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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f0f2f5;
  font-family: sans-serif;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  background: #fff;
  padding: 36px;
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
  width: 340px;
}

h2 {
  margin-bottom: 6px;
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 14px;
}

button {
  width: 100%;
  padding: 10px;
  background: #4f46e5;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
}

button:hover {
  background: #4338ca;
}

#result {
  font-size: 14px;
  text-align: center;
}

.success { color: green; }
.error   { color: red;   }