* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        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;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: #2c5aa0; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e63946; }
        ul, ol { padding-left: 2rem; margin: 1rem 0; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(to right, #1a2980, #26d0ce);
            color: white;
            padding: 1.5rem 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;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2rem;
            font-weight: 900;
            background: linear-gradient(to right, #ffd89b, #19547b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo a { background: none; -webkit-text-fill-color: inherit; }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #ffd89b;
            transition: width 0.3s;
        }
        .desktop-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: #1a2980;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav ul { list-style: none; }
        .mobile-nav li { margin: 0.8rem 0; }
        .mobile-nav a { color: white; font-weight: 600; display: block; padding: 0.5rem; }
        .breadcrumb {
            padding: 1rem 0;
            background: #f8f9fa;
            border-bottom: 1px solid #dee2e6;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #6c757d; }
        .breadcrumb a:hover { color: #1a2980; }
        .breadcrumb span { color: #495057; }
        main { padding: 2rem 0; background: white; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); margin: 2rem auto; }
        .article-header { text-align: center; padding-bottom: 2rem; border-bottom: 2px dashed #26d0ce; margin-bottom: 2rem; }
        h1 { color: #1a2980; font-size: 2.8rem; margin-bottom: 1rem; }
        .meta { color: #6c757d; font-style: italic; margin-bottom: 1rem; }
        .intro { font-size: 1.2rem; color: #555; max-width: 900px; margin: 0 auto 2rem; }
        section { margin-bottom: 3rem; padding: 0 2rem; }
        h2 { color: #26d0ce; border-left: 5px solid #e63946; padding-left: 1rem; margin: 2rem 0 1.5rem; font-size: 2rem; }
        h3 { color: #1a2980; margin: 1.8rem 0 1rem; font-size: 1.6rem; }
        h4 { color: #2c5aa0; margin: 1.5rem 0 0.8rem; font-size: 1.3rem; }
        p { margin-bottom: 1.2rem; text-align: justify; }
        .highlight { background: #fffacd; padding: 1.5rem; border-radius: 8px; border-left: 4px solid #ffd700; margin: 1.5rem 0; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .bold { font-weight: 800; color: #1a2980; }
        .img-container {
            text-align: center;
            margin: 2rem 0;
            padding: 1rem;
            background: #f8f9fa;
            border-radius: 10px;
        }
        .img-container img { border-radius: 8px; box-shadow: 0 5px 15px rgba(0,0,0,0.1); margin: 0 auto; }
        .caption { font-style: italic; color: #666; margin-top: 0.5rem; }
        .user-interaction {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 2rem;
            border-top: 3px solid #26d0ce;
        }
        .form-group { margin-bottom: 1.5rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #495057; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ced4da;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
        }
        button {
            background: linear-gradient(to right, #1a2980, #26d0ce);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        button:hover { transform: translateY(-2px); box-shadow: 0 5px 10px rgba(0,0,0,0.2); }
        footer {
            background: #1a2980;
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 { color: #ffd89b; border: none; padding: 0; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #c0c0c0; }
        .footer-links a:hover { color: #ffd89b; }
        friend-link {
            display: block;
            padding: 1rem;
            background: rgba(255,255,255,0.1);
            border-radius: 5px;
            margin: 0.5rem 0;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #c0c0c0;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.4rem; }
            section { padding: 0 1rem; }
            .user-interaction { margin: 2rem 1rem; }
        }