body {
    font-family: "Segoe UI", system-ui, sans-serif;
    background: #f5f6fb;
    display: flex;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
}

main {
    background: #fff;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    width: min(360px, 90vw);
}

h1 {
    margin-bottom: 1.25rem;
    font-size: 1.5rem;
}

label {
    font-size: 0.9rem;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.5rem;
    margin: 0.35rem 0 1rem;
    border: 1px solid #ccd0d7;
    border-radius: 4px;
}

button {
    width: 100%;
    padding: 0.75rem;
    border: 0;
    border-radius: 4px;
    background: #0d6efd;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
}

.flash {
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    background: #ffe3e3;
    color: #8b1c1c;
}