:root {
            --primary-color: #c62828;
            --secondary-color: #2e7d32;
            --dark-bg: #121212;
            --light-bg: #f5f5f5;
            --text-light: #ffffff;
            --text-dark: #333333;
            --accent-color: #ff9800;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        .site-header {
            background-color: var(--dark-bg);
            color: var(--text-light);
            padding: 1rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: var(--transition);
        }
        .my-logo:hover {
            color: var(--accent-color);
            transform: scale(1.05);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: var(--primary-color);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e0e0e0;
            padding: 0.8rem 2rem;
            font-size: 0.9rem;
            max-width: 1400px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: var(--secondary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .container {
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        main {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            color: var(--primary-color);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            border-bottom: 4px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            color: var(--secondary-color);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        h3 {
            color: var(--dark-bg);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #555;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--primary-color);
            background-color: #ffebee;
            padding: 1.2rem;
            border-left: 5px solid var(--primary-color);
            border-radius: 4px;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            font-weight: 600;
        }
        a.content-link {
            color: var(--secondary-color);
            text-decoration: none;
            border-bottom: 1px dashed var(--secondary-color);
            transition: var(--transition);
        }
        a.content-link:hover {
            color: var(--primary-color);
            border-bottom-style: solid;
            background-color: #e8f5e9;
        }
        .featured-img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 10px;
            margin: 2rem 0;
            border: 5px solid var(--dark-bg);
            transition: transform 0.5s ease;
        }
        .featured-img:hover {
            transform: scale(1.01);
        }
        .info-box {
            background: #e3f2fd;
            border-left: 5px solid #2196f3;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tip-box {
            background: #f1f8e9;
            border-left: 5px solid var(--secondary-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .interactive-section {
            background: #f9f9f9;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
            border: 1px solid #ddd;
        }
        .interactive-section h3 {
            margin-top: 0;
            color: var(--primary-color);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.2);
        }
        button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: var(--transition);
        }
        button:hover {
            background-color: #b71c1c;
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            color: var(--primary-color);
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
            margin-bottom: 1rem;
        }
        .related-links a {
            display: block;
            padding: 0.8rem;
            background: #f5f5f5;
            margin-bottom: 0.8rem;
            border-radius: 6px;
            color: var(--text-dark);
            text-decoration: none;
            transition: var(--transition);
        }
        .related-links a:hover {
            background: var(--primary-color);
            color: white;
            transform: translateX(5px);
        }
        .update-time {
            font-size: 0.9rem;
            color: #777;
            font-style: italic;
            text-align: center;
            padding: 1rem;
            background: #fff3cd;
            border-radius: 6px;
            border: 1px solid #ffeaa7;
        }
        .site-footer {
            background-color: var(--dark-bg);
            color: var(--text-light);
            padding: 3rem 2rem 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .footer-links a {
            color: #ccc;
            display: block;
            margin-bottom: 0.8rem;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: #333;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 6px;
            border-left: 5px solid var(--accent-color);
        }
        friend-link a {
            color: var(--accent-color);
            font-weight: bold;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .container {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
                text-align: center;
            }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid #444;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .container, .site-header, .breadcrumb {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            main {
                padding: 1.5rem;
            }
        }