body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial;

  /* 🎨 default colors */
  --c1: #74ebd5;
  --c2: #ACB6E5;

  background: linear-gradient(270deg, var(--c1), var(--c2));
  background-size: 400% 400%;

  animation: moveGradient 8s ease infinite;
}

/* 🔥 animation */
@keyframes moveGradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* UI box */

.box {
  position: relative;
  z-index: 2;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(20px);
  padding: 25px;
  border-radius: 20px;
  text-align: center;
  width: 300px;
  color: white;

  box-shadow: 0 0 30px rgba(0,0,0,0.3);

  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

/* 🧊 3D hover */
.box:hover {
  transform: scale(1.05);
  box-shadow: 0 0 60px rgba(0,0,0,0.5);
}


input {
  padding: 10px;
  width: 70%;
  border: none;
  border-radius: 5px;
  font: 1em sans-serif;
  font-weight: 400;
}

button {
  padding: 10px;
  border: none;
  border-radius: 5px;
  background: black;
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #00eaff;
  color: black;
}

#result {
  margin-top: 20px;
}