:root {
  --font-ui: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, 'Times New Roman', serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'SF Mono', Consolas, Menlo, monospace;

  --bg: #f3efe6;
  --bg-elev: #fbf9f4;
  --paper: #fffdf8;
  --line: rgba(29, 31, 40, 0.14);
  --line-strong: rgba(29, 31, 40, 0.28);

  --ink: #1d1f28;
  --ink-dim: #55565f;
  --ink-faint: #83848c;

  --staff: rgba(29, 31, 40, 0.55);
  --staff-strong: rgba(29, 31, 40, 0.75);

  --accent: #9a6b12;
  --accent-soft: rgba(154, 107, 18, 0.14);
  --accent-ink: #fffdf8;
  --live: #0d7a68;
  --live-soft: rgba(13, 122, 104, 0.16);
  --danger: #a33328;

  --key-white: #fffdf8;
  --key-white-edge: rgba(29, 31, 40, 0.22);
  --key-black: #24262f;

  --shadow-sm: 0 1px 2px rgba(29, 31, 40, 0.1);
  --shadow-md: 0 10px 28px -14px rgba(29, 31, 40, 0.4);

  --radius: 12px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

:root[data-theme='dark'] {
  --bg: #101218;
  --bg-elev: #191c24;
  --paper: #1e222b;
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.2);

  --ink: #eeeae1;
  --ink-dim: #a7a69f;
  --ink-faint: #75757c;

  --staff: rgba(238, 234, 225, 0.5);
  --staff-strong: rgba(238, 234, 225, 0.72);

  --accent: #e2ad4d;
  --accent-soft: rgba(226, 173, 77, 0.16);
  --accent-ink: #17140c;
  --live: #4ecdb4;
  --live-soft: rgba(78, 205, 180, 0.18);
  --danger: #e2705f;

  --key-white: #ded9cf;
  --key-white-edge: rgba(0, 0, 0, 0.45);
  --key-black: #14161c;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 14px 34px -16px rgba(0, 0, 0, 0.8);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 20;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem clamp(0.8rem, 0.4rem + 1.5vw, 1.6rem);
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.brand__mark {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 26px;
}

.brand__mark span {
  display: block;
  height: 2px;
  border-radius: 1px;
  background: var(--staff);
}

.brand__mark span:nth-child(2) {
  background: var(--accent);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__text b {
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.brand__text span {
  font-size: 0.75rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

.topbar__tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  overflow: hidden;
}

.lang__btn {
  padding: 0.3rem 0.65rem;
  border: 0;
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  cursor: pointer;
}

.lang__btn[aria-pressed='true'] {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn--icon {
  padding: 0.45rem;
}

.btn--quiet {
  background: transparent;
}

.btn--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}

.btn--accent:hover {
  filter: brightness(1.06);
  color: var(--accent-ink);
}

.btn--ghost {
  background: transparent;
}

.btn--danger:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
}

.icon--stop,
:root .btn .icon--moon {
  display: none;
}

:root[data-theme='dark'] .btn .icon--sun {
  display: none;
}

:root[data-theme='dark'] .btn .icon--moon {
  display: block;
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1rem clamp(0.6rem, 0.3rem + 1.4vw, 1.4rem) 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem 1.4rem;
  padding: 0.7rem 0.9rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.bar__group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bar__group--play {
  margin-left: auto;
}

.bar__label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.seg {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.seg__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  padding: 0.34rem 0.5rem;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.seg__btn:last-child {
  border-right: 0;
}

.seg__btn:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.seg__btn.is-on {
  background: var(--accent);
  color: var(--accent-ink);
}

.seg--small .seg__btn {
  font-size: 0.78rem;
  padding: 0.24rem 0.55rem;
  min-width: 0;
}

.dur-icon {
  width: 17px;
  height: 22px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.34rem 0.6rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.chip.is-on {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.chip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.chip__rest {
  width: 9px;
  height: 15px;
  background: currentColor;
  clip-path: polygon(10% 0, 70% 38%, 15% 62%, 100% 100%, 30% 74%, 85% 46%);
}

.play {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.play.is-on {
  background: var(--live);
  border-color: var(--live);
}

.play.is-on .icon--play {
  display: none;
}

.play.is-on .icon--stop {
  display: block;
}

.knob {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 132px;
}

.knob--narrow {
  min-width: 112px;
}

.knob__label {
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.knob__row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.knob__value {
  min-width: 2.2ch;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-dim);
}

.range {
  flex: 1;
  accent-color: var(--accent);
  width: 100%;
}

.sheet {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.sheet__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.9rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.field__label {
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.select {
  padding: 0.36rem 0.5rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
}

.sheet__status {
  margin: 0 0 0 auto;
  font-size: 0.8rem;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

.sheet__paper {
  max-height: 62vh;
  overflow: auto;
  padding: 0.6rem 0.2rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.score {
  display: block;
  width: 100%;
  height: auto;
  color: var(--ink);
  touch-action: manipulation;
}

.sheet__hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.staff-line {
  stroke: var(--staff);
  stroke-width: 1.1;
}

.ledger {
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
}

.barline {
  stroke: var(--staff-strong);
  stroke-width: 1.4;
}

.barline-final {
  fill: var(--staff-strong);
}

.stem {
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
}

.beam {
  fill: currentColor;
}

.dot {
  fill: currentColor;
}

.meter {
  fill: var(--ink);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  text-anchor: middle;
}

.bar-number {
  fill: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 9px;
}

.event {
  color: var(--ink);
  cursor: pointer;
}

.event__hit {
  fill: transparent;
}

.event:hover {
  color: var(--accent);
}

.event.is-selected {
  color: var(--accent);
}

.event.is-playing {
  color: var(--live);
}

.caret {
  stroke: var(--accent);
  stroke-width: 1.6;
  stroke-dasharray: 4 4;
  opacity: 0.75;
}

.ghost {
  color: var(--accent);
  opacity: 0.32;
  pointer-events: none;
}

.piano-block {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.piano-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.9rem;
}

.piano-block__title {
  font-size: 1.05rem;
}

.piano-block__hint {
  margin: 0;
  flex: 1 1 260px;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.piano-scroll {
  overflow-x: auto;
  padding-bottom: 0.4rem;
}

.piano {
  position: relative;
  height: 132px;
  margin: 0 auto;
  background: var(--key-black);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  padding: 6px 0 0;
}

.piano__whites,
.piano__blacks {
  position: absolute;
  inset: 6px 0 0;
}

.piano__blacks {
  pointer-events: none;
}

.key {
  position: absolute;
  top: 0;
  padding: 0;
  border: 0;
  font: inherit;
  cursor: pointer;
  transition: background 0.09s linear;
}

.key--white {
  height: 126px;
  background: var(--key-white);
  border-right: 1px solid var(--key-white-edge);
  border-radius: 0 0 5px 5px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  color: #6d6a63;
  font-size: 0.66rem;
}

.key--white.key--anchor {
  color: var(--accent);
  font-weight: 600;
}

.key--black {
  height: 78px;
  background: linear-gradient(180deg, #2c2f39, #12141a);
  border-radius: 0 0 4px 4px;
  pointer-events: auto;
  z-index: 2;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.key--white:hover {
  background: #f1ead9;
}

.key--black:hover {
  background: linear-gradient(180deg, #3b3f4b, #1a1d24);
}

.key.is-lit.key--white,
.key.is-hit.key--white {
  background: var(--live);
  color: var(--accent-ink);
}

.key.is-lit.key--black,
.key.is-hit.key--black {
  background: var(--live);
}

.key__label {
  pointer-events: none;
}

.files {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 1fr);
  align-items: center;
  padding: 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.files__title {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.files__lead {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-dim);
}

.files__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.files__status {
  flex-basis: 100%;
  margin: 0.2rem 0 0;
  font-size: 0.8rem;
  color: var(--live);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(10, 11, 15, 0.55);
}

.modal[hidden] {
  display: none;
}

.modal__panel {
  position: relative;
  width: min(640px, 100%);
  max-height: 85vh;
  overflow: auto;
  padding: 1.4rem;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.modal__close {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  padding: 0.35rem;
  border: 0;
  background: transparent;
  color: var(--ink-dim);
  cursor: pointer;
}

.modal__list {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  color: var(--ink-dim);
}

.modal__foot {
  margin: 1rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.footer {
  padding: 1.2rem;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--ink-faint);
  font-size: 0.8rem;
}

.footer p {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

@media (max-width: 860px) {
  .bar__group,
  .bar__group--play {
    flex-wrap: wrap;
  }

  .bar__group--play {
    margin-left: 0;
    width: 100%;
  }

  .knob,
  .knob--narrow {
    min-width: 0;
    flex: 1 1 120px;
  }

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

  .sheet__paper {
    max-height: none;
  }

  .sheet__status {
    margin-left: 0;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .topbar,
  .bar,
  .piano-block,
  .files,
  .sheet__head,
  .sheet__hint,
  .footer,
  .modal,
  .skip-link {
    display: none !important;
  }

  main {
    padding: 0;
    max-width: none;
  }

  .sheet__paper {
    max-height: none;
    overflow: visible;
    border: 0;
    box-shadow: none;
    background: #fff;
  }

  .score {
    color: #000;
  }

  .staff-line,
  .barline {
    stroke: #000;
  }

  .barline-final {
    fill: #000;
  }

  .caret,
  .ghost {
    display: none;
  }

  .event.is-selected,
  .event.is-playing {
    color: #000;
  }
}