body {
    min-height: 100vh;
    margin: 0;
    background: radial-gradient(circle at top, #f8fafc 0%, #eef2f7 45%, #e2e8f0 100%);
    color: #0f172a;
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    align-items: center;
    padding: 2.5rem 1.5rem;
}

.auth-shell::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 15% 15%, rgba(16, 185, 129, 0.12), transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(14, 165, 233, 0.12), transparent 55%);
    z-index: 0;
    pointer-events: none;
}

.auth-container {
    width: min(1100px, 100%);
    margin: 0 auto;
    display: grid;
    gap: 2rem;
    position: relative;
    z-index: 1;
}

.auth-card {
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
    padding: 2.5rem 2.5rem 2.25rem;
}

.auth-card__header {
    margin-bottom: 1.75rem;
}

.brand-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #0f172a, #1f3a5f);
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.3);
}

.auth-kicker {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: #64748b;
    margin-top: 1.5rem;
}

.login-title {
    font-weight: 700;
    font-size: 1.75rem;
    color: #0f172a;
    margin: 0.5rem 0;
}

.login-subtitle {
    color: #64748b;
    font-size: 0.98rem;
    margin: 0;
}

.card-body-login {
    padding: 0;
}

/* The validation summary is a one-item list: no bullet beside the centred message. */
.validation-summary-errors ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.form-floating>.form-control {
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    padding-left: 1rem;
    background: #f8fafc;
}

.form-floating>.form-control:focus {
    border-color: #0f172a;
    box-shadow: 0 0 0 0.25rem rgba(15, 23, 42, 0.12);
    background: #ffffff;
}

.form-floating>label {
    padding-left: 1rem;
    color: #475569;
}

.btn-login {
    border-radius: 12px;
    padding: 0.85rem;
    font-weight: 600;
    font-size: 1rem;
    background: linear-gradient(135deg, #0f172a, #1f3a5f);
    border: none;
    box-shadow: 0 10px 18px rgba(15, 23, 42, 0.25);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 20px rgba(15, 23, 42, 0.3);
}

.login-footer {
    text-align: center;
    margin-top: 1.75rem;
    font-size: 0.9rem;
    color: #475569;
}

.login-footer a {
    color: #0f172a;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

.login-footer a:hover {
    color: #1e40af;
    text-decoration: underline;
}

/* Inline SVG icons (class "bi" kept for the existing placement rules) */
svg.bi {
    width: 1em;
    height: 1em;
    fill: currentColor;
    display: inline-block;
    vertical-align: -0.125em;
    flex-shrink: 0;
}

/* Icon Support for Form Floating */
.form-group-icon {
    position: relative;
}

.form-group-icon .bi {
    position: absolute;
    left: 1.2rem;
    top: 1.2rem;
    z-index: 5;
    color: #94a3b8;
    font-size: 1.2rem;
    transition: color 0.2s ease;
}

.form-group-icon .form-control {
    padding-left: 3.2rem !important;
}

.form-group-icon .form-floating>label {
    padding-left: 3.2rem !important;
}

.form-group-icon .form-control:focus~.bi {
    color: #0f172a;
}

.auth-aside {
    display: none;
    border-radius: 24px;
    padding: 2.5rem;
    background: #0f172a;
    color: #e2e8f0;
    box-shadow: 0 25px 50px rgba(15, 23, 42, 0.35);
    position: relative;
    overflow: hidden;
}

.auth-aside::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top, rgba(255, 255, 255, 0.12), transparent 50%);
    opacity: 0.8;
}

.auth-aside__content {
    position: relative;
    z-index: 1;
}

.auth-aside__logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: rgba(226, 232, 240, 0.7);
}

.auth-aside__headline {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 1rem 0 0.75rem;
    color: #ffffff;
}

.auth-aside__text {
    font-size: 0.95rem;
    color: rgba(226, 232, 240, 0.75);
}

.auth-aside__list {
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.auth-aside__list li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
    color: rgba(226, 232, 240, 0.9);
}

.auth-aside__list .bi {
    font-size: 1rem;
    color: #38bdf8;
}

@media (min-width: 992px) {
    .auth-container {
        grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
        align-items: stretch;
    }

    .auth-card {
        padding: 3rem;
    }

    .auth-aside {
        display: block;
    }
}

/*
 * Dark theme: the sign-in and two-step verification pages follow the operating-system colour scheme, like the
 * app does until the employee picks a theme. Bootstrap 5.3 reads its colours from the variables set on :root.
 */
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --bs-body-bg: #111827;
        --bs-body-color: #e5e7eb;
        --bs-secondary-color: #94a3b8;
        --bs-border-color: #334155;
        --bs-danger-rgb: 252, 165, 165;
        --bs-link-color-rgb: 147, 197, 253;
        --bs-link-hover-color-rgb: 191, 219, 254;
    }

    body {
        background: radial-gradient(circle at top, #1e293b 0%, #0f172a 45%, #0b1220 100%);
        color: #e5e7eb;
    }

    .auth-card {
        background: #111827;
        border: 1px solid #1f2937;
        box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
    }

    .brand-logo {
        background: linear-gradient(135deg, #1d4ed8, #1e3a8a);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
    }

    .auth-kicker,
    .login-subtitle,
    .login-footer {
        color: #94a3b8;
    }

    .login-title {
        color: #f8fafc;
    }

    .form-floating>.form-control,
    .form-control {
        border-color: #334155;
        background: #0f172a;
        color: #f1f5f9;
    }

    .form-floating>.form-control:focus,
    .form-control:focus {
        border-color: #93c5fd;
        box-shadow: 0 0 0 0.25rem rgba(147, 197, 253, 0.25);
        background: #0b1220;
        color: #f8fafc;
    }

    .form-floating>label,
    .form-label {
        color: #cbd5e1;
    }

    .form-group-icon .bi {
        color: #64748b;
    }

    .form-group-icon .form-control:focus~.bi {
        color: #93c5fd;
    }

    .btn-login {
        background: linear-gradient(135deg, #2563eb, #1d4ed8);
        box-shadow: 0 10px 18px rgba(0, 0, 0, 0.4);
    }

    .login-footer a {
        color: #93c5fd;
    }

    .login-footer a:hover {
        color: #bfdbfe;
    }

    .auth-aside {
        background: #111c33;
        border: 1px solid #1e293b;
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    }
}