body {
  font-family: "Sans", Roboto, sans-serif;
  background: #f4f4f7;
  color: #222;
  text-align: center;
  margin: 0;
  padding: 0;
}

nav {
  background: linear-gradient(90deg, lightblue, indigo);
  padding: 10px 0;
  margin-bottom: 20px;
}


.navbtn {
  display: inline-block;
  background: transparent;
  color: white;
  text-decoration: none;
  font-size: 15px;
  margin: 0 10px;
  padding: 8px 14px;
  border-radius: 6px;
}

.navbtn:hover {
  background: indigo;
}

h1 {
  margin-top: 10px;
  font-weight: 600;
}

canvas {
  border: 2px solid #333;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 12px black;
  margin: 20px auto;
  display: block;
}

button, input[type="range"], label {
  margin: 8px;
  font-size: 15px;
}

button {
  background: indigo;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 6px 14px;
  box-shadow: 0 2px 6px black;
}

button:hover {
  background: lightblue;
}

button:active {
  transform: scale(0.98);
}

p {
  font-size: 0.9rem;
}

footer {
  margin-top: 40px;
  font-size: 0.85rem;
}