/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(120deg, rgba(5, 8, 20, 0.94), rgba(11, 16, 34, 0.96));
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-4);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -200%);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #020617;
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 50;
  transition: transform var(--transition-fast) var(--easing-soft);
}

.skip-link:focus-visible {
  transform: translate(-50%, 0.5rem);
}

/* Brand */
.header-brand-wrap {
  display: flex;
  align-items: center;
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  position: relative;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 0.9rem;
  background: radial-gradient(circle at 20% 0%, rgba(59, 130, 246, 0.7), transparent 55%),
              radial-gradient(circle at 80% 100%, rgba(236, 72, 153, 0.8), transparent 55%),
              #020617;
  box-shadow: var(--shadow-neon-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.brand-dot {
  position: absolute;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: var(--radius-full);
}

.brand-dot--blue {
  top: 0.35rem;
  left: 0.4rem;
  background: #3b82f6;
}

.brand-dot--purple {
  bottom: 0.35rem;
  right: 0.4rem;
  background: #ec4899;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
}

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

/* Nav */
.primary-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-100);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--gray-50);
}

.nav-item--cta .nav-link-cta {
  padding-inline: 1.25rem;
  padding-block: 0.55rem;
}

/* Mobile toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.6);
  color: var(--gray-100);
  background: rgba(15, 23, 42, 0.8);
  cursor: pointer;
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.nav-toggle-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #e5e7eb;
  transition: transform var(--transition-base) var(--easing-soft),
    opacity var(--transition-base) var(--easing-soft);
}

.nav-toggle-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

/* Toggle open (controlled via JS) */
.site-header.menu-open .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header.menu-open .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header.menu-open .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 767.98px) {
  .primary-nav {
    position: fixed;
    inset-inline: 0;
    top: var(--header-height);
    background: rgba(5, 8, 20, 0.98);
    backdrop-filter: blur(20px);
    max-height: 0;
    overflow: hidden;
    border-bottom: 1px solid rgba(148, 163, 184, 0.3);
    transition: max-height var(--transition-base) var(--easing-soft);
  }

  .site-header.menu-open .primary-nav {
    max-height: 18rem;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
  }

  .nav-item--cta {
    width: 100%;
  }

  .nav-item--cta .nav-link-cta {
    width: 100%;
    justify-content: center;
  }
}

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

@media (max-width: 479.98px) {
  .brand-tagline {
    display: none;
  }
}