:root {
  --do: #e53935;
  --re: #fb8c00;
  --mi: #e0a800;
  --fa: #43a047;
  --sol: #1e88e5;
  --la: #5e35b1;
  --ti: #d81b60;

  --bg: #fff8ec;
  --card: #ffffff;
  --ink: #2b2340;
  --muted: #6f6688;
  --staff-bg: #fffaf0;
  --shadow: 0 5px 0 rgba(43, 35, 64, 0.1);
  --radius: 20px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1830;
    --card: #2a2445;
    --ink: #f4f0ff;
    --muted: #b3a9d1;
    --shadow: 0 5px 0 rgba(0, 0, 0, 0.35);
    --mi: #f9c623;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-rounded, "SF Pro Rounded", "Nunito", system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

[hidden] { display: none !important; }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  touch-action: manipulation;
}

select { font: inherit; padding: 6px 10px; border-radius: 10px; }

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.eyebrow {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Logo / top bar ---------- */
.logo {
  font-weight: 900;
  font-size: clamp(40px, 10vw, 60px);
  letter-spacing: -1px;
  margin: 0;
  color: var(--sol);
}
.logo span { color: var(--do); }
.logo.small { font-size: 24px; }

.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 820px;
  margin: 0 auto;
  padding: 12px 16px;
}
.topbar .logo { flex: 1; }

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card);
  box-shadow: var(--shadow);
  font-size: 22px;
  font-weight: 900;
  flex: none;
}

.stars {
  background: var(--card);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 900;
  font-size: 18px;
  box-shadow: var(--shadow);
}
.star-icon { color: #f5b301; }
.stars.pop { animation: pop 0.4s ease; }

/* ---------- Overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 16px;
  background: var(--bg);
}
.overlay.dim { background: rgba(28, 24, 48, 0.6); }

.start-card {
  background: var(--card);
  border-radius: 28px;
  padding: 28px 24px;
  max-width: 460px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
}
.start-card p { font-size: 17px; line-height: 1.5; color: var(--muted); }
.start-card .fine { font-size: 14px; margin-bottom: 0; }
.start-card .pill-btn { margin-top: 12px; }

.settings-card { text-align: left; }
.settings-card h2 { margin-top: 0; }
.setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--muted) 25%, transparent);
}
.setting b { display: block; }
.setting small { color: var(--muted); }
.setting input[type="checkbox"] { width: 22px; height: 22px; accent-color: var(--sol); }

.big-btn {
  background: var(--fa);
  color: #fff;
  font-size: 22px;
  font-weight: 900;
  padding: 14px 32px;
  border-radius: 999px;
  box-shadow: 0 5px 0 #2e7d32;
  transition: transform 0.08s;
}
.big-btn:active { transform: translateY(4px); box-shadow: 0 1px 0 #2e7d32; }

/* ---------- Course map ---------- */
.continue-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 8px 0 24px;
  box-shadow: var(--shadow);
  border: 3px solid var(--fa);
}
.continue-title { font-size: 22px; font-weight: 900; margin: 2px 0; }
.continue-meta { color: var(--muted); font-weight: 700; }

.section-head {
  margin: 36px 0 16px;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 2px solid currentColor;
  padding-bottom: 6px;
}
.section-head:first-child { margin-top: 8px; }
.unit { margin-bottom: 28px; }
.unit-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  border-left: 6px solid var(--c);
  padding-left: 12px;
  margin-bottom: 12px;
}
.unit-head h3 { margin: 2px 0; font-size: 22px; color: var(--c); }
.unit-head p { margin: 0; color: var(--muted); }
.unit-count { font-weight: 900; color: var(--muted); white-space: nowrap; padding-top: 18px; }

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}
.lesson-card {
  background: var(--card);
  border-radius: 16px;
  padding: 12px 14px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow);
  border: 2px solid transparent;
  transition: transform 0.08s;
}
.lesson-card:active { transform: translateY(3px); }
.lesson-card.next { border-color: var(--fa); }
.lesson-card .tag { font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.06em; color: var(--c); }
.lesson-name { font-weight: 800; line-height: 1.25; flex: 1; }
.lesson-card .bar { height: 6px; border-radius: 3px; background: var(--bg); overflow: hidden; }
.lesson-card .bar i { display: block; height: 100%; background: var(--c); }
.lesson-card.mastered .bar i { background: var(--fa); }
.lesson-card.mastered .lesson-name::after { content: " \2713"; color: var(--fa); }

/* ---------- Lesson ---------- */
.lesson-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  margin: 4px 0 8px;
}
.lesson-title { margin: 2px 0 0; font-size: 22px; }
.dots { display: flex; gap: 4px; flex: none; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: color-mix(in srgb, var(--muted) 30%, transparent); }
.dots i.right { background: var(--fa); }
.dots i.wrong { background: var(--do); }

.prompt {
  text-align: center;
  font-size: clamp(24px, 6vw, 32px);
  font-weight: 900;
  margin: 12px 0 2px;
  min-height: 1.3em;
}
.sub { text-align: center; color: var(--muted); font-weight: 700; margin-bottom: 12px; min-height: 1.2em; }

.staff {
  display: block;
  width: 100%;
  max-height: 260px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.staff-bg { fill: var(--staff-bg); }
.staff-line { stroke: #3b3355; stroke-width: 1.5; }
.staff-ink { stroke: #3b3355; }
.staff-ink.fill { fill: #3b3355; stroke: none; }
.stem { stroke-width: 2.2; }
.note-label { font-weight: 900; font-size: 15px; font-family: inherit; }
.note-halo { fill: none; stroke: #f5b301; stroke-width: 3; opacity: 0.8; animation: halo 1.2s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
.note.faded { opacity: 0.3; }

.feedback {
  text-align: center;
  font-size: 19px;
  font-weight: 700;
  min-height: 1.5em;
  margin: 14px 0;
  color: var(--muted);
}
.feedback.good { color: var(--fa); }
.feedback.bad { color: var(--do); }

.answers {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.ans-btn {
  background: var(--card);
  min-width: 64px;
  padding: 10px 12px 8px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.15);
  border: 2px solid transparent;
  transition: transform 0.08s;
}
.ans-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.15); }
.ans-btn.colored { background: var(--c); color: #fff; }
.ans-btn.colored .ans-main { text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25); }
.ans-main { font-size: 20px; font-weight: 900; }
.ans-sub { font-size: 12px; font-weight: 700; opacity: 0.8; }
.answers.intervals .ans-btn { min-width: 74px; }
.answers.keys .ans-btn { min-width: 56px; }
.answers.locked .ans-btn { opacity: 0.45; }
.answers.locked .ans-btn.right { opacity: 1; border-color: var(--fa); box-shadow: 0 0 0 3px var(--fa); }
.answers.locked .ans-btn.right.go { cursor: pointer; }
.answers.locked .ans-btn.wrong { opacity: 1; border-color: var(--do); animation: shake 0.4s; }

.action-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.pill-btn {
  background: var(--sol);
  color: #fff;
  font-weight: 900;
  font-size: 16px;
  padding: 11px 20px;
  border-radius: 999px;
  box-shadow: 0 4px 0 #1565c0;
}
.pill-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #1565c0; }
.pill-btn.ghost { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

/* ---------- Pitch meter ---------- */
.meter {
  --c: var(--sol);
  display: flex;
  gap: 18px;
  align-items: stretch;
  margin-top: 16px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.meter-track {
  position: relative;
  width: 60px;
  height: 180px;
  flex: none;
  border-radius: 30px;
  background: var(--bg);
  overflow: hidden;
}
.meter-zone {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 12%;
  background: color-mix(in srgb, var(--fa) 30%, transparent);
}
.meter-target {
  position: absolute;
  left: 6px;
  right: 6px;
  top: 50%;
  height: 4px;
  margin-top: -2px;
  border-radius: 2px;
  background: var(--fa);
}
.meter-ball {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 36px;
  height: 36px;
  margin: -18px 0 0 -18px;
  border-radius: 50%;
  background: var(--c);
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: top 0.08s linear, opacity 0.2s;
}
.meter-ball.idle { opacity: 0.2; }
.meter-side {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-width: 0;
}
.meter-hint { font-size: clamp(20px, 4.5vw, 26px); font-weight: 900; }
.meter-hint.good { color: var(--fa); }
.meter-hint.up, .meter-hint.down { color: var(--re); }
.meter-hint.listen { color: var(--sol); }
.meter-hint.warn { color: var(--do); font-size: clamp(17px, 4vw, 20px); }
.meter-sung { font-size: 15px; color: var(--muted); font-weight: 700; }
.meter-hold { height: 14px; border-radius: 7px; background: var(--bg); overflow: hidden; }
.meter-hold-fill { height: 100%; width: 0; background: var(--fa); transition: width 0.08s linear; }
.meter-level { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 800; color: var(--muted); }
.meter-level-bar { flex: 1; height: 6px; border-radius: 3px; background: var(--bg); overflow: hidden; }
.meter-level-fill { height: 100%; width: 0; background: var(--sol); transition: width 0.08s linear; }
.mic-select { font-size: 13px; max-width: 100%; color: var(--muted); }
.meter-debug { font: 12px ui-monospace, monospace; color: var(--muted); word-break: break-all; }

/* ---------- Celebration ---------- */
#celebrate {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 30;
  overflow: hidden;
}
.celebrate-msg {
  position: absolute;
  left: 50%;
  top: 36%;
  transform: translate(-50%, -50%);
  background: var(--card);
  color: var(--fa);
  font-size: clamp(28px, 7vw, 44px);
  font-weight: 900;
  padding: 14px 30px;
  border-radius: 999px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
  animation: msg 1.8s ease forwards;
}
.celebrate-msg.small { font-size: 30px; padding: 8px 22px; animation-duration: 0.9s; }
.confetti {
  position: absolute;
  top: -20px;
  width: 12px;
  height: 18px;
  border-radius: 3px;
  animation: fall 1.6s ease-in forwards;
}

/* ---------- Dev panel ---------- */
#dev-panel {
  position: fixed;
  bottom: 8px;
  left: 8px;
  right: 8px;
  z-index: 40;
  background: #222;
  color: #eee;
  font: 13px ui-monospace, monospace;
  padding: 8px 12px;
  border-radius: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
#dev-panel input { flex: 1; min-width: 160px; }
#dev-panel button { background: #444; color: #eee; padding: 4px 8px; border-radius: 6px; font: inherit; }

/* ---------- Animations ---------- */
@keyframes pop { 50% { transform: scale(1.25); } }
@keyframes shake {
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}
@keyframes halo { 50% { transform: scale(1.18); opacity: 0.4; } }
@keyframes msg {
  0% { transform: translate(-50%, -50%) scale(0.4); opacity: 0; }
  15% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
  25% { transform: translate(-50%, -50%) scale(1); }
  80% { opacity: 1; }
  100% { transform: translate(-50%, -60%) scale(1); opacity: 0; }
}
@keyframes fall {
  to { transform: translate(var(--drift), 105vh) rotate(var(--spin)); }
}

@media (max-width: 480px) {
  .continue-card { flex-direction: column; align-items: stretch; text-align: center; }
  .lesson-grid { grid-template-columns: 1fr 1fr; }
  .meter-track { height: 150px; width: 52px; }
  .ans-btn { min-width: 56px; padding: 8px 10px 6px; }
  .lesson-head { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01s !important; transition: none !important; }
}

/* ---------- Dictation slots ---------- */
.slots { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 14px 0 0; }
.slot {
  min-width: 64px; padding: 8px 10px; border-radius: 12px; text-align: center;
  background: var(--card); box-shadow: var(--shadow); border: 2px dashed color-mix(in srgb, var(--muted) 50%, transparent);
  font-weight: 900; font-size: 20px; display: flex; flex-direction: column;
}
.slot small { font-size: 12px; font-weight: 700; color: var(--muted); }
.slot.given { border-style: solid; border-color: transparent; color: var(--muted); }
.slot.filled { border-style: solid; border-color: var(--sol); }
.slot.empty.next { border-color: var(--sol); }
.slot.right { border-style: solid; border-color: var(--fa); color: var(--fa); }
.slot.wrong { border-style: solid; border-color: var(--do); color: var(--do); }
.slot.playing { transform: scale(1.08); }
.answers.chords .ans-main { font-size: 18px; }
.answers.dense .ans-btn { min-width: 58px; padding: 8px 8px 6px; }

/* ---------- Rhythm notation ---------- */
.time-sig { font: 900 30px Georgia, "Times New Roman", serif; fill: #3b3355; }
.barline { stroke-width: 1.6; }
.tap-pad {
  width: 160px; height: 160px; border-radius: 50%; margin: 6px auto;
  background: var(--sol); color: #fff; font-size: 30px; font-weight: 900;
  box-shadow: 0 6px 0 #1565c0; touch-action: none; user-select: none; -webkit-user-select: none;
}
.tap-pad.hit { animation: tap 0.12s ease; }
@keyframes tap { 50% { transform: scale(0.93); box-shadow: 0 2px 0 #1565c0; } }
.answers.rhythms .ans-btn { padding: 6px; background: var(--staff-bg); }
.mini-staff { width: 260px; max-width: 80vw; height: auto; display: block; }
.staff.writable { cursor: crosshair; touch-action: none; outline: 3px dashed color-mix(in srgb, var(--sol) 50%, transparent); outline-offset: -3px; }
.answers.tools .tool { min-width: 58px; }
.answers.tools .tool .ans-main { font-size: 24px; }
button.slot { cursor: pointer; font: inherit; }
.staff2 { margin-top: 10px; }
.staff.mine { box-shadow: 0 0 0 3px var(--sol), var(--shadow); }

/* ---------- Learn pages ---------- */
.learn-link { display: inline-block; margin-top: 4px; font-size: 14px; font-weight: 800; color: var(--sol); text-decoration: none; }
.learn-link:hover { text-decoration: underline; }
.feedback .learn-link { font-size: 15px; margin-top: 8px; }
.learn-back { margin: 8px 0 14px; }
#learn .lesson-title { font-size: 28px; margin-bottom: 12px; }
.learn-toc { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }
.learn-toc a {
  background: var(--card); color: var(--ink); text-decoration: none; font-weight: 800; font-size: 14px;
  padding: 6px 12px; border-radius: 999px; box-shadow: var(--shadow);
}
.learn-intro { font-size: 18px; line-height: 1.5; }
.learn-sec {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 4px 18px 16px; margin: 0 0 16px; line-height: 1.55; scroll-margin-top: 12px;
}
.learn-sec h3 { margin: 14px 0 6px; font-size: 20px; color: var(--la); }
.learn-sec.flash { animation: learn-flash 1.6s ease-out; }
@keyframes learn-flash { 0% { box-shadow: 0 0 0 4px var(--mi); } 100% { box-shadow: var(--shadow); } }
.learn-sec ul, .learn-sec ol { padding-left: 22px; }
.learn-sec li { margin: 3px 0; }
.rule { border-left: 5px solid var(--do); background: color-mix(in srgb, var(--do) 8%, transparent); padding: 8px 12px; border-radius: 8px; margin: 8px 0; }
.rule.guide { border-color: var(--fa); background: color-mix(in srgb, var(--fa) 8%, transparent); }
.learn-table { border-collapse: collapse; width: 100%; margin: 8px 0; font-size: 15px; }
.learn-table th, .learn-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid color-mix(in srgb, var(--muted) 30%, transparent); }
.learn-table th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }
.learn-ex { margin: 12px 0 4px; }
.learn-ex .staff { max-height: 200px; box-shadow: none; border-radius: 12px; }
.learn-ex .staff + .staff { margin-top: -6px; }
.learn-ex figcaption { text-align: center; font-weight: 700; margin-top: 6px; }
.learn-ex .action-row { margin-top: 8px; }
.muted { color: var(--muted); }
.book-line { margin-top: 4px; display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 13px; color: var(--muted); }
.book-ref b { color: var(--c, var(--la)); font-weight: 800; }
.lesson-book { display: block; margin-top: 4px; font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: 0.02em; }
.answers.tools .voice-pick { min-width: 44px; }
.answers.tools .voice-pick.on { background: var(--sol); border-color: var(--sol); color: #fff; }
.write-list { margin: 6px 0 0; padding-left: 20px; text-align: left; font-weight: 600; font-size: 15px; }
.write-list li { margin: 2px 0; }
.acc.right line, .acc.right path { stroke: var(--fa); }
.acc.wrong line, .acc.wrong path { stroke: var(--do); }
.meter-sig { display: inline-flex; flex-direction: column; align-items: center; font-family: Georgia, 'Times New Roman', serif; font-size: 54px; line-height: 0.9; }
.meter-sig b { font-weight: 700; }
.learn-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 0 0 12px; font-size: 14px; }
.learn-tags .chip { border: 2px solid color-mix(in srgb, var(--muted) 40%, transparent); background: transparent; color: inherit; border-radius: 999px; padding: 4px 12px; font: inherit; font-weight: 700; cursor: pointer; }
.learn-tags .chip.on { background: var(--la); border-color: var(--la); color: #fff; }
.note-tag { font-size: 11px; font-weight: 800; font-family: inherit; }
.learn-chords { list-style: none; padding: 0 !important; margin: 6px auto 0; max-width: 620px; font-size: 14px; line-height: 1.45; color: var(--muted); }
.learn-chords li { margin: 2px 0; }
.learn-chords b { color: var(--ink); }
.why { margin: 6px 0 0; font-size: 14px; opacity: 0.85; }
.term { display: inline; border: 0; padding: 0; margin: 0; background: none; font: inherit; color: inherit; cursor: help;
  text-decoration: underline dotted color-mix(in srgb, var(--sol) 80%, transparent); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.term:hover, .term:focus-visible { color: var(--sol); }
.term-pop { display: block; margin: 8px 0; padding: 10px 12px; border-radius: 10px; font-size: 15px; font-weight: 400; line-height: 1.45;
  background: color-mix(in srgb, var(--sol) 14%, var(--card)); border-left: 4px solid var(--sol); }
.term-pop .learn-link { margin-left: 4px; }
.learn-practice { background: transparent; box-shadow: none; padding: 0; }
@media (max-width: 520px) {
  .learn-table { font-size: 13px; }
  .learn-table th, .learn-table td { padding: 5px 4px; }
}