:root {
  --bg0: #0b0e14;
  --bg1: #121826;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-edge: rgba(255, 255, 255, 0.08);
  --text: #d7dce6;
  --dim: #7a8499;
  --amber: #ffb84d;
  --teal: #4dd6c1;
  --violet: #b18cff;
  --rose: #ff6f61;
  --track: rgba(255, 255, 255, 0.10);
}

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

html, body { height: 100%; }

body {
  background: radial-gradient(1200px 700px at 70% -10%, #1a2238 0%, var(--bg0) 55%) fixed;
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- header ---------- */
header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--panel-edge);
  flex-wrap: wrap;
}

.brand h1 {
  font-size: 22px;
  letter-spacing: 0.45em;
  font-weight: 700;
  background: linear-gradient(90deg, var(--amber), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand .tagline {
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.transport {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: 1;
  flex-wrap: wrap;
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid var(--panel-edge);
  color: var(--text);
  background: var(--panel);
  transition: all 0.15s ease;
}

button:hover { border-color: var(--amber); color: var(--amber); }

button.play {
  padding: 10px 26px;
  font-size: 16px;
  font-weight: 600;
  background: linear-gradient(135deg, rgba(255, 184, 77, 0.18), rgba(77, 214, 193, 0.12));
  border-color: rgba(255, 184, 77, 0.45);
  color: var(--amber);
}

button.play.playing {
  border-color: rgba(255, 111, 97, 0.6);
  color: var(--rose);
  background: linear-gradient(135deg, rgba(255, 111, 97, 0.14), rgba(177, 140, 255, 0.10));
}

button.ghost { padding: 8px 14px; color: var(--dim); }
button.ghost.small { padding: 4px 10px; }

.clock { display: flex; flex-direction: column; gap: 6px; min-width: 150px; }

#timeDisplay {
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--text);
}

#progress {
  height: 3px;
  background: var(--track);
  border-radius: 2px;
  overflow: hidden;
}

#progressBar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--amber), var(--teal));
  border-radius: 2px;
  transition: width 0.3s linear;
}

.readouts { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--panel-edge);
  background: var(--panel);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  min-width: 54px;
  text-align: center;
  color: var(--teal);
}

#keyDisplay { color: var(--amber); }
#sectionDisplay { color: var(--violet); }

/* ---------- visualization ---------- */
#vizwrap {
  position: relative;
  height: 300px;
  border-bottom: 1px solid var(--panel-edge);
  background: linear-gradient(180deg, rgba(18, 24, 38, 0.6), rgba(11, 14, 20, 0.2));
}

#viz { width: 100%; height: 100%; display: block; }

#vizHint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dim);
  letter-spacing: 0.3em;
  font-size: 12px;
  text-transform: uppercase;
  pointer-events: none;
  transition: opacity 0.8s;
}

#vizHint.hidden { opacity: 0; }

/* ---------- controls ---------- */
#controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  padding: 18px 22px;
  flex: 1;
  align-items: start;
}

.group {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 14px;
  padding: 16px 18px 14px;
}

.group h2 {
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 12px;
}

.ctl {
  display: grid;
  grid-template-columns: 96px 1fr 56px;
  align-items: center;
  gap: 10px;
  margin-bottom: 9px;
}

.ctl label {
  font-size: 12.5px;
  color: var(--text);
  cursor: help;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ctl output {
  font-size: 11.5px;
  color: var(--dim);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.ctl.sel { grid-template-columns: 96px 1fr; }
.ctl.seedrow { grid-template-columns: 96px 1fr auto; }

select, input[type="number"] {
  font: inherit;
  font-size: 12.5px;
  color: var(--text);
  background: var(--bg1);
  border: 1px solid var(--panel-edge);
  border-radius: 7px;
  padding: 6px 8px;
  width: 100%;
}

select:focus, input:focus { outline: 1px solid var(--amber); }

/* range styling */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: var(--track);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--amber), var(--teal));
  border: 2px solid var(--bg0);
  box-shadow: 0 0 6px rgba(255, 184, 77, 0.35);
  cursor: pointer;
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--track);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--bg0);
  cursor: pointer;
}

.note {
  margin-top: 12px;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--dim);
}

/* ---------- tooltips ---------- */
#tooltip {
  position: fixed;
  z-index: 99;
  max-width: 280px;
  background: #1c2436;
  border: 1px solid rgba(255, 184, 77, 0.35);
  color: var(--text);
  font-size: 12px;
  line-height: 1.55;
  padding: 8px 12px;
  border-radius: 9px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s ease;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.55);
}

#tooltip.show { opacity: 1; }

/* ---------- footer ---------- */
footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  border-top: 1px solid var(--panel-edge);
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.04em;
  flex-wrap: wrap;
}

@media (max-width: 720px) {
  #vizwrap { height: 200px; }
  .transport { gap: 10px; }
}