body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    width: 350px;
}

h1 { color: #d32f2f; margin-bottom: 0.5rem; }
p { color: #666; font-size: 0.9rem; }

.input-group {
    margin-top: 1.5rem;
    display: flex;
    gap: 10px;
}

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

button {
    padding: 10px 15px;
    background-color: #d32f2f;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover { background-color: #b71c1c; }

.result-container {
    margin-top: 2rem;
    padding: 1rem;
    border-top: 2px solid #eee;
}

.hidden { display: none; }