body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #dfe9f3 0%, #ffffff 100%);
  margin: 0;
  padding: 0;
  text-align: center;
  color: #333;
}

.container {
  max-width: 700px;
  margin: 60px auto;
  background: #fff;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

h1 {
  color: #3f51b5;
}

.subtitle {
  color: #555;
  margin-bottom: 25px;
}

.input-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

input {
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 8px;
  width: 60%;
}

button {
  background: #3f51b5;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  cursor: pointer;
  font-weight: 600;
  margin-top: 10px;
  transition: 0.3s;
}

button:hover {
  background: #5c6bc0;
}

canvas {
  margin-top: 30px;
  width: 100%;
  max-width: 650px;
  height: 400px;
}

footer {
  margin-top: 40px;
  padding: 10px;
  color: #777;
  font-size: 14px;
}