* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.7;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: #4361ee;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #3a56d4;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a:hover {
            color: #b3e5fc;
            text-decoration: none;
        }
        .logo i {
            color: #4fc3f7;
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .desktop-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        .desktop-nav a:hover,
        .desktop-nav a.active {
            color: #4fc3f7;
            border-bottom-color: #4fc3f7;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            background-color: #283593;
            padding: 20px;
            flex-direction: column;
            gap: 15px;
            border-top: 1px solid #3949ab;
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: #e3f2fd;
            padding: 12px;
            border-radius: 6px;
            background-color: rgba(255, 255, 255, 0.05);
        }
        .mobile-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }
        .breadcrumb a {
            color: #5c6bc0;
        }
        .breadcrumb i {
            margin: 0 5px;
            color: #7986cb;
        }
        main {
            flex: 1;
            padding: 40px 0;
        }
        article {
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            padding: 40px;
            margin-bottom: 40px;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 35px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e8eaf6;
        }
        h3 {
            font-size: 1.5rem;
            color: #3949ab;
            margin: 25px 0 12px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: #555;
            font-weight: 500;
            margin-bottom: 30px;
        }
        .highlight {
            background-color: #f3e5f5;
            border-left: 5px solid #8e24aa;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .term {
            font-weight: bold;
            color: #1a237e;
        }
        ul, ol {
            margin-bottom: 20px;
            padding-left: 25px;
        }
        li {
            margin-bottom: 10px;
        }
        .article-img {
            margin: 30px auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            max-width: 800px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .search-box {
            background: #f1f8ff;
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
            text-align: center;
        }
        .search-box h3 {
            margin-top: 0;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 20px auto 0;
        }
        .search-input {
            flex: 1;
            padding: 15px;
            border: 2px solid #4361ee;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-btn {
            background: #4361ee;
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-btn:hover {
            background: #3a56d4;
        }
        .user-feedback {
            margin-top: 50px;
            border-top: 1px solid #eee;
            padding-top: 40px;
        }
        .feedback-form {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 30px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group.full-width {
            grid-column: 1 / -1;
        }
        label {
            margin-bottom: 8px;
            font-weight: 600;
            color: #444;
        }
        input, textarea, select {
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .submit-btn {
            background: linear-gradient(to right, #4361ee, #3a56d4);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            justify-self: start;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }
        .footer-links {
            background-color: #e8eaf6;
            padding: 40px 0;
        }
        .footer-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 25px;
        }
        .web-link {
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .web-link a {
            color: #3949ab;
            font-weight: 500;
        }
        .web-link:hover {
            transform: translateY(-5px);
            transition: transform 0.3s ease;
        }
        footer {
            background-color: #1a237e;
            color: #e8eaf6;
            padding: 30px 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .copyright {
            font-size: 0.95rem;
            opacity: 0.9;
        }
        .footer-nav a {
            color: #c5cae9;
            margin: 0 15px;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 30px; }
        }
        @media (max-width: 768px) {
            .header-top { padding: 12px 0; }
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            .feedback-form {
                grid-template-columns: 1fr;
            }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            article { padding: 25px 20px; }
            .search-form {
                flex-direction: column;
            }
            .search-input {
                border-radius: 8px;
                margin-bottom: 10px;
            }
            .search-btn {
                border-radius: 8px;
                padding: 15px;
            }
        }
        @media (max-width: 480px) {
            .breadcrumb .container { font-size: 0.85rem; }
            .footer-links .container {
                grid-template-columns: 1fr;
            }
            .footer-nav a {
                display: block;
                margin: 10px 0;
            }
        }