:root {
  --bg: #0a0b10;
  --panel: #161821;
  --ink: #e7e9ee;
  --mute: #8a92a6;
  --accent: #ffcc33;
  --good: #4ade80;
  --bad: #f87171;
  --rec: #ef4444;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}
html { height: 100%; }
body {
  display: flex; flex-direction: column; min-height: 100vh;
  overflow-y: auto;
}

header {
  padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  border-bottom: 1px solid #21242f; flex-wrap: wrap;
  background: linear-gradient(180deg, #14161e 0%, #0e1016 100%);
}
header h1 { font-size: 16px; margin: 0; letter-spacing: 0.5px; }
header .sub { font-size: 11px; color: var(--mute); margin-top: 2px; }

.controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
button {
  background: #1c1f2b; color: var(--ink); border: 1px solid #2a2e3b;
  padding: 8px 14px; font-weight: 600; border-radius: 6px; cursor: pointer;
  font-size: 13px; letter-spacing: 0.3px;
}
button.primary { background: var(--rec); border-color: var(--rec); color: #fff; }
button.primary:hover { background: #dc2626; }
button:hover:not(:disabled) { background: #252a38; }
button:disabled { opacity: 0.4; cursor: not-allowed; }
.status { font-size: 12px; color: var(--mute); margin-left: 8px; }
.status.err { color: var(--bad); }
.status.rec { color: var(--rec); font-weight: 600; }
.status.rec::before {
  content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--rec); margin-right: 6px; vertical-align: middle;
  animation: pulse 1s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.sens-wrap {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--mute);
  padding: 0 8px;
}
.sens-wrap .sens-lbl { font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }
.sens-wrap input[type=range] {
  width: 90px; accent-color: var(--accent); cursor: pointer; vertical-align: middle;
}
.sens-wrap .sens-val { color: var(--ink); font-variant-numeric: tabular-nums; min-width: 24px; text-align: right; }

.color-wrap { position: relative; }
.color-panel {
  position: absolute; right: 0; top: calc(100% + 6px);
  background: #14161e; border: 1px solid #2a2e3b; border-radius: 8px;
  padding: 12px; width: 280px; z-index: 100;
  box-shadow: 0 10px 32px rgba(0,0,0,0.5);
}
.color-panel .cp-row {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  margin-bottom: 8px; font-size: 12px;
}
.color-panel .cp-tabs label {
  display: inline-flex; align-items: center; gap: 4px; cursor: pointer; color: var(--ink);
}
.color-panel .cp-tabs input[type=radio] { accent-color: var(--accent); }
.color-panel .cp-section { margin: 8px 0 10px; }
.color-panel .cp-hint { color: var(--mute); font-size: 11px; }
.color-panel .cp-single {
  display: flex; gap: 10px; align-items: center; font-size: 12px;
}
.color-panel .cp-single input[type=color] {
  width: 48px; height: 32px; border: 1px solid #2a2e3b; border-radius: 5px;
  padding: 0; background: transparent; cursor: pointer;
}
.color-panel .cp-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px 6px;
}
.color-panel .cp-grid label {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  font-size: 10px; color: var(--mute);
}
.color-panel .cp-grid input[type=color] {
  width: 100%; height: 26px; border: 1px solid #2a2e3b; border-radius: 4px;
  padding: 0; background: transparent; cursor: pointer;
}
.color-panel .cp-actions { justify-content: space-between; margin-top: 4px; margin-bottom: 0; }
.color-panel button.small { padding: 5px 10px; font-size: 11px; }
@media (max-width: 760px) {
  .color-panel { right: auto; left: 0; width: calc(100vw - 32px); max-width: 320px; }
}

main {
  flex: 1; display: flex; flex-direction: column; min-height: 0;
  padding: 12px 16px; gap: 12px;
}
#mainCanvas {
  flex: 1; width: 100%; min-height: 420px;
  background: radial-gradient(ellipse at top, #131520 0%, #07080c 100%);
  border-radius: 10px; border: 1px solid #21242f;
  display: block;
}

.bottom-bar {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 12px;
  min-height: 150px; max-height: 200px;
}
.panel {
  background: var(--panel); border: 1px solid #21242f; border-radius: 10px;
  padding: 12px 16px;
}
.panel h2 {
  margin: 0 0 8px 0; font-size: 11px; text-transform: uppercase;
  letter-spacing: 1.5px; color: var(--mute); font-weight: 600;
}

.info-panel { display: flex; flex-direction: column; gap: 8px; }
.note-display { display: flex; align-items: baseline; gap: 10px; }
.note-name {
  font-size: 48px; font-weight: 700; line-height: 1;
  font-variant-numeric: tabular-nums;
}
.octave {
  font-size: 22px; color: var(--mute);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
}

.info-row {
  display: flex; gap: 18px; flex-wrap: wrap; font-size: 12px;
}
.info { display: flex; flex-direction: column; }
.info .lbl { color: var(--mute); font-size: 10px; text-transform: uppercase; letter-spacing: 1px; }
.info b { font-size: 14px; font-variant-numeric: tabular-nums; }
.info .unit { color: var(--mute); font-size: 10px; margin-left: 2px; }

.tuner {
  height: 22px; position: relative;
  background: #0a0b10; border-radius: 5px; overflow: hidden;
  border: 1px solid #21242f; margin-top: auto;
}
.tuner .center {
  position: absolute; top: 0; bottom: 0; left: 50%;
  width: 2px; background: var(--mute); opacity: 0.5;
}
.tuner .needle {
  position: absolute; top: 3px; bottom: 3px; width: 3px; border-radius: 2px;
  background: var(--mute); left: 50%; transform: translateX(-50%);
  transition: left 80ms ease-out, background 200ms;
}
.tuner .scale {
  position: absolute; inset: 0; display: flex; justify-content: space-between;
  align-items: center; padding: 0 6px; font-size: 9px; color: var(--mute);
  pointer-events: none;
}

.spectrum-panel { display: flex; flex-direction: column; }
.spectrum-panel canvas {
  flex: 1; width: 100%; min-height: 100px;
  background: #0a0b10; border-radius: 6px;
}

@media (max-width: 760px) {
  .bottom-bar { grid-template-columns: 1fr; max-height: none; }
  .note-name { font-size: 36px; }
  header { padding: 10px 14px; }
}