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

html,
body {
  display: flex;
  font-family: Arial, Helvetica, sans-serif;
  width: 100%;
  height: 100vh;
  justify-content: start;
  align-items: center;
  flex-direction: column;
  background: #6d6875;
}

.start-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 0.5em;
  font-size: rem;
  margin-top: 2em;
  color: #ffcdb2;
}

h1 {
  font-size: 3em;
  color: #f5ebe0;
  margin: 0.5em auto;
}

input {
  width: 100%;
  line-height: 1.5em;
  border-radius: 0.5em;
  padding: 0.5em;
  background-color: #edede9;
}

input:focus {
  background-color: #ffcdb2;
}

.game-start-btn,
.game-restart-btn {
  width: 80%;
  line-height: 2em;
  background-color: #e5989b;
  color: white;
  font-size: 0.8em;
  border: none;
  border-radius: 0.5em;
  margin-top: 2em;
  padding: 0.2em;
}

a {
  text-decoration: none;
}

.memory-game {
  display: none;
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffcdb2;
}

.score-display-container {
  display: flex;
  gap: 0.5em;
  align-items: center;
  flex-direction: column;
  margin-top: 1rem;
  font-size: 1.2rem;
  color: #f5ebe0;
}

.card-container {
  display: grid;
  grid-template-columns: repeat(6, 6rem);
  grid-template-rows: repeat(4, 6rem);
  gap: 2rem;
}

.card {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 800ms linear;
  transform-style: preserve-3d;
}

.front,
.back {
  width: 100%;
  height: 100%;
  position: absolute;
  border-radius: 0.2em;
  box-shadow: 0 0 5px 2px rgba(50, 50, 50, 0.25);
  pointer-events: none;
}

.back {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f5ebe0;
  backface-visibility: hidden;
  text-align: center;
  font-size: x-large;
  color: #6d6875;
}

.selectedCard {
  transform: rotateY(180deg);
}

.game-restart-btn {
  visibility: hidden;
}

a {
  color: white;
  text-decoration: none;
}

footer {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: 0.8em;
  margin-top: 3em;
  text-align: center;
}