/* ==========================================================================
   Curriculum Hub — sidebar (master-detail) layout.
   Pairs with curriculum-sidebar.js. Uses the hub's existing CSS variables so
   it adapts to dark/light theme. Falls back gracefully if JS doesn't run.
   ========================================================================== */
.curr-shell {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

/* Left rail of units */
.curr-rail {
  position: sticky;
  top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: calc(100vh - 24px);
  overflow-y: auto;
  padding-right: 2px;
}
.curr-rail-item {
  appearance: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  background: var(--card, rgba(255, 255, 255, 0.02));
  border-radius: 10px;
  cursor: pointer;
  color: var(--ink);
  font-family: inherit;
  transition:
    border-color 0.15s,
    background 0.15s,
    transform 0.1s;
}
.curr-rail-item:hover,
.curr-rail-item:focus-visible {
  border-color: var(--teal);
  outline: none;
  transform: translateX(2px);
}
.curr-rail-item[aria-current="true"] {
  border-color: var(--teal);
  background: var(--teal-light, rgba(45, 212, 191, 0.12));
}
.curr-rail-item[aria-current="true"] .cri-num {
  color: var(--teal);
}
.cri-num {
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: 0.01em;
}
.cri-name {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

/* Detail mode: one unit at a time, full width */
.curr-shell .units-grid {
  grid-template-columns: minmax(0, 1fr) !important;
  gap: 16px;
}
.curr-detail-mode .unit-card:not(.curr-active) {
  display: none;
}

/* Browse mode (search/filter active): restore the multi-column grid so every
   matching unit shows. */
.curr-browse-mode .units-grid {
  grid-template-columns: repeat(
    auto-fill,
    minmax(min(100%, 420px), 1fr)
  ) !important;
}
.curr-browse-mode .unit-card {
  display: block;
}

/* Responsive: rail becomes a horizontal wrap above the content */
@media (max-width: 820px) {
  .curr-shell {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .curr-rail {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    max-height: none;
    overflow: visible;
  }
  .curr-rail-item {
    flex: 1 1 130px;
  }
  .curr-rail-item .cri-name {
    display: none;
  }
}

@media print {
  .curr-rail {
    display: none !important;
  }
  .curr-detail-mode .unit-card {
    display: block !important;
  }
}