body {
  font-family: Arial, sans-serif;
  background-color: #e6dccf; /* beige */
  color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #f4efe6;
  padding: 20px;
  border-radius: 10px;
  width: 480px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

h1 {
  text-align: center;
}

/* Top menu styled to resemble HP-12C calculator colors */
.top {
  margin-bottom: 8px;
}

.top-menu {
  display: flex;
  gap: 8px;
  justify-content: center;
  background: #111; /* dark calculator body */
  padding: 8px;
  border-radius: 8px;
}

.top-menu a {
  background: #d9822b; /* gold/orange key */
  color: #080808;
  padding: 6px 10px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
  font-size: 13px;
}

.top-menu a:hover {
  background: #e6a25a;
}

.desc {
  text-align: center;
  font-size: 14px;
  margin: 8px 0 12px 0;
  color: #333;
}

button {
  background-color: #444;
  color: white;
  border: none;
  padding: 10px;
  margin-top: 10px;
  width: 100%;
  cursor: pointer;
}

button:hover {
  background-color: #677;
}

.choice {
  background: #d9d2c3;
  margin: 5px 0;
  padding: 10px;
  cursor: pointer;
  border-radius: 5px;
}

.choice:hover {
  background: #c9c1b0;
}

.choice.disabled {
  pointer-events: none;
  opacity: 0.6;
}

.selected {
  background: #d9822b; /* orange accent */
  color: white;
}

#feedback {
  margin-top: 10px;
  padding: 10px;
  border-radius: 5px;
  background: #fff5d6;
  color: #333;
  border: 1px solid #e3d3a1;
}

#feedback.hidden {
  display: none;
}

button.secondary {
  background-color: #888;
  margin-top: 8px;
}

.small-footer {
  margin-top: 10px;
  text-align: center;
}

.small-link {
  font-size: 11px;
  color: #666;
  text-decoration: none;
}

.small-link:hover {
  text-decoration: underline;
}

.hidden {
  display: none;
}