:root {
  --ink: #252136;
  --orange: #ff7657;
  --board: #bbada0;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
  background:
    radial-gradient(circle at 15% 15%, #ffe5a5, transparent 28%),
    radial-gradient(circle at 85% 90%, #c3e8dc, transparent 34%), #fff8ea;
}
.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px;
}
.back {
  position: fixed;
  top: 22px;
  left: 24px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}
.game-shell {
  width: min(550px, 100%);
  padding: 30px;
  background: #fffdf8cc;
  border: 1px solid #fff;
  border-radius: 28px;
  box-shadow: 0 24px 70px #3d2d1d26;
}
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
}
.eyebrow {
  margin: 0;
  color: var(--orange);
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 10px;
}
.game-header h1 {
  font: 800 50px/1 "Baloo 2";
  letter-spacing: -2px;
  margin: 2px 0;
}
.scores {
  display: flex;
  gap: 7px;
}
.score-box {
  min-width: 77px;
  padding: 7px 9px;
  background: #3b3650;
  border-radius: 10px;
  color: #ddd8e9;
  font-size: 9px;
  text-align: center;
  letter-spacing: 1px;
}
.score-box strong {
  display: block;
  color: #fff;
  font-size: 18px;
  letter-spacing: 0;
  margin-top: 2px;
}
.guide {
  font-size: 13px;
  color: #6f6a78;
  line-height: 1.55;
  margin: 16px 0 18px;
}
.guide b {
  color: var(--orange);
}
.board-wrap {
  position: relative;
}
.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 10px;
  aspect-ratio: 1;
  background: var(--board);
  border-radius: 17px;
  overflow: hidden;
}
.cell {
  border-radius: 9px;
  background: #cdc1b4;
}
.tile {
  display: grid;
  place-items: center;
  border-radius: 9px;
  font-weight: 700;
  font-size: clamp(21px, 7vw, 38px);
  transition:
    background 120ms,
    color 120ms;
}
.tiles-layer {
  position: absolute;
  inset: 0;
  padding: 10px;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 10px;
  pointer-events: none;
}
.tile.new {
  animation: appear 180ms ease-out;
}
.tile.merged {
  animation: pop 180ms ease-out;
}
@keyframes appear {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}
@keyframes pop {
  50% {
    transform: scale(1.13);
  }
}
.n2 {
  background: #eee4da;
  color: #776e65;
}
.n4 {
  background: #ede0c8;
  color: #776e65;
}
.n8 {
  background: #f2b179;
  color: #fff;
}
.n16 {
  background: #f59563;
  color: #fff;
}
.n32 {
  background: #f67c5f;
  color: #fff;
}
.n64 {
  background: #f65e3b;
  color: #fff;
}
.n128 {
  background: #edcf72;
  color: #fff;
  font-size: clamp(18px, 6vw, 32px);
}
.n256 {
  background: #edcc61;
  color: #fff;
  font-size: clamp(18px, 6vw, 32px);
}
.n512 {
  background: #edc850;
  color: #fff;
  font-size: clamp(18px, 6vw, 32px);
}
.n1024,
.n2048 {
  background: #edc22e;
  color: #fff;
  font-size: clamp(15px, 5vw, 27px);
}
.game-message {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 3;
  place-items: center;
  background: #fffaf1d9;
  border-radius: 17px;
  text-align: center;
}
.game-message.show {
  display: grid;
}
.game-message h2 {
  font: 800 36px "Baloo 2";
  margin: 0;
}
.game-message p {
  font-size: 13px;
  color: #716b76;
}
.game-message button,
.actions button {
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  font: 700 12px "Space Grotesk";
  cursor: pointer;
}
.game-message button,
.primary {
  background: var(--orange);
  color: #fff;
}
.actions {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
}
.secondary {
  background: #f0ece4;
  color: #67616c;
}
.mobile-pad {
  display: none;
  text-align: center;
  margin: 15px auto 0;
}
.mobile-pad button {
  width: 47px;
  height: 40px;
  margin: 2px;
  border: 0;
  border-radius: 9px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
}
@media (max-width: 600px) {
  .page {
    padding: 18px 12px;
  }
  .back {
    position: static;
    justify-self: start;
    margin-bottom: 14px;
  }
  .game-shell {
    padding: 22px 14px;
  }
  .game-header h1 {
    font-size: 43px;
  }
  .guide {
    margin-top: 12px;
  }
  .mobile-pad {
    display: block;
  }
}