header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  /* because leaflet top z-index is 1000 */
  z-index: 1001;
  transition: background-color .25s;
}

header.scrolled {
  background: #fff;
}

header a.logo {
  background-repeat: no-repeat;
  background-position: left center;
  background-size: 188px auto;
}

header.scrolled .menu {
  color: #333;
}

header:not(.scrolled) .menu {
  color: #fff;
}

header nav {
  display: flex;
  align-items: center;
  max-width: 1580px;
  margin: 0 auto;
  padding: 11px max(20px, 4%);
}

header a.logo {
  min-width: 188px;
  width: 188px;
  height: 60px;
  padding-right: 20px;
}

header .menu {
  height: 60px;
  margin-left: 10px;
  padding: 0 15px;
  line-height: 60px;
  text-decoration: none;
}

header .trigger {
  position: relative;
  cursor: pointer;
}

header .trigger span {
  border-bottom: 1px solid transparent;
}

header .trigger:hover span {
  border-bottom-color: currentColor;
}

header .triangle {
  position: absolute;
  top: 53px;
  left: calc(50% - 8px);
  width: 0;
  height: 0;
  z-index: 1;
  transform: translate3d(0px, -30px, 0px);
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-bottom: 8px solid #e6e6e6;
  visibility: hidden;
  opacity: 0;
  transition: .25s;
}

header .triangle::after {
  content: '';
  position: absolute;
  top: 1px;
  left: -7px;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 7px solid #fff;
}

header .dropdown {
  position: absolute;
  top: 60px;
  left: 0;
  min-width: 120px;
  padding: 10px;
  white-space: nowrap;
  border-radius: 5px;
  border: 1px solid #e6e6e6;
  box-shadow: 0 2px 12px 0 rgb(0 0 0 / 10%);
  background: #fff;
  visibility: hidden;
  opacity: 0;
  transition: .25s;
  transform: translate3d(0px, -30px, 0px);
}

header .sub-menu {
  display: block;
  padding: 10px;
  line-height: 1.5;
  text-decoration: none;
  color: #333;
}

header .trigger:hover .triangle,
header .trigger:hover .dropdown {
  visibility: visible;
  opacity: 1;
  transform: translate3d(0px, 0px, 0px);
}

header nav form {
  display: flex;
  align-items: center;
  box-sizing: border-box;
  width: 220px;
  height: 40px;
  margin-left: auto;
  padding: 0 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  border: 1px solid transparent;
}

header nav form .icon-search {
  font-size: 22px;
  font-weight: 500;
  color: #fff;
}

header nav form input {
  width: 0;
  flex: 1;
  height: 36px;
  font-size: 18px;
  line-height: 34px;
  margin-left: 10px;
  padding: 0;
  color: #fff;
  background: transparent;
  outline: none;
  border: 1px solid transparent;
}

header nav form input::placeholder {
  color: #fff;
}

header.scrolled nav form {
  border-color: #e6e6e6;
}

header.scrolled nav form .icon-search,
header.scrolled nav form input,
header.scrolled nav form input::placeholder {
  color: #333;
}