:root {
            --primary-color: #cc0000;
            --secondary-color: #1a1a2e;
            --accent-color: #ffcc00;
            --light-bg: #f5f5f7;
            --dark-text: #222222;
            --light-text: #f8f9fa;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --max-content-width: 1200px;
            --content-padding: 2rem;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-content-width);
            margin: 0 auto;
            padding: 0 var(--content-padding);
        }
        header {
            background-color: var(--secondary-color);
            color: var(--light-text);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--box-shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Arial Black', Impact, sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--accent-color);
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: var(--transition);
        }
        .my-logo:hover {
            color: var(--primary-color);
            transform: scale(1.03);
        }
        .my-logo span {
            color: var(--primary-color);
        }
        .main-nav ul {
            display: flex;
            gap: 1.8rem;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .main-nav a:hover {
            color: var(--accent-color);
        }
        .menu-toggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
            padding: 0.5rem;
        }
        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--light-text);
            border-radius: 2px;
            transition: var(--transition);
        }
        .menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -6px);
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            display: inline-block;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: #666;
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0 4rem;
        }
        article {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .article-content {
            max-width: 100%;
        }
        aside.sidebar {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
            box-shadow: var(--box-shadow);
        }
        .sidebar h3 {
            color: var(--secondary-color);
            border-bottom: 2px solid var(--primary-color);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .sidebar ul {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .sidebar a {
            display: block;
            padding: 0.75rem;
            background-color: #fff;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--primary-color);
            transition: var(--transition);
        }
        .sidebar a:hover {
            background-color: #e9ecef;
            transform: translateX(5px);
        }
        h1, h2, h3, h4 {
            color: var(--secondary-color);
            line-height: 1.2;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        h2 {
            font-size: 2rem;
            padding-left: 0.75rem;
            border-left: 5px solid var(--primary-color);
        }
        h3 {
            font-size: 1.6rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #555;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            font-weight: 500;
            color: #333;
            background-color: #f0f8ff;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin-bottom: 2rem;
            border-left: 4px solid var(--primary-color);
        }
        .highlight {
            background-color: #fff9db;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border: 1px dashed var(--accent-color);
            margin: 2rem 0;
        }
        .highlight strong {
            color: var(--primary-color);
        }
        .article-img {
            width: 100%;
            margin: 2rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .article-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .article-img:hover img {
            transform: scale(1.02);
        }
        .article-img figcaption {
            text-align: center;
            font-style: italic;
            padding: 0.8rem;
            background-color: var(--light-bg);
            color: #666;
            font-size: 0.9rem;
        }
        .content-link {
            color: var(--primary-color);
            font-weight: 600;
            border-bottom: 1px dotted var(--primary-color);
            transition: var(--transition);
        }
        .content-link:hover {
            color: #990000;
            border-bottom-style: solid;
        }
        .user-interaction {
            background-color: var(--light-bg);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            box-shadow: var(--box-shadow);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .interaction-box {
            background-color: #fff;
            padding: 1.8rem;
            border-radius: var(--border-radius);
            border-top: 4px solid var(--primary-color);
        }
        .interaction-box h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .interaction-box h3 i {
            color: var(--primary-color);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        input, textarea, select {
            padding: 0.9rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(204, 0, 0, 0.1);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 0.5rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating input:checked ~ label {
            color: #ddd;
        }
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffcc00;
        }
        .rating input:checked + label {
            color: #ffcc00;
        }
        button, .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 1rem 1.8rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        button:hover, .btn:hover {
            background-color: #990000;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        footer {
            background-color: var(--secondary-color);
            color: var(--light-text);
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h3 {
            color: var(--accent-color);
            border-bottom: 2px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 0.75rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .footer-links a {
            color: #ccc;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 6px;
            margin-bottom: 0.8rem;
            border-left: 3px solid var(--primary-color);
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        .last-updated {
            background-color: #e7f3ff;
            padding: 0.75rem;
            border-radius: var(--border-radius);
            margin-top: 2rem;
            text-align: center;
            font-style: italic;
            color: #0066cc;
            font-weight: 500;
        }
        @media (max-width: 992px) {
            article {
                grid-template-columns: 1fr;
            }
            aside.sidebar {
                position: static;
                order: -1;
            }
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: var(--secondary-color);
                padding: 2rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease;
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .main-nav ul {
                flex-direction: column;
                gap: 1.5rem;
                align-items: center;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            :root {
                --content-padding: 1rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .user-interaction {
                padding: 1.5rem;
            }
        }