:root {
  color-scheme: dark;
  --bg: #12151f;
  --panel: #1f2536;
  --accent: #78ff9f;
  --danger: #ff6b81;
  --text: #f6f8ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", Arial, sans-serif;
  background: radial-gradient(circle at top, #1f2845 0%, var(--bg) 50%);
  color: var(--text);
}

.game-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.hud {
  background: var(--panel);
  border-radius: 14px;
  padding: 1rem 1.25rem;
}

.hud h1 {
  margin: 0;
}

.subtitle {
  margin: 0.25rem 0 0.85rem;
  opacity: 0.85;
}

.stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.stats span {
  background: #2a334a;
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
}

.arena-wrap {
  background: var(--panel);
  border-radius: 14px;
  padding: 0.75rem;
}

.arena {
  position: relative;
  width: 100%;
  max-width: 860px;
  height: 480px;
  margin: 0 auto;
  border: 2px solid #374466;
  border-radius: 12px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    #171d2d;
  background-size: 30px 30px;
  overflow: hidden;
}

.player,
.food {
  position: absolute;
  width: 30px;
  height: 30px;
  border-radius: 50%;
}

.player {
  background: linear-gradient(145deg, #ffd36c, #ffae36);
  box-shadow: 0 0 14px rgba(255, 206, 102, 0.6);
  border: 2px solid #553100;
}

.food {
  background-color: transparent;
  border: none;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  border-radius: 6px;
}

.bad {
  filter: saturate(1.1) brightness(0.95);
}

.controls {
  background: var(--panel);
  border-radius: 14px;
  padding: 0.9rem 1.25rem 1.25rem;
}

#startBtn {
  margin-top: 0.35rem;
  background: var(--accent);
  color: #001007;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  padding: 0.65rem 1rem;
  cursor: pointer;
}

#startBtn:hover {
  filter: brightness(1.06);
}

.message {
  margin-bottom: 0;
  min-height: 1.2rem;
}

kbd {
  padding: 0.1rem 0.35rem;
  border: 1px solid #7180aa;
  border-radius: 6px;
  background: #121729;
}

@media (max-width: 700px) {
  .arena {
    height: 380px;
  }

  .player,
  .food {
    width: 26px;
    height: 26px;
  }
}