* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        :root {
            --primary-color: #ff4500;
            --secondary-color: #8b0000;
            --accent-color: #ff8c00;
            --bg-dark: #0a0a0f;
            --bg-card: rgba(20, 20, 30, 0.9);
            --text-light: #e0e0e0;
            --text-muted: #b0b0b0;
            --border-color: rgba(255, 69, 0, 0.2);
            --gradient-primary: linear-gradient(135deg, #ff4500 0%, #8b0000 100%);
            --gradient-accent: linear-gradient(135deg, #ff8c00 0%, #ff4500 100%);
        }
        
        body {
            background-color: var(--bg-dark);
            color: var(--text-light);
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            /* 添加背景图片 */
            background-image: url('/static/images/bg1.png');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            background-repeat: no-repeat;
            /* 保留原有的渐变背景作为备用/叠加 */
            background-image: 
                url('/static/images/bg1.png'),
                radial-gradient(circle at 10% 20%, rgba(139, 0, 0, 0.1) 0%, transparent 20%),
                radial-gradient(circle at 90% 80%, rgba(255, 69, 0, 0.1) 0%, transparent 20%),
                linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #0a0a0f 100%);
            /* 添加深色覆盖层，确保文字可读性 */
            position: relative;
            min-height: 100vh;
        }
        
        /* 添加半透明覆盖层，提高文字可读性 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(10, 10, 15, 0.7);
            z-index: -1;
        }
        
        /* 导航栏样式 */
        .navbar {
            background: rgba(10, 10, 15, 0.95);
            border-bottom: 1px solid var(--border-color);
            padding: 0 20px;
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(10px);
        }
        
        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }
        
        .nav-logo {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 0 10px rgba(139, 0, 0, 0.5);
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
        }
        
        .nav-item {
            position: relative;
            margin: 0 5px;
        }
        
        .nav-link {
            color: var(--text-muted);
            text-decoration: none;
            padding: 10px 15px;
            display: block;
            border-radius: 5px;
            transition: all 0.3s ease;
            font-weight: 500;
        }
        
        .nav-link:hover {
            color: var(--accent-color);
            background: rgba(255, 69, 0, 0.1);
        }
        
        .nav-link.active {
            color: var(--primary-color);
            background: rgba(255, 69, 0, 0.15);
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 80%;
        }
        
        .nav-actions {
            display: flex;
            gap: 10px;
        }
        
        .btn {
            padding: 8px 15px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        
        .btn-login {
            background: transparent;
            color: var(--accent-color);
            border: 1px solid rgba(255, 69, 0, 0.5);
        }
        
        .btn-login:hover {
            background: rgba(255, 69, 0, 0.1);
            border-color: rgba(255, 69, 0, 0.8);
        }
        
        .btn-register {
            background: var(--gradient-primary);
            color: white;
        }
        
        .btn-register:hover {
            background: linear-gradient(45deg, #9b0000, #ff5500);
            box-shadow: 0 0 15px rgba(255, 69, 0, 0.4);
        }
        
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-light);
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
            position: relative;
            z-index: 1;
        }
        
        .header {
            text-align: center;
            padding: 60px 0 40px;
            position: relative;
        }
        
        .header::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 200px;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--secondary-color), var(--primary-color), transparent);
            border-radius: 2px;
        }
        
        .page-title {
            font-size: 3.5rem;
            font-weight: 800;
            background: linear-gradient(45deg, var(--secondary-color), var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 0 20px rgba(139, 0, 0, 0.5);
            margin-bottom: 15px;
            letter-spacing: 2px;
        }
        
        .subtitle {
            font-size: 1.3rem;
            color: var(--text-muted);
            margin-bottom: 30px;
            letter-spacing: 1px;
        }
        
        /* 新版下载区域样式 */
        .download-section {
            margin-top: 40px;
        }
        
        .section-header {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
        }
        
        .section-title {
            font-size: 2.2rem;
            color: var(--primary-color);
            position: relative;
            padding-left: 20px;
        }
        
        .section-title::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 6px;
            height: 35px;
            background: var(--gradient-primary);
            border-radius: 3px;
        }
        
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .download-card {
            background: var(--bg-card);
            border-radius: 15px;
            overflow: hidden;
            transition: all 0.4s ease;
            border: 1px solid var(--border-color);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
            display: flex;
            flex-direction: column;
            position: relative;
        }
        
        .download-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--gradient-primary);
        }
        
        .download-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(255, 69, 0, 0.2);
            border-color: rgba(255, 69, 0, 0.4);
        }
        
        .download-card.featured {
            border: 2px solid var(--accent-color);
            box-shadow: 0 10px 30px rgba(255, 140, 0, 0.3);
        }
        
        .download-card.featured::before {
            background: var(--gradient-accent);
            height: 5px;
        }
        
        .download-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--gradient-accent);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            z-index: 2;
        }
        
        .download-header {
            padding: 25px 25px 15px;
            background: rgba(30, 30, 40, 0.6);
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .download-icon {
            width: 60px;
            height: 60px;
            background: var(--gradient-primary);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: white;
        }
        
        .download-card.featured .download-icon {
            background: var(--gradient-accent);
        }
        
        .download-title {
            flex: 1;
        }
        
        .download-card h3 {
            color: #fff;
            font-size: 1.5rem;
            margin-bottom: 5px;
            line-height: 1.3;
        }
        
        .download-meta {
            color: var(--text-muted);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .download-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .download-content {
            padding: 20px 25px;
            color: var(--text-light);
            line-height: 1.6;
            flex-grow: 1;
        }
        
        .download-features {
            list-style: none;
            margin: 15px 0;
        }
        
        .download-features li {
            padding: 8px 0;
            position: relative;
            padding-left: 25px;
            display: flex;
            align-items: center;
        }
        
        .download-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary-color);
            font-weight: bold;
            font-size: 1.1rem;
        }
        
        .download-actions {
            padding: 0 25px 25px;
            display: flex;
            gap: 12px;
        }
        
        .btn-download {
            flex: 2;
            background: var(--gradient-primary);
            color: white;
            text-align: center;
            padding: 14px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        
        .btn-download:hover {
            background: linear-gradient(45deg, #9b0000, #ff5500);
            box-shadow: 0 5px 15px rgba(255, 69, 0, 0.4);
            transform: translateY(-2px);
        }
        
        .btn-secondary {
            flex: 1;
            background: transparent;
            color: var(--accent-color);
            border: 1px solid rgba(255, 69, 0, 0.5);
            text-align: center;
            padding: 14px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        
        .btn-secondary:hover {
            background: rgba(255, 69, 0, 0.1);
            border-color: rgba(255, 69, 0, 0.8);
        }
        
        /* 系统要求和安装指南 */
        .info-sections {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .info-card {
            background: var(--bg-card);
            border-radius: 15px;
            padding: 30px;
            border: 1px solid var(--border-color);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
        }
        
        .info-card h3 {
            color: var(--accent-color);
            margin-bottom: 20px;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .info-card h3 i {
            color: var(--primary-color);
        }
        
        .requirements-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        
        .requirement-item {
            margin-bottom: 20px;
        }
        
        .requirement-item h4 {
            color: var(--primary-color);
            margin-bottom: 8px;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .requirement-item p {
            color: var(--text-light);
            margin-bottom: 5px;
            padding-left: 26px;
        }
        
        .steps-grid {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        
        .step-item {
            display: flex;
            gap: 15px;
            align-items: flex-start;
        }
        
        .step-number {
            width: 35px;
            height: 35px;
            background: var(--gradient-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            flex-shrink: 0;
        }
        
        .step-content h4 {
            color: var(--primary-color);
            margin-bottom: 5px;
            font-size: 1.1rem;
        }
        
        .step-content p {
            color: var(--text-light);
        }
        
        .no-news {
            text-align: center;
            padding: 40px;
            font-size: 1.2rem;
            color: #888;
            background: rgba(20, 20, 30, 0.6);
            border-radius: 10px;
            border: 1px dashed rgba(255, 69, 0, 0.3);
        }
        
        .footer {
            margin-top: 80px;
            text-align: center;
            padding: 30px 0;
            color: #666;
            border-top: 1px solid var(--border-color);
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .download-grid {
                grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            }
            
            .info-sections {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .page-title {
                font-size: 2.5rem;
            }
            
            .download-grid {
                grid-template-columns: 1fr;
            }
            
            .requirements-grid {
                grid-template-columns: 1fr;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .nav-menu {
                position: fixed;
                top: 70px;
                right: -100%;
                flex-direction: column;
                background: rgba(10, 10, 15, 0.95);
                width: 70%;
                height: calc(100vh - 70px);
                transition: 0.3s;
                padding: 20px;
                border-left: 1px solid var(--border-color);
            }
            
            .nav-menu.active {
                right: 0;
            }
            
            .nav-item {
                margin: 10px 0;
            }
            
            .nav-actions {
                flex-direction: column;
                margin-top: 20px;
            }
            
            .download-actions {
                flex-direction: column;
            }
        }
        
        @media (max-width: 480px) {
            .page-title {
                font-size: 2rem;
            }
            
            .download-header {
                flex-direction: column;
                text-align: center;
                gap: 10px;
            }
            
            .download-meta {
                justify-content: center;
            }
            
            .info-card {
                padding: 20px;
            }
        }