:root {
            --primary-color: #2a9d8f;
            --secondary-color: #264653;
            --accent-color: #e9c46a;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --border-radius: 8px;
            --container-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--primary-color);
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--secondary-color);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2.2rem;
            color: var(--accent-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--primary-color);
        }
        .my-logo:hover {
            opacity: 0.9;
        }
        .nav-desktop {
            display: flex;
            gap: 30px;
        }
        @media (max-width: 992px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 5px 0;
            border-bottom: 2px solid transparent;
        }
        .nav-desktop a:hover {
            border-bottom-color: var(--accent-color);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 992px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background-color: var(--secondary-color);
            padding: 20px;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            z-index: 999;
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile a {
            display: block;
            color: white;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            background-color: var(--light-color);
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #eee;
        }
        .breadcrumb a {
            color: var(--gray-color);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        .breadcrumb i {
            margin: 0 8px;
            color: #ccc;
        }
        main {
            padding: 40px 0;
            min-height: 80vh;
        }
        article {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        .article-header {
            text-align: center;
            padding: 40px 20px;
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
            color: white;
            margin-bottom: 40px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 0.95rem;
            opacity: 0.9;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-area {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-area {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            font-size: 1.1rem;
        }
        .article-content p {
            margin-bottom: 1.5em;
            text-align: justify;
        }
        .article-content h2 {
            font-size: 2rem;
            color: var(--secondary-color);
            margin: 2.5em 0 1em;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
        }
        .article-content h3 {
            font-size: 1.6rem;
            color: var(--primary-color);
            margin: 2em 0 1em;
        }
        .article-content h4 {
            font-size: 1.3rem;
            color: var(--gray-color);
            margin: 1.8em 0 0.8em;
        }
        .article-content ul, .article-content ol {
            margin-left: 2em;
            margin-bottom: 1.5em;
        }
        .article-content li {
            margin-bottom: 0.5em;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 25px;
            border-left: 5px solid var(--accent-color);
            margin: 2em 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .highlight strong {
            color: var(--secondary-color);
        }
        .feature-img {
            width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2em 0;
            box-shadow: var(--shadow);
        }
        .interactive-section {
            background-color: var(--light-color);
            padding: 30px;
            border-radius: var(--border-radius);
            margin: 3em 0;
        }
        .interactive-section h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .btn-block {
            display: block;
            width: 100%;
        }
        .rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffc107;
        }
        .rating input:checked ~ label {
            color: #ffc107;
        }
        .sidebar {
            background-color: var(--light-color);
            padding: 25px;
            border-radius: var(--border-radius);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            color: var(--secondary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #ddd;
        }
        .toc {
            list-style: none;
        }
        .toc li {
            margin-bottom: 10px;
        }
        .toc a {
            display: block;
            padding: 8px 12px;
            background-color: white;
            border-radius: 4px;
            border-left: 3px solid transparent;
        }
        .toc a:hover {
            border-left-color: var(--primary-color);
            background-color: #f0f9f8;
        }
        .related-links {
            margin-top: 30px;
        }
        .related-links a {
            display: block;
            padding: 10px 0;
            border-bottom: 1px dashed #ddd;
        }
        .related-links a:last-child {
            border-bottom: none;
        }
        .site-footer {
            background-color: var(--secondary-color);
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
        @media (max-width: 768px) {
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }
        }
        @media (max-width: 480px) {
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        .footer-col h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: var(--accent-color);
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 12px;
        }
        .footer-col a {
            color: #ccc;
        }
        .footer-col a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        friend-link h4 {
            color: var(--accent-color);
            margin-bottom: 15px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 0.5em; }
        .mb-2 { margin-bottom: 1em; }
        .mb-3 { margin-bottom: 1.5em; }
        .mb-4 { margin-bottom: 2em; }
        .mt-1 { margin-top: 0.5em; }
        .mt-2 { margin-top: 1em; }
        .mt-3 { margin-top: 1.5em; }
        .mt-4 { margin-top: 2em; }
        .emoji { font-size: 1.2em; }
        .keyword { color: var(--primary-color); font-weight: bold; }