body {
    font-family: "Segoe UI", system-ui, sans-serif;
    margin: 0;
    background: #f7f8fc;
    color: #111;
}

header {
    background: #0d6efd;
    padding: 1rem 2rem;
    color: #fff;
}

main {
    padding: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.flash {
    padding: 0.85rem 1rem;
    border-radius: 4px;
    background: #ffe3e3;
    color: #8b1c1c;
    margin-bottom: 1rem;
}