body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: #fff;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: auto;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
}

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

form input, .controls input {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  border-radius: 6px;
  border: none;
}

button {
  padding: 10px;
  margin: 5px 0;
  background: #00bcd4;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #0097a7;
}

#output {
  margin-top: 20px;
}

#summary {
  margin-bottom: 20px;
  padding: 10px;
  background: rgba(255,255,255,0.2);
  border-radius: 8px;
}

.alert {
  animation: pulse 1s infinite;
  color: red;
  font-weight: bold;
  margin-top: 10px;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}