body {
  background: lightblue;
  color: #fff;
  font-family: 'Fira Mono', 'Consolas', monospace;
  margin: 0;
}
.container {
  max-width: 450px;
  margin: 60px auto;
  padding: 32px;
  background: #1f242f;
  border-radius: 20px;
  box-shadow: 0 8px 24px #0005;
  text-align: center;
}
h1 {
  font-size: 2rem;
  margin-bottom: 24px;
  color: #23aaff;
  letter-spacing: 1px;
}
form {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 18px;
}
label {
  display: flex;
  align-items: center;
  gap: 8px;
}
input[type="number"], input[type="text"], input[type="color"] {
  padding: 5px;
  border-radius: 6px;
  border: 1px solid #444;
  background: #333;
  color: #fafbff;
  width: 70px;
}
input[type="checkbox"] {
  transform: scale(1.2);
}
button {
  background: #23aaff;
  color: #fff;
  font-size: 1rem;
  border: none;
  border-radius: 7px;
  padding: 8px 16px;
  transition: background 0.2s;
  cursor: pointer;
  margin-top: 10px;
}
button:hover {
  background: #197bbd;
}
pre#pyramidDisplay {
  margin: 30px auto 12px;
  background: #151a22;
  border-radius: 10px;
  box-shadow: 0 2px 8px #0006;
  padding: 24px;
  font-size: 1.2rem;
  color: var(--pyramid-color, #23aaff);
  text-shadow: 0 0 1px #222, 0 0 5px #23aaff66;
  white-space: pre;
  min-height: 22px;
  transition: color 0.2s;
}