/* ============================================================================
   LIF Trainer Lab — vista del constructor de filtros
   ============================================================================ */

.trainer-filters {
  max-width: 920px;
}

/* -------- Header -------------------------------------------------------- */
.trainer-filters__header {
  margin-bottom: 24px;
}

.trainer-filters__back {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-soft);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  transition: var(--transition);
}

.trainer-filters__back:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.trainer-filters__title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: .4px;
  margin: 0 0 6px;
  color: var(--text);
}

.trainer-filters__subtitle {
  font-size: 13px;
  color: var(--text-soft);
  margin: 0;
}

/* -------- Grupos de chips ----------------------------------------------- */
.trainer-filters__groups {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 18px;
}

/* El último chip-group dentro del panel sin margen para que no quede aire */
.trainer-filters__groups .chip-group:last-child {
  margin-bottom: 0;
}

/* -------- Footer (contador + CTA) --------------------------------------- */
.trainer-filters__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);

  /* Sticky — el footer queda visible cuando el alumno scrollea entre filtros */
  position: sticky;
  bottom: 16px;
  backdrop-filter: blur(8px);
}

.trainer-filters__counter {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.trainer-filters__counter-num {
  font-size: 26px;
  font-weight: 500;
  color: var(--text);
  line-height: 1;
}

.trainer-filters__counter-num--stale {
  opacity: .55;
}

.trainer-filters__counter-text {
  font-size: 13px;
  color: var(--text-soft);
  margin-left: 4px;
}

.trainer-filters__counter-text--muted {
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
}

.trainer-filters__counter-hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.trainer-filters__counter-alert {
  color: #f59e0b;
  margin-left: 6px;
  font-size: 14px;
  cursor: help;
}

/* -------- Botón "Ver sesión" -------------------------------------------- */
.trainer-filters__proceed {
  background: var(--primary);
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  color: white;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  transition: var(--transition);
  letter-spacing: .3px;
  white-space: nowrap;
}

.trainer-filters__proceed:hover:not(:disabled) {
  background: var(--primary-strong, var(--primary));
  transform: translateY(-1px);
  box-shadow: var(--shadow-1);
}

.trainer-filters__proceed:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.trainer-filters__proceed:disabled {
  background: var(--line-strong);
  border-color: var(--line-strong);
  color: var(--muted);
  cursor: not-allowed;
}

/* -------- Mobile -------------------------------------------------------- */
@media (max-width: 720px) {
  .trainer-filters__groups {
    padding: 18px 16px;
  }
  .trainer-filters__footer {
    padding: 12px 16px;
    flex-wrap: wrap;
  }
  .trainer-filters__counter-num {
    font-size: 22px;
  }
  .trainer-filters__proceed {
    font-size: 13px;
    padding: 9px 18px;
  }
}