-radius: 4px;
            font-weight: 600;
        }
        friend-link a {
            color: var(--accent-color);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #a0aec0;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .nav-list, .search-box {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-nav-active .nav-list,
            .mobile-nav-active .search-box {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--primary-color);
                padding: 1.5rem;
                box-shadow: 0 5px 10px rgba(0,0,0,0.1);
                gap: 1rem;
            }
            .nav-list {
                flex-direction: column;
            }
            .search-box {
                margin-left: 0;
                order: -1;
            }
            .search-box input {
                min-width: auto;
                flex-grow: 1;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 576px) {
            .article-header h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }