.opening-screen {
  position: fixed;
  inset: 0;
  background-color: var(--bg-color);
  z-index: 9990; /* below loading screen (10000) but above everything else */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  box-sizing: border-box;
  height: 100vh;
  height: 100dvh;
  padding: 12px;
  overflow: hidden;
  transition: opacity 0.5s;
}

.opening-grid {
  grid-template-columns: repeat(8, 1fr) !important;
  grid-template-rows: repeat(8, 1fr) !important;
  width: min(90vw, 500px, calc(100vh - 190px)) !important;
  width: min(90vw, 500px, calc(100dvh - 190px)) !important;
  height: min(90vw, 500px, calc(100vh - 190px)) !important;
  height: min(90vw, 500px, calc(100dvh - 190px)) !important;
  min-width: 0;
  min-height: 0;
  flex: 0 1 auto;
  gap: 4px !important;
  padding: 8px !important;
  background-color: rgba(43, 76, 126, 0.8) !important; /* Slightly distinct background */
}

.opening-grid .grid-cell {
  font-size: min(4.5vw, 24px) !important;
  background-color: #203a5c; /* Empty cell look */
  color: #f5f7fb;
  border: 1px solid rgba(255,255,255,0.05);
}

.opening-grid .grid-cell.filled {
  background-color: #fdf6e3;
  color: #1a1a1a;
  border: none;
  box-shadow: inset 2px 2px 4px rgba(255, 255, 255, 1), inset -2px -2px 4px rgba(0, 0, 0, 0.15), 2px 2px 4px rgba(0, 0, 0, 0.4);
}

.opening-grid .grid-cell.rank {
  background-color: var(--color-3); /* Gold/orange for rank */
  color: #fff;
  border: none;
}

.opening-grid .grid-cell.top-rank {
  background-color: #ffd700;
  color: #000;
  text-shadow: 0 0 2px rgba(255,255,255,0.8);
}

.play-button-container {
  display: flex;
  gap: 10px;
  margin-top: 30px;
  cursor: pointer;
  padding: 10px;
  flex: 0 0 auto;
}

@media (max-height: 620px) {
  .opening-screen #opening-title {
    margin-bottom: 10px !important;
    font-size: clamp(18px, 4vw, 28px) !important;
  }

  .play-button-container {
    margin-top: 12px;
    padding: 6px;
  }
}

.play-tile {
  width: min(15vw, 60px) !important;
  height: min(15vw, 60px) !important;
  font-size: min(8vw, 32px) !important;
  transition: transform 0.2s;
  box-shadow: inset 2px 2px 5px rgba(255, 255, 255, 0.3), inset -3px -3px 5px rgba(0, 0, 0, 0.3), 2px 3px 5px rgba(0, 0, 0, 0.4) !important;
  border: none !important;
  background-color: var(--color-4) !important; /* Green */
  color: #fff !important;
}

.play-button-container:hover .play-tile {
  transform: scale(1.05) translateY(-2px);
}
.play-button-container:active .play-tile {
  transform: scale(0.95) translateY(2px);
}

.falling-tile {
  animation: fallAway 1.2s forwards cubic-bezier(0.55, 0.085, 0.68, 0.53);
  pointer-events: none;
}

@keyframes fallAway {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(var(--rot, 45deg)); opacity: 0; }
}

.topup-opening-rules {
  max-width: 420px;
  margin: 10px 0 0;
  font-size: 13px;
  color: #d0d8e8;
  text-align: center;
  line-height: 1.45;
}