:root {
    --admin-bg: #f4f6fb;
    --admin-surface: #ffffff;
    --admin-border: #dfe6f1;
    --admin-text: #1b223c;
    --admin-text-muted: #66728a;
    --admin-sidebar-bg: #1d2433;
    --admin-radius-sm: 8px;
    --admin-shadow: 0 8px 20px rgba(17, 27, 56, 0.06);
    --admin-control-height: 42px;
}

body.auth-body {
    background: linear-gradient(180deg, #eef3fb 0%, #f7f9fc 100%);
    color: var(--admin-text);
    font-size: 0.95rem;
}

.auth-shell {
    align-items: center;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem 1rem;
}

.auth-card {
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 18px;
    box-shadow: 0 22px 48px rgba(17, 27, 56, 0.12);
    margin: 0 auto;
    max-width: 520px;
    overflow: hidden;
    width: 100%;
}

.auth-card .card-header {
    background: var(--admin-sidebar-bg);
    border-bottom: 0;
    color: #fff;
    padding: 1.35rem 1.5rem;
}

.auth-card .card-body {
    padding: 2rem 1.5rem 1.6rem;
}

.auth-brand {
    align-items: center;
    display: inline-flex;
    gap: 0.9rem;
}

.auth-brand .brand-name {
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
}

.auth-title {
    color: var(--admin-text);
    font-size: 1.55rem;
    font-weight: 600;
    line-height: 1.15;
    margin-bottom: 0.35rem;
}

.auth-shell .form-group {
    margin-bottom: 0.9rem;
}

.auth-shell .form-label,
.auth-shell .form-group > label {
    color: #3f4c69;
    display: block;
    font-size: 0.79rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    margin-bottom: 0.45rem;
    text-transform: uppercase;
}

.auth-shell .form-control,
.auth-shell .form-select {
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    color: var(--admin-text);
    display: block;
    line-height: 1.35;
    min-height: var(--admin-control-height);
    padding: 0.56rem 0.85rem;
    width: 100%;
}

.auth-shell .form-control.input-lg {
    min-height: 48px;
}

.auth-shell .form-control:focus,
.auth-shell .form-select:focus {
    border-color: #505f80;
    box-shadow: 0 0 0 0.18rem rgba(76, 132, 255, 0.2);
}

.auth-shell .btn {
    border-radius: var(--admin-radius-sm);
    font-weight: 500;
}

@media (max-width: 767.98px) {
    .auth-shell {
        padding: 1.25rem 0.85rem;
    }

    .auth-card .card-body {
        padding: 1.5rem 1rem 1.2rem;
    }
}