:root {
  --bg: #fff8ef;
  --card: #ffffff;
  --ink: #2b2b2b;
  --accent: #3d8bfd;
  --accent-dark: #1f5fc9;
  --good: #2f9e44;
  --bad: #e03131;
  --soft: #ffe8c2;
  --george: #e8f1ff;
  --pip: #e9f8ea;
  --ember: #ffe4e4;
  --daddy: #eee6f8;
  --narrator: #fff7e8;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius: 20px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Comic Sans MS", "Nunito", system-ui, sans-serif;
  background:
    radial-gradient(circle at 10% 10%, #c9e7ff 0, transparent 40%),
    radial-gradient(circle at 90% 0%, #ffe9b8 0, transparent 35%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
  touch-action: pan-y;
}
.app { max-width: 920px; margin: 0 auto; padding: 16px 16px 48px; }
header.top {
  display: flex; flex-wrap: wrap; gap: 10px;
  align-items: center; justify-content: space-between; margin-bottom: 12px;
}
.brand { font-weight: 800; font-size: 1.1rem; color: var(--accent-dark); }
.toolbar {
  display: flex; flex-wrap: wrap; gap: 8px;
  align-items: center; justify-content: flex-end;
}
.nav-links a { color: var(--accent-dark); text-decoration: none; font-weight: 700; margin-left: 10px; }
.jump {
  display: flex; align-items: center; gap: 6px;
  font-weight: 800; color: #445; font-size: 0.95rem;
}
.jump select {
  font: inherit; font-weight: 800;
  border-radius: 999px; padding: 8px 12px;
  border: 2px solid #d7e6ff; background: #fff; color: var(--accent-dark);
  max-width: 180px;
}
.btn-auto {
  background: #e7f5ff; color: var(--accent-dark);
  border: none; border-radius: 999px;
  padding: 10px 16px; font-size: 0.95rem; font-weight: 800; cursor: pointer;
}
.btn-auto.on { background: #2f9e44; color: #fff; }
.progress {
  background: #eee; border-radius: 999px; height: 12px;
  overflow: hidden; margin-bottom: 14px;
}
.progress > span {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, #6c8cff, #3d8bfd);
  transition: width 0.3s ease;
}
.screen {
  display: none; background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px;
}
.screen.active { display: block; }
.screen[hidden] { display: none !important; }
.quiz-item h3 { font-size: 1.3rem; margin: 0 0 8px; }
.screen.slide-next { animation: slideNext 0.28s ease; }
.screen.slide-prev { animation: slidePrev 0.28s ease; }
@keyframes slideNext {
  from { opacity: 0; transform: translateX(28px); }
  to { opacity: 1; transform: none; }
}
@keyframes slidePrev {
  from { opacity: 0; transform: translateX(-28px); }
  to { opacity: 1; transform: none; }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
h1, h2 { margin: 0 0 12px; line-height: 1.2; }
h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); color: var(--accent-dark); }
.hero {
  width: 100%; border-radius: 16px; display: block;
  margin: 0 auto 16px; max-height: 380px; object-fit: cover; background: #f3f3f3;
}
.hero.is-loading { min-height: 200px; }
.hero.loaded { animation: fadeIn 0.2s ease; }
.hint { text-align: center; color: #666; font-size: 1rem; margin: 0 0 10px; }
.page-meta { text-align: center; color: #888; font-weight: 700; margin-bottom: 6px; }
.voice-key {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  margin: 0 0 12px; font-size: 0.92rem; font-weight: 700;
}
.voice-key span { padding: 4px 10px; border-radius: 999px; background: #f3f3f3; }
.voice-key .george { background: var(--george); color: #1f5fc9; }
.voice-key .pip { background: var(--pip); color: #2b8a3e; }
.voice-key .ember { background: var(--ember); color: #c92a2a; }
.voice-key .daddy { background: var(--daddy); color: #5b3d8a; }
.voice-key .narrator { background: var(--narrator); color: #8a5a00; }

.lines { display: grid; gap: 10px; margin: 8px 0 16px; }
.line {
  border: 3px solid transparent; border-radius: 16px; padding: 12px 14px;
  cursor: pointer; text-align: left; font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  line-height: 1.45; font-weight: 700; transition: border-color 0.15s, transform 0.1s, box-shadow 0.15s;
}
.line:hover { transform: translateY(-1px); }
.line.narrator { background: var(--narrator); border-color: #ffe0a0; }
.line.george { background: var(--george); border-color: #b7d4ff; }
.line.pip { background: var(--pip); border-color: #b6e6b8; }
.line.ember { background: var(--ember); border-color: #ffb0b0; }
.line.daddy { background: var(--daddy); border-color: #c9b3e8; }
.line.playing, .vocab-card.playing, .sight-word.playing, .quiz-opt.playing {
  box-shadow: 0 0 0 3px #f0c000; border-color: #f0c000 !important;
}
.line .who {
  display: block; font-size: 0.85rem; font-weight: 800;
  letter-spacing: 0.02em; margin-bottom: 4px; opacity: 0.75; text-transform: uppercase;
}

.controls {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 8px;
}
button, .btn {
  appearance: none; border: none; border-radius: 999px;
  padding: 14px 22px; font-size: 1.05rem; font-weight: 800; cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease;
}
button:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { background: var(--soft); color: #7a4b00; }
.btn-ghost { background: #eef2f7; color: #334; }
.btn-good { background: #d3f9d8; color: #2b8a3e; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.vocab-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px; margin: 16px 0;
}
.vocab-card {
  background: #f8fbff; border: 3px solid #dce9ff; border-radius: 16px;
  padding: 10px; text-align: center; cursor: pointer;
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.vocab-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.vocab-card img {
  width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 12px;
  display: block; margin-bottom: 8px; background: #eef3fa;
}
.vocab-card .label { font-size: 1.35rem; font-weight: 800; }
.vocab-card .example {
  margin-top: 6px; font-size: 0.95rem; font-weight: 700; color: #445; line-height: 1.35;
}

.quiz-options { display: grid; gap: 12px; margin: 16px 0; }
.quiz-options button, .quiz-opt {
  width: 100%; text-align: left; background: #f4f8ff; color: var(--ink);
  border: 3px solid #d7e6ff; border-radius: 16px; font-size: 1.2rem;
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
}
.quiz-opt .opt-letter {
  flex: 0 0 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center;
  background: #d7e6ff; color: var(--accent-dark); font-weight: 900;
}
.quiz-options button.correct, .quiz-opt.correct { background: #d3f9d8; border-color: var(--good); }
.quiz-options button.wrong, .quiz-opt.wrong { background: #ffe3e3; border-color: var(--bad); }
.quiz-opt.correct .opt-letter { background: var(--good); color: #fff; }
.quiz-opt.wrong .opt-letter { background: var(--bad); color: #fff; }
.feedback {
  min-height: 1.5em; text-align: center; font-size: 1.25rem;
  font-weight: 800; margin: 8px 0 4px;
}
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

.sight-grid {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 18px 0;
}
.sight-word {
  min-width: 120px; font-size: 1.2rem; background: #fff;
  border: 3px dashed #9ec5ff; color: var(--accent-dark);
  border-radius: 16px; padding: 14px 16px;
}
.sight-word.done { border-style: solid; background: #e7f5ff; }

.learning-box {
  background: #f4f8ff; border: 2px solid #d7e6ff; border-radius: 14px;
  padding: 12px 14px; margin: 0 0 14px; font-size: 1rem; line-height: 1.5; color: #334;
}
.learning-box strong { color: var(--accent-dark); }
.learning-box ul { margin: 8px 0 0; padding-left: 1.2em; }

.notes label {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 1.1rem; margin: 8px 0; cursor: pointer;
}
.notes textarea {
  width: 100%; min-height: 110px; border-radius: 14px;
  border: 2px solid #d7e6ff; padding: 12px; font-size: 1.05rem;
  font-family: inherit; resize: vertical;
}
.save-msg { color: var(--good); font-weight: 700; min-height: 1.2em; }
footer.note { margin-top: 18px; text-align: center; color: #777; font-size: 0.95rem; }
.continue {
  background: #eef2ff; border: 2px solid #c5d0ff; border-radius: 14px;
  padding: 10px 14px; margin-bottom: 12px; text-align: center; font-weight: 700; color: #3b4a9c;
}

.swipe-hint {
  text-align: center; color: #99a; font-size: 0.85rem; font-weight: 700; margin: 10px 0 0;
}

@media (max-width: 640px) {
  .jump select { max-width: 140px; }
  .hero { max-height: 240px; }
}

/* Video mode (AI story clips) */
body.video-mode .video-wrap {
  overflow: hidden;
  border-radius: 16px;
  margin: 0 auto 16px;
  max-height: 380px;
  background: #f3f3f3;
}
body.video-mode .video-wrap video.hero {
  width: 100%;
  max-height: 380px;
  object-fit: contain;
  display: block;
  border-radius: 16px;
  background: #111;
}
@media (max-width: 640px) {
  body.video-mode .video-wrap,
  body.video-mode .video-wrap video.hero { max-height: 240px; }
}