@font-face {
  font-family: "Bravura";
  src: url("assets/fonts/Bravura.otf") format("opentype");
  font-display: block;
}

:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --ink: #202124;
  --muted: #62666d;
  --line: #cfd4dc;
  --accent: #f7c948;
  --accent-strong: #b7791f;
  --green: #1f9d55;
  --red: #d64545;
  --blue: #2f80ed;
  --panel: #ffffff;
  --shadow: 0 18px 50px rgba(24, 31, 43, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

button,
input {
  font: inherit;
}

.app {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 36px;
}

.topbar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1;
}

#prompt {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  margin: 0 0 16px;
  padding: 10px 18px;
  color: var(--ink);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 850;
  line-height: 1.15;
  text-align: center;
}

.hint {
  margin: -6px 0 16px;
  color: var(--muted);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  text-align: center;
}

.score {
  display: grid;
  place-items: center;
  min-width: 92px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.score span:first-child {
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
}

.score span:last-child {
  color: var(--muted);
  font-size: 13px;
  text-transform: uppercase;
}

.controls {
  display: grid;
  grid-template-columns: minmax(580px, 2fr) minmax(240px, 1fr) minmax(290px, 1.1fr);
  gap: 14px;
  align-items: end;
  margin-bottom: 18px;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.segmented {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}

.segmented label,
.toggle {
  min-height: 46px;
  cursor: pointer;
  user-select: none;
}

.segmented input,
.toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented span {
  display: grid;
  place-items: center;
  height: 100%;
  min-width: 0;
  padding: 10px 12px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-weight: 700;
  line-height: 1.15;
  text-align: center;
}

.segmented label:first-child span {
  border-left: 0;
}

.segmented input:checked + span {
  background: #1f2937;
  color: white;
}

.toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 146px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  font-weight: 700;
}

.toggle:has(input:checked) {
  border-color: var(--blue);
  color: #0f3f84;
  background: #eef6ff;
}

.board {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.keyboard {
  width: 100%;
  overflow: hidden;
}

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

.interval-quiz {
  display: grid;
  gap: 36px;
}

.interval-quiz[hidden] {
  display: none;
}

.interval-section {
  display: grid;
  gap: 18px;
}

.interval-title {
  margin: 0;
  color: var(--ink);
  font-size: 28px;
  font-weight: 850;
  text-align: center;
}

.interval-title strong {
  color: var(--red);
}

.interval-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(100px, 1fr));
  gap: 18px;
}

.interval-card {
  display: grid;
  justify-items: center;
  gap: 10px;
  min-width: 0;
}

.interval-note {
  min-height: 54px;
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 42px;
  font-weight: 800;
  line-height: 1;
}

.interval-input {
  width: 100%;
  min-height: 48px;
  min-width: 0;
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 26px;
  font-weight: 800;
  text-align: center;
}

.interval-input:focus {
  border-color: var(--blue);
  outline: 0;
}

.interval-input.correct {
  border-color: var(--green);
  background: #edfdf2;
}

.interval-input.wrong {
  border-color: var(--red);
  background: #fff1f1;
}

.solfege-map {
  display: grid;
  justify-items: center;
  gap: 22px;
  padding: 10px 0 4px;
}

.solfege-map[hidden] {
  display: none;
}

.map-card {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.map-context {
  color: var(--muted);
  font-size: 22px;
  font-weight: 800;
}

.map-question {
  color: var(--ink);
  font-size: 42px;
  font-weight: 850;
  line-height: 1.12;
  text-align: center;
}

.map-sequence {
  display: grid;
  grid-template-columns: repeat(8, minmax(76px, 1fr));
  gap: 12px;
  width: min(820px, 100%);
}

.map-cell {
  display: grid;
  gap: 8px;
  justify-items: center;
}

.map-degree {
  color: var(--muted);
  font-size: 20px;
  font-weight: 850;
}

.map-input {
  width: 100%;
  min-height: 54px;
  min-width: 0;
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 28px;
  font-weight: 800;
  text-align: center;
}

.map-input:focus {
  border-color: var(--blue);
  outline: 0;
}

.map-input.correct {
  border-color: var(--green);
  background: #edfdf2;
}

.map-input.wrong {
  border-color: var(--red);
  background: #fff1f1;
}

.map-review {
  display: grid;
  gap: 14px;
  width: 100%;
  overflow-x: auto;
}

.map-review h2 {
  margin: 0;
  color: var(--ink);
  font-size: 28px;
  font-weight: 850;
  text-align: center;
}

.map-review-table {
  width: min(980px, 100%);
  margin: 0 auto;
  border-collapse: collapse;
  background: var(--panel);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 28px;
}

.map-review-table th,
.map-review-table td {
  min-width: 82px;
  padding: 10px 12px;
  border: 1.5px solid #111827;
  text-align: center;
}

.map-review-table th {
  background: #e8eef6;
  font-weight: 800;
}


.staff-quiz {
  display: grid;
  gap: 26px;
  justify-items: center;
  padding: 8px 0 4px;
}

.staff-quiz[hidden] {
  display: none;
}

.staff-choice-panel,
.staff-write-section,
.staff-review-panel {
  display: grid;
  gap: 14px;
  justify-items: center;
  width: 100%;
}

.staff-review-panel {
  overflow-x: auto;
  justify-items: start;
}

.staff-svg {
  display: block;
  width: min(100%, 980px);
  height: auto;
  overflow: visible;
}

.staff-lines-glyph,
.staff-clef,
.staff-notehead {
  fill: #000000;
  font-family: "Bravura", "Apple Symbols", "Noto Music", serif;
  font-size: 72px;
  line-height: 1;
}

.staff-lines-glyph {
  dominant-baseline: alphabetic;
}

.staff-ledger,
.staff-note-line {
  stroke: #111827;
  stroke-width: 2.2;
  stroke-linecap: square;
}

.staff-clef,
.staff-notehead {
  text-anchor: middle;
  dominant-baseline: central;
}

.staff-clef-treble,
.staff-clef-bass,
.staff-notehead {
  font-size: 72px;
}

.staff-note-line {
  pointer-events: none;
  stroke-width: 2.2;
}


.staff-octave-mark {
  fill: #000000;
  stroke: #000000;
  stroke-width: 1.8;
  stroke-linecap: square;
}

.staff-octave-mark text {
  stroke: none;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 22px;
  font-style: italic;
  font-weight: 800;
}

.staff-accidental {
  fill: #000000;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 34px;
  font-weight: 800;
  text-anchor: middle;
}

.staff-review-label {
  fill: #000000;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 22px;
  font-weight: 800;
}

.staff-answer-row {
  position: relative;
  width: min(980px, 100%);
  min-height: 58px;
}

.staff-input {
  position: absolute;
  top: 0;
  width: clamp(64px, 8vw, 88px);
  min-height: 50px;
  min-width: 0;
  transform: translateX(-50%);
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 25px;
  font-weight: 800;
  text-align: center;
}

.staff-input:focus {
  border-color: var(--blue);
  outline: 0;
}

.staff-input.correct {
  border-color: var(--green);
  background: #edfdf2;
}

.staff-input.wrong {
  border-color: var(--red);
  background: #fff1f1;
}

.solfege-panel {
  display: grid;
  justify-items: center;
  gap: 16px;
  min-height: 230px;
  padding: 34px 18px;
  text-align: center;
}

.solfege-panel[hidden] {
  display: none;
}

.solfege-panel h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.1;
}

.solfege-panel p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.launch-link {
  display: inline-grid;
  place-items: center;
  min-height: 54px;
  padding: 12px 24px;
  border-radius: 8px;
  background: #1f2937;
  color: white;
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.launch-link:hover {
  background: #111827;
}

.solfege-command {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.white-key,
.black-key {
  cursor: pointer;
  transition:
    fill 120ms ease,
    filter 120ms ease;
}

.white-key:hover {
  fill: #f5f7fb;
}

.black-key:hover {
  filter: brightness(1.35);
}

.key-target {
  fill: var(--accent) !important;
}

.key-correct {
  fill: #8ddf9c !important;
}

.key-wrong {
  fill: #ff9b9b !important;
}

.label-white {
  fill: #111827;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 24px;
}

.label-black {
  fill: #ffffff;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 15px;
}

.label-target {
  fill: #111827;
}

.advanced-label {
  fill: #ef3b2d;
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 13px;
}

.answer-panel {
  display: grid;
  gap: 16px;
  justify-items: center;
  margin-top: 22px;
}

.choices {
  display: grid;
  grid-template-columns: repeat(4, minmax(100px, 1fr));
  gap: 12px;
  width: min(760px, 100%);
}

.typed-answer {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 12px;
  width: min(620px, 100%);
}

.typed-answer[hidden] {
  display: none;
}

.typed-answer input {
  min-height: 62px;
  min-width: 0;
  padding: 10px 16px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 28px;
  font-weight: 800;
  text-align: center;
}

.typed-answer input:focus {
  border-color: var(--blue);
  outline: 0;
}

.choice-button,
.next-button,
.submit-button {
  border: 0;
  border-radius: 8px;
  font-weight: 800;
  cursor: pointer;
}

.choice-button {
  min-height: 62px;
  padding: 12px 16px;
  background: var(--panel);
  border: 2px solid var(--line);
  color: var(--ink);
  font-family: "Times New Roman", "STIX Two Text", serif;
  font-size: 28px;
}

.choice-button:hover {
  border-color: var(--blue);
}

.choice-button.correct {
  border-color: var(--green);
  background: #edfdf2;
}

.choice-button.wrong {
  border-color: var(--red);
  background: #fff1f1;
}

.choice-button:disabled {
  cursor: default;
}

.feedback {
  min-height: 34px;
  color: var(--muted);
  font-size: 22px;
  font-weight: 800;
  text-align: center;
}

.feedback.good {
  color: var(--green);
}

.feedback.bad {
  color: var(--red);
}

.next-button,
.submit-button {
  min-width: 180px;
  min-height: 58px;
  padding: 14px 30px;
  background: #1f2937;
  color: white;
  font-size: 24px;
}

.next-button:hover,
.submit-button:hover {
  background: #111827;
}

.submit-button:disabled {
  cursor: default;
  opacity: 0.65;
}

@media (max-width: 840px) {
  body {
    -webkit-text-size-adjust: 100%;
  }

  .app {
    width: 100%;
    padding: max(14px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(22px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  }

  .topbar {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
  }

  h1 {
    margin: 0;
    font-size: 30px;
  }

  .score {
    min-width: 74px;
    padding: 10px 12px;
  }

  .score span:first-child {
    font-size: 28px;
  }

  .controls {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 12px;
  }

  legend {
    margin-bottom: 6px;
  }

  .segmented {
    grid-auto-flow: column;
    grid-auto-columns: minmax(104px, max-content);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .segmented::-webkit-scrollbar {
    display: none;
  }

  .segmented span {
    min-width: 104px;
    min-height: 48px;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 10px 14px;
    white-space: nowrap;
  }

  .segmented label:first-child span {
    border-left: 0;
  }

  .toggle {
    min-height: 48px;
    min-width: 0;
    justify-content: center;
  }

  .board {
    padding: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(24, 31, 43, 0.1);
  }

  #prompt {
    min-height: 54px;
    margin-bottom: 10px;
    padding: 6px 8px;
    font-size: 28px;
  }

  .hint {
    margin: -2px 0 12px;
    font-size: 14px;
  }

  .keyboard,
  .staff-write-section,
  .staff-choice-panel,
  .staff-review-panel,
  .map-review {
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
  }

  .keyboard svg[aria-label^="Two octave"] {
    width: 720px;
    max-width: none;
  }

  .keyboard svg[aria-label^="Full piano"] {
    width: 1160px;
    max-width: none;
  }

  .staff-write-section .staff-svg,
  .staff-review-panel .staff-svg {
    width: 920px;
    max-width: none;
  }

  .staff-choice-panel .staff-svg {
    width: 560px;
    max-width: none;
  }

  .staff-svg[aria-label*="note reading exercise"] {
    flex: 0 0 auto;
  }

  .staff-answer-row {
    width: 920px;
    max-width: none;
  }

  .map-review-table {
    width: 820px;
    max-width: none;
  }

  .interval-grid {
    grid-template-columns: repeat(3, minmax(86px, 1fr));
    gap: 12px;
  }

  .interval-note {
    min-height: 46px;
    font-size: 34px;
  }

  .interval-input,
  .map-input,
  .staff-input,
  .typed-answer input {
    min-height: 52px;
    font-size: 24px;
  }

  .map-sequence {
    grid-template-columns: repeat(4, minmax(72px, 1fr));
    gap: 10px;
  }

  .typed-answer {
    grid-template-columns: 1fr;
  }

  .choices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .choice-button,
  .next-button,
  .submit-button {
    min-height: 56px;
    touch-action: manipulation;
  }

  .choice-button {
    padding: 10px 12px;
    font-size: 25px;
  }

  .staff-review-label {
    font-size: 21px;
  }
}

@media (max-width: 520px) {
  .app {
    padding-right: max(10px, env(safe-area-inset-right));
    padding-left: max(10px, env(safe-area-inset-left));
  }

  .topbar {
    grid-template-columns: 1fr;
  }

  .score {
    justify-self: start;
  }

  .controls {
    gap: 9px;
  }

  .segmented {
    grid-auto-columns: minmax(96px, max-content);
  }

  .segmented span {
    min-width: 96px;
    min-height: 46px;
    padding: 9px 12px;
    font-size: 14px;
  }

  .toggle {
    min-height: 46px;
    font-size: 14px;
  }

  .feedback {
    font-size: 18px;
  }

  .board {
    padding: 10px;
  }

  #prompt {
    font-size: 24px;
  }

  .keyboard svg[aria-label^="Two octave"] {
    width: 640px;
  }

  .keyboard svg[aria-label^="Full piano"] {
    width: 1080px;
  }

  .staff-write-section .staff-svg,
  .staff-review-panel .staff-svg,
  .staff-answer-row {
    width: 840px;
  }

  .staff-choice-panel .staff-svg {
    width: 560px;
  }

  .interval-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .interval-note {
    font-size: 34px;
  }

  .map-sequence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .map-question {
    font-size: 32px;
  }

  .choices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .choice-button,
  .staff-input {
    font-size: 22px;
  }
}