/* =============================================================================
   VisiSynth — Signal Laboratory
   Dark laboratory aesthetic: deep space background, phosphor green displays,
   warm amber/cyan cable accents, hardware panel module cards.
   ============================================================================= */

/* ── Custom Properties ──────────────────────────────────────────────────────── */
:root {
  /* Background hierarchy */
  --bg-base: #060810;
  --bg-panel: #0c0e18;
  --bg-module: #1e0910;
  /* dark maroon */
  --bg-header: #0a0b14;
  --bg-scope: #04060c;

  /* Module card accent colors */
  --border-module: #3c1422;
  /* maroon border */
  --border-active: #8c204b;
  /* active maroon border */

  /* Signal type colors */
  --col-audio: #00cfff;
  /* cyan  — audio signal cables */
  --col-mod: #ffaa00;
  /* amber — LFO / modulation cables */
  --col-env: #44ff88;
  /* green — envelope cables */

  /* UI text */
  --text-primary: #c8d0e8;
  --text-dim: #8ba0e8;
  --text-label: #a37588;
  /* maroon/rose label text */
  --text-accent: #dca3ba;
  /* maroon/rose accent text */

  /* Knob & control */
  --knob-body: #2a101b;
  --knob-ring: #4e2034;
  --knob-indicator: #d0a840;

  /* Phosphor scope */
  --scope-green: #00ff9f;
  --scope-dim: rgba(0, 255, 140, 0.06);

  /* Misc */
  --radius-card: 8px;
  --radius-sm: 4px;
  --shadow-glow-audio: 0 0 12px rgba(0, 207, 255, 0.35);
  --shadow-glow-mod: 0 0 12px rgba(255, 170, 0, 0.35);
  --shadow-glow-env: 0 0 12px rgba(68, 255, 136, 0.35);
}

/* ── Reset ──────────────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
}

body {
  font-family: 'Space Grotesk', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
}

/* ── App Header ─────────────────────────────────────────────────────────────── */
.app-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 78px;
  background: var(--bg-header);
  border-bottom: 1px solid #141830;
  z-index: 10;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  font-size: 26px;
  color: var(--col-audio);
  filter: drop-shadow(0 0 6px var(--col-audio));
  line-height: 1;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1.1;
}

.brand-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #e0e8ff;
}

.brand-sub {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.header-center {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.master-vol-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctrl-label {
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--text-label);
  text-transform: uppercase;
  font-family: 'Space Mono', monospace;
}

.master-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 90px;
  height: 4px;
  background: var(--border-module);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.master-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--col-audio);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--col-audio);
  cursor: grab;
}

.master-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.power-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #141828;
  border: 1px solid #252840;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.2s;
}

.power-btn .power-icon {
  font-size: 14px;
}

.power-btn:hover {
  border-color: var(--col-audio);
  color: var(--col-audio);
}

.power-btn.active {
  background: rgba(0, 207, 255, 0.1);
  border-color: var(--col-audio);
  color: var(--col-audio);
  box-shadow: var(--shadow-glow-audio);
}

/* ── Main Workspace ─────────────────────────────────────────────────────────── */
.app-workspace {
  flex: 1;
  order: 2;
  position: relative;
  overflow: auto;
  padding: 16px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-height: 0;
}

.module-row {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
  align-items: flex-start;
}

/* ── Module Cards ───────────────────────────────────────────────────────────── */
.module-card {
  background: var(--bg-module);
  border: 1px solid var(--border-module);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  min-width: 110px;
  position: relative;
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: visible;
}

.module-card:hover {
  border-color: #541e30;
}

.module-card.adjusting {
  border-color: var(--border-active) !important;
  box-shadow: 0 0 16px rgba(140, 32, 75, 0.6) !important;
}

.module-card.bypassed {
  opacity: 0.45;
}

/* Subtle left-edge glow bar */
.module-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--col-audio);
  border-radius: 1px;
  opacity: 0;
  transition: opacity 0.3s;
}

.module-card:hover::before {
  opacity: 0.3;
}

.module-mod::before {
  background: var(--col-mod);
}

.module-output::before {
  background: var(--col-env);
}

.module-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px 6px;
  border-bottom: 1px solid #30101b;
}

.mod-icon {
  font-size: 13px;
  color: var(--text-dim);
  width: 16px;
  text-align: center;
}

.mod-name {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--text-accent);
  text-transform: uppercase;
  flex: 1;
}

.bypass-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--text-dim);
  font-size: 12px;
  width: 20px;
  height: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  padding: 0;
}

.bypass-btn:hover {
  border-color: #ff6644;
  color: #ff6644;
}

.bypass-btn.active {
  background: rgba(255, 100, 68, 0.15);
  border-color: #ff6644;
  color: #ff6644;
}

.module-body {
  padding: 10px 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.ctrl-row .ctrl-label {
  width: 34px;
  flex-shrink: 0;
  text-align: right;
}

/* ── Knobs ──────────────────────────────────────────────────────────────────── */
.knob-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}

.knob {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #44182a, #1a0810 60%);
  border: 2px solid var(--knob-ring);
  position: relative;
  cursor: grab;
  transition: border-color 0.15s, box-shadow 0.15s;
  flex-shrink: 0;
}

.knob:hover {
  border-color: #384060;
  box-shadow: 0 0 10px rgba(100, 120, 200, 0.2);
}

.knob.dragging {
  cursor: grabbing;
  border-color: var(--col-audio);
  box-shadow: 0 0 14px rgba(0, 207, 255, 0.3);
}

/* Knob indicator line */
.knob::after {
  content: '';
  position: absolute;
  width: 2px;
  height: 38%;
  background: linear-gradient(to top, transparent, var(--knob-indicator));
  bottom: 50%;
  left: calc(50% - 1px);
  transform-origin: bottom center;
  transform: rotate(var(--knob-rotation, -135deg));
  border-radius: 2px;
}

/* Knob outer groove arc (decorative) */
.knob::before {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: rgba(220, 100, 140, 0.12);
  border-right-color: rgba(220, 100, 140, 0.08);
}

.knob-val {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  color: var(--text-dim);
  text-align: center;
  white-space: nowrap;
  min-width: 40px;
}

/* ── Sliders (ADSR) ─────────────────────────────────────────────────────────── */
.mini-slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 3px;
  background: var(--border-module);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.mini-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--col-env);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--col-env);
  cursor: grab;
}

.mini-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.slider-val {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  color: var(--text-dim);
  min-width: 38px;
  text-align: right;
}

.adsr-body {
  gap: 6px;
}

.slider-row {
  align-items: center;
}

/* ── Wave Select Buttons ────────────────────────────────────────────────────── */
.wave-select {
  display: flex;
  gap: 2px;
}

.wave-btn {
  width: 22px;
  height: 22px;
  background: #190910;
  border: 1px solid var(--border-module);
  border-radius: 3px;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  padding: 0;
}

.wave-btn:hover {
  border-color: var(--border-active);
  color: var(--text-accent);
}

.wave-btn.active {
  background: rgba(0, 207, 255, 0.12);
  border-color: var(--col-audio);
  color: var(--col-audio);
  box-shadow: 0 0 8px rgba(0, 207, 255, 0.2);
}

/* ── Select Controls ────────────────────────────────────────────────────────── */
.select-ctrl {
  background: #190910;
  border: 1px solid var(--border-module);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  padding: 3px 6px;
  cursor: pointer;
  outline: none;
  flex: 1;
}

.select-ctrl:hover {
  border-color: var(--border-active);
}

.select-ctrl:focus {
  border-color: var(--col-audio);
}

/* ── Module Jacks ───────────────────────────────────────────────────────────── */
.module-jacks {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 6px 8px 10px;
  border-top: 1px solid #30101b;
  gap: 4px;
  flex-wrap: wrap;
}

.jacks-in,
.jacks-out {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.jacks-out {
  align-items: flex-end;
}

.jack {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  padding: 2px 0;
  transition: opacity 0.15s;
}

.jack-in {
  flex-direction: row;
}

.jack-out {
  flex-direction: row-reverse;
}

.jack-lbl {
  font-family: 'Space Mono', monospace;
  font-size: 8px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  transition: color 0.15s;
}

.jack-hole {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #0a0b14;
  border: 2px solid #50283c;
  position: relative;
  transition: all 0.15s;
  flex-shrink: 0;
}

/* Inner dot */
.jack-hole::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: #2a121e;
  transition: background 0.15s;
}

/* Audio jack: cyan ring */
.jack[data-type="audio"] .jack-hole {
  border-color: #0073b3;
}

.jack[data-type="audio"]:hover .jack-hole {
  border-color: var(--col-audio);
  box-shadow: 0 0 8px rgba(0, 207, 255, 0.4);
}

/* Mod jack: amber ring */
.jack[data-type="mod"] .jack-hole,
.mod-jack .jack-hole {
  border-color: #40300a;
}

.jack[data-type="mod"]:hover .jack-hole,
.mod-jack:hover .jack-hole {
  border-color: var(--col-mod);
  box-shadow: 0 0 8px rgba(255, 170, 0, 0.4);
}

/* Env jack: green ring */
.jack[data-type="env"] .jack-hole,
.env-jack .jack-hole {
  border-color: #0a3020;
}

.jack[data-type="env"]:hover .jack-hole,
.env-jack:hover .jack-hole {
  border-color: var(--col-env);
  box-shadow: 0 0 8px rgba(68, 255, 136, 0.4);
}

/* Connected state */
.jack.connected .jack-hole {
  border-width: 2px;
}

.jack[data-type="audio"].connected .jack-hole {
  border-color: var(--col-audio);
  background: rgba(0, 207, 255, 0.12);
  box-shadow: 0 0 6px rgba(0, 207, 255, 0.3);
}

.jack[data-type="audio"].connected .jack-hole::after {
  background: var(--col-audio);
  opacity: 0.5;
}

.jack[data-type="mod"].connected .jack-hole {
  border-color: var(--col-mod);
  background: rgba(255, 170, 0, 0.12);
  box-shadow: 0 0 6px rgba(255, 170, 0, 0.3);
}

.jack[data-type="mod"].connected .jack-hole::after {
  background: var(--col-mod);
  opacity: 0.5;
}

.jack[data-type="env"].connected .jack-hole {
  border-color: var(--col-env);
  background: rgba(68, 255, 136, 0.12);
  box-shadow: 0 0 6px rgba(68, 255, 136, 0.3);
}

.jack[data-type="env"].connected .jack-hole::after {
  background: var(--col-env);
  opacity: 0.5;
}

/* Active (pending cable from this jack) */
.jack.active .jack-hole {
  animation: jackPulse 0.8s ease-in-out infinite;
}

@keyframes jackPulse {

  0%,
  100% {
    box-shadow: 0 0 6px rgba(255, 255, 100, 0.4);
    border-color: rgba(255, 255, 100, 0.8);
  }

  50% {
    box-shadow: 0 0 14px rgba(255, 255, 100, 0.8);
    border-color: rgba(255, 255, 255, 0.9);
  }
}

/* Highlight: compatible target */
.jack.highlight-valid .jack-hole {
  border-color: #aaff44 !important;
  box-shadow: 0 0 10px rgba(170, 255, 68, 0.5) !important;
  animation: validPulse 0.7s ease-in-out infinite;
}

@keyframes validPulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.7;
  }
}

.jack.highlight-valid .jack-lbl {
  color: #aaff44;
}

/* Highlight: incompatible target */
.jack.highlight-invalid {
  opacity: 0.25;
  pointer-events: none;
}

/* Rejected (shake) */
.jack.rejected .jack-hole {
  animation: jackReject 0.6s ease-in-out;
}

@keyframes jackReject {

  0%,
  100% {
    transform: translateX(0);
  }

  20% {
    transform: translateX(-4px);
    border-color: #ff4444;
  }

  40% {
    transform: translateX(4px);
    border-color: #ff4444;
  }

  60% {
    transform: translateX(-3px);
    border-color: #ff4444;
  }

  80% {
    transform: translateX(2px);
    border-color: #ff4444;
  }
}

/* ── Output Module ──────────────────────────────────────────────────────────── */
.module-output {
  min-width: 90px;
}

.vu-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
}

.vu-meter {
  width: 18px;
  height: 60px;
  background: #0a0b14;
  border: 1px solid var(--border-module);
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.vu-bar {
  width: 100%;
  height: 0%;
  background: #00cc66;
  transition: height 0.04s linear, background 0.1s;
  border-radius: 2px 2px 0 0;
}

.vu-db {
  font-family: 'Space Mono', monospace;
  font-size: 8px;
  color: var(--text-dim);
  white-space: nowrap;
}

.mod-note {
  font-size: 9px;
  color: var(--text-dim);
  font-style: italic;
  text-align: center;
  line-height: 1.4;
}

/* ── LFO + ADSR modules ─────────────────────────────────────────────────────── */
.module-mod .module-header {
  border-bottom-color: #140e00;
}

.module-mod::before {
  background: var(--col-mod);
}

/* ── Keyboard Module ────────────────────────────────────────────────────────── */
.keyboard-module {
  flex: 1;
  background: var(--bg-module);
  border: 1px solid var(--border-module);
  border-radius: var(--radius-card);
  padding: 8px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 300px;
  max-width: 600px;
}

.kb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #141830;
  padding-bottom: 6px;
}

.kb-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.kb-header .mod-icon {
  font-size: 14px;
}

.kb-header .mod-name {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--text-accent);
  text-transform: uppercase;
}

.keyboard {
  display: flex;
  gap: 3px;
  height: 80px;
}

.octave {
  position: relative;
  display: flex;
  gap: 2px;
  flex: 1;
}

.piano-key {
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  border: none;
  transition: background 0.05s, transform 0.05s;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
}

.piano-key:focus {
  outline: 2px solid var(--col-audio);
  outline-offset: 1px;
}

.piano-key.white {
  flex: 1;
  background: #d0d8e8;
  height: 100%;
  border: 1px solid #9098b0;
  z-index: 1;
}

.piano-key.white:hover {
  background: #e0e8f8;
}

.piano-key.white.pressed {
  background: var(--col-audio);
  transform: scaleY(0.97);
  transform-origin: top center;
}

.piano-key.black {
  position: absolute;
  top: 0;
  width: 8.3%;
  height: 62%;
  background: #181c28;
  border: 1px solid #0a0c14;
  border-top: none;
  z-index: 2;
  transform: translateX(-50%);
}

.piano-key.black:hover {
  background: #242838;
}

.piano-key.black.pressed {
  background: var(--col-audio);
  transform: translateX(-50%) scaleY(0.97);
  transform-origin: top center;
}

.key-label {
  font-family: 'Space Mono', monospace;
  font-size: 7px;
  color: #6070a0;
  pointer-events: none;
}

.piano-key.white.pressed .key-label {
  color: #040810;
}

.kb-hint {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  color: var(--text-dim);
  text-align: center;
  letter-spacing: 0.05em;
}

/* ── SVG Cable Overlay ──────────────────────────────────────────────────────── */
.cable-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
  z-index: 5;
}

/* Individual cable paths have pointer-events: auto (set in JS) */
.cable-path {
  stroke-dasharray: 8, 6;
}

.cable-audio {
  animation: cableFlow 0.8s linear infinite;
}

.cable-mod {
  animation: cableFlow 2.0s linear infinite;
}

.cable-env {
  animation: cableFlow 1.5s linear infinite;
}

.cable-dangling {
  stroke-dasharray: none !important;
  animation: none !important;
}

@keyframes cableFlow {
  to {
    stroke-dashoffset: -14;
  }
}

/* ── Visualization Panel ────────────────────────────────────────────────────── */
.viz-panel {
  flex: 1;
  order: 1;
  min-height: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid #141830;
  padding: 10px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.viz-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.probe-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.viz-label {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--text-label);
  text-transform: uppercase;
}

.viz-mode-wrap {
  display: flex;
  gap: 6px;
}

.viz-mode-btn {
  padding: 4px 12px;
  background: var(--bg-module);
  border: 1px solid var(--border-module);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
}

.viz-mode-btn:hover {
  border-color: var(--border-active);
  color: var(--text-accent);
}

.viz-mode-btn.active {
  background: rgba(0, 207, 255, 0.1);
  border-color: var(--col-audio);
  color: var(--col-audio);
}

.viz-displays {
  display: flex;
  gap: 12px;
  flex: 1;
  min-height: 0;
}

.scope-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.scope-label {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--scope-green);
  opacity: 0.7;
  text-transform: uppercase;
}

.scope-canvas {
  flex: 1;
  width: 100%;
  background: var(--bg-scope);
  border: 1px solid #141828;
  border-radius: var(--radius-sm);
  display: block;
}

/* Scanline texture overlay on scopes */
.scope-canvas {
  position: relative;
}

.scope-wrap::after {
  content: '';
  position: absolute;
  inset: 18px 0 0 0;
  background: repeating-linear-gradient(0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.06) 2px,
      rgba(0, 0, 0, 0.06) 4px);
  pointer-events: none;
  border-radius: var(--radius-sm);
}

.scope-wrap {
  position: relative;
}

/* ── Signal Inspector ───────────────────────────────────────────────────────── */
.signal-inspector {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 6px 0 2px;
  border-top: 1px solid #141828;
}

.insp-item {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.insp-key {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  min-width: 30px;
}

.insp-val {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--scope-green);
  min-width: 60px;
}

/* ── Status Bar ─────────────────────────────────────────────────────────────── */
.status-bar {
  flex-shrink: 0;
  order: 3;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 16px;
  background: #080912;
  border-top: 1px solid #141828;
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  min-height: 26px;
}

.status-icon {
  color: var(--col-audio);
  font-size: 8px;
  animation: statusBlink 2s ease-in-out infinite;
}

@keyframes statusBlink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.3;
  }
}

#status-text {
  transition: color 0.3s;
}

/* ── Init Overlay ───────────────────────────────────────────────────────────── */
.init-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 6, 14, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.init-card {
  text-align: center;
  max-width: 420px;
  padding: 36px 40px;
  background: var(--bg-module);
  border: 1px solid var(--border-module);
  border-radius: 16px;
  box-shadow: 0 0 80px rgba(0, 50, 50, 0.3), 0 0 30px rgba(0, 30, 80, 0.5);
}

.init-logo {
  font-size: 48px;
  color: var(--col-audio);
  filter: drop-shadow(0 0 20px var(--col-audio));
  margin-bottom: 20px;
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

.init-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #e0e8ff;
  margin-bottom: 4px;
}

.init-subtitle {
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.init-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: linear-gradient(135deg, #1020a0, #0828c8);
  border: 1px solid var(--col-audio);
  border-radius: 8px;
  color: #fff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 0 20px rgba(0, 100, 255, 0.3);
}

.init-btn:hover {
  background: linear-gradient(135deg, #1830c8, #0a38f0);
  box-shadow: 0 0 30px rgba(0, 150, 255, 0.5);
  transform: translateY(-1px);
}

.init-btn:active {
  transform: translateY(0);
}

.init-btn-icon {
  font-size: 18px;
}

.init-hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 16px;
  font-style: italic;
}

.init-legend {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
  font-family: 'Space Mono', monospace;
  font-size: 10px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.audio-legend {
  color: var(--col-audio);
}

.mod-legend {
  color: var(--col-mod);
}

.env-legend {
  color: var(--col-env);
}

/* ── Scrollbar styling ──────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
  background: var(--border-module);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #283060;
}

/* ── Focus styles ───────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 1px solid var(--col-audio);
  outline-offset: 2px;
}

button:focus-visible,
select:focus-visible {
  outline: 1px solid var(--col-audio);
}

/* ── Keyboard Jacks in Header ── */
.keyboard-jacks {
  border-top: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.keyboard-jacks .jacks-out {
  flex-direction: row !important;
  gap: 12px;
}

/* ── Hold Dots on Piano Keys ── */
.hold-dot {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.4);
  cursor: pointer;
  z-index: 10;
  transition: background 0.15s, box-shadow 0.15s, border-color 0.15s;
}

.piano-key.white .hold-dot {
  left: calc(50% - 5px);
  bottom: 16px;
  background: rgba(0, 0, 0, 0.12);
}

.piano-key.black .hold-dot {
  left: calc(50% - 5px);
  top: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

.hold-dot:hover {
  background: var(--col-audio) !important;
  box-shadow: 0 0 6px var(--col-audio);
  border-color: #fff;
}

.hold-dot.held {
  background: var(--col-env) !important;
  /* bright envelope green */
  box-shadow: 0 0 8px var(--col-env);
  border-color: #fff;
}

/* ── VCA Tremolo LED Indicator ── */
.vca-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-module);
  border: 1px solid #0d0f1a;
  margin-left: auto;
  margin-right: 6px;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.vca-led.active {
  background: var(--col-mod);
  /* LFO amber */
  box-shadow: 0 0 8px var(--col-mod), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}