:root {
  color-scheme: light;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: #26364a;
  background: #fff8e8;
  font-synthesis: none;
  --ink: #26364a;
  --muted: #718095;
  --green: #3e9272;
  --green-dark: #267353;
  --yellow: #ffc943;
  --paper: #ffffff;
  --line: #e9e3d8;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: radial-gradient(circle at 8% 14%, #fff0c1 0, transparent 22rem), #fff8e8; }
button, input { font: inherit; }
button { cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid #2f84a0; outline-offset: 3px; }
[hidden] { display: none !important; }
.app-shell { max-width: 1120px; min-height: 100vh; margin: auto; padding: 0 34px; display: flex; flex-direction: column; }
.topbar { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 18px; border-bottom: 1px solid #e8dfcf; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; }
.brand-mark { width: 43px; height: 43px; display: grid; place-items: center; border-radius: 15px; background: #e7f2c2; font-size: 23px; overflow: hidden; }
.brand-mark img { width: 100%; height: 100%; display: block; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 16px; letter-spacing: -.3px; }
.brand small { margin-top: 3px; color: var(--muted); font-size: 11px; }
.lesson-title { display: flex; align-items: center; gap: 11px; font-size: 14px; }
.lesson-tag, .eyebrow { color: var(--green-dark); font-size: 10px; font-weight: 800; letter-spacing: 1.25px; }
.lesson-tag { padding: 7px 9px; border-radius: 9px; background: #e7f2c2; }
.voice-toggle { display: inline-flex; align-items: center; gap: 7px; min-height: 42px; padding: 0 13px; border: 1px solid var(--line); border-radius: 13px; background: var(--paper); color: var(--ink); font-size: 13px; cursor: pointer; }
.voice-toggle input { accent-color: var(--green); width: 16px; height: 16px; }
.audio-controls { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; }
.volume-control { display: flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 10px; border: 1px solid var(--line); border-radius: 13px; background: var(--paper); color: var(--ink); font-size: 12px; white-space: nowrap; }
.volume-control input { width: 108px; accent-color: var(--green); cursor: pointer; }
.volume-control output { min-width: 34px; color: var(--green-dark); font-variant-numeric: tabular-nums; text-align: right; }
.volume-note { max-width: 360px; margin: 0 0 0 auto; color: var(--muted); font-size: 10px; line-height: 1.35; text-align: right; }
main { flex: 1; padding: 38px 0 22px; }
.screen { max-width: 920px; margin: auto; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.eyebrow { margin: 0 0 8px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(26px, 4vw, 36px); letter-spacing: -1px; }
.step-count { margin: 0 0 4px; padding: 9px 13px; border-radius: 12px; background: #fff; color: #59697d; font-size: 13px; white-space: nowrap; }
.story-card { display: grid; grid-template-columns: minmax(280px, .95fr) 1.05fr; overflow: hidden; min-height: 365px; border: 1px solid #efe9dd; border-radius: 27px; background: var(--paper); box-shadow: 0 18px 45px #503f1a12; }
.scene-art { position: relative; min-height: 365px; display: grid; place-items: center; overflow: hidden; isolation: isolate; background: linear-gradient(180deg, #bcecf3 0 59%, #b9d875 60% 100%); }
.scene-art::before { position: absolute; z-index: -1; content: ""; width: 350px; height: 90px; bottom: -22px; left: -35px; border-radius: 50%; background: #8abb4f; }
.scene-art::after { position: absolute; z-index: -1; content: ""; width: 280px; height: 75px; right: -65px; bottom: 22px; border-radius: 50%; background: #a3c866; }
.scene-image { width: min(82%, 420px); height: min(82%, 330px); object-fit: contain; border-radius: 20px; filter: drop-shadow(0 12px 12px #385a3b24); }
.sun { position: absolute; top: 24px; right: 32px; font-size: 40px; }
.leaf { position: absolute; bottom: 32px; font-size: 52px; }
.leaf-one { left: 23px; }.leaf-two { right: 18px; bottom: 22px; font-size: 72px; }
.scene-copy { align-self: center; padding: 35px clamp(22px, 4vw, 48px); }
.scene-kicker { margin-bottom: 10px; color: #ba8425; font-size: 10px; font-weight: 800; letter-spacing: 1.4px; }
.scene-copy h2 { margin-bottom: 15px; font-size: 28px; letter-spacing: -.6px; }
.english-line { margin-bottom: 8px; color: #34475b; font-size: clamp(18px, 2.2vw, 22px); font-weight: 700; line-height: 1.45; }
.vietnamese-line { margin-bottom: 27px; color: var(--muted); font-size: 15px; line-height: 1.5; }
.scene-controls { display: flex; align-items: center; gap: 10px; }
.icon-button, .play-button, .primary-button, .secondary-button, .text-button { border: 0; border-radius: 14px; font-weight: 800; }
.icon-button { width: 48px; height: 48px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-size: 24px; }
.icon-button:disabled { opacity: .4; cursor: not-allowed; }
.play-button { min-height: 48px; padding: 0 20px; background: var(--green); color: #fff; font-size: 14px; }
.play-button:hover, .primary-button:hover { background: var(--green-dark); }
.audio-status { min-height: 18px; margin: 12px 0 0; color: #65768a; font-size: 12px; }
.story-footer { display: flex; align-items: center; gap: 17px; margin-top: 19px; }
.progress-track { height: 8px; flex: 1; overflow: hidden; border-radius: 9px; background: #e9e5dc; }
.progress-track span { display: block; width: 16.66%; height: 100%; border-radius: inherit; background: var(--yellow); transition: width .25s ease; }
.tap-hint { color: var(--muted); font-size: 12px; }
.content-screen { padding-top: 3px; }
.section-intro { margin: -6px 0 21px; color: var(--muted); }
.animal-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.animal-option { min-height: 118px; padding: 14px 8px; border: 2px solid transparent; border-radius: 19px; background: #fff; color: var(--ink); box-shadow: 0 8px 20px #513e180c; transition: transform .15s ease, border-color .15s ease; }
.animal-option:hover { transform: translateY(-3px); }
.animal-option[aria-pressed="true"] { border-color: #65a587; background: #f0f8e9; }
.animal-option img { display: block; width: 100%; height: 76px; margin: 0 auto 8px; border-radius: 12px; object-fit: cover; }
.animal-option small { display: block; }
.animal-option small { font-size: 13px; font-weight: 800; }
.word-card { display: flex; align-items: center; gap: 20px; margin-top: 21px; padding: 20px 25px; border: 1px solid #ebe6dc; border-radius: 22px; background: #fff; }
.word-image { width: 110px; height: 82px; flex: 0 0 auto; border-radius: 14px; object-fit: cover; }
.word-card .eyebrow { margin-bottom: 4px; }
.word-card h2 { margin: 0 0 3px; font-size: 25px; }
.word-card p:last-child { margin: 0; color: var(--muted); }
.secondary-button { min-height: 46px; margin-left: auto; padding: 0 17px; border: 1px solid #d6e8dc; background: #f0f8f2; color: var(--green-dark); }
.section-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 20px; }
.primary-button { min-height: 50px; padding: 0 22px; background: var(--green); color: #fff; }
.text-button { min-height: 44px; padding: 0 8px; background: transparent; color: #5f7082; }
.quiz-card { max-width: 700px; margin: 30px auto; padding: clamp(25px, 5vw, 49px); border: 1px solid #ece6db; border-radius: 27px; background: #fff; box-shadow: 0 18px 45px #503f1a12; }
.quiz-counter { margin-bottom: 9px; color: #bc8425; font-size: 12px; font-weight: 800; letter-spacing: .8px; text-transform: uppercase; }
.quiz-feedback { min-height: 20px; margin-bottom: 5px; color: var(--green-dark); font-weight: 700; }
.quiz-card h2 { margin-bottom: 24px; font-size: clamp(23px, 3vw, 30px); line-height: 1.35; }
.answer-list { display: grid; gap: 11px; }
.answer-button { min-height: 57px; padding: 12px 17px; border: 1px solid #e3e7e8; border-radius: 14px; background: #fff; color: var(--ink); text-align: left; font-size: 16px; font-weight: 700; }
.answer-button:hover { border-color: #88bea5; background: #f5fbf5; }
.results-card { max-width: 640px; margin: 35px auto; padding: clamp(30px, 6vw, 62px); border-radius: 30px; background: #fff; text-align: center; box-shadow: 0 18px 45px #503f1a12; }
.result-stars { margin-bottom: 18px; color: #e6aa23; font-size: 53px; letter-spacing: 8px; }
.results-card h1 { margin-bottom: 13px; }
.results-message { color: var(--muted); line-height: 1.6; }
.result-actions { justify-content: center; flex-wrap: wrap; margin-top: 26px; }
.result-actions .secondary-button { margin-left: 0; }
.app-footer { display: flex; justify-content: space-between; gap: 15px; padding: 20px 0; border-top: 1px solid #e8dfcf; color: #758296; font-size: 11px; }
.mini-screen { max-width: 850px; }
.lesson-catalog { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.lesson-tile { display: grid; justify-items: center; gap: 7px; min-width: 0; min-height: 132px; padding: 13px 9px; border: 1px solid #f0e3c8; border-radius: 18px; background: #fff; color: var(--ink); text-align: center; }
.lesson-tile:hover { border-color: #86b79f; background: #f5fbf5; }
.lesson-tile-icon { display: grid; place-items: center; width: 64px; height: 64px; font-size: 32px; line-height: 1.2; }
.lesson-tile-image { overflow: hidden; border-radius: 15px; background: #fff8e8; }
.lesson-tile-image img { display: block; width: 100%; height: 100%; object-fit: contain; }
.lesson-tile strong { font-size: 14px; line-height: 1.3; overflow-wrap: anywhere; }
.lesson-tile small { color: var(--muted); font-size: 11px; }
.mini-panel { padding: clamp(18px, 4vw, 32px); border: 1px solid #ece6db; border-radius: 26px; background: #fff; box-shadow: 0 16px 38px #503f1a10; }
.mini-instruction { margin: 0 0 20px; color: #536579; font-size: clamp(18px, 3vw, 22px); font-weight: 700; text-align: center; }
.mini-song-video-wrap { max-width: 760px; margin: 0 auto 22px; }
.mini-song-video-title { margin: 0 0 10px; color: var(--ink); font-weight: 800; text-align: center; }
.mini-song-video { display: block; width: 100%; aspect-ratio: 16 / 9; max-height: 430px; border-radius: 18px; background: #183247; object-fit: contain; }
.mini-preview-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: start; gap: 14px; }
.mini-preview-card { display: grid; align-content: start; justify-items: center; gap: 9px; min-width: 0; padding: 12px; border-radius: 20px; background: #fff9ed; }
.mini-preview-card img { width: 100%; height: auto; min-width: 0; aspect-ratio: 1; border-radius: 15px; object-fit: contain; }
.mini-illustration { display: grid; place-items: center; width: 100%; aspect-ratio: 1; border-radius: 15px; background: linear-gradient(145deg, #fff1cc, #e8f4d5); font-size: clamp(48px, 10vw, 82px); line-height: 1; }
.mini-lion-trigger { display: block; position: relative; width: 100%; aspect-ratio: 1; overflow: hidden; padding: 0; border: 0; border-radius: 15px; background: #f6ead3; }
.mini-lion-trigger:focus-visible { outline: 3px solid #2f84a0; outline-offset: 4px; }
.mini-lion-trigger > img, .mini-lion-video { display: block; width: 100%; height: 100%; border-radius: inherit; object-fit: cover; }
.mini-preview-card span { font-size: 19px; font-weight: 800; }
.mini-word-listen { min-height: 44px; padding: 0 15px; border: 1px solid #d6e8dc; border-radius: 13px; background: #f0f8f2; color: var(--green-dark); font-weight: 800; }
.mini-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; max-width: 560px; margin: 22px auto 0; }
.mini-action { display: flex; align-items: center; justify-content: center; gap: 6px; min-width: 0; min-height: 52px; margin: 0; padding: 8px 14px; text-align: center; }
.mini-story { border-color: #d6e8dc; background: #f0f8f2; }
.mini-round { margin-bottom: 14px; color: #9b762c; font-size: 15px; font-weight: 800; text-align: center; }
.listen-button { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 62px; margin: 0 auto 22px; padding: 0 24px; border: 0; border-radius: 18px; background: #e7f2c2; color: #315b43; font-size: 19px; font-weight: 800; }
.mini-target-fallback { margin: -10px 0 18px; color: #315b43; font-size: 22px; font-weight: 800; text-align: center; }
.mini-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; max-width: 660px; margin: auto; }
.mini-options.mini-two-options { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 470px; }
.mini-choice { min-width: 0; padding: 8px; border: 3px solid transparent; border-radius: 22px; background: #fff8e8; transition: border-color .15s ease, transform .15s ease; }
.mini-choice:hover { border-color: #a9cc68; }
.mini-choice img { display: block; width: 100%; height: auto; aspect-ratio: 1; border-radius: 16px; object-fit: contain; }
.mini-choice .mini-illustration { font-size: clamp(48px, 10vw, 76px); }
.mini-choice-label { display: block; min-height: 1.4em; margin-top: 5px; color: var(--ink); font-weight: 800; overflow-wrap: anywhere; }
.mini-feedback { min-height: 32px; margin: 18px 0 0; color: var(--green-dark); font-size: 20px; font-weight: 800; text-align: center; }
.mini-pop { animation: mini-pop 360ms ease-out 1 both; }
.mini-finish { text-align: center; }
.mini-finish-icon { margin: 0 0 8px; font-size: 64px; }
.mini-finish h2 { margin-bottom: 8px; font-size: clamp(27px, 5vw, 36px); }
.mini-finish p:not(.mini-finish-icon) { color: var(--muted); font-size: 17px; }
@keyframes mini-pop { 0% { opacity: .55; transform: scale(.97); } 70% { transform: scale(1.04); } 100% { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; scroll-behavior: auto !important; transition-duration: .01ms !important; } }
@media (prefers-reduced-motion: reduce) { .mini-pop { animation: none !important; } }
@media (max-width: 700px) {
  .app-shell { padding: 0 18px; }
  .topbar { min-height: 74px; flex-wrap: wrap; padding: 12px 0; }
  .lesson-title { display: none; }
    .audio-controls { flex: 1 0 100%; flex-direction: row; flex-wrap: wrap; justify-content: space-between; }
  main { padding-top: 28px; }
  .section-heading { align-items: center; }
  .story-card { grid-template-columns: 1fr; }
  .scene-art { min-height: 245px; }
  .scene-image { width: min(80%, 360px); height: 205px; }
  .scene-copy { padding: 25px 24px 24px; }
  .scene-copy h2 { font-size: 25px; }
  .animal-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .animal-option { min-height: 102px; }
  .word-card { gap: 13px; padding: 17px; }
  .word-image { width: 86px; height: 70px; }
  .secondary-button { padding: 0 12px; font-size: 13px; }
  .app-footer { flex-direction: column; gap: 6px; }
  .mini-preview-grid, .mini-options { gap: 8px; }
  .lesson-catalog { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; }
  .lesson-tile { min-height: 112px; padding: 10px 6px; }
  .mini-preview-card { padding: 7px; }
  .mini-preview-card span { font-size: 16px; }
  .mini-word-listen { min-height: 40px; padding: 0 9px; font-size: 12px; }
  .mini-choice { padding: 5px; border-width: 2px; }
  .mini-actions { gap: 8px; }
  .mini-action { padding: 8px; font-size: 13px; }
}
@media (max-width: 380px) {
  .app-shell { padding: 0 12px; }
  .brand strong { font-size: 14px; }
  .voice-toggle { padding: 0 8px; font-size: 12px; }
  .volume-control { gap: 6px; padding: 0 7px; font-size: 11px; }
    .volume-control input { width: 96px; }
    .volume-note { flex-basis: 100%; max-width: none; text-align: left; }
  .section-heading { flex-wrap: wrap; align-items: flex-start; gap: 8px; }
  .step-count { padding: 8px; font-size: 11px; }
  .word-card { flex-wrap: wrap; }
  .word-card .secondary-button { margin-left: auto; }
  .tap-hint { display: none; }
  .lesson-catalog { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mini-actions { grid-template-columns: 1fr; max-width: 100%; }
}