/* ==========================================================================
   Training Platform — Responsive Behavior
   Spec: TRAINING_DESIGN_STANDARDS.md §16 (Component Responsive Behavior)
   Breakpoints reviewed at: 320, 768, 1024, 1440
   ========================================================================== */

/* ─────────────────────────── < 640px (mobile) ─────────────────────────── */

@media (max-width: 640px) {
  /* Page gutter tightens */
  .training-page #main-content {
    padding-block: var(--space-md);
  }

  /* Headers stack CTA below copy */
  .training-list__header,
  .training-form-shell__header,
  .training-detail__hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  /* Primary CTAs become full-width on mobile (no edge-case cramping) */
  .training-detail__hero-actions .training-btn {
    width: 100%;
  }

  /* Hero — media first, then copy (§16.1) */
  .training-detail__hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .training-detail__hero-media {
    order: -1;
  }

  .training-detail__title {
    font-size: 1.75rem;
  }

  /* Fact strip wraps to 2-row grid, never shrinks below legibility */
  .training-fact-strip {
    flex-wrap: wrap;
  }
  .training-fact-strip__item {
    flex: 1 1 50%;
    border-inline-end: 0;
    border-bottom: 1px solid var(--ahruf-border);
  }
  .training-fact-strip__item:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  /* List → single column */
  .training-list__body {
    grid-template-columns: 1fr;
  }
  .training-list__grid {
    grid-template-columns: 1fr;
  }

  /* Filter becomes a drawer — hidden by default, shown when open */
  .training-filter-panel {
    position: fixed;
    top: 0;
    inset-inline-end: 0;
    bottom: 0;
    width: min(360px, 92vw);
    z-index: 60;
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    box-shadow: var(--training-shadow-lg);
    transform: translateX(100%);
    transition: transform var(--dur-3) var(--ease-standard);
    overflow-y: auto;
  }
  html[dir="rtl"] .training-filter-panel {
    transform: translateX(-100%);
    inset-inline-end: auto;
    inset-inline-start: 0;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  }
  .training-filter-panel.is-open {
    transform: translateX(0);
  }

  .training-filter-panel__close {
    display: inline-flex;
  }
  .training-list__filter-toggle {
    display: inline-flex;
  }

  /* Section split becomes single column */
  .training-detail__section--split {
    grid-template-columns: 1fr;
  }

  /* Sticky tabs: keep but reduce height */
  .training-section-tabs[data-sticky="true"] {
    top: 56px;
  }
  .training-pill-rail[data-sticky="true"] {
    top: 56px;
  }

  /* Form sections flatten padding */
  .training-form-section__header,
  .training-form-section__body {
    padding: var(--space-md);
  }

  /* Form footer: full-width sticky action footer (§16.1) */
  .training-form__footer {
    flex-wrap: wrap;
    padding: var(--space-sm) var(--space-md);
  }
  .training-form__footer > .training-btn {
    flex: 1 1 auto;
    min-width: 0;
  }
  .training-form__footer-delete {
    flex: 1 1 100%;
    order: -1;
    justify-content: center;
  }

  /* Glass banned < 640px (§6.3) */
  .training-page .glass,
  .training-page [class*="glass"] {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  /* Delete card shrinks padding */
  .training-delete-card {
    padding: var(--space-lg);
  }

  /* Modals become bottom sheets */
  .training-modal {
    inset-block-end: 0;
    inset-block-start: auto;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-width: 100%;
  }

  /* Stepper: hide labels on narrow screens, numbers only */
  .training-stepper__label {
    font-size: 0.75rem;
  }
}

/* ─────────────────────────── 640px → 1024px (tablet) ─────────────────────────── */

@media (min-width: 641px) and (max-width: 1023px) {
  .training-list__body {
    grid-template-columns: 220px 1fr;
    gap: var(--space-lg);
  }

  .training-list__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .training-detail__hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .training-detail__hero-media {
    order: -1;
  }

  .training-detail__section--split {
    grid-template-columns: 1fr;
  }
}

/* ─────────────────────────── ≥ 1024px (desktop) ─────────────────────────── */

@media (min-width: 1024px) {
  .training-list__grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

/* ─────────────────────────── Touch target enforcement ─────────────────────────── */

@media (pointer: coarse) {
  .training-btn,
  .training-pill,
  .training-breadcrumb__link,
  .training-accordion__trigger {
    min-height: 44px;
  }
}