* {
  box-sizing: border-box;
}

body {
  color: #333338;
}

form {
  font: 1rem/1.5em sans-serif;
  margin: 4em auto;
  width: 95%;
}
@media (min-width: 670px) {
  form {
    width: 50%;
  }
}
form div {
  margin: 1em 0;
  position: relative;
  transition: margin 200ms ease-in-out;
  transform: translateZ(0);
}
form div label {
  color: #767676;
  position: absolute;
  left: calc(.618em + 2px);
  top: calc(.618em + 2px);
  transition: top 200ms ease-in-out, left 200ms ease-in-out, color 200ms ease-in-out;
  transform: translateZ(0);
}
form div.active, form div.complete {
  margin-top: 2.618em;
}
form div.active::first-of-type, form div.complete::first-of-type {
  margin-top: 1em;
}
form div.active label, form div.complete label {
  left: 0;
  top: -1.618em;
  color: #333338;
}

label {
  font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
textarea {
  -webkit-appearance: none;
  width: 100%;
  padding: 0.618rem;
  font-size: 1rem;
  border-radius: 3px;
  border: 2px solid #ebebeb;
  background: #fafafa;
  transition: border 200ms ease-in-out;
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
textarea:focus {
  outline: none;
  border-color: #34c1fc;
}

input[type="checkbox"] {
  width: 2em;
  position: relative;
  overflow: hidden;
  margin: 0 0.5em 0 0;
  padding: 0;
  border: 0;
  outline: 0;
  opacity: 0;
}
input[type="checkbox"] + label {
  position: relative;
  transform: translateZ(0);
}
input[type="checkbox"] + label::before {
  content: "";
  width: 1.2em;
  height: 1.2em;
  display: block;
  position: absolute;
  top: 0;
  left: -1.8em;
  border: 2px solid #ebebeb;
  border-radius: 3px;
  background: #fafafa;
  vertical-align: top;
  box-sizing: border-box;
  transform: translateZ(0);
  transition: border 200ms ease-in-out, transform 200ms ease-in-out, background 200ms ease-in-out, height 200ms ease-in-out;
}
input[type="checkbox"]:focus {
  outline: 0;
}
input[type="checkbox"]:focus + label::before {
  border-color: #34c1fc;
}
input[type="checkbox"]:checked + label::before {
  border-color: #037EB2;
  border-top: 0;
  border-right: 0;
  border-radius: 0;
  transform: rotate(-45deg);
  height: 0.618em;
  background: transparent;
}
input[type="checkbox"]:checked:focus + label::before {
  border-color: #34c1fc;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 1em;
}

legend {
  float: left;
  width: 100%;
  display: block;
  margin-bottom: 1em;
  font-size: 0.9rem;
}
legend span {
  color: #767676;
}