/* 动态导航下拉菜单：桌面端悬停/键盘访问，手机端点按展开 */
.site-nav .nav-dropdown {
  position: relative;
  display: flex;
  align-self: stretch;
  align-items: stretch;
}

.site-nav .nav-dropdown-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding: 0 14px 0 0;
  color: inherit;
  white-space: nowrap;
  transition: color .18s ease;
}

.site-nav .nav-dropdown-toggle::before {
  position: absolute;
  top: 50%;
  right: 1px;
  width: 5px;
  height: 5px;
  margin-top: -4px;
  content: "";
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  transition: transform .18s ease;
}

.site-nav .nav-dropdown-toggle::after {
  position: absolute;
  right: 0;
  bottom: 22px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--orange);
  transform: scaleX(0);
  transition: transform .18s ease;
}

.site-nav .nav-dropdown:hover .nav-dropdown-toggle,
.site-nav .nav-dropdown:focus-within .nav-dropdown-toggle,
.site-nav .nav-dropdown.active .nav-dropdown-toggle {
  color: var(--orange-deep);
}

.site-nav .nav-dropdown:hover .nav-dropdown-toggle::after,
.site-nav .nav-dropdown:focus-within .nav-dropdown-toggle::after,
.site-nav .nav-dropdown.active .nav-dropdown-toggle::after {
  transform: scaleX(1);
}

.site-nav .nav-dropdown-menu {
  position: absolute;
  z-index: 40;
  top: 64px;
  left: 50%;
  display: grid;
  width: max-content;
  min-width: 208px;
  max-width: min(320px,calc(100vw - 36px));
  max-height: min(52vh,420px);
  padding: 9px;
  overflow-y: auto;
  border: 1px solid rgba(231,233,237,.98);
  border-radius: 3px;
  color: var(--body);
  background: rgba(255,255,255,.98);
  box-shadow: 0 18px 42px rgba(24,35,49,.14);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%,-7px);
  visibility: hidden;
  transition: opacity .18s ease,transform .18s ease,visibility .18s ease;
}

.site-nav .nav-dropdown-menu::before {
  position: absolute;
  top: -5px;
  left: 50%;
  width: 9px;
  height: 9px;
  content: "";
  border-top: 1px solid rgba(231,233,237,.98);
  border-left: 1px solid rgba(231,233,237,.98);
  background: #fff;
  transform: translateX(-50%) rotate(45deg);
}

.site-nav .nav-dropdown-menu a,
.site-nav .nav-dropdown-empty {
  position: relative;
  display: block;
  padding: 10px 13px;
  border-radius: 2px;
  color: inherit;
  font-size: 13px;
  line-height: 1.45;
  transition: color .16s ease,background .16s ease;
}

.site-nav .nav-dropdown-menu a:hover,
.site-nav .nav-dropdown-menu a:focus-visible {
  color: var(--orange-deep);
  background: var(--orange-soft);
  outline: none;
}

.site-nav .nav-dropdown-menu .nav-dropdown-all {
  padding-top: 9px;
  padding-bottom: 10px;
  color: var(--orange-deep);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  font-weight: 600;
}

.site-nav .nav-dropdown-empty {
  color: #8b949d;
  font-size: 12px;
}

@media (min-width:881px) {
  .site-nav .nav-dropdown:hover .nav-dropdown-menu,
  .site-nav .nav-dropdown:focus-within .nav-dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%,0);
    visibility: visible;
  }

  .site-nav .nav-dropdown:focus-within .nav-dropdown-toggle::before {
    transform: rotate(225deg) translate(-1px,-1px);
  }
}

@media (max-width:880px) {
  .site-nav .nav-dropdown {
    display: block;
    align-self: auto;
  }

  .site-nav .nav-dropdown-toggle {
    display: flex;
    height: auto;
    min-height: 45px;
    padding: 13px 24px 13px 0;
    align-items: center;
  }

  .site-nav .nav-dropdown-toggle::before {
    right: 7px;
  }

  .site-nav .nav-dropdown-toggle::after {
    display: none;
  }

  .site-nav .nav-dropdown-menu {
    position: static;
    display: grid;
    width: auto;
    min-width: 0;
    max-width: none;
    max-height: 0;
    margin: 0;
    padding: 0 8px;
    overflow: hidden;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    pointer-events: none;
    transform: none;
    visibility: visible;
    transition: max-height .24s ease,padding .2s ease,border-color .2s ease;
  }

  .site-nav .nav-dropdown-menu::before {
    display: none;
  }

  .site-nav .nav-dropdown.open .nav-dropdown-menu {
    max-height: min(52vh,420px);
    padding: 3px 8px 11px;
    border-left-color: var(--orange);
    pointer-events: auto;
  }

  .site-nav .nav-dropdown.open .nav-dropdown-toggle::before {
    margin-top: -1px;
    transform: rotate(225deg);
  }

  .site-nav .nav-dropdown-menu a,
  .site-nav .nav-dropdown-empty {
    padding: 9px 11px;
  }

  .site-nav .nav-dropdown-menu .nav-dropdown-all {
    padding-top: 8px;
  }
}

@media (max-width:620px) {
  .site-nav .nav-dropdown-menu {
    max-height: 0;
  }
}