* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f9f9f9;
            padding: 0;
            margin: 0;
        }
        a {
            color: #1a73e8;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #0d47a1;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #2c3e50, #1a1a2e);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: #4fc3f7;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a:hover {
            color: #29b6f6;
        }
        .logo i {
            font-size: 2.5rem;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            color: #e0e0e0;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: background 0.3s;
        }
        nav a:hover {
            background: rgba(255,255,255,0.1);
            color: #ffffff;
        }
        .breadcrumb {
            padding: 1rem 20px;
            background: #f1f8ff;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb a {
            color: #5a5a5a;
        }
        .breadcrumb a:hover {
            color: #1a73e8;
        }
        main {
            padding: 2rem 0;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 2rem auto;
            max-width: 1100px;
        }
        .article-header {
            text-align: center;
            padding: 2rem;
            border-bottom: 3px solid #4fc3f7;
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 3rem;
            color: #1a237e;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            color: #666;
            font-size: 0.95rem;
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .content {
            padding: 0 2rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #0d47a1;
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #bbdefb;
        }
        h3 {
            font-size: 1.8rem;
            color: #1565c0;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #1976d2;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
            line-height: 1.9;
        }
        .highlight {
            background: #e3f2fd;
            padding: 1.5rem;
            border-left: 5px solid #1a73e8;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .featured-image {
            text-align: center;
            margin: 2.5rem 0;
        }
        .featured-image img {
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            transition: transform 0.5s ease;
        }
        .featured-image img:hover {
            transform: scale(1.02);
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .user-interaction {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
            padding: 2rem;
            background: #f8fdff;
            border-radius: 10px;
            border: 1px solid #bbdefb;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #333;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #1a73e8;
            outline: none;
            box-shadow: 0 0 0 3px rgba(26,115,232,0.2);
        }
        button {
            background: linear-gradient(to right, #1a73e8, #0d47a1);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            font-size: 1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            font-weight: 600;
        }
        button:hover {
            background: linear-gradient(to right, #0d47a1, #1a73e8);
            transform: translateY(-2px);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            align-items: center;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffc107;
        }
        footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            padding: 0 20px;
        }
        .footer-section h3 {
            color: #4fc3f7;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .friend-links {
            list-style: none;
        }
        .friend-links li {
            margin-bottom: 0.8rem;
        }
        .friend-links a {
            color: #bbdefb;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .friend-links a:hover {
            color: #ffffff;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #4a6572;
            font-size: 0.9rem;
            color: #b0bec5;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                align-items: flex-start;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            nav ul {
                flex-direction: column;
                gap: 0;
                display: none;
                width: 100%;
                background: #1a1a2e;
                padding: 1rem 0;
                border-radius: 0 0 10px 10px;
            }
            nav ul.active {
                display: flex;
            }
            nav li {
                width: 100%;
                text-align: center;
            }
            nav a {
                display: block;
                padding: 1rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .content {
                padding: 0 1rem;
            }
            .user-interaction {
                grid-template-columns: 1fr;
                padding: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 3rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .bold {
            font-weight: 800;
            color: #1a237e;
        }
        .italic {
            font-style: italic;
        }