:root {
            --primary: #0056A7;
            --secondary: #EF3340;
            --accent: #00B2A9;
            --dark: #1C1C1C;
            --light: #F5F5F5;
            --gray: #6C757D;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --border-radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul, ol {
            list-style-position: inside;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 900;
            display: flex;
            align-items: center;
            gap: 10px;
            color: white;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .logo i {
            color: var(--secondary);
        }
        .search-form {
            display: flex;
            flex: 0 1 400px;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 20px;
            border: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-button {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-button:hover {
            background-color: #d32f2f;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .main-nav {
            background-color: rgba(255,255,255,0.05);
            backdrop-filter: blur(10px);
            margin-top: 1rem;
        }
        .nav-list {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 0;
        }
        .nav-list li {
            list-style: none;
        }
        .nav-list a {
            display: block;
            padding: 15px 25px;
            font-weight: 600;
            position: relative;
        }
        .nav-list a:hover,
        .nav-list a.active {
            background-color: rgba(255,255,255,0.1);
            color: var(--accent);
        }
        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: var(--transition);
            transform: translateX(-50%);
        }
        .nav-list a:hover::after {
            width: 80%;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--light);
            border-bottom: 1px solid #eaeaea;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            gap: 5px;
        }
        .breadcrumb li {
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 10px;
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        main {
            padding: 40px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 40px;
            border-bottom: 2px solid var(--accent);
            padding-bottom: 20px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .meta {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .meta i {
            margin-right: 5px;
            color: var(--accent);
        }
        h2 {
            font-size: 2rem;
            color: var(--dark);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px dashed #ddd;
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--secondary);
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--primary);
            background: #f0f8ff;
            padding: 20px;
            border-left: 5px solid var(--accent);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-bottom: 30px;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(0, 178, 169, 0.1) 0%, transparent 100%);
            padding: 25px;
            border-radius: var(--border-radius);
            border: 1px solid rgba(0, 178, 169, 0.3);
            margin: 30px 0;
        }
        .highlight strong {
            color: var(--secondary);
        }
        .internal-links {
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        .internal-links h4 {
            margin-top: 0;
        }
        .internal-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
            margin-top: 15px;
        }
        .internal-links li {
            list-style: none;
            padding: 5px 0;
        }
        .internal-links a {
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .internal-links a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        .featured-image {
            margin: 40px 0;
            text-align: center;
        }
        .featured-image img {
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 0 auto 15px;
        }
        .caption {
            font-style: italic;
            color: var(--gray);
            font-size: 0.9rem;
            text-align: center;
        }
        blockquote {
            font-style: italic;
            color: var(--gray);
            border-left: 4px solid var(--accent);
            padding-left: 20px;
            margin: 30px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--accent);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .stat-card h4 {
            margin: 0 0 10px;
            color: var(--dark);
        }
        .stat-card p {
            margin: 0;
            color: var(--gray);
        }
        aside {
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-top: 0;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        .quick-links ul {
            margin-top: 15px;
        }
        .quick-links li {
            list-style: none;
            margin-bottom: 10px;
        }
        .quick-links a {
            display: block;
            padding: 12px 15px;
            background: var(--light);
            border-radius: var(--border-radius);
            border-left: 4px solid var(--primary);
        }
        .quick-links a:hover {
            background: #e3f2fd;
            border-left-color: var(--secondary);
        }
        .user-interaction {
            margin: 50px 0;
            padding: 30px;
            background: var(--light);
            border-radius: var(--border-radius);
        }
        .user-interaction h2 {
            text-align: center;
            margin-top: 0;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }
        .interaction-form {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .interaction-form h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 178, 169, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .stars {
            display: flex;
            gap: 5px;
            direction: rtl;
        }
        .stars input {
            display: none;
        }
        .stars label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .stars label:hover,
        .stars label:hover ~ label,
        .stars input:checked ~ label {
            color: #ffc107;
        }
        .submit-button {
            background: linear-gradient(to right, var(--primary), var(--accent));
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            width: 100%;
        }
        .submit-button:hover {
            background: linear-gradient(to right, #004a94, #00a098);
            box-shadow: 0 6px 20px rgba(0, 86, 167, 0.3);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 900;
            margin-bottom: 20px;
            color: white;
        }
        .footer-about p {
            color: #bbb;
            margin-bottom: 20px;
        }
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            font-size: 1.2rem;
        }
        .social-links a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links ul li {
            list-style: none;
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #bbb;
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin: 20px 0;
            padding: 15px;
            background: rgba(255,255,255,0.05);
            border-radius: var(--border-radius);
            text-align: center;
        }
        friend-link a {
            color: var(--accent);
            font-weight: 600;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            color: #bbb;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            aside {
                position: static;
            }
            .nav-list {
                gap: 5px;
            }
            .nav-list a {
                padding: 12px 15px;
                font-size: 0.95rem;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                align-items: flex-start;
                gap: 20px;
            }
            .search-form {
                width: 100%;
                order: 3;
            }
            .hamburger {
                display: block;
                position: absolute;
                right: 20px;
                top: 20px;
            }
            .main-nav {
                display: none;
                margin-top: 20px;
            }
            .main-nav.active {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                align-items: stretch;
            }
            .nav-list a {
                padding: 15px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .article-content {
                padding: 20px;
            }
            .meta {
                flex-direction: column;
                gap: 5px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }