.header {
  position: relative;
  width: 100%;
}

.header::after {
  content: '';
  height: 100%;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
}

.header,
.header::after {
  height: 80px;
}

.header::after,
.header-nav {
  background-color: white;
}

.header-nav {
  max-width: 1300px;
  margin: 0 auto;
}

/* 返回图标 */
.back-icon {
  display: block;
  width: 12px;
  height: 12px;
  border-style: solid;
  border-color: var(--color-text-primary);
  border-width: 0 0 2px 2px;
  transform: rotate(45deg);
  margin-left: 8px;
}

.header-nav .icon-bar {
  background-color: var(--color-text-primary);
}

.header-nav .navbar-brand {
  padding-top: 20px;
  position: relative;
}

.header-nav .navbar-brand::before {
  content: '';
  position: absolute;
  z-index: -1;
  right: -50px;
  top: 0;
  width: 1000px;
  height: 80px;
  /* background: linear-gradient(-55deg, transparent 80px, var(--color-primary) 0); */
}

.header-nav .logo {
  height: 41px;
  width: auto;
  margin-right: 40px;
}

.header-nav .active {
  position: relative;
}

.header-nav .active a {
  color: var(--color-primary);
}

.header-nav .nav > li > a {
  line-height: 48px;
}

.header-nav .nav > li > a:hover {
  background: none;
}

.header-nav .active::after {
  position: absolute;
  bottom: 12px;
  left: 50%;
  margin-left: -15px;
  z-index: 1;
  content: '';
  width: 32px;
  height: 4px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.left-box {
  position: absolute;
  top: 0;
  right: 0;
  white-space: nowrap;
  /* height: 100%; */
}

.header-nav .answers-search {
  padding-top: 15px;
  padding-bottom: 15px;
}

.header-nav .answers-btn {
  display: inline;
  line-height: 48px;
  padding-top: 0;
  padding-bottom: 0;
}

.header-nav .search-block {
  position: relative;
}

.header-nav .search-btn {
  border: none;
  outline: none;
  background: none;
  padding: 0;
  margin: 0;
}

.header-nav .search-icon {
  position: absolute;
  right: 15px;
  top: 10px;
  width: 26px;
  height: 26px;
}

.header-nav .search-input {
  float: left;
  height: 48px;
  display: inline;
  margin-left: 10px;
  border-radius: 48px;
  padding-right: 40px;
  background-color: var(--background-primary);
}

.header-nav .search-input:focus {
  border-color: #fcb91ebd;
  box-shadow:
    inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px #fcb91e5c;
}

.header-nav .mine-name {
  width: 80px;
}

.header-nav .mine-photo {
  width: 45px;
  height: 45px;
  min-width: 45px;
}

/************************************ 小屏幕(phone端) ********************/
@media screen and (max-width: 767px) {
  .header,
  .header::after {
    height: 50px;
  }

  .navbar-brand {
    display: none !important;
  }

  .header-nav .active::after {
    display: none;
  }

  .navbar-toggle {
    float: left !important;
  }

  .header-nav .answers-search {
    padding-top: 0;
    padding-bottom: 0;
  }

  .answers-search .answers-btn,
  .answers-search .search-input {
    float: right;
    height: 30px;
    line-height: 30px;
  }

  .answers-search .answers-btn {
    order: 2;
    margin-left: 10px;
  }

  .answers-search .answers-btn span:nth-child(1) {
    display: none;
  }

  .answers-search .search-input {
    width: 300px;
  }

  .header-nav .search-icon {
    right: 10px;
    top: 5px;
    width: 20px;
    height: 20px;
  }

  .header-nav .mine-photo {
    width: 35px;
    height: 35px;
    min-width: 35px;
  }

  .left-box {
    top: 7px;
    margin-top: 3px;
    padding-right: 10px;
  }
}

@media screen and (max-width: 500px) {
  .answers-search .search-input {
    width: 240px;
  }
}

@media screen and (max-width: 420px) {
  .answers-search .search-input {
    width: 230px;
  }
}

@media screen and (max-width: 400px) {
  .answers-search .search-input {
    width: 200px;
  }
}

@media screen and (max-width: 380px) {
  .answers-search .search-input {
    width: 180px;
  }
}

@media screen and (max-width: 350px) {
  .answers-search .search-input {
    width: 140px;
  }
}

/************************************ 大屏幕(web端) ********************/
@media (min-width: 768px) {
  .header-nav .nav > li > a {
    padding-left: 5px;
    padding-right: 5px;
  }

  .header-nav .answers-btn {
    width: 80px;
    margin-right: 10px;
  }

  .header-nav .search-input {
    width: 100px;
    margin-right: 5px;
  }

  .header-nav .mine-name {
    width: 70px;
  }
}

@media (min-width: 1150px) {
  .header-nav .nav > li > a {
    padding-left: 24px;
    padding-right: 24px;
  }

  .header-nav .answers-btn {
    width: 110px;
  }

  .header-nav .search-input {
    width: 120px;
  }
}

@media (min-width: 1350px) {
  .header-nav .nav > li > a {
    padding-left: 26px;
    padding-right: 26px;
  }

  .header-nav .answers-btn {
    width: 120px;
  }
}