body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #1f1c2c, #928dab);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  margin: 0;
}

.container {
  background: #2c2c54;
  padding: 40px;
  border-radius: 18px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
  text-align: center;
  width: 100%;
  max-width: 500px;
  transform: perspective(1000px) rotateX(4deg);
  transition: transform 0.3s ease;
}

.container:hover {
  transform: perspective(1000px) rotateX(0deg) scale(1.02);
}

h1 {
  margin-bottom: 20px;
  font-size: 2rem;
  font-weight: 700;
  color: #ffeb3b;
  text-shadow: 0 0 12px #ffeb3b, 0 0 25px #ff9800;
}

#number {
  padding: 12px;
  width: 75%;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
  outline: none;
  margin-bottom: 20px;
  background: #3d3d74;
  color: #fff;
  text-align: center;
  box-shadow: inset 0 0 8px rgba(255, 235, 59, 0.4);
}

#convert-btn {
  display: inline-block;
  padding: 12px 25px;
  background: linear-gradient(45deg, #ff9800, #f44336);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 6px 15px rgba(244, 67, 54, 0.6);
}

#convert-btn:hover {
  background: linear-gradient(45deg, #f44336, #e91e63);
  box-shadow: 0 0 20px #f44336, 0 0 40px #e91e63;
  transform: translateY(-3px);
}

#convert-btn:active {
  transform: translateY(2px) scale(0.97);
}

#output {
  margin-top: 25px;
  font-size: 1.3rem;
  font-weight: bold;
  color: #ffeb3b;
  text-shadow: 0 0 12px #ffeb3b, 0 0 25px #ff9800;
  min-height: 30px;
}