/* style.css — Piano keyboard and UI styling */

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 2rem 1rem;
}

h1 {
  font-size: 1.4rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  color: #a0a0c0;
}

/* --- Controls --- */

#controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2rem;
  max-width: 1200px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.control-group label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #888;
}

select, button {
  background: #2a2a4a;
  color: #e0e0e0;
  border: 1px solid #444;
  border-radius: 4px;
  padding: 0.5rem 0.8rem;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
}

select:focus, button:focus {
  border-color: #6c8cbf;
}

button {
  background: #3a3a6a;
  font-weight: 500;
  padding: 0.5rem 1.5rem;
  transition: background 0.15s;
}

button:hover {
  background: #4a4a8a;
}

button:active {
  background: #5a5aaa;
}

/* --- Distortion toggles --- */

#distortion-controls {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: #aaa;
  cursor: pointer;
}

.toggle input[type="checkbox"] {
  accent-color: #6c8cbf;
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

.toggle input[type="range"] {
  accent-color: #6c8cbf;
  width: 5rem;
  cursor: pointer;
}

#distortion-volume-label {
  min-width: 2.5em;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

#chord-display {
  font-size: 1.3rem;
  font-weight: 500;
  color: #c0c0e0;
  min-height: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}

#notes-display {
  font-size: 0.8rem;
  color: #888;
  min-height: 1.2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  letter-spacing: 0.05em;
}

/* --- Piano --- */

#keyboard {
  position: relative;
  width: 100%;
  max-width: 1200px;
  height: 180px;
  user-select: none;
  -webkit-user-select: none;
}

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

.piano-key {
  position: absolute;
  top: 0;
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  transition: background 0.08s;
}

.white-key {
  height: 100%;
  background: linear-gradient(to bottom, #f8f8f8, #e8e8e8);
  border: 1px solid #bbb;
  z-index: 1;
}

.white-key:hover {
  background: linear-gradient(to bottom, #fff, #f0f0f0);
}

.white-key.highlighted {
  background: linear-gradient(to bottom, #6ca0dc, #4a80bc);
  border-color: #4a80bc;
}

.white-key.highlighted.root {
  background: linear-gradient(to bottom, #e08050, #c06030);
  border-color: #c06030;
}

.black-key {
  height: 62%;
  background: linear-gradient(to bottom, #333, #111);
  border: 1px solid #000;
  z-index: 2;
}

.black-key:hover {
  background: linear-gradient(to bottom, #444, #222);
}

.black-key.highlighted {
  background: linear-gradient(to bottom, #5080b0, #305890);
  border-color: #305890;
}

.black-key.highlighted.root {
  background: linear-gradient(to bottom, #c06030, #a04020);
  border-color: #a04020;
}

.key-label {
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  color: #999;
  pointer-events: none;
}

/* --- Products keyboard --- */

#products-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #666;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
  text-align: center;
}

#keyboard-products {
  position: relative;
  width: 100%;
  max-width: 1200px;
  height: 130px;
  user-select: none;
  -webkit-user-select: none;
}

/* Harmonic products — purple */
#keyboard-products .white-key.kind-harmonic {
  background: linear-gradient(to bottom, #9060c0, #7040a0);
  border-color: #7040a0;
}
#keyboard-products .black-key.kind-harmonic {
  background: linear-gradient(to bottom, #7a4eaa, #5a2e8a);
  border-color: #5a2e8a;
}

/* Sum (IMD) products — teal */
#keyboard-products .white-key.kind-sum {
  background: linear-gradient(to bottom, #40a0a0, #208080);
  border-color: #208080;
}
#keyboard-products .black-key.kind-sum {
  background: linear-gradient(to bottom, #308a8a, #106a6a);
  border-color: #106a6a;
}

/* Difference (IMD) products — amber */
#keyboard-products .white-key.kind-difference {
  background: linear-gradient(to bottom, #c0a040, #a08020);
  border-color: #a08020;
}
#keyboard-products .black-key.kind-difference {
  background: linear-gradient(to bottom, #aa8a30, #8a6a10);
  border-color: #8a6a10;
}

/* Harmonic + Sum — purple/teal stripes */
#keyboard-products .white-key.kind-harmonic.kind-sum {
  background: repeating-linear-gradient(
    -45deg,
    #9060c0, #9060c0 4px, #40a0a0 4px, #40a0a0 8px
  );
  border-color: #508090;
}
#keyboard-products .black-key.kind-harmonic.kind-sum {
  background: repeating-linear-gradient(
    -45deg,
    #7a4eaa, #7a4eaa 4px, #308a8a 4px, #308a8a 8px
  );
  border-color: #506070;
}

/* Harmonic + Difference — purple/amber stripes */
#keyboard-products .white-key.kind-harmonic.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #9060c0, #9060c0 4px, #c0a040 4px, #c0a040 8px
  );
  border-color: #a08060;
}
#keyboard-products .black-key.kind-harmonic.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #7a4eaa, #7a4eaa 4px, #aa8a30 4px, #aa8a30 8px
  );
  border-color: #906050;
}

/* Sum + Difference — teal/amber stripes */
#keyboard-products .white-key.kind-sum.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #40a0a0, #40a0a0 4px, #c0a040 4px, #c0a040 8px
  );
  border-color: #809060;
}
#keyboard-products .black-key.kind-sum.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #308a8a, #308a8a 4px, #aa8a30 4px, #aa8a30 8px
  );
  border-color: #6a7a40;
}

/* All three — purple/teal/amber tri-stripe */
#keyboard-products .white-key.kind-harmonic.kind-sum.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #9060c0, #9060c0 3px, #40a0a0 3px, #40a0a0 6px, #c0a040 6px, #c0a040 9px
  );
  border-color: #807060;
}
#keyboard-products .black-key.kind-harmonic.kind-sum.kind-difference {
  background: repeating-linear-gradient(
    -45deg,
    #7a4eaa, #7a4eaa 3px, #308a8a 3px, #308a8a 6px, #aa8a30 6px, #aa8a30 9px
  );
  border-color: #6a6050;
}

/* Octave-shifted keys get a dashed border */
#keyboard-products .piano-key.octave-shifted {
  border-style: dashed;
  border-width: 2px;
}

.white-key .cent-badge {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.55rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
  padding: 1px 3px;
  border-radius: 2px;
  pointer-events: none;
  white-space: nowrap;
}

.black-key .cent-badge {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.55rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.5);
  padding: 1px 3px;
  border-radius: 2px;
  pointer-events: none;
  white-space: nowrap;
  z-index: 3;
}

#signature-controls {
  display: flex;
  justify-content: center;
  margin-top: 1.5rem;
  margin-bottom: 0.3rem;
}

/* --- Rational signature --- */

#rational-signature {
  font-size: 0.85rem;
  font-family: 'Menlo', 'Consolas', monospace;
  color: #b0b0d0;
  margin-top: 1.5rem;
  text-align: center;
}

.sig-row {
  display: flex;
  justify-content: center;
  align-items: baseline;
  line-height: 1.4;
}

.sig-label {
  color: #666;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  width: 6em;
  text-align: right;
  flex-shrink: 0;
}

.sig-cells {
  display: flex;
  gap: 0;
}

.sig-cells .sig-cell {
  min-width: 4em;
  text-align: center;
}

.sig-names {
  color: #888;
  font-size: 0.75rem;
  line-height: 1.2;
  margin-bottom: 0.4rem;
}

#sig-chord-name {
  font-size: 1rem;
  color: #d0c0e0;
  margin-top: 0.3rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

/* --- Tuning --- */

#tuning-info {
  font-size: 0.7rem;
  color: #666;
  margin-top: 0.5rem;
}