.playing-card {
  --card-face: #fffdf8;
  --card-ink: #15283a;
  --card-red: #c6424e;
  --card-highlight: #ffd65a;
  position: relative;
  display: block;
  box-sizing: border-box;
  aspect-ratio: 1 / 1.42;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: clamp(.3rem, .8vw, .55rem);
  background: var(--card-face);
  color: var(--card-ink);
  box-shadow: 0 2px 5px rgba(8,29,35,.32), inset 0 0 0 1px rgba(23,50,77,.17);
  font-family: Georgia, "Times New Roman", serif;
  transition: transform .15s ease, filter .15s ease, box-shadow .15s ease;
}

button.playing-card { cursor: pointer; }
button.playing-card:disabled { cursor: default; }
button.playing-card:not(:disabled):hover { filter: brightness(1.04); transform: translateY(-2px); }
button.playing-card:active { transform: translateY(1px) scale(.98); }
.playing-card:focus-visible {
  z-index: 90 !important;
  outline: 3px solid var(--card-highlight);
  outline-offset: 2px;
}
.playing-card.selected {
  z-index: 80 !important;
  box-shadow: 0 0 0 4px var(--card-highlight), 0 5px 10px rgba(8,29,35,.4);
  transform: translateY(-3px);
}
.playing-card[data-suit="hearts"],
.playing-card[data-suit="diamonds"] { color: var(--card-red); }

.card-corner {
  position: absolute;
  top: 7%;
  left: 10%;
  display: grid;
  justify-items: center;
  line-height: .85;
}
.card-corner b { font-size: 1em; }
.card-corner i { font-size: .8em; font-style: normal; }
.card-corner-bottom {
  inset: auto 10% 7% auto;
  rotate: 180deg;
}
.card-suit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding-top: 13%;
  font-size: 2.4em;
  line-height: 1;
}
.playing-card.face-down {
  background: #17324d;
  color: #f5f0e6;
  box-shadow: 0 2px 5px rgba(8,29,35,.36), inset 0 0 0 4px #f5f0e6, inset 0 0 0 6px #d96955;
}
.card-back {
  position: absolute;
  inset: 9px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,.44);
  border-radius: .25rem;
  background: repeating-linear-gradient(45deg, transparent 0 5px, rgba(255,255,255,.09) 5px 7px);
  font: 1.7em/1 Georgia, "Times New Roman", serif;
}