/* LRUD Spatial Listening */

.lrud-shell {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lrud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.lrud-title-wrap h1 {
  font-size: 1.05rem;
  margin: 0;
}

.lrud-title-wrap p {
  color: var(--text-secondary);
  font-size: 0.76rem;
  margin-top: 0.2rem;
}

.lrud-evidence-badge {
  font: 700 0.62rem var(--font-mono);
  color: var(--amber-warning);
  border: 1px solid var(--warning);
  background: var(--warning-soft);
  border-radius: 9999px;
  padding: 0.25rem 0.55rem;
  white-space: nowrap;
}

.lrud-setup,
.lrud-session,
.lrud-results {
  border: 1px solid var(--border-subtle);
  border-radius: 0.85rem;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
}

.lrud-setup,
.lrud-results {
  padding: 0.9rem;
}

.lrud-preset-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
}

.lrud-preset {
  border: 1px solid var(--border-subtle);
  background: var(--surface-overlay);
  color: var(--text-secondary);
  border-radius: 0.65rem;
  padding: 0.75rem;
  text-align: left;
  cursor: pointer;
}

.lrud-preset.active {
  color: var(--accent-strong);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.lrud-preset strong,
.lrud-preset span {
  display: block;
}

.lrud-preset span {
  margin-top: 0.2rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.lrud-settings {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin-top: 0.7rem;
}

.lrud-custom-settings {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin-top: 0.7rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border-subtle);
}

.lrud-gap-setting {
  grid-column: span 2;
}

.lrud-setting-hint {
  color: var(--text-muted);
  font-size: 0.65rem;
  line-height: 1.35;
}

.lrud-setting {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.lrud-setting label {
  font: 700 0.63rem var(--font-mono);
  color: var(--text-secondary);
}

.lrud-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.lrud-session {
  position: relative;
  min-height: 32rem;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  touch-action: none;
  user-select: none;
  overscroll-behavior: none;
}

.lrud-session-topbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.6rem;
}

.lrud-session-preview .lrud-session-topbar,
.lrud-session-preview .lrud-answer-actions {
  visibility: hidden;
  pointer-events: none;
}

.lrud-session-preview {
  touch-action: pan-y;
  user-select: auto;
}

.lrud-progress {
  text-align: center;
  font: 700 0.72rem var(--font-mono);
  color: var(--text-secondary);
}

.lrud-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 0;
}

.lrud-listening,
.lrud-answer-stage,
.lrud-sum-stage {
  width: min(100%, 31rem);
  text-align: center;
}

.lrud-listening {
  position: relative;
  flex: 0 0 2.2rem;
  height: 2.2rem;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}

.lrud-listening.is-active {
  visibility: visible;
  opacity: 1;
}

.lrud-stage.is-sum .lrud-listening {
  display: none;
}

.lrud-stage-label {
  font: 800 0.78rem var(--font-hud);
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.lrud-debug-transcript {
  margin-top: 0.25rem;
  font: 700 0.72rem var(--font-mono);
  color: var(--amber-warning);
}

.lrud-grid {
  width: min(82vw, 25rem);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 0.22rem;
}

.lrud-cell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-width: 0;
  min-height: 0;
  border: 1px solid var(--border-strong);
  border-radius: 0.45rem;
  overflow: hidden;
  background: var(--surface-overlay);
}

.lrud-half {
  appearance: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  min-width: 0;
  min-height: 0;
}

.lrud-half:first-child {
  border-right: 1px dashed var(--border-default);
}

.lrud-half:hover,
.lrud-half:focus-visible {
  background: var(--accent-soft);
  outline: none;
}

.lrud-half:disabled {
  cursor: default;
}

.lrud-half:disabled:hover {
  background: transparent;
}

/* Press confirmation.

   The flash says which half was pressed and then removes itself completely: the
   drill must never show which halves were already chosen, or the grid turns
   into a memory aid. Nothing here leaves a resting state -- the animation ends
   on transparent, and the class is stripped on animationend, on a fallback
   timer, and again whenever input reopens for the next question.

   It is declared after :disabled:hover because the half is disabled the instant
   the answer is submitted, and the flash still has to be visible. */
@keyframes lrud-pick-flash {
  0% {
    background: var(--accent);
    box-shadow: inset 0 0 0 2px var(--accent);
  }
  55% {
    background: var(--accent-soft);
    box-shadow: inset 0 0 0 2px var(--accent-soft);
  }
  100% {
    background: transparent;
    box-shadow: inset 0 0 0 2px transparent;
  }
}

.lrud-half.is-picked,
.lrud-half.is-picked:disabled,
.lrud-half.is-picked:disabled:hover {
  animation: lrud-pick-flash 420ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  /* Still confirms the press -- a colour fade is not motion -- just briefer. */
  .lrud-half.is-picked,
  .lrud-half.is-picked:disabled,
  .lrud-half.is-picked:disabled:hover {
    animation-duration: 200ms;
  }
}

.lrud-answer-actions button:disabled {
  cursor: default;
  opacity: 0.55;
}

.lrud-answer-actions {
  display: flex;
  justify-content: center;
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.lrud-feedback {
  margin-top: 0.65rem;
  padding: 0.55rem 0.7rem;
  border-radius: 0.55rem;
  font-size: 0.75rem;
  text-align: left;
  background: var(--surface-overlay);
  border: 1px solid var(--border-subtle);
}

.lrud-feedback.correct { border-color: var(--success); color: var(--emerald-success); }
.lrud-feedback.wrong { border-color: var(--danger); color: var(--rose-danger); }

.lrud-trace {
  margin-top: 0.45rem;
  font: 600 0.68rem var(--font-mono);
  color: var(--text-secondary);
  white-space: pre-line;
}

.lrud-sum-value {
  font: 800 2.5rem var(--font-hud);
  margin: 0.8rem 0;
}

.lrud-sum-timer {
  width: fit-content;
  min-width: 3.8rem;
  margin: 0.55rem auto 0;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--warning);
  border-radius: 9999px;
  color: var(--amber-warning);
  font: 800 0.75rem var(--font-mono);
}

.lrud-sum-form {
  display: flex;
  justify-content: center;
  gap: 0.45rem;
}

.lrud-sum-input {
  width: 10rem;
  border: 1px solid var(--border-subtle);
  border-radius: 0.5rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  font: 800 1.15rem var(--font-mono);
  text-align: center;
  padding: 0.55rem;
}

.lrud-result-score {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
}

.lrud-score-card {
  padding: 0.75rem;
  border-radius: 0.65rem;
  background: var(--surface-overlay);
  border: 1px solid var(--border-subtle);
  text-align: center;
}

.lrud-score-card strong {
  display: block;
  font: 800 1.35rem var(--font-hud);
  color: var(--sky-accent);
}

.lrud-score-card span {
  font-size: 0.68rem;
  color: var(--text-secondary);
}

.lrud-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.lrud-metric {
  padding: 0.55rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-subtle);
  font-size: 0.68rem;
  color: var(--text-secondary);
}

.lrud-metric strong {
  display: block;
  margin-top: 0.15rem;
  color: var(--text-primary);
  font: 700 0.9rem var(--font-mono);
}

@media (max-width: 900px) {
  .lrud-preset-grid,
  .lrud-settings,
  .lrud-custom-settings { grid-template-columns: 1fr; }

  .lrud-gap-setting { grid-column: auto; }

  body.lrud-session-active {
    overflow: hidden !important;
    overscroll-behavior: none;
  }

  body.lrud-session-active .lrud-session {
    position: fixed;
    inset: 0;
    z-index: 3000;
    width: 100vw;
    height: 100dvh;
    min-height: 0;
    border-radius: 0;
    padding: max(0.7rem, env(safe-area-inset-top)) max(0.7rem, env(safe-area-inset-right)) max(0.7rem, env(safe-area-inset-bottom)) max(0.7rem, env(safe-area-inset-left));
    background: var(--bg-main);
  }

  .lrud-grid {
    width: min(88vw, 54vh);
  }
}

@media (max-width: 560px) {
  .lrud-header { align-items: flex-start; flex-direction: column; }
  .lrud-result-score { grid-template-columns: 1fr; }
  .lrud-metrics { grid-template-columns: repeat(2, 1fr); }
}