/* ==========================================================================
   Header + Navigation
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: calc(var(--z-header) + 10);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: var(--space-4) 0;
  transition: all var(--transition-base);
  background-color: transparent;
}

.site-header--scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  padding: var(--space-2) 0;
}

.site-header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  z-index: calc(var(--z-header) + 1);
}

.site-header__logo-icon {
  width: auto;
  height: 90px;
  flex-shrink: 0;
  object-fit: contain;
  transition: height var(--transition-base);
}

.site-header--scrolled .site-header__logo-icon {
  height: 50px;
}

.site-header__logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--fw-extrabold);
  color: var(--color-white);
  line-height: 1.2;
  transition: color var(--transition-base);
}

.site-header__logo-text small {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--fw-regular);
  opacity: 0.8;
}

.site-header--scrolled .site-header__logo-text {
  color: var(--color-primary);
}

/* Desktop Navigation */
.site-header__nav {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .site-header__nav {
    display: flex;
  }
}

.site-header__nav a {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.site-header__nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width var(--transition-base);
}

.site-header__nav a:hover::after,
.site-header__nav a[aria-current="page"]::after {
  width: 100%;
}

.site-header__nav a:hover {
  color: var(--color-white);
}

.site-header__nav a[aria-current="page"] {
  color: var(--color-white);
}

.site-header--scrolled .site-header__nav a {
  color: var(--color-neutral-800);
}

.site-header--scrolled .site-header__nav a:hover,
.site-header--scrolled .site-header__nav a[aria-current="page"] {
  color: var(--color-primary);
}

/* CTA in nav */
.site-header__cta {
  margin-left: var(--space-4);
  padding-inline: var(--space-6);
}

/* Hamburger */
.site-header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: calc(var(--z-header) + 2);
  gap: 6px;
}

@media (min-width: 768px) {
  .site-header__hamburger {
    display: none;
  }
}

.site-header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.site-header--scrolled .site-header__hamburger span {
  background-color: var(--color-primary);
}

/* Hamburger → X */
.site-header__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

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

/* Mobile menu hamburger always visible over dark overlay */
.site-header__hamburger[aria-expanded="true"] span {
  background-color: var(--color-white);
}

/* Mobile Menu */
.site-header__mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-header);
  background-color: var(--color-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  padding: var(--space-8);
}

.site-header__mobile-menu.is-open {
  transform: translateX(0);
}

.site-header__mobile-menu a {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--fw-bold);
  color: var(--color-white);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-header__mobile-menu a:hover {
  color: var(--color-secondary);
}

.site-header__mobile-menu a[aria-current="page"] {
  color: var(--color-secondary);
}