* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: #111;
  color: #f5f5f5;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  margin: 0 0 24px 0;
  font-size: 56px;
  font-weight: 800;
}

.controls {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: end;
  margin-bottom: 24px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 260px;
  font-size: 18px;
  font-weight: 600;
}

button, select {
  font-size: 20px;
  padding: 14px 18px;
  border-radius: 18px;
  border: 1px solid #444;
  background: #1d1d1d;
  color: #fff;
}

button {
  cursor: pointer;
}

.meter-panel {
  background: #161616;
  border: 1px solid #2f2f2f;
  border-radius: 24px;
  padding: 18px;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  background: #000;
  border-radius: 18px;
}

.readout {
  margin-top: 18px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  color: #ddd;
  font-size: 18px;
}