:root {
  color-scheme: dark;
  font-family: Arial, sans-serif;
  background: #090b0f;
  color: #dce1ea;
  --muted: #a0aaba;
  --surface: #11151c;
  --border: #3d4758;
  --accent: #a9c9f4;
  --ink: #0c1320;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
body { margin: 0; padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
button, input { font: inherit; }
button { touch-action: manipulation; min-width: 52px; min-height: 52px; border: 1px solid var(--border); border-radius: 0; background: transparent; color: inherit; padding: 12px 16px; cursor: pointer; overflow-wrap: anywhere; }
button:hover { border-color: var(--accent); background: #19212e; }
button:disabled { opacity: .45; cursor: not-allowed; }
button[aria-selected="true"], button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: #172235; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.header { position: relative; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; max-width: 900px; margin: auto; padding: 30px 24px; }
.header::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(0deg, transparent 0 7px, #a9c9f409 7px 8px); mask-image: linear-gradient(90deg, transparent, #000 55%, transparent); pointer-events: none; }
.brand { position: relative; display: flex; flex-wrap: wrap; max-width: 100%; align-items: center; gap: 14px; color: inherit; font: 600 3.6rem/1 var(--mono); letter-spacing: -.09em; text-decoration: none; }
.brand-logo { display: block; width: 50px; height: auto; flex: none; }
.brand-signature { display: block; width: 125px; height: auto; flex: none; }
.brand-word { display: inline-block; position: relative; font-size: clamp(1.5rem, 8vw, 3.6rem); }
.brand-word::after { content: attr(data-text); position: absolute; inset: 0; color: var(--accent); clip-path: polygon(0 29%, 100% 29%, 100% 34%, 0 34%, 0 66%, 100% 66%, 100% 70%, 0 70%); transform: translateX(4px); pointer-events: none; }
#offline-status { position: relative; color: var(--muted); font-size: .8rem; max-width: 45%; }
main { max-width: 900px; margin: auto; padding: 0 24px 24px; }
.tabs { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 2; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); background: #090b0f; border-block: 1px solid var(--border); }
.tabs button { min-height: 60px; border: 0; border-bottom: 2px solid transparent; padding: 12px 4px; background: transparent; }
.tabs button + button { border-left: 1px solid var(--border); }
.tabs button[aria-selected="true"] { background: transparent; border-bottom-color: var(--accent); }
[role="tabpanel"] { min-width: 0; padding-top: 24px; }
label, legend { display: block; font-size: .8rem; margin-bottom: 10px; overflow-wrap: anywhere; }
input { width: 100%; min-height: 56px; background: var(--surface); color: inherit; border: 0; border-bottom: 1px solid var(--accent); border-radius: 0; padding: 14px; font: 1.3rem var(--mono); }
input[aria-invalid="true"] { border-color: #eba6a0; }
.hint { font-size: .8rem; color: var(--muted); }
.hint:empty, .error:empty { display: none; }
.error { color: #eba6a0; font-size: .875rem; line-height: 1.6; }
.transpose-controls { display: grid; grid-template-columns: 64px 1fr 64px; align-items: center; text-align: center; gap: 16px; margin: 20px 0 8px; max-width: 320px; }
.step { height: 64px; font: 2rem var(--mono); }
#transpose-offset { font: 2rem var(--mono); }
.actions { display: flex; gap: 8px; }
.secondary { font-size: .85rem; border-color: transparent; padding-inline: 12px; }
.result { border-top: 1px solid var(--border); padding-top: 24px; margin-top: 24px; }
.transpose-output { display: block; font: 2rem/1.5 var(--mono); color: var(--accent); white-space: pre-wrap; overflow-wrap: anywhere; }
.chord-picker { margin-top: 24px; }
.song-keys { display: flex; flex-wrap: wrap; gap: 8px; }
.song-suggestions { margin-top: 24px; }
.song-suggestions h2 { font-size: 1rem; font-weight: 400; color: var(--muted); }
.song-proposals { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; }
.song-progression { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--border); font: 1rem/1.7 var(--mono); color: var(--accent); overflow-wrap: anywhere; }
.song-progression span { min-width: 0; }
.song-progression button { flex: none; width: 52px; }
.actions { flex-wrap: wrap; }
#storage-status { max-width: 852px; margin: 0 auto; padding: 0 14px; }
.chord-groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin: 8px 0 12px; }
.chord-groups button { font-size: .8rem; padding-inline: 4px; }
.chord-types { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.chord-types button { font: .85rem var(--mono); padding-inline: 4px; overflow-wrap: anywhere; }
.chord-inspector { margin-top: 24px; padding: 24px; background: var(--surface); border-left: 2px solid var(--accent); }
.chord-inspector h2 { margin: 0 0 20px; font: 1.3rem Arial, sans-serif; color: var(--accent); }
.chord-tone-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 12px; }
.chord-tone { display: flex; flex-direction: column; gap: 10px; padding: 16px 12px; border: 1px solid var(--border); }
.chord-tone strong { font: 2rem var(--mono); }
.chord-tone span { font: 1rem Arial, sans-serif; }
.chord-tone small { font: .75rem Arial, sans-serif; color: var(--muted); }
.chord-tone.root-tone { border-color: var(--accent); }
.chord-tone.root-tone strong { color: var(--accent); }
.piano-example { margin-top: 16px; border-top: 1px solid var(--border); }
.piano-example summary { min-height: 52px; padding: 16px 0; cursor: pointer; touch-action: manipulation; }
.piano-hands { display: grid; grid-template-columns: 8fr 15fr; gap: 20px; margin-block: 20px; }
.piano-hand { min-width: 0; --hand-color: var(--accent); }
.piano-chord { --hand-color: #bfb4ed; }
.piano-hand h3 { margin: 0 0 12px; font-size: .85rem; font-weight: 400; color: var(--hand-color); overflow-wrap: anywhere; }
.piano-keyboard { position: relative; width: 100%; height: 174px; }
.piano-key { position: absolute; top: 0; border: 1px solid #11151c; }
.white-key { height: 144px; background: #626e80; }
.black-key { z-index: 1; height: 90px; background: #090b0f; border-color: #090b0f; }
.piano-key.marked-key { background: var(--hand-color); }
.piano-key-marker { position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%); width: min(10px, 75%); aspect-ratio: 1; border-radius: 50%; background: var(--ink); }
.piano-key-label { position: absolute; top: 150px; left: 50%; transform: translateX(-50%); font: .65rem/1.2 var(--mono); color: var(--muted); white-space: nowrap; }
.piano-key:first-child .piano-key-label { left: 3px; transform: none; }
.piano-key:last-child .piano-key-label { left: auto; right: 3px; transform: none; }
fieldset { min-width: 0; border: 0; padding: 0; margin: 0 0 20px; }
.note-picker { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; }
.note-picker button { font: .85rem var(--mono); padding-inline: 2px; }
.scale-picker { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
.scale-picker button { text-align: left; font-size: .85rem; }
.scale-notes { display: flex; flex-wrap: wrap; gap: 20px; }
.note { min-width: 40px; padding-bottom: 10px; border-bottom: 1px solid var(--border); font: 1.8rem var(--mono); }
.note strong { font-weight: 400; }
.note small { display: block; margin-top: 8px; font: .7rem var(--mono); color: var(--muted); }
.note.root-note { color: var(--accent); border-color: var(--accent); }
.rhythm-tracks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.track-control { display: grid; grid-template-columns: 24px minmax(0, 1fr) 52px 52px; align-items: end; gap: 6px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.track-control strong { color: var(--lane-color); font: 1rem var(--mono); align-self: center; }
.track-control label { margin: 0; color: var(--muted); }
.track-control input { margin-top: 6px; padding-inline: 8px; }
.track-control button { padding-inline: 0; }
.track-control button[aria-pressed="true"] { color: var(--lane-color); border-color: var(--lane-color); }
.track-mute { grid-column: 1 / -1; justify-self: start; }
.track-steps { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(52px, 1fr)); gap: 6px; }
.track-steps button[aria-pressed="true"] { color: var(--ink); background: var(--lane-color); border-color: var(--lane-color); }
.muted-track .tick.hit, .muted-track .track-steps button[aria-pressed="true"] { background: var(--surface); color: var(--lane-color); border-style: dashed; }
.rhythm-tempo { max-width: 180px; margin-top: 16px; }
.snare-controls { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 16px; }
.snare-controls span { font-size: .8rem; color: var(--muted); margin-right: 6px; }
.snare-controls button { padding-inline: 10px; font-size: .85rem; }
.rhythm-grid { display: grid; gap: 10px; min-width: 0; }
.rhythm-row, .rhythm-axis { display: grid; grid-template-columns: 24px repeat(var(--steps), minmax(0, 1fr)); gap: 4px; align-items: start; }
.rhythm-axis { color: var(--muted); text-align: center; font: .65rem var(--mono); overflow-wrap: anywhere; }
.rhythm-row strong { align-self: center; color: var(--lane-color); font: .85rem var(--mono); }
.rhythm-cell { min-width: 0; }
.rhythm-cell small { display: block; margin-top: 6px; text-align: center; font: .65rem var(--mono); color: var(--muted); }
.tick { height: 44px; display: grid; place-items: center; background: var(--surface); color: var(--muted); font: .8rem var(--mono); border: 1px solid var(--border); }
.lane-1 { --lane-color: #a9c9f4; }
.lane-2 { --lane-color: #bfb4ed; }
.lane-3 { --lane-color: #a6d7c7; }
.lane-4 { --lane-color: #e8b6ca; }
.lane-5 { --lane-color: #cbd797; }
.lane-6 { --lane-color: #accddb; }
.tick.hit { background: var(--lane-color); color: var(--ink); border-color: var(--lane-color); font-weight: 700; }
.tick.shared { box-shadow: inset 0 -4px 0 #090b0f; }
.cycle-end .tick { border-style: dashed; background: transparent; color: var(--lane-color); }
.tick.playing { outline: 2px solid #fff; outline-offset: 2px; }
.rhythm-pages { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; }
.rhythm-pages output { color: var(--muted); font: .85rem var(--mono); }
#rhythm-coincidences { color: var(--accent); font: .85rem/1.6 var(--mono); margin: 16px 0 0; overflow-wrap: anywhere; }
@media (max-width: 540px) {
  .song-proposals { grid-template-columns: 1fr; }
  .header { padding: 24px 14px; }
  .brand { font-size: 2.8rem; gap: 6px; }
  .brand-signature { width: 110px; }
  main { padding-inline: 14px; }
  .tabs { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .tabs button { grid-column: span 2; min-height: 52px; font-size: .8rem; }
  .tabs button:nth-child(n+4) { grid-column: span 3; }
  .chord-inspector { padding: 20px 12px; }
}
@media (max-width: 700px) {
  .rhythm-tracks { grid-template-columns: 1fr; }
  .piano-hands { grid-template-columns: 1fr; gap: 16px; }
  .piano-bass { max-width: 320px; }
}
@media (max-width: 360px) {
  .note-picker { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: no-preference) {
  button { transition: border-color .15s, background-color .15s; }
}