* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease;
        }
        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);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: #fff;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: #ffd700;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .logo span {
            color: #4fc3f7;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffd700;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 10px;
            color: #5c6bc0;
        }
        .breadcrumb a:hover {
            color: #1a237e;
            text-decoration: underline;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: #fff;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }
        .sidebar {
            background: #fff;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            align-self: start;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ffd700;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1.2rem;
            padding-left: 0.75rem;
            border-left: 5px solid #4fc3f7;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            color: #555;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 1rem 1.5rem;
            background-color: #f0f4ff;
            border-left: 4px solid #3949ab;
            border-radius: 0 8px 8px 0;
        }
        .highlight {
            background-color: #fffde7;
            padding: 1.5rem;
            border: 2px dashed #ffb300;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .highlight strong {
            color: #e65100;
        }
        .term {
            font-weight: bold;
            color: #1a237e;
            font-style: italic;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3em;
        }
        ul, ol {
            margin-bottom: 1.5rem;
            padding-left: 2rem;
        }
        li {
            margin-bottom: 0.7rem;
        }
        .table-container {
            overflow-x: auto;
            margin: 2rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }
        th, td {
            padding: 1rem;
            text-align: left;
            border: 1px solid #ddd;
        }
        th {
            background-color: #1a237e;
            color: white;
            font-weight: 600;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        tr:hover {
            background-color: #e8eaf6;
        }
        .featured-image {
            margin: 2.5rem 0;
            text-align: center;
        }
        .featured-image img {
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            max-height: 500px;
            object-fit: cover;
            width: 100%;
        }
        .img-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .module {
            margin: 2.5rem 0;
            padding: 2rem;
            background: linear-gradient(to right, #f3e5f5, #e8eaf6);
            border-radius: 12px;
        }
        .module h3 {
            color: #6a1b9a;
            margin-top: 0;
        }
        .search-box, .comment-form, .rating-form {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .search-box input,
        .comment-form input,
        .comment-form textarea,
        .rating-form select {
            flex: 1 1 300px;
            padding: 0.9rem 1.2rem;
            border: 2px solid #bdbdbd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        .search-box input:focus,
        .comment-form input:focus,
        .comment-form textarea:focus,
        .rating-form select:focus {
            border-color: #3949ab;
            outline: none;
            box-shadow: 0 0 0 3px rgba(57, 73, 171, 0.2);
        }
        .btn {
            padding: 0.9rem 2rem;
            background: linear-gradient(135deg, #3949ab, #1a237e);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        .btn:hover {
            background: linear-gradient(135deg, #1a237e, #3949ab);
            transform: translateY(-3px);
            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: #ffd700;
        }
        .sidebar h3 {
            color: #1a237e;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #ffd700;
        }
        .sidebar ul {
            list-style: none;
            padding-left: 0;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed #e0e0e0;
        }
        .sidebar a:hover {
            color: #3949ab;
            padding-left: 5px;
        }
        .web-links {
            background-color: #1a237e;
            color: #fff;
            padding: 2.5rem 0;
            margin-top: 3rem;
        }
        .web-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 1.2rem;
            border-radius: 8px;
            transition: transform 0.3s, background-color 0.3s;
        }
        .web-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-5px);
        }
        .web-link a {
            color: #ffd700;
            font-weight: 600;
            display: block;
        }
        .web-link a:hover {
            text-decoration: underline;
        }
        .site-footer {
            background-color: #0d153a;
            color: #b0bec5;
            padding: 3rem 0 1.5rem;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }
        .copyright {
            font-size: 0.9rem;
            border-top: 1px solid #37474f;
            padding-top: 1.5rem;
            width: 100%;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: #1a237e;
                padding: 1rem;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            }
            .main-nav.active ul {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .article-content,
            .sidebar {
                padding: 1.5rem;
            }
            .module {
                padding: 1.5rem;
            }
        }