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

html, body {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #222;
  overflow: hidden;
  font-family: 'Arial Black', sans-serif;
}

.container {
  text-align: center;
}

h1 {
  font-size: 5rem;
  color: #ffeb3b;
  text-shadow: 0 0 10px #ffeb3b;
  animation: bounce 1s ease infinite, colorflash 4s linear infinite;
}

button {
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  font-size: 1.25rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background: #ff5722;
  color: white;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  transition: transform 0.2s;
}
button:hover {
  transform: scale(1.1);
}

/* Keyframes */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-20px); }
}

@keyframes colorflash {
  0%,100% { color: #ffeb3b; text-shadow: 0 0 10px #ffeb3b; }
  25%     { color: #f44336; text-shadow: 0 0 10px #f44336; }
  50%     { color: #4caf50; text-shadow: 0 0 10px #4caf50; }
  75%     { color: #2196f3; text-shadow: 0 0 10px #2196f3; }
}