body {
    background: linear-gradient(135deg, #4e73df, #1cc88a);
    min-height: 100vh; /* evita corte em telas maiores */
    margin: 0;
    display: flex;
    flex-direction: column; /* permite empilhar conteúdo + footer */
    align-items: center;
    justify-content: center;
    font-family: Arial, Helvetica, sans-serif;
}

.container {
    max-width: 500px;
    width: 100%;
}

/* Card principal */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-3px);
}

h3 {
    font-weight: bold;
    color: #333;
}

/* Input */
input.form-control {
    border-radius: 8px 0 0 8px;
    padding: 10px;
    font-size: 16px;
}

input.form-control:focus {
    box-shadow: none;
    border-color: #4e73df;
}

/* Botão */
button.btn {
    border-radius: 0 8px 8px 0;
    padding: 10px 20px;
    font-weight: bold;
    transition: 0.2s;
}

button.btn:hover {
    transform: scale(1.05);
}

/* Resultado */
#resultado .card {
    margin-top: 20px;
    background: #f8f9fc;
}

#resultado p {
    margin: 6px 0;
    font-size: 15px;
}

/* Ajuste do footer */
h2 {
    font-size: 14px;
    color: #fff;
}