/* Learning exploration, transfer, and cross-device synchronization UI. */
.exploration-stage-card {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #f8fafc;
}

.exploration-stage-card:first-of-type {
  margin-top: 18px;
}

.learning-sync-panel {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  align-items: center;
  gap: 14px 18px;
  border: 1px solid #bfdbfe;
  border-left: 4px solid #2563eb;
  border-radius: 8px;
  background: #eff6ff;
  padding: 14px 16px;
}

.learning-sync-copy {
  display: grid;
  gap: 3px;
}

.learning-sync-copy strong {
  color: var(--ink);
  font-size: 16px;
}

.learning-sync-copy span {
  color: #334155;
  font-size: 14px;
  line-height: 1.55;
}

.learning-sync-form,
.learning-sync-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.learning-sync-form[hidden],
.learning-sync-actions[hidden] {
  display: none;
}

.learning-sync-form input {
  width: 160px;
  min-height: 38px;
  border: 1px solid #94a3b8;
  border-radius: 7px;
  background: #fff;
  padding: 7px 10px;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
}

.learning-sync-form input:focus {
  border-color: #2563eb;
  outline: 3px solid rgba(37, 99, 235, 0.16);
}

.exploration-stage-title,
.real-life-transfer h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.5;
  font-weight: 900;
}

.problem-note-block .exploration-stage-prompt {
  margin: 0 0 12px;
  color: #334155;
  font-size: 16px;
  line-height: 1.7;
}

.learning-response-input {
  display: block;
  width: 100%;
  min-height: 92px;
  resize: vertical;
  border: 1px solid #94a3b8;
  border-radius: 7px;
  background: #fff;
  padding: 11px 12px;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  line-height: 1.65;
  box-sizing: border-box;
}

.learning-response-input::placeholder {
  color: #64748b;
}

.learning-response-input:focus {
  outline: 3px solid rgba(37, 99, 235, 0.16);
  border-color: var(--brand);
}

.learning-response-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 10px;
}

.learning-primary-action,
.learning-secondary-action,
.animation-verify-action {
  min-height: 38px;
  border-radius: 7px;
  padding: 8px 13px;
  font: inherit;
  font-size: 14px;
  line-height: 1.35;
  font-weight: 800;
  cursor: pointer;
}

.learning-primary-action,
.animation-verify-action {
  border: 1px solid #1d4ed8;
  background: #2563eb;
  color: #fff;
}

.learning-secondary-action {
  border: 1px solid #cbd5e1;
  background: #fff;
  color: #334155;
}

.learning-primary-action:hover,
.animation-verify-action:hover {
  background: #1d4ed8;
}

.learning-secondary-action:hover {
  background: #f1f5f9;
}

.learning-primary-action:disabled {
  border-color: #cbd5e1;
  background: #e2e8f0;
  color: #64748b;
  cursor: not-allowed;
}

.exploration-feedback {
  margin-top: 14px;
  padding: 15px 16px;
  border-left: 4px solid #0f766e;
  border-radius: 0 7px 7px 0;
  background: #f0fdfa;
}

.exploration-feedback[hidden],
.learning-secondary-action[hidden] {
  display: none;
}

.exploration-feedback > p + p {
  margin-top: 8px;
}

.animation-verify-action {
  margin-top: 13px;
  border-color: #0f766e;
  background: #0f766e;
}

.animation-verify-action:hover {
  background: #115e59;
}

.problem-note-block .animation-verify-status {
  margin-top: 7px;
  color: #115e59;
  font-size: 14px;
  line-height: 1.55;
}

.real-life-videos {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.real-life-videos-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.real-life-videos-heading h3 {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.5;
  font-weight: 900;
}

.problem-note-block .real-life-videos-heading p {
  margin: 0;
  color: #475569;
  font-size: 14px;
  line-height: 1.55;
}

.real-life-video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.real-life-video-card {
  display: flex;
  min-width: 0;
  min-height: 190px;
  flex-direction: column;
  gap: 10px;
  border: 1px solid #cbd5e1;
  border-left: 4px solid #475569;
  border-radius: 8px;
  background: #fff;
  padding: 15px 16px;
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.real-life-video-card.is-bilibili {
  border-left-color: #e14b7b;
}

.real-life-video-card.is-youtube {
  border-left-color: #dc2626;
}

.real-life-video-card:hover,
.real-life-video-card:focus-visible {
  border-color: #94a3b8;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.09);
  transform: translateY(-1px);
}

.real-life-video-card:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.18);
  outline-offset: 2px;
}

.real-life-video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.real-life-video-platform {
  border-radius: 999px;
  background: #f1f5f9;
  padding: 4px 9px;
  color: #334155;
  font-size: 13px;
  line-height: 1.3;
  font-weight: 900;
}

.is-bilibili .real-life-video-platform {
  background: #fff1f5;
  color: #be285b;
}

.is-youtube .real-life-video-platform {
  background: #fef2f2;
  color: #b91c1c;
}

.real-life-video-duration {
  color: #64748b;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.real-life-video-title {
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
}

.problem-note-block .real-life-video-watch,
.problem-note-block .real-life-video-match {
  margin: 0;
  color: #334155;
  font-size: 14px;
  line-height: 1.6;
}

.problem-note-block .real-life-video-watch {
  display: grid;
  gap: 4px;
  border-radius: 7px;
  background: #f8fafc;
  padding: 9px 10px;
}

.real-life-video-watch b {
  color: #0f766e;
  font-size: 13px;
}

.problem-note-block .real-life-video-match {
  color: #64748b;
}

.real-life-video-action {
  margin-top: auto;
  color: var(--brand);
  font-size: 14px;
  font-weight: 900;
}

.real-life-transfer {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.real-life-transfer-question {
  margin-bottom: 12px;
}

.learning-save-status {
  color: #0f766e;
  font-size: 14px;
  font-weight: 700;
}

.real-life-answer {
  margin-top: 14px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #fff;
}

.real-life-answer > summary {
  padding: 12px 14px;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.45;
  font-weight: 900;
  cursor: pointer;
}

.real-life-answer[open] > summary {
  border-bottom: 1px solid var(--line);
}

.real-life-answer-body {
  padding: 14px 16px 16px;
}

.real-life-answer-body > p + p {
  margin-top: 8px;
}

.real-life-self-check {
  margin-top: 14px;
  border: 1px solid #99f6e4;
  border-radius: 8px;
  background: #f0fdfa;
  padding: 14px 16px;
}

.real-life-self-check[hidden] {
  display: none;
}

.real-life-self-check-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.real-life-self-check-heading strong {
  color: #134e4a;
  font-size: 16px;
}

.real-life-self-check-heading span {
  border-radius: 999px;
  background: #ccfbf1;
  padding: 3px 9px;
  color: #115e59;
  font-size: 13px;
  font-weight: 900;
}

.problem-note-block .real-life-self-check > p {
  margin: 6px 0 10px;
  color: #475569;
  font-size: 14px;
}

.real-life-self-check-list {
  display: grid;
  gap: 8px;
}

.real-life-self-check-list label {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  align-items: start;
  gap: 8px;
  border-radius: 6px;
  background: #fff;
  padding: 9px 10px;
  color: #1f2937;
  font-size: 15px;
  line-height: 1.6;
  cursor: pointer;
}

.real-life-self-check-list input {
  width: 17px;
  height: 17px;
  margin: 4px 0 0;
  accent-color: #0f766e;
}

@media (max-width: 720px) {
  .learning-sync-panel {
    grid-template-columns: 1fr;
  }

  .learning-sync-form,
  .learning-sync-actions {
    justify-content: flex-start;
  }

  .real-life-videos-heading {
    display: block;
  }

  .problem-note-block .real-life-videos-heading p {
    margin-top: 5px;
  }

  .real-life-video-grid {
    grid-template-columns: 1fr;
  }
}