:root {
  --bg: #0f1420;
  --card: #1a2233;
  --card2: #212c42;
  --accent: #ff7a45;
  --accent2: #5fd0ff;
  --text: #eef1f7;
  --text-dim: #b4bed0;
  --ok: #5fd67d;
  --bad: #ff5f6d;
  --radius: 16px;
  --font-scale: 1;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f6fb;
    --card: #ffffff;
    --card2: #eef1f8;
    --text: #1b2436;
    --text-dim: #5b6478;
  }
  :root:not([data-theme="dark"]) .explain-box { background: #eef1f8; }
  :root:not([data-theme="dark"]) .cert-form input { background: #fff; border-color: #ccd3e0; }
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  min-height: 100vh;
}
#app { max-width: 900px; margin: 0 auto; padding: 24px 16px 80px; }

.header {
  text-align: center; padding: 24px 0 8px;
}
.header h1 { font-size: 1.6rem; margin: 0 0 6px; }
.header p { color: var(--text-dim); margin: 0; font-size: 0.95rem; }
.header .est-time { margin-top: 6px; font-size: 0.85rem; }
.toolbar { display: flex; justify-content: center; gap: 8px; margin-top: 10px; }
.toolbar button {
  background: var(--card2); color: var(--text); border: 1px solid #334; border-radius: 8px;
  padding: 4px 10px; font-size: 0.85rem; cursor: pointer;
}
.disclaimer-banner {
  background: #241a10; border: 1px solid #6b4a20; color: #e8c99a;
  border-radius: 12px; padding: 10px 14px; font-size: 0.85rem; line-height: 1.6; margin-bottom: 12px;
}
.group-header {
  grid-column: 1 / -1; margin: 14px 0 2px; font-weight: 700; color: var(--accent2); font-size: 0.9rem;
}
.group-header:first-child { margin-top: 0; }
.progress-text { text-align: center; color: var(--text-dim); font-size: 0.85rem; margin: -20px 0 16px; }
.milestone-banner {
  text-align: center; background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #14202f; font-weight: 700; padding: 10px; border-radius: 12px; margin-bottom: 16px;
}
.pass-hint { color: var(--text-dim); font-size: 0.85rem; margin-top: 8px; }

.progress-bar-wrap {
  background: var(--card); border-radius: 999px; height: 10px; overflow: hidden; margin: 16px 0 28px;
}
.progress-bar-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .3s ease;
}

.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px;
}
.stage-card {
  background: var(--card); border-radius: var(--radius); padding: 18px 14px;
  cursor: pointer; border: 2px solid transparent; transition: transform .15s, border-color .15s;
  display: flex; flex-direction: column; gap: 6px; position: relative;
}
.stage-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.stage-card:active { transform: scale(.97); }
.stage-card.locked { opacity: .4; cursor: not-allowed; }
.stage-card.locked:hover { transform: none; border-color: transparent; }
.stage-card.locked:active { transform: none; }
.stage-card.passed { border-color: var(--ok); }
.stage-card.resume { border-color: var(--accent2); box-shadow: 0 0 0 3px rgba(95,208,255,.2); }
.stage-icon { font-size: 1.8rem; }
.stage-title { font-weight: 600; font-size: 0.98rem; }
.stage-status { font-size: 0.78rem; color: var(--text-dim); }
.badge-done {
  position: absolute; top: 10px; right: 10px; background: var(--ok); color: #06210f;
  font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
  animation: bounce-in .35s ease;
}
@keyframes bounce-in {
  0% { transform: scale(0); } 60% { transform: scale(1.15); } 100% { transform: scale(1); }
}
.badge-resume {
  position: absolute; top: 10px; right: 10px; background: var(--accent2); color: #06210f;
  font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
}

.panel {
  background: var(--card); border-radius: var(--radius); padding: 22px; margin-top: 18px;
}
.reading-text { line-height: 1.9; font-size: calc(1rem * var(--font-scale)); color: var(--text); white-space: pre-wrap; }
.reading-image { display: block; width: 100%; max-width: 100%; height: auto; border-radius: 12px; margin-bottom: 18px; }
.objective-box {
  background: #12291f; border-left: 3px solid var(--ok); border-radius: 8px;
  padding: 10px 14px; margin-bottom: 14px; font-size: 0.92rem; color: #cdeed9;
}
.resources-box {
  background: #2a1420; border: 1px solid #6b2a3a; border-radius: 12px;
  padding: 14px 16px; margin-top: 16px; font-size: 0.9rem; line-height: 1.7; color: #f3c9d4;
}
.resources-box strong { color: #ff8fa3; }
.empathy-hint {
  background: #241a10; border-left: 3px solid var(--accent); border-radius: 8px;
  padding: 8px 14px; margin-bottom: 14px; font-size: 0.88rem; color: #e8c99a;
}
.confidence-box { margin-top: 16px; }
.confidence-box .scale { display: flex; gap: 8px; margin-top: 6px; }
.confidence-box button {
  flex: 1; background: var(--card2); color: var(--text); border: 1px solid #334;
  border-radius: 8px; padding: 8px; cursor: pointer; font-size: 0.9rem;
}
.confidence-box button.selected { border-color: var(--accent2); background: #12324a; }
.wrong-review { text-align: left; margin-top: 16px; }
.wrong-review .wq-item {
  background: var(--card2); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; font-size: 0.88rem;
}
.tts-btn {
  background: var(--card2); color: var(--text); border: 1px solid #334; border-radius: 8px;
  padding: 6px 12px; font-size: 0.85rem; cursor: pointer; margin-bottom: 12px;
}
.btn {
  display: inline-block; background: var(--accent); color: #201200; font-weight: 700;
  border: none; border-radius: 10px; padding: 12px 22px; font-size: 1rem; cursor: pointer;
  margin-top: 18px; transition: transform .1s ease;
}
.btn:active { transform: scale(.96); }
.btn.secondary { background: var(--card2); color: var(--text); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.q-progress { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 8px; }
.q-text { font-size: 1.12rem; font-weight: 600; margin-bottom: 16px; line-height: 1.6; }
.option {
  display: block; width: 100%; text-align: left; background: var(--card2); color: var(--text);
  border: 2px solid transparent; border-radius: 12px; padding: 14px 16px; margin-bottom: 10px;
  cursor: pointer; font-size: 0.98rem; line-height: 1.5;
}
.option:hover { border-color: var(--accent2); }
.option.correct { border-color: var(--ok); background: #163825; animation: pulse-correct .4s ease; }
.option.wrong { border-color: var(--bad); background: #3a1a1d; animation: shake-wrong .4s ease; }
.option.disabled { pointer-events: none; }

@keyframes pulse-correct {
  0% { transform: scale(1); }
  40% { transform: scale(1.03); }
  100% { transform: scale(1); }
}
@keyframes shake-wrong {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
.explain-box {
  margin-top: 14px; padding: 14px; border-radius: 12px; background: #10182a;
  font-size: 0.92rem; color: var(--text-dim); border-left: 3px solid var(--accent2);
}

.result-score { font-size: 2.4rem; font-weight: 800; text-align: center; margin: 12px 0; }
.result-msg { text-align: center; color: var(--text-dim); margin-bottom: 20px; }
.pass { color: var(--ok); }
.fail { color: var(--bad); }

.cert-form input {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid #334;
  background: #0d1322; color: var(--text); font-size: 1rem; margin-bottom: 12px;
}
.cert-canvas-wrap { text-align: center; margin-top: 16px; }
#certCanvas { max-width: 100%; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,.4); }

.footer-nav { display: flex; justify-content: space-between; margin-top: 20px; }

.xp-display {
  margin-top: 10px; font-size: 0.95rem; color: var(--accent2); font-weight: 700;
}

.diff-badge { font-size: 0.72rem; font-weight: 500; color: var(--text-dim); }

.badge-wall { margin: 18px 0; }
.badge-wall-title { font-weight: 700; font-size: 0.9rem; margin-bottom: 8px; color: var(--text-dim); }
.badge-wall-items { display: flex; flex-wrap: wrap; gap: 10px; }
.badge-chip {
  display: flex; align-items: center; gap: 6px; background: var(--card); border-radius: 999px;
  padding: 6px 14px; font-size: 0.85rem; border: 1px solid transparent;
}
.badge-chip.unlocked { border-color: var(--ok); color: var(--text); }
.badge-chip.locked { color: var(--text-dim); opacity: .55; }
.badge-chip-icon { font-size: 1rem; }

.group-rings-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin: 18px 0;
}
.group-ring { display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; }
.group-ring-circle {
  width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
}
.group-ring.ring-mini .group-ring-circle { width: 34px; height: 34px; }
.group-ring-inner {
  width: 42px; height: 42px; border-radius: 50%; background: var(--card); color: var(--text);
  display: flex; align-items: center; justify-content: center; font-size: 0.65rem; font-weight: 700;
}
.group-ring.ring-mini .group-ring-inner { width: 26px; height: 26px; font-size: 0.55rem; }
.group-ring-label { font-size: 0.68rem; color: var(--text-dim); text-align: center; max-width: 70px; }

.accordion-wrap { display: flex; flex-direction: column; gap: 10px; }
.group-accordion { background: var(--card); border-radius: var(--radius); overflow: hidden; }
.group-accordion-header {
  display: flex; align-items: center; gap: 10px; padding: 14px 16px; cursor: pointer;
  font-weight: 700; color: var(--accent2);
}
.group-accordion-arrow { font-size: 0.75rem; width: 14px; }
.group-accordion-title { flex: 1; }
.group-accordion-count { font-size: 0.85rem; color: var(--text-dim); font-weight: 500; }
.group-accordion-body { padding: 4px 14px 16px; }
.group-accordion-body.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }

.dot-progress { display: flex; gap: 6px; margin-bottom: 12px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--card2); display: inline-block; }
.dot-correct { background: var(--ok); }
.dot-wrong { background: var(--bad); }
.dot-current { background: var(--accent2); }
.dot-pending { background: var(--card2); border: 1px solid #334; }
.streak-hint {
  margin-top: 10px; padding: 8px 12px; border-radius: 8px; background: #12324a; color: var(--accent2);
  font-size: 0.85rem;
}

.classroom-activity-box {
  background: #12291f; border: 1px solid #2c5c44; border-radius: 12px;
  padding: 12px 16px; margin-top: 16px; font-size: 0.9rem; line-height: 1.7; color: #cdeed9;
}

.export-import-panel { margin-top: 24px; font-size: 0.85rem; color: var(--text-dim); }
.export-import-panel summary { cursor: pointer; padding: 6px 0; }
.export-import-panel .ei-body { margin-top: 10px; }
.export-import-panel textarea {
  background: #0d1322; color: var(--text); border: 1px solid #334; border-radius: 8px; padding: 8px; font-size: 0.8rem;
}

.ceremony-checks {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin: 22px 0;
}
.ceremony-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px; opacity: 0; animation: ceremony-in .5s ease forwards;
  background: var(--card2); border-radius: 12px; padding: 12px 16px; min-width: 96px;
}
.ceremony-icon { font-size: 0.85rem; color: var(--text-dim); }
.ceremony-tick { font-size: 1.4rem; color: var(--ok); font-weight: 800; }
@keyframes ceremony-in {
  0% { opacity: 0; transform: translateY(8px) scale(.9); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.history-groups { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.history-row {
  display: flex; justify-content: space-between; gap: 10px; background: var(--card2);
  border-radius: 8px; padding: 8px 12px; font-size: 0.88rem;
}
.history-struggled { margin-top: 14px; text-align: left; }

@media (max-width: 480px) {
  .grid, .group-accordion-body.grid { grid-template-columns: 1fr; }
  .header h1 { font-size: 1.3rem; }
  .reading-text { font-size: calc(1.05rem * var(--font-scale)); }
  .option { font-size: 1.02rem; padding: 16px; }
  .btn { width: 100%; text-align: center; }
  .footer-nav { flex-direction: column; gap: 10px; }
  .footer-nav .btn { margin-top: 0; }
}