* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #e74c3c;
            --accent-color: #3498db;
            --text-color: #333;
            --light-bg: #f8f9fa;
            --dark-bg: #2c3e50;
            --border-color: #ddd;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-bg);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--dark-bg);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
        }
        .logo span {
            color: var(--secondary-color);
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-form input {
            padding: 8px 12px;
            border: none;
            border-radius: 4px;
            width: 250px;
        }
        .search-form button {
            background: var(--secondary-color);
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 4px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #c0392b;
        }
        nav {
            background: var(--primary-color);
            margin-top: 1rem;
        }
        .nav-desktop {
            display: flex;
            list-style: none;
        }
        .nav-desktop li {
            position: relative;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            padding: 15px 20px;
            display: block;
            transition: background 0.3s;
        }
        .nav-desktop a:hover {
            background: var(--secondary-color);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            background: var(--primary-color);
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            z-index: 1000;
        }
        .mobile-nav.active {
            display: block;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 15px 20px;
            display: block;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .breadcrumb {
            background: #ecf0f1;
            padding: 10px 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .breadcrumb span {
            margin: 0 5px;
            color: #7f8c8d;
        }
        main {
            padding: 2rem 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 2rem;
            padding: 2rem;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .article-header h1 {
            color: var(--primary-color);
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        .article-meta {
            color: #7f8c8d;
            font-size: 0.9rem;
        }
        .content-section {
            background: white;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .content-section h2 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }
        .content-section h3 {
            color: var(--secondary-color);
            margin: 1.5rem 0 1rem 0;
        }
        .problem-solution {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2rem 0;
        }
        .problem-box, .solution-box {
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid;
        }
        .problem-box {
            background: #ffeaa7;
            border-left-color: #fdcb6e;
        }
        .solution-box {
            background: #d1ecf1;
            border-left-color: var(--accent-color);
        }
        .featured-image {
            text-align: center;
            margin: 2rem 0;
        }
        .featured-image img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .image-caption {
            margin-top: 10px;
            font-style: italic;
            color: #7f8c8d;
        }
        .accordion {
            margin: 2rem 0;
        }
        .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: 4px;
            margin-bottom: 10px;
            overflow: hidden;
        }
        .accordion-header {
            background: var(--light-bg);
            padding: 15px 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.3s;
        }
        .accordion-header:hover {
            background: #e9ecef;
        }
        .accordion-content {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
        }
        .accordion-item.active .accordion-content {
            padding: 20px;
            max-height: 1000px;
        }
        .rating-system {
            background: var(--light-bg);
            padding: 2rem;
            border-radius: 8px;
            text-align: center;
            margin: 2rem 0;
        }
        .stars {
            font-size: 2rem;
            color: #ddd;
            margin: 1rem 0;
            cursor: pointer;
        }
        .stars .star {
            transition: color 0.2s;
        }
        .stars .star:hover,
        .stars .star.active {
            color: #f39c12;
        }
        .comment-system {
            margin: 3rem 0;
        }
        .comment-form {
            background: var(--light-bg);
            padding: 2rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-family: inherit;
        }
        .submit-btn {
            background: var(--accent-color);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s;
        }
        .submit-btn:hover {
            background: #2980b9;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
            margin: 2rem 0;
        }
        .web-link {
            background: var(--light-bg);
            padding: 15px;
            border-radius: 4px;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .web-link:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 500;
        }
        footer {
            background: var(--dark-bg);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .footer-section h3 {
            margin-bottom: 1rem;
            color: var(--secondary-color);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 1rem;
            }
            .search-form input {
                width: 200px;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .problem-solution {
                grid-template-columns: 1fr;
            }
            .web-links {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
            .article-header h1 {
                font-size: 2rem;
            }
        }
        @media (max-width: 480px) {
            .search-form {
                flex-direction: column;
                width: 100%;
            }
            .search-form input {
                width: 100%;
            }
            .content-section {
                padding: 1rem;
            }
        }