body {
  background: linear-gradient(135deg, #232526 0%, #414345 100%);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#join-screen {
  background: rgba(40, 46, 60, 0.82);
  backdrop-filter: blur(8px);
  border-radius: 1.5em;
  box-shadow: 0 4px 32px rgba(0,0,0,0.32);
  padding: 2.5em 2em 2em 2em;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 2em;
  animation: fadeIn 0.7s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-24px); }
  to { opacity: 1; transform: translateY(0); }
}

#username {
  font-size: 1.1em;
  border: none;
  outline: none;
  background: rgba(255,255,255,0.12);
  border-radius: 1em;
  padding: 0.8em 1.1em;
  margin-bottom: 1.1em;
  color: #ececec;
  box-shadow: 0 1px 8px rgba(50,50,50,0.12);
  transition: background 0.2s, color 0.2s;
}
#username:focus {
  background: rgba(255,255,255,0.24);
  color: #333;
}

#join-btn {
  font-size: 1.1em;
  letter-spacing: 1px;
  border: none;
  border-radius: 1em;
  background: linear-gradient(90deg, #43cea2, #185a9d);
  color: #fff;
  padding: 0.7em 1.5em;
  box-shadow: 0 2px 12px rgba(68,202,218,0.15);
  cursor: pointer;
  transition: background 0.18s, transform 0.11s;
}
#join-btn:hover {
  background: linear-gradient(90deg, #43cea2 75%, #348ac7 100%);
  transform: translateY(-2px) scale(1.04);
}

#game-canvas {
  display: block;
  margin: 0 auto;
  box-shadow: 0 7px 36px rgba(0,0,0,0.38);
  border-radius: 1.3em;
  max-width: 96vw;
  max-height: 80vh;
}