* { 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: #2c3e50;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1.2rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-family: 'Georgia', serif;
            font-size: 2.5rem;
            font-weight: 800;
            color: #ffeb3b;
            text-decoration: none;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
        }
        .logo a:hover {
            color: #fff;
            text-shadow: 0 0 10px #ffeb3b;
        }
        .logo span {
            color: #c5cae9;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e8eaf6;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffeb3b;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
        }
        .hamburger span {
            width: 30px;
            height: 4px;
            background-color: #ffeb3b;
            border-radius: 2px;
            transition: 0.3s;
        }
        .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(8px, 8px); }
        .hamburger.active span:nth-child(2) { opacity: 0; }
        .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(8px, -8px); }
        .breadcrumb {
            background: #edf2f7;
            padding: 1rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.75rem;
            color: #718096;
        }
        .breadcrumb a {
            color: #4a5568;
            text-decoration: none;
        }
        .breadcrumb a:hover { color: #1a237e; text-decoration: underline; }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
        }
        .main-article {
            background: white;
            padding: 2.5rem;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        .article-header {
            margin-bottom: 2.5rem;
            border-bottom: 3px solid #e2e8f0;
            padding-bottom: 1.5rem;
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .meta {
            color: #718096;
            font-size: 0.95rem;
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1rem;
        }
        .meta i { margin-right: 0.5rem; }
        .content-section {
            margin-bottom: 3rem;
        }
        .content-section h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px dashed #c5cae9;
        }
        .content-section h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        .content-section p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background: linear-gradient(120deg, #e3f2fd 0%, #f3e5f5 100%);
            border-left: 5px solid #673ab7;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 12px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            transition: transform 0.5s ease;
        }
        .feature-img:hover { transform: scale(1.01); }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .interactive-module {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #dee2e6;
        }
        .module-title {
            font-size: 1.5rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #495057;
        }
        .form-control {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #3949ab;
            box-shadow: 0 0 0 3px rgba(57, 73, 171, 0.2);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #3949ab, #283593);
            color: white;
            padding: 0.875rem 2rem;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        .btn:hover {
            background: linear-gradient(90deg, #283593, #1a237e);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active { color: #ffc107; }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-card {
            background: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.07);
        }
        .sidebar-card h3 {
            color: #1a237e;
            margin-bottom: 1.2rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #e8eaf6;
        }
        .topics ul {
            list-style: none;
        }
        .topics li { margin-bottom: 0.9rem; }
        .topics a {
            color: #4a5568;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            transition: color 0.3s;
            padding: 0.5rem;
            border-radius: 6px;
        }
        .topics a:hover {
            color: #1a237e;
            background-color: #f1f3ff;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
        }
        .web-link {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }
        .web-link:hover { transform: translateY(-5px); }
        .web-link a {
            color: #3949ab;
            text-decoration: none;
            font-weight: 600;
            display: block;
            text-align: center;
        }
        .main-footer {
            background: linear-gradient(90deg, #1a237e, #283593);
            color: #e8eaf6;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section { flex: 1; min-width: 250px; }
        .footer-section h4 {
            color: #ffeb3b;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.75rem; }
        .footer-links a {
            color: #c5cae9;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover { color: #ffeb3b; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.95rem;
            color: #c5cae9;
        }
        @media (max-width: 768px) {
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #283593;
                padding: 1rem;
                border-top: 1px solid #3949ab;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
            }
            .main-nav.active ul { display: flex; }
            .hamburger { display: flex; }
            .article-header h1 { font-size: 2.2rem; }
            .content-section h2 { font-size: 1.8rem; }
            .content-section h3 { font-size: 1.4rem; }
            .main-article { padding: 1.5rem; }
        }