* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a365d;
            --secondary-color: #2d3748;
            --accent-color: #e53e3e;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --text-color: #2d3748;
            --light-text: #718096;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --container-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: #fff;
            font-size: 16px;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            margin-top: 2.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        h3 {
            font-size: 1.5rem;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.25rem;
            margin-top: 1.5rem;
        }
        p {
            margin-bottom: 1.25rem;
        }
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .my-logo i {
            margin-right: 0.5rem;
            color: var(--accent-color);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            width: 44px;
            height: 44px;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2rem 0;
        }
        .content-area {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: var(--light-color);
            padding: 1.5rem;
            border-radius: 8px;
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .info-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
        }
        .section-highlight {
            background: linear-gradient(135deg, #f6f9ff 0%, #f0f4ff 100%);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--light-text);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            background: white;
            box-shadow: var(--shadow);
            border-radius: 8px;
            overflow: hidden;
        }
        th, td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }
        tr:hover {
            background-color: rgba(0, 0, 0, 0.02);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        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-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.1);
        }
        .btn {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background-color: var(--accent-color);
            color: white;
            border: none;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            text-align: center;
            min-height: 44px;
            min-width: 44px;
        }
        .btn:hover {
            background-color: #c53030;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .btn-secondary {
            background-color: var(--primary-color);
        }
        .btn-secondary:hover {
            background-color: #2a4365;
        }
        .rating-stars {
            display: flex;
            gap: 0.25rem;
            margin: 1rem 0;
        }
        .star {
            color: #e2e8f0;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: #f6ad55;
        }
        .social-share {
            display: flex;
            gap: 1rem;
            margin: 2rem 0;
        }
        .social-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            color: white;
            text-decoration: none;
            transition: var(--transition);
        }
        .facebook { background-color: #1877f2; }
        .twitter { background-color: #1da1f2; }
        .whatsapp { background-color: #25d366; }
        .linkedin { background-color: #0077b5; }
        .social-btn:hover {
            transform: translateY(-3px);
            opacity: 0.9;
        }
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background-color: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.25rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.1);
            padding: 1rem;
            border-radius: 4px;
            margin-bottom: 0.75rem;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        friend-link a {
            color: white;
            text-decoration: none;
            font-weight: 500;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #cbd5e0;
            font-size: 0.9rem;
        }
        .update-log {
            background: #fff8e1;
            border: 1px solid #ffd54f;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        .update-item {
            padding: 1rem;
            border-bottom: 1px solid #ffecb3;
        }
        .update-item:last-child {
            border-bottom: none;
        }
        .update-date {
            font-weight: 600;
            color: var(--accent-color);
            display: block;
            margin-bottom: 0.5rem;
        }
        .faq-item {
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
        }
        .faq-question {
            padding: 1.25rem;
            background: var(--light-color);
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: #edf2f7;
        }
        .faq-answer {
            padding: 1.25rem;
            display: none;
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0.5rem;
            }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-radius: 4px;
                background: rgba(255, 255, 255, 0.05);
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.75rem;
            }
            h3 {
                font-size: 1.35rem;
            }
            .social-share {
                justify-content: center;
                flex-wrap: wrap;
            }
            .back-to-top {
                bottom: 1rem;
                right: 1rem;
                width: 45px;
                height: 45px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 1rem;
            }
            .content-area, .sidebar {
                padding: 1rem;
            }
            table {
                display: block;
                overflow-x: auto;
            }
            .btn {
                width: 100%;
                margin-bottom: 0.5rem;
            }
        }
        @media print {
            .main-nav, .sidebar, .social-share, .back-to-top, .comment-form, footer {
                display: none;
            }
            body {
                font-size: 12pt;
                color: black;
            }
            .content-area {
                box-shadow: none;
                padding: 0;
            }
        }