/* ============================================================
   /docencia/ejercicios/ — banco de ejercicios filtrable
   Hereda paleta de /style.css.
   ============================================================ */

.banco-head {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.banco-head h1 { font-size: 1.75rem; margin: 0.3rem 0 0.5rem; }
.banco-head p { color: var(--text-soft); max-width: 45rem; }

.banco-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  padding: 0 0 4rem;
}
@media (max-width: 820px) {
  .banco-layout { grid-template-columns: 1fr; gap: 1rem; }
}

/* ---- SIDEBAR ---- */
.banco-sidebar {
  position: sticky;
  top: 72px;
  align-self: start;
  max-height: calc(100vh - 90px);
  overflow-y: auto;
  padding-right: 0.5rem;
  font-size: 0.88rem;
}
@media (max-width: 820px) {
  .banco-sidebar {
    position: static;
    max-height: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    background: var(--bg-subtle);
  }
}

.banco-search {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.banco-search input {
  flex: 1;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
}
.banco-search input:focus {
  outline: none;
  border-color: var(--text);
}

.banco-clear {
  width: 100%;
  padding: 0.5rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-family: var(--font);
  font-size: 0.82rem;
  cursor: pointer;
  margin-bottom: 1.25rem;
  transition: all 0.15s;
}
.banco-clear:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--bg-hover);
}
.banco-clear:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.facet {
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.9rem;
}
.facet:last-child { border-bottom: none; }

.facet-title {
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-faint);
  margin-bottom: 0.55rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}
.facet-title .facet-count {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--text-faint);
}
.facet-title::after {
  content: "▾";
  font-size: 0.7rem;
  transition: transform 0.15s;
}
.facet.collapsed .facet-title::after { transform: rotate(-90deg); }
.facet.collapsed .facet-values { display: none; }

.facet-values {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.facet-value {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.2rem 0.3rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-soft);
}
.facet-value:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.facet-value input[type="checkbox"] {
  margin: 0;
  accent-color: var(--text);
}
.facet-value .fv-count {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--text-faint);
}
.facet-value.is-zero { opacity: 0.35; }

/* ---- RESULTS ---- */
.banco-results-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.banco-count { color: var(--text-soft); }
.banco-count strong { color: var(--text); }
.banco-sort {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-faint);
}
.banco-sort select {
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
}

.banco-active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.banco-active-filters:empty { display: none; }
.active-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.55rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.78rem;
  color: var(--text);
  cursor: pointer;
}
.active-chip:hover { background: var(--bg-hover); }
.active-chip::after {
  content: "×";
  color: var(--text-faint);
  font-size: 0.9rem;
  line-height: 1;
}

.banco-empty {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--text-faint);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.banco-results {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.ej-card {
  display: block;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: all 0.15s;
  color: inherit;
}
.ej-card.in-cart {
  border-color: var(--text);
  box-shadow: inset 3px 0 0 var(--text);
}
.ej-card-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.8rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.ej-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-soft);
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.1s;
}
.ej-btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
  color: var(--text);
  opacity: 1;
}
.ej-btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.ej-btn-primary:hover {
  background: var(--text);
  color: var(--bg);
  opacity: 0.85;
}
.ej-btn-cart { margin-left: auto; }
.ej-btn-cart.is-added {
  background: var(--bg-subtle);
  color: var(--text);
  border-color: var(--text);
}

.cart-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.cart-badge {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 0.35rem;
  border-radius: 100px;
  background: var(--text);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
}
.ej-card-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
  align-items: baseline;
}
.ej-card-title {
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  line-height: 1.35;
}
.ej-card-puntos {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  white-space: nowrap;
}
.ej-card-meta {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-bottom: 0.6rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.ej-card-meta .sep::before { content: "·"; margin: 0 0.2rem; }
.ej-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.5rem;
}
.ej-tag {
  font-size: 0.72rem;
  padding: 0.12rem 0.45rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-soft);
  font-family: var(--mono);
}
.ej-tag[data-ns="dificultad"][data-val="facil"]   { color: #2d8b4f; border-color: #2d8b4f44; }
.ej-tag[data-ns="dificultad"][data-val="media"]   { color: #b88400; border-color: #b8840044; }
.ej-tag[data-ns="dificultad"][data-val="dificil"] { color: #c23a3a; border-color: #c23a3a44; }
.ej-tag[data-ns="descriptor_ib"] { color: var(--text); font-weight: 500; }