/* Header styles for Pack Organize */

.po-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
}

.po-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.po-header__brand {
  display: flex;
  align-items: center;
}

.po-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
}

.po-header__logo-mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 30% 20%, #e0f2f5 0, #1f7a8c 55%, #155768 100%);
  box-shadow: var(--shadow-sm);
}

.po-header__logo-text {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--font-size-lg);
  letter-spacing: 0.02em;
}

/* Navigation */

.po-header__nav {
  margin-left: auto;
}

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

.po-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.25rem 0;
}

.po-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
}

.po-header__nav-link:hover,
.po-header__nav-link:focus-visible {
  color: var(--color-text);
}

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

/* Actions (account, cart) */

.po-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: var(--space-4);
}

.po-header__icon-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-200);
  color: var(--color-text);
  background-color: #ffffff;
  box-shadow: var(--shadow-xs);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast);
}

.po-header__icon-link i {
  font-size: 1rem;
}

.po-header__icon-link:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

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

.po-header__icon-link--cart {
  padding-right: 0.45rem;
}

.po-header__cart-count {
  position: absolute;
  top: -0.35rem;
  right: -0.2rem;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.25rem;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: var(--font-size-xs);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

/* Mobile toggle */

.po-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  box-shadow: var(--shadow-xs);
}

.po-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), width var(--transition-normal);
}

/* Mobile state: when nav is open */

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

.po-header--nav-open .po-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

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

/* Responsive layout */

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

  .po-header__toggle {
    display: inline-flex;
  }

  .po-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
    transform-origin: top;
  }

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

  .po-header__nav-link {
    width: 100%;
  }

  /* JS-enhanced closed state: hidden via class so nav stays accessible without JS */
  .po-header__nav--collapsed {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height var(--transition-slow), opacity var(--transition-normal);
  }

  .po-header__nav--expanded {
    max-height: 320px;
    opacity: 1;
    pointer-events: auto;
  }

  .po-header__nav-list:focus-within {
    outline: none;
  }

  .po-header__nav + .po-header__actions {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  .po-header__logo-text {
    font-size: var(--font-size-md);
  }

  .po-header__actions {
    gap: var(--space-2);
  }
}