@font-face {
  font-family: "Crete Round";
  src:
    url("https://card-factory.info/fonts/creteround-regular-webfont.woff2")
      format("woff2"),
    url("https://card-factory.info/fonts/creteround-regular-webfont.woff")
      format("woff");
  font-weight: normal;
  font-style: normal;
}

:root {
  --card-flip-speed: 0.3s;
  --card-size: 75px;
  --border-color: black;
}

.card-container {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: auto;
  box-sizing: border-box;
  border-radius: calc(0.15 * var(--card-size));
}

.card-parent * {
  padding: 0;
  margin: 0;
  font-family: "Crete Round", serif;
  font-size: 1rem;

  /* Prevents text from being highlighted on cards */
  -webkit-user-select: none; /* Safari */
  -ms-user-select: none; /* IE 10 and IE 11 */
  user-select: none; /* Standard syntax */
  cursor: default;
}

.card-parent {
  padding: 0;
  width: calc(var(--card-size) * 2.5);
  height: calc(var(--card-size) * 3.5);
  display: grid;
}

.card-parent * {
  font-size: calc((var(--card-size) * 3.5) / 10);
}

.card-front,
.card-back {
  box-sizing: border-box;
  border-radius: calc(0.15 * var(--card-size));
  width: 100%;
  height: 100%;
  transition: transform var(--card-flip-speed) ease;
  position: absolute;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.card-back {
  background-color: #222240;
  transform: perspective(1000px) rotateY(180deg);
  border-bottom: 1px rgba(0, 0, 0, 0.541) solid;
}

.card-back.flipped {
  transform: perspective(1000px) rotateY(0deg);
}

.card-front {
  padding: calc(var(--card-size) / 15);
  background-color: whitesmoke;
  border: calc(0.05 * var(--card-size)) solid var(--border-color);
  transform: perspective(1000px) rotateY(0deg);
}

.card-front.flipped {
  --flip-direction: 180deg;
  transform: perspective(1000px) rotateY(-180deg);
}

.card-background-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: red;
  box-sizing: border-box;
  border-radius: calc(0.15 * var(--card-size));
  clip-path: inset(0 round calc(0.15 * var(--card-size)));
  opacity: 0; /* Hidden by default */
  transition: opacity 0.3s;
}

.card-shadow {
  box-shadow:
    rgba(0, 0, 0, 0.25) 0px 14px 28px,
    rgba(0, 0, 0, 0.22) 0px 10px 10px;
}