/* Web Piano - dark theme, mobile first. */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-raised: #26344b;
  --surface-sunken: #131c2f;
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(148, 163, 184, 0.3);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #e879f9;
  --accent-deep: #c026d3;
  --accent-soft: rgba(232, 121, 249, 0.14);
  --accent-line: rgba(232, 121, 249, 0.55);
  --accent-glow: rgba(232, 121, 249, 0.55);
  --accent-ink: #2e0a36;
  --danger: #f87171;
  --radius: 12px;
  --radius-sm: 10px;
  --shadow: 0 14px 34px -14px rgba(2, 6, 23, 0.75), 0 2px 8px rgba(2, 6, 23, 0.35);
  --fast: 150ms;
  --slow: 250ms;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'Cascadia Mono', 'SF Mono', Menlo, Consolas, monospace;
}

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1100px 520px at 50% -240px, rgba(232, 121, 249, 0.12), transparent 70%), var(--bg);
  color: var(--text);
  font: 15px/1.45 var(--font);
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

/* ---- layout ---------------------------------------------------------- */

.app {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 1080px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 12px;
}

.main {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0) 45%), var(--surface);
  box-shadow: var(--shadow);
}

.panels {
  display: grid;
  gap: 12px;
}

/* ---- header and footer ---------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: -0.015em;
}

.brand__logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 6px 16px -6px var(--accent-glow);
}

.footer {
  margin-top: auto;
  text-align: center;
  font-size: 0.8125rem;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--fast) ease;
}

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

/* ---- buttons and fields ------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 40px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.15;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background-color var(--fast) ease, border-color var(--fast) ease, color var(--fast) ease,
    box-shadow var(--fast) ease, transform var(--fast) ease, opacity var(--fast) ease;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

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

.btn--icon {
  width: 40px;
  padding: 0;
}

.btn--toggle[aria-pressed='true'],
.btn.is-active,
.btn.is-playing {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 8px 20px -10px var(--accent-glow);
}

.btn--lang {
  min-width: 44px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}

.kbd {
  display: none;
  padding: 2px 6px;
  border: 1px solid currentColor;
  border-radius: 5px;
  font: 600 0.6875rem/1.2 var(--mono);
  opacity: 0.7;
}

.select {
  width: 100%;
  min-height: 40px;
  padding: 0 34px 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-raised)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4' fill='none' stroke='%2394a3b8' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    no-repeat right 10px center / 16px 16px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--fast) ease;
}

.select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.select option {
  background: var(--surface);
  color: var(--text);
}

@media (hover: hover) {
  .select:hover {
    border-color: var(--accent-line);
  }
}

.range {
  --fill: 80%;
  width: 100%;
  height: 40px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.range::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent) var(--fill), rgba(148, 163, 184, 0.28) var(--fill));
}

.range::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border: 4px solid var(--accent);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(2, 6, 23, 0.5);
  -webkit-appearance: none;
}

.range::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.28);
}

.range::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

.range::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 4px solid var(--accent);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(2, 6, 23, 0.5);
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: end;
  gap: 10px 8px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.field__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.field__label output {
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 4px;
}

.stepper__value {
  flex: 1;
  min-width: 64px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  white-space: nowrap;
}

.toggles {
  display: flex;
  gap: 8px;
}

.toggles .btn {
  flex: 1 1 0;
  padding: 0 10px;
}

/* ---- note readout and trail ------------------------------------------ */

.display {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  margin: 10px 0 8px;
}

.readout {
  display: flex;
  flex: none;
  flex-direction: column;
  justify-content: center;
  min-width: 86px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-sunken);
}

.readout__note {
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 750;
  line-height: 1.1;
}

.readout__hz {
  color: var(--muted);
  font: 500 0.75rem/1.3 var(--mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.trail {
  display: flex;
  flex: 1;
  justify-content: flex-end;
  gap: 6px;
  min-width: 0;
  margin: 0;
  padding: 2px 0;
  overflow: hidden;
  list-style: none;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 56px);
  mask-image: linear-gradient(90deg, transparent, #000 56px);
}

.pill {
  --age: 0;
  flex: none;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-raised);
  font-size: 0.8125rem;
  font-weight: 650;
  line-height: 1.2;
  opacity: max(0.3, calc(1 - var(--age) * 0.07));
  animation: pill-in var(--slow) ease-out;
}

.pill:last-child {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: #f5d0fe;
}

.trail-empty {
  flex: 1;
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

@keyframes pill-in {
  from {
    opacity: 0;
    transform: translateX(14px) scale(0.92);
  }
}

/* ---- keys -------------------------------------------------------------- */

/* On a phone the keybed spans the whole card, so each key gets every pixel. */
.keybed {
  margin: 0 -12px;
  padding: 8px 4px 6px;
  background: linear-gradient(180deg, #0a1020, #0e1628);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), inset 0 -1px 0 rgba(0, 0, 0, 0.5);
}

.keybed::before {
  content: '';
  display: block;
  height: 4px;
  margin: 0 1px;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(90deg, #5b1650, #9d2a8a 50%, #5b1650);
}

.keys {
  position: relative;
  display: flex;
  height: clamp(180px, 32vh, 240px);
  cursor: pointer;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  transition: box-shadow var(--slow) ease-out, color var(--slow) ease-out;
}

.key--white {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  padding-bottom: 10px;
  border-radius: 0 0 7px 7px;
  background: linear-gradient(180deg, #cbd5e1 0, #f1f5f9 14px, #ffffff 72%, #eef2f7 100%);
  box-shadow: inset -1px 0 0 rgba(15, 23, 42, 0.3), inset 0 -5px 0 #d5dde8;
  color: #64748b;
}

.key--black {
  /* 0.62 of a white key on a wide keyboard; up to 0.7 on a narrow one, so it stays easy to hit. */
  --white: calc(100% / var(--whites));
  --bw: clamp(var(--white) * 0.62, 40px, var(--white) * 0.7);
  position: absolute;
  top: 0;
  left: calc((var(--pos) + var(--shift)) * 100% / var(--whites) - var(--bw) / 2);
  z-index: 2;
  width: var(--bw);
  height: 62%;
  padding-bottom: 8px;
  border-radius: 0 0 5px 5px;
  background: linear-gradient(180deg, #0b1120 0%, #1e293b 80%, #334155 100%);
  box-shadow: inset 0 -6px 0 #0b1120, inset 1px 0 0 rgba(255, 255, 255, 0.08), 0 4px 6px rgba(2, 6, 23, 0.55);
  color: #cbd5e1;
}

.key--white.is-ringing {
  background: linear-gradient(180deg, #e9d5ff 0, #fae8ff 30%, #fdf4ff 100%);
  box-shadow: inset -1px 0 0 rgba(15, 23, 42, 0.3), inset 0 -5px 0 #f0abfc;
}

.key--black.is-ringing {
  background: linear-gradient(180deg, #3b0764, #6b21a8 80%, #86198f);
}

.key--white.is-next {
  box-shadow: inset 0 0 0 2px var(--accent), inset 0 -5px 0 #d5dde8;
}

.key--white.is-down {
  z-index: 1;
  background: linear-gradient(180deg, #f5d0fe 0%, #f0abfc 45%, var(--accent) 100%);
  box-shadow: inset -1px 0 0 rgba(46, 10, 54, 0.25), inset 0 4px 10px rgba(46, 10, 54, 0.25), 0 0 24px 2px var(--accent-glow);
  color: var(--accent-ink);
}

.key--black.is-down {
  background: linear-gradient(180deg, #86198f 0%, var(--accent-deep) 60%, var(--accent) 100%);
  box-shadow: inset 0 -3px 0 #701a75, 0 0 18px 2px var(--accent-glow);
  color: #fdf4ff;
}

.key.is-down {
  transition-duration: 40ms;
}

.key.is-next::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 12px;
  height: 12px;
  margin-left: -6px;
  border-radius: 50%;
  background: var(--accent);
  animation: next-pulse 1.1s ease-out infinite;
}

.key--white.is-next::after {
  bottom: 56px;
}

.key--black.is-next::after {
  bottom: 30px;
  width: 10px;
  height: 10px;
  margin-left: -5px;
}

@keyframes next-pulse {
  from {
    box-shadow: 0 0 0 0 var(--accent-glow);
  }
  to {
    box-shadow: 0 0 0 12px rgba(232, 121, 249, 0);
  }
}

.key__name,
.key__hint {
  line-height: 1;
  visibility: hidden;
  pointer-events: none;
}

.key__name {
  font-size: 0.8125rem;
  font-weight: 700;
  white-space: nowrap;
}

.key__hint {
  padding: 3px 5px;
  border-radius: 4px;
  background: rgba(15, 23, 42, 0.07);
  font: 600 0.75rem/1 var(--mono);
}

.key--black .key__hint {
  background: rgba(255, 255, 255, 0.1);
}

.key.is-down .key__hint {
  background: rgba(46, 10, 54, 0.12);
}

.key__name--c,
.show-labels .key__name,
.show-labels .key__hint {
  visibility: visible;
}

@media (hover: none) and (pointer: coarse) {
  .key__hint {
    display: none;
  }
}

.help {
  display: none;
  margin: 10px 2px 0;
  color: var(--muted);
  font-size: 0.8125rem;
}

/* ---- recorder and melodies ------------------------------------------- */

.panel__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.panel__title .icon {
  color: var(--accent);
}

.transport {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.transport .btn {
  flex-direction: column;
  gap: 3px;
  min-height: 52px;
  padding: 6px 4px;
  font-size: 0.8125rem;
}

.snap-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.icon--record {
  color: var(--danger);
}

.btn--record[aria-pressed='true'] {
  border-color: var(--danger);
  background: rgba(248, 113, 113, 0.14);
  color: #fecaca;
}

.btn--record[aria-pressed='true'] .icon--record {
  animation: rec-blink 1s ease-in-out infinite;
}

@keyframes rec-blink {
  50% {
    opacity: 0.35;
  }
}

.btn--clear.is-armed {
  border-color: var(--danger);
  color: #fecaca;
}

.status {
  min-height: 1.45em;
  margin: 10px 0 0;
}

.status.is-miss {
  color: var(--danger);
}

.status.is-done {
  color: var(--accent);
  font-weight: 700;
}

.detail {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

.subhead {
  margin: 12px 0 6px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.takes {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.take {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) minmax(72px, 1.3fr);
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-sunken);
  transition: border-color var(--fast) ease;
}

.take.is-playing {
  border-color: var(--accent-line);
}

.take.is-playing .take__play {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.take__info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.take__name {
  font-weight: 700;
}

.take__meta {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.take__roll {
  position: relative;
  height: 34px;
  overflow: hidden;
  border-radius: 6px;
  background: repeating-linear-gradient(180deg, rgba(148, 163, 184, 0.07) 0 1px, transparent 1px 6px), rgba(15, 23, 42, 0.6);
}

.take__roll i {
  position: absolute;
  top: calc(var(--y) * 1%);
  left: calc(var(--x) * 1%);
  width: max(2px, calc(var(--w) * 1%));
  height: 3px;
  margin-top: -1.5px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.9;
}

.melody-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.melody-row .select {
  grid-column: 1 / -1;
}

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

.btn.is-playing .icon--stop {
  display: block;
}

.progress {
  height: 6px;
  margin-top: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.2);
}

.progress__bar {
  display: block;
  width: calc(var(--progress, 0) * 100%);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  transition: width var(--slow) ease;
}

/* ---- wider screens ----------------------------------------------------- */

@media (min-width: 480px) {
  .transport .btn {
    flex-direction: row;
    gap: 8px;
    min-height: 40px;
    padding: 0 12px;
    font-size: 0.875rem;
  }

  .melody-row {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .melody-row .select {
    grid-column: auto;
  }
}

@media (min-width: 680px) {
  .app {
    gap: 16px;
    padding: 24px;
  }

  .main {
    gap: 16px;
  }

  .card {
    padding: 16px;
  }

  .keybed {
    margin: 0 -8px;
    border-radius: var(--radius-sm);
  }

  .brand {
    font-size: 1.375rem;
  }

  .controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 16px;
  }

  .field--instrument,
  .field--volume {
    flex: 0 1 200px;
  }

  .toggles {
    margin-left: auto;
  }

  .toggles .btn {
    flex: none;
    padding: 0 14px;
  }

  .kbd {
    display: inline-block;
  }

  .help {
    display: block;
  }
}

@media (min-width: 860px) {
  .panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
  }
}

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