/* Header layout and navigation */
.site-header {
  position: relative;
  z-index: var(--z-header);
}

.site-header__nav-wrapper {
  position: sticky;
  top: 2.5rem; /* sits just below the fixed age banner */
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  background: linear-gradient(135deg,
      rgba(255, 255, 255, 0.92),
      rgba(255, 255, 255, 0.82)
  );
  box-shadow: var(--shadow-xs);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

@media (min-width: 768px) {
  .site-header__nav-wrapper {
    top: 2.75rem;
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

/* Brand */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-gray-900);
}

.site-header__logo-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 1.25rem;
  background: conic-gradient(
    from 210deg,
    var(--color-accent-turquoise),
    var(--color-accent-blue),
    var(--color-accent-pink),
    var(--color-accent-lavender),
    var(--color-accent-yellow),
    var(--color-accent-turquoise)
  );
  box-shadow: var(--shadow-sm);
  position: relative;
}

.site-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 0%, rgba(255,255,255,0.95), transparent 65%),
              rgba(255,255,255,0.9);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
}

.site-header__brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Toggle (hamburger) */
.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background-color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
}

.site-header__toggle-bar {
  height: 2px;
  width: 1.25rem;
  border-radius: 999px;
  background: linear-gradient(90deg,
    var(--color-accent-turquoise),
    var(--color-accent-pink)
  );
  margin-left: auto;
  margin-right: auto;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Desktop nav */
.site-header__nav {
  display: none;
}

.site-header__nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0;
  margin: 0;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  font-weight: 500;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0.75rem;
  bottom: 0.2rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg,
    var(--color-accent-turquoise),
    var(--color-accent-pink)
  );
  opacity: 0;
  transform: scaleX(0.85);
  transform-origin: center;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

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

.site-header__nav-item--highlight .site-header__nav-link--cta {
  color: #ffffff;
  background-image: linear-gradient(135deg,
    var(--color-accent-turquoise),
    var(--color-accent-blue),
    var(--color-accent-pink)
  );
  box-shadow: var(--shadow-sm);
  padding-inline: 1rem;
}

.site-header__nav-item--highlight .site-header__nav-link--cta::after {
  display: none;
}

.site-header__nav-item--highlight .site-header__nav-link--cta:hover {
  box-shadow: var(--shadow-md);
}

/* Mobile menu behaviour */
@media (max-width: 767px) {
  .site-header__nav-wrapper {
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  }

  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: linear-gradient(180deg,
      rgba(255, 255, 255, 0.98),
      rgba(255, 255, 255, 0.96)
    );
    box-shadow: var(--shadow-md);
    border-bottom-left-radius: var(--radius-xl);
    border-bottom-right-radius: var(--radius-xl);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    transition: max-height var(--transition-slow), opacity var(--transition-normal), visibility var(--transition-normal);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3) var(--space-6) var(--space-4);
    gap: var(--space-2);
  }

  .site-header__nav-link {
    width: 100%;
    justify-content: flex-start;
  }

  .site-header__nav--open {
    max-height: 18rem;
    opacity: 1;
    visibility: visible;
    display: block;
  }

  .site-header__toggle--open .site-header__toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header__toggle--open .site-header__toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .site-header__toggle--open .site-header__toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* Desktop visibility */
@media (min-width: 768px) {
  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    max-height: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border-radius: 0;
    background: transparent;
  }
}