:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --text-color: #333;
            --light-bg: #f8f9fa;
            --border-color: #ddd;
            --shadow: 0 2px 10px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: #fff;
        }
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent-color);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-links a:hover,
        .nav-links a:focus {
            background-color: rgba(255,255,255,0.1);
            color: var(--secondary-color);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .search-container {
            margin-left: 1rem;
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            padding: 0.5rem;
            border: none;
            border-radius: 4px 0 0 4px;
            min-width: 200px;
        }
        .search-form button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: #2980b9;
        }
        main {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 1rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        article {
            background-color: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        aside {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        h1, h2, h3, h4 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 0.5rem;
            margin-bottom: 2rem;
        }
        h2 {
            font-size: 1.8rem;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid var(--border-color);
        }
        h3 {
            font-size: 1.4rem;
            margin-top: 1.5rem;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1rem;
        }
        p {
            margin-bottom: 1rem;
        }
        strong {
            color: var(--primary-color);
            font-weight: 600;
        }
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        th, td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        th {
            background-color: var(--light-bg);
            font-weight: 600;
        }
        tr:hover {
            background-color: rgba(52, 152, 219, 0.05);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 1.5rem auto;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: -1rem;
            margin-bottom: 1.5rem;
        }
        .card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--secondary-color);
        }
        .card h3 {
            margin-top: 0;
            color: var(--secondary-color);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background-color: var(--secondary-color);
            color: white;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            text-decoration: none;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            min-height: 44px;
            min-width: 44px;
        }
        .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
        }
        .btn-danger {
            background-color: var(--accent-color);
        }
        .btn-danger:hover {
            background-color: #c0392b;
        }
        form {
            margin: 1.5rem 0;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating-container {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating-stars {
            display: flex;
            gap: 0.25rem;
        }
        .rating-stars i {
            color: #ffc107;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .social-share {
            display: flex;
            gap: 0.75rem;
            margin: 1.5rem 0;
        }
        .social-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: var(--light-bg);
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        .social-share a:hover {
            transform: translateY(-3px);
            background-color: var(--secondary-color);
            color: white;
        }
        #backToTop {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: none;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            z-index: 100;
            transition: var(--transition);
        }
        #backToTop:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: white;
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .friend-links {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .friend-links a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
            padding: 0.25rem 0;
        }
        .friend-links a:hover {
            color: var(--secondary-color);
            padding-left: 0.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
                margin-top: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0;
                margin-top: 1rem;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                width: 100%;
            }
            .nav-links a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .hamburger {
                display: block;
            }
            .search-container {
                width: 100%;
                margin: 1rem 0 0;
            }
            .search-form input {
                min-width: unset;
                flex-grow: 1;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            html {
                font-size: 14px;
            }
            article {
                padding: 1.5rem;
            }
            .btn {
                padding: 0.75rem 1rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mt-2 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 2rem; }
        .my-2 { margin-top: 2rem; margin-bottom: 2rem; }
        .badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .update-tag {
            background-color: var(--accent-color);
        }
        .info-box {
            background-color: #e8f4fc;
            border-left: 4px solid var(--secondary-color);
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 4px 4px 0;
        }
        .warning-box {
            background-color: #fef9e7;
            border-left: 4px solid #f1c40f;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 4px 4px 0;
        }
        .tabs {
            display: flex;
            border-bottom: 2px solid var(--border-color);
            margin: 2rem 0;
        }
        .tab {
            padding: 0.75rem 1.5rem;
            background: none;
            border: none;
            cursor: pointer;
            font-weight: 500;
            color: var(--text-color);
            border-bottom: 2px solid transparent;
            margin-bottom: -2px;
            transition: var(--transition);
        }
        .tab.active {
            color: var(--secondary-color);
            border-bottom: 2px solid var(--secondary-color);
        }
        .tab-content {
            display: none;
            animation: fadeIn 0.5s;
        }
        .tab-content.active {
            display: block;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        .hero-card {
            display: grid;
            grid-template-columns: 100px 1fr;
            gap: 1rem;
            padding: 1rem;
            background-color: var(--light-bg);
            border-radius: 8px;
            margin-bottom: 1rem;
        }
        .hero-icon {
            width: 100px;
            height: 100px;
            border-radius: 8px;
            overflow: hidden;
            background-color: #ccc;
        }
        .skill-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .skill-item {
            background-color: white;
            padding: 1rem;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .skill-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }