/* 404内容区域 */
        .error-section {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 80px 0;
            background-color: var(--light);
        }
        
        .error-content {
            text-align: center;
            max-width: 700px;
            padding: 40px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
        }
        
        .error-icon {
            font-size: 6rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        
        .error-title {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        
        .error-subtitle {
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .error-description {
            margin-bottom: 30px;
            color: #666;
            line-height: 1.8;
        }
        
        .error-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--secondary);
            color: var(--dark);
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
            border: 2px solid var(--secondary);
        }
        
        .btn:hover {
            background-color: transparent;
            color: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .btn-outline {
            background-color: transparent;
            color: var(--secondary);
            border: 2px solid var(--secondary);
        }
        
        .btn-outline:hover {
            background-color: var(--secondary);
            color: var(--dark);
        }
        
   
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            nav ul {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
        }
        
        @media (max-width: 768px) {
            .error-title {
                font-size: 2.5rem;
            }
            
            .error-subtitle {
                font-size: 1.2rem;
            }
            
            .error-icon {
                font-size: 5rem;
            }
            
            .footer-bottom-content {
                flex-direction: column;
                text-align: center;
            }
            
            .friend-links {
                justify-content: center;
                margin-bottom: 20px;
            }
        }
        
        @media (max-width: 576px) {
            .logo h1 {
                font-size: 1.5rem;
            }
            
            .error-content {
                padding: 20px;
            }
            
            .error-title {
                font-size: 2rem;
            }
            
            .error-subtitle {
                font-size: 1.1rem;
            }
            
            .error-icon {
                font-size: 4rem;
            }
            
            .btn {
                padding: 10px 20px;
                width: 100%;
                margin-bottom: 10px;
            }
            
            .error-actions {
                flex-direction: column;
            }
        }