:root {
  color-scheme: light;
  font-family: "DM Sans", "Segoe UI", sans-serif;
  background: #f4f1e8;
  color: #1f2a1f;
  --panel: #fffaf0;
  --border: #2f4f2f;
  --cell: #e1dccf;
  --snake: #2f6b3f;
  --food: #c9472c;
  --accent: #405f3d;
  --board-bg: #d8d1c1;
  --body-bg-start: #f4f1e8;
  --body-bg-end: #e9e0cf;
  --overlay-bg: rgba(31, 42, 31, 0.58);
  --overlay-card: rgba(255, 250, 240, 0.96);
  --muted: #475145;
  --button-bg: #f6f0df;
  --button-hover: #ede4cd;
  --empty-heart: #c8bca9;
  --support-link: #8d3b35;
  --glow: rgba(47, 79, 47, 0.12);
}

body.dark {
  color-scheme: dark;
  background: #12071e;
  color: #f4ebff;
  --panel: rgba(20, 9, 33, 0.92);
  --border: #b84bff;
  --cell: #27153d;
  --snake: #f3dcff;
  --food: #ff4ad8;
  --accent: #efe4ff;
  --board-bg: #170b27;
  --body-bg-start: #09040f;
  --body-bg-end: #240b33;
  --overlay-bg: rgba(10, 4, 19, 0.78);
  --overlay-card: rgba(31, 12, 48, 0.94);
  --muted: #d8b5ff;
  --button-bg: rgba(54, 24, 86, 0.9);
  --button-hover: rgba(80, 31, 128, 0.95);
  --empty-heart: #65406d;
  --support-link: #ff86ef;
  --glow: rgba(185, 75, 255, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--body-bg-start) 0%, var(--body-bg-end) 100%);
}

.app {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 48px 24px;
}

.topbar {
  width: min(100%, 520px);
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 18px;
}

.state-summary {
  display: grid;
  gap: 2px;
}

.state-value {
  margin: 0;
  font-size: 2rem;
  line-height: 1.05;
  font-weight: 700;
}

.panel {
  position: relative;
  width: min(100%, 552px);
  padding: 24px 26px 26px;
  border: 2px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 12px 30px var(--glow);
}

.status-bar,
.help {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.status-bar {
  margin-bottom: 18px;
  align-items: start;
}

.score-block,
.lives-block {
  display: grid;
  gap: 4px;
}

.lives-block {
  text-align: right;
}

.label {
  margin: 0 0 4px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.value {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.hearts {
  display: flex;
  gap: 6px;
  align-items: center;
}

.heart {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.heart.is-hidden {
  display: none;
}

button {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--button-bg);
  color: inherit;
  font: inherit;
  padding: 12px 16px;
  cursor: pointer;
}

button:hover {
  background: var(--button-hover);
}

.board {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 5px;
  width: 100%;
  margin: 0 auto;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 18px;
  background: var(--board-bg);
  outline: none;
}

.board-wrap {
  position: relative;
}

.phan-popup {
  position: absolute;
  left: 50%;
  top: 12px;
  transform: translateX(-50%);
  width: 140px;
  height: 140px;
  padding: 8px;
  border: 2px solid var(--border);
  border-radius: 18px;
  background: var(--overlay-card);
  box-shadow: 0 18px 40px var(--glow);
  opacity: 0;
  pointer-events: none;
  z-index: 3;
}

.phan-popup img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
}

.phan-popup.is-visible {
  animation: phan-pop 1s ease-in-out forwards;
}

.overlay {
  position: absolute;
  inset: 10px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--overlay-bg);
  z-index: 1;
}

.overlay.is-hidden {
  display: none;
}

.overlay-card {
  max-width: 280px;
  padding: 20px;
  border-radius: 16px;
  background: var(--overlay-card);
  text-align: center;
}

.overlay-title {
  margin: 0 0 8px;
  font-size: 1.35rem;
  font-weight: 700;
}

.overlay-copy {
  margin: 0 0 16px;
  color: var(--muted);
}

.cell {
  aspect-ratio: 1;
  border-radius: 5px;
  background: var(--cell);
}

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

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

.cell.food.phan {
  background-color: #f7efe3;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.help {
  margin: 16px 0 18px;
  font-size: 0.98rem;
  color: var(--muted);
  flex-direction: column;
  gap: 6px;
  text-align: center;
  align-items: center;
}

.help p {
  margin: 0;
}

.controls {
  display: grid;
  gap: 10px;
  justify-items: center;
}

.controls-area {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 22px;
}

.controls-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(70px, 1fr));
  gap: 10px;
}

.actions {
  display: grid;
  gap: 10px;
  min-width: 120px;
}

.actions .is-active {
  background: #ddebd6;
  border-color: #2f6b3f;
}

body.dark .actions .is-active {
  background: rgba(112, 39, 162, 0.95);
  border-color: #f38bff;
  box-shadow: 0 0 0 1px rgba(243, 139, 255, 0.18), 0 0 22px rgba(184, 75, 255, 0.35);
}

body.dark .topbar .is-active {
  background: rgba(112, 39, 162, 0.95);
  border-color: #f38bff;
  box-shadow: 0 0 0 1px rgba(243, 139, 255, 0.18), 0 0 22px rgba(184, 75, 255, 0.35);
}

.support-link {
  margin: 22px 0 0;
  text-align: center;
}

.support-link a {
  color: var(--support-link);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.15rem;
}

.support-link a:hover {
  text-decoration: underline;
}

@keyframes phan-pop {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(-8px) scale(0.94);
  }

  20% {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }

  80% {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }

  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(-10px) scale(0.98);
  }
}

@media (max-width: 560px) {
  .topbar {
    width: min(100%, 552px);
    flex-direction: column;
    gap: 16px;
  }

  .panel {
    padding: 18px;
  }

  .board {
    gap: 3px;
  }

  .status-bar,
  .controls-area {
    flex-direction: column;
  }

  .lives-block {
    text-align: left;
  }

  .actions {
    width: 100%;
  }
}