* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #1a252f;
            --text: #333333;
            --text-light: #7f8c8d;
            --border: #bdc3c7;
            --success: #27ae60;
            --warning: #f39c12;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
            --radius: 8px;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--primary);
        }
        h1 {
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-align: center;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--accent);
        }
        h2 {
            font-size: 2.2rem;
            margin-top: 3rem;
            padding-left: 1rem;
            border-left: 5px solid var(--secondary);
        }
        h3 {
            font-size: 1.8rem;
            margin-top: 2.5rem;
            color: var(--dark);
        }
        h4 {
            font-size: 1.4rem;
            margin-top: 2rem;
            color: var(--accent);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 1rem 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--secondary);
            font-size: 2rem;
        }
        .logo:hover {
            color: var(--accent);
            transform: scale(1.05);
            transition: var(--transition);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            text-decoration: none;
            color: var(--primary);
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        nav a:hover {
            background-color: var(--accent);
            color: white;
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 1rem 0;
            margin-bottom: 2rem;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .search-container {
            background: linear-gradient(135deg, var(--primary), var(--dark));
            padding: 3rem 0;
            text-align: center;
            color: white;
            margin-bottom: 3rem;
            border-radius: var(--radius);
        }
        .search-form {
            max-width: 600px;
            margin: 2rem auto 0;
            display: flex;
            gap: 0;
        }
        .search-input {
            flex: 1;
            padding: 1rem 1.5rem;
            border: none;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1.1rem;
            outline: none;
        }
        .search-button {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-button:hover {
            background-color: #c0392b;
            transform: scale(1.05);
        }
        main {
            padding: 2rem 0;
            background-color: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
            position: relative;
        }
        .content-wrapper {
            padding: 0 2rem;
        }
        .article-section {
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid var(--border);
        }
        .highlight-box {
            background: linear-gradient(to right, var(--light), #f8f9fa);
            border-left: 4px solid var(--accent);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .expert-tip {
            background-color: #fff8e1;
            border: 2px solid var(--warning);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .expert-tip::before {
            content: "💡 Expert Tip: ";
            font-weight: bold;
            color: var(--warning);
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            margin: 2rem auto;
            display: block;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 24px rgba(0,0,0,0.15);
        }
        .content-link {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            transition: var(--transition);
        }
        .content-link:hover {
            background-color: rgba(52, 152, 219, 0.1);
            text-decoration: underline;
        }
        ul, ol {
            margin: 1.5rem 0;
            padding-left: 2rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        .ratings-section {
            background-color: var(--light);
            padding: 2rem;
            border-radius: var(--radius);
            margin: 3rem 0;
        }
        .rating-form, .comment-form {
            display: grid;
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 2rem;
            color: var(--warning);
            cursor: pointer;
        }
        .star-rating i {
            transition: var(--transition);
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        input, textarea, select {
            padding: 1rem;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 1rem;
            font-family: inherit;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .submit-button {
            background-color: var(--success);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            align-self: flex-start;
        }
        .submit-button:hover {
            background-color: #219653;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(33, 150, 83, 0.3);
        }
        footer {
            background-color: var(--dark);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: var(--radius);
            margin: 0.5rem 0;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.2);
            transform: translateX(5px);
        }
        friend-link a {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .last-updated {
            background-color: var(--light);
            padding: 1rem;
            border-radius: var(--radius);
            margin: 2rem 0;
            text-align: center;
            font-style: italic;
            color: var(--text-light);
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.6rem; }
            .container { padding: 0 1rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            nav { display: none; width: 100%; margin-top: 1rem; }
            nav.active { display: block; }
            nav ul { flex-direction: column; gap: 0.5rem; }
            nav a { display: block; text-align: center; }
            .header-container { flex-direction: column; align-items: flex-start; }
            .content-wrapper { padding: 0 1rem; }
            .search-form { flex-direction: column; }
            .search-input, .search-button { border-radius: var(--radius); width: 100%; }
            .footer-container { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.4rem; }
            html { font-size: 14px; }
            .logo { font-size: 2rem; }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        @media print {
            nav, .search-container, .ratings-section, footer { display: none; }
            body { background: white; }
            .container { max-width: 100%; }
            main { box-shadow: none; }
        }