body {
  background: #e6e3dc;
  color: #222;
  text-align: center;
  font-family: sans-serif;
  margin: 0;
  user-select: none;
  overflow-x: hidden;
}

/* ===== Game frame ===== */

#outer {
  position: relative;

  /* responsive width */
  width: 100%;
  max-width: 432px;

  /* maintain original aspect ratio */
  aspect-ratio: 432 / 532;

  margin: 12px auto;

  background: #5a2a2a;
  border: 8px solid #3b1a1a;
  box-sizing: border-box;
}

/* ===== Exit opening ===== */

#outer::after {
  content: "";
  position: absolute;

  bottom: -8px;

  /* centered exit */
  left: calc(50% - 23%);
  width: 46%;

  height: 16px;

  background: #e6e3dc;
}

/* ===== Board ===== */

#board {
  position: absolute;

  top: 8px;
  left: 8px;

  /* fill inside frame */
  width: calc(100% - 16px);
  height: calc(100% - 16px);

  background: rgb(25, 5, 5);

  /* important for mobile dragging */
  touch-action: none;
}

/* ===== Blocks ===== */

.block {
  position: absolute;
  border-radius: 6px;
  border: 2px solid #222;
  overflow: hidden;

  transition:
    left 0.15s ease,
    top 0.15s ease;

  cursor: pointer;
  box-sizing: border-box;
}

.block img {
  position: absolute;
  object-fit: cover;
}

/* subtle hover feedback for desktop */

.block:hover {
  transform: scale(1.03);
}

/* ===== Controls ===== */

#controls {
  margin-top: 12px;
}

/* ===== Buttons ===== */

button {
  padding: 8px 14px;
  margin: 0 6px;

  background: #5a2a2a;
  color: white;

  border: none;
  border-radius: 6px;

  font-size: 15px;

  cursor: pointer;
}

button:hover {
  background: #7a3a3a;
}

/* ===== Mobile adjustments ===== */

@media (max-width: 480px) {
  h2 {
    font-size: 20px;
    margin-top: 10px;
  }

  button {
    padding: 10px 16px;
    font-size: 16px;
  }
}

#levelSelect {
  position: fixed;
  inset: 0;

  background: rgba(0, 0, 0, 0.7);

  display: none;
  justify-content: center;
  align-items: center;
}

#levelImage {
  width: 90%;
  max-width: 548px;
  cursor: pointer;
}