@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500&display=swap");

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Inter, sans-serif;
  height: 100vh;
  background-color: #1a1a1a;
  display: flex;
  justify-content: center;
  align-items: center;
}

.input-group {
  font-size: 1.25rem;
  position: relative;
  --primary: #2196f3;
}

.input {
  all: unset;
  color: #fefefe;
  padding: 1rem;
  border: 1px solid #9e9e9e;
  border-radius: 10px;
  transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.label {
  position: absolute;
  top: 1rem;
  left: 1rem;
  color: #d4d4d4;
  pointer-events: none;
  transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.input:focus {
  border: 1px solid var(--primary);
}

.input:is(:focus, :valid) ~ label {
  transform: translateY(-120%) scale(0.7);
  background-color: #1a1a1a;
  padding-inline: 0.3rem;
  color: var(--primary);
}