/* =======================================================
   HEADER
======================================================= */

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: var(--z-header);

  background: linear-gradient(
    180deg,
    rgb(8 29 63 / 64%) 0%,
    rgb(8 29 63 / 18%) 100%
  );
}

.site-header__container {
  display: flex;
  align-items: center;

  min-height: 5.5rem;
}

/* =======================================================
   BRAND
======================================================= */

.site-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;

  color: var(--color-on-dark);
}

.site-brand__title {
  display: flex;
  align-items: center;

  margin-bottom: var(--space-1);

  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
}

.site-brand__title-primary {
  color: var(--color-on-dark);
}

.site-brand__title-accent {
  color: var(--color-accent);
}

.site-brand__subtitle {
  color: var(--color-on-dark-muted);

  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
}

/* =======================================================
   PRIMARY NAVIGATION
======================================================= */

.primary-navigation {
  margin-left: auto;
}

.primary-navigation__list {
  display: flex;
  align-items: center;
  gap: 3.5rem;
}

.primary-navigation__list a {
  position: relative;

  color: var(--color-on-dark-muted);

  font-size: 1rem;
  font-weight: 600;

  transition: color var(--transition-medium);
}

.primary-navigation__list a::after {
  position: absolute;
  bottom: -0.5rem;
  left: 0;

  width: 0;
  height: 2px;

  background-color: var(--color-accent);

  content: "";

  transition: width var(--transition-medium);
}

.primary-navigation__list a:focus-visible,
.primary-navigation__list a.is-active {
  color: var(--color-on-dark);
}

.primary-navigation__list a:focus-visible::after,
.primary-navigation__list a.is-active::after {
  width: 100%;
}

@media (hover: hover) and (pointer: fine) {
  .primary-navigation__list a:hover {
    color: var(--color-on-dark);
  }

  .primary-navigation__list a:hover::after {
    width: 100%;
  }
}

/* =======================================================
   NAVIGATION TOGGLE
======================================================= */

.navigation-toggle {
  display: none;

  width: 3rem;
  height: 3rem;
  padding: 0.65rem;

  border: 1px solid rgb(255 255 255 / 18%);
  border-radius: var(--radius-small);

  color: var(--color-on-dark);
  background-color: rgb(255 255 255 / 6%);

  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.navigation-toggle__line {
  display: block;

  width: 100%;
  height: 2px;
  margin-block: 0.3rem;

  background-color: currentColor;

  transition:
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.navigation-toggle:focus-visible {
  outline: 3px solid var(--color-accent-light);
  outline-offset: 3px;
}

.navigation-toggle[aria-expanded="true"] .navigation-toggle__line:nth-child(1) {
  transform: translateY(0.6rem) rotate(45deg);
}

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

.navigation-toggle[aria-expanded="true"] .navigation-toggle__line:nth-child(3) {
  transform: translateY(-0.6rem) rotate(-45deg);
}

@media (hover: hover) and (pointer: fine) {
  .navigation-toggle:hover {
    border-color: rgb(255 255 255 / 36%);
    background-color: rgb(255 255 255 / 10%);
  }
}

/* =======================================================
   TABLET AND MOBILE
======================================================= */

@media (max-width: 75rem) {
  .primary-navigation__list {
    gap: 2rem;
  }

  .site-brand__title {
    font-size: 2.15rem;
  }
}

@media (max-width: 60rem) {
  .site-header {
    position: relative;

    background: linear-gradient(
      180deg,
      rgb(8 29 63 / 96%) 0%,
      rgb(8 29 63 / 92%) 100%
    );
  }

  .site-brand__title {
    font-size: 2rem;
  }

  .navigation-toggle {
    display: block;
    flex-shrink: 0;

    margin-left: auto;
  }

  .primary-navigation {
    position: absolute;
    z-index: var(--z-menu);
    top: 100%;
    right: 0;
    left: 0;

    display: none;

    width: 100%;
    margin-left: 0;
    padding-block: var(--space-3) var(--space-5);

    border-top: 1px solid rgb(255 255 255 / 10%);

    background-color: rgb(8 29 63 / 99%);
    box-shadow: var(--shadow-medium);
  }

  .primary-navigation.is-open {
    display: block;
  }

  .primary-navigation__list {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
  }

  .primary-navigation__list li {
    border-bottom: 1px solid rgb(255 255 255 / 8%);
  }

  .primary-navigation__list li:last-child {
    border-bottom: 0;
  }

  .primary-navigation__list a {
    display: block;

    width: 100%;
    padding-block: var(--space-4);

    color: var(--color-on-dark-muted);

    font-size: 1rem;
    font-weight: 600;
  }

  .primary-navigation__list a:focus-visible,
  .primary-navigation__list a.is-active {
    color: var(--color-on-dark);
  }

  .primary-navigation__list a::after {
    display: none;
  }
}

/* =======================================================
   SMALL MOBILE
======================================================= */

@media (max-width: 30rem) {
  .site-header__container {
    min-height: 5rem;
  }

  .site-brand__title {
    font-size: 1.75rem;
  }

  .site-brand__subtitle {
    font-size: 0.55rem;
    letter-spacing: 0.22em;
  }

  .navigation-toggle {
    width: 2.75rem;
    height: 2.75rem;
    padding: 0.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .primary-navigation__list a,
  .primary-navigation__list a::after,
  .navigation-toggle,
  .navigation-toggle__line {
    transition: none;
  }
}