/* Header styles for PC Service Hub */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.9));
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(30, 64, 175, 0.65);
}

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

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

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

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 30%;
  background: radial-gradient(circle at 30% 0, rgba(248, 250, 252, 0.6) 0, transparent 40%),
    radial-gradient(circle at bottom, rgba(56, 189, 248, 0.35) 0, transparent 55%),
    linear-gradient(135deg, #1d4ed8, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.brand-icon {
  font-size: 1.1rem;
  color: #e5e7eb;
}

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

.brand-name {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.03em;
}

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

/* Navigation */

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

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

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: 0.4rem 0.1rem;
  border-bottom: 2px solid transparent;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.nav-link:hover {
  color: var(--gray-50);
  border-bottom-color: rgba(59, 130, 246, 0.75);
}

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

.header-cta {
  padding-inline: 1.1rem;
}

/* Mobile navigation toggle */

.nav-toggle {
  position: relative;
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at top left, rgba(148, 163, 184, 0.5) 0, transparent 40%),
    rgba(15, 23, 42, 0.96);
  padding: 0;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bar {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: #e5e7eb;
  transition: transform var(--transition-fast), opacity var(--transition-fast), top var(--transition-fast), bottom var(--transition-fast);
}

.nav-toggle-bar + .nav-toggle-bar {
  margin-top: 4px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Open state */

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

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

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

/* Responsive behavior */

@media (max-width: 900px) {
  .header-inner {
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }

  .brand-tagline {
    display: none;
  }

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

  .site-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    padding-inline: var(--container-padding-x);
    padding-bottom: var(--space-4);
    transform-origin: top;
  }

  .nav-list {
    position: relative;
    margin-top: var(--space-3);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.98), rgba(17, 24, 39, 0.98));
    border: 1px solid rgba(55, 65, 81, 0.9);
    box-shadow: var(--shadow-md);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transform: scaleY(0.8);
    transition: max-height var(--transition-slow), opacity var(--transition-normal), transform var(--transition-normal);
  }

  .site-header.menu-open .nav-list {
    max-height: 320px;
    opacity: 1;
    transform: scaleY(1);
  }

  .nav-link {
    padding-block: 0.5rem;
  }

  .nav-item.nav-cta {
    margin-left: 0;
    margin-top: var(--space-2);
  }

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

@media (max-width: 480px) {
  .brand-name {
    font-size: var(--text-base);
  }
}