.site-header {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 100;
  padding: 30px 8vw;
}

.site-header nav {
  display: flex;
  gap: 40px;
  align-items: center;
}

.site-nav {
  display: flex;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(17, 17, 17, .25);
  color: #111;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  margin: auto;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}

.menu-toggle span {
  position: relative;
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
}

.menu-toggle span::before {
  transform: translateY(-6px);
}

.menu-toggle span::after {
  transform: translateY(6px);
}

.site-header.is-menu-open .menu-toggle span {
  background: transparent;
}

.site-header.is-menu-open .menu-toggle span::before {
  transform: rotate(45deg);
}

.site-header.is-menu-open .menu-toggle span::after {
  transform: rotate(-45deg);
}

.site-header nav a {
  color: #111;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0;
  text-decoration: none;
  transition: color .2s ease;
}

.site-header nav a:hover,
.site-header nav a.active {
  color: #4f46e5;
}

.project-detail-page .site-header {
  color: #fff;
}

.project-detail-page .site-header nav a,
.project-detail-page .menu-toggle {
  color: #fff;
}

.project-detail-page .menu-toggle {
  border-color: rgba(255, 255, 255, .35);
}

@media (max-width: 900px) {
  .site-header {
    justify-content: flex-end;
    padding: 20px clamp(20px, 5vw, 40px);
  }

  .site-header nav {
    display: none;
    position: absolute;
    top: calc(100% - 4px);
    right: clamp(20px, 5vw, 40px);
    left: clamp(20px, 5vw, 40px);
    z-index: 110;
    flex-direction: column;
    gap: 0;
    padding: 8px;
    background: #fff;
    box-shadow: 0 18px 40px rgba(17, 17, 17, .14);
  }

  .site-header.is-menu-open nav {
    display: flex;
  }

  .site-header nav a {
    display: block;
    padding: 15px 12px;
    font-size: 14px;
  }

  .project-detail-page .site-header nav {
    background: #111;
    box-shadow: 0 18px 40px rgba(0, 0, 0, .38);
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .menu-toggle:focus-visible,
  .site-header nav a:focus-visible {
    outline: 2px solid #4f46e5;
    outline-offset: 3px;
  }
}