.chat-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 20px;
    background: #f0f2f5;
    border-radius: 12px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
 .message-group { 
display: flex; 
flex-direction: column; 
gap: 1.2rem; 
} 
/* 领导消息样式 (左侧) */ 
.leader-message { 
align-self: flex-start; 
max-width: 75%; 
} 
/* 员工消息样式 (右侧) */ 
.us...