/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  padding-block: clamp(1.25rem, 2.5vw, 1.75rem);
  background: var(--noir);
  border-bottom: 1px solid transparent;
  transition: padding var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-header.is-scrolled {
  padding-block: 0.85rem;
  border-bottom-color: var(--line-dark);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand img {
  display: block;
  height: 4.5rem;
  width: auto;
}

@media (max-width: 860px) {
  .brand img {
    height: 3.25rem;
  }
}

@media (max-width: 480px) {
  .brand img {
    height: 2.5rem;
  }
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 2.5vw, 2.5rem);
}

.main-nav__list {
  display: flex;
  gap: clamp(1.5rem, 2.5vw, 2.5rem);
}

.main-nav__list a {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--cream);
  padding-block: 0.3em;
}

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

.main-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--luz);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-fast) var(--ease-out);
}

.main-nav__list a:hover::after,
.main-nav__list a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-cta {
  font-size: 0.875rem;
  padding: 0.7em 1.4em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 26px;
  padding: 0.5rem;
  margin: -0.5rem;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--cream);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 860px) {
  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: var(--noir);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: var(--gutter);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--dur-med) var(--ease-in-out), opacity var(--dur-med) var(--ease-in-out);
    visibility: hidden;
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .main-nav__list {
    flex-direction: column;
    gap: 1.75rem;
  }

  .main-nav__list a {
    font-size: 1.75rem;
    font-family: var(--font-display);
    font-weight: 500;
  }

  .main-nav .btn {
    margin-top: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .main-nav {
    transition: none;
  }
}