:root {
  --bg: #0A0E13;
  --synapse: #D9A566;
  --pulse-core: #FFB86B;
  --panel-bg: rgba(18, 21, 26, 0.72);
  --panel-border: #232830;
  --text-primary: #EDEFF2;
  --text-secondary: #9AA3AD;
}

html, body {
  margin: 0;
  overflow: hidden;
  height: 100dvh;
  background: var(--bg);
  font-family: 'Space Grotesk', sans-serif;
}

canvas {
  position: fixed;
  inset: 0;
  display: block;
}

#titleMark {
  position: fixed;
  top: 20px;
  left: 24px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 8px;
}

#titleMark span {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

#infoToggle {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid var(--text-secondary);
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, color 0.15s ease;
}

#infoToggle:hover,
#infoToggle[aria-expanded="true"] {
  border-color: var(--synapse);
  color: var(--synapse);
}

#infoPanel {
  position: fixed;
  top: 56px;
  left: 24px;
  z-index: 10;
  max-width: 340px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 16px 18px;
  backdrop-filter: blur(6px);
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#infoPanel.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#infoPanel h2 {
  margin: 0 0 10px;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

#infoPanel p {
  margin: 0 0 10px;
  color: var(--text-secondary);
  font-size: 12.5px;
  line-height: 1.55;
}

#infoPanel p:last-child {
  margin-bottom: 0;
}

#infoPanel strong {
  color: var(--text-primary);
  font-weight: 600;
}

#legend {
  position: fixed;
  top: 20px;
  right: 24px;
  z-index: 10;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.legend-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 12px;
}

.legend-row .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-segment { background: #3A4550; }
.dot-synapse { background: var(--synapse); }
.dot-pulse { background: var(--pulse-core); }

#controlPanel {
  position: fixed;
  bottom: 20px;
  left: 24px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 14px 16px;
  z-index: 10;
  min-width: 220px;
  backdrop-filter: blur(6px);
}

.panel-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.panel-row:last-child {
  margin-bottom: 0;
}

.panel-row label {
  color: var(--text-secondary);
  font-size: 12px;
  width: 60px;
  flex-shrink: 0;
}

.panel-row.stats {
  color: var(--text-secondary);
  font-size: 11px;
  justify-content: space-between;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--synapse);
}

input[type="checkbox"] {
  accent-color: var(--synapse);
  margin-left: auto;
}

.readout {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
  font-size: 12px;
  min-width: 32px;
  text-align: right;
}

.btn {
  background: transparent;
  border: 1px solid var(--synapse);
  color: var(--synapse);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover {
  background: rgba(217, 165, 102, 0.12);
}

#activityIndicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--panel-border);
  margin-left: auto;
}

#activityIndicator.flash {
  animation: activityFlash 0.6s ease-out;
}

@keyframes activityFlash {
  0% { background: var(--pulse-core); box-shadow: 0 0 8px var(--pulse-core); }
  100% { background: var(--panel-border); box-shadow: none; }
}