:root {
  --background: #f3efe6;
  --board-background: #d8d1c4;
  --cell-background: #f7f4ed;
  --food: #c65a3c;
  --panel-background: #fffdf8;
  --panel-border: #c7bcac;
  --snake: #2a2726;
  --snake-body-fill: var(--snake);
  --snake-head: #171413;
  --snake-head-fill: var(--snake-head);
  --text: #231f19;
  --muted: #6c6458;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--background);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
}

button {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

.game-panel {
  position: relative;
  width: min(100%, 40rem);
  background: var(--panel-background);
  border: 1px solid var(--panel-border);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 1rem 2.5rem rgba(35, 31, 25, 0.08);
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0.35rem 0 0;
  font-size: clamp(2rem, 5vw, 3rem);
}

.intro,
.help-text,
.status-message {
  margin: 0.75rem 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.economy-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-top: 1.25rem;
}

.coin-block {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.shop-button {
  border: 1px solid var(--panel-border);
  background: #f6f1e7;
  color: var(--text);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

.shop-panel {
  margin-top: 0.9rem;
  padding: 1rem;
  background: #fbf7ef;
  border: 1px solid var(--panel-border);
  border-radius: 0.85rem;
}

.shop-panel[hidden] {
  display: none;
}

.challenge-modal {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(243, 239, 230, 0.84);
  border-radius: 1rem;
  z-index: 12;
}

.challenge-modal[hidden] {
  display: none;
}

.challenge-card {
  width: min(100%, 23rem);
  padding: 1rem;
  background: var(--panel-background);
  border: 1px solid var(--panel-border);
  border-radius: 1rem;
  box-shadow: 0 1rem 2rem rgba(35, 31, 25, 0.12);
}

.challenge-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.challenge-title {
  margin: 0.35rem 0 0;
  font-size: 1.4rem;
}

.challenge-prompt {
  margin: 1rem 0 0;
  font-size: 1.65rem;
  font-weight: 700;
}

.challenge-reward,
.challenge-feedback {
  margin: 0.55rem 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.challenge-form {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.challenge-input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--panel-border);
  background: #fffdf8;
  color: var(--text);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  font: inherit;
}

.challenge-submit {
  border: 1px solid var(--panel-border);
  background: #f6f1e7;
  color: var(--text);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

.shop-title,
.shop-item-title {
  margin: 0;
  font-weight: 700;
}

.shop-copy,
.shop-feedback,
.shop-item-copy {
  margin: 0.3rem 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.shop-items {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.85rem;
}

.shop-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.9rem;
  background: var(--panel-background);
  border: 1px solid var(--panel-border);
  border-radius: 0.8rem;
}

.shop-price {
  display: inline-block;
  margin-top: 0.45rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.shop-item-button {
  border: 1px solid var(--panel-border);
  background: #f6f1e7;
  color: var(--text);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

.shop-item-button:disabled,
.shop-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.hearts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 1.25rem;
}

.heart {
  color: #d35b52;
  font-size: 1.8rem;
  line-height: 1;
  text-shadow: 2px 2px 0 #7e2a2a;
}

.heart.is-empty {
  color: #d7cec0;
  text-shadow: none;
  opacity: 0.8;
}

.status-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-top: 1.5rem;
}

.score-block {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

#coins,
#score {
  font-size: 1.8rem;
}

.action-row {
  display: flex;
  gap: 0.75rem;
}

.action-row button,
.shop-item-button,
.shop-button,
.touch-button {
  border: 1px solid var(--panel-border);
  background: #f6f1e7;
  color: var(--text);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

.action-row button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.board {
  --board-cols: 16;
  --board-rows: 16;
  margin-top: 1.25rem;
  width: min(100%, 32rem);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(var(--board-cols), 1fr);
  grid-template-rows: repeat(var(--board-rows), 1fr);
  gap: 2px;
  padding: 2px;
  background: var(--board-background);
  border-radius: 0.75rem;
}

.board-cell {
  background: var(--cell-background);
  border-radius: 0.18rem;
  overflow: visible;
  position: relative;
}

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

.board-cell.snake-head {
  background:
    radial-gradient(circle at 34% 37%, #ffffff 0 11%, transparent 12%),
    radial-gradient(circle at 66% 37%, #ffffff 0 11%, transparent 12%),
    radial-gradient(circle at 34% 39%, #121110 0 5%, transparent 6%),
    radial-gradient(circle at 66% 39%, #121110 0 5%, transparent 6%),
    radial-gradient(circle at 79% 58%, #3b3433 0 6%, transparent 7%),
    var(--snake-head-fill);
  border-radius: 50%;
  box-shadow: inset -1px -1px 0 rgba(255, 255, 255, 0.05);
  transform: scale(0.94);
  z-index: 1;
}

.board-cell.snake-head::before {
  content: "";
  position: absolute;
  right: -18%;
  top: 45%;
  width: 34%;
  height: 12%;
  background: #d84b43;
  border-radius: 999px;
}

.board-cell.snake-head.heading-up {
  transform: rotate(-90deg) scale(0.94);
}

.board-cell.snake-head.heading-right {
  transform: rotate(0deg) scale(0.94);
}

.board-cell.snake-head.heading-down {
  transform: rotate(90deg) scale(0.94);
}

.board-cell.snake-head.heading-left {
  transform: rotate(180deg) scale(0.94);
}

.board-cell.food {
  background:
    radial-gradient(circle at 34% 28%, #cfd4d7 0 16%, transparent 17%),
    radial-gradient(circle at 34% 30%, #f2bac3 0 7%, transparent 8%),
    radial-gradient(circle at 58% 32%, #cfd4d7 0 14%, transparent 15%),
    radial-gradient(circle at 58% 34%, #f2bac3 0 6%, transparent 7%),
    radial-gradient(circle at 70% 52%, #191614 0 4%, transparent 5%),
    radial-gradient(circle at 82% 58%, #efb1ba 0 5%, transparent 6%),
    radial-gradient(circle at 52% 58%, #aeb4b8 0 40%, transparent 41%);
  border-radius: 58% 62% 58% 54%;
  box-shadow: inset -1px -1px 0 rgba(0, 0, 0, 0.08);
  transform: scale(0.82) translateX(4%);
  z-index: 1;
}

.board-cell.food::before {
  content: "";
  position: absolute;
  left: -48%;
  top: 48%;
  width: 74%;
  height: 42%;
  border: 2px solid #e7a9b4;
  border-color: #e7a9b4 transparent transparent transparent;
  border-radius: 90% 90% 0 0;
  transform: rotate(-16deg);
}

.board-cell.chest {
  background:
    linear-gradient(180deg, transparent 36%, #4c2c13 36% 48%, transparent 48%),
    linear-gradient(90deg, transparent 38%, #4c2c13 38% 62%, transparent 62%),
    linear-gradient(180deg, #d59b4a 0 36%, #8d5126 36% 100%);
  border-radius: 0.2rem;
  box-shadow: inset -1px -1px 0 rgba(0, 0, 0, 0.12);
  transform: scale(0.76);
  z-index: 1;
}

.board-cell.chest::before {
  content: "";
  position: absolute;
  left: 38%;
  top: 42%;
  width: 24%;
  height: 22%;
  background: #f1cb63;
  border-radius: 0.14rem;
  box-shadow: inset -1px -1px 0 rgba(0, 0, 0, 0.18);
}

.game-panel[data-skin="ember"] {
  --snake-body-fill: repeating-linear-gradient(
    135deg,
    #211312 0 26%,
    #ba6a2b 26% 52%,
    #211312 52% 78%,
    #8f4324 78% 100%
  );
  --snake-head-fill: linear-gradient(135deg, #20110f 0 40%, #c57a33 40% 58%, #261412 58% 100%);
}

.touch-controls {
  margin-top: 1.5rem;
  display: none;
  grid-template-columns: repeat(3, minmax(0, 4.25rem));
  grid-template-areas:
    ". up ."
    "left . right"
    ". down .";
  justify-content: center;
  gap: 0.6rem;
}

.touch-up {
  grid-area: up;
}

.touch-left {
  grid-area: left;
}

.touch-right {
  grid-area: right;
}

.touch-down {
  grid-area: down;
}

@media (max-width: 700px) {
  .game-panel {
    padding: 1.25rem;
  }

  .hearts {
    margin-top: 1rem;
  }

  .economy-bar,
  .shop-item,
  .status-bar {
    grid-template-columns: 1fr;
  }

  .status-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .economy-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .challenge-form {
    flex-direction: column;
  }

  .shop-item {
    grid-template-columns: 1fr;
  }

  .board {
    width: 100%;
  }

  .touch-controls {
    display: grid;
  }
}