#grid {
  display: grid;
  grid-template-columns: repeat(4, 200px);
  gap: 8px;
  margin-top: 20px;
  background-color: #15121b;       /* near-black plum */
  border: 2px solid #b8913f;       /* gold rim */
  width: fit-content;
  padding: 15px;
  margin-left: auto;
  margin-right: auto;
}

.cell {
  width: 200px;
  height: 200px;
  background: #241d2c;             /* empty cell: dark violet */
  color: #f3ead8;                  /* cream text by default */
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  font-weight: bold;
}

/* low tiles: cream and parchment */
.val-2 {
  background-color: #f3ead8;
  color: #2a1f2b;
}

.val-4 {
  background-color: #e3cfa6;
  color: #2a1f2b;
}

/* mid tiles: the purple, green and coral of the network lines */
.val-8 {
  background-color: #8f7ad6;
}

.val-16 {
  background-color: #6a52b8;
}

.val-32 {
  background-color: #3fa37a;
}

.val-64 {
  background-color: #2a7a5a;
}

.val-128 {
  background-color: #d9546a;
}

/* high tiles: the poker-chip burgundy */
.val-256 {
  background-color: #a8243a;
}

.val-512 {
  background-color: #7e1a2c;
}

/* top tiles: gold */
.val-1024 {
  background-color: #c9a24a;
  color: #2a1f2b;
}

.val-2048 {
  background-color: #e0b85a;
  color: #2a1f2b;
  box-shadow: 0 0 24px #e0b85a99;
}

/* beyond 2048: dark centre with a gold rim, like the chip's middle */
.val-4096 {
  background-color: #2a2133;
  color: #e0b85a;
  box-shadow: inset 0 0 0 4px #c9a24a;
}

.val-8192 {
  background-color: #7e1a2c;
  color: #e0b85a;
  box-shadow: inset 0 0 0 4px #c9a24a;
}