body {
  font-family: sans-serif;
  margin: 1em;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 500px;
  margin: 0 auto;
  padding: 1em;
}

input[type="text"],
input[type="number"],
input[type="button"],
select,
button {
  width: 100%;
  max-width: 100%;
  margin: 0.5em 0;
  padding: 0.75em;
  font-size: 1em;
  box-sizing: border-box;
}

label {
  display: block;
  text-align: left;
  margin-top: 1em;
  font-weight: bold;
}

.options {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5em;
  margin-top: 0.5em;
}

.options label {
  font-weight: normal;
  flex: 1 1 auto;
  white-space: nowrap;
}

button {
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #555;
}

.advanced-toggle {
  background-color: transparent;
  color: #666;
  font-size: 0.9em;
  border: none;
  padding: 0.25em 0.5em;
  text-decoration: underline;
  cursor: pointer;
}

.advanced-toggle:hover {
  background-color: transparent; /* no dark background */
  color: #000; /* darker on hover for contrast */
}