body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.btn-lg, .btn-group-lg > .btn {
    padding: 1rem 1.5rem;
    font-size: 1.25rem;
}

.navbar-brand {
    font-weight: bold;
}

.card {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border: none;
}

.display-1 {
    font-size: 6rem;
    line-height: 1;
}

@media (max-width: 768px) {
    .display-1 {
        font-size: 4rem;
    }
    .display-6 {
        font-size: 1.5rem;
    }
}

.placar-tela {
    font-size: 5rem;
    font-weight: bold;
    text-align: center;
    min-width: 120px;
}