/* The shared lesson catalog filter (templates/catalog/_filter.html,
   static/js/catalog-filter.js). Loaded by the portal and by the mounted
   mini-apps, which have their own variables - so the component keeps its
   own colours, with a dark twin under html[data-theme="dark"]. */

.catalog-filter,
.catalog-card-tags,
.catalog-empty {
  --catalog-surface: #ffffff;
  --catalog-border: #dbe3ee;
  --catalog-text: #1b2430;
  --catalog-muted: #5f6f82;
  --catalog-chip: #eef3fb;
  --catalog-chip-text: #24456f;
  --catalog-accent: #234d8b;
  --catalog-accent-text: #ffffff;
  --catalog-focus: #6aa8ff;
}

html[data-theme="dark"] .catalog-filter,
html[data-theme="dark"] .catalog-card-tags,
html[data-theme="dark"] .catalog-empty {
  --catalog-surface: #1c2736;
  --catalog-border: #3b4a5d;
  --catalog-text: #e7edf5;
  --catalog-muted: #aab6c6;
  --catalog-chip: #263447;
  --catalog-chip-text: #dce8fa;
  --catalog-accent: #6aa8ff;
  --catalog-accent-text: #0f1a2a;
  --catalog-focus: #83b8ff;
}

[data-catalog-item][hidden],
[data-catalog-group][hidden],
.catalog-filter [hidden],
.catalog-empty[hidden] {
  display: none !important;
}

.catalog-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* --- Filter bar --- */

.catalog-filter {
  display: grid;
  gap: 1rem;
  margin: 0 0 1.5rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--catalog-border);
  border-radius: 18px;
  background: var(--catalog-surface);
  color: var(--catalog-text);
  box-shadow: 0 10px 28px rgba(26, 35, 56, 0.06);
  scroll-margin-top: 5rem;
}

.catalog-filter-search {
  position: relative;
  display: flex;
  gap: 0.5rem;
}

.catalog-filter-search-icon {
  position: absolute;
  top: 50%;
  left: 0.85rem;
  width: 1.15rem;
  height: 1.15rem;
  transform: translateY(-50%);
  fill: none;
  stroke: var(--catalog-muted);
  stroke-width: 2;
  stroke-linecap: round;
  pointer-events: none;
}

.catalog-filter-search input {
  flex: 1;
  min-width: 0;
  padding: 0.7rem 0.9rem 0.7rem 2.5rem;
  border: 1px solid var(--catalog-border);
  border-radius: 12px;
  background: transparent;
  color: var(--catalog-text);
  font: inherit;
  font-size: 1rem;
}

.catalog-filter-search input::placeholder {
  color: var(--catalog-muted);
}

.catalog-filter-search input:focus {
  outline: 3px solid var(--catalog-focus);
  outline-offset: 1px;
  border-color: transparent;
}

.catalog-filter-submit {
  padding: 0.6rem 1rem;
  border: 0;
  border-radius: 12px;
  background: var(--catalog-accent);
  color: var(--catalog-accent-text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

/* With JavaScript the list filters while typing - no button needed. */
.catalog-filter.is-live .catalog-filter-submit {
  display: none;
}

.catalog-filter-groups {
  display: grid;
  gap: 0.7rem;
}

.catalog-filter-group {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  align-items: start;
  gap: 0.6rem;
}

.catalog-filter-label {
  padding-top: 0.42rem;
  color: var(--catalog-muted);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.catalog-filter-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.catalog-filter-more[open] {
  flex-basis: 100%;
}

.catalog-filter-more > summary {
  width: fit-content;
  padding: 0.32rem 0.68rem;
  border: 1px dashed var(--catalog-border);
  border-radius: 999px;
  color: var(--catalog-muted);
  font-size: 0.78rem;
  font-weight: 700;
  list-style: none;
  cursor: pointer;
}

.catalog-filter-more > summary::-webkit-details-marker {
  display: none;
}

.catalog-filter-more > summary:hover {
  border-color: var(--catalog-accent);
  color: var(--catalog-text);
}

.catalog-filter-more-open,
.catalog-filter-more[open] .catalog-filter-more-closed {
  display: none;
}

.catalog-filter-more[open] .catalog-filter-more-open {
  display: inline;
}

.catalog-filter-more > .catalog-filter-tags {
  margin-top: 0.45rem;
}

.catalog-filter-status {
  margin: 0;
  color: var(--catalog-muted);
  font-size: 0.9rem;
}

.catalog-filter-status strong {
  color: var(--catalog-text);
}

.catalog-filter-status a,
.catalog-empty a {
  color: var(--catalog-accent);
  font-weight: 700;
}

/* --- Tags (filter bar and cards) --- */

.catalog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0 1rem;
}

.catalog-tag,
.catalog-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.32rem 0.68rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--catalog-chip);
  color: var(--catalog-chip-text);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
}

.catalog-tag {
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.catalog-tag:hover {
  border-color: var(--catalog-accent);
}

.catalog-tag:focus-visible {
  outline: 3px solid var(--catalog-focus);
  outline-offset: 2px;
}

.catalog-tag.is-active {
  background: var(--catalog-accent);
  color: var(--catalog-accent-text);
}

.catalog-tag-mode {
  border-color: var(--catalog-border);
  background: transparent;
}

.catalog-chip {
  border-color: var(--catalog-border);
  background: transparent;
  color: var(--catalog-muted);
}

.catalog-tag-count {
  font-weight: 600;
  opacity: 0.7;
}

/* --- Nothing matches --- */

.catalog-empty {
  display: grid;
  justify-items: center;
  gap: 0.4rem;
  margin: 0 0 1.5rem;
  padding: 2rem 1rem;
  border: 1px dashed var(--catalog-border);
  border-radius: 18px;
  color: var(--catalog-muted);
  text-align: center;
}

.catalog-empty p {
  margin: 0;
  color: var(--catalog-text);
  font-weight: 700;
}

@media (max-width: 560px) {
  .catalog-filter {
    padding: 0.95rem;
  }

  .catalog-filter-group {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .catalog-filter-label {
    padding-top: 0;
  }
}

@media print {
  .catalog-filter,
  .catalog-empty {
    display: none;
  }
}