body {
  background: #111;
  color: #fff;
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}
#pong {
  background: #222;
  display: block;
  margin: 20px auto;
  border: 2px solid #fff;
  box-shadow: 0 0 20px #000;
}
#scoreboard {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  background: rgba(34,34,34,0.95);
  padding: 10px 32px;
  border-radius: 0 0 16px 16px;
  font-size: 2.2rem;
  margin: 0;
  letter-spacing: 2px;
  box-shadow: 0 2px 12px #0008;
}
#win-message {
  font-size: 2.5rem;
  color: #0f0;
  margin-top: 20px;
  text-align: center;
  font-weight: bold;
}
#instructions {
  background: #222;
  color: #fff;
  padding: 16px 24px;
  border-radius: 8px;
  margin-top: 24px;
  max-width: 400px;
  text-align: left;
  box-shadow: 0 2px 12px #0008;
}
#instructions h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.2rem;
}
#instructions ul {
  margin: 0;
  padding-left: 20px;
}
#restart-btn {
  display: block;
  margin: 18px auto 0 auto;
  padding: 10px 28px;
  font-size: 1.1rem;
  background: #0f0;
  color: #111;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  box-shadow: 0 2px 8px #0006;
  transition: background 0.2s;
}
#restart-btn:hover {
  background: #0c0;
}
#mobile-controls {
  display: none;
  justify-content: center;
  gap: 18px;
  margin: 18px 0 0 0;
}
#mobile-controls button {
  font-size: 2.2rem;
  padding: 18px 32px;
  background: #333;
  color: #0f0;
  border: none;
  border-radius: 50%;
  box-shadow: 0 2px 8px #0006;
  cursor: pointer;
  margin: 0 8px;
  transition: background 0.2s, color 0.2s;
}
#mobile-controls button:active {
  background: #0f0;
  color: #111;
}
@media (max-width: 700px) {
  #pong {
    width: 98vw !important;
    height: 60vw !important;
    max-width: 100vw;
    max-height: 70vw;
  }
  #mobile-controls {
    display: flex;
  }
  #instructions, #restart-btn, #scoreboard, #win-message {
    max-width: 98vw;
  }
  #scoreboard {
    font-size: 2rem;
    padding: 8px 10vw;
    max-width: 98vw;
  }
}