:root {
            --primary: #3a86ff;
            --primary-dark: #2667cc;
            --secondary: #ff006e;
            --accent: #8338ec;
            --dark: #1a1a2e;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #38b000;
            --border-radius: 12px;
            --shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            line-height: 1.6;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #333;
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul, ol {
            list-style-position: inside;
            padding-left: 1.2em;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background-color: var(--dark);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--primary);
        }
        .logo span {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .nav-desktop {
            display: flex;
            gap: 30px;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            font-weight: 600;
            padding: 8px 0;
            position: relative;
        }
        .nav-desktop a:hover {
            color: var(--primary);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--primary);
            transition: var(--transition);
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background-color: var(--dark);
            padding: 20px;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile ul {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .nav-mobile a {
            font-weight: 600;
            font-size: 1.1rem;
            display: block;
            padding: 10px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .nav-mobile a:hover {
            color: var(--primary);
            padding-left: 15px;
        }
        .breadcrumb {
            background-color: #f1f3f5;
            padding: 15px 0;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb .container {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--gray);
        }
        main {
            padding: 40px 0;
            background-color: #fff;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        article {
            line-height: 1.7;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 10px;
            border-bottom: 2px solid #e9ecef;
        }
        h3 {
            font-size: 1.6rem;
            color: var(--accent);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--dark);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.05rem;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--dark);
            background: #f8f9fa;
            padding: 20px;
            border-left: 5px solid var(--primary);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fff9db;
            padding: 20px;
            border-radius: var(--border-radius);
            border-left: 5px solid #ffd43b;
            margin: 2rem 0;
        }
        .highlight strong {
            color: #e67700;
        }
        .figure {
            margin: 2.5rem 0;
            text-align: center;
        }
        .figure img {
            box-shadow: var(--shadow);
            margin: 0 auto 15px;
        }
        .figcaption {
            font-style: italic;
            color: var(--gray);
            font-size: 0.95rem;
            margin-top: 10px;
        }
        blockquote {
            border-left: 4px solid var(--secondary);
            padding-left: 25px;
            margin: 2rem 0;
            font-style: italic;
            color: #555;
            background: #f8f9fa;
            padding: 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .stats-box {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .stats-box h3 {
            color: white;
            margin-top: 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        .stat-item {
            text-align: center;
            padding: 15px;
            background: rgba(255,255,255,0.1);
            border-radius: 10px;
        }
        .stat-value {
            font-size: 2.5rem;
            font-weight: 800;
            display: block;
            line-height: 1;
        }
        .stat-label {
            font-size: 0.9rem;
            opacity: 0.9;
        }
        .btn {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(58, 134, 255, 0.3);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #d1005c;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            margin-top: 0;
            margin-bottom: 20px;
            color: var(--dark);
            padding-bottom: 10px;
            border-bottom: 2px solid #dee2e6;
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid #ced4da;
            border-radius: 50px 0 0 50px;
            font-size: 1rem;
            outline: none;
        }
        .search-form input:focus {
            border-color: var(--primary);
        }
        .search-form button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 50px 50px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: var(--primary-dark);
        }
        .related-links ul {
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed #dee2e6;
        }
        .related-links a {
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .related-links i {
            color: var(--accent);
        }
        .user-interaction {
            margin-top: 50px;
            border-top: 1px solid #dee2e6;
            padding-top: 40px;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }
        .interaction-card {
            background-color: #f8f9fa;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .interaction-card h3 {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 0;
        }
        .interaction-card form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 20px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-group label {
            font-weight: 600;
            color: var(--dark);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            padding: 12px 18px;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(58, 134, 255, 0.2);
        }
        .form-group textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 5px;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffc107;
        }
        footer {
            background-color: var(--dark);
            color: #adb5bd;
            padding: 50px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background-color: var(--primary);
        }
        .footer-col ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-col li {
            margin-bottom: 12px;
        }
        .footer-col a {
            color: #adb5bd;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin-top: 15px;
            padding: 15px;
            background: rgba(255,255,255,0.05);
            border-radius: 8px;
            border-left: 4px solid var(--primary);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #6c757d;
        }
        .text-center { text-align: center; }
        .mt-4 { margin-top: 2rem; }
        .mb-4 { margin-bottom: 2rem; }
        .py-4 { padding-top: 2rem; padding-bottom: 2rem; }
        .bold { font-weight: 800; }
        .keyword { color: var(--primary); font-weight: 700; }
        .emoji { font-size: 1.2em; }