:root {
            --primary: #5e35b1;
            --primary-dark: #4527a0;
            --secondary: #ff4081;
            --light: #f5f5f7;
            --dark: #212121;
            --gray: #757575;
            --gray-light: #e0e0e0;
            --success: #4caf50;
            --warning: #ff9800;
            --border-radius: 12px;
            --shadow: 0 8px 30px rgba(0,0,0,0.08);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --max-width: 1280px;
        }
        * {
            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);
            background-color: #fff;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            color: var(--primary-dark);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
        }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2.25rem; border-bottom: 3px solid var(--secondary); padding-bottom: 0.5rem; margin-top: 3rem; }
        h3 { font-size: 1.75rem; color: var(--primary); margin-top: 2.5rem; }
        p { margin-bottom: 1.5rem; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--secondary); }
        strong { font-weight: 700; color: var(--primary-dark); }
        em { font-style: italic; }
        ul, ol { margin-left: 1.5rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.75rem; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 2rem;
        }
        .text-center { text-align: center; }
        .btn {
            display: inline-block;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            padding: 0.9rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(94, 53, 177, 0.3);
            text-align: center;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(94, 53, 177, 0.4);
            color: white;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
        }
        .card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            border-top: 5px solid var(--secondary);
        }
        .section { padding: 4rem 0; }
        .highlight {
            background: linear-gradient(120deg, rgba(255, 64, 129, 0.1) 0%, rgba(94, 53, 177, 0.1) 100%);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--secondary);
            margin: 2rem 0;
        }
        .header {
            background: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.2rem 0;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .logo i { color: var(--secondary); }
        .logo a { color: inherit; }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--dark);
        }
        .desktop-nav a:hover {
            color: var(--secondary);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: var(--primary);
            background: none;
            border: none;
            cursor: pointer;
        }
        .mobile-nav {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: white;
            box-shadow: -5px 0 25px rgba(0,0,0,0.1);
            padding: 2rem;
            transition: right 0.4s ease;
            z-index: 1001;
        }
        .mobile-nav.active { right: 0; }
        .mobile-nav ul {
            list-style: none;
            margin-top: 3rem;
        }
        .mobile-nav li { margin-bottom: 1.5rem; }
        .mobile-nav a {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--dark);
        }
        .close-menu {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--gray);
            cursor: pointer;
        }
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
            display: none;
        }
        .overlay.active { display: block; }
        .breadcrumb {
            background: var(--light);
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            margin: 0;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li { margin: 0; font-size: 0.95rem; }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: var(--gray);
        }
        .breadcrumb a { color: var(--gray); }
        .breadcrumb a:hover { color: var(--primary); }
        .hero {
            background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
            padding: 4rem 0;
            text-align: center;
            border-bottom: 1px solid var(--gray-light);
        }
        .hero h1 { margin-bottom: 1rem; }
        .hero p {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 350px;
            gap: 3rem;
            padding: 2rem 0;
        }
        .article-content { min-height: 2000px; }
        .sidebar { position: sticky; top: 120px; height: fit-content; }
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature {
            text-align: center;
            padding: 2rem 1.5rem;
            border-radius: var(--border-radius);
            background: white;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .feature:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.12);
        }
        .feature i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        .feature h3 { font-size: 1.5rem; }
        .form-group { margin-bottom: 1.5rem; }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 0.9rem 1rem;
            border: 2px solid var(--gray-light);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(94, 53, 177, 0.2);
        }
        textarea.form-control { min-height: 150px; resize: vertical; }
        .stars { display: flex; gap: 0.5rem; margin: 1rem 0; }
        .star { font-size: 1.8rem; color: var(--gray-light); cursor: pointer; transition: var(--transition); }
        .star:hover, .star.active { color: var(--warning); }
        .comment {
            border-bottom: 1px solid var(--gray-light);
            padding: 1.5rem 0;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }
        .comment-author { font-weight: 700; color: var(--primary); }
        .comment-date { color: var(--gray); font-size: 0.9rem; }
        .comment-rating { color: var(--warning); margin-bottom: 0.5rem; }
        .article-image {
            width: 100%;
            border-radius: var(--border-radius);
            overflow: hidden;
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .article-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .article-image:hover img { transform: scale(1.03); }
        .footer-links {
            background: var(--light);
            padding: 3rem 0;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background: white;
            padding: 1.2rem;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }
        .web-link a { font-weight: 600; }
        .footer {
            background: var(--dark);
            color: white;
            padding: 3rem 0;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
        }
        .footer-logo { font-size: 1.8rem; font-weight: 700; color: white; }
        .copyright { color: var(--gray-light); font-size: 0.95rem; }
        .social-links { display: flex; gap: 1.5rem; }
        .social-links a {
            color: white;
            font-size: 1.3rem;
            transition: var(--transition);
        }
        .social-links a:hover { color: var(--secondary); }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
            .sidebar { order: -1; }
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
        }
        @media (max-width: 768px) {
            .header-content { padding: 1rem 0; }
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            .container { padding: 0 1.5rem; }
            .hero { padding: 3rem 0; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .section { padding: 3rem 0; }
            .features { grid-template-columns: 1fr; }
            .footer-content { flex-direction: column; text-align: center; }
        }