:root {
  --paper: oklch(93.5% 0.025 84);
  --paper-deep: oklch(89% 0.035 82);
  --paper-light: oklch(97% 0.018 87);
  --ink: oklch(23% 0.025 64);
  --ink-soft: oklch(43% 0.03 68);
  --rule: oklch(76% 0.035 78);
  --accent: oklch(57% 0.19 38);
  --accent-dark: oklch(42% 0.145 36);
  --green: oklch(55% 0.095 151);
  --danger: oklch(52% 0.18 28);
  --font-body: "Manrope", "Avenir Next", sans-serif;
  --font-display: "Newsreader", Georgia, serif;
  --font-data: "DM Mono", "SFMono-Regular", monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0 49.94%, oklch(78% 0.025 80 / 0.22) 50%, transparent 50.06%) 0 0 / 48px 48px,
    linear-gradient(transparent 0 49.94%, oklch(78% 0.025 80 / 0.18) 50%, transparent 50.06%) 0 0 / 48px 48px,
    var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  font-kerning: normal;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

button, select, input { font: inherit; }
button { color: inherit; }

button:focus-visible, select:focus-visible, label:has(input:focus-visible) {
  outline: 3px solid oklch(57% 0.19 38 / 0.45);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 50;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 16px;
  color: var(--paper-light);
  background: var(--ink);
  transition: transform 180ms var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 76px;
  padding: 0 clamp(20px, 4vw, 72px);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  color: inherit;
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.035em;
}
.wordmark svg { width: 28px; height: 28px; }
.wordmark path { fill: none; stroke: var(--accent); stroke-width: 2.2; }

.edition {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.edition span { color: var(--accent); margin: 0 7px; }

.method-chip {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.method-chip i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px oklch(55% 0.095 151 / 0.14);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1.65fr);
  grid-template-areas: "intro intro" "source transcription" "ledger ledger";
  max-width: 1540px;
  margin: 0 auto;
  padding: clamp(44px, 7vw, 112px) clamp(20px, 4vw, 72px) 96px;
}

.intro {
  grid-area: intro;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(260px, 0.72fr);
  column-gap: clamp(40px, 9vw, 140px);
  align-items: end;
  padding-bottom: clamp(48px, 6vw, 92px);
  animation: rise 650ms var(--ease-out) both;
}
.eyebrow {
  grid-column: 1 / -1;
  margin: 0 0 18px;
  color: var(--accent-dark);
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.intro h1 {
  margin: 0 0 -0.1em -0.04em;
  max-width: 14ch;
  font-family: var(--font-display);
  font-size: clamp(3.25rem, 7.25vw, 7.65rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.84;
}
.intro h1 em { color: var(--accent); font-weight: 500; }
.lede {
  margin: 0;
  max-width: 38ch;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  line-height: 1.7;
}

.source-panel, .transcription-panel, .ledger {
  border-top: 1px solid var(--ink);
  animation: rise 650ms 100ms var(--ease-out) both;
}
.source-panel {
  grid-area: source;
  padding: 28px clamp(24px, 3vw, 48px) 44px 0;
  border-right: 1px solid var(--rule);
}
.transcription-panel {
  grid-area: transcription;
  min-width: 0;
  padding: 28px 0 44px clamp(24px, 3vw, 48px);
}
.ledger {
  grid-area: ledger;
  display: grid;
  grid-template-columns: minmax(220px, 0.58fr) minmax(0, 1.42fr);
  gap: clamp(32px, 6vw, 96px);
  padding-top: 28px;
  margin-top: 56px;
  animation-delay: 180ms;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  min-height: 72px;
}
.section-heading > span {
  padding-top: 5px;
  color: var(--accent);
  font-family: var(--font-data);
  font-size: 0.68rem;
}
.section-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.1;
}
.section-heading p { margin: 5px 0 0; color: var(--ink-soft); font-size: 0.78rem; }
.section-heading--wide { align-items: flex-start; }
.analysis-facts {
  display: flex;
  gap: clamp(14px, 2vw, 32px);
  margin-left: auto;
}
.analysis-facts div { display: grid; text-align: right; }
.analysis-facts strong { font-family: var(--font-data); font-size: 1.1rem; font-weight: 500; font-variant-numeric: tabular-nums; }
.analysis-facts span { color: var(--ink-soft); font-size: 0.64rem; letter-spacing: 0.08em; text-transform: uppercase; }

.drop-zone {
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: 14px;
  min-height: 84px;
  margin: 12px 0 16px;
  padding: 15px 18px;
  border: 1px dashed var(--ink-soft);
  cursor: pointer;
  transition: background 160ms var(--ease-out), border-color 160ms var(--ease-out), transform 160ms var(--ease-out);
}
.drop-zone:hover, .drop-zone.is-dragging { background: var(--paper-light); border-color: var(--accent); transform: translateY(-2px); }
.drop-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-zone svg { width: 27px; fill: none; stroke: var(--accent); stroke-width: 1.6; }
.drop-zone span { color: var(--ink-soft); font-size: 0.78rem; }
.drop-zone b { display: block; color: var(--ink); font-size: 0.9rem; }

.file-readout {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--rule);
}
.file-readout > div:nth-child(2) { min-width: 0; }
.file-readout strong, .file-readout span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-readout strong { font-size: 0.86rem; }
.file-readout span { color: var(--ink-soft); font-family: var(--font-data); font-size: 0.65rem; }
.disc { position: relative; width: 34px; height: 34px; border: 1px solid var(--ink); border-radius: 50%; }
.disc::before, .disc::after { content: ""; position: absolute; inset: 5px; border: 1px solid var(--rule); border-radius: 50%; }
.disc::after { inset: 10px; }
.disc i { position: absolute; z-index: 1; top: 50%; left: 50%; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); transform: translate(-50%, -50%); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--rule); }
.status-dot.is-working { background: var(--accent); animation: pulse 1.1s ease-in-out infinite; }
.status-dot.is-ready { background: var(--green); }
.status-dot.is-error { background: var(--danger); }

.analysis-status { padding: 18px 0 14px; }
.status-line { display: flex; justify-content: space-between; gap: 16px; color: var(--ink-soft); font-size: 0.72rem; }
.status-line span:last-child { font-family: var(--font-data); font-variant-numeric: tabular-nums; }
.progress-track { height: 3px; margin-top: 9px; overflow: hidden; background: var(--rule); }
.progress-track i { display: block; width: 0; height: 100%; background: var(--accent); transform-origin: left; transition: width 180ms var(--ease-out); }

.controls-disclosure { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.controls-disclosure summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 48px;
  list-style: none;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
}
.controls-disclosure summary::-webkit-details-marker { display: none; }
.controls-disclosure summary::before { content: "+"; margin-right: 9px; color: var(--accent); font-family: var(--font-data); }
.controls-disclosure[open] summary::before { content: "−"; }
.controls-disclosure summary span { margin-left: auto; color: var(--ink-soft); font-size: 0.64rem; font-weight: 500; }
.control-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px 12px; padding: 4px 0 18px; }
.control-grid label { color: var(--ink-soft); font-size: 0.66rem; font-weight: 600; }
.control-grid select {
  width: 100%; min-height: 40px; margin-top: 5px; padding: 0 9px;
  border: 1px solid var(--rule); border-radius: 0; color: var(--ink); background: var(--paper-light); font-size: 0.72rem;
}
.text-button {
  grid-column: 1 / -1;
  display: flex; justify-content: space-between; align-items: center;
  min-height: 42px; padding: 0; border: 0; border-bottom: 1px solid var(--ink); background: none;
  cursor: pointer; font-size: 0.75rem; font-weight: 700;
}
.text-button:disabled { opacity: 0.4; cursor: not-allowed; }
.text-button svg { width: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; }

.method-note { margin: 20px 0 0; color: var(--ink-soft); font-size: 0.68rem; line-height: 1.65; }
.method-note b { color: var(--ink); }

.transport {
  display: grid;
  grid-template-columns: auto 52px auto 1fr;
  align-items: center;
  gap: 16px;
  min-height: 68px;
  margin: 12px 0 16px;
  padding: 8px 10px 8px 14px;
  color: var(--paper-light);
  background: var(--ink);
}
.mode-switcher { display: flex; align-items: center; gap: 3px; }
.mode-button {
  min-height: 38px; padding: 0 12px; border: 0; color: oklch(76% 0.02 76); background: transparent;
  cursor: pointer; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.02em;
}
.mode-button:hover { color: var(--paper-light); }
.mode-button.is-active { color: var(--ink); background: var(--paper); }
.play-button {
  display: grid; place-items: center; width: 48px; height: 48px; padding: 0; border: 1px solid var(--paper-light); border-radius: 50%;
  color: var(--paper-light); background: transparent; cursor: pointer; transition: transform 120ms var(--ease-out), background 120ms var(--ease-out), color 120ms var(--ease-out);
}
.play-button:hover:not(:disabled) { color: var(--ink); background: var(--paper-light); transform: scale(1.04); }
.play-button:active:not(:disabled) { transform: scale(0.96); }
.play-button:disabled { opacity: 0.35; cursor: not-allowed; }
.play-button svg { width: 21px; height: 21px; fill: currentColor; }
.play-button .play-icon { transform: translateX(1px); }
.play-button .stop-icon, .play-button.is-playing .play-icon { display: none; }
.play-button.is-playing .stop-icon { display: block; }
.time-display { display: flex; gap: 8px; color: oklch(85% 0.02 75); font-family: var(--font-data); font-size: 0.7rem; font-variant-numeric: tabular-nums; }
.time-display i { color: oklch(55% 0.02 70); font-style: normal; }
.download-button {
  justify-self: end; display: flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 15px;
  border: 0; color: var(--paper-light); background: var(--accent-dark); cursor: pointer; font-size: 0.72rem; font-weight: 700;
  transition: background 130ms var(--ease-out);
}
.download-button:hover:not(:disabled) { background: var(--accent); }
.download-button:disabled { opacity: 0.38; cursor: not-allowed; }
.download-button svg { width: 17px; fill: none; stroke: currentColor; stroke-width: 1.6; }

.roll-shell { position: relative; min-height: 392px; border: 1px solid var(--rule); background: var(--paper-light); }
.roll-caption { display: flex; gap: 20px; align-items: center; height: 43px; padding: 0 14px; border-bottom: 1px solid var(--rule); color: var(--ink-soft); font-size: 0.64rem; }
.roll-caption span:first-child { margin-right: auto; color: var(--ink); font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; }
.roll-caption i { display: inline-block; width: 11px; height: 6px; margin-right: 5px; background: var(--accent); }
#piano-roll { display: block; width: 100%; height: 347px; }
.empty-roll { position: absolute; inset: 43px 0 0; display: flex; justify-content: center; align-items: center; gap: 7px; color: var(--ink-soft); font-size: 0.72rem; background: var(--paper-light); }
.empty-roll span { margin-right: 10px; }
.empty-roll i { width: 4px; height: 28px; background: var(--accent); transform-origin: center; animation: meter 800ms ease-in-out infinite alternate; }
.empty-roll i:nth-of-type(2) { height: 48px; animation-delay: -200ms; }
.empty-roll i:nth-of-type(3) { height: 20px; animation-delay: -420ms; }
.empty-roll i:nth-of-type(4) { height: 38px; animation-delay: -120ms; }
.empty-roll i:nth-of-type(5) { height: 14px; animation-delay: -330ms; }
.empty-roll.is-hidden { display: none; }

.ledger-table-wrap { max-height: 430px; overflow: auto; border-bottom: 1px solid var(--rule); }
table { width: 100%; border-collapse: collapse; font-size: 0.77rem; font-variant-numeric: tabular-nums; }
th { position: sticky; z-index: 1; top: 0; padding: 11px 12px; border-bottom: 1px solid var(--ink); color: var(--ink-soft); background: var(--paper); font-size: 0.62rem; font-weight: 600; letter-spacing: 0.08em; text-align: left; text-transform: uppercase; }
td { padding: 14px 12px; border-bottom: 1px solid var(--rule); font-family: var(--font-data); }
tbody tr:not(.empty-row) { cursor: pointer; transition: background 120ms var(--ease-out); }
tbody tr:not(.empty-row):hover, tbody tr:focus { background: var(--paper-light); outline: none; }
td:nth-child(2) { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; }
td:nth-child(2) i { display: inline-block; width: 7px; height: 7px; margin-right: 9px; border-radius: 50%; background: var(--accent); }
.empty-row td { padding: 50px 12px; color: var(--ink-soft); font-family: var(--font-body); text-align: center; }

footer {
  display: flex; justify-content: space-between; gap: 24px; padding: 24px clamp(20px, 4vw, 72px);
  border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 0.68rem;
}
footer p { margin: 0; }
footer span { color: var(--accent-dark); font-family: var(--font-data); text-transform: uppercase; letter-spacing: 0.08em; }

.toast {
  position: fixed; z-index: 20; right: 24px; bottom: 24px; max-width: min(360px, calc(100vw - 48px));
  padding: 13px 16px; color: var(--paper-light); background: var(--ink); font-size: 0.76rem;
  opacity: 0; pointer-events: none; transform: translateY(12px); transition: opacity 240ms var(--ease-out), transform 240ms var(--ease-out);
}
.toast.is-visible { opacity: 1; transform: translateY(0); }

@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 50% { transform: scale(1.7); opacity: 0.5; } }
@keyframes meter { to { transform: scaleY(0.4); } }

@media (max-width: 920px) {
  .masthead { grid-template-columns: 1fr auto; }
  .edition { display: none; }
  .workspace { grid-template-columns: 1fr; grid-template-areas: "intro" "source" "transcription" "ledger"; }
  .intro { grid-template-columns: 1fr; gap: 28px; }
  .source-panel { padding-right: 0; border-right: 0; }
  .transcription-panel { padding: 28px 0 44px; margin-top: 48px; }
  .ledger { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .masthead { min-height: 64px; padding: 0 18px; }
  .method-chip { font-size: 0; }
  .method-chip::after { content: "Local"; font-size: 0.68rem; }
  .workspace { padding: 44px 18px 72px; }
  .intro h1 { font-size: clamp(3rem, 15vw, 5.4rem); }
  .analysis-facts { gap: 12px; }
  .analysis-facts strong { font-size: 0.87rem; }
  .transport { grid-template-columns: 1fr 50px auto; gap: 9px; padding: 10px; }
  .mode-switcher { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid oklch(38% 0.02 70); }
  .mode-button { min-height: 40px; }
  .time-display { font-size: 0.63rem; }
  .download-button { padding: 0 11px; font-size: 0; }
  .download-button::after { content: "MIDI"; font-size: 0.68rem; }
  .roll-caption span:nth-child(2) { display: none; }
  .roll-shell { min-height: 322px; }
  #piano-roll { height: 277px; }
  .empty-roll { inset: 43px 0 0; }
  .ledger-table-wrap { overflow-x: auto; }
  table { min-width: 620px; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}