:root {
            --primary-color: #003366;
            --secondary-color: #cc0000;
            --accent-color: #ffcc00;
            --light-color: #f5f5f5;
            --dark-color: #222222;
            --text-color: #333333;
            --gray-light: #eaeaea;
            --gray-medium: #888888;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --max-width: 1200px;
            --sidebar-width: 280px;
        }
        * {
            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(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            color: var(--primary-color);
            line-height: 1.3;
            margin-bottom: 1rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 1.5rem;
        }
        h2 {
            font-size: 1.8rem;
            margin-top: 2.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--gray-light);
        }
        h3 {
            font-size: 1.4rem;
            margin-top: 1.8rem;
            color: var(--secondary-color);
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1.2rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        a {
            color: var(--secondary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        ul, ol {
            padding-left: 1.5rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        blockquote {
            border-left: 4px solid var(--accent-color);
            padding-left: 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--gray-medium);
        }
        code {
            background-color: var(--gray-light);
            padding: 0.2rem 0.4rem;
            border-radius: 4px;
            font-family: monospace;
            font-size: 0.9rem;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .btn {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            border: none;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
            min-height: 44px;
            min-width: 44px;
            line-height: 1.2;
        }
        .btn:hover {
            background-color: var(--primary-color);
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: var(--box-shadow);
        }
        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }
        .btn-outline:hover {
            background-color: var(--primary-color);
            color: white;
        }
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.5rem;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: var(--primary-color);
            text-decoration: none;
        }
        .logo span {
            color: var(--secondary-color);
        }
        .logo:hover {
            text-decoration: none;
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .nav-links a {
            color: var(--dark-color);
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--secondary-color);
            text-decoration: none;
        }
        .nav-links a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--secondary-color);
            transition: width 0.3s;
        }
        .nav-links a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
            background: none;
            border: none;
            padding: 0.5rem;
            min-height: 44px;
            min-width: 44px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
            transition: var(--transition);
        }
        main {
            display: grid;
            grid-template-columns: 1fr var(--sidebar-width);
            gap: 2.5rem;
            padding: 2rem 0;
        }
        .content {
            grid-column: 1;
        }
        aside {
            grid-column: 2;
        }
        .section {
            margin-bottom: 3rem;
            padding: 1.5rem;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .highlight {
            background-color: #f0f8ff;
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .info-box {
            background-color: #fff9e6;
            border: 1px solid var(--accent-color);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin: 1.5rem 0;
            float: right;
            width: 300px;
            margin-left: 1.5rem;
            margin-bottom: 1rem;
        }
        .info-box h3 {
            margin-top: 0;
            color: var(--primary-color);
        }
        .image-container {
            margin: 1.5rem 0;
            text-align: center;
        }
        .image-container img {
            margin: 0 auto;
        }
        .image-caption {
            font-size: 0.9rem;
            color: var(--gray-medium);
            margin-top: 0.5rem;
            font-style: italic;
        }
        .table-container {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 1rem 0;
        }
        th, td {
            border: 1px solid var(--gray-light);
            padding: 0.8rem;
            text-align: left;
        }
        th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        .sidebar-widget {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.2rem;
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }
        .quick-links {
            list-style: none;
            padding-left: 0;
        }
        .quick-links li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed var(--gray-light);
        }
        .quick-links li:last-child {
            border-bottom: none;
        }
        .quick-links a {
            display: block;
            padding: 0.3rem 0;
        }
        .rating-stars {
            color: var(--accent-color);
            font-size: 1.5rem;
            margin: 0.5rem 0;
        }
        .social-share {
            display: flex;
            gap: 0.8rem;
            margin-top: 1rem;
        }
        .social-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: var(--gray-light);
            color: var(--dark-color);
            transition: var(--transition);
        }
        .social-share a:hover {
            background-color: var(--primary-color);
            color: white;
            text-decoration: none;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, select, textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid var(--gray-light);
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary-color);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .comment {
            border-bottom: 1px solid var(--gray-light);
            padding: 1.2rem 0;
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary-color);
        }
        .comment-date {
            font-size: 0.85rem;
            color: var(--gray-medium);
            margin-left: 0.5rem;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        .footer-links {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.7rem;
        }
        .footer-links a {
            color: #cccccc;
        }
        .footer-links a:hover {
            color: white;
            text-decoration: underline;
        }
        friend-link {
            display: block;
            margin-bottom: 0.7rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            font-size: 1.5rem;
            text-decoration: none;
            min-height: 44px;
            min-width: 44px;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            text-decoration: none;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            aside {
                grid-column: 1;
            }
            .info-box {
                float: none;
                width: 100%;
                margin-left: 0;
            }
        }
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            h3 { font-size: 1.3rem; }
            .header-container {
                flex-wrap: wrap;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                padding: 1.5rem;
                z-index: 999;
                gap: 1rem;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: flex;
            }
            .hamburger.active span:nth-child(1) {
                transform: rotate(45deg) translate(5px, 5px);
            }
            .hamburger.active span:nth-child(2) {
                opacity: 0;
            }
            .hamburger.active span:nth-child(3) {
                transform: rotate(-45deg) translate(7px, -6px);
            }
            .section {
                padding: 1.2rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .back-to-top {
                bottom: 1rem;
                right: 1rem;
            }
        }
        @media (max-width: 480px) {
            html { font-size: 14px; }
            .container { padding: 0 1rem; }
            .btn { padding: 0.7rem 1.2rem; }
        }
        @media print {
            header, aside, .social-share, .back-to-top, footer, .comment-form, .search-form {
                display: none;
            }
            main {
                grid-template-columns: 1fr;
            }
            body {
                color: black;
                background: white;
            }
            a {
                color: black;
                text-decoration: underline;
            }
        }