:root {
    --bg: #0a0a0f;
    --panel: #0f0f1a;
    --border: #1a1a2e;
    --neon-green: #00ff88;
    --neon-cyan: #00e5ff;
    --neon-pink: #ff0080;
    --neon-yellow: #ffee00;
    --snake-head: #00ff88;
    --snake-body: #00cc66;
    --food-color: #ff0080;
    --grid-color: rgba(255,255,255,0.03);
    --glow-green: 0 0 10px #00ff88, 0 0 20px #00ff88, 0 0 40px #00ff8844;
    --glow-pink: 0 0 10px #ff0080, 0 0 20px #ff0080, 0 0 40px #ff008044;
    --glow-cyan: 0 0 10px #00e5ff, 0 0 20px #00e5ff, 0 0 40px #00e5ff44;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg);
    color: #fff;
    font-family: 'Orbitron', monospace;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
  }

  /* Animated scanline background */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,255,136,0.015) 2px,
      rgba(0,255,136,0.015) 4px
    );
    pointer-events: none;
    z-index: 0;
  }

  /* Ambient corner glows */
  body::after {
    content: '';
    position: fixed;
    inset: 0;
    background:
      radial-gradient(ellipse at 0% 0%, rgba(0,229,255,0.06) 0%, transparent 50%),
      radial-gradient(ellipse at 100% 100%, rgba(255,0,128,0.06) 0%, transparent 50%),
      radial-gradient(ellipse at 100% 0%, rgba(0,255,136,0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
  }

  .wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }

  /* HEADER */
  .header {
    text-align: center;
    letter-spacing: 0.3em;
  }

  .title {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(1.4rem, 4vw, 2.2rem);
    color: var(--neon-green);
    text-shadow: var(--glow-green);
    animation: titlePulse 3s ease-in-out infinite;
  }

  .subtitle {
    font-size: 0.5rem;
    color: var(--neon-cyan);
    letter-spacing: 0.5em;
    margin-top: 6px;
    opacity: 0.7;
  }

  @keyframes titlePulse {
    0%, 100% { text-shadow: var(--glow-green); }
    50% { text-shadow: 0 0 20px #00ff88, 0 0 60px #00ff88, 0 0 100px #00ff8888; }
  }

  /* STATS BAR */
  .stats-bar {
    display: flex;
    gap: 30px;
    align-items: center;
  }

  .stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
  }

  .stat-label {
    font-size: 0.45rem;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.2em;
  }

  .stat-value {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.9rem;
    color: var(--neon-yellow);
    text-shadow: 0 0 10px var(--neon-yellow);
    transition: transform 0.1s;
  }

  .stat-value.bump {
    transform: scale(1.3);
  }

  .stat-divider {
    width: 1px;
    height: 30px;
    background: linear-gradient(to bottom, transparent, var(--neon-cyan), transparent);
    opacity: 0.3;
  }

  /* GAME ARENA */
  .arena {
    position: relative;
    border: 1px solid rgba(0,229,255,0.2);
    box-shadow:
      0 0 0 1px rgba(0,229,255,0.1),
      0 0 40px rgba(0,229,255,0.05),
      inset 0 0 80px rgba(0,0,0,0.5);
    background: var(--panel);
    border-radius: 4px;
    overflow: hidden;
  }

  /* Animated corner brackets */
  .arena::before, .arena::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: var(--neon-cyan);
    border-style: solid;
    z-index: 10;
    opacity: 0.8;
  }
  .arena::before { top: 6px; left: 6px; border-width: 2px 0 0 2px; }
  .arena::after  { bottom: 6px; right: 6px; border-width: 0 2px 2px 0; }

  canvas {
    display: block;
  }

  /* OVERLAY SCREENS */
  .overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(10,10,15,0.88);
    backdrop-filter: blur(4px);
    z-index: 20;
    gap: 20px;
    transition: opacity 0.3s;
  }

  .overlay.hidden { display: none; }

  .overlay-title {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(0.8rem, 3vw, 1.2rem);
    text-align: center;
    line-height: 1.8;
  }

  .overlay-title.green { color: var(--neon-green); text-shadow: var(--glow-green); }
  .overlay-title.pink  { color: var(--neon-pink); text-shadow: var(--glow-pink); }

  .overlay-msg {
    font-size: 0.55rem;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.15em;
    text-align: center;
    line-height: 2;
  }

  .final-score-label {
    font-size: 0.5rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.3em;
    margin-bottom: -10px;
  }

  .final-score-value {
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    color: var(--neon-yellow);
    text-shadow: 0 0 20px var(--neon-yellow);
  }

  /* BTN */
  .btn {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.65rem;
    padding: 14px 30px;
    background: transparent;
    border: 2px solid var(--neon-green);
    color: var(--neon-green);
    cursor: pointer;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    position: relative;
    transition: all 0.2s;
    clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
  }

  .btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--neon-green);
    opacity: 0;
    transition: opacity 0.2s;
  }

  .btn:hover {
    color: var(--bg);
    box-shadow: var(--glow-green);
  }
  .btn:hover::before { opacity: 1; }
  .btn:hover span { position: relative; z-index: 1; }

  .btn span { position: relative; z-index: 1; }

  /* SPEED INDICATOR */
  .speed-bar-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .speed-label {
    font-size: 0.4rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.2em;
    width: 40px;
  }

  .speed-pips {
    display: flex;
    gap: 4px;
  }

  .pip {
    width: 8px;
    height: 12px;
    border: 1px solid rgba(0,229,255,0.3);
    border-radius: 2px;
    transition: background 0.3s, box-shadow 0.3s;
  }

  .pip.active {
    background: var(--neon-cyan);
    box-shadow: var(--glow-cyan);
    border-color: var(--neon-cyan);
  }

  /* CONTROLS HINT */
  .controls-hint {
    display: flex;
    gap: 16px;
    opacity: 0.4;
  }

  .key-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.38rem;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.6);
  }

  .key {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.35rem;
    padding: 3px 6px;
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 3px;
    background: rgba(255,255,255,0.05);
  }

  /* PARTICLE canvas */
  #particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
  }