:root {
  --bg: #fff8ee;
  --surface: #ffffff;
  --border: #e4d9cc;
  --text: #2b2a34;
  --muted: #6d6678;
  --snake: #3c8a53;
  --food: #e05d4d;
  --cell: #f4efe6;
  --cat-icon: url('assets/cat-snake-ginger.svg');
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: radial-gradient(circle at 20% 0%, #fffdf8 0%, var(--bg) 55%, #fef1de 100%);
  color: var(--text);
}

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 16px;
}

.hidden {
  display: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}

.title-wrap {
  min-width: 0;
}

.title {
  margin: 0;
  font-size: 1.42rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.intro {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.title-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

.game-screen {
  margin-top: 10px;
}

.hud {
  display: flex;
  gap: 14px;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.actions {
  margin: 12px 0;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.action-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
}

button,
select {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font: inherit;
}

button {
  cursor: pointer;
}

button:hover {
  background: #fff8ef;
}

.board-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  box-shadow: 0 4px 14px rgba(80, 62, 31, 0.06);
}

.board {
  --rows: 20;
  --cols: 20;
  display: grid;
  width: min(80vmin, 520px);
  height: min(80vmin, 520px);
  margin: 0 auto;
  grid-template-columns: repeat(var(--cols), 1fr);
  grid-template-rows: repeat(var(--rows), 1fr);
  gap: 1px;
  background: var(--border);
  touch-action: none;
}

.cell {
  background: var(--cell);
}

.cell.snake {
  background: var(--snake);
}

.cell.head {
  background-color: #ffd9a3;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 92%;
}

.board[data-cat-skin='ginger'] .cell.head,
.board:not([data-cat-skin]) .cell.head {
  background-image: url('assets/cat-snake-ginger.svg');
}

.board[data-cat-skin='gray'] .cell.head {
  background-image: url('assets/cat-snake-gray.svg');
}

.board[data-cat-skin='tuxedo'] .cell.head {
  background-image: url('assets/cat-snake-tuxedo.svg');
}

.cell.food {
  background: var(--food);
}

.mobile-controls {
  display: none;
  margin-top: 12px;
  width: 196px;
  margin-left: auto;
  margin-right: auto;
  grid-template-columns: repeat(3, 60px);
  grid-template-rows: repeat(2, 44px);
  gap: 8px;
  justify-items: center;
  align-items: center;
}

.mobile-controls .up {
  grid-column: 2;
  grid-row: 1;
}

.mobile-controls .left {
  grid-column: 1;
  grid-row: 2;
}

.mobile-controls .right {
  grid-column: 3;
  grid-row: 2;
}

.mobile-controls .down {
  grid-column: 2;
  grid-row: 2;
}

.ctrl {
  width: 60px;
  height: 44px;
  padding: 0;
}

.recent-wrap {
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}

.recent-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.recent-header h2 {
  margin: 0;
  font-size: 1rem;
}

.recent-list {
  margin: 8px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 0.92rem;
}

.recent-list li {
  padding: 2px 0;
}

#pairs-board-wrap {
  position: relative;
  overflow: hidden;
}

.pairs-board {
  --pairs-cols: 4;
  display: grid;
  grid-template-columns: repeat(var(--pairs-cols), minmax(0, 1fr));
  gap: 8px;
  width: min(80vmin, 520px);
  margin: 0 auto;
}

.pair-card {
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #e8ecf3;
  color: #2d3444;
  font-size: 1.55rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  text-transform: none;
  letter-spacing: 0;
  position: relative;
  transition: transform 140ms ease, box-shadow 160ms ease, background-color 180ms ease;
}

.pair-card:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(31, 39, 50, 0.12);
}

.pair-card:active:not(:disabled) {
  transform: scale(0.97);
}

.pair-card::before {
  content: '';
  position: absolute;
  inset: 12%;
  background-image: var(--cat-icon);
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  opacity: 0.12;
}

.pair-card.is-open,
.pair-card.is-matched {
  color: #1f2732;
}

.pair-card.is-open::before,
.pair-card.is-matched::before {
  opacity: 0;
}

.pair-card.is-open {
  background: #fff4db;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(255, 188, 94, 0.22);
}

.pair-card.is-matched {
  background: #d8f2df;
  animation: pair-pop 260ms ease-out;
}

.pairs-celebration {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.celebration-piece {
  position: absolute;
  top: -10%;
  left: calc(var(--x) * 1%);
  width: 9px;
  height: 14px;
  border-radius: 2px;
  background: hsl(var(--h), 85%, 62%);
  opacity: 0;
  animation: confetti-fall 1100ms ease-out forwards;
  animation-delay: calc(var(--d) * 1ms);
}

@keyframes pair-pop {
  0% {
    transform: scale(0.92);
  }
  60% {
    transform: scale(1.06);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes confetti-fall {
  0% {
    opacity: 0;
    transform: translate3d(0, -18px, 0) rotate(0deg);
  }
  10% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate3d(var(--drift), 480px, 0) rotate(380deg);
  }
}

#catch-board-wrap {
  position: relative;
  overflow: hidden;
}

.catch-celebration {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.catch-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  width: min(70vmin, 420px);
  margin: 0 auto;
}

.catch-hole {
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #edf1f7;
  position: relative;
  overflow: hidden;
}

.catch-hole.active {
  background-color: #ffe0b8;
  background-image: var(--cat-icon);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 70%;
}

.catch-hole.active.bonus {
  background-color: #ffe88f;
  box-shadow: 0 0 0 2px #ffca4d inset;
}

.help {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

#jumper-screen .mobile-controls,
#stack-screen .mobile-controls {
  width: auto;
  grid-template-columns: 1fr;
  grid-template-rows: auto;
}

.mobile-jumper-controls .ctrl,
.mobile-stack-controls .ctrl {
  width: min(220px, 100%);
}

.jumper-board {
  position: relative;
  width: min(82vmin, 560px);
  height: min(42vmin, 250px);
  min-height: 200px;
  margin: 0 auto;
  border: 1px dashed #e8dac8;
  border-radius: 12px;
  background: linear-gradient(180deg, #fff6ea 0%, #ffedd4 70%, #ffe1b5 100%);
  overflow: hidden;
}

.jumper-board::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 24%;
  background: repeating-linear-gradient(90deg, #edd6b4 0 24px, #f5dfc0 24px 48px);
}

.jumper-cat,
.jumper-obstacle {
  position: absolute;
  z-index: 1;
}

.jumper-cat {
  width: 52px;
  height: 52px;
  background-image: var(--cat-icon);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: drop-shadow(0 2px 1px rgba(0, 0, 0, 0.15));
}

.jumper-obstacle {
  width: 30px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(180deg, #fbe4ff 0%, #e5b8ff 100%);
  border: 1px solid #d39de6;
  box-shadow: inset 0 0 0 3px #f8d6ff;
}

.stack-board {
  position: relative;
  width: min(82vmin, 560px);
  height: min(52vmin, 320px);
  min-height: 250px;
  margin: 0 auto;
  border: 1px dashed #e8dac8;
  border-radius: 12px;
  background: linear-gradient(180deg, #fff7ec 0%, #ffe9ce 100%);
  overflow: hidden;
}

.stack-board::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 14px;
  background: #e2c59f;
}

.stack-tower {
  position: absolute;
  inset: 0;
}

.stack-layer,
#stack-moving {
  position: absolute;
  border-radius: 7px;
  border: 1px solid #d0a77b;
  background: linear-gradient(180deg, #ffd39e 0%, #f5b56d 100%);
  box-shadow: 0 2px 0 rgba(165, 108, 48, 0.2);
}

#stack-moving {
  background: linear-gradient(180deg, #ffc7da 0%, #f49dbc 100%);
  border-color: #d484a2;
}

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .mobile-controls {
    display: grid;
  }

  .intro {
    font-size: 0.88rem;
  }

  #jumper-screen .mobile-controls,
  #stack-screen .mobile-controls {
    justify-items: stretch;
  }
}