:root {
            --primary-color: #3498db;
            --secondary-color: #2c3e50;
            --accent-color: #f39c12;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --success-color: #2ecc71;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f7fa;
        }
        
        /* 导航栏样式 */
        .navbar {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 0.8rem 0;
        }
        
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: white !important;
        }
        
        .navbar-nav .nav-link {
            color: rgba(255, 255, 255, 0.85) !important;
            font-weight: 500;
            padding: 0.5rem 1rem;
            margin: 0 0.2rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        
        .navbar-nav .nav-link:hover, 
        .navbar-nav .nav-link.active {
            color: white !important;
            background-color: rgba(255, 255, 255, 0.15);
        }
        
        .navbar-toggler {
            border: none;
            color: white;
        }
        
        /* 页脚样式 */
        .footer {
            background: var(--secondary-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        
        .footer h5 {
            font-weight: 600;
            margin-bottom: 1.2rem;
            color: var(--accent-color);
        }
        
        .footer a {
            color: rgba(255, 255, 255, 0.8);
            transition: var(--transition);
        }
        
        .footer a:hover {
            color: white;
            text-decoration: none;
        }
        
        .footer ul li {
            margin-bottom: 0.5rem;
        }
        
        .grey-color {
            color: rgba(255, 255, 255, 0.7);
        }