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

body {
  background-color: #000;
  color: #fff;
  font-family: Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.container {
  max-width: 400px;
  width: 100%;
  background: rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 0 15px #fff4;
}

h2 {
  text-align: center;
  margin-bottom: 20px;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 8px;
  border: 1px solid #fff;
  background: transparent;
  color: #fff;
  font-size: 16px;
}

input::placeholder {
  color: #ccc;
}

button {
  margin-top: 25px;
  width: 100%;
  padding: 12px;
  font-size: 16px;
  background-color: #fff;
  color: #000;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #ddd;
}

#result {
  margin-top: 20px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  color: #fff;
}

footer {
  margin-top: 30px;
  text-align: center;
  color: #aaa;
  font-size: 14px;
}