/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(to bottom, rgba(5, 7, 22, 0.96), rgba(5, 7, 22, 0.9));
  border-bottom: 1px solid rgba(134, 143, 255, 0.4);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.25rem;
  gap: var(--space-8);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: -3rem;
  padding: var(--space-4) var(--space-8);
  background: #050716;
  color: var(--color-accent-cyan);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 242, 255, 0.75);
  font-size: var(--font-size-sm);
  z-index: 50;
}

.skip-link:focus-visible {
  top: var(--space-4);
}

/* Brand */
.header-brand {
  flex: 0 0 auto;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 40%;
  background: radial-gradient(circle at 30% 20%, var(--color-accent-cyan) 0%, transparent 55%),
    radial-gradient(circle at 70% 80%, var(--color-accent-orange) 0%, transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(90, 75, 255, 0.9) 0%, rgba(5, 7, 22, 1) 70%);
  box-shadow: var(--shadow-glow-cyan);
}

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

.brand-title {
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-soft);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Navigation */
.primary-nav {
  flex: 1;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-4);
  padding-block: var(--space-2);
  font-size: var(--font-size-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 20%;
  right: 20%;
  bottom: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-accent-cyan), var(--color-accent-orange));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-normal);
}

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

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

.nav-item--cta .nav-link--cta {
  border-radius: var(--radius-pill);
  padding-inline: var(--space-6);
  padding-block: var(--space-2);
  background: radial-gradient(circle at 0% 0%, rgba(255, 214, 74, 0.36) 0%, transparent 55%), var(--gradient-primary);
  color: #050716;
  box-shadow: var(--shadow-soft);
}

.nav-item--cta .nav-link--cta::after {
  display: none;
}

.nav-item--cta .nav-link--cta:hover,
.nav-item--cta .nav-link--cta:focus-visible {
  box-shadow: var(--shadow-glow-cyan);
  color: #050716;
}

/* Mobile toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(134, 143, 255, 0.6);
  color: var(--color-text);
  cursor: pointer;
  background: rgba(5, 7, 22, 0.9);
}

.nav-toggle-box {
  position: relative;
  width: 20px;
  height: 16px;
}

.nav-toggle-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--color-accent-cyan);
  transition: transform var(--transition-fast), opacity var(--transition-fast), top var(--transition-fast), bottom var(--transition-fast);
}

.nav-toggle-line--top {
  top: 0;
}

.nav-toggle-line--middle {
  top: 7px;
}

.nav-toggle-line--bottom {
  bottom: 0;
}

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

/* Toggle active state */
.site-header--nav-open .nav-toggle-line--top {
  top: 7px;
  transform: rotate(45deg);
}

.site-header--nav-open .nav-toggle-line--middle {
  opacity: 0;
}

.site-header--nav-open .nav-toggle-line--bottom {
  bottom: 7px;
  transform: rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 946px) {
  .primary-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at 0% 0%, rgba(30, 242, 255, 0.1) 0%, transparent 55%), rgba(5, 7, 22, 0.98);
    border-bottom: 1px solid rgba(134, 143, 255, 0.4);
    transform-origin: top;
    transform: scaleY(0.8);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .site-header--nav-open .primary-nav {
    opacity: 1;
    transform: scaleY(1);
    pointer-events: auto;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-8);
    gap: var(--space-4);
  }

  .nav-link {
    width: 100%;
    padding-inline: 0;
  }

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

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

@media (min-width: 946px) {
  .nav-toggle {
    display: none;
  }
}