body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  margin: 0;
  color: #333;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: #fff;
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.input-group {
  margin-bottom: 15px;
}

label {
  font-weight: 600;
}

input[type=range] {
  width: 100%;
}

input[type=number] {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
}

.result-box {
  background: #f1f5ff;
  padding: 20px;
  border-radius: 10px;
}

.result-box h2 {
  margin: 10px 0;
}

canvas {
  margin-top: 20px;
}

@media(max-width:768px){
  .grid {
    grid-template-columns: 1fr;
  }
}