* { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    font-family: 'Segoe UI', Tahoma, sans-serif;
    color: #fff;
    padding: 20px;
    user-select: none;
  }
  h1 {
    margin-bottom: 10px;
    font-size: 2rem;
    text-shadow: 0 2px 8px rgba(0,0,0,0.4);
  }
  .scoreboard {
    display: flex;
    gap: 20px;
    margin-bottom: 12px;
    font-size: 1.1rem;
  }
  .scoreboard span {
    background: rgba(255,255,255,0.15);
    padding: 6px 14px;
    border-radius: 20px;
    backdrop-filter: blur(6px);
  }
  .game-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  }
  canvas {
    display: block;
    background: #0f1e3d;
  }
  .overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.75);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
    backdrop-filter: blur(4px);
  }
  .overlay.hidden { display: none; }
  .overlay h2 { font-size: 1.8rem; margin-bottom: 10px; }
  .overlay p { margin-bottom: 18px; opacity: 0.85; line-height: 1.5; }
  button {
    background: linear-gradient(135deg, #00c9a7, #0097b2);
    color: #fff;
    border: none;
    padding: 12px 28px;
    font-size: 1rem;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    font-weight: 600;
    box-shadow: 0 4px 14px rgba(0,201,167,0.4);
  }
  button:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,201,167,0.6); }
  button:active { transform: translateY(0); }
  .controls {
    margin-top: 14px;
    font-size: 0.9rem;
    opacity: 0.75;
    text-align: center;
  }
  .mobile-pad {
    display: none;
    margin-top: 16px;
    grid-template-columns: repeat(3, 60px);
    grid-template-rows: repeat(3, 60px);
    gap: 6px;
  }
  .mobile-pad button {
    width: 60px; height: 60px; padding: 0;
    border-radius: 12px; font-size: 1.5rem;
  }
  .mobile-pad .up { grid-column: 2; grid-row: 1; }
  .mobile-pad .left { grid-column: 1; grid-row: 2; }
  .mobile-pad .right { grid-column: 3; grid-row: 2; }
  .mobile-pad .down { grid-column: 2; grid-row: 3; }
  @media (max-width: 600px) {
    .mobile-pad { display: grid; }
    canvas { max-width: 90vw; max-height: 90vw; }
  }