body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 1rem;
  background: #f0f4f8;
}

main {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1, h2 {
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

input, select, button {
  padding: 0.6rem;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid #ccc;
}

button {
  background: #0077cc;
  color: white;
  border: none;
  cursor: pointer;
  margin-top: 1rem;
}

button:hover {
  background: #005fa3;
}

#resultat {
  margin-top: 2rem;
  padding: 1rem;
  background: #e6f7ff;
  border-left: 4px solid #0077cc;
}

canvas {
  margin-top: 2rem;
  max-width: 100%;
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }

  main {
    padding: 1rem;
  }
}