* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #1a237e;
            --secondary: #ff9800;
            --accent: #4caf50;
            --light: #f5f7fa;
            --dark: #222;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            background-color: #fff;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--primary);
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary), #283593);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
        }
        .logo a {
            color: white;
        }
        .logo span {
            color: var(--secondary);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .nav-desktop a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: var(--primary);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 0.8rem 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            background: var(--light);
            padding: 1rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        main {
            padding: 2rem 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .content-area {
            background: white;
            border-radius: 8px;
            overflow: hidden;
        }
        .sidebar {
            background: var(--light);
            padding: 1.5rem;
            border-radius: 8px;
            height: fit-content;
        }
        .sidebar-widget {
            margin-bottom: 2rem;
        }
        .sidebar-widget h3 {
            color: var(--primary);
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        .article-header {
            margin-bottom: 2rem;
            text-align: center;
            padding-bottom: 1.5rem;
            border-bottom: 2px dashed var(--accent);
        }
        .article-header h1 {
            color: var(--primary);
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        .article-meta {
            color: var(--gray);
            font-size: 0.95rem;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .article-content {
            font-size: 1.1rem;
        }
        .article-content section {
            margin-bottom: 3rem;
        }
        .article-content h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #eee;
        }
        .article-content h3 {
            color: #444;
            font-size: 1.5rem;
            margin: 1.5rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .highlight-box {
            background: #e8f4fd;
            border-left: 5px solid var(--primary);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .pdf-download {
            text-align: center;
            background: linear-gradient(to right, #1a237e, #3949ab);
            color: white;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .pdf-download .btn {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 1rem 2rem;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.2rem;
            margin-top: 1rem;
            transition: var(--transition);
        }
        .pdf-download .btn:hover {
            background: #ffb74d;
            transform: translateY(-3px);
        }
        .feature-image {
            margin: 2rem 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .feature-image figcaption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 0.5rem;
            background: #f9f9f9;
        }
        .interactive-section {
            background: var(--light);
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
        }
        .interactive-section h2 {
            color: var(--primary);
            text-align: center;
            margin-bottom: 1.5rem;
        }
        .search-box, .comment-form, .rating-form {
            margin-bottom: 2rem;
        }
        .search-box form, .comment-form form, .rating-form form {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .search-box input, .comment-form input, .comment-form textarea, .rating-form select {
            flex: 1;
            min-width: 200px;
            padding: 0.8rem 1rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
        }
        .comment-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .btn-submit {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: var(--transition);
        }
        .btn-submit:hover {
            background: #388e3c;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 1rem 0;
            justify-content: center;
        }
        .web-links {
            background: #f1f3f9;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: white;
            padding: 0.8rem 1.2rem;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        .web-link a {
            color: var(--dark);
            display: flex;
            align-items: center;
        }
        .web-link a:before {
            content: "🔗";
            margin-right: 8px;
        }
        .web-link a:hover {
            color: var(--secondary);
        }
        .site-footer {
            background: var(--dark);
            color: #ccc;
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-widget h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-widget ul {
            list-style: none;
        }
        .footer-widget li {
            margin-bottom: 0.8rem;
        }
        .footer-widget a {
            color: #aaa;
        }
        .footer-widget a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 2px 5px; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        @media (max-width: 768px) {
            .container { padding: 0 15px; }
            .article-meta { flex-direction: column; gap: 0.5rem; align-items: center; }
            .search-box form, .comment-form form, .rating-form form { flex-direction: column; }
        }