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

:root {
  --green: hsl(75, 94%, 57%);
  --white: hsl(0, 0%, 100%);
  --grey: hsl(0, 0%, 20%);
  --dark-grey: hsl(0, 0%, 12%);
  --off-black: hsl(0, 0%, 8%);
}

body {
  font-family: "Inter", sans-serif;
  display: grid;
  place-content: center;
  min-height: 100vh;
  background-color: var(--off-black);
  text-align: center;
  padding: 4rem 1rem;
  color: var(--white);
}

.card {
  width: 320px;
  height: 480px;
  perspective: 1000px;
  margin: 0 auto;
  position: relative;
  transition: border-color 1s;
  border: 3px solid var(--green);
  border-radius: 1rem;
}

.card:hover {
  border-color: var(--white);
}

.card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.card.flipped .card__inner {
  transform: rotateY(180deg);
}

.card__face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background-color: var(--dark-grey);
  border-radius: 1rem;
  padding: 2rem;
  color: var(--white);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card__face--back {
  transform: rotateY(180deg);
  justify-content: center;
  align-items: center;
}

.card__image img {
  display: block;
  max-width: 100%;
  margin: 0 auto;
  border-radius: 50%;
  width: 7rem;
  height: 7rem;
}

.card .card__details {
  padding: 1rem;
}

.card .card__details h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.card .card__details p {
  color: var(--green);
  padding-top: 0.5rem;
  font-weight: 600;
}

.card .card__quote {
  padding: 0.5rem;
}

.card ul {
  list-style: none;
}

.card li {
  margin-top: 1rem;
}

.card li > a {
  display: block;
  width: 100%;
  max-width: 350px;   
  max-height: 60px; 
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--white);
  background-color: var(--grey);
  border-radius: 0.5rem;
  font-weight: 700;
}

.card li > a:hover {
  background-color: var(--green);
  color: var(--white);
  box-shadow: var(--green) 0px 7px 29px 0px;
}

.card li > a:active {
  background-color: var(--green);
  color: var(--white);
  box-shadow: var(--green) 0px 7px 29px 0px;
  transform: translateY(10px);
  transition: 100ms;
}

#toggleButton,
#backButton {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border: none;
  background-color: var(--green);
  color: var(--off-black);
  font-weight: bold;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#toggleButton:hover,
#backButton:hover {
  background-color: var(--green);
  color: var(--white);
  box-shadow: var(--green) 0px 7px 29px 0px;
}

#toggleButton:active,
#backButton:active {
  background-color: var(--green);
  color: var(--white);
  box-shadow: var(--green) 0px 7px 29px 0px;
  transform: translateY(10px);
  transition: 100ms;
}

@media screen and (min-width: 768px) {
  body {
    padding: 6rem 1rem;
  }
}

@media screen and (min-width: 1440px) {
  body {
    padding: 8rem 1rem;
  }
}