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

body {
  background: #fff;
  color: #000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.618;
  display: flex;
  flex-flow: column nowrap;
  min-height: 100vh;
}

.main {
  flex: 1;
  margin: 3rem;
  position: relative;
}

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

.header,
.footer {
  padding: 1rem 0;
}

.branding {
  color: hsl(219, 64%, 35%);
  text-align: center;
}

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

.color-cycle {
  display: flex;
  flex-flow: row wrap;
  gap: 2rem;
  align-items: center;
}

.color-cycle__preview,
.color-cycle__settings {
  flex: 1 1 min(calc(100vw - 2rem), calc(80ch / 2 - 1rem));
}

.preview {
  border: 1px solid #ccc;
  height: 20rem;
  margin-bottom: 2rem;
}

.form__fieldset {
  display: flex;
  flex-flow: row wrap;
  gap: 1rem;
  margin: 1rem 0;
  padding: 0.8rem 1rem 1.2rem;
}

.form__legend {
  color: hsl(219, 64%, 35%);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0 0.8rem;
}

.form__label {
  display: block;
  cursor: pointer;
}

.form__input {
  padding: 0.2rem 0.5rem;
}

.btn,
.form__input {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

.btn {
  background: #fff;
  border: 2px solid hsl(219, 64%, 35%);
  border-radius: 5px;
  color: hsl(219, 64%, 35%);
  font-weight: 600;
  cursor: pointer;
  display: block;
  margin: auto;
  padding: 0.5rem 1rem;
}

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

.btn:active {
  background: hsl(219, 64%, 25%);
  color: #fff;
}

.notification {
  background: #fff;
  border: 2px solid hsl(0, 64%, 35%);
  color: hsl(0, 64%, 35%);
  font-weight: 600;
  padding: 1rem;
  position: absolute;
  right: 1rem;
  bottom: 1rem;
}