* {
            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-color: #f9f9f9;
            max-width: 1920px;
            margin: 0 auto;
            overflow-x: hidden;
        }
        a {
            color: #1a73e8;
            text-decoration: none;
            transition: color 0.3s ease, background-color 0.3s ease;
        }
        a:hover {
            color: #d35400;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            padding: 0 20px;
            margin: 0 auto;
        }
        @media (min-width: 768px) {
            .container {
                padding: 0 40px;
            }
        }
        @media (min-width: 1200px) {
            .container {
                max-width: 1140px;
                padding: 0 15px;
            }
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mb-3 { margin-bottom: 3rem; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .mt-3 { margin-top: 3rem; }
        .py-1 { padding-top: 1rem; padding-bottom: 1rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .py-3 { padding-top: 3rem; padding-bottom: 3rem; }
        .highlight {
            background-color: #fffacd;
            padding: 0.2em 0.4em;
            border-radius: 3px;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background: linear-gradient(135deg, #4CAF50, #2E7D32);
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            text-align: center;
        }
        .btn:hover {
            background: linear-gradient(135deg, #388E3C, #1B5E20);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .site-header {
            background-color: #2c3e50;
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #4CAF50;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: #FF9800;
        }
        .my-logo:hover {
            color: #81C784;
        }
        .nav-desktop {
            display: none;
        }
        @media (min-width: 992px) {
            .nav-desktop {
                display: flex;
                gap: 30px;
            }
        }
        .nav-desktop a {
            color: #ecf0f1;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }
        .nav-desktop a:hover {
            color: #4CAF50;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #4CAF50;
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: block;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (min-width: 992px) {
            .hamburger {
                display: none;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background-color: #34495e;
            padding: 20px;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
            z-index: 999;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile a {
            display: block;
            color: #ecf0f1;
            padding: 15px 0;
            border-bottom: 1px solid #4a6278;
            font-weight: 500;
        }
        .nav-mobile a:hover {
            color: #4CAF50;
            padding-left: 10px;
        }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 12px 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: #7f8c8d;
        }
        .breadcrumb a:hover {
            color: #2c3e50;
        }
        .breadcrumb span {
            color: #2c3e50;
            font-weight: 600;
        }
        main {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
            overflow: hidden;
            margin-bottom: 3rem;
        }
        .article-header {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.9)), url('https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 4rem 2rem;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.95rem;
            opacity: 0.9;
        }
        .article-meta i {
            margin-right: 6px;
        }
        .article-content {
            padding: 3rem 2rem;
        }
        @media (min-width: 768px) {
            .article-content {
                padding: 3rem 4rem;
            }
        }
        .article-content h2 {
            font-size: 2.2rem;
            color: #2c3e50;
            border-bottom: 3px solid #4CAF50;
            padding-bottom: 10px;
            margin: 3rem 0 1.5rem 0;
        }
        .article-content h3 {
            font-size: 1.8rem;
            color: #34495e;
            margin: 2.5rem 0 1rem 0;
        }
        .article-content h4 {
            font-size: 1.4rem;
            color: #4a6278;
            margin: 2rem 0 1rem 0;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-content ul, .article-content ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        .article-content li {
            margin-bottom: 0.8rem;
        }
        .article-content blockquote {
            border-left: 5px solid #4CAF50;
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: #555;
            background-color: #f9f9f9;
            padding-top: 1rem;
            padding-bottom: 1rem;
        }
        .img-container {
            margin: 2.5rem auto;
            text-align: center;
        }
        .img-container img {
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 5px solid #ecf0f1;
        }
        .img-caption {
            font-size: 0.95rem;
            color: #7f8c8d;
            margin-top: 10px;
            font-style: italic;
        }
        .feature-box {
            background-color: #f1f8e9;
            border-left: 6px solid #8BC34A;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-box.warning {
            background-color: #fff3e0;
            border-left-color: #FF9800;
        }
        .feature-box.info {
            background-color: #e3f2fd;
            border-left-color: #2196F3;
        }
        .interaction-module {
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
        }
        .module-title {
            font-size: 1.5rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .module-title i {
            color: #4CAF50;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #555;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #4CAF50;
            outline: none;
            box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #FFD700;
            margin-bottom: 1rem;
        }
        .star-rating i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .site-footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
        }
        @media (min-width: 768px) {
            .footer-container {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            color: #81C784;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section ul li {
            margin-bottom: 0.8rem;
        }
        .footer-section a {
            color: #bdc3c7;
        }
        .footer-section a:hover {
            color: #4CAF50;
        }
        friend-link {
            display: block;
            background-color: #34495e;
            padding: 15px;
            border-radius: 6px;
            margin-top: 1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #4a6278;
            font-size: 0.9rem;
            color: #95a5a6;
        }