body {
  font-family: "Segoe UI", sans-serif;
  background: linear-gradient(to bottom, #f4f4f4, #dfe6e9);
  margin: 0;
  padding: 0;
  color: #2d3436;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  text-align: center;
  padding: 40px 20px;
  flex-grow: 1;
}

h1 {
  font-size: 2.5rem;
  color: #0984e3;
  margin-bottom: 0.2em;
}

.tagline {
  font-style: italic;
  color: #636e72;
  margin-bottom: 30px;
}

#piano {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

#piano button {
  background-color: #74b9ff;
  color: white;
  font-size: 1.2rem;
  border: none;
  padding: 20px 30px;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.3s ease;
}

#piano button:hover {
  background-color: #0984e3;
  transform: scale(1.05);
}

.instructions {
  margin-top: 20px;
  font-size: 1rem;
  color: #2d3436;
}

footer {
  text-align: center;
  font-size: 0.9rem;
  padding: 20px;
  background-color: #dfe6e9;
  color: #636e72;
  border-top: 1px solid #b2bec3;
}