* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 0;
            margin: 0;
        }
        a {
            color: #4a6fa5;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #ff6b6b;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(90deg, #2c3e50, #4a6fa5);
            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 a {
            font-size: 2rem;
            font-weight: bold;
            color: #ffd166;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo {
            font-style: italic;
            letter-spacing: 1px;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: background 0.3s ease;
        }
        .nav-desktop a:hover {
            background: rgba(255,255,255,0.2);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2c3e50;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 0.8rem;
            border-bottom: 1px solid #4a6fa5;
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            padding: 1rem 0;
            background: #e9ecef;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #4a6fa5;
        }
        .breadcrumb a::after {
            content: ' › ';
            margin: 0 5px;
        }
        .breadcrumb span:last-child::after {
            content: '';
        }
        main {
            padding: 2rem 0;
            background: white;
            border-radius: 10px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.05);
            margin: 2rem auto;
        }
        .article-header {
            text-align: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid #ffd166;
        }
        h1 {
            font-size: 3rem;
            color: #2c3e50;
            margin-bottom: 1rem;
        }
        .meta {
            color: #666;
            font-size: 0.95rem;
        }
        .meta span {
            margin-right: 1rem;
        }
        .content {
            padding: 0 2rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #4a6fa5;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #c3cfe2;
        }
        h3 {
            font-size: 1.8rem;
            color: #2c3e50;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
            margin-top: 1.2rem;
            margin-bottom: 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            line-height: 1.8;
        }
        .highlight {
            background: #fffacd;
            padding: 1rem;
            border-left: 4px solid #ffd166;
            margin: 1.5rem 0;
            border-radius: 0 5px 5px 0;
        }
        .image-container {
            text-align: center;
            margin: 2rem 0;
        }
        .image-container img {
            border-radius: 10px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-width: 800px;
            margin: 0 auto;
        }
        .caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
            padding: 2rem;
            background: #f8f9fa;
            border-radius: 10px;
            border: 1px solid #dee2e6;
        }
        .feature {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .feature h3 {
            color: #4a6fa5;
            margin-top: 0;
        }
        .feature form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .feature input, .feature textarea, .feature select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
            width: 100%;
        }
        .feature button {
            background: linear-gradient(90deg, #4a6fa5, #2c3e50);
            color: white;
            border: none;
            padding: 0.8rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s ease;
        }
        .feature button:hover {
            background: linear-gradient(90deg, #ff6b6b, #ff8e53);
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.5rem;
            color: #ffd166;
            cursor: pointer;
        }
        .stars span:hover {
            color: #ffb347;
        }
        footer {
            background: #2c3e50;
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: #ffd166;
            margin-bottom: 1rem;
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
            color: #c3cfe2;
            transition: color 0.3s ease;
        }
        friend-link:hover {
            color: #ffd166;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #4a6fa5;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .content {
                padding: 0 1rem;
            }
            .interactive-section {
                grid-template-columns: 1fr;
                padding: 1rem;
            }
        }