/* ==========================================================================
   Component: Book listing (sidebar filters + product grid)
   Used by category.html and search.html
   Requires: common.css, product-carousel.css (product card styles)
   ========================================================================== */

.di-listing { padding-block: 26px 40px; }

.di-listing__head {
  margin-bottom: 22px;
}

.di-listing__title {
  margin: 0 0 6px;
  font-size: clamp(1.4rem, 1.15rem + 1.1vw, 1.9rem);
  font-weight: 600;
  color: var(--di-text);
}

.di-listing__intro {
  margin: 0;
  max-width: 720px;
  font-size: var(--di-fs-sm);
  color: var(--di-text-muted);
}

.di-listing__layout {
  display: grid;
  grid-template-columns: 258px minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

/* --------------------------------------------------------------------------
   Filters
   -------------------------------------------------------------------------- */

.di-filters {
  position: sticky;
  top: 16px;
  border: 1px solid var(--di-border);
  border-radius: var(--di-radius);
  background-color: var(--di-white);
  overflow: hidden;
}

.di-filters__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--di-border);
  background-color: var(--di-cream);
}

.di-filters__title {
  margin: 0;
  font-size: var(--di-fs-sm);
  font-weight: 600;
}

.di-filters__reset {
  border: 0;
  padding: 0;
  background: transparent;
  font-family: inherit;
  font-size: var(--di-fs-xs);
  color: var(--di-text-muted);
  cursor: pointer;
}

.di-filters__reset:hover { color: #b03a2e; }

.di-filtergroup {
  border-bottom: 1px solid var(--di-border);
}

.di-filtergroup:last-child { border-bottom: 0; }

.di-filtergroup__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  padding: 14px 16px;
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: var(--di-fs-sm);
  font-weight: 500;
  color: var(--di-text);
  text-align: left;
  cursor: pointer;
}

.di-filtergroup__toggle .di-icon { transition: transform var(--di-transition); }
.di-filtergroup__toggle[aria-expanded="false"] .di-icon { transform: rotate(-90deg); }

.di-filtergroup__body {
  max-height: 260px;
  overflow-y: auto;
  padding: 0 16px 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--di-border) transparent;
}

.di-filtergroup__body[hidden] { display: none; }

.di-filter {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 5px 0;
  font-size: var(--di-fs-sm);
  color: var(--di-text);
  cursor: pointer;
}

.di-filter input {
  width: 16px;
  height: 16px;
  accent-color: var(--di-green);
  cursor: pointer;
}

.di-filter__count {
  margin-left: auto;
  font-size: var(--di-fs-xs);
  color: var(--di-text-muted);
}

.di-filter:hover { color: var(--di-green); }

/* Mobile filter trigger + backdrop */
.di-filters__open {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--di-border);
  border-radius: var(--di-radius-sm);
  background-color: var(--di-white);
  font-family: inherit;
  font-size: var(--di-fs-sm);
  font-weight: 500;
  cursor: pointer;
}

.di-filters__close { display: none; }

/* --------------------------------------------------------------------------
   Toolbar + grid
   -------------------------------------------------------------------------- */

.di-listing__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
  padding: 12px 16px;
  border: 1px solid var(--di-border);
  border-radius: var(--di-radius);
  background-color: var(--di-cream);
}

.di-listing__count {
  margin: 0;
  font-size: var(--di-fs-sm);
  color: var(--di-text-muted);
}

.di-listing__count strong { color: var(--di-text); font-weight: 600; }

.di-listing__sort {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--di-fs-sm);
  color: var(--di-text-muted);
}

.di-listing__sort select {
  padding: 7px 12px;
  border: 1px solid var(--di-border);
  border-radius: var(--di-radius-sm);
  background-color: var(--di-white);
  font-family: inherit;
  font-size: var(--di-fs-sm);
  color: var(--di-text);
  cursor: pointer;
}

/* Active filter chips */
.di-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.di-chips:empty { margin: 0; }

.di-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid var(--di-border);
  border-radius: var(--di-radius-pill);
  background-color: var(--di-white);
  font-size: var(--di-fs-xs);
  color: var(--di-text);
}

.di-chip button {
  border: 0;
  padding: 0;
  background: transparent;
  font-size: 13px;
  line-height: 1;
  color: var(--di-text-muted);
  cursor: pointer;
}

.di-chip button:hover { color: #b03a2e; }

.di-booksgrid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.di-booksgrid > li[hidden] { display: none; }

/* Empty state */
.di-listing__empty {
  padding: 50px 20px;
  text-align: center;
}

.di-listing__empty h2 {
  margin: 12px 0 6px;
  font-size: var(--di-fs-md);
  font-weight: 600;
}

.di-listing__empty p {
  margin: 0 0 16px;
  font-size: var(--di-fs-sm);
  color: var(--di-text-muted);
}

.di-listing__empty[hidden] { display: none; }

/* Load more */
.di-listing__more {
  margin-top: 26px;
  text-align: center;
}

.di-listing__more[hidden] { display: none; }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1199.98px) {
  .di-booksgrid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 991.98px) {
  .di-listing__layout { grid-template-columns: 1fr; }

  .di-filters__open { display: inline-flex; }

  /* Filters slide in from the left on small screens */
  .di-filters {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 1050;
    width: min(320px, 88vw);
    border-radius: 0;
    border: 0;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform .28s ease, visibility .28s ease;
  }

  .di-filters.is-open { transform: none; visibility: visible; }

  .di-filters__body {
    flex: 1 1 auto;
    overflow-y: auto;
  }

  .di-filters__close {
    display: inline-flex;
    padding: 6px;
    border: 0;
    background: transparent;
    cursor: pointer;
  }

  .di-filtergroup__body { max-height: none; }
}

@media (max-width: 767.98px) {
  .di-booksgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 14px; }
  .di-listing__toolbar { padding: 10px 12px; }
}

@media (max-width: 400px) {
  .di-booksgrid { grid-template-columns: 1fr; }
}