:root {
  --bg: #f4f1ea;
  --panel: #ffffff;
  --ink: #2c2a26;
  --muted: #7a756a;
  --accent: #e8577a;
  --accent-2: #2fb6a3;
  --good: #3fae5c;
  --radius: 16px;
  --shadow: 0 6px 20px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans TC", "Segoe UI", system-ui, sans-serif;
  padding: 20px 16px 48px;
}

.topbar {
  max-width: 1000px;
  margin: 0 auto 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.topbar h1 {
  font-size: 1.4rem;
  margin: 0;
  flex: 1 0 auto;
}

.level-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

.level-picker select {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #ddd6c7;
  font-size: 0.9rem;
}

.progress {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 180px;
}

#progressText {
  font-weight: 700;
  white-space: nowrap;
}

.progress-bar {
  flex: 1;
  height: 10px;
  background: #e6e0d2;
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-2), var(--good));
  transition: width 0.4s ease;
}

main {
  max-width: 1000px;
  margin: 0 auto;
}

.stage-wrap {
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

#levelTitle {
  margin: 0 0 12px;
  font-size: 1.1rem;
  color: var(--muted);
}

.stage {
  position: relative;
  width: 100%;
  line-height: 0;
  border-radius: 12px;
  overflow: hidden;
}

.layer {
  display: block;
  width: 100%;
  height: auto;
}

.layer.gray {
  position: absolute;
  top: 0;
  left: 0;
  -webkit-mask-image: url(#revealMask);
  mask-image: url(#revealMask);
}

.mask-defs { position: absolute; }

#maskHoles rect,
#maskHoles image {
  opacity: 0;
  transition: opacity 0.6s ease;
}

#maskHoles rect.revealed,
#maskHoles image.revealed {
  opacity: 1;
}

.toast {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--good);
  color: #fff;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: var(--shadow);
  animation: pop 1.4s ease forwards;
  pointer-events: none;
}

@keyframes pop {
  0% { opacity: 0; transform: translateX(-50%) translateY(-8px) scale(0.9); }
  15% { opacity: 1; transform: translateX(-50%) translateY(0) scale(1); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) translateY(-6px) scale(0.95); }
}

.controls {
  margin-top: 20px;
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
}

.mic-btn {
  font-size: 1.1rem;
  padding: 14px 28px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, background 0.2s ease;
}

.mic-btn:hover { transform: translateY(-1px); }

.mic-btn.listening {
  background: var(--accent-2);
  animation: pulse 1.4s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(47,182,163,0.5); }
  70% { box-shadow: 0 0 0 14px rgba(47,182,163,0); }
  100% { box-shadow: 0 0 0 0 rgba(47,182,163,0); }
}

.heard-text {
  margin-top: 14px;
  min-height: 1.4em;
  color: var(--muted);
  font-size: 0.95rem;
}

.type-form {
  margin-top: 14px;
  display: flex;
  gap: 8px;
  justify-content: center;
}

.type-form input {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid #ddd6c7;
  font-size: 1rem;
  width: 220px;
}

.type-form button {
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
}

.word-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.word-list li {
  padding: 6px 12px;
  border-radius: 999px;
  background: #eee8d8;
  color: var(--muted);
  font-size: 0.9rem;
  transition: background 0.3s ease, color 0.3s ease;
}

.word-list li.done {
  background: var(--good);
  color: #fff;
}

.upload-wrap {
  margin-top: 20px;
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
}

.upload-wrap h2 {
  margin: 0 0 14px;
  font-size: 1rem;
  color: var(--muted);
}

.upload-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  align-items: center;
}

.upload-form input[type="file"] {
  font-size: 0.9rem;
  max-width: 100%;
}

.upload-form button {
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.upload-form button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.upload-status {
  margin-top: 12px;
  min-height: 1.4em;
  font-size: 0.9rem;
  color: var(--muted);
}

.upload-status.error { color: var(--accent); }
.upload-status.success { color: var(--good); }

.review-wrap {
  margin-top: 20px;
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.review-wrap h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.review-hint {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--muted);
}

.review-title-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.review-title-row input {
  flex: 1 1 200px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #ddd6c7;
  font-size: 0.95rem;
}

.review-stage {
  position: relative;
  width: 100%;
  line-height: 0;
  border-radius: 12px;
  overflow: hidden;
  touch-action: none;
}

.review-img {
  display: block;
  width: 100%;
  height: auto;
}

.review-boxes {
  position: absolute;
  inset: 0;
}

.review-box {
  position: absolute;
  border: 2px solid var(--accent-2);
  background: rgba(47, 182, 163, 0.12);
  cursor: move;
  box-sizing: border-box;
}

.review-box.selected {
  border-color: var(--accent);
  background: rgba(232, 87, 122, 0.15);
  z-index: 2;
}

.review-box .box-label {
  position: absolute;
  top: -1.6em;
  left: -2px;
  background: var(--accent-2);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px 4px 0 0;
  white-space: nowrap;
  pointer-events: none;
}

.review-box.selected .box-label { background: var(--accent); }

.review-box .box-delete {
  position: absolute;
  top: -1.7em;
  right: -2px;
  width: 1.4em;
  height: 1.4em;
  line-height: 1.4em;
  text-align: center;
  background: var(--ink);
  color: #fff;
  border-radius: 50%;
  font-size: 0.7rem;
  cursor: pointer;
}

.review-box .resize-handle {
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  cursor: nwse-resize;
}

.review-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.review-list li {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 6px 10px;
  border-radius: 8px;
  background: #f4f1ea;
}

.review-list li.selected { background: #fdeef1; }

.review-list input {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid #ddd6c7;
  font-size: 0.9rem;
}

.review-list .review-word { width: 140px; }
.review-list .review-zh { width: 90px; }

.review-list .review-delete {
  margin-left: auto;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 1rem;
}

.review-actions {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.review-cancel-btn {
  padding: 14px 22px;
  border-radius: 999px;
  border: 1px solid #ddd6c7;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
}

@media (max-width: 480px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .type-form input { width: 100%; }
  .review-list .review-word { width: 100px; }
  .review-list .review-zh { width: 70px; }
}