header {
  background: #06402b;
  display: grid;
  grid-template-rows: 4rem;
  position: sticky;
  top: 0;

  @media(min-width: 768px) {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #f9f7f2;
  }

  nav {
    a {
      color: #f9f7f2;
      text-decoration: none;
      position: relative;
      padding-bottom: 2px;
    }

    a::after {
      content: '';
      position: absolute;
      width: 100%;
      height: 2px;
      bottom: 0;
      left: 0;
      background-color: #f9f7f2;
      transform: scaleX(0);
      transform-origin: bottom right;
      transition: transform 0.2s ease-out;
    }

    a:hover::after {
      transform: scaleX(1);
      transform-origin: bottom left;
    }

    &:not(.nav-links) {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #f9f7f2;
      padding: 1rem;
      z-index: 1;
      background: #06402b;

      @media(min-width: 768px) {
        border-bottom: none;
      }

      .hamburger {
        width: 30px;
        height: 24px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        cursor: pointer;

        @media (min-width: 768px) {
          display: none;
        }

        .line {
          width: 30px;
          height: 3px;
          background: #f9f7f2;
          transition: transform 0.2s ease-in-out;
        }

        &.open {
          .line--top {
            transform: translateY(10.5px) rotate(45deg);
          }

          .line--middle {
            opacity: 0;
            transform: translateX(-20px);
          }

          .line--bottom {
            transform: translateY(-10.5px) rotate(-45deg);
          }
        }
      }
    }

    &.nav-links {
      position: absolute;
      top: -100vh;
      height: calc(100svh - 4rem);
      background: #06402b;
      width: 100%;
      padding: 1rem;
      transition: top 0.3s ease-in-out, right 0.3s ease-in-out;

      @media(min-width: 768px) {
        position: static;
        height: auto;
        width: auto;
      }

      ul {
        list-style: none;
        display: grid;
        gap: 1rem;

        @media(min-width: 768px) {
          display: flex;
        }
      }

      &.open {
        top: 4rem;
        height: calc(100svh - 4rem);
      }
    }
  }

  &.open {
    display: grid;
    grid-template-rows: 4rem 1fr;

    .nav-links {
      height: min-content;
      opacity: 1;
    }
  }
}