:root {
  --bg: #0d0d1a;
  --bg2: #141428;
  --bg3: #1a1a2e;
  --panel: rgba(20, 20, 44, 0.85);
  --border: rgba(0, 212, 255, 0.15);
  --blue: #00d4ff;
  --blue-dim: rgba(0, 212, 255, 0.3);
  --copper: #ff6b35;
  --copper-dim: rgba(255, 107, 53, 0.4);
  --silver: #c0c0c0;
  --green: #00ff88;
  --yellow: #ffd700;
  --red: #ff3355;
  --text: #e0e0e8;
  --text-dim: #7878a0;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'IBM Plex Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
  min-height: 100vh;
}

#app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 12px;
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

#title {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--blue);
  text-shadow: 0 0 20px rgba(0,212,255,0.3);
  letter-spacing: -0.5px;
}

#subtitle {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 200;
  color: var(--text-dim);
  margin-top: 2px;
}

.pulse-icon {
  font-size: 1.5rem;
  color: var(--text-dim);
  transition: color 0.3s;
}

.pulse-icon.active {
  color: var(--blue);
  animation: pulse-glow 1s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%,100% { text-shadow: 0 0 5px rgba(0,212,255,0.3); }
  50% { text-shadow: 0 0 20px rgba(0,212,255,0.8); }
}

/* AUDIO PANEL */
#audio-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
}

#drop-zone {
  position: relative;
  border: 2px dashed var(--blue-dim);
  border-radius: 6px;
  padding: 10px 16px;
  cursor: pointer;
  transition: border-color 0.3s, background 0.3s;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

#drop-zone:hover, #drop-zone.drag-over {
  border-color: var(--blue);
  background: rgba(0,212,255,0.05);
}

#drop-zone input { position:absolute; inset:0; opacity:0; cursor:pointer; }

#transport {
  display: flex;
  align-items: center;
  gap: 6px;
}

.transport-btn {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--mono);
  transition: all 0.2s;
}

.transport-btn:hover:not(:disabled) {
  background: var(--blue-dim);
  border-color: var(--blue);
}

.transport-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

#now-playing {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  font-size: 0.65rem;
  margin-left: 8px;
}

#filename { color: var(--text); max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#timestamp { color: var(--text-dim); }

#seek-container {
  flex: 1;
  min-width: 150px;
  height: 30px;
  cursor: pointer;
}

#seek-canvas { width: 100%; height: 30px; border-radius: 4px; }

#volume-container {
  display: flex;
  align-items: center;
  gap: 4px;
}

#volume-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--blue);
  min-width: 35px;
}

#test-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.test-btn {
  background: var(--bg2);
  border: 1px solid var(--copper-dim);
  color: var(--copper);
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.test-btn:hover { background: var(--copper-dim); border-color: var(--copper); }
.test-btn.active { background: var(--copper-dim); border-color: var(--copper); color: #fff; }

#tone-controls {
  display: flex;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  align-items: center;
}

#tone-controls input[type="range"] { width: 80px; accent-color: var(--copper); }

/* MAIN LAYOUT */
#main-layout {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

#sim-container {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  min-height: 400px;
  position: relative;
}

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

#dashboard {
  width: 240px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  overflow-y: auto;
  max-height: 520px;
}

.dash-title {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 2px;
  margin-bottom: 10px;
  text-align: center;
}

.meter-group {
  margin-bottom: 10px;
}

.meter-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-dim);
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.meter-group canvas { width: 100%; border-radius: 3px; }

.big-number {
  font-family: var(--mono);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--green);
  text-shadow: 0 0 15px rgba(0,255,136,0.3);
  text-align: center;
}

.big-number .unit { font-size: 0.7rem; font-weight: 400; color: var(--text-dim); }

.small-number {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--silver);
  text-align: center;
}

#temp-display { display: flex; align-items: center; gap: 6px; }
#temp-val { font-family: var(--mono); font-size: 0.8rem; color: var(--copper); }

.thd-val {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 800;
  text-align: center;
  color: var(--green);
  transition: color 0.3s;
}

.controls-section {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toggle-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toggle-label input { accent-color: var(--blue); }

#specs-panel {
  margin-top: 8px;
  padding: 8px;
  background: rgba(0,0,0,0.3);
  border-radius: 4px;
}

.spec-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--text-dim);
}

.spec-row span:first-child { width: 32px; color: var(--blue); }
.spec-row span:last-child { width: 60px; text-align: right; }
.spec-row input { flex: 1; accent-color: var(--blue); }

.spec-info {
  font-family: var(--mono);
  font-size: 0.55rem;
  color: var(--text-dim);
  margin-top: 6px;
  line-height: 1.6;
  text-align: center;
}

/* SPECTRUM */
#spectrum-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 12px;
}

#spectrum-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.spectrum-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 2px;
}

#spectrum-modes { display: flex; gap: 4px; }

.mode-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.6rem;
  padding: 3px 8px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn.active { border-color: var(--blue); color: var(--blue); background: rgba(0,212,255,0.1); }

#spectrum-canvas { width: 100%; height: 120px; display: block; border-radius: 4px; }

/* FOOTER */
#footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}

#footer a { color: var(--blue); text-decoration: none; }
#footer a:hover { text-decoration: underline; }

/* RESPONSIVE */
@media (max-width: 900px) {
  #main-layout { flex-direction: column; }
  #dashboard { width: 100%; max-height: none; }
  #sim-container { min-height: 320px; }
  #audio-panel { flex-direction: column; }
  #seek-container { width: 100%; }
}

@media (max-width: 600px) {
  #title { font-size: 1rem; }
  .big-number { font-size: 1.3rem; }
  #dashboard { padding: 8px; }
}