:root {
            --primary-color: #1a365d;
            --secondary-color: #2d3748;
            --accent-color: #3182ce;
            --light-bg: #f7fafc;
            --border-color: #e2e8f0;
            --text-color: #2d3748;
            --text-light: #718096;
            --white: #ffffff;
            --success: #38a169;
            --warning: #dd6b20;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --radius: 8px;
        }
        * {
            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, Cantarell, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--white);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 1rem 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent-color);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        nav a {
            color: var(--text-color);
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0.75rem;
            border-radius: var(--radius);
            transition: all 0.3s ease;
            min-height: 44px;
            min-width: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        nav a:hover {
            background-color: var(--light-bg);
            color: var(--accent-color);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary-color);
            cursor: pointer;
            min-height: 44px;
            min-width: 44px;
            align-items: center;
            justify-content: center;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem 0;
        }
        .content {
            grid-column: 1;
        }
        aside {
            grid-column: 2;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            color: var(--secondary-color);
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--secondary-color);
            margin: 1.5rem 0 0.75rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--text-color);
            margin: 1rem 0 0.5rem;
        }
        p {
            margin-bottom: 1rem;
        }
        .card {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
        }
        .info-box {
            background-color: var(--light-bg);
            border-left: 4px solid var(--accent-color);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 1rem 0;
            display: block;
        }
        .image-caption {
            font-size: 0.9rem;
            color: var(--text-light);
            text-align: center;
            margin-top: 0.5rem;
            font-style: italic;
        }
        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 {
            border: 1px solid var(--border-color);
            padding: 0.75rem;
            text-align: left;
        }
        th {
            background-color: var(--light-bg);
            font-weight: 600;
        }
        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: var(--radius);
            font-family: inherit;
            font-size: 1rem;
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        button {
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius);
            cursor: pointer;
            font-size: 1rem;
            font-weight: 500;
            transition: background-color 0.3s ease;
            min-height: 44px;
            min-width: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        button:hover {
            background-color: var(--primary-color);
        }
        .rating {
            display: flex;
            gap: 0.25rem;
            margin: 1rem 0;
        }
        .star {
            color: #e2e8f0;
            cursor: pointer;
            font-size: 1.5rem;
            transition: color 0.2s;
            min-height: 44px;
            min-width: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .star.active {
            color: #fbbf24;
        }
        .social-share {
            display: flex;
            gap: 0.75rem;
            margin: 1.5rem 0;
        }
        .social-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            color: white;
            text-decoration: none;
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }
        .social-btn:hover {
            transform: translateY(-3px);
        }
        .facebook { background-color: #3b5998; }
        .twitter { background-color: #1da1f2; }
        .whatsapp { background-color: #25d366; }
        .linkedin { background-color: #0077b5; }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background-color: var(--accent-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            box-shadow: var(--shadow);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        footer {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid var(--border-color);
            color: var(--text-light);
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .friend-links {
            margin: 1.5rem 0;
            padding: 1rem;
            background-color: var(--light-bg);
            border-radius: var(--radius);
        }
        .friend-links a {
            color: var(--accent-color);
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            padding: 0.5rem;
            border-radius: 4px;
            transition: background-color 0.3s;
        }
        .friend-links a:hover {
            background-color: rgba(49, 130, 206, 0.1);
        }
        .copyright {
            text-align: center;
            padding: 1.5rem 0;
            font-size: 0.9rem;
            border-top: 1px solid var(--border-color);
        }
        @media (max-width: 768px) {
            body {
                padding: 0 15px;
            }
            main {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            aside {
                grid-column: 1;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            nav {
                width: 100%;
                margin-top: 1rem;
                display: none;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 0.5rem;
            }
            .hamburger {
                display: flex;
                position: absolute;
                top: 1rem;
                right: 0;
            }
            .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 44px;
                height: 44px;
            }
        }
        @media print {
            .social-share,
            .back-to-top,
            form,
            button {
                display: none;
            }
        }