/* Header layout */
.vg-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background:
    linear-gradient(to bottom, rgba(10, 13, 22, 0.96), rgba(10, 13, 22, 0.86));
  border-bottom: 1px solid var(--color-border-subtle);
}

.vg-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

/* Brand / logo */
.vg-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25rem 0.35rem;
  border-radius: var(--radius-pill);
}

.vg-header__logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 30% 70% 60% 40%;
  background:
    radial-gradient(circle at 20% 0%, var(--color-primary), transparent 60%),
    radial-gradient(circle at 80% 100%, var(--color-accent-rose), transparent 60%),
    linear-gradient(145deg, var(--color-surface-soft), var(--color-surface));
  box-shadow: var(--shadow-subtle);
}

.vg-header__logo-text {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gray-100);
}

/* Desktop navigation */
.vg-header__nav {
  display: flex;
}

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

.vg-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
}

.vg-header__nav-link::after {
  height: 2px;
  border-radius: 999px;
}

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

.vg-header__nav-link--accent {
  color: var(--color-primary);
}

.vg-header__nav-link--accent::after {
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-rose));
}

/* Mobile toggle */
.vg-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(7, 10, 18, 0.9);
  color: var(--color-text);
}

.vg-header__toggle:focus-visible {
  box-shadow: var(--shadow-focus);
}

.vg-header__toggle-bars {
  position: relative;
  width: 18px;
  height: 14px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.vg-header__toggle-bars span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--color-gray-100);
  transition: transform var(--transition-normal), opacity var(--transition-normal), translate var(--transition-normal);
}

/* Open state */
.vg-header__toggle[aria-expanded="true"] .vg-header__toggle-bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.vg-header__toggle[aria-expanded="true"] .vg-header__toggle-bars span:nth-child(2) {
  opacity: 0;
}

.vg-header__toggle[aria-expanded="true"] .vg-header__toggle-bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile navigation behaviour */
@media (max-width: 768px) {
  .vg-header__toggle {
    display: inline-flex;
  }

  .vg-header__nav {
    position: fixed;
    inset: 0 0 auto 0;
    top: 56px;
    background: rgba(10, 13, 22, 0.96);
    border-bottom: 1px solid var(--color-border-subtle);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
  }

  .vg-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--container-padding-x) var(--space-5);
    gap: var(--space-3);
  }

  .vg-header__nav-link {
    font-size: var(--font-size-md);
  }

  .vg-header__nav--open {
    opacity: 1;
    transform: scaleY(1);
    pointer-events: auto;
  }
}

@media (min-width: 769px) {
  .vg-header__nav {
    position: static;
  }
}

/* High contrast focus for nav links */
.vg-header__nav-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(15, 20, 32, 0.9), 0 0 0 4px rgba(135, 200, 197, 0.85);
  border-radius: var(--radius-pill);
  padding-inline: 0.6rem;
}