body {
  margin: 0;
  padding: 0;
  background: #000;
  color: #fff;
  font-family: Arial, sans-serif;
}

.content {
  width: min(96vw, 1700px);
  margin: 16px auto 24px auto;
}

.title {
  margin: 0 0 10px 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1.2;
}

.intro {
  width: 100%;
  font-size: 14px;
  line-height: 1.45;
  margin-bottom: 14px;
}

.intro p {
  margin: 0 0 8px 0;
}

.formula {
  margin: 6px 0 8px 0;
  font-size: 18px;
  font-weight: 700;
}

#app {
  position: relative;
  width: 100%;
  height: 78vh;
  min-height: 680px;
  background: #000;
}

canvas {
  display: block;
  outline: 1px solid #333;
}

#controlPanel {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 20;
  width: 260px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#controls {
  display: flex;
  gap: 10px;
  width: 100%;
}

#controls button,
#signalControl select {
  background: #000;
  color: #fff;
  border: 1px solid #fff;
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  font-family: Arial, sans-serif;
}

#controls button {
  flex: 1;
}

#controls button:hover,
#signalControl select:hover {
  background-color: #111;
}

#signalControl {
  position: relative;
  width: 100%;
}

#signalControl select {
  width: 100%;
  padding-right: 38px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

#signalControl::after {
  content: "▼";
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  font-size: 11px;
  pointer-events: none;
}

#pane {
  width: 100%;
}

.copyright {
  position: static !important;
  margin-top: 18px;
  margin-bottom: 8px;
  font-size: 13px;
  color: #aaa;
  text-align: center;
}