/**
 * CBTAPPS Design System - Navigation Components
 * Version: 1.0.0
 *
 * Navigation component system including navbar, sidebar,
 * breadcrumbs, pagination, and tabs.
 */

/* ============================================
 * NAVBAR
 * ============================================ */

.cbt-navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) var(--spacing-6);
  background-color: var(--color-background-primary);
  border-bottom: 1px solid var(--color-border-default);
  box-shadow: var(--shadow-sm);

  &--fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
  }

  &--dark {
    background-color: var(--color-neutral-900);
    border-bottom-color: var(--color-neutral-700);
    color: var(--color-neutral-0);

    .cbt-navbar__link {
      color: var(--color-neutral-300);

      &:hover,
      &--active {
        color: var(--color-neutral-0);
      }
    }
  }
}

.cbt-navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;

  &:hover {
    text-decoration: none;
    color: var(--color-primary-500);
  }
}

.cbt-navbar__logo {
  height: 32px;
  width: auto;
}

.cbt-navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.cbt-navbar__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);

  &:hover {
    color: var(--color-text-primary);
    background-color: var(--color-background-secondary);
    text-decoration: none;
  }

  &--active {
    color: var(--color-primary-500);
    background-color: var(--color-primary-50);
  }
}

.cbt-navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

/* ============================================
 * SIDEBAR
 * ============================================ */

.cbt-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: var(--z-index-fixed);
  width: 256px;
  background-color: var(--color-background-primary);
  border-right: 1px solid var(--color-border-default);
  overflow-y: auto;
  transition: transform var(--transition-base);

  &--collapsed {
    width: 64px;

    .cbt-sidebar__label {
      display: none;
    }

    .cbt-sidebar__link {
      justify-content: center;
      padding: var(--spacing-3);
    }

    .cbt-sidebar__section-title {
      display: none;
    }
  }

  &--right {
    left: auto;
    right: 0;
    border-right: none;
    border-left: 1px solid var(--color-border-default);
  }

  @media (max-width: 768px) {
    transform: translateX(-100%);

    &--open {
      transform: translateX(0);
    }
  }
}

.cbt-sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) var(--spacing-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.cbt-sidebar__content {
  padding: var(--spacing-4);
}

.cbt-sidebar__section {
  margin-bottom: var(--spacing-6);

  &:last-child {
    margin-bottom: 0;
  }
}

.cbt-sidebar__section-title {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.cbt-sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-3);
  margin-bottom: var(--spacing-1);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);

  &:hover {
    color: var(--color-text-primary);
    background-color: var(--color-background-secondary);
    text-decoration: none;
  }

  &--active {
    color: var(--color-primary-500);
    background-color: var(--color-primary-50);
  }

  &__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
  }
}

.cbt-sidebar__footer {
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-border-subtle);
}

/* ============================================
 * BREADCRUMBS
 * ============================================ */

.cbt-breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) 0;
  font-size: var(--font-size-sm);
  list-style: none;
  margin: 0;
}

.cbt-breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);

  &:not(:last-child)::after {
    content: '/';
    color: var(--color-text-tertiary);
  }
}

.cbt-breadcrumbs__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);

  &:hover {
    color: var(--color-primary-500);
    text-decoration: none;
  }
}

.cbt-breadcrumbs__current {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

/* ============================================
 * PAGINATION
 * ============================================ */

.cbt-pagination {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  justify-content: center;

  &--sm {
    .cbt-pagination__item {
      padding: var(--spacing-1) var(--spacing-2);
      font-size: var(--font-size-xs);
      min-width: 28px;
      height: 28px;
    }
  }

  &--lg {
    .cbt-pagination__item {
      padding: var(--spacing-3) var(--spacing-4);
      font-size: var(--font-size-base);
      min-width: 44px;
      height: 44px;
    }
  }
}

.cbt-pagination__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  background-color: var(--color-background-primary);
  cursor: pointer;
  transition: all var(--transition-base);

  &:hover:not(.cbt-pagination__item--active):not(:disabled) {
    background-color: var(--color-background-secondary);
    border-color: var(--color-border-strong);
    text-decoration: none;
    color: var(--color-text-primary);
  }

  &--active {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
    color: var(--color-neutral-0);
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }

  &--ellipsis {
    border: none;
    background: none;
    cursor: default;
  }
}

.cbt-pagination__prev,
.cbt-pagination__next {
  padding: var(--spacing-2) var(--spacing-3);
}

/* ============================================
 * TABS
 * ============================================ */

.cbt-tabs {
  display: flex;
  flex-direction: column;
}

.cbt-tabs__list {
  display: flex;
  gap: var(--spacing-1);
  padding: var(--spacing-1);
  background-color: var(--color-background-secondary);
  border-radius: var(--radius-lg);
  list-style: none;
  margin: 0;

  &--vertical {
    flex-direction: column;
    width: 200px;
  }

  &--underline {
    background: none;
    border-bottom: 2px solid var(--color-border-default);
    border-radius: 0;
    padding: 0;
  }
}

.cbt-tabs__tab {
  flex: 1;
  position: relative;
}

.cbt-tabs__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;

  &:hover {
    color: var(--color-text-primary);
    background-color: var(--color-background-tertiary);
  }

  &[aria-selected="true"] {
    color: var(--color-primary-500);
    background-color: var(--color-background-primary);
    box-shadow: var(--shadow-sm);
  }

  &:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
  }

  /* Underline variant */
  .cbt-tabs__list--underline & {
    background: transparent;
    border-radius: 0;
    border-bottom: 2px solid transparent;
    box-shadow: none;
    margin-bottom: -2px;

    &:hover {
      background: transparent;
      border-bottom-color: var(--color-border-strong);
    }

    &[aria-selected="true"] {
      color: var(--color-primary-500);
      background: transparent;
      border-bottom-color: var(--color-primary-500);
      box-shadow: none;
    }
  }
}

.cbt-tabs__panel {
  padding: var(--spacing-6);
  background-color: var(--color-background-primary);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-4);

  &[hidden] {
    display: none;
  }
}

/* ============================================
 * MENU / DROPDOWN
 * ============================================ */

.cbt-menu {
  position: relative;
  display: inline-block;
}

.cbt-menu__items {
  position: absolute;
  z-index: var(--z-index-dropdown);
  min-width: 180px;
  padding: var(--spacing-2);
  background-color: var(--color-background-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  list-style: none;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);

  &--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  &--right {
    right: 0;
  }

  &--bottom {
    top: calc(100% + var(--spacing-2));
  }
}

.cbt-menu__item {
  display: block;

  &:not(:last-child) {
    margin-bottom: var(--spacing-1);
  }
}

.cbt-menu__button {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: all var(--transition-base);

  &:hover {
    background-color: var(--color-background-secondary);
    text-decoration: none;
    color: var(--color-text-primary);
  }

  &--danger {
    color: var(--color-error-500);

    &:hover {
      background-color: var(--color-error-50);
    }
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}

.cbt-menu__divider {
  height: 1px;
  background-color: var(--color-border-subtle);
  border: none;
  margin: var(--spacing-2) 0;
}

/* ============================================
 * MOBILE OVERLAY
 * ============================================ */

.cbt-sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-index-fixed) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);

  &--visible {
    opacity: 1;
    visibility: visible;
  }

  @media (min-width: 769px) {
    display: none;
  }
}

/* ============================================
 * ACCESSIBILITY
 * ============================================ */

@media (prefers-reduced-motion: reduce) {
  .cbt-navbar__link,
  .cbt-sidebar__link,
  .cbt-breadcrumbs__link,
  .cbt-pagination__item,
  .cbt-tabs__button,
  .cbt-menu__items,
  .cbt-menu__button,
  .cbt-sidebar {
    transition: none;
  }
}

/* Focus visible styles */
.cbt-navbar__link:focus-visible,
.cbt-sidebar__link:focus-visible,
.cbt-breadcrumbs__link:focus-visible,
.cbt-pagination__item:focus-visible,
.cbt-tabs__button:focus-visible,
.cbt-menu__button:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}