/* Memory Match — 2D 像素记忆花园皮肤。
 *
 * 几何来自 /assets/css/tokens.css 的 --pixel-* 令牌；Shell 的 pixel.css
 * 不进入 iframe。这里只定义游戏本地 --mm-* 颜色与像素组件：
 * 硬边框、0 圆角、硬偏移阴影；无渐变、模糊、发光、玻璃半透明。
 * 卡片符号是 game/js/glyphs.js 中的 8×8 像素点阵，卡片背面复用生成的
 * pixel/ 精灵图集。
 */

:root {
  color-scheme: light;

  --mm-border: var(--pixel-border-width);
  --mm-border-thin: var(--pixel-border-thin);
  --mm-shadow: var(--pixel-shadow-offset);
  --mm-shadow-lg: var(--pixel-shadow-offset-lg);
  --mm-font: var(--pixel-ui-font);
  --mm-gap: 4px;

  --mm-bg: #efe9dc;
  --mm-bg-2: #ddd4c2;
  --mm-surface: #fffdf6;
  --mm-surface-2: #f3eddf;
  --mm-surface-3: #e8dfcc;
  --mm-ink: #2b2a33;
  --mm-muted: #6b6774;
  --mm-line: #2b2a33;
  --mm-brand: #6c5ce7;
  --mm-brand-strong: #4e3fc7;
  --mm-brand-soft: #ddd8ff;
  --mm-on-brand: #ffffff;
  --mm-accent: #f0b429;
  --mm-accent-strong: #a86f00;
  --mm-accent-soft: #ffe9a8;
  --mm-on-accent: #3d2a00;
  --mm-success: #3f9d6b;
  --mm-success-soft: #d8f0e2;
  --mm-danger: #d9534f;
  --mm-danger-strong: #a8342f;
  --mm-danger-soft: #ffe0dd;
  --mm-on-danger: #ffffff;
  --mm-scrim: rgba(24, 20, 36, 0.64);
  --mm-shadow-color: #2b2a33;
}

[data-theme="dark"] {
  color-scheme: dark;

  --mm-bg: #12111c;
  --mm-bg-2: #1c1a2b;
  --mm-surface: #221f33;
  --mm-surface-2: #2b2742;
  --mm-surface-3: #342f4d;
  --mm-ink: #f4f1ff;
  --mm-muted: #a9a3c0;
  --mm-line: #f4f1ff;
  --mm-brand: #9b8cff;
  --mm-brand-strong: #b8adff;
  --mm-brand-soft: #342b63;
  --mm-on-brand: #141226;
  --mm-accent: #ffd166;
  --mm-accent-strong: #ffd166;
  --mm-accent-soft: #4a3a14;
  --mm-on-accent: #2a1e00;
  --mm-success: #5fd39a;
  --mm-success-soft: #1d3d2e;
  --mm-danger: #ff7a6b;
  --mm-danger-strong: #ff9a8f;
  --mm-danger-soft: #4a201a;
  --mm-on-danger: #2a0d08;
  --mm-scrim: rgba(5, 3, 12, 0.78);
  --mm-shadow-color: #05030c;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--mm-bg);
}

body {
  color: var(--mm-ink);
  font-family: var(--mm-font);
  font-size: 16px;
  line-height: 1.35;
  -webkit-font-smoothing: none;
  text-rendering: optimizeSpeed;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

button {
  color: inherit;
  font: inherit;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
}

button:focus-visible {
  outline: var(--mm-border) solid var(--color-focus);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.mm-app {
  position: fixed;
  inset: 0;
  display: flex;
  min-height: 0;
  flex-direction: column;
  gap: var(--mm-gap);
  padding:
    max(4px, env(safe-area-inset-top))
    max(4px, min(env(safe-area-inset-right, 0px), 6px))
    max(6px, min(env(safe-area-inset-bottom, 0px), 10px))
    max(4px, min(env(safe-area-inset-left, 0px), 6px));
  overflow: hidden;
  background: transparent;
}

.mm-app.is-paused .mm-main {
  opacity: 0.58;
}

/* Background scene -------------------------------------------------------- */

.mm-scene {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background-color: var(--mm-bg);
  background-image: url("./assets/memory-match-scene-light.png");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  image-rendering: pixelated;
  pointer-events: none;
}

[data-theme="dark"] .mm-scene {
  background-image: url("./assets/memory-match-scene-dark.png");
}

.mm-header,
.mm-main {
  position: relative;
  z-index: 1;
}

/* Header ------------------------------------------------------------------ */

.mm-header {
  display: flex;
  min-width: 0;
  flex: 0 0 auto;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border: var(--mm-border) solid var(--mm-line);
  background: var(--mm-surface);
  box-shadow: var(--mm-shadow) var(--mm-shadow) 0 var(--mm-shadow-color);
}

.mm-brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 6px;
}

.mm-brand__mark {
  display: block;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border: var(--mm-border-thin) solid var(--mm-line);
  background-color: var(--mm-brand);
  background-image: url("./assets/pixel/memory-match-sprites.png");
  background-repeat: no-repeat;
  background-size: 128px 64px;
  background-position: 0 100%;
  image-rendering: pixelated;
}

.mm-brand__copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.05;
}

.mm-brand__copy h1 {
  margin: 0;
  overflow: hidden;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.mm-brand__copy p {
  margin: 2px 0 0;
  overflow: hidden;
  color: var(--mm-muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.mm-header__hint {
  display: none;
  margin: 0 0 0 auto;
  color: var(--mm-muted);
  font-size: 10px;
  white-space: nowrap;
}

/* Main layout ------------------------------------------------------------- */

.mm-main {
  display: flex;
  min-width: 0;
  min-height: 0;
  flex: 1 1 auto;
  flex-direction: column;
  gap: var(--mm-gap);
}

.mm-stats {
  display: grid;
  min-width: 0;
  flex: 0 0 auto;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--mm-gap);
}

.mm-stat {
  display: flex;
  min-width: 0;
  min-height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2px 2px;
  border: var(--mm-border-thin) solid var(--mm-line);
  background: var(--mm-surface);
  box-shadow: 2px 2px 0 var(--mm-shadow-color);
  line-height: 1.05;
}

.mm-stat span {
  overflow: hidden;
  width: 100%;
  color: var(--mm-muted);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-align: center;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.mm-stat strong {
  overflow: hidden;
  width: 100%;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mm-stat--score {
  border-color: var(--mm-brand-strong);
  background: var(--mm-brand-soft);
  color: var(--mm-ink);
}

.mm-stat strong.is-pop {
  animation: mm-score-pop 280ms steps(2, end);
}

/* Board ------------------------------------------------------------------- */

.mm-board-col {
  display: grid;
  min-width: 0;
  min-height: 0;
  flex: 1 1 auto;
  place-items: center;
  overflow: hidden;
}

.mm-board-viewport {
  display: grid;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  place-items: center;
  overflow: hidden;
}

.mm-board {
  display: grid;
  grid-template-columns: repeat(var(--mm-cols, 4), minmax(0, 1fr));
  grid-template-rows: repeat(var(--mm-rows, 4), minmax(0, 1fr));
  gap: 8px;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.mm-board.is-cleared {
  outline: var(--mm-border-thin) solid var(--mm-success);
  outline-offset: 3px;
}

.mm-card {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 80ms steps(2, end);
}

.mm-card:active {
  transform: translate(1px, 1px);
}

.mm-card__inner {
  position: absolute;
  inset: 0;
  display: block;
  transform-style: preserve-3d;
  transition: transform 180ms steps(4, end);
}

.mm-card.is-up .mm-card__inner,
.mm-card.is-matched .mm-card__inner {
  transform: rotateY(180deg);
}

.mm-card__face {
  position: absolute;
  inset: 0;
  display: grid;
  overflow: hidden;
  place-items: center;
  border: var(--mm-border-thin) solid var(--mm-line);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: 2px 2px 0 var(--mm-shadow-color);
}

.mm-card__face--back {
  background: var(--mm-brand);
}

.mm-card__pattern {
  display: block;
  width: var(--mm-emblem-size, 32px);
  height: var(--mm-emblem-size, 32px);
  background-image: url("./assets/pixel/memory-match-sprites.png");
  background-repeat: no-repeat;
  background-size:
    calc(var(--mm-emblem-size, 32px) * 4)
    calc(var(--mm-emblem-size, 32px) * 2);
  background-position: 0 100%;
  image-rendering: pixelated;
}

.mm-card__face--front {
  background: var(--mm-surface);
  transform: rotateY(180deg);
}

.mm-card__glyph {
  display: block;
  width: var(--mm-glyph-size, 48px);
  height: var(--mm-glyph-size, 48px);
  background-image: url("./assets/pixel/memory-match-cards.png");
  background-repeat: no-repeat;
  background-size: 500% 300%;
  background-position: 0 0;
  image-rendering: pixelated;
}

.mm-card__glyph[data-symbol="lemon"] { background-position: 25% 0; }
.mm-card__glyph[data-symbol="grapes"] { background-position: 50% 0; }
.mm-card__glyph[data-symbol="strawberry"] { background-position: 75% 0; }
.mm-card__glyph[data-symbol="kiwi"] { background-position: 100% 0; }
.mm-card__glyph[data-symbol="cherries"] { background-position: 0 50%; }
.mm-card__glyph[data-symbol="peach"] { background-position: 25% 50%; }
.mm-card__glyph[data-symbol="orange"] { background-position: 50% 50%; }
.mm-card__glyph[data-symbol="avocado"] { background-position: 75% 50%; }
.mm-card__glyph[data-symbol="blossom"] { background-position: 100% 50%; }
.mm-card__glyph[data-symbol="sunflower"] { background-position: 0 100%; }
.mm-card__glyph[data-symbol="rainbow"] { background-position: 25% 100%; }
.mm-card__glyph[data-symbol="star"] { background-position: 50% 100%; }
.mm-card__glyph[data-symbol="moon"] { background-position: 75% 100%; }
.mm-card__glyph[data-symbol="flame"] { background-position: 100% 100%; }

.mm-card.is-matched .mm-card__face--front {
  border-color: var(--mm-success);
  background: var(--mm-success-soft);
  box-shadow: inset 0 0 0 2px var(--mm-success);
}

.mm-card.is-match-pulse .mm-card__face--front {
  animation: mm-match-pop 380ms steps(3, end);
}

.mm-card.is-wrong {
  animation: mm-wrong-shake 170ms steps(2, end);
}

.mm-card.is-invalid {
  animation: mm-wrong-shake 170ms steps(2, end);
}

.mm-card.is-invalid .mm-card__face {
  border-color: var(--mm-danger);
  box-shadow: 2px 2px 0 var(--mm-danger-strong);
}

.mm-card.is-wrong .mm-card__face--front {
  border-color: var(--mm-danger);
  box-shadow: 2px 2px 0 var(--mm-danger-strong);
}

.mm-board.is-mismatch {
  outline: var(--mm-border-thin) solid var(--mm-danger);
  outline-offset: 2px;
}

@media (hover: hover) {
  .mm-card:not(.is-up):not(.is-matched):hover .mm-card__inner {
    transform: translateY(-2px);
  }
}

/* Difficulty and hint ----------------------------------------------------- */

.mm-side {
  display: flex;
  min-width: 0;
  flex: 0 0 auto;
  flex-direction: column;
  gap: var(--mm-gap);
}

.mm-difficulty {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--mm-gap);
}

.mm-diff {
  display: flex;
  min-width: 0;
  min-height: 48px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 3px 4px;
  border: var(--mm-border-thin) solid var(--mm-line);
  background: var(--mm-surface);
  box-shadow: 2px 2px 0 var(--mm-shadow-color);
  color: var(--mm-ink);
  text-align: center;
  transition:
    transform 80ms steps(2, end),
    background-color 80ms steps(2, end);
}

.mm-diff:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.mm-diff.is-active {
  border-color: var(--mm-brand-strong);
  background: var(--mm-brand);
  color: var(--mm-on-brand);
  box-shadow: inset 0 0 0 2px var(--mm-accent), 2px 2px 0 var(--mm-shadow-color);
}

.mm-diff:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.mm-diff__size {
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.mm-diff__meta {
  overflow: hidden;
  max-width: 100%;
  color: var(--mm-muted);
  font-size: 9px;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mm-diff.is-active .mm-diff__meta {
  color: var(--mm-on-brand);
}

.mm-hint {
  margin: 0;
  color: var(--mm-muted);
  font-size: 10px;
  line-height: 1.35;
  text-align: center;
}

.mm-hint__keys {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 3px;
  margin-top: 4px;
}

.mm-hint kbd {
  display: inline-block;
  min-width: 20px;
  padding: 1px 4px;
  border: var(--mm-border-thin) solid var(--mm-line);
  background: var(--mm-surface);
  color: var(--mm-muted);
  font-family: var(--mm-font);
  font-size: 9px;
  line-height: 1.3;
  text-align: center;
}

/* Overlays ---------------------------------------------------------------- */

.mm-overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 8px;
  background: var(--mm-scrim);
}

.mm-dialog {
  width: min(calc(100% - 8px), 360px);
  max-height: 80dvh;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px;
  border: var(--mm-border) solid var(--mm-line);
  background: var(--mm-surface);
  color: var(--mm-ink);
  box-shadow: var(--mm-shadow-lg) var(--mm-shadow-lg) 0 var(--mm-shadow-color);
  text-align: center;
}

.mm-eyebrow {
  margin: 0 0 4px;
  color: var(--mm-brand-strong);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mm-dialog__title {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.15;
  text-transform: uppercase;
}

.mm-dialog__text {
  margin: 0 0 14px;
  color: var(--mm-muted);
  font-size: 14px;
  line-height: 1.45;
}

.mm-result {
  display: grid;
  margin: 0 0 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
}

.mm-result > div {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 2px;
  padding: 6px 3px;
  border: var(--mm-border-thin) solid var(--mm-line);
  background: var(--mm-surface-2);
}

.mm-result > div.mm-result__score {
  border-color: var(--mm-brand-strong);
  background: var(--mm-brand-soft);
}

.mm-result dt {
  color: var(--mm-muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.mm-result dd {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.mm-result__score dd {
  color: var(--mm-brand-strong);
  font-size: 20px;
}

.mm-result__best {
  margin: 0 0 8px;
  color: var(--mm-muted);
  font-size: 12px;
}

.mm-result__best strong {
  color: var(--mm-ink);
  font-variant-numeric: tabular-nums;
}

.mm-record {
  margin: 0 0 14px;
  padding: 3px 8px;
  border: var(--mm-border-thin) solid var(--mm-line);
  background: var(--mm-surface-2);
  color: var(--mm-muted);
  font-size: 12px;
  font-weight: 700;
}

.mm-record.is-record {
  border-color: var(--mm-success);
  background: var(--mm-success-soft);
  color: var(--mm-ink);
}

.mm-dialog__actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mm-btn {
  width: 100%;
  min-height: 48px;
  padding: 6px 14px;
  border: var(--mm-border) solid var(--mm-line);
  background: var(--mm-surface);
  color: var(--mm-ink);
  box-shadow: 3px 3px 0 var(--mm-shadow-color);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
  transition:
    transform 80ms steps(2, end),
    box-shadow 80ms steps(2, end);
}

.mm-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--mm-shadow-color);
}

.mm-btn--primary {
  background: var(--mm-brand);
  color: var(--mm-on-brand);
}

.mm-btn--ghost {
  background: var(--mm-surface-2);
}

.mm-btn--ghost:hover {
  background: var(--mm-surface-3);
}

/* Compact / landscape layouts --------------------------------------------- */

.mm-app[data-density="compact"] {
  gap: 4px;
  padding:
    max(3px, env(safe-area-inset-top))
    max(3px, min(env(safe-area-inset-right, 0px), 6px))
    max(4px, min(env(safe-area-inset-bottom, 0px), 8px))
    max(3px, min(env(safe-area-inset-left, 0px), 6px));
}

.mm-app[data-density="compact"] .mm-header {
  display: none;
}

.mm-app[data-density="compact"] .mm-hint {
  display: none;
}

.mm-app[data-density="compact"] .mm-main,
.mm-app[data-density="compact"] .mm-side {
  gap: 4px;
}

.mm-app[data-density="compact"] .mm-stats {
  gap: 4px;
}

.mm-app[data-density="compact"] .mm-stat {
  min-height: 32px;
  padding: 1px 2px;
}

.mm-app[data-density="compact"] .mm-stat span {
  font-size: 8px;
  line-height: 1.05;
}

.mm-app[data-density="compact"] .mm-stat strong {
  font-size: 12px;
  line-height: 1.05;
}

.mm-app[data-density="compact"] .mm-diff {
  min-height: 44px;
  padding: 2px 4px;
}

.mm-app[data-density="compact"] .mm-diff__meta {
  display: none;
}

.mm-app[data-layout="landscape"] .mm-main {
  display: grid;
  grid-template-areas:
    "board stats"
    "board side";
  grid-template-columns: minmax(0, 1fr) minmax(148px, 32%);
  grid-template-rows: auto minmax(0, 1fr);
  gap: 4px;
}

.mm-app[data-layout="landscape"] .mm-board-col {
  grid-area: board;
}

.mm-app[data-layout="landscape"] .mm-stats {
  grid-area: stats;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.mm-app[data-layout="landscape"] .mm-side {
  min-height: 0;
  grid-area: side;
}

.mm-app[data-layout="landscape"] .mm-difficulty {
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
}

.mm-app[data-layout="landscape"] .mm-diff {
  flex-direction: row;
  gap: 6px;
  min-height: 44px;
  padding: 3px 6px;
}

.mm-app[data-layout="landscape"] .mm-hint {
  margin-top: auto;
}

/* Screen-reader helper ---------------------------------------------------- */

.mm-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Animations -------------------------------------------------------------- */

@keyframes mm-score-pop {
  0% { transform: scale(1); }
  45% { transform: scale(1.14); }
  100% { transform: scale(1); }
}

@keyframes mm-match-pop {
  0% { transform: rotateY(180deg) scale(1); }
  50% { transform: rotateY(180deg) scale(1.06); }
  100% { transform: rotateY(180deg) scale(1); }
}

@keyframes mm-wrong-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* Reduced motion ---------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }

  .mm-card__inner {
    transition: none;
  }

  .mm-card:not(.is-up):not(.is-matched):hover .mm-card__inner {
    transform: none;
  }
}

@media (min-width: 768px) {
  .mm-header__hint {
    display: block;
  }
}