/* Header styles for BOK BOK BOOKS LTD */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.site-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);
}

.site-header__branding {
  display: flex;
  align-items: center;
  min-width: 0;
}

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

.site-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-md);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__site-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
}

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

/* Navigation */

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
  padding: 0.35rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.25rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-normal);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.site-header__nav-item--highlight {
  margin-left: var(--space-2);
}

.site-header__nav-link--cta {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.site-header__nav-link--cta::after {
  display: none;
}

.site-header__nav-link--cta:hover {
  background-color: var(--color-primary-strong);
}

/* Mobile menu toggle */

.site-header__menu-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  color: var(--gray-800);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

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

.site-header__menu-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.site-header__menu-toggle-icon span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.site-header__menu-toggle-text {
  font-weight: 500;
}

/* Mobile and tablet layout */

@media (max-width: 768px) {
  .site-header__inner {
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
  }

  .site-header__menu-toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transition:
      opacity var(--transition-normal),
      transform var(--transition-normal),
      max-height var(--transition-normal),
      visibility var(--transition-normal);
  }

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

  .site-header__nav-item--highlight {
    margin-left: 0;
    width: 100%;
  }

  .site-header__nav-link--cta {
    width: 100%;
    justify-content: center;
  }

  /* When JS adds the open class */
  .site-header__nav--open {
    opacity: 1;
    visibility: visible;
    transform: scaleY(1);
    max-height: 420px;
  }

  /* Animate hamburger into an X */
  .site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon span:nth-child(2) {
    opacity: 0;
  }

  .site-header__menu-toggle[aria-expanded="true"] .site-header__menu-toggle-icon span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__menu-toggle-icon span {
    transition: none;
  }
}