:root {
  --bg: #060a10;
  --panel: #0d141d;
  --cyan: #00e5ff;
  --mag: #ff4bd8;
  --green: #3cff9a;

  /* Themed tokens (dark = default) */
  --text: #cbd5e1;
  --body-bg:
    radial-gradient(ellipse at 20% 0%, rgba(0,229,255,0.08), transparent 55%),
    radial-gradient(ellipse at 90% 100%, rgba(255,75,216,0.08), transparent 55%),
    linear-gradient(160deg, #060a10 0%, #04070c 100%);
  --panel-bg: linear-gradient(180deg, rgba(20,30,42,0.75), rgba(9,14,20,0.85));
  --panel-inset: inset 0 1px 0 rgba(255,255,255,0.04), 0 8px 32px rgba(0,0,0,0.5);
  --surface: rgba(0,0,0,0.35);
  --border-soft: rgba(255,255,255,0.15);
  --border-faint: rgba(255,255,255,0.05);
  --ctl-bg: rgba(255,255,255,0.03);
  --ctl-hover: rgba(255,255,255,0.08);
  --input-bg: rgba(0,0,0,0.45);
  --range-track: rgba(255,255,255,0.15);
  --scan-color: rgba(0,0,0,0.06);
  --scan-blend: multiply;
}

/* ── LIGHT THEME ─────────────────────────────────────────────
   A "daylight terminal": clean paper background, dark readable
   text, neon accents darkened just enough to pass on white. */
body[data-theme="light"] {
  --text: #17212b;
  --body-bg:
    radial-gradient(ellipse at 20% 0%, rgba(0,150,180,0.10), transparent 55%),
    radial-gradient(ellipse at 90% 100%, rgba(200,40,160,0.10), transparent 55%),
    linear-gradient(160deg, #eef3f7 0%, #dde5ec 100%);
  --panel-bg: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(238,244,248,0.92));
  --panel-inset: inset 0 1px 0 rgba(255,255,255,0.6), 0 8px 28px rgba(30,50,70,0.15);
  --surface: rgba(255,255,255,0.7);
  --border-soft: rgba(30,50,70,0.25);
  --border-faint: rgba(30,50,70,0.1);
  --ctl-bg: rgba(30,50,70,0.05);
  --ctl-hover: rgba(30,50,70,0.12);
  --input-bg: rgba(255,255,255,0.85);
  --range-track: rgba(30,50,70,0.2);
  --scan-color: rgba(30,50,70,0.04);
  --scan-blend: normal;

  --cyan: #0088a6;
  --mag: #c0219a;
  --green: #159a5f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--body-bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  min-height: 100vh;
  transition: color 0.3s, background 0.3s;
}

/* In light mode keep faint helper text legible */
body[data-theme="light"] .opacity-40 { opacity: 0.7; }
body[data-theme="light"] .opacity-50 { opacity: 0.75; }
body[data-theme="light"] .opacity-60 { opacity: 0.8; }
body[data-theme="light"] .opacity-70 { opacity: 0.85; }
body[data-theme="light"] .text-slate-200,
body[data-theme="light"] .text-slate-300 { color: var(--text) !important; }

.font-orbitron { font-family: 'Orbitron', sans-serif; }

/* CRT scanlines overlay */
.scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 2px,
    var(--scan-color) 3px,
    transparent 4px
  );
  mix-blend-mode: var(--scan-blend);
  opacity: 0.6;
}
@media (prefers-reduced-motion: reduce) {
  .scanlines { display: none; }
}

.panel {
  background: var(--panel-bg);
  backdrop-filter: blur(4px);
  box-shadow: var(--panel-inset);
}

.neon-title {
  color: var(--text);
  text-shadow: 0 0 12px rgba(0,229,255,0.4), 0 0 40px rgba(255,75,216,0.15);
}
body[data-theme="light"] .neon-title {
  text-shadow: 0 0 10px rgba(0,136,166,0.25);
}

.cursor-blink { animation: blink 1s steps(2) infinite; }
@keyframes blink { 0%,50% { opacity: 1; } 51%,100% { opacity: 0; } }

.led {
  width: 10px; height: 10px; border-radius: 50%;
  display: inline-block;
  transition: all 0.3s;
}

.drop-zone {
  border: 2px dashed;
  background: rgba(0,0,0,0.25);
  transition: all 0.2s;
}
.drop-zone.drag-over {
  background: rgba(0,229,255,0.08);
  transform: scale(1.01);
}

.wf-canvas {
  background: var(--surface);
  border: 1px solid var(--border-faint);
}

/* GPU-composited playhead: moves via transform only — never triggers a
   waveform redraw or React re-render of the heavy peak path. */
.wf-playhead {
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: #fff;
  box-shadow: 0 0 6px rgba(255,255,255,0.7);
  pointer-events: none;
  will-change: transform;
}
@media (prefers-reduced-motion: reduce) {
  .wf-playhead { box-shadow: none; }
}

.ctl-btn {
  background: var(--ctl-bg);
  border: 1px solid var(--border-soft);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.15s;
}
.ctl-btn:hover { background: var(--ctl-hover); border-color: var(--border-soft); }

.stammer-btn {
  background: linear-gradient(135deg, #0a1620, #0a1620);
  border: 1px solid rgba(0,229,255,0.3);
  color: #5b6b7a;
  cursor: not-allowed;
  transition: all 0.2s;
}
.stammer-btn.ready {
  background: linear-gradient(135deg, rgba(0,229,255,0.15), rgba(255,75,216,0.15));
  border-color: var(--cyan);
  color: #eafcff;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(0,229,255,0.3);
  animation: pulseglow 2.2s ease-in-out infinite;
}
.stammer-btn.ready:hover { box-shadow: 0 0 32px rgba(0,229,255,0.55); transform: translateY(-1px); }
@keyframes pulseglow {
  0%,100% { box-shadow: 0 0 16px rgba(0,229,255,0.25); }
  50% { box-shadow: 0 0 28px rgba(255,75,216,0.4); }
}

.preset-btn {
  background: var(--ctl-bg);
  border: 1px solid var(--border-soft);
  color: var(--text);
  opacity: 0.75;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.03em;
}
.preset-btn:hover { border-color: rgba(0,229,255,0.4); color: #cbd5e1; }
.preset-active {
  background: rgba(0,229,255,0.12);
  border-color: var(--cyan);
  color: #eafcff;
  box-shadow: 0 0 12px rgba(0,229,255,0.25);
}

.input-dark {
  background: var(--input-bg);
  border: 1px solid var(--border-soft);
  color: var(--text);
  outline: none;
}
.input-dark:focus { border-color: var(--cyan); }

.lcd {
  background: linear-gradient(180deg, rgba(0,20,15,0.6), rgba(0,10,8,0.8));
  border: 1px solid rgba(60,255,154,0.15);
  box-shadow: inset 0 0 12px rgba(0,0,0,0.6);
}
body[data-theme="light"] .lcd {
  background: linear-gradient(180deg, rgba(230,245,238,0.9), rgba(210,235,225,0.9));
  border: 1px solid rgba(21,154,95,0.35);
  box-shadow: inset 0 0 10px rgba(21,154,95,0.12);
}

.progress-track { background: rgba(0,0,0,0.5); border: 1px solid rgba(255,255,255,0.08); }
.progress-fill {
  background: linear-gradient(90deg, var(--cyan), var(--mag));
  box-shadow: 0 0 12px rgba(0,229,255,0.5);
  transition: width 0.2s;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 3px;
  background: var(--range-track);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(0,229,255,0.6);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--cyan); border: none;
  box-shadow: 0 0 8px rgba(0,229,255,0.6);
  cursor: pointer;
}

input[type="checkbox"] { accent-color: var(--mag); width: 15px; height: 15px; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: rgba(0,229,255,0.3); border-radius: 4px; }
::-webkit-scrollbar-track { background: rgba(0,0,0,0.3); }