body {
  background-color: black;
  color: lime;
  font-family: monospace;
  padding: 20px;
}

.hacker-title {
  text-align: center;
  font-size: 2em;
  color: lime;
  font-family: monospace;
  margin-bottom: 30px;
  text-shadow: 0 0 5px lime, 0 0 10px lime;
  animation: flicker 1.5s infinite;
}

@keyframes flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {
    opacity: 1;
  }
  20%, 22%, 24%, 55% {
    opacity: 0.4;
  }
}

.terminal {
  max-width: 600px;
  margin: auto;
}

.line {
  margin: 10px 0;
}

input {
  background: black;
  color: lime;
  border: none;
  border-bottom: 1px solid lime;
  font-family: monospace;
  font-size: 1em;
  width: 200px;
}

button {
  background: black;
  color: lime;
  border: 1px solid lime;
  padding: 5px 10px;
  font-family: monospace;
  cursor: pointer;
}

.dots::after {
  content: "";
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}