:root {
            --primary: #c62828;
            --primary-dark: #8e0000;
            --secondary: #212121;
            --accent: #ff6f00;
            --light: #f5f5f5;
            --gray: #757575;
            --success: #2e7d32;
            --warning: #ff9800;
            --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-main);
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
            color: var(--light);
            overflow-x: hidden;
        }
        .site-header {
            background: rgba(10, 10, 10, 0.95);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 2px solid var(--primary);
            box-shadow: 0 5px 20px rgba(198, 40, 40, 0.2);
        }
        .header-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2.2rem;
            background: linear-gradient(45deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: transform 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .my-logo i {
            font-size: 2.5rem;
            color: var(--primary);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            color: var(--light);
            text-decoration: none;
            font-weight: 600;
            font-size: 1rem;
            padding: 8px 15px;
            border-radius: 4px;
            transition: all 0.3s ease;
            position: relative;
        }
        .main-nav a:hover {
            background: var(--primary);
            color: white;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 80%;
        }
        .search-container {
            position: relative;
            width: 300px;
        }
        .search-form {
            display: flex;
        }
        .search-input {
            width: 100%;
            padding: 12px 20px;
            border: 2px solid var(--primary);
            border-radius: 30px 0 0 30px;
            background: rgba(255, 255, 255, 0.1);
            color: var(--light);
            font-size: 1rem;
            outline: none;
            transition: all 0.3s ease;
        }
        .search-input:focus {
            background: rgba(255, 255, 255, 0.15);
            border-color: var(--accent);
        }
        .search-button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }
        .search-button:hover {
            background: var(--primary-dark);
            transform: scale(1.05);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
            background: transparent;
            border: none;
            padding: 10px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background: var(--primary);
            transition: 0.3s;
            border-radius: 2px;
        }
        .breadcrumb {
            background: rgba(33, 33, 33, 0.8);
            padding: 15px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .breadcrumb ol {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            list-style: none;
            gap: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--light);
            text-decoration: none;
            transition: color 0.3s;
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb i {
            font-size: 0.8rem;
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 30px 20px;
            display: grid;
            grid-template-columns: 1fr 350px;
            gap: 40px;
        }
        .main-content {
            background: rgba(25, 25, 25, 0.9);
            border-radius: 15px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border: 1px solid rgba(255, 111, 0, 0.2);
        }
        .article-header {
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid var(--primary);
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: white;
            line-height: 1.2;
            background: linear-gradient(45deg, white, var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .meta-info {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .update-time {
            color: var(--accent);
            font-weight: 600;
        }
        .content-section {
            margin-bottom: 50px;
            padding: 25px;
            background: rgba(40, 40, 40, 0.7);
            border-radius: 10px;
            border-left: 4px solid var(--primary);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .content-section:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(198, 40, 40, 0.2);
        }
        h2 {
            font-size: 2rem;
            margin-bottom: 20px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        h2 i {
            color: var(--accent);
        }
        h3 {
            font-size: 1.5rem;
            margin: 25px 0 15px;
            color: var(--accent);
            border-bottom: 1px solid rgba(255, 111, 0, 0.3);
            padding-bottom: 8px;
        }
        h4 {
            font-size: 1.2rem;
            margin: 20px 0 10px;
            color: #e0e0e0;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.05rem;
            text-align: justify;
        }
        .highlight {
            background: linear-gradient(90deg, rgba(198, 40, 40, 0.2), transparent);
            padding: 15px 20px;
            border-left: 4px solid var(--accent);
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 25px 0;
        }
        .feature-item {
            background: rgba(255, 111, 0, 0.1);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid rgba(255, 111, 0, 0.3);
        }
        .feature-item h4 {
            color: var(--accent);
            margin-top: 0;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            margin: 30px auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
            transition: transform 0.3s ease;
        }
        .article-image:hover {
            transform: scale(1.02);
        }
        .article-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .article-image img:hover {
            transform: scale(1.05);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            padding: 0 10px;
        }
        .content-link {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dashed var(--accent);
            transition: all 0.3s ease;
            padding: 0 2px;
        }
        .content-link:hover {
            color: white;
            background: var(--primary);
            border-bottom-color: transparent;
            border-radius: 3px;
        }
        .sidebar {
            background: rgba(25, 25, 25, 0.9);
            border-radius: 15px;
            padding: 30px;
            height: fit-content;
            position: sticky;
            top: 100px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border: 1px solid rgba(255, 111, 0, 0.2);
        }
        .sidebar-section {
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .sidebar-section h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--primary);
        }
        .rating-system {
            text-align: center;
            padding: 25px;
            background: rgba(40, 40, 40, 0.7);
            border-radius: 10px;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 20px 0;
            font-size: 2rem;
            color: var(--gray);
        }
        .star {
            cursor: pointer;
            transition: color 0.3s, transform 0.3s;
        }
        .star:hover {
            color: var(--accent);
            transform: scale(1.2);
        }
        .star.active {
            color: gold;
        }
        .rating-form {
            margin-top: 20px;
        }
        .rating-form button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            width: 100%;
        }
        .rating-form button:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }
        .comment-form {
            background: rgba(40, 40, 40, 0.7);
            padding: 25px;
            border-radius: 10px;
            margin-top: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--light);
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 6px;
            color: var(--light);
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent);
            background: rgba(255, 255, 255, 0.15);
            box-shadow: 0 0 0 3px rgba(255, 111, 0, 0.1);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .submit-btn {
            background: linear-gradient(45deg, var(--primary), var(--accent));
            color: white;
            border: none;
            padding: 15px 40px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 700;
            font-size: 1rem;
            transition: all 0.3s ease;
            width: 100%;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(198, 40, 40, 0.3);
        }
        .site-footer {
            background: #0a0a0a;
            padding: 50px 0 20px;
            margin-top: 60px;
            border-top: 2px solid var(--primary);
        }
        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: var(--primary);
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: var(--gray);
            text-decoration: none;
            transition: color 0.3s, padding-left 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(33, 33, 33, 0.8);
            padding: 30px;
            border-radius: 10px;
            margin: 30px 0;
            border: 1px solid rgba(255, 111, 0, 0.3);
        }
        friend-link h3 {
            color: var(--accent);
            margin-bottom: 20px;
            text-align: center;
        }
        .friend-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
        }
        .friend-link-item {
            background: rgba(255, 111, 0, 0.1);
            padding: 12px 15px;
            border-radius: 6px;
            text-align: center;
            transition: all 0.3s ease;
        }
        .friend-link-item:hover {
            background: rgba(255, 111, 0, 0.2);
            transform: translateY(-3px);
        }
        .friend-link-item a {
            color: var(--light);
            text-decoration: none;
            font-weight: 600;
            display: block;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: var(--gray);
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .container {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                margin-top: 40px;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                height: 70px;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            .hamburger {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(10, 10, 10, 0.98);
                padding: 20px;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.3s ease;
                z-index: 999;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .search-container {
                width: 100%;
                margin-top: 20px;
            }
            .hamburger.active span:nth-child(1) {
                transform: rotate(45deg) translate(6px, 6px);
            }
            .hamburger.active span:nth-child(2) {
                opacity: 0;
            }
            .hamburger.active span:nth-child(3) {
                transform: rotate(-45deg) translate(6px, -6px);
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .main-content, .sidebar {
                padding: 25px;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 20px 15px;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .main-content, .sidebar {
                padding: 20px;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .content-section {
            animation: fadeInUp 0.6s ease-out;
        }
        .download-cta {
            text-align: center;
            padding: 40px;
            background: linear-gradient(135deg, rgba(198, 40, 40, 0.2), rgba(255, 111, 0, 0.2));
            border-radius: 15px;
            margin: 40px 0;
            border: 2px dashed var(--accent);
        }
        .download-cta h2 {
            color: white;
            margin-bottom: 20px;
        }
        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 15px;
            background: linear-gradient(45deg, var(--primary), var(--accent));
            color: white;
            padding: 18px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.2rem;
            margin-top: 20px;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px rgba(198, 40, 40, 0.3);
        }
        .download-btn:hover {
            transform: translateY(-5px) scale(1.05);
            box-shadow: 0 15px 30px rgba(198, 40, 40, 0.4);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-item {
            text-align: center;
            padding: 25px;
            background: rgba(255, 111, 0, 0.1);
            border-radius: 10px;
            border: 1px solid rgba(255, 111, 0, 0.3);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 10px;
        }
        .stat-label {
            color: var(--gray);
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            background: rgba(40, 40, 40, 0.7);
            border-radius: 10px;
            overflow: hidden;
        }
        .comparison-table th,
        .comparison-table td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .comparison-table th {
            background: var(--primary);
            color: white;
            font-weight: 600;
        }
        .comparison-table tr:hover {
            background: rgba(255, 111, 0, 0.1);
        }
        .tooltip {
            position: relative;
            display: inline-block;
            border-bottom: 1px dotted var(--accent);
            cursor: help;
        }
        .tooltip .tooltiptext {
            visibility: hidden;
            width: 300px;
            background: rgba(10, 10, 10, 0.95);
            color: white;
            text-align: center;
            padding: 15px;
            border-radius: 6px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
            border: 1px solid var(--primary);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
            box-shadow: 0 5px 15px rgba(198, 40, 40, 0.3);
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-5px);
        }