/* ============================================
   Responsive — media queries for adaptive layout
   ============================================ */

/* =====================
   LARGE DESKTOP (>=1400px)
   ===================== */
@media (min-width: 1400px) {
  :root {
    --card-width: 220px;
  }
}

/* =====================
   DESKTOP (992 – 1199px)
   ===================== */
@media (max-width: 1199.98px) {
  :root {
    --card-width: 190px;
  }

  .material-card--book {
    width: 170px;
  }

  .material-card--methodology {
    width: 240px;
  }
}

/* =====================
   TABLET (768 – 991px)
   ===================== */
@media (max-width: 991.98px) {
  :root {
    --card-width: 180px;
    --card-gap: 12px;
  }

  .material-card--book {
    width: 160px;
  }

  .material-card--methodology {
    width: 220px;
  }

  .header-nav {
    gap: var(--space-base);
  }

  .header-nav a span.nav-text {
    display: none;
  }

  .search-box {
    padding: var(--space-base);
  }

  .filter-pills {
    gap: 6px;
  }

  .filter-pill {
    padding: 5px 10px;
    font-size: var(--font-size-sm);
  }

  .footer-top__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* =====================
   SMALL TABLET / LARGE PHONE (576 – 767px)
   ===================== */
@media (max-width: 767.98px) {
  :root {
    --card-width: 170px;
    --card-gap: 10px;
    --header-height: 56px;
  }

  .site-header .container {
    gap: var(--space-sm);
  }

  .site-header {
    border-radius: 12px;
  }

  .header-logo svg {
    height: 20px;
  }

  .btn-catalog {
    padding: 6px 12px;
    font-size: var(--font-size-sm);
    height: 40px;
  }

  .header-nav {
    gap: var(--space-md);
  }

  .header-nav .nav-text {
    display: none;
  }

  .search-box {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  .filter-pills {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--space-xs);
    scrollbar-width: none;
  }

  .filter-pills::-webkit-scrollbar {
    height: 0;
  }

  .section-header {
    flex-wrap: wrap;
    gap: var(--space-xs);
  }

  .section-title {
    font-size: var(--font-size-lg);
  }

  .content-section {
    margin-bottom: var(--space-lg);
  }

  .material-card--book {
    width: 150px;
  }

  .material-card--methodology {
    width: 200px;
  }

  .scroll-arrow {
    width: 30px;
    height: 30px;
  }

  .footer-top__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer-bottom__grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom-col--right {
    align-items: stretch;
    text-align: left;
  }

  .footer-copyright {
    text-align: right;
  }
}

/* =====================
   PHONE (<576px)
   ===================== */
@media (max-width: 575.98px) {
  :root {
    --card-width: 160px;
    --card-gap: 10px;
    --header-height: 52px;
  }

  body {
    font-size: var(--font-size-sm);
  }

  .site-header .container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .site-header {
    border-radius: 10px;
  }

  .header-logo svg {
    height: 18px;
  }

  .btn-catalog {
    padding: 5px 10px;
    font-size: var(--font-size-sm);
    gap: 4px;
    height: 36px;
  }

  .btn-catalog .catalog-text {
    display: none;
  }

  .header-nav a {
    font-size: var(--font-size-sm);
  }

  .breadcrumb-bar {
    padding: var(--space-sm) 0;
  }

  .search-box {
    margin-bottom: var(--space-base);
    padding: var(--space-md);
  }

  .search-input-wrap input {
    padding: 8px 12px;
    font-size: var(--font-size-base);
  }

  .btn-search {
    width: 40px;
    height: 38px;
  }

  .filter-pill {
    padding: 4px 8px;
    font-size: var(--font-size-xs);
  }

  .section-title {
    font-size: var(--font-size-md);
  }

  .section-show-all {
    font-size: var(--font-size-sm);
  }

  .material-card--book {
    width: 140px;
  }

  .material-card {
    width: 160px;
  }

  .material-card--methodology {
    width: 200px;
  }

  .card-title {
    font-size: var(--font-size-sm);
  }

  .card-description {
    font-size: var(--font-size-xs);
  }

  .scroll-arrow {
    display: none;
  }

  .footer-top {
    padding: var(--space-xl) 0;
  }

  .footer-bottom {
    padding: var(--space-base) 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }
}