body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  margin: 0;
  height: 100vh;
  background: #f8f9fa;
}

#sidebar {
  width: 300px;
  background: #fff;
  border-right: 1px solid #eee;
  padding: 20px;
  display: flex;
  flex-direction: column;
  height: 100vh;           
  position: sticky;       
  top: 0;
  box-sizing: border-box;
  overflow-y: auto;       
}

#sidebar h4 {
  margin: 15px 0 5px 0;    /* 缩小标题上下边距 */
  font-size: 14px;
}

.history-item {
  padding: 2px 0;    
  font-size: 13px;
  color: #666;
  line-height: 1.4;
  overflow: hidden;
}

#main {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

input,
select,
button {
  width: 100%;
  padding: 12px;
  margin-bottom: 15px;
  border: 1px solid #ced4da;
  border-radius: 6px;
  font-size: 14px;
  box-sizing: border-box;
}

#searchBtn {
  background: #007bff;
  color: white;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
}
#searchBtn:hover {
  background: #0056b3;
}

#clearHistBtn {
  background: transparent;
  color: #dc3545;
  border: 1px solid #dc3545;
  cursor: pointer;
  margin-top: auto;
}

/* 表格样式美化 */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
td,
th {
  border: 1px solid #ebeef5;
  padding: 15px;
  text-align: left;
  line-height: 1.6;
}
td:first-child {
  width: 160px;
  background: #f5f7fa;
  color: #303133;
  font-weight: bold;
}