我试图动画我的输入标签移动后，点击它的工作方式是点击输入后，一个类，其中包含我想要的动画分配给标签，但它不工作。

let $ = document
let usernameInputLabel = $.querySelector(".username-input-label")
let usernameInput = $.querySelector(".username-input")

let isFocused = false

function focusAnimation() {
  if (isFocused) {
    usernameInputLabel.classList.remove(".username-focus-label-animation")
    usernameInputLabel.classList.add(".username-blur-label-animation")
    isFocused = false
  } else {
    usernameInputLabel.classList.add(".username-focus-label-animation")
    usernameInputLabel.classList.remove(".username-blur-label-animation")
    isFocused = true
  }
}
usernameInput.addEventListener("click", focusAnimation)

* {
  margin: 0;
  padding: 0;
  font-family: urbanist;
}

body {
  height: 100vh;
  background-color: #496d8d;
  display: flex;
  justify-content: center;
  align-items: center;
}

form {
  width: 130%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

input {
  border: none;
  border-bottom: 1px solid #082c4c;
  width: 100%;
  background-color: #224f3900;
  padding: 0.2rem 0 0.2rem 0;
  z-index: 99999;
  position: relative;
  color: #ddd;
  font-size: 1.5rem;
  font-weight: 100;
}

input:focus {
  outline: none;
}

.group {
  width: 60%;
}

label {
  display: inline-block;
  transform: translate(0, 2.1rem);
  user-select: none;
  color: #ddd;
}

.username-focus-label-animation {
  animation: usenramefocusLabelAnimation 700ms forwards;
}

@keyframes usenramefocusLabelAnimation {
  from {
    transform: translate(0, 2.1rem);
  }
  to {
    transform: translate(0, 0.1rem);
  }
}

.username-blur-label-animation {
  animation: usenrameBlurLabelAnimation 700ms forwards;
}

@keyframes usenrameBlurLabelAnimation {
  from {
    transform: translate(0, 0.1rem);
  }
  to {
    transform: translate(0, 2.1rem);
  }
}

button:not(.show-password) {
  background-color: #082c4c;
  scale: 1.8;
  padding: 0.3rem;
  border: none;
  border-radius: 10%;
  cursor: pointer;
  color: #ddd;
  box-shadow: 0 5px 5px 2px #082c4c70, 0 2px 10px -1px #0f497b inset;
  transition: 500ms;
}

button:not(.show-password):hover {
  box-shadow: 0 0px 0px 0px #082c4c70, 0 2px 10px -1px #0f497b inset;
  background-color: #07345b;
}

.heading {
  font-size: 4rem;
  color: #ddd;
  font-weight: 200;
  text-align: center;
  text-shadow: 0 5px 10px #082c4c90, 0 15px 10px #082c4c90, 0 25px 10px #082c4c90;
}

.login-container {
  width: 30%;
  height: 90vh;
  padding: 0.5rem;
  backdrop-filter: blur(20px);
  background-color: #1d5582;
  border-radius: 10%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  gap: 3rem;
  box-shadow: 0 10px 50px 1px #082c4c inset
}

<div class="login-container">
  <p class="heading">sign in to your account</p>
  <form>
    <div class="username-group group">
      <label class="username-input-label " for="username-input">User name</label>
      <input class="username-input" type="text">
    </div>
    <div class="password-group group">
      <label class="password-input-label" for="password-input">password</label>
      <input class="password-input" type="text">
      <!-- <button class="show-password">show password</button>    -->
    </div>
    <div class="confirm-password-group group">
      <label class="confirm-password-input-label" for="confirm-password-input">confirm password</label>
      <input class="confirm-password-input"></input>
    </div>
    <div class="email-group group">
      <label class="email-input-label" for="email-input">email adress</label>
      <input class="email-input"></input>
    </div>
  </form>
  <button class="sign-up">sign up</button>
</div>

动画编写正确，功能似乎工作正常。我看不出有什么问题