.container {
  text-align: center;
  padding: 20px;
  max-width: 700px;
  margin: 0 auto;
  font-family: 'Arial', sans-serif;
}

h1 {
  color: #000000; /* primary color */
}

p {
  color: #333;
}

.btn-row {
  margin: 15px 0;
}

button {
  background-color: #868686; /* primary */
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  cursor: pointer;
  margin: 5px;
  font-size: 1em;
  transition: 0.2s;
}

button:hover {
  background-color: #484848;
  color: #222;
}

select, input[type="number"] {
  padding: 8px;
  border-radius: 6px;
  border: 1px solid #000000;
  margin-top: 5px;
  min-width: 180px;
}

.section {
  margin-top: 20px;
  display: none;
  padding: 15px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background-color: #f9f9f9;
}

pre {
  text-align: left;
  background: #222;
  color: rgb(255, 255, 255);
  padding: 10px;
  border-radius: 6px;
  overflow-x: auto;
}

.results {
  margin-top: 15px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  border: 1px solid #000000;
  border-radius: 8px;
  padding: 12px;
  background-color: #f0f8ff;
  text-align: left;
}

.card h4 {
  margin: 0 0 6px 0;
  color: #000000;
}

.card p {
  margin: 3px 0;
  color: #333;
}

.chords {
  font-family: monospace;
  font-size: 0.85em;
  background: #222;
  color: rgb(255, 255, 255);
  padding: 8px;
  border-radius: 6px;
  overflow-x: auto;
  display: none;
  margin-top: 6px;
}

.show-btn {
  background-color: #868686;
  color: white;
  border: none;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.85em;
  margin-top: 4px;
}

.show-btn:hover {
  background-color: #5c5c5c;
}