/* ==========================================================================
   FLUX PRIME — category.css
   Category / listing page: filter sidebar, toolbar, results grid.
   Requires: base.css, product-grid.css, js/category-filters.js
   ========================================================================== */

/* The page head and breadcrumb are shared chrome and live in base.css,
   because every page that is not the home page uses them. */


/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.catalog {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: var(--space-6) clamp(var(--space-5), 3vw, var(--space-7));
  align-items: start;
  padding-block: var(--space-6) var(--space-9);
}

/* --------------------------------------------------------------------------
   Filter sidebar
   -------------------------------------------------------------------------- */
.filters {
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
  max-height: calc(100vh - var(--header-h) - var(--space-7));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: var(--space-2);
}

.filters__head {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--color-bg);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.filters__title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
}
.filters__clear {
  font-size: var(--text-sm);
  color: var(--color-accent);
}
.filters__clear:hover { text-decoration: underline; }
.filters__clear[disabled] {
  color: var(--color-text-faint);
  pointer-events: none;
}

.filters__close { display: none; }

/* --- Group --- */
.filter-group { border-bottom: 1px solid var(--color-border); }

.filter-group > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
}
.filter-group > summary::-webkit-details-marker { display: none; }
.filter-group > summary::marker { content: ""; }
.filter-group__chev {
  width: 16px; height: 16px;
  flex-shrink: 0;
  color: var(--color-text-light);
  transition: transform var(--dur-fast) var(--ease-out);
}
.filter-group[open] .filter-group__chev { transform: rotate(180deg); }

.filter-group__body {
  display: grid;
  gap: 2px;
  padding-bottom: var(--space-4);
}

/* --- Option rows --- */
.filter-opt {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.4rem 0.35rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.filter-opt:hover { background: var(--color-surface-2); color: var(--color-text); }
.filter-opt input { position: absolute; opacity: 0; width: 0; height: 0; }

.filter-opt__box {
  position: relative;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.filter-opt input[type="radio"] + .filter-opt__box { border-radius: 50%; }

.filter-opt__box::after {
  content: "";
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 11px;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
  /* tick, drawn as a data URI so there is no icon request */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a0a0a' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
}
.filter-opt input[type="radio"] + .filter-opt__box::after {
  inset: 4px;
  border-radius: 50%;
  background: var(--color-accent-ink);
  background-image: none;
}
.filter-opt input:checked + .filter-opt__box {
  background: var(--color-accent);
  border-color: var(--color-accent);
}
.filter-opt input:checked + .filter-opt__box::after { opacity: 1; }
.filter-opt input:focus-visible + .filter-opt__box {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.filter-opt input:checked ~ .filter-opt__label { color: var(--color-text); }

.filter-opt__label { flex: 1; }
.filter-opt__count {
  font-size: 0.75rem;
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
}

.filter-opt__stars { color: var(--color-accent); letter-spacing: 1px; }

/* --- Price --- */
.price-fields {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.price-fields .input { padding: 0.55em 0.6em; font-size: 0.875rem; }
.price-fields span { color: var(--color-text-faint); }

/* --------------------------------------------------------------------------
   Toolbar
   -------------------------------------------------------------------------- */
.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.catalog-count {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.catalog-count b { color: var(--color-text); font-weight: 600; }

.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.sort-field {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-light);
}
.sort-field .select {
  width: auto;
  padding: 0.5em 2em 0.5em 0.75em;
  font-size: 0.875rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-opacity='0.5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6em center;
  background-size: 14px;
}
.filters-toggle { display: none; }

/* --- Active filter chips --- */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-4);
}
.active-filters:empty { display: none; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.35em 0.4em 0.35em 0.75em;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}
.chip button {
  display: inline-grid;
  place-items: center;
  width: 18px; height: 18px;
  border-radius: 50%;
  color: var(--color-text-faint);
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.chip button:hover { background: var(--color-danger); color: var(--color-bg); }
.chip svg { width: 11px; height: 11px; }

/* --------------------------------------------------------------------------
   Results grid — 6 across on a wide screen, 5 on a normal desktop
   -------------------------------------------------------------------------- */
.catalog-results { padding-top: var(--space-5); }

.product-grid.product-grid--catalog {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
}
@media (max-width: 1500px) { .product-grid.product-grid--catalog { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
@media (max-width: 1240px) { .product-grid.product-grid--catalog { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (max-width: 860px)  { .product-grid.product-grid--catalog { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 680px)  { .product-grid.product-grid--catalog { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* Cards get narrower here than on the home page, so trim the inner padding. */
.product-grid--catalog .product-card__body { padding: var(--space-3) 0.7rem; }
.product-grid--catalog .product-card__foot { padding: 0 0.7rem 0.7rem; }
.product-grid--catalog .product-card__title { font-size: 0.8125rem; }
.product-grid--catalog .price { font-size: 0.95rem; }

.product-grid li[hidden] { display: none; }

/* --- Empty state --- */
.catalog-empty {
  display: none;
  padding: var(--space-9) var(--space-4);
  text-align: center;
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
}
.catalog-empty.is-shown { display: block; }
.catalog-empty svg {
  width: 34px; height: 34px;
  margin: 0 auto var(--space-4);
  color: var(--color-text-faint);
}
.catalog-empty__title { font-size: var(--text-xl); }
.catalog-empty__text {
  margin-top: var(--space-2);
  color: var(--color-text-light);
  font-size: var(--text-sm);
}
.catalog-empty .btn { margin-top: var(--space-5); }

/* --------------------------------------------------------------------------
   Mobile — sidebar becomes a slide-in panel
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .catalog { grid-template-columns: minmax(0, 1fr); }

  .filters-toggle {
    display: inline-flex;
    gap: 0.5em;
  }
  .filters-toggle__count {
    display: inline-grid;
    place-items: center;
    min-width: 18px; height: 18px;
    padding: 0 5px;
    background: var(--color-accent);
    color: var(--color-accent-ink);
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 600;
  }
  .filters-toggle__count:empty { display: none; }

  .filters {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: var(--z-drawer);
    width: min(340px, 86vw);
    max-height: none;
    padding: var(--space-5);
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform var(--dur-mid) var(--ease-out),
                visibility var(--dur-mid);
  }
  .filters.is-open { transform: none; visibility: visible; }

  .filters__close {
    display: inline-grid;
    place-items: center;
    width: 32px; height: 32px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
  }
  .filters__close:hover { background: var(--color-surface-2); color: var(--color-text); }
  .filters__close svg { width: 16px; height: 16px; }

  .filters__scrim {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-drawer) - 1);
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--dur-mid) var(--ease-out), visibility var(--dur-mid);
  }
  .filters__scrim.is-open { opacity: 1; visibility: visible; }
}

@media (min-width: 1101px) {
  .filters__scrim { display: none; }
}

@media (max-width: 560px) {
  .catalog-toolbar { align-items: stretch; }
  .toolbar-right { width: 100%; justify-content: space-between; }
  .sort-field span { display: none; }
}

/* --------------------------------------------------------------------------
   Server-rendered filters
   The sidebar is a GET form, so it needs a submit button for anyone without
   JavaScript, and the results need real page links.
   -------------------------------------------------------------------------- */
.filters__foot { padding-block: var(--space-5); }
.filters__foot .btn { width: 100%; }
/* With JavaScript the form submits itself, so the button is redundant. */
.js .filters__foot { display: none; }

.chip:hover { border-color: var(--color-border-strong); color: var(--color-text); }
.chip svg { opacity: 0.6; }
.chip:hover svg { opacity: 1; }

.catalog-pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-block: var(--space-7) var(--space-4);
}
.catalog-pager a,
.catalog-pager__current {
  display: inline-grid;
  place-items: center;
  min-width: 36px;
  padding: 0.45em 0.7em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.catalog-pager a:hover {
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.catalog-pager__current {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: #fff;
  font-weight: 600;
}
.catalog-pager .btn { min-width: auto; }

.sort-field noscript { display: inline-flex; }