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

html {
  font-size: 62.5%;
}

body {
  font-family: "Poppins", sans-serif;
  font-weight: 400;
  min-height: 100vh;
  background-color: hsl(0, 0%, 86%);
}

.main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  max-width: 40rem;
  height: 40rem;
  border-radius: 1.5rem;
  background-color: hsl(0, 0%, 100%);
  border-bottom-right-radius: 12rem;
}

label {
  display: block;
  text-transform: uppercase;
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
  color: hsl(0, 1%, 44%);
  letter-spacing: 1.5px;
}

input {
  border: 1.5px solid hsl(0, 0%, 94%);
  border-radius: 5px;
  width: 8.4rem;
  height: 3.2rem;
  font-size: 1.6rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
  padding: 0.8em;
  color: hsl(0, 0%, 8%);
  background-color: hsl(0, 0%, 100%);
}

input:hover {
  cursor: pointer;
}

.top-sec {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 3rem;

  position: relative;
}

hr {
  box-shadow: 0 0 5px hsl(0, 0%, 86%);
  opacity: 0.3;
  width: 85%;
  margin: auto;
}

.day-field,
.month-field,
.year-field {
  height: 7rem;
}

p[class^="empty"],
p[class^="invalid"],
.past-date-error {
  color: hsl(0, 100%, 67%);
}

.hide {
  display: none;
}

.calc-result-btn {
  background-color: hsl(259, 100%, 65%);
  width: 4.6rem;
  height: auto;
  padding: 1rem;
  border-radius: 100%;

  position: absolute;
  bottom: -2rem;
  right: 2.4rem;
  z-index: 9999;
}

.calc-result-btn:hover {
  cursor: pointer;
  background-color: hsl(0, 0%, 8%);
}

.output-sec {
  padding: 2.4rem 0 0 3.2rem;
}

.output-sec div {
  font-size: 4.8rem;
  display: flex;
  gap: 1rem;
  font-weight: 800;
  font-style: italic;
}

.output-sec div p:nth-child(2) {
  color: hsl(0, 0%, 8%);
}

.output-sec div p:first-child {
  color: hsl(259, 100%, 65%);
}

.attribution {
  font-size: 11px;
  text-align: center;
}
.attribution a {
  color: hsl(228, 45%, 44%);
}

@media (max-width: 37rem) {
  html {
    font-size: 60.5%;
  }
  .container {
    width: 35rem;
    margin: 0 2.4rem;
  }

  .calc-result-btn {
    bottom: -4rem;
    right: 45%;
  }

  .top-sec {
    margin-bottom: 2rem;
  }
}