/* Header styles for PAC CAD LTD */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.22), rgba(15, 23, 42, 0.96));
  border-bottom: 1px solid rgba(148, 163, 184, 0.45);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

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

.header-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
}

.logo-mark {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.6rem;
  background: conic-gradient(from 180deg, #06b6d4, #1e40af, #0f172a, #06b6d4);
  position: relative;
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9), var(--shadow-sm);
}

.logo-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 0.5rem;
  background: radial-gradient(circle at 30% 20%, rgba(148, 163, 184, 0.25), transparent 55%),
              radial-gradient(circle at 80% 90%, rgba(15, 23, 42, 0.9), #020617);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-title {
  font-size: var(--font-size-lg);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.logo-subtitle {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
}

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

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

.nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  padding-block: 0.35rem;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #06b6d4, #1d4ed8);
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #e5e7eb;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 100%;
}

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

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

/* Mobile nav toggle */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.08), rgba(15, 23, 42, 0.98));
  cursor: pointer;
}

.nav-toggle-bar {
  width: 1.15rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-200);
  transition: transform var(--transition-fast), opacity var(--transition-fast),
              translate var(--transition-fast);
}

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

/* Mobile layout */

@media (max-width: 768px) {
  .header-inner {
    padding-block: var(--space-3);
  }

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

  .site-nav {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-normal), opacity var(--transition-normal),
                visibility var(--transition-normal);
    background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.28), #020617);
    border-bottom: 1px solid rgba(148, 163, 184, 0.5);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6) var(--space-4) var(--space-4);
    gap: var(--space-3);
  }

  .nav-item:last-child {
    margin-top: var(--space-2);
    width: 100%;
  }

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

  .site-header {
    backdrop-filter: blur(14px);
  }

  .nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(3px, 4px);
  }

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

  .nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -4px);
  }
}

/* Medium screens adjustments */

@media (min-width: 769px) and (max-width: 960px) {
  .nav-list {
    gap: var(--space-3);
  }

  .logo-title {
    font-size: var(--font-size-md);
  }

  .logo-subtitle {
    display: none;
  }
}

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

  .logo-title {
    font-size: var(--font-size-md);
  }
}