:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f242d;
  --text: #e6e8ee;
  --muted: #9aa3b2;
  --accent: #5cc8ff;
  --grid-bg: #11141a;
  --cell-bg: #1a1f28;
  --cell-bg-2: #1d222c;
  --cell-border: #232936;
  --food: #ff6b6b;
  --food-glow: rgba(255, 107, 107, 0.45);
  --hint: rgba(92, 200, 255, 0.18);
  --miss: rgba(255, 107, 107, 0.35);
  --player: #5cc8ff;
  --player-head: #b9e6ff;
  --bot-1: #ffb454;
  --bot-2: #b07cff;
  --bot-3: #6dd6a3;
  --bot-4: #ff7ab6;
  --bot-5: #f7d160;
  --cell-size: 32px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  min-height: 100vh;
}

header {
  padding: 16px 24px 0;
}
header h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.5px;
}
.tagline {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

main {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 16px 24px 32px;
  align-items: start;
}

#hud {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: sticky;
  top: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--cell-border);
  border-radius: 10px;
  padding: 12px 14px;
}
.panel h2 {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
}
.panel ul, .panel ol {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.5;
}
.panel label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  margin-bottom: 8px;
  gap: 8px;
}
.panel input[type="number"], .panel select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--cell-border);
  border-radius: 6px;
  padding: 4px 6px;
  font-size: 13px;
  width: 90px;
}
.panel button {
  width: 100%;
  margin-top: 6px;
  background: var(--accent);
  color: #07131c;
  border: 0;
  border-radius: 6px;
  padding: 8px;
  font-weight: 600;
  cursor: pointer;
}
.panel button:hover { filter: brightness(1.1); }
kbd {
  background: var(--panel-2);
  border: 1px solid var(--cell-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.legend.food {
  display: inline-block;
  background: var(--food);
  color: #2a0707;
  border-radius: 4px;
  padding: 0 4px;
  font-weight: 700;
}

#scoreboard {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.score-row {
  display: grid;
  grid-template-columns: 14px 1fr auto auto;
  align-items: center;
  gap: 8px;
  background: var(--panel-2);
  border: 1px solid var(--cell-border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
}
.score-row .swatch {
  width: 12px; height: 12px; border-radius: 3px;
}
.score-row .name { font-weight: 600; }
.score-row .meta { color: var(--muted); font-variant-numeric: tabular-nums; }
.score-row.dead { opacity: 0.5; text-decoration: line-through; }

#board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

#grid {
  display: grid;
  gap: 2px;
  padding: 8px;
  background: var(--grid-bg);
  border: 1px solid var(--cell-border);
  border-radius: 10px;
  user-select: none;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  background: var(--cell-bg);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: calc(var(--cell-size) * 0.55);
  font-weight: 600;
  color: #c8cfdb;
  position: relative;
  transition: background-color 80ms linear, transform 80ms linear;
}
.cell.alt { background: var(--cell-bg-2); }

.cell.hint {
  background: var(--hint);
  color: var(--player-head);
}

.cell.miss-flash {
  background: var(--miss) !important;
}

.cell.food {
  background: var(--food);
  color: #2a0707;
  box-shadow: 0 0 0 0 var(--food-glow);
  animation: pulse 1.6s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--food-glow); }
  70%  { box-shadow: 0 0 0 10px rgba(255,107,107,0); }
  100% { box-shadow: 0 0 0 0 rgba(255,107,107,0); }
}

.cell.snake {
  color: rgba(255,255,255,0.0);
}
.cell.snake.head {
  color: #0a0d12;
  font-weight: 800;
}
.cell.snake[data-pid="0"] { background: var(--player); }
.cell.snake.head[data-pid="0"] { background: var(--player-head); }
.cell.snake[data-pid="1"] { background: var(--bot-1); }
.cell.snake[data-pid="2"] { background: var(--bot-2); }
.cell.snake[data-pid="3"] { background: var(--bot-3); }
.cell.snake[data-pid="4"] { background: var(--bot-4); }
.cell.snake[data-pid="5"] { background: var(--bot-5); }

#status {
  min-height: 24px;
  font-size: 14px;
  color: var(--muted);
}
#status.gameover {
  color: var(--food);
  font-weight: 600;
}