:root {
  --bg: #0c1117;
  --panel: #151c24;
  --panel-2: #1d2630;
  --text: #f4f7fb;
  --muted: #aab7c7;
  --line: #334252;
  --cyan: #38c8d4;
  --green: #8bd35f;
  --gold: #f2bd4b;
  --pink: #f06c9b;
  --red: #f25757;
  --shadow: 0 22px 70px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font: 16px/1.45 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(900px 520px at 16% -8%, rgba(56, 200, 212, .18), transparent 62%),
    radial-gradient(760px 540px at 90% 0%, rgba(242, 189, 75, .12), transparent 60%),
    linear-gradient(180deg, #0c1117, #101720 55%, #0d1218);
}

button,
select,
input {
  font: inherit;
}

button,
select {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #202b36;
  color: var(--text);
}

button {
  min-height: 42px;
  padding: .65rem .85rem;
  font-weight: 800;
  cursor: pointer;
}

button:hover,
button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid rgba(56, 200, 212, .85);
  outline-offset: 2px;
}

.primary {
  border-color: rgba(56, 200, 212, .65);
  background: #0f5f70;
}

.shell {
  width: min(1380px, calc(100% - 28px));
  margin: 0 auto;
  padding: 26px 0 34px;
}

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

.back-link {
  color: var(--cyan);
  font-weight: 800;
  text-decoration: none;
}

.eyebrow {
  margin: 0 0 .18rem;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .04em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 4.4rem);
  line-height: .95;
  letter-spacing: 0;
}

.connection {
  justify-self: end;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .4rem .7rem;
  color: var(--muted);
  background: rgba(21, 28, 36, .86);
  font-size: .88rem;
  font-weight: 800;
}

.connection.connected {
  color: #dffbd1;
  border-color: rgba(139, 211, 95, .55);
}

.stage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
}

.lane-panel,
.control-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(21, 28, 36, .92);
  box-shadow: var(--shadow);
}

.lane-panel { overflow: hidden; min-width: 0; }
.keyboard-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 18px 0;
  font-weight: 800;
}
.octave-controls { display: flex; gap: 8px; }
.octave-controls button { width: 42px; padding: 6px; }
button:disabled { opacity: .4; cursor: default; }
.keyboard-help { margin: 8px 18px 14px; color: var(--muted); font-size: .82rem; }
.lane-scroll { overflow-x: auto; }
.keyboard-stage { position: relative; min-width: 1140px; height: 720px; }
#noteCanvas { display: block; width: 100%; height: 100%; }

.control-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  align-items: start;
  align-content: start;
  padding: 1rem;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}

.rate-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .55rem;
}

.metric {
  min-height: 84px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .75rem;
  background: var(--panel-2);
}

.metric strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.metric span,
.field span {
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}

.metric--rate {
  min-height: 70px;
}

.metric--rate strong {
  font-size: 1.18rem;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .55rem;
}

.field {
  display: grid;
  gap: .42rem;
}

.settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .55rem;
}

.settings-modal {
  width: min(440px, calc(100vw - 28px));
  max-height: min(720px, calc(100vh - 28px));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
  color: var(--text);
  background: rgba(21, 28, 36, .98);
  box-shadow: var(--shadow);
}

.settings-modal::backdrop {
  background: rgba(5, 8, 12, .72);
}

.modal-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .75rem;
  align-items: center;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(21, 28, 36, .98);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.icon-button {
  min-width: 42px;
  padding: .45rem;
}

.modal-body {
  display: grid;
  gap: .8rem;
  padding: 1rem;
}

.synth-editor {
  display: grid;
  gap: .7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .8rem;
  background: rgba(16, 24, 32, .7);
}

.is-hidden {
  display: none !important;
}

.field select,
.field input {
  width: 100%;
}

.field select {
  min-height: 42px;
  padding: .55rem .65rem;
}

.field input[type="text"] {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #202b36;
  color: var(--text);
  padding: .55rem .65rem;
}

.field output {
  color: var(--gold);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.judgement {
  min-height: 58px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101820;
  color: var(--gold);
  font-size: 1.35rem;
  font-weight: 950;
  text-align: center;
}

.played-notes {
  display: grid;
  gap: .55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .75rem;
  background: #101820;
}

.played-notes h2 {
  margin: 0;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 900;
}

.recent {
  min-height: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  align-content: flex-start;
}

.note-pill {
  display: inline-grid;
  place-items: center;
  min-width: 54px;
  min-height: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #202b36;
  color: var(--text);
  padding: .18rem .42rem;
  font-size: .84rem;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.keyboard-map-panel {
  display: grid;
  gap: .6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .8rem;
  background: rgba(16, 24, 32, .64);
}

.keyboard-map-panel h3 {
  margin: 0;
  font-size: 1rem;
}

.keyboard-board {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 18px;
}
.hit-line {
  position: absolute;
  top: -48px;
  left: 0;
  right: 0;
  height: 4px;
  transform: translateY(-50%);
  background: var(--gold);
  box-shadow: 0 0 12px rgba(242, 189, 75, .55);
  pointer-events: none;
  z-index: 1;
}
.hit-line span {
  position: absolute;
  bottom: 12px;
  left: 0;
  padding: 3px 8px;
  border: 1px solid rgba(242, 189, 75, .6);
  border-radius: 5px;
  background: #111923;
  color: #ffe4a3;
  font-size: 12px;
  font-weight: 800;
}
.key-map {
  position: relative;
  display: grid;
  grid-template-columns: repeat(30, minmax(0, 1fr));
  grid-template-rows: repeat(3, 58px);
  gap: 16px 6px;
  pointer-events: none;
}
.music-key {
  display: grid;
  place-content: center;
  gap: 3px;
  padding: 3px 0;
  min-width: 0;
  min-height: 58px;
  border: 1px solid color-mix(in srgb, var(--key-color), white 20%);
  background: color-mix(in srgb, var(--key-color) 20%, #111923);
  pointer-events: auto;
  touch-action: none;
}
.music-key strong { font-size: 14px; }
.music-key small { font-size: 10px; color: var(--muted); }
.music-key[aria-pressed="true"] {
  background: color-mix(in srgb, var(--key-color) 70%, #111923);
  color: #071015;
  box-shadow: 0 0 18px color-mix(in srgb, var(--key-color) 45%, transparent);
}
.music-key[aria-pressed="true"] small { color: #071015; }

@media (max-width: 980px) {
  .topbar,
  .stage-grid {
    grid-template-columns: 1fr;
  }

  .connection {
    justify-self: start;
  }

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

@media (max-width: 620px) {
  .shell {
    width: min(100% - 18px, 1380px);
    padding-top: 16px;
  }

  .score-grid,
  .button-row {
    grid-template-columns: 1fr 1fr;
  }

  .control-panel { grid-template-columns: 1fr; }
  .keyboard-stage { height: 540px; }
  .keyboard-toolbar { font-size: .82rem; }
}

.synth-modal { width: min(720px, calc(100vw - 28px)); }
.synth-note-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: end; }
.synth-waveform { display: flex; flex-wrap: wrap; gap: 6px; }
.synth-waveform button { flex: 1; padding: 8px; }
.synth-waveform button[aria-pressed="true"] { border-color: var(--cyan); background: #0f5f70; }
[data-synth-wave-canvas] { display: block; width: 100%; height: 120px; border: 1px solid var(--line); border-radius: 6px; background: #0c1117; touch-action: none; cursor: crosshair; }
.synth-envelope { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.synth-control { display: grid; gap: 8px; border: 1px solid var(--line); border-radius: 6px; padding: 10px; }
.synth-control > span { display: flex; justify-content: space-between; color: var(--muted); font-size: .82rem; gap: 8px; }
.synth-control output { color: var(--text); }
.synth-control input { width: 100%; margin: 0; }
.synth-help { margin: 0; color: var(--muted); font-size: .82rem; }
@media (max-width: 620px) { .synth-envelope { grid-template-columns: 1fr; } }

.song-controls { display: grid; grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr) auto; gap: 12px 18px; align-items: center; margin: 0 18px 16px; padding: 14px; border: 1px solid var(--line); border-radius: 6px; background: #111923; }
.guide-toggle { display: flex; align-items: center; gap: 8px; font-size: .82rem; font-weight: 800; }
.guide-toggle input { width: 18px; height: 18px; accent-color: var(--cyan); }
.song-description, .song-playback { grid-column: 1 / -1; color: var(--muted); font-size: .82rem; }
.song-playback { display: flex; align-items: center; gap: 16px; }
.song-playback progress { margin-left: auto; width: min(280px, 40%); accent-color: var(--cyan); }
.music-key.song-key { border-color: #fff; box-shadow: 0 0 12px color-mix(in srgb, var(--key-color) 30%, transparent); }
@media (max-width: 620px) { .song-controls { grid-template-columns: 1fr; } .song-playback { flex-wrap: wrap; } .song-playback progress { margin-left: 0; width: 100%; } }

.song-controls > .button-row { grid-column: 1 / -1; width: min(380px, 100%); }

.guide-toggle[hidden] { display: none; }