/**
 * Accordion primitives
 * Collapsible sections, FAQ, LMS accordions
 */
@layer ks-primitives {
  /* ==========================================================================
     Generic Accordion (FAQ style)
     ========================================================================== */

  .ks-accordion-item {
    background: var(--ks-color-gray-50);
    border: 1px solid var(--ks-color-gray-200);
    border-radius: var(--ks-radius-lg);
    overflow: hidden;
  }

  :where(.dark) .ks-accordion-item {
    background: var(--ks-color-gray-800);
    border-color: var(--ks-color-gray-700);
  }

  .ks-accordion-item__header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--ks-space-4) var(--ks-space-6);
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 200ms var(--ks-ease-standard);
  }

  .ks-accordion-item__header:hover {
    background: var(--ks-color-gray-100);
  }

  :where(.dark) .ks-accordion-item__header:hover {
    background: var(--ks-color-gray-700);
  }

  .ks-accordion-item__icon {
    transition: transform 200ms var(--ks-ease-standard);
  }

  .ks-accordion-item__icon.ks-rotate-180 {
    transform: rotate(180deg);
  }

  .ks-accordion-item__content {
    padding: var(--ks-space-4) var(--ks-space-6);
    background: var(--ks-color-white);
    border-top: 1px solid var(--ks-color-gray-200);
  }

  :where(.dark) .ks-accordion-item__content {
    background: var(--ks-color-gray-900);
    border-color: var(--ks-color-gray-700);
  }

  /* ==========================================================================
     LMS Level Accordion
     ========================================================================== */

  .level-accordion {
    transition: box-shadow 0.2s var(--ks-ease-standard);
  }

  .level-accordion[open] {
    box-shadow: var(--ks-shadow-sm);
  }

  .level-accordion > summary,
  .module-accordion > summary {
    list-style: none;
    cursor: pointer;
  }

  .level-accordion > summary::-webkit-details-marker,
  .module-accordion > summary::-webkit-details-marker {
    display: none;
  }

  .level-accordion__chevron {
    transform: rotate(0deg);
    transition: transform 0.15s var(--ks-ease-standard);
  }

  .level-accordion[open] > summary .level-accordion__chevron {
    transform: rotate(90deg);
  }

  /* ==========================================================================
     LMS Module Accordion
     ========================================================================== */

  .module-accordion {
    transition: box-shadow 0.15s var(--ks-ease-standard);
  }

  .module-accordion[open] {
    box-shadow: inset 0 0 0 1px var(--ks-color-border-subtle);
  }

  .module-accordion__chevron {
    transform: rotate(0deg);
    transition: transform 0.15s var(--ks-ease-standard);
  }

  .module-accordion[open] > summary .module-accordion__chevron {
    transform: rotate(90deg);
  }

  .module-accordion__summary {
    display: flex;
    align-items: flex-start;
    gap: var(--ks-space-3);
    cursor: pointer;
    padding: var(--ks-space-3) var(--ks-space-4);
  }

  .module-accordion__body {
    flex: 1;
    min-width: 0;
  }

  .module-accordion__content {
    padding: 0 var(--ks-space-4) var(--ks-space-3);
  }

  .module-accordion__empty {
    padding: var(--ks-space-4);
    color: var(--ks-color-text-muted);
  }

  /* ==========================================================================
     Lesson Table (inside accordions)
     ========================================================================== */

  .lesson-table {
    inline-size: 100%;
    border-collapse: collapse;
  }

  .lesson-table thead {
    background-color: var(--ks-color-surface-section);
    border-block-end: 1px solid var(--ks-color-border-subtle);
  }

  .lesson-table th {
    padding: var(--ks-space-2) var(--ks-space-4);
    font-size: var(--ks-font-size-xs);
    font-weight: var(--ks-font-weight-strong);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-align: start;
    color: var(--ks-color-text-muted);
  }

  .lesson-table td {
    padding: var(--ks-space-2) var(--ks-space-4);
    font-size: var(--ks-font-size-sm);
  }

  .lesson-table tbody tr {
    border-block-end: 1px solid var(--ks-color-border-subtle);
  }

  .lesson-table tbody tr:last-child {
    border-bottom: none;
  }

  .lesson-table__col-num,
  .lesson-table__num {
    text-align: center;
    color: var(--ks-color-text-muted);
  }

  .lesson-table__col-action,
  .lesson-table__action {
    text-align: end;
  }

  .lesson-row--expandable {
    cursor: pointer;
  }

  .lesson-activity-icons {
    display: inline-flex;
    align-items: center;
    gap: var(--ks-space-1);
  }

  .lesson-activities {
    display: flex;
    flex-direction: column;
    gap: var(--ks-space-2);
    padding: var(--ks-space-2) 0;
  }

  .lesson-edit-icon svg {
    width: 1rem;
    height: 1rem;
    transition: transform 0.15s var(--ks-ease-standard);
  }

  .lesson-edit-icon:hover svg {
    transform: scale(1.25);
  }

  .lesson-check-empty {
    display: inline-block;
    width: 1.125rem;
    height: 1.125rem;
    border: 2px solid var(--ks-color-border-default);
    border-radius: var(--ks-radius-full);
  }

  /* ==========================================================================
     Curriculum Accordion (Mobile)
     ========================================================================== */

  .ks-curriculum-accordion {
    display: block;
  }

  @media (min-width: 768px) {
    .ks-curriculum-accordion {
      display: none;
    }
  }

  .ks-curriculum-accordion__item {
    border-radius: var(--ks-radius-lg);
    overflow: hidden;
    border: 1px solid var(--ks-color-primary-200);
    box-shadow: var(--ks-shadow-sm);
    background: var(--ks-color-surface-card);
  }

  :where(.dark) .ks-curriculum-accordion__item {
    border-color: var(--ks-color-gray-600);
    background: var(--ks-color-gray-800);
  }

  .ks-curriculum-accordion__item--alt {
    background: var(--ks-color-gray-50);
  }

  :where(.dark) .ks-curriculum-accordion__item--alt {
    background: var(--ks-color-gray-900);
  }

  .ks-curriculum-accordion__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--ks-space-3) var(--ks-space-4);
    background: linear-gradient(to right, var(--ks-color-tertiary-600), var(--ks-color-primary-600));
    cursor: pointer;
    list-style: none;
  }

  .ks-curriculum-accordion__header::-webkit-details-marker {
    display: none;
  }

  .ks-curriculum-accordion__chevron {
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 200ms var(--ks-ease-standard);
  }

  .group[open] .ks-curriculum-accordion__chevron {
    transform: rotate(180deg);
  }

  .ks-curriculum-accordion__content {
    padding: var(--ks-space-3) var(--ks-space-4);
  }

  /* ==========================================================================
     FAQ Contact CTA
     ========================================================================== */

  .ks-faq-cta {
    background: linear-gradient(
      to bottom right,
      var(--ks-color-primary-50),
      var(--ks-color-secondary-50)
    );
    border-radius: var(--ks-radius-lg);
    padding: var(--ks-space-8);
  }

  :where(.dark) .ks-faq-cta {
    background: linear-gradient(
      to bottom right,
      color-mix(in srgb, var(--ks-color-primary-900) 20%, transparent),
      color-mix(in srgb, var(--ks-color-secondary-900) 20%, transparent)
    );
  }

  /* ==========================================================================
     Responsive Accordion Adjustments
     ========================================================================== */

  @media (max-width: 40rem) {
    .level-accordion > summary {
      padding: var(--ks-space-3);
    }

    .level-accordion__content {
      padding: var(--ks-space-2);
    }

    .module-accordion > summary {
      padding: var(--ks-space-2) var(--ks-space-3);
    }

    .lesson-table th,
    .lesson-table td {
      padding: var(--ks-space-2);
    }

    .lesson-table th:first-child,
    .lesson-table td:first-child {
      width: 2rem;
      padding-inline-start: var(--ks-space-2);
    }

    .lesson-table th:last-child,
    .lesson-table td:last-child {
      width: 3rem;
      padding-inline-end: var(--ks-space-2);
    }
  }
}