/* header style */
header {
  color: var(--main-bg);
  width: 100%;
  position: fixed;
  padding: 5px 0;
  z-index: 99;
}

header.sticky,
header.white-header {
  color: var(--text);
  background: var(--main-bg);
}

header.sticky {
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
}

header.white-header {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.header {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 50px;
  padding: 0px 20px;
  border-bottom: 1px solid var(--main-bg);
}

/* change logo after scroll */
.logo img:last-child,
.sticky .logo img:first-child,
.white-header .logo img:first-child {
  display: none;
}

.sticky .logo img:last-child,
.white-header .logo img:last-child {
  display: block;
}

nav {
  display: flex;
  gap: 20px;
}

nav a {
  position: relative;
}

nav a::before {
  content: "";
  width: 0;
  height: 3px;
  position: absolute;
  bottom: -35px;
  background-color: var(--main-color);
  transition: var(--transition);
}

nav a:hover::before {
  width: 100%;
}

a.active {
  color: var(--main-color);
}

a.active::before {
  width: 100%;
}

.sticky nav a:hover,
.white-header nav a:hover {
  color: var(--main-color);
}

/* search style */
.search-box {
  margin-right: auto;
}

.search-input {
  position: absolute;
  padding: 0 20px;
  top: 83px;
  left: 0;
  width: 100%;
  height: 0;
  display: flex;
  overflow: hidden;
  background: var(--main-bg);
  transition: var(--transition);
}

.open-search-box {
  padding: 20px;
  height: inherit;
}

.search-input input[type="text"] {
  width: 100%;
  border-color: var(--main-color);
  border-radius: 0;
}

.search-input button:last-child {
  border-radius: 0.5rem 0 0 0.5rem;
}

.search-input button:first-child {
  border-radius: 0 0.5rem 0.5rem 0;
}

header .fi {
  color: var(--main-bg);
}

.sticky .header .fi,
.white-header .header .fi {
  color: var(--text);
}

.hmb {
  cursor: pointer;
  position: relative;
  width: 25px;
  display: none;
}

/* hamburger menu icon*/
.hmb span {
  position: absolute;
  width: 30px;
  height: 4px;
  background-color: #333;
  transition: var(--transition);
}

.hmb span:first-child {
  top: -12px;
}

.hmb span:nth-child(even) {
  top: -4px;
}

.hmb span:last-child {
  top: 4px;
}

.open-hmb span:nth-child(even) {
  display: none;
}

.open-hmb span:last-child {
  top: -4px;
  transform: rotate(+45deg);
}

.open-hmb span:first-child {
  top: -4px;
  transform: rotate(-45deg);
}

/* responsive menu */
@media screen and (max-width: 900px) {
  .header {
    justify-content: space-between;
  }

  .search-box {
    margin-right: 0;
  }

  .hmb {
    display: block;
  }

  nav a::before {
    background-color: inherit;
  }

  header {
    color: var(--text);
    background: var(--main-bg);
    box-shadow: var(--box-shadow);
  }

  header .fi {
    color: var(--text);
  }

  .logo img:first-child {
    display: none;
  }

  .logo img:last-child {
    display: block;
  }

  nav {
    position: absolute;
    top: 83px;
    right: 0;
    width: 100%;
    height: 0;
    overflow: hidden;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    background-color: var(--main-bg);
    transition: var(--transition);
  }

  nav a:hover {
    color: var(--main-color);
  }

  .open-menu {
    color: var(--text);
    height: 490px;
    padding: 20px 0;
    box-shadow: var(--box-shadow);
  }
}

/* end header style */