* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f4f4f9;
}

.container {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 400px;
}

h2 {
    color: #333;
    margin-bottom: 10px;
}

p {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

input {
    padding: 12px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    outline: none;
}

input:focus {
    border-color: #007bff;
}

button {
    padding: 12px;
    font-size: 16px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

#resultado {
    font-size: 18px;
    font-weight: bold;
    min-height: 24px; 
}


.valido {
    color: #28a745; 
}

.invalido {
    color: #dc3545; 
}