/* ══ BTA Visual (CSV-20) ══════════════════════════════════════════════════════
   Mismo criterio de corrección visual que TOL/WCST/TMT/SDMT: .screen--center fija
   min-height:80vh, y con contenido más bajo que eso el bloque queda pegado arriba
   con un vacío debajo. El ritmo de presentación (1 s/ítem), la ventana de
   respuesta y la pausa entre secuencias no se tocan — solo se restila. */
.screen--bta-rsvp.screen--center,
.screen--bta-response.screen--center,
.screen--bta-transition.screen--center { min-height: calc(100vh - 42px); }
.screen--bta-rsvp, .screen--bta-response, .screen--bta-transition { width: 100%; max-width: 480px; }

.bta-panel { display: flex; flex-direction: column; align-items: center; gap: 22px; width: 100%; }
.bta-chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 7px 14px; border-radius: 100px;
  background: var(--surface); border: 1px solid var(--line);
  color: var(--ink-soft); font-size: .82rem; font-weight: 500;
  box-shadow: 0 1px 2px rgba(15, 30, 45, .05);
}
.bta-chip strong { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }

.bta-stim-card {
  display: flex; align-items: center; justify-content: center;
  min-width: 200px; min-height: 200px; padding: 24px 48px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(15, 30, 45, .08);
}
.bta-item {
  font-size: clamp(3rem, 12vw, 8rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .05em;
  line-height: 1;
}
.bta-rsvp-bar-track { width: 100%; max-width: 260px; height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; }
.bta-rsvp-bar { height: 100%; background: var(--accent); border-radius: 2px; transition: width 50ms linear; }

.bta-response-card {
  display: flex; flex-direction: column; align-items: center; gap: 20px; width: 100%;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(15, 30, 45, .08);
  padding: 30px 32px;
}
.bta-response-question { margin: 0; font-size: 1.1rem; color: var(--ink); }
.bta-input {
  width: 100%; max-width: 180px; padding: 10px 16px; font-size: 1.6rem;
  font-weight: 700; text-align: center; color: var(--ink);
  background: var(--paper); border: 2px solid var(--line);
  border-radius: var(--radius-sm); outline: none;
}
.bta-input:focus { border-color: var(--accent); }
.bta-resp-timer-track { width: 100%; max-width: 220px; height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; }
.bta-resp-timer { height: 100%; background: var(--danger); border-radius: 2px; transition: width 100ms linear; }

.bta-next-message { margin: 0; color: var(--ink-soft); font-size: 1.05rem; font-weight: 500; }