/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(to bottom, rgba(5, 5, 9, 0.96), rgba(5, 5, 9, 0.88));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.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);
}

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

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

.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.9rem;
  background: radial-gradient(circle at 30% 0, #ff4b5b 0, #e63946 45%, #7f1d1f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  box-shadow: var(--shadow-glow-primary);
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Navigation */
.site-nav {
  margin-left: auto;
}

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

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.nav-cta-btn {
  padding-inline: 1.4rem;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(15, 23, 42, 0.9);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bar {
  position: absolute;
  width: 1.2rem;
  height: 2px;
  background: var(--color-text);
  border-radius: 999px;
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.nav-toggle-bar:nth-child(1) {
  top: 0.85rem;
}

.nav-toggle-bar:nth-child(2) {
  top: 1.2rem;
}

.nav-toggle-bar:nth-child(3) {
  bottom: 0.85rem;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  top: 1.2rem;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  bottom: 1.2rem;
  transform: rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 768px) {
  .header-inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset-inline: 0;
    top: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    background: radial-gradient(circle at top, rgba(0, 0, 0, 0.96), #050509 70%);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-16) var(--space-4) var(--space-8);
    gap: var(--space-3);
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 0.75rem 0.25rem;
    font-size: 0.95rem;
  }

  .nav-cta {
    margin-top: var(--space-2);
  }

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

@media (max-width: 480px) {
  .brand-tagline {
    display: none;
  }
}