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

body {
    min-height: 100vh;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,.1);
    width: 90%;
    max-width: 600px;
    text-align: center;
}

h1 { margin-bottom: 1rem; }
p { margin-bottom: 2rem; }

.input-section {
    display: flex;
    gap: 10px;
    margin-bottom: 2rem;
}

input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover { background: #0056b3; }

.response {
    font-size: 24px;
    font-weight: bold;
    min-height: 40px;
}