:root {
            --primary-color: #2563eb;
            --secondary-color: #7c3aed;
            --accent-color: #f59e0b;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border-color: #e5e7eb;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
            --radius: 8px;
            --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: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            text-decoration: none;
            color: var(--secondary-color);
        }
        .my-logo i {
            color: var(--accent-color);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            font-weight: 600;
            color: var(--text-dark);
        }
        .nav-desktop a:hover {
            color: var(--primary-color);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: var(--bg-white);
            padding: 1rem;
            border-top: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-dark);
            font-weight: 600;
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            background-color: var(--bg-white);
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: var(--text-light);
        }
        main {
            padding: 2rem 0;
        }
        .article-container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 1024px) {
            .article-container {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 2.5rem;
            box-shadow: var(--shadow-sm);
        }
        h1, h2, h3, h4 {
            color: var(--text-dark);
            margin-top: 2rem;
            margin-bottom: 1rem;
            line-height: 1.3;
            font-weight: 700;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
        }
        h4 {
            font-size: 1.25rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: var(--text-light);
            font-weight: 500;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fef3c7;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .article-img {
            margin: 2rem auto;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            max-width: 800px;
        }
        .article-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .article-img img:hover {
            transform: scale(1.02);
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: var(--text-light);
            padding: 0.5rem;
            font-size: 0.9rem;
        }
        ul, ol {
            margin-bottom: 1.5rem;
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .module {
            background: var(--bg-light);
            border-radius: var(--radius);
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid var(--border-color);
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 1.5rem;
        }
        .module-title i {
            color: var(--primary-color);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        label {
            font-weight: 600;
        }
        input, textarea, select {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        button, .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.875rem 1.5rem;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            width: fit-content;
        }
        button:hover, .btn:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.5rem;
            color: #d1d5db;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #fbbf24;
        }
        aside {
            align-self: start;
            position: sticky;
            top: 120px;
        }
        @media (max-width: 1024px) {
            aside {
                position: static;
            }
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 1.25rem;
            margin-top: 0;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--border-color);
        }
        .link-list {
            list-style: none;
            padding: 0;
        }
        .link-list li {
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .link-list li:last-child {
            border-bottom: none;
        }
        .link-list a {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-dark);
        }
        .link-list a:hover {
            color: var(--primary-color);
        }
        .link-list a::after {
            content: '→';
            color: var(--text-light);
        }
        .update-info {
            font-size: 0.9rem;
            color: var(--text-light);
            background: #f0f9ff;
            padding: 1rem;
            border-radius: var(--radius);
            border-left: 4px solid var(--primary-color);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-top: 0;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-section a {
            color: #d1d5db;
            display: block;
            margin-bottom: 0.75rem;
        }
        .footer-section a:hover {
            color: white;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: var(--radius);
            margin-bottom: 1rem;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.15);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #9ca3af;
            font-size: 0.9rem;
        }
        .text-bold {
            font-weight: 700;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.25rem;
        }
        .divider {
            height: 1px;
            background: var(--border-color);
            margin: 2rem 0;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
            h3 { font-size: 1.4rem; }
            article, .module, .sidebar-card { padding: 1.5rem; }
            .header-container, .breadcrumb, .container { padding-left: 15px; padding-right: 15px; }
        }