/* ==========================================================================
   UP AL — Header
   Sticky, transparent at rest, gains a soft glass surface on scroll.
   RTL-aware via CSS grid + logical justify-self.
   ========================================================================== */

.header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition:
    height var(--duration-base) var(--ease-premium),
    background-color var(--duration-base) var(--ease-premium),
    border-color var(--duration-base) var(--ease-premium),
    box-shadow var(--duration-base) var(--ease-premium);
}

.header.is-scrolled {
  height: var(--header-height-scrolled);
  background-color: var(--color-bg-elevated-alpha);
  border-bottom-color: var(--color-border-soft);
  box-shadow: var(--shadow-header-scrolled);
  backdrop-filter: blur(22px) saturate(120%);
  -webkit-backdrop-filter: blur(22px) saturate(120%);
}

.header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: var(--space-6);
  height: 100%;
}

/* ---------- Brand ---------- */

.header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  justify-self: start;
}

.header__logo-icon {
  width: 38px;
  height: auto;
  transition: opacity var(--duration-fast) var(--ease-premium);
}

.header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.header__logo-text {
  font-size: 1.0625rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-primary);
}

.header__logo-subtitle {
  font-size: var(--fs-brand-subtitle);
  font-weight: var(--fw-medium);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--color-text-muted);
}

.header__brand:hover .header__logo-icon,
.header__brand:focus-visible .header__logo-icon {
  opacity: 0.85;
}

/* ---------- Primary nav (desktop) ---------- */

.header__nav {
  justify-self: center;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 2.75rem;
}

.header__nav-link {
  position: relative;
  display: inline-block;
  padding-block: var(--space-2);
  font-size: var(--fs-nav);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-premium);
}

.header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background-color: var(--color-text-primary);
  transform: scaleX(0);
  /* Grows from the reading-start edge, matching the underline-reveal
     convention used sitewide (Why UP AL's CTA link, Contact's form
     underline) rather than a symmetric center reveal. */
  transform-origin: right center;
  transition: transform var(--duration-base) var(--ease-premium);
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
  color: var(--color-text-primary);
}

.header__nav-link:hover::after,
.header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

/* ---------- Actions ---------- */

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  justify-self: end;
}

.header__cta {
  display: inline-flex;
}

/* ---------- Menu toggle (mobile) ---------- */

.header__menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-inline-start: calc(var(--space-2) * -1);
  border-radius: var(--radius-sm);
}

.header__menu-icon,
.header__menu-icon::before,
.header__menu-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-premium), opacity var(--duration-fast) var(--ease-premium);
}

.header__menu-icon {
  position: relative;
}

.header__menu-icon::before,
.header__menu-icon::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
}

.header__menu-icon::before {
  top: -6px;
}

.header__menu-icon::after {
  top: 6px;
}

.header__menu-toggle[aria-expanded="true"] .header__menu-icon {
  background-color: transparent;
}

.header__menu-toggle[aria-expanded="true"] .header__menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.header__menu-toggle[aria-expanded="true"] .header__menu-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- Mobile menu panel ---------- */

.mobile-menu {
  position: fixed;
  inset-inline: 0;
  top: var(--header-height);
  z-index: 49;
  background-color: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) var(--container-pad) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
  transform: translateY(-8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--duration-base) var(--ease-premium),
    transform var(--duration-base) var(--ease-premium),
    top var(--duration-base) var(--ease-premium),
    visibility 0s linear var(--duration-base);
}

.header.is-scrolled .mobile-menu {
  top: var(--header-height-scrolled);
}

.mobile-menu.is-open {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
  pointer-events: auto;
  transition:
    opacity var(--duration-base) var(--ease-premium),
    transform var(--duration-base) var(--ease-premium),
    visibility 0s linear 0s;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__link {
  display: block;
  padding-block: var(--space-3);
  font-size: 1.375rem;
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--duration-fast) var(--ease-premium);
}

.mobile-menu__link:hover,
.mobile-menu__link:focus-visible {
  color: var(--color-accent);
}

.mobile-menu__cta {
  align-self: stretch;
  justify-content: center;
}

/* ---------- Breakpoint: collapse to mobile nav ---------- */

@media (max-width: 900px) {
  .header__nav {
    display: none;
  }

  .header__cta {
    display: none;
  }

  .header__menu-toggle {
    display: inline-flex;
  }
}

@media (min-width: 901px) {
  .mobile-menu {
    display: none;
  }
}

body.menu-open {
  overflow: hidden;
}