* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            min-height: 100vh;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            color: #ffd700;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            font-size: 2.2rem;
        }
        .desktop-nav {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
        }
        .desktop-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .desktop-nav a:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: #283593;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            padding: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 12px 16px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 12px 0;
            margin-bottom: 2rem;
            border-radius: 0 0 8px 8px;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: #5c6bc0;
        }
        .breadcrumb a {
            color: #3949ab;
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        h1 {
            color: #1a237e;
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ffd700;
            padding-bottom: 15px;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
        }
        h2 {
            color: #283593;
            font-size: 1.8rem;
            margin: 2.5rem 0 1.2rem;
            padding-left: 10px;
            border-left: 5px solid #3949ab;
        }
        h3 {
            color: #3949ab;
            font-size: 1.4rem;
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background: linear-gradient(90deg, #e8eaf6, #c5cae9);
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid #3949ab;
            margin: 2rem 0;
        }
        .highlight strong {
            color: #1a237e;
            font-size: 1.2rem;
        }
        .feature-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .feature-item {
            background: #f5f5f5;
            padding: 1.5rem;
            border-radius: 8px;
            text-align: center;
            transition: transform 0.3s ease;
        }
        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .feature-item i {
            font-size: 2.5rem;
            color: #3949ab;
            margin-bottom: 1rem;
        }
        .article-image {
            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;
        }
        .article-image:hover {
            transform: scale(1.02);
        }
        .search-box {
            background: #e3f2fd;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex: 1;
            padding: 12px 16px;
            border: 2px solid #2196f3;
            border-radius: 6px;
            font-size: 1rem;
        }
        .search-btn {
            background: #2196f3;
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s ease;
        }
        .search-btn:hover {
            background: #1976d2;
        }
        .user-interaction {
            background: #f9f9f9;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
            border-top: 4px solid #3949ab;
        }
        .rating-section {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .stars {
            color: #ffc107;
            font-size: 1.5rem;
        }
        .rating-form {
            display: flex;
            gap: 10px;
            align-items: center;
        }
        .rating-form select {
            padding: 8px 12px;
            border-radius: 4px;
            border: 1px solid #ccc;
        }
        .submit-btn {
            background: #4caf50;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
        }
        .comment-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .comment-input {
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-family: inherit;
            min-height: 120px;
            resize: vertical;
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar-section {
            margin-bottom: 2rem;
        }
        .sidebar-section h3 {
            color: #1a237e;
            border-bottom: 2px solid #ffd700;
            padding-bottom: 8px;
            margin-bottom: 1rem;
        }
        .quick-links {
            list-style: none;
        }
        .quick-links li {
            margin-bottom: 12px;
        }
        .quick-links a {
            color: #3949ab;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px;
            border-radius: 4px;
            transition: background 0.3s ease;
        }
        .quick-links a:hover {
            background: #f0f2ff;
        }
        .long-tail-links {
            background: #1a237e;
            padding: 2.5rem 0;
            margin-top: 3rem;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: rgba(255,255,255,0.1);
            padding: 12px 16px;
            border-radius: 6px;
            text-align: center;
        }
        .web-link a {
            color: #bbdefb;
            text-decoration: none;
            font-weight: 500;
        }
        .web-link a:hover {
            color: #ffd700;
            text-decoration: underline;
        }
        footer {
            background: #0d1440;
            color: white;
            padding: 2rem 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        @media (max-width: 768px) {
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }
        .copyright {
            font-size: 0.9rem;
            color: #bbdefb;
        }
        .social-links {
            display: flex;
            gap: 1rem;
        }
        .social-links a {
            color: white;
            font-size: 1.2rem;
            transition: color 0.3s ease;
        }
        .social-links a:hover {
            color: #ffd700;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 2px;
        }
        .bold {
            font-weight: 800;
            color: #1a237e;
        }
        .note {
            background: #fffde7;
            border-left: 4px solid #ffd600;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .warning {
            background: #ffebee;
            border-left: 4px solid #f44336;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }