* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Arial", sans-serif;
  background: linear-gradient(135deg, #00c6ff, #0072ff); /* teal to blue gradient */
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
}

.container {
  background: #e6f7ff; /* soft light blue */
  color: #333;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  width: 400px;
}

h1 {
  margin-bottom: 20px;
  text-align: center;
  color: #0072ff;
}

#result {
  text-align: center;
  margin: 20px auto;
}
#error {
  text-align: center;
  color: red;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
  outline: none;
  transition: border-color 0.3s ease;
}

input:focus {
  border-color: #0072ff;
}

button {
  width: 100%;
  padding: 10px;
  background: #0072ff;
  color: white;
  font-size: 16px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

button:hover {
  background: #0056cc;
  transform: scale(1.05);
}