/* Header layout */
.hl-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 244, 241, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.hl-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  gap: var(--space-8);
}

/* Brand */
.hl-header__brand {
  display: flex;
  align-items: center;
}

.hl-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hl-header__logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(17, 17, 17, 0.12);
  background: radial-gradient(circle at 30% 20%, #ffffff, #f7f4f1 42%, #e1d4c3 100%);
  box-shadow: var(--shadow-sm);
}

.hl-header__logo-text {
  font-weight: 500;
}

/* Navigation */
.hl-header__nav {
  margin-left: auto;
}

.hl-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-10);
  list-style: none;
}

.hl-header__nav-link {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-gray-700);
  padding-bottom: 0.15rem;
}

.hl-header__nav-link::after {
  height: 2px;
}

.hl-header__nav-item--highlight .hl-header__nav-link {
  color: var(--color-accent-dark);
}

/* Meta icons */
.hl-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-left: var(--space-12);
}

.hl-header__icon-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  color: var(--color-gray-700);
  background-color: var(--color-surface);
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast);
}

.hl-header__icon-link:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.hl-header__icon-link--accent {
  background-color: var(--color-accent-dark);
  color: #ffffff;
  border-color: transparent;
}

.hl-header__icon-link--accent:hover {
  background-color: #000000;
  color: #ffffff;
}

/* Mobile toggle */
button.hl-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface);
}

.hl-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-accent-dark);
  transition: transform var(--transition-fast), opacity var(--transition-fast), translate var(--transition-fast);
}



/* Open state animations */
.hl-header__toggle[aria-expanded="true"] .hl-header__toggle-bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.hl-header__toggle[aria-expanded="true"] .hl-header__toggle-bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 900px) {
  .hl-header__inner {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  button.hl-header__toggle {
    display: inline-flex;
  }

  .hl-header__nav {
    position: fixed;
    inset: 56px 0 auto 0;
    background-color: rgba(247, 244, 241, 0.98);
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .hl-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-10) var(--space-16) var(--space-12);
    gap: var(--space-6);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-4px);
    transition:
      max-height var(--transition-slow),
      opacity var(--transition-base),
      transform var(--transition-base);
  }

  .hl-header__nav-list.is-open {
    max-height: 320px;
    opacity: 1;
    transform: translateY(0);
  }

  .hl-header__nav-link {
    font-size: var(--font-size-md);
    letter-spacing: 0.16em;
    padding: 0.3rem 0;
  }

  .hl-header__meta {
    margin-left: 0;
  }
}

@media (max-width: 640px) {
  .hl-header__inner {
    gap: var(--space-6);
  }

  .hl-header__logo-text {
    font-size: 0.95rem;
  }

  .hl-header__meta {
    gap: var(--space-4);
  }

  .hl-header__icon-link {
    width: 32px;
    height: 32px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .hl-header__nav-list,
  .hl-header__toggle-bar {
    transition: none;
  }
}