music/styles.css

:root {
  --bg: #08111f;
  --panel: rgba(7, 20, 36, 0.72);
  --panel-strong: rgba(12, 29, 50, 0.92);
  --panel-border: rgba(152, 214, 255, 0.16);
  --text: #eef7ff;
  --muted: #9cb2c5;
  --accent: #65f2d1;
  --accent-2: #ffb36a;
  --accent-3: #87a7ff;
  --danger: #ff7c74;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  position: relative;
  overflow-x: hidden;
  background:
    radial-gradient(circle at top, rgba(95, 151, 255, 0.18), transparent 30%),
    linear-gradient(180deg, #091320 0%, #050a12 100%);
  color: var(--text);
  font-family: "Space Grotesk", sans-serif;
}

button,
select {
  font: inherit;
}

code {
  padding: 0.14rem 0.35rem;
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.08);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.92em;
}

.backdrop {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.backdrop__orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(36px);
  opacity: 0.55;
}

.backdrop__orb--left {
  top: 10%;
  left: -8%;
  width: 22rem;
  height: 22rem;
  background: rgba(101, 242, 209, 0.2);
  animation: drift 16s ease-in-out infinite;
}

.backdrop__orb--right {
  right: -5%;
  bottom: 8%;
  width: 26rem;
  height: 26rem;
  background: rgba(255, 179, 106, 0.16);
  animation: drift 20s ease-in-out infinite reverse;
}

.backdrop__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(135, 167, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(135, 167, 255, 0.06) 1px, transparent 1px);
  background-size: 3rem 3rem;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 85%);
}

.app {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.hero {
  padding: 1rem 0 2rem;
  animation: rise 700ms ease-out both;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(2.7rem, 7vw, 5.8rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
}

.hero__copy {
  max-width: 42rem;
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  line-height: 1.6;
}

.controls,
.legend {
  display: grid;
  gap: 1rem;
}

.controls {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  align-items: stretch;
  margin-bottom: 1.4rem;
  animation: rise 850ms ease-out both;
}

.power,
.control-card,
.key {
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.power,
.control-card {
  min-height: 5.4rem;
  border-radius: 1.25rem;
  background: var(--panel);
}

.power {
  padding: 1rem 1.25rem;
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.power:hover,
.power:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(101, 242, 209, 0.5);
  background: rgba(11, 35, 58, 0.96);
}

.power--armed {
  border-color: rgba(101, 242, 209, 0.7);
  color: #021117;
  background: linear-gradient(135deg, var(--accent), #c2fff0);
}

.control-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.95rem 1.15rem;
}

.control-card__label {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(152, 214, 255, 0.18);
  border-radius: 0.85rem;
  background: rgba(5, 12, 22, 0.55);
  color: var(--text);
}

.mapping-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.mini-field {
  display: grid;
  gap: 0.35rem;
}

.mini-field span {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.octave-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.octave-controls button,
.octave-controls output {
  display: grid;
  place-items: center;
  height: 2.5rem;
  min-width: 2.5rem;
  border-radius: 999px;
}

.octave-controls button {
  border: 1px solid rgba(152, 214, 255, 0.18);
  background: rgba(5, 12, 22, 0.55);
  color: var(--text);
  cursor: pointer;
}

.octave-controls output {
  padding: 0 0.8rem;
  background: rgba(255, 255, 255, 0.06);
  font-weight: 700;
}

.note-display {
  margin: 0;
  font-size: 1.05rem;
}

.metronome-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.metronome-toggle {
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(152, 214, 255, 0.18);
  border-radius: 999px;
  background: rgba(5, 12, 22, 0.55);
  color: var(--text);
  cursor: pointer;
}

.metronome-toggle.is-running {
  border-color: rgba(255, 179, 106, 0.7);
  background: rgba(77, 44, 15, 0.8);
}

.metronome-status {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
}

.metronome-light {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 0 0 1px rgba(152, 214, 255, 0.14);
  transition: background 100ms ease, box-shadow 100ms ease, transform 100ms ease;
}

.metronome-light.is-pulsing {
  background: var(--accent-2);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.1),
    0 0 18px rgba(255, 179, 106, 0.5);
  transform: scale(1.15);
}

.metronome-light.is-accent {
  background: var(--accent);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.1),
    0 0 20px rgba(101, 242, 209, 0.55);
}

.tempo-control {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.35rem;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
}

.tempo-control input {
  width: 100%;
  accent-color: var(--accent-2);
}

.board {
  display: grid;
  gap: 0.9rem;
  padding: 1.3rem;
  border: 1px solid rgba(152, 214, 255, 0.14);
  border-radius: 1.8rem;
  background: linear-gradient(180deg, rgba(9, 22, 38, 0.78), rgba(7, 15, 28, 0.92));
  box-shadow: var(--shadow);
  animation: rise 1s ease-out both;
}

.sequencer {
  margin-top: 1.1rem;
  padding: 1.35rem;
  border: 1px solid rgba(152, 214, 255, 0.14);
  border-radius: 1.8rem;
  background: linear-gradient(180deg, rgba(10, 22, 38, 0.84), rgba(8, 16, 28, 0.94));
  box-shadow: var(--shadow);
  animation: rise 1.08s ease-out both;
}

.sequencer__header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.sequencer__header h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.sequencer__copy {
  max-width: 36rem;
  margin: 0.5rem 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.sequencer__transport {
  display: flex;
  flex-wrap: wrap;
  justify-content: end;
  gap: 0.65rem;
}

.sequencer-button {
  padding: 0.72rem 1rem;
  border: 1px solid rgba(101, 242, 209, 0.28);
  border-radius: 999px;
  background: rgba(14, 42, 56, 0.9);
  color: var(--text);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.sequencer-button:hover,
.sequencer-button:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(101, 242, 209, 0.55);
}

.sequencer-button.is-running {
  border-color: rgba(255, 179, 106, 0.78);
  background: rgba(78, 46, 17, 0.88);
}

.sequencer-button--ghost {
  border-color: rgba(152, 214, 255, 0.18);
  background: rgba(5, 12, 22, 0.55);
}

.sequencer-grid {
  overflow-x: auto;
}

.sequencer-grid__inner {
  display: grid;
  grid-template-columns: 8rem repeat(16, minmax(2.4rem, 1fr));
  gap: 0.5rem;
  min-width: 54rem;
}

.sequencer-grid__step-label,
.sequencer-lane__name,
.sequencer-step {
  min-height: 3rem;
}

.sequencer-grid__step-label {
  display: grid;
  place-items: center;
  border-radius: 0.8rem;
  color: rgba(238, 247, 255, 0.6);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.04);
}

.sequencer-grid__step-label.is-accent {
  color: var(--accent-2);
}

.sequencer-grid__corner {
  background: transparent;
}

.sequencer-lane__name {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0 0.9rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.04);
}

.sequencer-lane__dot {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 999px;
}

.sequencer-lane__dot--kick {
  background: #65f2d1;
}

.sequencer-lane__dot--snare {
  background: #ffb36a;
}

.sequencer-lane__dot--hat {
  background: #87a7ff;
}

.sequencer-lane__dot--clap {
  background: #ff7c74;
}

.sequencer-lane__label {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.sequencer-lane__label strong {
  font-size: 0.96rem;
}

.sequencer-lane__label span {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sequencer-step {
  border: 1px solid rgba(152, 214, 255, 0.14);
  border-radius: 0.95rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    rgba(9, 23, 37, 0.92);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.sequencer-step:hover,
.sequencer-step:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(152, 214, 255, 0.32);
}

.sequencer-step.is-active {
  border-color: rgba(101, 242, 209, 0.6);
  background:
    linear-gradient(180deg, rgba(101, 242, 209, 0.24), rgba(255, 179, 106, 0.08)),
    rgba(14, 41, 57, 0.95);
  box-shadow: inset 0 0 0 1px rgba(101, 242, 209, 0.14);
}

.sequencer-step.is-current {
  box-shadow:
    0 0 0 1px rgba(255, 179, 106, 0.4),
    0 0 20px rgba(255, 179, 106, 0.18);
}

.sequencer-step.is-accent {
  border-color: rgba(255, 179, 106, 0.16);
}

.board-row {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 0.8rem;
}

.board-row--offset {
  grid-template-columns: repeat(9, minmax(0, 1fr));
  padding-left: 2.5rem;
}

.board-row--wide {
  grid-template-columns: repeat(7, minmax(0, 1fr));
  padding-right: 12rem;
}

.key {
  position: relative;
  min-height: 7.2rem;
  padding: 0.9rem;
  border-radius: 1.2rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.02)),
    var(--panel-strong);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  touch-action: none;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.key:hover,
.key:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(135, 167, 255, 0.45);
}

.key__letter,
.key__note {
  display: block;
}

.key__shape-role,
.key__shape-name {
  position: absolute;
  border-radius: 999px;
  font-family: "IBM Plex Mono", monospace;
  line-height: 1;
  pointer-events: none;
}

.key__letter {
  font-size: 1.45rem;
  font-weight: 700;
}

.key__note {
  margin-top: 0.35rem;
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
}

.key__shape-role {
  top: 0.75rem;
  right: 0.75rem;
  min-width: 1.7rem;
  padding: 0.25rem 0.35rem;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(238, 247, 255, 0.76);
  font-size: 0.74rem;
  text-align: center;
}

.key__shape-name {
  left: 0.75rem;
  bottom: 0.72rem;
  padding: 0.22rem 0.42rem;
  background: rgba(101, 242, 209, 0.12);
  color: rgba(101, 242, 209, 0.9);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.key__index {
  position: absolute;
  right: 0.9rem;
  bottom: 0.9rem;
  color: rgba(238, 247, 255, 0.28);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
}

.key.is-chord-tone {
  border-color: rgba(135, 167, 255, 0.34);
  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.26),
    inset 0 0 0 1px rgba(135, 167, 255, 0.08);
}

.key.is-chord-root {
  border-color: rgba(255, 179, 106, 0.56);
  box-shadow:
    0 14px 30px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(255, 179, 106, 0.12),
    0 0 30px rgba(255, 179, 106, 0.12);
}

.key.is-chord-root .key__shape-role {
  background: rgba(255, 179, 106, 0.18);
  color: #ffd7b2;
}

.key.is-chord-tone .key__shape-role {
  background: rgba(135, 167, 255, 0.14);
  color: #ccdaff;
}

.key.is-active {
  transform: translateY(-4px) scale(1.01);
  border-color: rgba(101, 242, 209, 0.8);
  background:
    linear-gradient(180deg, rgba(101, 242, 209, 0.18), rgba(255, 179, 106, 0.08)),
    rgba(14, 38, 56, 0.96);
  box-shadow:
    0 18px 38px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(101, 242, 209, 0.15),
    0 0 38px rgba(101, 242, 209, 0.24);
}

.legend {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
  animation: rise 1.1s ease-out both;
}

.legend__item {
  padding: 1rem 1.1rem;
  border: 1px solid rgba(152, 214, 255, 0.12);
  border-radius: 1.1rem;
  background: rgba(7, 20, 36, 0.56);
}

.legend__title {
  display: block;
  margin-bottom: 0.45rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.legend p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(1.2rem, -1rem, 0) scale(1.08);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .controls,
  .legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .sequencer__header {
    align-items: start;
    flex-direction: column;
  }

  .sequencer__transport {
    justify-content: start;
  }

  .board-row--offset,
  .board-row--wide {
    padding: 0;
  }
}

@media (max-width: 700px) {
  .app {
    width: min(100% - 1rem, 48rem);
    padding-top: 1.2rem;
  }

  .controls,
  .legend {
    grid-template-columns: 1fr;
  }

  .board {
    padding: 0.9rem;
    gap: 0.7rem;
  }

  .board-row {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .board-row--offset {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .board-row--wide {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .key {
    min-height: 5.6rem;
  }
}