:root {
  --font-ui: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --bg: #0c0e14;
  --surface: #151824;
  --surface-2: #1c2032;
  --surface-3: #252a3f;

  --ink: #e7ecf7;
  --ink-dim: rgba(231, 236, 247, 0.66);
  --ink-faint: rgba(231, 236, 247, 0.4);
  --line: rgba(231, 236, 247, 0.12);
  --line-soft: rgba(231, 236, 247, 0.06);

  --accent: #7cc4ff;
  --accent-ink: #08111c;
  --danger: #ff7a9c;

  --wrap: 1180px;
  --gutter: clamp(0.9rem, 0.5rem + 1.8vw, 2rem);

  --r-sm: 7px;
  --r-md: 12px;
  --r-lg: 20px;

  --ease: cubic-bezier(0.22, 0.8, 0.28, 1);
}

[data-instrument='piano'] { --tone: #7cc4ff; }
[data-instrument='guitar'] { --tone: #ffb45c; }
[data-instrument='bell'] { --tone: #7ef0cf; }
[data-instrument='bass'] { --tone: #b492ff; }
[data-instrument='drums'] { --tone: #ff7a9c; }

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: clamp(0.95rem, 0.92rem + 0.15vw, 1.02rem);
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;

  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(124, 196, 255, 0.13), transparent 70%),
    var(--bg);
  min-height: 100svh;
}

body.is-locked {
  overflow: hidden;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

p { margin: 0; }
a { color: inherit; }

button {
  font: inherit;
  color: inherit;
}

svg { display: block; }

.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  transform: translateY(-160%);
  transition: transform 0.25s var(--ease);
}

.skip-link:focus-visible {
  transform: none;
}

main {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-bottom: 3rem;
  display: grid;
  gap: clamp(1rem, 0.6rem + 1.4vw, 1.8rem);
}

main > * {
  min-width: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.62rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease),
    color 0.18s var(--ease);
}

.btn:hover {
  border-color: var(--ink-faint);
}

.btn--quiet {
  background: transparent;
}

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

.btn--accent:hover {
  background: #9bd2ff;
}

.btn--ghost {
  background: transparent;
}

.btn--danger:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.btn.is-on {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--rec.is-on {
  border-color: var(--danger);
  color: var(--danger);
  animation: rec-pulse 1.6s ease-in-out infinite;
}

@keyframes rec-pulse {
  50% { background: rgba(255, 122, 156, 0.14); }
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-block: 1rem;
}

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

.brand__mark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  width: 38px;
  height: 38px;
  padding: 8px 7px;
  border-radius: var(--r-sm);
  background: var(--surface-2);
}

.brand__mark span {
  flex: 1;
  border-radius: 2px;
  background: var(--accent);
  animation: eq 1.4s ease-in-out infinite;
}

.brand__mark span:nth-child(1) { height: 40%; animation-delay: 0s; }
.brand__mark span:nth-child(2) { height: 90%; animation-delay: 0.18s; }
.brand__mark span:nth-child(3) { height: 60%; animation-delay: 0.36s; }
.brand__mark span:nth-child(4) { height: 100%; animation-delay: 0.1s; }

@keyframes eq {
  0%, 100% { transform: scaleY(0.45); }
  50% { transform: scaleY(1); }
}

.brand__mark span {
  transform-origin: bottom;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__text b {
  font-size: 1.1rem;
  font-weight: 700;
}

.brand__text span {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

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

.lang {
  display: flex;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.lang__btn {
  padding: 0.28rem 0.6rem;
  border: 0;
  border-radius: 5px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-faint);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

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

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(0.7rem, 2vw, 1.5rem);
  padding: clamp(0.8rem, 2vw, 1.1rem) clamp(0.9rem, 2vw, 1.3rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
}

.play {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1.4rem;
  border: 0;
  border-radius: var(--r-sm);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  cursor: pointer;
  transition: background 0.18s var(--ease);
}

.play:hover {
  background: #9bd2ff;
}

.play.is-playing {
  background: var(--danger);
}

.play .icon--stop { display: none; }
.play.is-playing .icon--play { display: none; }
.play.is-playing .icon--stop { display: block; }

.knob {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 148px;
}

.knob__label {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.knob__row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.knob__value {
  min-width: 2.4ch;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: right;
}

.range {
  flex: 1;
  min-width: 0;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 2px;
  background: var(--surface-3);
  cursor: pointer;
}

.range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 15px;
  height: 15px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.range::-moz-range-thumb {
  width: 15px;
  height: 15px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

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

.tab-wrap {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--surface);
  transition: border-color 0.2s var(--ease);
}

.tab-wrap.is-active {
  border-color: var(--tone, var(--accent));
  box-shadow: 0 0 0 1px var(--tone, var(--accent));
}

.tab-wrap:nth-child(1) { --tone: #7cc4ff; }
.tab-wrap:nth-child(2) { --tone: #ffb45c; }
.tab-wrap:nth-child(3) { --tone: #7ef0cf; }
.tab-wrap:nth-child(4) { --tone: #b492ff; }
.tab-wrap:nth-child(5) { --tone: #ff7a9c; }

.tab {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.9rem;
  border: 0;
  background: transparent;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--ink-dim);
}

.tab-wrap.is-active .tab {
  color: var(--ink);
}

.tab__name::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 0.5rem;
  border-radius: 50%;
  background: var(--tone);
  vertical-align: middle;
}

.tab__count {
  padding: 0.05rem 0.4rem;
  border-radius: 20px;
  background: var(--surface-3);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-dim);
}

.tab__mute {
  display: grid;
  place-items: center;
  width: 34px;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.tab__mute span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--ink-faint);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.tab__mute[aria-pressed='true'] span {
  background: var(--danger);
  border-color: var(--danger);
}

.tab__mute:hover span {
  border-color: var(--ink);
}

.seq {
  padding: clamp(0.9rem, 2vw, 1.3rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
}

.seq__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  margin-bottom: 1rem;
}

.seq__title {
  font-size: 1.15rem;
}

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

.seq__scroll {
  overflow-x: auto;
  padding-bottom: 0.3rem;
}

.seq__grid,
.seq__ruler {
  display: grid;
  grid-template-columns: 96px repeat(16, minmax(28px, 1fr));
  gap: 5px;
  min-width: 660px;
}

.seq__row {
  display: contents;
}

.seq__label {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cell {
  aspect-ratio: 1;
  min-height: 26px;
  padding: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  cursor: pointer;
  transition: background 0.12s var(--ease), border-color 0.12s var(--ease),
    box-shadow 0.18s var(--ease), transform 0.12s var(--ease);
}

.cell--beat {
  background: var(--surface-3);
}

.cell:hover {
  border-color: var(--tone);
}

.cell.is-on {
  background: var(--tone);
  border-color: var(--tone);
  box-shadow: 0 0 14px -2px var(--tone);
}

.cell.is-now {
  border-color: rgba(231, 236, 247, 0.45);
}

.cell.is-on.is-now {
  transform: scale(1.12);
  box-shadow: 0 0 20px 0 var(--tone);
}

.seq__ruler {
  margin-top: 0.4rem;
}

.ruler__mark {
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--ink-faint);
  border-top: 1px solid transparent;
  transition: color 0.12s var(--ease), border-color 0.12s var(--ease);
}

.ruler__mark--beat {
  color: var(--ink-dim);
}

.ruler__mark.is-now {
  color: var(--tone);
  border-top-color: var(--tone);
}

.live {
  padding: clamp(0.9rem, 2vw, 1.3rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
}

.live__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.4rem;
}

.live__title {
  font-size: 1.15rem;
}

.live__hint {
  margin-bottom: 1rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
  max-width: 70ch;
}

.keys {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 0.3rem;
}

.key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  min-width: 56px;
  padding: 0.7rem 0.4rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: linear-gradient(180deg, var(--surface-3), var(--surface-2));
  cursor: pointer;
  transition: transform 0.08s var(--ease), border-color 0.15s var(--ease),
    box-shadow 0.15s var(--ease);
  touch-action: manipulation;
  user-select: none;
}

.key:hover {
  border-color: var(--tone);
}

.key.is-hit {
  animation: key-hit 0.22s var(--ease);
}

@keyframes key-hit {
  0% {
    transform: translateY(3px) scale(0.97);
    box-shadow: 0 0 22px -2px var(--tone);
    border-color: var(--tone);
  }
  100% {
    transform: none;
  }
}

.key__note {
  font-size: 0.9rem;
  font-weight: 600;
}

.key__hint {
  margin-top: 0.6rem;
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--ink-faint);
}

.export {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(1rem, 3vw, 2.4rem);
  padding: clamp(1rem, 2.4vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
}

.export__title {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.export__lead {
  font-size: 0.88rem;
  color: var(--ink-dim);
  max-width: 52ch;
}

.export__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.6rem;
}

.export__row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1 1 190px;
}

.export__status {
  flex-basis: 100%;
  margin-top: 0.4rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid rgba(124, 196, 255, 0.35);
  border-radius: var(--r-sm);
  background: rgba(124, 196, 255, 0.1);
  font-size: 0.84rem;
}

.sheet[hidden] {
  display: none;
}

.sheet {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: rgba(6, 8, 14, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.sheet__panel {
  position: relative;
  width: min(100%, 560px);
  max-height: 85svh;
  overflow-y: auto;
  padding: clamp(1.3rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
}

.sheet__panel h2 {
  font-size: 1.35rem;
  margin-bottom: 1rem;
  padding-right: 2rem;
}

.sheet__close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: transparent;
  cursor: pointer;
}

.sheet__list {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding-left: 1.3rem;
  font-size: 0.92rem;
  color: var(--ink-dim);
}

.sheet__list li::marker {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 600;
}

.footer {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  padding-block: 1.6rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
}

.footer p {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.8rem;
}

@media (max-width: 860px) {
  .export {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .topbar {
    flex-wrap: wrap;
  }

  .transport {
    gap: 0.7rem 1rem;
  }

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

  .play {
    flex: 1 1 100%;
    justify-content: center;
  }

  .live__head {
    flex-wrap: wrap;
  }

  .key {
    min-width: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .brand__mark span,
  .btn--rec.is-on {
    animation: none;
  }

  .key.is-hit {
    animation: none;
    border-color: var(--tone);
  }

  .cell,
  .key,
  .btn {
    transition: none;
  }
}