* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-blue: #0056A8;
            --secondary-orange: #FF6B00;
            --dark-bg: #0F1C2D;
            --light-bg: #F5F7FA;
            --text-dark: #2D3748;
            --text-light: #718096;
            --accent-green: #00C853;
            --border-color: #E2E8F0;
            --shadow: 0 4px 12px rgba(0, 86, 168, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            background-color: var(--light-bg);
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-orange);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark-bg) 0%, #1a2b3e 100%);
            color: white;
            padding: 1.2rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 1px;
            background: linear-gradient(to right, #00C9FF, var(--primary-blue));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .logo a {
            color: transparent;
        }
        .desktop-nav ul {
            display: flex;
            gap: 2rem;
            list-style: none;
        }
        .desktop-nav a {
            color: white;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary-orange);
            transition: width 0.3s ease;
        }
        .desktop-nav a:hover::after,
        .desktop-nav a.active::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: var(--dark-bg);
            padding: 1.5rem;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .mobile-nav.active {
            display: block;
        }
        .mobile-nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .mobile-nav a {
            color: white;
            font-size: 1.2rem;
            display: block;
            padding: 0.8rem;
            border-radius: 5px;
        }
        .mobile-nav a:hover {
            background: rgba(255, 107, 0, 0.15);
        }
        .breadcrumb {
            background: #E9F2FF;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ul {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: var(--text-light);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 2.5rem;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 1.5rem;
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--dark-bg);
        }
        .meta {
            display: flex;
            gap: 1.5rem;
            color: var(--text-light);
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }
        .meta span {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .article-content {
            font-size: 1.1rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-content h2 {
            font-size: 2rem;
            color: var(--primary-blue);
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed var(--border-color);
        }
        .article-content h3 {
            font-size: 1.6rem;
            color: var(--dark-bg);
            margin: 2.5rem 0 1rem;
        }
        .article-content ul, .article-content ol {
            margin-left: 1.8rem;
            margin-bottom: 1.5rem;
        }
        .article-content li {
            margin-bottom: 0.7rem;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0f9ff 0%, #e1f5fe 100%);
            border-left: 5px solid var(--primary-blue);
            padding: 1.8rem;
            border-radius: 0 8px 8px 0;
            margin: 2.5rem 0;
            box-shadow: 0 3px 8px rgba(0,0,0,0.05);
        }
        .highlight-box h4 {
            color: var(--primary-blue);
            margin-bottom: 0.8rem;
            font-size: 1.3rem;
        }
        .featured-image {
            margin: 2.5rem auto;
            text-align: center;
        }
        .featured-image img {
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            transition: transform 0.5s ease;
        }
        .featured-image img:hover {
            transform: scale(1.01);
        }
        .image-caption {
            font-style: italic;
            color: var(--text-light);
            font-size: 0.95rem;
            margin-top: 0.8rem;
        }
        .key-term {
            font-weight: 800;
            color: var(--secondary-orange);
            background: #FFF5EB;
            padding: 0.1rem 0.4rem;
            border-radius: 3px;
        }
        .internal-link {
            font-weight: 600;
            border-bottom: 1px dotted var(--primary-blue);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: 12px;
            padding: 1.8rem;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            color: var(--dark-bg);
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid var(--border-color);
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid var(--border-color);
            border-right: none;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .search-form input:focus {
            border-color: var(--primary-blue);
        }
        .search-form button {
            background: linear-gradient(to right, var(--primary-blue), #0077CC);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: linear-gradient(to right, #0077CC, var(--secondary-orange));
        }
        .rating-container {
            text-align: center;
        }
        .stars {
            font-size: 2rem;
            color: #FFD700;
            margin-bottom: 1rem;
            cursor: pointer;
        }
        .stars span {
            margin: 0 0.1rem;
            transition: transform 0.2s;
        }
        .stars span:hover {
            transform: scale(1.2);
        }
        .rating-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            margin: 1rem 0;
            font-size: 1rem;
            resize: vertical;
            min-height: 100px;
            outline: none;
            transition: var(--transition);
        }
        .rating-form textarea:focus {
            border-color: var(--primary-blue);
        }
        .rating-form button {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(to right, var(--accent-green), #00B248);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-form button:hover {
            background: linear-gradient(to right, #00B248, #009624);
            transform: translateY(-2px);
        }
        .comment-list {
            max-height: 400px;
            overflow-y: auto;
            padding-right: 0.5rem;
        }
        .comment {
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .comment-author {
            font-weight: 600;
            color: var(--primary-blue);
        }
        .comment-form input,
        .comment-form textarea {
            width: 100%;
            padding: 0.9rem;
            margin-bottom: 1rem;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .comment-form input:focus,
        .comment-form textarea:focus {
            border-color: var(--primary-blue);
        }
        .comment-form button {
            background: linear-gradient(to right, var(--primary-blue), #0077CC);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: linear-gradient(to right, #0077CC, var(--secondary-orange));
        }
        .site-footer {
            background: var(--dark-bg);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h4 {
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            color: #FFD700;
        }
        .friend-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .friend-links a {
            color: #CBD5E0;
            display: flex;
            align-items: center;
            gap: 0.7rem;
            transition: var(--transition);
        }
        .friend-links a:hover {
            color: var(--secondary-orange);
            transform: translateX(5px);
        }
        .friend-links i {
            color: var(--accent-green);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2D3748;
            color: #A0AEC0;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .article {
                padding: 1.8rem;
            }
            .main-content {
                padding: 1.5rem 0;
            }
            .sidebar-widget {
                padding: 1.5rem;
            }
        }