/* ============ 粉色主题 2048 ============ */
:root {
  --bg-1: #fff0f6;
  --bg-2: #ffd9e8;
  --text: #7a3b57;
  --text-soft: #b06e8e;
  --board-bg: #f3a7c3;
  --cell-bg: rgba(255, 255, 255, 0.45);
  --accent: #ec5f9d;
  --accent-deep: #d94f8c;
  --btn-bg: #ec5f9d;
  --btn-hover: #d94f8c;

  --board-size: min(92vw, 440px);
  --gap: calc(var(--board-size) / 44);
  --cell-size: calc((var(--board-size) - 2 * var(--gap) - 3 * var(--gap)) / 4);
  --step: calc(var(--cell-size) + var(--gap));
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, var(--bg-1) 0%, var(--bg-2) 100%) fixed;
  display: flex;
  justify-content: center;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

/* 背景柔光装饰 */
body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  pointer-events: none;
  z-index: -1;
}
body::before {
  width: 42vmax; height: 42vmax;
  left: -12vmax; top: -14vmax;
  background: #ffb3d1;
}
body::after {
  width: 38vmax; height: 38vmax;
  right: -10vmax; bottom: -12vmax;
  background: #ffc7de;
}

.game {
  width: var(--board-size);
  padding: 20px 0 28px;
}

/* ---------- 头部 ---------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.title {
  margin: 0;
  font-size: calc(var(--board-size) * 0.15);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1;
  background: linear-gradient(135deg, #e8448f 0%, #f973b4 60%, #fb8fc4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  user-select: none;
}
.title-heart { font-size: 0.55em; vertical-align: 0.12em; }

.score-boxes { display: flex; gap: 8px; }

.score-box {
  position: relative;
  min-width: calc(var(--board-size) * 0.21);
  padding: 6px 12px;
  background: var(--board-bg);
  border-radius: 10px;
  text-align: center;
  color: #fff;
  box-shadow: 0 2px 6px rgba(217, 79, 140, 0.25);
}
.score-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.85;
}
.score-value {
  display: block;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

/* 得分飘字 */
.score-fx-layer { position: absolute; inset: 0; overflow: visible; pointer-events: none; }
.score-gain {
  position: absolute;
  left: 0; right: 0;
  top: 4px;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  text-shadow: 0 1px 4px rgba(180, 40, 110, 0.55);
  animation: gain-float 0.7s ease-out forwards;
}
@keyframes gain-float {
  from { transform: translateY(6px); opacity: 1; }
  to   { transform: translateY(-26px); opacity: 0; }
}

/* ---------- 控制行 ---------- */
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 14px 0;
}
.intro { margin: 0; font-size: 14px; color: var(--text-soft); }
.intro strong { color: var(--accent-deep); }

.btn {
  border: none;
  cursor: pointer;
  padding: 9px 18px;
  border-radius: 10px;
  background: var(--btn-bg);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  box-shadow: 0 3px 8px rgba(217, 79, 140, 0.35);
  transition: background 0.15s, transform 0.1s;
}
.btn:hover { background: var(--btn-hover); }
.btn:active { transform: scale(0.96); }
.btn.ghost {
  background: rgba(255, 255, 255, 0.75);
  color: var(--accent-deep);
  box-shadow: 0 2px 6px rgba(217, 79, 140, 0.2);
}
.btn.ghost:hover { background: #fff; }

/* ---------- 棋盘 ---------- */
.board {
  position: relative;
  width: var(--board-size);
  height: var(--board-size);
  padding: var(--gap);
  background: var(--board-bg);
  border-radius: 12px;
  box-shadow: 0 6px 22px rgba(217, 79, 140, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.25);
  touch-action: none;
  user-select: none;
}
.board.shake { animation: shake 0.25s ease; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.cell-layer {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--gap);
  width: 100%;
  height: 100%;
}
.cell {
  background: var(--cell-bg);
  border-radius: 8px;
  box-shadow: inset 0 1px 3px rgba(217, 79, 140, 0.12);
}

/* ---------- 方块 ---------- */
.tile-layer { position: absolute; inset: var(--gap); }

.tile {
  position: absolute;
  top: 0; left: 0;
  width: var(--cell-size);
  height: var(--cell-size);
  transform: translate(calc(var(--c, 0) * var(--step)), calc(var(--r, 0) * var(--step)));
  transition: transform 0.13s ease-in-out;
  will-change: transform;
}
/* 位置（r/c 由 JS 通过 data 属性写入） */
[data-r="0"] { --r: 0; } [data-r="1"] { --r: 1; } [data-r="2"] { --r: 2; } [data-r="3"] { --r: 3; }
[data-c="0"] { --c: 0; } [data-c="1"] { --c: 1; } [data-c="2"] { --c: 2; } [data-c="3"] { --c: 3; }

.tile-inner {
  width: 100%;
  height: 100%;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: calc(var(--cell-size) * 0.44);
  box-shadow: 0 2px 5px rgba(190, 60, 120, 0.18);
  transition: font-size 0.1s;
}
.tile.small .tile-inner { font-size: calc(var(--cell-size) * 0.35); }
.tile.tiny .tile-inner  { font-size: calc(var(--cell-size) * 0.28); }

.tile-new .tile-inner {
  animation: appear 0.2s ease 0.08s backwards;
}
@keyframes appear {
  from { transform: scale(0); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.tile-merged { z-index: 20; }
.tile-merged .tile-inner {
  /* 不用 backwards：滑动期间就满尺寸显示新数字，接触瞬间轻弹一下 */
  animation: pop 0.18s ease 0.13s;
  box-shadow: 0 2px 8px rgba(190, 60, 120, 0.3);
}
@keyframes pop {
  0%   { transform: scale(1); }
  60%  { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* ---------- 粉色数值色板 ---------- */
.tile-2    .tile-inner { background: #fff7fa; color: #b26a8b; }
.tile-4    .tile-inner { background: #ffe9f2; color: #a9547c; }
.tile-8    .tile-inner { background: #ffc9e0; color: #fff; text-shadow: 0 1px 2px rgba(190, 60, 120, 0.25); }
.tile-16   .tile-inner { background: #ffabce; color: #fff; text-shadow: 0 1px 2px rgba(190, 60, 120, 0.25); }
.tile-32   .tile-inner { background: #ff8bbd; color: #fff; text-shadow: 0 1px 2px rgba(190, 60, 120, 0.3); }
.tile-64   .tile-inner { background: #ff6aa9; color: #fff; text-shadow: 0 1px 2px rgba(190, 60, 120, 0.3); }
.tile-128  .tile-inner { background: #f94d97; color: #fff; box-shadow: 0 0 14px rgba(249, 77, 151, 0.55); }
.tile-256  .tile-inner { background: #ee3385; color: #fff; box-shadow: 0 0 16px rgba(238, 51, 133, 0.6); }
.tile-512  .tile-inner { background: #dc2180; color: #fff; box-shadow: 0 0 18px rgba(220, 33, 128, 0.65); }
.tile-1024 .tile-inner { background: #c21874; color: #fff; box-shadow: 0 0 20px rgba(194, 24, 116, 0.7); }
.tile-2048 .tile-inner {
  background: linear-gradient(135deg, #a80f66 0%, #d4217f 100%);
  color: #fff;
  box-shadow: 0 0 26px rgba(212, 33, 127, 0.8);
}
.tile-super .tile-inner {
  background: linear-gradient(135deg, #6d0a45 0%, #a80f66 100%);
  color: #fff;
  box-shadow: 0 0 26px rgba(168, 15, 102, 0.75);
}

/* ---------- 遮罩层 ---------- */
.board-overlay {
  position: absolute;
  inset: 0;
  z-index: 30;
  border-radius: 12px;
  background: rgba(255, 214, 231, 0.88);
  backdrop-filter: blur(3px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s, visibility 0.3s;
}
.board-overlay.show { opacity: 1; visibility: visible; pointer-events: auto; }

.overlay-title {
  margin: 0;
  font-size: calc(var(--board-size) * 0.088);
  font-weight: 900;
  color: var(--accent-deep);
}
.overlay-text { margin: 0 0 10px; font-size: 15px; color: var(--text-soft); }
.overlay-buttons { display: flex; gap: 10px; }

/* ---------- 底部说明 ---------- */
.howto {
  margin: 16px 2px 0;
  font-size: 13px;
  color: var(--text-soft);
  text-align: center;
  line-height: 2;
}
kbd {
  display: inline-block;
  min-width: 20px;
  padding: 1px 5px;
  margin: 0 1px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 1px 2px rgba(217, 79, 140, 0.3);
  font-family: inherit;
  font-size: 12px;
  color: var(--accent-deep);
  text-align: center;
}

/* ---------- 小屏适配 ---------- */
@media (max-width: 400px) {
  .game { padding-top: 12px; }
  .intro { font-size: 13px; }
  .btn { padding: 8px 14px; font-size: 14px; }
  .score-value { font-size: 17px; }
  .howto { line-height: 1.9; }
}