body * {
  box-sizing: border-box;
  flex-shrink: 0;
}
body {
  margin:0;
  padding:0;
  font-family: PingFangSC-Regular, Roboto, Helvetica Neue, Helvetica, Tahoma,
    Arial, PingFang SC-Light, Microsoft YaHei;
}
input {
  background-color: transparent;
  border: 0;
}
button {
  margin: 0;
  padding: 0;
  border: 1px solid transparent;
  outline: none;
  background-color: transparent;
}

button:active {
  opacity: 0.6;
}
.flex-col {
  display: flex;
  flex-direction: column;
}
.flex-row {
  display: flex;
  flex-direction: row;
}
.justify-start {
  display: flex;
  justify-content: flex-start;
}
.justify-center {
  display: flex;
  justify-content: center;
}

.justify-end {
  display: flex;
  justify-content: flex-end;
}
.justify-evenly {
  display: flex;
  justify-content: space-evenly;
}
.justify-around {
  display: flex;
  justify-content: space-around;
}
.justify-between {
  display: flex;
  justify-content: space-between;
}
.align-start {
  display: flex;
  align-items: flex-start;
}
.align-center {
  display: flex;
  align-items: center;
}
.align-end {
  display: flex;
  align-items: flex-end;
}


.header {
  height: 70px;
  display: flex;
  gap:3vw;
  color:#4e80b7;
}

.div1{
 display: flex;
 flex:1;
 align-items: center;
 justify-content: space-between;
}

.div1>a{
flex:1;
  display: flex;
  justify-content: center;
  gap:10px;
  align-items: center;
  text-decoration: none;
  font-size: 16px; 
  position: relative;
  color:#4e80b7;
}

.div2 {
  display: flex;
  flex:2;
  justify-content: center;
  align-items: center;
  color:rgba(0, 52, 121, 1);
  font-size: 30px;
}

.div3 {
  display: flex;
 flex:1;
 align-items: center;
 justify-content: center;
 box-sizing: border-box;
}


.div31 {
  flex:1;
  display: flex;
  justify-content: center;
  gap:10px;
  align-items: center;
}
.div32 {
  flex:1;
  display: flex;
  justify-content: center;
  gap:10px;
  align-items: center;
}
.div33 {
  display: flex;
  flex:2;
  justify-content: center;
  gap:10px;
  align-items: center;
}


#header_avatar {
height: 40px;
width: 40px;
border-radius: 50%;
object-fit: cover;
}

ul {
  list-style-type: none;
  padding:10px;
}

a {
  text-decoration: none;
}

.current_page {
  height: 2px;
  width:20px;
  background: #4e80b7;
  position: absolute;
  left: 4vw;
  top:25px;
}


#menu {
  position:absolute;
  top:60px;
  right:40px;
  width:100px;
  display: none;
  height: 110px;
  z-index: 999;
  background: #fff;
  font-size: 14px;
  border-bottom: 1px solid #e8e8e8;
  text-align: center;
  padding:0;
}

#menu a{
  border-bottom: 1px solid #e8e8e8;
  line-height: 36px;
  cursor: pointer;
  display: block;
  width:100%;
}

#userinfo {
  cursor: pointer;
}

#menu a:hover{
  background-color: #4e80b7;
  color:#fff;
  border:1px solid #fff;
}

#header_nickname {
  width:8vw;
  overflow: hidden; 
  text-overflow: ellipsis; 
  white-space:nowrap;
}