@import url("https://fonts.googleapis.com/css2?family=Poppins&display=swap");

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background-color: #9331d4;
  font-family: "Poppins", sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

h2 {
  font-size: 2.5rem;
  text-align: center;
  color: #fff;
  margin-top: 50px;
  margin-left: 15px;
  transition: color 0.3s ease;
  animation: changeColor 2s infinite;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-fill-mode: forwards;
  animation-play-state: running;
}

.piano-container {
  margin-top: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 894px;
}

.piano-keys-list {
  list-style: none;
  display: flex;
  justify-content: center;
}

.piano-keys {
  width: 5rem;
  cursor: pointer;
  position: relative;
  height: 20rem;
  border-radius: 10px;
  border: 1px solid #000;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.white-key {
  background-color: #fff;
}

.black-key {
  width: 2rem;
  height: 13rem;
  border-radius: 5px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  background-color: #000;
  z-index: 2;
  margin: 0 -20px 0 -20px;
}

.piano-keys:active {
  transform: scale(0.95);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Keyboard Guide */
.keyboard-guide {
  text-align: center;
  color: white;
  font-size: 1.2rem;
  margin-top: 20px;
  margin-left: 30px;
  background-color: rgba(0, 0, 0, 0.6);
  padding: 10px;
  border-radius: 5px;
}

.keyboard-guide strong {
  color: #ffd700;
  font-weight: bold;
}

/* Responsive Design */
@media screen and (max-width: 576px) {
  .piano-container {
    width: 400px;
    margin-left: 15px;
    margin-bottom: 30px;
  }
  .piano-keys {
    width: 60px;
    height: 12rem;
  }
  .black-key {
    width: 0.8rem;
    height: 6rem;
  }
  h2 {
    margin-top: 180px;
  }
}
@media screen and (max-width: 399px) {
  .piano-container {
    width: 380px;
  }
  .piano-keys {
    width: 50px;
    height: 12rem;
  }
  .black-key {
    width: 0.8rem;
    height: 6rem;
  }
  h2 {
    margin-top: 150px;
  }
}