*,
*::after,
*::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: #fff;
  color: #000;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.618;
  display: flex;
  flex-flow: column nowrap;
  min-height: 100vh;
}

.header,
.main,
.footer {
  width: min(calc(100vw - 2rem), 80ch);
  margin-left: auto;
  margin-right: auto;
}

.header {
  padding: 2rem 0 3rem;
  text-align: center;
}

.main {
  flex: 1;
  display: flex;
  flex-flow: column nowrap;
  align-content: flex-start;
}

.footer {
  margin-top: 2rem;
  padding: 1rem 0;
}

.copyright {
  font-size: 0.9rem;
  text-align: center;
}

.form {
  border: solid 2px hsl(219, 64%, 35%);
  border-radius: 5px;
  padding: 1rem;
  margin: 0 auto;
}

.form__fieldset {
  border: none;
  display: flex;
  flex-flow: row wrap;
  align-items: center;
  gap: 0.5rem;
}

.form__legend {
  color: hsl(219, 64%, 35%);
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.form__label {
  cursor: pointer;
  font-weight: 600;
}

.form__input {
  border: 1px solid hsl(219, 64%, 35%);
  font: inherit;
  line-height: inherit;
  padding: 0.2rem 0.5rem;
}

.btn {
  background: #fff;
  border: 2px solid hsl(219, 64%, 35%);
  color: hsl(219, 64%, 35%);
  font: inherit;
  font-weight: 600;
  line-height: inherit;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
}

.btn:hover,
.btn:focus {
  background: hsl(219, 64%, 35%);
  color: #fff;
}

.error-box {
  border: 1px solid hsl(0, 75%, 38%);
  color: hsl(0, 75%, 38%);
  font-weight: 600;
  margin: 0 auto 2rem;
  padding: 1rem;
  width: max-content;
}

.result-box {
  display: flex;
  gap: 0.5rem;
  margin-top: 2rem;
}

.result-box__label {
  font-weight: 600;
}