:root {
  --bg: #05070b;
  --fg: rgba(235, 245, 255, 0.92);
  --muted: rgba(235, 245, 255, 0.62);
  --cyan: rgba(80, 190, 255, 1);
  --cyan-dim: rgba(80, 190, 255, 0.35);
  --shadow: rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--fg);
  background: radial-gradient(1200px 700px at 50% 10%, rgba(35, 60, 95, 0.22), transparent 65%),
    radial-gradient(900px 700px at 20% 30%, rgba(80, 190, 255, 0.08), transparent 70%),
    var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  overflow: hidden;
}

.app {
  position: relative;
  height: 100%;
  width: 100%;
}

.app[data-tools="0"] .midi,
.app[data-tools="0"] .recording {
  display: none;
}

.stage {
  position: absolute;
  inset: 0;
  pointer-events: none;
  filter: blur(0.2px);
}

.stage__glow {
  position: absolute;
  left: 50%;
  bottom: 110px;
  width: min(900px, 90vw);
  height: 420px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(80, 190, 255, 0.12), transparent 70%),
    radial-gradient(closest-side, rgba(20, 30, 55, 0.8), transparent 75%);
  filter: blur(16px);
  opacity: 0.85;
}

.hud {
  position: absolute;
  top: 18px;
  left: 18px;
  right: 18px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  pointer-events: none;
}

.hud__left {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hud__actions {
  pointer-events: auto;
  display: flex;
  gap: 10px;
  align-items: center;
}

.hud__btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 16, 26, 0.55);
  color: rgba(235, 245, 255, 0.86);
  border-radius: 12px;
  padding: 8px 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, transform 80ms ease;
}

.hud__btn:hover {
  border-color: rgba(80, 190, 255, 0.35);
  background: rgba(10, 16, 26, 0.72);
}

.hud__btn:active {
  transform: translateY(1px);
}

.loading {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: min(460px, calc(100vw - 32px));
  background: rgba(10, 16, 26, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 10px 12px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  pointer-events: none;
}

.loading__text {
  font-size: 12px;
  color: rgba(235, 245, 255, 0.78);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.loading__bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.loading__barFill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, rgba(80, 190, 255, 0.9), rgba(80, 190, 255, 0.3));
  transition: width 120ms ease;
}

.midi {
  position: absolute;
  top: 112px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
}

.midi__name {
  color: rgba(235, 245, 255, 0.7);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.midi__controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.midi__btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 16, 26, 0.55);
  color: rgba(235, 245, 255, 0.86);
  border-radius: 12px;
  padding: 8px 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, transform 80ms ease;
}

.midi__btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.midi__btn:not(:disabled):hover {
  border-color: rgba(80, 190, 255, 0.35);
  background: rgba(10, 16, 26, 0.72);
}

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

.recording {
  position: absolute;
  top: 156px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
}

.rec__select {
  flex: 1;
  min-width: 120px;
  background: rgba(10, 16, 26, 0.4);
  color: rgba(235, 245, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 8px 10px;
  font-size: 12px;
}

.rec__controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.rec__btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 16, 26, 0.55);
  color: rgba(235, 245, 255, 0.86);
  border-radius: 12px;
  padding: 8px 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, transform 80ms ease;
}

.rec__btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.rec__btn:not(:disabled):hover {
  border-color: rgba(80, 190, 255, 0.35);
  background: rgba(10, 16, 26, 0.72);
}

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

.hud__title {
  font-weight: 650;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(235, 245, 255, 0.82);
}

.hud__hint {
  font-size: 13px;
  color: var(--muted);
}

.fx {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.piano-wrap {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  width: calc(100vw - 24px);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: rgba(235, 245, 255, 0.18) transparent;
}

.piano {
  position: relative;
  height: 220px;
  width: 1680px;
  max-width: none;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(20, 30, 45, 0.72), rgba(5, 7, 11, 0.75));
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
  touch-action: none;
}

.keys {
  position: absolute;
  inset: 0;
}

.keys--white {
  display: flex;
  gap: 2px;
  padding: 10px;
}

.keys--black {
  position: absolute;
  left: 10px;
  right: 10px;
  top: 10px;
  bottom: 10px;
  pointer-events: none;
}

.key {
  appearance: none;
  border: 0;
  padding: 0;
  margin: 0;
  border-radius: 10px;
  user-select: none;
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  padding-bottom: 10px;
  transition: transform 90ms ease, filter 120ms ease, box-shadow 120ms ease;
  will-change: transform;
}

.key:focus-visible {
  outline: 2px solid rgba(80, 190, 255, 0.45);
  outline-offset: 2px;
}

.key--white {
  flex: 1;
  background: linear-gradient(180deg, rgba(245, 250, 255, 0.95), rgba(200, 215, 235, 0.92));
  box-shadow: inset 0 -10px 18px rgba(0, 0, 0, 0.18), 0 14px 26px rgba(0, 0, 0, 0.28);
  pointer-events: auto;
}

.key--black {
  position: absolute;
  top: 0;
  height: 62%;
  width: calc(100% / var(--white-count, 52) * 0.72);
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(25, 30, 40, 0.98), rgba(5, 7, 11, 0.96));
  box-shadow: inset 0 -14px 20px rgba(0, 0, 0, 0.55), 0 18px 30px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.06);
  pointer-events: auto;
}

.key__note {
  font-size: 12px;
  letter-spacing: 0.08em;
  opacity: 0.6;
}

.key__center {
  font-size: 10px;
  letter-spacing: 0.08em;
  opacity: 0.78;
  margin-top: 2px;
  display: none;
}

.key[data-center-c="1"] .key__center {
  display: block;
}

.key__kbd {
  font-size: 11px;
  letter-spacing: 0.12em;
  opacity: 0.55;
  margin-top: 2px;
}

.key--black .key__note,
.key--black .key__kbd {
  color: rgba(235, 245, 255, 0.82);
  opacity: 0.65;
}

.key--black .key__center {
  color: rgba(235, 245, 255, 0.82);
}

.piano[data-show-pitch="0"] .key__note {
  display: none;
}

.piano[data-show-kbd="0"] .key__kbd {
  display: none;
}

.piano[data-show-center-c="0"] .key__center {
  display: none;
}

.settings-panel {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr min(360px, 86vw);
  pointer-events: none;
  z-index: 40;
}

.settings-panel__backdrop {
  grid-column: 1 / -1;
  grid-row: 1;
  background: rgba(0, 0, 0, 0.42);
  opacity: 0;
  transition: opacity 160ms ease;
}

.settings-panel__body {
  grid-column: 2;
  grid-row: 1;
  position: relative;
  background: linear-gradient(180deg, rgba(15, 22, 34, 0.95), rgba(6, 8, 12, 0.92));
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: -18px 0 60px rgba(0, 0, 0, 0.55);
  transform: translateX(16px);
  opacity: 0;
  transition: transform 160ms ease, opacity 160ms ease;
  padding: 18px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.settings-panel__title {
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(235, 245, 255, 0.88);
}

.settings-panel__close {
  position: absolute;
  top: 14px;
  right: 14px;
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 16, 26, 0.4);
  color: rgba(235, 245, 255, 0.82);
  border-radius: 10px;
  padding: 7px 10px;
  font-size: 12px;
  cursor: pointer;
}

.settings-panel__group {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.settings-panel__group-title {
  font-size: 12px;
  color: rgba(235, 245, 255, 0.74);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.settings-panel__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: rgba(235, 245, 255, 0.82);
}

.settings-panel__row input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

.settings-panel__row select {
  background: rgba(10, 16, 26, 0.4);
  color: rgba(235, 245, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 6px 8px;
}

.settings-panel__row--range {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.settings-panel__row--range input[type="range"] {
  width: 100%;
}

.settings-panel__value {
  color: rgba(235, 245, 255, 0.7);
  font-size: 12px;
}

.settings-panel.is-open {
  pointer-events: auto;
}

.settings-panel.is-open .settings-panel__backdrop {
  opacity: 1;
}

.settings-panel.is-open .settings-panel__body {
  transform: translateX(0);
  opacity: 1;
}

.key.is-active {
  transform: translateY(2px);
  filter: brightness(1.04);
}

.key--white.is-active {
  box-shadow: inset 0 -10px 18px rgba(0, 0, 0, 0.12), 0 18px 34px rgba(80, 190, 255, 0.15),
    0 18px 26px rgba(0, 0, 0, 0.22);
}

.key--black.is-active {
  box-shadow: inset 0 -16px 22px rgba(0, 0, 0, 0.6), 0 18px 34px rgba(80, 190, 255, 0.18);
}

@media (max-width: 560px) {
  .hud__hint {
    display: none;
  }
  .midi {
    top: 96px;
    left: 12px;
    right: 12px;
    flex-wrap: wrap;
  }
  .recording {
    top: 144px;
    left: 12px;
    right: 12px;
    flex-wrap: wrap;
  }
  .piano {
    height: 190px;
    width: 1580px;
  }
  .keys--white {
    padding: 8px;
  }
  .keys--black {
    left: 8px;
    right: 8px;
    top: 8px;
    bottom: 8px;
  }
}