.container {
  max-width: 1100px;
  margin: auto;
  padding: 15px;
}

/* FLEX LAYOUT */
.card {
  display: flex;
  gap: 20px;
}

/* PANELS */
.inputs, .results {
  flex: 1;
  background: #fff;
  padding: 18px;
  border-radius: 12px;
  box-sizing: border-box;
}

/* SLIDERS */
.slider-group {
  margin-bottom: 18px;
}

.slider-group label {
  font-size: 14px;
}

.value {
  float: right;
  color: #4CAF50;
  font-weight: bold;
}

input[type=range] {
  width: 100%;
  margin-top: 8px;
}

/* TOGGLE */
.toggle {
  display: flex;
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
}

.toggle button {
  flex: 1;
  padding: 10px;
  border: none;
  background: #eee;
  font-size: 14px;
}

.toggle button.active {
  background: #4CAF50;
  color: white;
}

/* RESULTS */
.result-box {
  font-size: 14px;
  margin-bottom: 8px;
}

/* CHART */
canvas {
  width: 100% !important;
  max-height: 250px;
}

/* 📱 MOBILE FIX */
@media (max-width: 768px) {

  .card {
    flex-direction: column; /* STACK */
  }

  .inputs, .results {
    width: 100%;
    padding: 15px;
  }

  h2 {
    font-size: 20px;
  }

  .toggle button {
    font-size: 13px;
    padding: 8px;
  }

  .result-box {
    font-size: 13px;
  }

  canvas {
    max-height: 220px;
  }
}