body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

#聊天窗口 {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    border-bottom: 1px solid #ddd;
}

.消息-小易, .消息-用户 {
    max-width: 70%;
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.5;
}

.消息-小易 {
    background-color: #e5e5ea;
    color: #000;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.消息-用户 {
    background-color: #007aff;
    color: #fff;
    align-self: flex-end;
    margin-left: auto; /* 靠右对齐 */
    border-bottom-right-radius: 4px;
}

#输入区域 {
    display: flex;
    padding: 10px;
    background-color: #fff;
}

#消息输入框 {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 18px;
    resize: none;
    font-size: 16px;
    height: 40px; /* 初始高度 */
    max-height: 120px; /* 最大高度 */
}

#发送按钮 {
    background-color: #007aff;
    color: white;
    border: none;
    padding: 0 20px;
    border-radius: 18px;
    margin-left: 10px;
    cursor: pointer;
    font-size: 16px;
}

#发送按钮:hover {
    background-color: #0056b3;
}