/* /arrange — record a melody, ask for a backing, play along. Same restrained black/white
 * neubrutalist tool aesthetic as the existing Cadence page: hairline rules, zero radius, ink on
 * paper. Track identity in the piano roll is the one place color carries meaning (the dataviz
 * categorical palette, slots 1-4) — everything else stays monochrome. */

:root {
  --bg: #fff;
  --paper: #fff;
  --ink: #0d0d0d;
  --muted: #5f5f5f;
  --line: #111;
  --grid: #d6d6d6;
  --wash: #efefef;
  --onaccent: #fff;
  --key-white: #fafafa;
  --key-white-ink: #202020;
  --key-black: #141414;
  --key-black-ink: #f5f5f5;
  --key-pressed: #bcbcbc;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --paper: #0a0a0a;
    --ink: #f2f2f2;
    --muted: #a0a0a0;
    --line: #f2f2f2;
    --grid: #333;
    --wash: #1a1a1a;
    --onaccent: #0a0a0a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --paper: #0a0a0a;
  --ink: #f2f2f2;
  --muted: #a0a0a0;
  --line: #f2f2f2;
  --grid: #333;
  --wash: #1a1a1a;
  --onaccent: #0a0a0a;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: "Libre Franklin", system-ui, sans-serif; padding-inline: clamp(16px, 4vw, 48px); line-height: 1.5; }
main { max-width: 980px; margin: auto; padding-block: 32px 56px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 30px; }
main > *, section.card > * { min-width: 0; }
h1 { font-size: clamp(1.55rem, 4vw, 2.05rem); letter-spacing: -0.03em; margin: 4px 0; text-wrap: balance; }
h2 { font-size: 1.05rem; margin: 0; }
h3 { font-size: 0.95rem; margin: 0; }
p { margin: 0; max-width: 68ch; }
a { color: var(--ink); }
.mono { font-family: "IBM Plex Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); font-size: 0.85rem; }
.meta { font-size: 0.78rem; color: var(--muted); overflow-wrap: anywhere; }
.notice { font-size: 0.83rem; border-left: 3px solid var(--muted); padding-left: 12px; }

header { display: grid; gap: 6px; padding-block: 0 4px; }
header .eyebrow { font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.08em; color: var(--muted); }

button { font: inherit; color: var(--ink); border: 1px solid var(--line); background: var(--paper); border-radius: 0; padding: 0.55rem 0.85rem; cursor: pointer; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
button[aria-pressed="true"] { background: var(--ink); color: var(--onaccent); border-color: var(--ink); }

section.card { min-width: 0; border: 1px solid var(--line); padding: 20px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }

.banner { border: 1px solid var(--line); background: var(--wash); padding: 10px 14px; font-size: 0.85rem; }
.banner.fixture { border-style: dashed; font-family: "IBM Plex Mono", monospace; font-weight: 600; letter-spacing: 0.02em; }

.piano { position: relative; height: 140px; display: flex; border: 1px solid var(--line); touch-action: none; user-select: none; -webkit-user-select: none; }
.wkey { flex: 1 0 0; min-width: 0; border-right: 1px solid var(--line); display: flex; align-items: flex-end; justify-content: center; padding-bottom: 6px; font-size: 9px; color: var(--key-white-ink); background: var(--key-white); font-family: "IBM Plex Mono", monospace; }
.wkey:last-child { border-right: 0; }
.wkey.active { background: var(--key-pressed); }
.bkey { position: absolute; top: 0; height: 62%; background: var(--key-black); color: var(--key-black-ink); border: 1px solid var(--key-black); display: flex; align-items: flex-end; justify-content: center; padding-bottom: 5px; font-size: 8px; font-family: "IBM Plex Mono", monospace; }
.bkey.active { background: var(--muted); border-color: var(--muted); }
.keylegend { font-size: 0.72rem; color: var(--muted); max-width: 78ch; }

.import-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.import-row input[type="file"] { font: inherit; min-width: 0; width: 100%; max-width: 100%; }

.toolbar { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.field { display: flex; gap: 6px; align-items: center; font-size: 0.8rem; color: var(--muted); }
.field input[type="number"] { width: 5.5em; font: inherit; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 0; padding: 0.4rem 0.5rem; }

textarea#promptText { width: 100%; min-height: 4.5em; resize: vertical; font: inherit; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 0; padding: 0.6rem 0.7rem; }
.prompt-foot { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--muted); }
.prompt-foot .err { color: var(--ink); font-weight: 700; }

#recStatus, #genStatus, #countInStatus, #midiImportStatus { font-size: 0.83rem; color: var(--muted); min-height: 1.2em; margin: 0; }
#genStatus.status-error { color: var(--ink); font-weight: 700; }
#genStatus.status-busy { font-style: italic; }
#midiImportStatus.err { color: var(--ink); font-weight: 700; }

.roll { background: var(--paper); border: 1px solid var(--line); padding: 10px 10px 4px; overflow: hidden; }
.roll canvas { display: block; width: 100%; height: 190px; max-width: 100%; }

.track-legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.78rem; color: var(--muted); }
.track-chip { display: inline-flex; align-items: center; gap: 6px; }
.track-chip .dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; }

.midi-links { display: flex; gap: 10px; flex-wrap: wrap; }
.midi-links a { font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; padding: 0.5rem 0.7rem; border: 1px solid var(--line); text-decoration: none; }
.midi-links a.disabled { opacity: 0.45; pointer-events: none; }

#commentaryBlock { display: grid; gap: 6px; font-size: 0.92rem; }
#commentaryBlock .meta { margin-top: 2px; }

footer { color: var(--muted); font-size: 0.73rem; border-top: 1px solid var(--line); padding-top: 16px; display: grid; gap: 4px; }

@media (max-width: 650px) {
  .piano { height: 112px; }
  .wkey { font-size: 8px; }
  .bkey { font-size: 7px; }
  .roll canvas { height: 160px; }
  section.card { padding: 14px; }
}