.form {
  max-width: 600px;
  margin: 0 auto;
}
.form-box {
  margin: 30px 0 0 0;
  padding: 0 15px;
}
.form-item {
  display: flex;
  align-items: baseline;
}
.must {
  color: var(--white);
  background-color: var(--color1);
  margin: 0 10px 0 0;
  padding: 5px 10px;
}
label {
  margin: 5px 0 0 0;
  padding: 0;
}
input[type="text"] {
  width: calc(100% - 20px);
  height: 40px;
  font-size: 16px;
  border: 1px solid var(--color3);
  border-radius: 6px;
  background-color: var(--white);
  margin: 10px 0 0 0;
  padding: 5px 10px;
}
input[type="radio"] {
  opacity: 0;
  position: absolute;
}
input[type="radio"]:focus-visible + .radio-circle {
  outline: auto 1px;
}
.radio {
  display: flex;
  align-items: center;
  width: 50%;
  height: 40px;
  background-color: var(--white);
  border: 1px solid var(--color3);
  border-radius: 6px;
  margin: 10px 0 0 0;
  padding: 5px 10px;
  cursor: pointer;
}
.radio-circle {
  border-radius: 50%;
  border: 1px solid var(--color4);
  width: 24px;
  height: 24px;
  background-color: var(--white);
  display: inline-block;
  position: relative;
  margin-right: 10px;
}
.radio-circle::after {
  position: absolute;
  content: "";
  border-radius: 50%;
  width: 14px;
  height: 14px;
  background-color: var(--color4);
  top: 50%;
  transform: translateY(-50%);
  left: 5px;
  opacity: 0;
}
input[type="radio"]:checked + .radio-circle::after {
  opacity: 1;
}
.side-by-side {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--gap-3xs);
}
.btn-back, .btn-next {
  width: 50%;
  height: 50px;
  margin: 30px 0 0 0;
}
.btn-back a {
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 50px;
  text-decoration: none;
  background-color: var(--color5);
  border-radius: var(--br-3xs);
}
.btn-next {
  color: var(--white);
  background-color: var(--color1);
  border: none;
  border-radius: var(--br-3xs);
  cursor: pointer;
}

.thanks {
  text-align: center;
  margin: 50px 0;
}