:root {
  --bg: #f4f8ff;
  --card: #ffffff;
  --primary: #1565c0;
  --primary-dark: #0d47a1;
  --ok: #2e7d32;
  --bad: #c62828;
  --text: #1a2b3c;
  --muted: #5f6f82;
  --line: #d7e4f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "PingFang TC", sans-serif;
  background: linear-gradient(180deg, #eef5ff, #f8fbff);
  color: var(--text);
}

.app {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 16px 14px 40px;
}

.hero {
  margin-bottom: 14px;
}

.badge {
  display: inline-block;
  margin: 0 0 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e3f2fd;
  color: var(--primary);
  font-size: 0.82rem;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.7rem;
}

.sub {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.95rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 8px 24px rgba(21, 101, 192, 0.08);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

.stat {
  background: #f7faff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
}

.stat span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.stat strong {
  font-size: 1.4rem;
  color: var(--primary);
}

.progress-wrap {
  margin-bottom: 12px;
}

.progress-bar {
  height: 10px;
  background: #e8f0fb;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar.thin {
  height: 6px;
  margin: 10px 0 14px;
}

.progress-bar > div {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #42a5f5, #1565c0);
  transition: width 0.25s ease;
}

.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.exam-format {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #f8fafc;
}

.exam-format-title {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.exam-format-list {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.exam-format-note {
  margin: 10px 0 0;
  font-size: 0.82rem;
}

.history {
  display: grid;
  gap: 8px;
  margin: 12px 0;
}

.history-item {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 0.9rem;
  border: 1px solid var(--line);
}

.history-item.pass {
  background: #edf7ed;
  border-color: #c8e6c9;
}

.history-item.fail {
  background: #ffebee;
  border-color: #ffcdd2;
}

button {
  border: none;
  border-radius: 10px;
  padding: 11px 14px;
  font: inherit;
  cursor: pointer;
}

.primary {
  background: var(--primary);
  color: #fff;
}

.primary:active {
  background: var(--primary-dark);
}

.secondary {
  background: #78909c;
  color: #fff;
}

.outline {
  background: #fff;
  color: var(--primary);
  border: 2px solid var(--primary);
}

#startBtn,
#resetBtn,
#refreshBtn {
  width: 100%;
  margin-top: 8px;
}

.version-line {
  text-align: center;
  margin-top: 10px;
  margin-bottom: 0;
  font-size: 0.82rem;
}

.hidden {
  display: none !important;
}

.quiz-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.round-label {
  margin: 0;
  font-weight: 700;
  color: var(--primary);
}

.score-live {
  text-align: right;
  font-size: 0.85rem;
  color: var(--muted);
}

.score-live strong {
  display: block;
  font-size: 1.4rem;
  color: var(--ok);
}

.question-box {
  min-height: 220px;
}

.topic {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 0.85rem;
}

#questionText {
  margin: 0 0 14px;
  line-height: 1.65;
  font-size: 1.05rem;
}

.answers {
  display: grid;
  gap: 10px;
}

.answer-btn {
  text-align: left;
  background: #f8fbff;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 12px;
}

.answer-btn.selected {
  border-color: var(--primary);
  background: #e3f2fd;
}

.answer-btn.correct {
  border-color: var(--ok);
  background: #c8e6c9;
  font-weight: 600;
}

.answer-btn.wrong {
  border-color: var(--bad);
  background: #ffcdd2;
  font-weight: 600;
}

.answer-btn:disabled {
  cursor: default;
  opacity: 1;
}

.answers-ms .answer-ms {
  font-family: inherit;
}

.ms-confirm-wrap {
  margin-top: 8px;
  display: grid;
  gap: 10px;
}

.ms-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.ms-confirm-btn {
  width: 100%;
}

.feedback-box {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.6;
}

.feedback-box.ok {
  background: #edf7ed;
  border: 1px solid #a5d6a7;
}

.feedback-box.bad {
  background: #ffebee;
  border: 1px solid #ef9a9a;
}

.feedback-box strong.title {
  display: block;
  margin-bottom: 6px;
  font-size: 1rem;
}

.feedback-box .source {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed rgba(0, 0, 0, 0.12);
  color: #2e5d32;
  font-weight: 600;
}

.quiz-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.quiz-actions button {
  flex: 1;
}

.score-big {
  margin: 4px 0;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
}

.result-msg {
  margin: 0 0 12px;
  line-height: 1.6;
}

.review-list {
  max-height: 320px;
  overflow: auto;
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 0.88rem;
  background: #fbfdff;
}

.review-item strong {
  color: var(--primary);
}

@media (max-width: 640px) {
  .stats {
    grid-template-columns: 1fr;
  }
}

/* ── 答題後記憶強化過場 ── */
.recap-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(10, 30, 60, 0.55);
  backdrop-filter: blur(4px);
  animation: recap-fade-in 0.35s ease;
}

.recap-card {
  width: min(520px, 100%);
  max-height: min(88vh, 640px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  animation: recap-slide-up 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.recap-header {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--line);
}

.recap-badge {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--primary);
  background: #e3f2fd;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.recap-progress-bar {
  height: 4px;
  background: #e8f0fb;
  border-radius: 999px;
  overflow: hidden;
}

.recap-progress-bar > div {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #66bb6a, #1565c0);
  transition: width 0.5s ease;
}

.recap-stage {
  flex: 1;
  overflow-y: auto;
  padding: 20px 18px;
  min-height: 280px;
}

.recap-step {
  animation: recap-step-in 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.recap-verdict {
  text-align: center;
  padding: 12px 0 8px;
}

.recap-verdict .icon {
  font-size: 3.2rem;
  line-height: 1;
  margin-bottom: 10px;
  animation: recap-pop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.recap-verdict.correct .icon {
  color: var(--ok);
}

.recap-verdict.wrong .icon {
  color: var(--bad);
  animation: recap-shake 0.6s ease both;
}

.recap-verdict h3 {
  margin: 0;
  font-size: 1.35rem;
}

.recap-verdict p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.recap-compare {
  display: grid;
  gap: 12px;
}

.recap-answer-card {
  border-radius: 12px;
  padding: 12px 14px;
  border: 2px solid var(--line);
  opacity: 0;
  transform: translateY(16px);
  animation: recap-card-in 0.5s ease forwards;
}

.recap-answer-card.yours {
  animation-delay: 0.1s;
}

.recap-answer-card.yours.wrong {
  border-color: #ef9a9a;
  background: #ffebee;
}

.recap-answer-card.yours.correct {
  border-color: #a5d6a7;
  background: #edf7ed;
}

.recap-answer-card.truth {
  border-color: #66bb6a;
  background: #c8e6c9;
  animation-delay: 0.55s;
}

.recap-answer-card.truth.only {
  animation-delay: 0.15s;
}

.recap-answer-card .label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}

.recap-answer-card .value {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
}

.recap-arrow {
  text-align: center;
  font-size: 1.4rem;
  color: var(--primary);
  opacity: 0;
  animation: recap-fade-in 0.4s ease 0.45s forwards;
}

.recap-cases h4,
.recap-memory h4 {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 1rem;
}

.case-slide {
  display: grid;
  gap: 10px;
}

.case-photo-wrap {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 2px solid var(--line);
  background: #eceff1;
  animation: recap-photo-in 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
  display: flex;
  justify-content: center;
}

.case-zoom-layer {
  position: relative;
  transform-origin: 50% 50%;
  transform: scale(1);
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
  width: 100%;
  display: flex;
  justify-content: center;
}

.case-image-frame {
  position: relative;
  max-width: 100%;
  line-height: 0;
}

.hotspot-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.case-photo {
  display: block;
  max-width: 100%;
  max-height: 240px;
}

.hotspot-box {
  position: absolute;
  border: 2px dashed rgba(198, 40, 40, 0.55);
  border-radius: 6px;
  box-sizing: border-box;
  opacity: 0;
  transition: opacity 0.4s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  pointer-events: none;
}

.hotspot-box.good {
  border-color: rgba(46, 125, 50, 0.55);
}

.hotspot-box.active {
  opacity: 1;
  border-style: solid;
  border-color: #c62828;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.28), 0 0 12px rgba(198, 40, 40, 0.8);
  animation: hotspot-flash 1.1s ease infinite;
}

.hotspot-box.good.active {
  border-color: #2e7d32;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.28), 0 0 12px rgba(46, 125, 50, 0.8);
}

.hotspot-box.dimmed {
  opacity: 0;
}

.hotspot-tag {
  position: absolute;
  top: -10px;
  left: -2px;
  transform: translateY(-100%) scale(0.5);
  transform-origin: left bottom;
  white-space: nowrap;
  background: #c62828;
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 8px;
}

.hotspot-box.good .hotspot-tag {
  background: #2e7d32;
}

.case-caption {
  position: absolute;
  left: 10px;
  bottom: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(198, 40, 40, 0.92);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  animation: recap-step-in 0.35s ease both;
}

.case-caption.good {
  background: rgba(46, 125, 50, 0.92);
}

.case-caption .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  animation: voice-pulse 1s ease infinite;
}

.case-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
}

.case-voice-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  background: #e3f2fd;
  border: 1px solid #90caf9;
  font-size: 0.85rem;
}

.case-voice-bar.muted {
  background: #f5f5f5;
  border-color: #e0e0e0;
}

.case-voice-bar.speaking .voice-pulse {
  animation: voice-pulse 1s ease infinite;
}

.voice-label {
  flex: 1;
  color: var(--primary);
  font-weight: 600;
}

.case-replay-btn {
  border: none;
  background: #fff;
  color: var(--primary);
  border-radius: 8px;
  padding: 6px 10px;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  border: 1px solid #90caf9;
}

.case-photo-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  text-align: center;
  background: #eceff1;
  color: var(--muted);
  font-size: 0.9rem;
}

.case-text {
  margin: 0;
  line-height: 1.65;
  font-size: 0.95rem;
  animation: recap-step-in 0.45s ease 0.2s both;
}

.case-credit {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.4;
}

.case-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 4px;
}

.case-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #cfd8dc;
}

.case-dot.active {
  background: var(--primary);
  transform: scale(1.2);
}

.recap-memory .explain {
  margin: 0 0 10px;
  line-height: 1.6;
  font-size: 0.94rem;
}

.recap-memory .source {
  padding: 10px 12px;
  background: #edf7ed;
  border-radius: 10px;
  color: #2e5d32;
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.5;
}

.recap-actions {
  display: flex;
  gap: 8px;
  padding: 12px 16px 16px;
  border-top: 1px solid var(--line);
}

.recap-actions button {
  flex: 1;
}

.recap-done-actions {
  display: flex;
  gap: 8px;
  flex: 1;
}

.recap-done-actions button {
  flex: 1;
}

.recap-skip {
  flex: 0 0 auto;
  min-width: 72px;
}

.quiz-panel-blocked {
  pointer-events: none;
  user-select: none;
}

@keyframes recap-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes recap-slide-up {
  from { opacity: 0; transform: translateY(32px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes recap-step-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes recap-pop {
  0% { transform: scale(0.3); opacity: 0; }
  70% { transform: scale(1.15); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes recap-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

@keyframes recap-card-in {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes recap-photo-in {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes voice-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.75; }
}

@keyframes hotspot-flash {
  0%, 100% { box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.28), 0 0 8px rgba(198, 40, 40, 0.6); }
  50% { box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.28), 0 0 18px rgba(198, 40, 40, 0.95); }
}