/* CSS Reset & Base */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #e74c3c;
            --accent-color: #3498db;
            --light-color: #ecf0f1;
            --dark-color: #1a252f;
            --text-color: #333;
            --border-color: #ddd;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        
        /* Typography */
        h1, h2, h3, h4 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 0.5rem;
        }
        
        h2 {
            font-size: 2rem;
            margin-top: 2.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-color);
        }
        
        h3 {
            font-size: 1.5rem;
            margin-top: 2rem;
        }
        
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        
        a {
            color: var(--accent-color);
            text-decoration: none;
            transition: var(--transition);
        }
        
        a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        
        /* Layout */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        
        /* Header */
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        
        .logo a {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--secondary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .logo i {
            color: var(--primary-color);
        }
        
        /* Navigation */
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        
        nav a {
            font-weight: 600;
            color: var(--primary-color);
            padding: 0.5rem 0;
            position: relative;
        }
        
        nav a:hover {
            text-decoration: none;
            color: var(--secondary-color);
        }
        
        nav a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
            transition: var(--transition);
        }
        
        nav a:hover::after {
            width: 100%;
        }
        
        /* Hamburger Menu */
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
        }
        
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: var(--primary-color);
            transition: var(--transition);
        }
        
        /* Main Content Layout */
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        
        .content {
            background: white;
            padding: 2.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        
        /* Sidebar */
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        
        .info-box {
            border: 2px solid var(--border-color);
            border-radius: 6px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        
        .info-box h3 {
            text-align: center;
            margin-top: 0;
        }
        
        .info-box img {
            width: 100%;
            height: auto;
            border-radius: 4px;
            margin-bottom: 1rem;
        }
        
        /* Sections */
        section {
            margin-bottom: 3rem;
        }
        
        /* Lists */
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        
        li {
            margin-bottom: 0.5rem;
        }
        
        /* Tables */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        th, td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        th {
            background-color: #f2f2f2;
            font-weight: 600;
        }
        
        tr:hover {
            background-color: #f9f9f9;
        }
        
        /* Images */
        .image-container {
            margin: 2rem 0;
            text-align: center;
        }
        
        .image-container img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        
        /* Buttons */
        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            min-height: 44px;
            min-width: 44px;
        }
        
        .btn:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        
        .btn-secondary {
            background-color: var(--light-color);
            color: var(--primary-color);
        }
        
        /* Forms */
        form {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        
        .form-group {
            margin-bottom: 1.2rem;
        }
        
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        
        input, select, textarea {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
        }
        
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--accent-color);
        }
        
        /* Rating */
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        
        .star {
            color: #ddd;
            cursor: pointer;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        
        /* Social Share */
        .social-share {
            display: flex;
            gap: 1rem;
            margin: 2rem 0;
        }
        
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: var(--light-color);
            color: var(--primary-color);
            transition: var(--transition);
        }
        
        .social-icon:hover {
            background-color: var(--accent-color);
            color: white;
            transform: translateY(-3px);
        }
        
        /* Back to Top */
        #backToTop {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background-color: var(--secondary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        
        #backToTop.show {
            opacity: 1;
            visibility: visible;
        }
        
        #backToTop:hover {
            background-color: var(--primary-color);
        }
        
        /* Footer */
        footer {
            background-color: var(--dark-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;
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-top: 1rem;
        }
        
        .friend-link {
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        
        .friend-link:hover {
            background: rgba(255,255,255,0.2);
        }
        
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        
        /* Author & EEAT */
        .author-box {
            background: #f0f7ff;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        
        .author-info {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .author-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--accent-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 2rem;
        }
        
        /* Update Log */
        .update-log {
            background: #fff8e1;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        
        .update-item {
            border-left: 3px solid #ffb300;
            padding-left: 1rem;
            margin-bottom: 1.5rem;
        }
        
        /* FAQ */
        .faq-item {
            background: white;
            border-radius: 8px;
            margin-bottom: 1rem;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        
        .faq-question {
            padding: 1.5rem;
            background: #f8f9fa;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-answer {
            padding: 1.5rem;
            display: none;
        }
        
        .faq-item.active .faq-answer {
            display: block;
        }
        
        /* Responsive Design */
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            
            aside {
                position: static;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            h2 {
                font-size: 1.8rem;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            
            nav {
                width: 100%;
                order: 3;
                margin-top: 1rem;
                display: none;
            }
            
            nav.active {
                display: block;
            }
            
            nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            
            .hamburger {
                display: flex;
            }
            
            .content {
                padding: 1.5rem;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
            }
            
            .social-share {
                justify-content: center;
            }
        }
        
        @media (max-width: 480px) {
            .container {
                padding: 0 1rem;
            }
            
            h1 {
                font-size: 1.8rem;
            }
            
            h2 {
                font-size: 1.5rem;
            }
            
            .btn {
                padding: 0.6rem 1.2rem;
                font-size: 0.9rem;
            }
        }
        
        /* Print Styles */
        @media print {
            header, footer, aside, .social-share, #backToTop {
                display: none;
            }
            
            body {
                background: white;
                color: black;
            }
            
            .content {
                box-shadow: none;
                padding: 0;
            }
            
            a {
                color: black;
                text-decoration: underline;
            }
        }