/* =============================================================
   Smart Shiksha — Class Multi-Select (Checkbox Dropdown)
   -------------------------------------------------------------
   Progressive enhancement over the native <select id="clas"
   multiple>. The native select stays in the DOM (hidden) as the
   data store so all existing JS ($('#clas').val(), change events,
   AJAX/PDF form building) keeps working untouched.

   Uses the report theme tokens (--rt-*) so light/dark mode and
   the Smart Shiksha Bootstrap design language are preserved.
   ============================================================= */

/* Hide the native select that powers the component */
select.rt-class-multi {
  display: none !important;
}

/* ---------- Wrapper ---------- */
.rt-cms {
  position: relative;
  flex: 0 1 auto;
  min-width: 0;
  width: 100%;
  max-width: 260px;
}

/* ---------- Closed-state trigger ---------- */
.rt-cms-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  min-height: 38px;
  padding: 0.375rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--rt-text, #0f172a);
  text-align: left;
  background: var(--rt-surface, #ffffff);
  border: 1px solid var(--rt-border, #e2e8f0);
  border-radius: var(--rt-radius-sm, 8px);
  cursor: pointer;
  user-select: none;
  transition: border-color var(--rt-transition, 0.18s ease), box-shadow var(--rt-transition, 0.18s ease), background var(--rt-transition, 0.18s ease);
}

.rt-cms-trigger:hover {
  border-color: var(--rt-primary, #2563eb);
}

.rt-cms-trigger:focus-visible {
  outline: none;
  border-color: var(--rt-primary, #2563eb);
  box-shadow: 0 0 0 3px var(--rt-primary-soft, rgba(37, 99, 235, 0.10));
}

.rt-cms-trigger-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--rt-muted, #64748b);
  font-weight: 600;
}

.rt-cms.has-selection .rt-cms-trigger-label {
  color: var(--rt-primary, #2563eb);
}

.rt-cms-trigger-caret {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--rt-muted, #64748b);
  transition: transform var(--rt-transition, 0.18s ease);
}

.rt-cms.open .rt-cms-trigger-caret {
  transform: rotate(180deg);
  color: var(--rt-primary, #2563eb);
}

/* ---------- Dropdown panel ---------- */
.rt-cms-panel {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 1050;
  display: none;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  background: var(--rt-surface, #ffffff);
  border: 1px solid var(--rt-border-strong, #cbd5e1);
  border-radius: var(--rt-radius, 12px);
  box-shadow: var(--rt-shadow-lg, 0 12px 28px rgba(15, 23, 42, 0.12));
  animation: rtCmsIn 0.16s ease both;
}

.rt-cms.open .rt-cms-panel {
  display: flex;
}

.rt-cms.rt-cms-up .rt-cms-panel {
  top: auto;
  bottom: calc(100% + 4px);
}

@keyframes rtCmsIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Search ---------- */
.rt-cms-search {
  position: relative;
  display: flex;
  align-items: center;
  padding: 0.6rem 0.6rem 0.4rem;
  border-bottom: 1px solid var(--rt-border, #e2e8f0);
}

.rt-cms-search > i {
  position: absolute;
  left: 1rem;
  font-size: 0.8rem;
  color: var(--rt-muted, #64748b);
  pointer-events: none;
}

.rt-cms-search-input {
  width: 100%;
  padding: 0.35rem 0.65rem 0.35rem 1.9rem;
  font-size: 0.83rem;
  color: var(--rt-text, #0f172a);
  background: var(--rt-surface-2, #f8fafc);
  border: 1px solid var(--rt-border, #e2e8f0);
  border-radius: var(--rt-radius-sm, 8px);
  outline: none;
  transition: border-color var(--rt-transition, 0.18s ease), box-shadow var(--rt-transition, 0.18s ease);
}

.rt-cms-search-input:focus {
  border-color: var(--rt-primary, #2563eb);
  box-shadow: 0 0 0 3px var(--rt-primary-soft, rgba(37, 99, 235, 0.10));
}

/* ---------- Action buttons (Select All / Deselect All / Clear) ---------- */
.rt-cms-actions {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--rt-border, #e2e8f0);
  flex-wrap: wrap;
}

.rt-cms-act {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem 0.6rem;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--rt-primary, #2563eb);
  background: var(--rt-primary-soft, rgba(37, 99, 235, 0.10));
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--rt-transition, 0.18s ease);
}

.rt-cms-act:hover {
  background: color-mix(in srgb, var(--rt-primary, #2563eb) 18%, transparent);
  transform: translateY(-1px);
}

/* ---------- Option list ---------- */
.rt-cms-list {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  padding: 0.35rem;
}

/* Slim custom scrollbar */
.rt-cms-list::-webkit-scrollbar {
  width: 8px;
}
.rt-cms-list::-webkit-scrollbar-track {
  background: transparent;
}
.rt-cms-list::-webkit-scrollbar-thumb {
  background: var(--rt-border-strong, #cbd5e1);
  border-radius: 999px;
}
.rt-cms-list::-webkit-scrollbar-thumb:hover {
  background: var(--rt-muted, #64748b);
}

.rt-cms-option {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 0.6rem;
  border-radius: var(--rt-radius-sm, 8px);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--rt-text, #0f172a);
  cursor: pointer;
  user-select: none;
  transition: background var(--rt-transition, 0.18s ease);
}

.rt-cms-option:hover {
  background: var(--rt-surface-2, #f8fafc);
}

.rt-cms-option input[type="checkbox"] {
  flex-shrink: 0;
  width: 15px;
  height: 15px;
  margin: 0;
  accent-color: var(--rt-primary, #2563eb);
  cursor: pointer;
}

.rt-cms-option-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rt-cms-option:has(input:checked) {
  background: var(--rt-primary-soft, rgba(37, 99, 235, 0.10));
  color: var(--rt-primary, #2563eb);
  font-weight: 600;
}

/* Fallback for browsers without :has() */
.rt-cms-option.checked {
  background: var(--rt-primary-soft, rgba(37, 99, 235, 0.10));
  color: var(--rt-primary, #2563eb);
  font-weight: 600;
}

/* ---------- Empty search state ---------- */
.rt-cms-empty {
  padding: 1.2rem 0.75rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--rt-muted, #64748b);
}

/* ---------- Dark mode refinements ---------- */
body.dark-mode .rt-cms-trigger,
body.dark-mode .rt-cms-panel,
[data-theme="dark"] .rt-cms-trigger,
[data-theme="dark"] .rt-cms-panel {
  background-color: var(--rt-surface, #1e293b);
}

body.dark-mode .rt-cms-search-input,
[data-theme="dark"] .rt-cms-search-input {
  background-color: var(--rt-surface-2, #172033);
  border-color: var(--rt-border, #334155);
  color: var(--rt-text, #e2e8f0);
}

body.dark-mode .rt-cms-option:hover,
[data-theme="dark"] .rt-cms-option:hover {
  background: rgba(148, 163, 184, 0.08);
}

/* ---------- Responsive ---------- */
@media (max-width: 767.98px) {
  .rt-cms {
    flex: 1 1 auto;
    max-width: none;
  }
}

@media (max-width: 575.98px) {
  .rt-cms-panel {
    min-width: 0;
  }
  .rt-cms-act {
    flex: 1 1 auto;
    justify-content: center;
  }
}

/* ---------- Print ---------- */
@media print {
  .rt-cms-trigger,
  .rt-cms-panel {
    display: none !important;
  }
}