body {
  background: #000;
  color: #00ff99;
  font-family: monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  width: 400px;
  border: 2px solid #00ff99;
  padding: 25px;
  background: rgba(0,0,0,0.85);
  box-shadow: 0 0 20px #00ff99;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

input[type="number"] {
  width: 100%;
  padding: 8px;
  margin: 10px 0;
  background: #000;
  color: #00ff99;
  border: 1px solid #00ff99;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 12px;
  background: #00ff99;
  color: #000;
  border: none;
  cursor: pointer;
}

button:hover {
  box-shadow: 0 0 15px #00ff99;
}

.result-box {
  margin-top: 20px;
}

#result {
  border: 1px dashed #00ff99;
  padding: 10px;
  min-height: 40px;
  word-wrap: break-word;
}

.copy-btn {
  margin-top: 10px;
}

.strength {
  margin-top: 15px;
  font-weight: bold;
}

/* FOOTER */
footer {
  text-align: center;
  margin-top: 60px;
  font-size: 0.9rem;
  color: #7dd3fc;
}