/* Three-question explanation rehearsal module. */

.explanation-panel,
.explanation-setup,
.explanation-question,
.explanation-results {
  width: 100%;
  min-width: 0;
}

.explanation-panel {
  display: grid;
  gap: 16px;
  grid-template-rows: auto auto minmax(0, 1fr);
  align-content: start;
}

.explanation-panel[hidden],
.explanation-setup[hidden],
.explanation-question[hidden],
.explanation-results[hidden] {
  display: none;
}

.explanation-setup,
.explanation-question,
.explanation-results {
  display: grid;
  gap: 14px;
  align-content: start;
}

.explanation-hero {
  width: 100%;
  min-width: 0;
  aspect-ratio: 16 / 9;
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.explanation-hero img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
}

.explanation-card,
.explanation-announcer,
.explanation-question-card,
.explanation-result-heading,
.explanation-result-card {
  border: 1px solid var(--hairline);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.explanation-card {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.explanation-card h2,
.explanation-result-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: 23px;
  line-height: 1.35;
  word-break: keep-all;
}

.explanation-mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.explanation-mode {
  min-height: 112px;
  border: 3px solid var(--ink);
  border-radius: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 14px;
  display: grid;
  align-content: center;
  gap: 6px;
  text-align: left;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 100ms ease, box-shadow 100ms ease, background 100ms ease;
}

.explanation-mode.active {
  background: color-mix(in srgb, var(--primary) 15%, var(--surface));
}

.explanation-mode strong {
  font-size: 16px;
  line-height: 1.3;
}

.explanation-mode small {
  color: var(--ink-muted);
  line-height: 1.45;
}

.explanation-mode:hover,
.explanation-start:hover,
.explanation-confirm:hover:not(:disabled),
.explanation-results .button-primary:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 var(--ink);
}

.explanation-mode:active,
.explanation-start:active,
.explanation-confirm:active,
.explanation-results .button-primary:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.explanation-notice {
  display: grid;
  gap: 6px;
}

.explanation-notice p {
  margin: 0;
}

.explanation-start,
.explanation-confirm,
.explanation-results .button-primary {
  width: 100%;
  min-height: 56px;
  border: 3px solid var(--ink);
  border-radius: 0;
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 18px;
  font-weight: 900;
  transition: transform 100ms ease, box-shadow 100ms ease, background 100ms ease;
}

.explanation-announcer {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.explanation-announcer-avatar {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--primary) 18%, var(--surface));
  color: var(--primary);
  font-size: 20px;
  font-weight: 950;
}

.explanation-announcer > div:last-child {
  display: grid;
  gap: 2px;
}

.explanation-announcer strong {
  color: var(--ink);
  font-size: 18px;
}

.explanation-question-card {
  display: grid;
  gap: 9px;
  padding: 18px;
}

.explanation-question-card p {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  font-weight: 850;
  line-height: 1.5;
  word-break: keep-all;
}

.explanation-media {
  position: relative;
  min-height: 245px;
  border: 1px solid var(--hairline);
  border-radius: 24px;
  background: #101722;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.explanation-media video {
  width: 100%;
  height: 100%;
  min-height: 245px;
  display: block;
  object-fit: cover;
  transform: scaleX(-1);
}

.explanation-media video[hidden],
.explanation-audio-visual[hidden] {
  display: none;
}

.explanation-audio-visual {
  min-height: 245px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 7px;
}

.explanation-audio-visual span,
.explanation-audio-visual i {
  width: 8px;
  height: 44px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--primary) 74%, white);
  transform: scaleY(.45);
}

.explanation-media.is-recording .explanation-audio-visual span,
.explanation-media.is-recording .explanation-audio-visual i {
  animation: explanation-wave 760ms ease-in-out infinite alternate;
}

.explanation-media.is-recording .explanation-audio-visual i:nth-child(2) {
  animation-delay: 110ms;
}

.explanation-media.is-recording .explanation-audio-visual i:nth-child(3) {
  animation-delay: 220ms;
}

.explanation-media.is-recording .explanation-audio-visual i:nth-child(4) {
  animation-delay: 330ms;
}

.explanation-countdown {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  background: rgb(7 14 24 / 76%);
  color: white;
  font-size: 84px;
  font-weight: 950;
}

.explanation-countdown[hidden] {
  display: none;
}

.explanation-timer {
  position: absolute;
  right: 12px;
  bottom: 12px;
  min-width: 102px;
  border: 1px solid rgb(255 255 255 / 24%);
  border-radius: 14px;
  background: rgb(6 12 20 / 82%);
  color: white;
  padding: 8px 10px;
  display: grid;
  gap: 2px;
  text-align: right;
}

.explanation-timer span {
  color: rgb(255 255 255 / 70%);
  font-size: 11px;
  font-weight: 700;
}

.explanation-timer strong {
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}

.explanation-media.time-warning .explanation-timer {
  border-color: color-mix(in srgb, var(--primary) 78%, white);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}

.explanation-status {
  min-height: 24px;
  margin: 0;
  color: var(--ink-secondary);
  text-align: center;
  font-weight: 750;
}

.explanation-result-heading {
  display: grid;
  gap: 8px;
  padding: 18px;
}

.explanation-result-heading p {
  margin: 0;
  color: var(--ink-muted);
  line-height: 1.55;
}

.explanation-result-list {
  display: grid;
  gap: 14px;
}

.explanation-result-card {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.explanation-result-question {
  display: grid;
  gap: 7px;
}

.explanation-result-question strong {
  color: var(--ink);
  font-size: 18px;
  line-height: 1.5;
}

.explanation-result-question small {
  color: var(--ink-muted);
}

.explanation-result-media video,
.explanation-result-media audio {
  width: 100%;
  display: block;
  border-radius: 16px;
  background: #101722;
}

.explanation-result-media video {
  max-height: 320px;
}

.explanation-result-transcript {
  display: grid;
  gap: 8px;
  color: var(--ink-secondary);
  font-weight: 800;
}

.explanation-result-transcript textarea {
  width: 100%;
  min-height: 108px;
  resize: vertical;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  background: var(--canvas-soft);
  color: var(--ink);
  padding: 12px;
  font: inherit;
  line-height: 1.55;
}

.explanation-result-transcript textarea:focus {
  outline: 3px solid color-mix(in srgb, var(--primary) 34%, transparent);
  border-color: var(--primary);
}

.explanation-guide-points {
  border-radius: 14px;
  background: color-mix(in srgb, var(--primary) 8%, var(--surface));
  padding: 12px;
  display: grid;
  gap: 8px;
}

.explanation-guide-points strong {
  color: var(--ink-secondary);
}

.explanation-guide-points ul {
  margin: 0;
  padding-left: 20px;
  color: var(--ink);
  line-height: 1.55;
}

@keyframes explanation-wave {
  from { transform: scaleY(.35); }
  to { transform: scaleY(1); }
}

@media (max-width: 420px) {
  .explanation-mode-grid {
    grid-template-columns: 1fr;
  }

  .explanation-mode {
    min-height: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .explanation-media.is-recording .explanation-audio-visual span,
  .explanation-media.is-recording .explanation-audio-visual i {
    animation: none;
    transform: scaleY(.72);
  }
}