header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  left: 0;
  z-index: 99;
  width: 100%;
  height: 70px;
  padding: 0px 10px;
  background: var(--white);
  color: var(--black);
}
.logo {
  height: 100%;
}
.logo img {
  width: 170px;
  height: 100%;
  object-fit: contain;
}
.navigation {
  display: flex;
  gap: 20px;
  font-size: 19px;
  transition: 0.3s ease-out;
}
.navigation .nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  padding: 8px 16px;
  color: var(--gray);
  cursor: pointer;
  transition: 0.2s linear;
}
.navigation .nav-item:hover {
  color: var(--black);
}
/* mobile btn */
.menu-btn {
  position: relative;
  display: none;
  justify-content: end;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
}
.menu-btn .line {
  position: absolute;
  width: 100%;
  height: 4px;
  background: black;
  border-radius: 10px;
  transition: 0.3s linear;
}
.menu-btn .line:nth-child(1) {
  margin-top: -10px;
}
.menu-btn .line:nth-child(2) {
  margin-top: 10px;
  width: 50%;
}
/* mobile & tablet*/
@media (max-width: 600px) {
  .menu-btn {
    display: flex;
  }
  .navigation {
    flex-direction: column;
    position: fixed;
    gap: 10px;
    top: 70px;
    left: 0;
    width: 100%;
    height: 100vh;
    padding: 10px;
    background: var(--white);
    opacity: 0;
    visibility: hidden;
  }
}