:root {
  color-scheme: light;
  --bg: #f3f1eb;
  --panel: #fffdf7;
  --line: #d4ccbd;
  --text: #2e2a22;
  --muted: #6f675b;
  --snake-green: #2e6a4f;
  --snake-green-head: #214b38;
  --snake-blue: #2f5aa8;
  --snake-blue-head: #213e73;
  --food: #bc4b35;
  --button: #ece6d8;
  --button-hover: #ddd4c2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: linear-gradient(180deg, #f7f4ec 0%, var(--bg) 100%);
  color: var(--text);
}

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

.panel {
  width: fit-content;
  max-width: calc(100vw - 48px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(46, 42, 34, 0.08);
}

.panel-header,
.status-row,
.network-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.panel-header {
  align-items: stretch;
}

.hero h1 {
  margin: 0;
  font-size: 2rem;
}

.panel-header p,
.hint {
  margin: 6px 0 0;
  color: var(--muted);
}

.panel-header .intro {
  margin: 0;
}

.scoreboard {
  display: flex;
  gap: 10px;
  align-items: stretch;
  align-self: stretch;
}

.score-card {
  min-width: 86px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  text-align: right;
  background: #f9f5ea;
}

.score-card span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.score-card strong {
  font-size: 1.6rem;
}

.score-green {
  border-color: rgba(46, 106, 79, 0.35);
}

.score-blue {
  border-color: rgba(47, 90, 168, 0.35);
}

.status-row {
  margin-top: 18px;
}

.network-row {
  margin-top: 18px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #faf7ef;
  color: var(--muted);
}

.actions,
.controls-grid {
  display: flex;
  gap: 8px;
}

button {
  border: 1px solid var(--line);
  background: var(--button);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font: inherit;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  background: var(--button-hover);
}

button:disabled {
  cursor: default;
  opacity: 0.5;
}

.board-shell {
  margin-top: 18px;
  width: fit-content;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.board {
  width: max-content;
  margin-left: auto;
  margin-right: auto;
  display: grid;
  gap: 2px;
  background: var(--line);
  padding: 2px;
  border-radius: 12px;
  touch-action: none;
}

.cell {
  width: 28px;
  aspect-ratio: 1;
  background: #f7f4ec;
}

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

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

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

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

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

.cell.crash {
  background: #111111;
}

.controls-panel {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.control-block {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #faf7ef;
}

.control-block.inactive {
  display: none;
}

.control-block h2 {
  margin: 0;
  font-size: 1rem;
}

.control-block p {
  margin: 4px 0 0;
  color: var(--muted);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 56px));
  grid-template-areas:
    ". up ."
    "left down right";
  justify-content: center;
}

.control.up { grid-area: up; }
.control.left { grid-area: left; }
.control.down { grid-area: down; }
.control.right { grid-area: right; }

.hint a {
  color: inherit;
}

@media (max-width: 640px) {
  .panel {
    padding: 16px;
  }

  .panel-header,
  .status-row,
  .network-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .scoreboard {
    width: 100%;
  }

  .score-card {
    flex: 1;
    text-align: left;
  }

  .controls-panel {
    grid-template-columns: 1fr;
  }
}