body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 100%;
}

h1 {
    color: #1a73e8;
    margin-bottom: 1rem;
}

.input-group {
    margin: 1.5rem 0;
}

input[type="number"] {
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    width: 120px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

input[type="number"]:focus {
    border-color: #1a73e8;
}

button {
    padding: 0.8rem 1.5rem;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-left: 0.5rem;
}

button:hover {
    background-color: #1557b0;
}

#message {
    margin-top: 1.5rem;
    font-weight: bold;
    min-height: 1.5rem;
}

.success {
    color: #28a745;
}

.error {
    color: #dc3545;
}

#resetButton {
    background-color: #6c757d;
    margin-top: 1rem;
    margin-left: 0;
}

#resetButton:hover {
    background-color: #5a6268;
}