.admin-auth-shell {
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: var(--space-6, 1.5rem);
    padding: var(--space-6, 1.5rem);
    background:
        radial-gradient(circle at top left, var(--admin-accent-soft), transparent 28rem),
        radial-gradient(circle at bottom right, var(--overlay-primary-8), transparent 24rem),
        var(--admin-bg);
}

.admin-auth-shell__brand {
    align-items: center;
    color: var(--admin-text);
    display: inline-flex;
    gap: var(--space-2, 0.5rem);
    justify-self: center;
    border-radius: var(--radius-pill, 999rem);
    font-weight: 800;
    letter-spacing: -0.01em;
    padding: 0.4rem 0.65rem;
    text-decoration: none;
    transition: background 0.15s ease, box-shadow 0.15s ease;
}

.admin-auth-shell__brand:hover {
    background: var(--admin-accent-soft);
}

.admin-auth-shell__brand:focus-visible {
    background: var(--admin-accent-soft);
    outline: none;
    box-shadow: var(--focus-ring-primary, 0 0 0 3px rgba(19, 190, 219, 0.3));
}

.admin-auth-shell__brand-mark {
    display: block;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-sm, 0.5rem);
}

.admin-auth-shell__content {
    align-items: center;
    display: grid;
    justify-items: center;
    width: min(100%, 48rem);
    margin: 0 auto;
}

.admin-auth-card,
.admin-placeholder {
    position: relative;
    overflow: hidden;
    width: min(100%, 34rem);
    box-sizing: border-box;
    border-color: var(--border-3d-soft, var(--admin-border));
    background: var(--surface-gradient-soft, var(--color-card-bg));
    box-shadow: var(--shadow-3d-medium, var(--admin-shadow));
}

.admin-auth-card::before,
.admin-placeholder::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 1px;
    background: var(--surface-highlight, rgba(255, 255, 255, 0.1));
    pointer-events: none;
}

.admin-auth-card > :first-child,
.admin-placeholder > :first-child {
    margin-top: 0;
}

.admin-auth-card > :last-child,
.admin-placeholder > :last-child {
    margin-bottom: 0;
}

.admin-auth-card .admin-placeholder__eyebrow,
.admin-placeholder .admin-placeholder__eyebrow {
    margin-bottom: var(--space-2, 0.5rem);
}

.admin-auth-card h1,
.admin-placeholder h1 {
    font-size: clamp(1.9rem, 5vw, 2.5rem);
    letter-spacing: -0.035em;
    line-height: 1.05;
}

.admin-auth-card > p:not(.admin-placeholder__eyebrow):not(.admin-auth-error),
.admin-placeholder > p:not(.admin-placeholder__eyebrow) {
    margin-top: 0;
}

.admin-auth-card form {
    gap: var(--space-3, 0.75rem);
}

.admin-auth-card input,
.admin-auth-card select,
.admin-auth-card textarea {
    box-sizing: border-box;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.admin-auth-card input::placeholder,
.admin-auth-card textarea::placeholder {
    color: var(--admin-muted);
}

.admin-auth-card input:disabled,
.admin-auth-card select:disabled,
.admin-auth-card textarea:disabled {
    background: var(--color-button-disabled-bg, var(--admin-surface-strong));
    color: var(--color-button-disabled-text, var(--admin-muted));
    cursor: not-allowed;
}

.admin-auth-card .admin-primary-button,
.admin-auth-card .admin-secondary-button,
.admin-auth-card .admin-primary-link,
.admin-placeholder .admin-primary-button,
.admin-placeholder .admin-primary-link {
    width: fit-content;
}

.admin-auth-card form .admin-primary-button,
.admin-auth-card form .admin-secondary-button {
    width: 100%;
}

.admin-auth-error {
    border-color: var(--overlay-danger-30);
    background: var(--color-danger-soft-bg);
    color: var(--color-danger-dark) !important;
}

.admin-utility-state {
    align-items: flex-start;
    display: flex;
    gap: 0.65rem;
    margin: var(--space-4, 1rem) 0 0;
    padding: var(--space-3, 0.75rem);
    border: 1px solid var(--admin-border);
    border-radius: var(--radius-md, 0.75rem);
    background: var(--list-surface-bg, var(--admin-surface-strong));
    color: var(--admin-muted);
}

.admin-utility-state--accent {
    border-color: var(--admin-accent-border);
    background: var(--admin-accent-soft);
    color: var(--admin-text);
}

.admin-utility-state--danger {
    border-color: var(--overlay-danger-30);
    background: var(--color-danger-soft-bg);
    color: var(--color-danger-dark);
}

@media (max-width: 640px) {
    .admin-auth-shell {
        gap: var(--space-4, 1rem);
        padding: var(--space-4, 1rem);
    }

    .admin-auth-shell__content {
        align-items: start;
        padding-top: var(--space-4, 1rem);
    }

    .admin-auth-card,
    .admin-placeholder {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .admin-auth-shell__brand,
    .admin-auth-card input,
    .admin-auth-card select,
    .admin-auth-card textarea {
        transition: none;
    }
}