/* Header-specific styles building on base.css */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: 0.25rem 0;
}

.site-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 30% 20%, #fdfbff, transparent 55%),
    linear-gradient(135deg, var(--color-primary-strong), var(--color-primary));
  box-shadow: var(--shadow-soft);
}

.site-header__logo-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

/* Navigation layout */
.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-24);
}

.site-header__nav-item--highlight .site-header__nav-link--cta {
  padding-inline: 0.75rem;
  padding-block: 0.35rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(143, 107, 255, 0.3);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 24px rgba(15, 9, 54, 0.08);
}

.site-header__nav-item--highlight .site-header__nav-link--cta:hover {
  background: rgba(255, 255, 255, 1);
  border-color: rgba(143, 107, 255, 0.6);
}

/* Mobile toggle button */
.site-header__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(143, 107, 255, 0.3);
  background-color: rgba(255, 255, 255, 0.85);
  padding: 0;
  justify-content: center;
  align-items: center;
}

.site-header__toggle-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base), background-color var(--transition-base);
}

.site-header__toggle-line + .site-header__toggle-line {
  margin-top: 4px;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 767.98px) {
  .site-header__toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .site-header__nav {
    position: fixed;
    inset-inline: 0;
    top: var(--nav-height);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    background: rgba(248, 247, 251, 0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(143, 107, 255, 0.18);
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-16);
    padding: var(--space-24) var(--space-16) var(--space-32);
  }

  .site-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

@media (min-width: 768px) {
  .site-header__nav {
    position: static;
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
  }
}

/* Helper class to lock body scroll when mobile nav is open */
.body--nav-open {
  overflow: hidden;
}