输入框聚焦动画实现技巧

<input type="text" class="animated-input" placeholder="点击输入...">

@keyframes focusIn {
  0% {
    outline: 2px solid #007bff;
    outline-offset: 0;
    transform: scale(1);
  }
  50% {
    outline: 4px solid #007bff;
    outline-offset: 2px;
    transform: scale(1.02);
  }
  100% {
    outline: 4px solid #007bff;
    outline-offset: 2px;
    transform: scale(1.02);
  }
}

.animated-input {
  padding: 10px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
  transition: border-color 0.3s ease;
}
<p>.animated-input:focus {
border-color: #007bff;
animation: focusIn 0.4s ease-out forwards;
outline: none; /<em> 避免默认轮廓干扰 </em>/
}</p>

.animated-input {
  transition: all 0.3s ease;
  box-shadow: 0 0 0 rgba(0, 123, 255, 0);
}
<p>.animated-input:focus {
border-color: #007bff;
box-shadow: 0 0 8px rgba(0, 123, 255, 0.6);
}</p>