* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background: #0a0e17;
    color: #fff;
    font-family: Arial, sans-serif;
}

.login-shell {
    display: flex;
    min-height: calc(100vh - 60px);
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
    background: radial-gradient(circle at 20% 30%, rgba(30, 18, 183, .6), transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(25, 112, 203, .6), transparent 40%);
}

.login-card {
    width: min(100%, 480px);
    border-radius: 16px;
    background: rgba(255, 255, 255, .96);
}

.login-card .card-body {
    padding: 32px;
}

.captcha-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.captcha-row .form-control {
    min-width: 0;
    height:42px;
}

.captcha-image {
    flex: none;
    border: 1px solid #dee2e6;
    border-radius: 6px;
}

.captcha-refresh {
    flex: none;
    white-space: nowrap;
    font-size: .875rem;
}

.login-footer {
    display: flex;
    min-height: 60px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 12px;
    background: #2b343d;
    color: #c0c0c0;
    text-align: center;
    font-size: .75rem;
}

.login-footer a {
    margin-left: 12px;
    color: #c0c0c0;
    text-decoration: none;
}

@media (max-width: 480px) {
    .login-card .card-body {
        padding: 24px;
    }

    .captcha-row {
        flex-wrap: wrap;
    }
}