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

header.navbar {
    background-color: #ffffff;
}

main h1 {
    color: #003366;
}

.btn-primary {
    background-color: #0056b3;
    border: none;
}

.btn-primary:hover {
    background-color: #003d80;
}

.grid-opcoes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    padding: 40px;
    max-width: 1100px;
    margin: 0 auto;
}

.box-opcao {
    background: #fff;
    border-radius: 20px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: 0.3s ease;
}

.box-opcao:hover {
    transform: translateY(-6px);
    box-shadow: 0 6px 14px rgba(0,0,0,0.15);
}

.box-opcao img {
    width: 70px;
    margin-bottom: 15px;
}

.box-opcao h3 {
    font-size: 18px;
    color: #333;
    margin: 10px 0 0;
}