:root {
            --primary: #4a6fa5;
            --secondary: #166088;
            --accent: #8bc34a;
            --dark: #2c3e50;
            --light: #ecf0f1;
            --gray: #95a5a6;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f9f9f9;
            color: #333;
            line-height: 1.8;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark), var(--primary));
            color: white;
            padding: 1.5rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent);
        }
        .my-logo:hover {
            text-decoration: none;
            color: var(--accent);
        }
        .search-box {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            padding: 5px;
            min-width: 300px;
        }
        .search-box input {
            flex-grow: 1;
            border: none;
            padding: 10px 20px;
            outline: none;
        }
        .search-box button {
            background: var(--accent);
            border: none;
            color: white;
            padding: 10px 20px;
            cursor: pointer;
            border-radius: 50px;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--secondary);
        }
        nav {
            margin-top: 1.5rem;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 10px;
        }
        .nav-desktop {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 25px;
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 8px 15px;
            border-radius: 5px;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: var(--dark);
            padding: 15px;
            border-radius: 10px;
            margin-top: 15px;
            gap: 10px;
            animation: fadeIn 0.5s;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .nav-mobile.active {
            display: flex;
        }
        .breadcrumb {
            margin-top: 15px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.8);
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.9);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        main {
            flex: 1;
            padding: 40px 0;
        }
        article {
            background: white;
            border-radius: 15px;
            padding: 40px;
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }
        h1 {
            color: var(--dark);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid var(--accent);
            padding-bottom: 15px;
        }
        h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 2.5rem 0 1.5rem;
            padding-top: 10px;
        }
        h3 {
            color: var(--secondary);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #555;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--light);
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 15px;
        }
        .last-updated {
            color: var(--secondary);
            font-weight: 600;
        }
        .last-updated i {
            margin-right: 8px;
        }
        .content-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 30px auto;
            display: block;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .content-img:hover {
            transform: scale(1.01);
        }
        .highlight-box {
            background: linear-gradient(to right, #e3f2fd, #f3e5f5);
            border-left: 5px solid var(--accent);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .highlight-box p {
            margin-bottom: 0;
            font-style: italic;
            color: var(--dark);
        }
        .tip {
            background-color: #e8f5e9;
            padding: 15px;
            border-radius: 10px;
            margin: 20px 0;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }
        .tip i {
            color: var(--accent);
            font-size: 1.5rem;
            flex-shrink: 0;
            margin-top: 5px;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 25px;
        }
        li {
            margin-bottom: 10px;
        }
        strong {
            color: var(--dark);
        }
        em {
            color: var(--gray);
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 50px 0;
        }
        .comment-form, .rating-form {
            background: var(--light);
            padding: 30px;
            border-radius: 15px;
            box-shadow: var(--shadow);
        }
        .form-title {
            color: var(--primary);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--accent);
            outline: none;
        }
        .btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn:hover {
            background: var(--secondary);
            text-decoration: none;
            transform: translateY(-3px);
            box-shadow: 0 7px 10px rgba(0,0,0,0.1);
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label {
            color: #ffc107;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 25px;
            border-bottom: 2px solid var(--accent);
            padding-bottom: 10px;
        }
        .footer-links {
            list-style: none;
            margin-left: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #ccc;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        friend-link {
            display: inline-flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 20px 0;
        }
        friend-link a {
            background: rgba(255, 255, 255, 0.1);
            color: white;
            padding: 8px 15px;
            border-radius: 5px;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            background: var(--accent);
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .search-box { min-width: 250px; }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 20px;
                text-align: center;
            }
            .search-box {
                width: 100%;
            }
            .hamburger {
                display: block;
                margin: 20px auto 0;
            }
            .nav-desktop {
                display: none;
            }
            .nav-mobile {
                width: 100%;
            }
            article {
                padding: 25px;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .container { padding: 0 15px; }
            article { padding: 20px; }
            .article-meta { flex-direction: column; align-items: flex-start; }
        }