.site-header {
  position: sticky;
  top: 0;
  z-index: var(--zindex-fixed);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--md);
  height: var(--header-height);
  padding: 0 var(--gutter);
}

/* background + blur live on a pseudo element: a backdrop-filter on the header
   itself would trap the fixed mobile menu inside the header box */
.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: rgba(10, 10, 12, 0.72);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: opacity var(--duration) var(--ease);
}

/* home: header floats transparent above the hero until the user scrolls */
.site-header--overlay {
  position: fixed;
  inset: 0 0 auto;
}

.site-header--overlay::after {
  opacity: 0;
}

.site-header--overlay::before {
  content: "";
  position: absolute;
  inset: 0 0 -2rem;
  z-index: -1;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent);
  pointer-events: none;
  transition: opacity var(--duration) var(--ease);
}

.site-header--overlay.is-scrolled::after {
  opacity: 1;
}

.site-header--overlay.is-scrolled::before,
.site-header.is-open::before,
.site-header.is-open::after {
  opacity: 0;
}

.logo {
  grid-column: 2;
  grid-row: 1;
  justify-self: center;
}

.logo img {
  height: 2.5rem;
  width: auto;
}

.header-content {
  display: contents;
}

.social-nav {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--xs);
}

.social-nav a {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  opacity: 0.7;
  transition: opacity var(--duration) var(--ease),
    transform var(--duration) var(--ease);
}

.social-nav a:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.icon {
  width: 1.375rem;
  height: 1.375rem;
  object-fit: contain;
  filter: invert(1);
  user-select: none;
}

#Instagram-icon,
#AmazonMusic-icon {
  filter: none;
  background-color: var(--light);
  border-radius: 50%;
  padding: 0.1rem;
}

.site-nav {
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--md);
}

.nav-links a {
  position: relative;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--muted);
  padding: var(--xxs) 0;
  transition: color var(--duration) var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration) var(--ease);
}

.nav-links a:hover,
.nav-links a[aria-current] {
  color: var(--light);
}

.nav-links a:hover::after,
.nav-links a[aria-current]::after {
  transform: scaleX(1);
}

.burger {
  display: none;
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.6rem;
  z-index: var(--zindex-popover);
}

.burger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--light);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease),
    opacity var(--duration) var(--ease);
}

.burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media screen and (max-width: 1100px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .logo {
    grid-column: 1;
    justify-self: start;
    position: relative;
    z-index: var(--zindex-popover);
  }

  .burger {
    display: flex;
    grid-column: 2;
  }

  /* full screen mobile menu */
  .header-content {
    position: fixed;
    inset: 0;
    z-index: var(--zindex-sticky);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--xl);
    padding: var(--header-height) var(--gutter) var(--xl);
    background-color: rgba(8, 8, 10, 0.94);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease), visibility 0s linear 0.3s;
  }

  .site-header.is-open .header-content {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s var(--ease), visibility 0s;
  }

  .site-nav {
    order: -1;
  }

  .nav-links {
    flex-direction: column;
    gap: var(--md);
  }

  .nav-links a {
    font-size: 2rem;
  }

  .social-nav {
    justify-content: center;
    max-width: 20rem;
    gap: var(--sm);
  }
}