:root {
  --bg-dark: #010c01;
  --bg-medium: #051505;
  --bg-light: #0a2a0a;
  --accent-green-bright: #39ff14;
  --accent-green-medium: #0f0;
  --accent-green-dark: #0a4d0a;
  --text-color: #a7ff9d;
  --player-color: #00ffff;
  --ai-color: #ffff00;
  --obstacle-color: #ff1493;
  --turtle-color: #228B22;
  --turtle-shell: #90EE90;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 99.9%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body {
  background: radial-gradient(circle, var(--bg-light) 0%, var(--bg-dark) 100%);
  color: var(--text-color);
  font-family: 'VT323', monospace;
  display: flex;
}

#game-container {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  padding: 0;
}

canvas {
  background-color: var(--bg-medium);
  border: 2px solid var(--accent-green-medium);
  box-shadow: 0 0 35px var(--accent-green-medium), inset 0 0 20px var(--accent-green-dark);
  cursor: crosshair;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 10px;
}

.score-display {
  color: var(--text-color);
  font-size: 1.2em;
  height: auto;
  margin-bottom: 15px;
  text-align: center;
  letter-spacing: 1px;
}

h1 {
  font-size: 3.5rem;
  color: var(--accent-green-bright);
  text-shadow: 0 0 15px var(--accent-green-bright);
  letter-spacing: 3px;
  margin: 0 0 20px 0;
}

.info-panel {
  width: 320px;
  flex-shrink: 0;
  padding: 20px;
  border-left: 2px solid var(--accent-green-medium);
  box-shadow: -5px 0 25px var(--accent-green-medium);
  background-color: rgba(5, 21, 5, 0.8);
  backdrop-filter: blur(5px);
  text-align: center;
  overflow-y: auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.info-panel p,
.info-panel li {
  color: var(--text-color);
  font-size: 1.1em;
  line-height: 1.6;
  text-align: left;
}

.info-panel ul {
  padding-left: 20px;
  list-style-type: '>';
}

.info-panel li::marker {
  padding-right: 10px;
}

.hidden {
  display: none;
}

.game-button {
  padding: 15px 30px;
  font-family: 'VT323', monospace;
  font-size: 1.8em;
  color: var(--accent-green-bright);
  background-color: transparent;
  border: 2px solid var(--accent-green-medium);
  box-shadow: 0 0 15px var(--accent-green-medium), inset 0 0 10px var(--accent-green-dark);
  cursor: pointer;
  text-shadow: 0 0 10px var(--accent-green-bright);
  margin-top: 25px;
  transition: all 0.3s ease;
  border-radius: 5px;
}

.game-button:hover,
.game-button:focus {
  background-color: var(--bg-light);
  color: #fff;
  box-shadow: 0 0 25px var(--accent-green-bright), inset 0 0 15px var(--accent-green-dark);
  transform: translateY(-3px);
}

.game-button:active {
  transform: translateY(1px);
}

#play-again-btn {
  display: none;
}