汉堡按钮动画

Question

我正在尝试重写一个汉堡按钮（这是示例动画*：

https://codepen.io/iurii-gavryliuk/pen/dyNwyvL) 不使用任何框架（上面的示例使用“指南针样式”）。

到目前为止，我实现了动画，但是圆形动画很粗：

* {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  font-family: arial;
}

body {
  padding: 0;
  margin: 0;
  text-align: center;
  font-family: arial;
}

section {
  height: 300px;
  padding-top: 100px;
  float: left;
  width: 50%;
  position: relative;
}


/*==============++++================*/

.menu {
  height: 100px;
  width: 100px;
  position: relative;
  margin: auto;
  padding-top: 20px;
  border: 5px solid transparent;
  border-radius: 100%;
  transition: all 0.3s;
  cursor: pointer;
}

.bar {
  height: 5px;
  width: 70px;
  display: block;
  margin: 10px auto;
  position: relative;
  background-color: #fff;
  border-radius: 10px;
  transition: all 0.4s;
}

.model-6 {
  background-color: #EEBA1A;
}

.model-6 .menu {
  overflow: hidden;
}

.model-6 .menu:after {
  content: "";
  width: 90%;
  height: 90%;
  left: 0;
  top: 0;
  position: absolute;
  border: 5px solid transparent;
  border-radius: 100%;
}

.model-6 .menu:hover:after {
  animation-name: circle-creation;
  animation-duration: 1s;
  animation-direction: forwards;
  animation-timing-function: ease-in-out;
}

.model-6 .menu:hover .bar:nth-of-type(1) {
  transform: translateY(15px) rotate(45deg);
}

.model-6 .menu:hover .bar:nth-of-type(2) {
  transform: translateX(100px);
  transition: all 0.6s;
}

.model-6 .menu:hover .bar:nth-of-type(3) {
  transform: translateY(-15px) rotate(-45deg);
}

@keyframes circle-creation {
  0% {
    border-color: transparent;
    transform: translate(0deg);
  }
  25% {
    border-color: transparent #fff transparent transparent;
    transform: translate(-35deg);
  }
  50% {
    border-color: transparent #fff #fff transparent;
  }
  75% {
    border-color: transparent #fff #fff #fff;
  }
  100% {
    border-color: #fff;
    transform: translate(-300deg);
  }
}

<section class="mod model-6">
  <div class="menu">
    <div class="bar"></div>
    <div class="bar"></div>
    <div class="bar"> </div>
  </div>
</section>

如何实现与原始动画相同（或相似）的圆形动画？

谢谢！

*原件在这里看到：https://codepen.io/vineethtrv/pen/VYRzaV