body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f4f4f4; }
header { background: #d62828; color: white; padding: 20px; text-align: center; }
main { padding: 20px; }
h2 { color: #333; }
#cartelas ul { list-style: none; padding: 0; }
#cartelas li { background: #fff; margin: 5px 0; padding: 10px; border-left: 5px solid #0077b6; }
#sorteio { margin-top: 30px; }
input, button { padding: 10px; margin: 5px 0; }
#resultado { margin-top: 15px; font-size: 1.2em; font-weight: bold; }