:root {
  --bg-color: white;
  --text-color: black;
  --btn-bg: #f8f8f8;
  --btn-text: black;
  --btn-border: #ccc;
  --btn-hover: #eee;
  --rank-selected: #007bff;
  --suit-selected: #dc3545;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --btn-bg: #1e1e1e;
    --btn-text: #e0e0e0;
    --btn-border: #333;
    --btn-hover: #2a2a2a;
    --rank-selected: #2196f3;
    --suit-selected: #e53935;
  }
}

body {
  font-family: sans-serif;
  padding: 0;
  margin: 0;
  text-align: center;
  height: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-color);
  color: var(--text-color);
}

#game-container {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: env(safe-area-inset-top, 1rem) env(safe-area-inset-right, 1rem) env(safe-area-inset-bottom, 1rem) env(safe-area-inset-left, 1rem);
  box-sizing: border-box;
}

.keyboard-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: calc(env(safe-area-inset-bottom, 1rem) + 0.5rem);
}

button {
  padding: 0.4em 0.8em;
  margin: 0.2em;
  font-size: 1em;
  border-radius: 6px;
  border: 1px solid var(--btn-border);
  background-color: var(--btn-bg);
  color: var(--btn-text);
  cursor: pointer;
  transition: background 0.2s ease;
}

button.btn-small {
  font-size: 0.95rem;
  padding: 0.3rem 0.7rem;
  min-width: 2.2rem;
  flex-shrink: 0;
}

button.guess-btn {
  font-size: 0.95rem;
  padding: 0.4rem 1rem;
  margin-top: 0.5rem;
}

button:hover {
  background-color: var(--btn-hover);
}

button.selected-rank {
  background-color: var(--rank-selected);
  color: white;
}

button.selected-suit {
  background-color: var(--suit-selected);
  color: white;
}

.card-flip {
  width: min(60vw, 220px);
  height: calc(min(60vw, 220px) * 1.5);
  margin: 1rem auto;
  perspective: 1000px;
}

.card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

.card-front,
.card-back {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  object-fit: contain;
}

.card-front {
  transform: rotateY(180deg);
}

.card-back {
  z-index: 2;
}

.suit-red {
  color: #e53935;
}
.suit-black {
  color: black;
}

@media (prefers-color-scheme: dark) {
  .suit-black {
    color: #e0e0e0;
  }
}