.app-shell {
    display: grid;
    grid-template-columns: 17rem minmax(0, 1fr);
    min-height: 100vh;
}

.app-shell--collapsed {
    grid-template-columns: 5rem minmax(0, 1fr);
}

.app-shell__main {
    min-width: 0;
}

.app-shell__content {
    display: grid;
    gap: var(--space-5);
    padding: var(--space-5);
}

.app-shell__overlay {
    display: none;
}

.app-sidebar {
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    min-height: 100vh;
    padding: var(--space-4);
    position: sticky;
    top: 0;
    z-index: var(--z-sidebar);
}

.app-sidebar__brand {
    align-items: center;
    display: flex;
    gap: var(--space-3);
    min-height: 2.75rem;
}

.app-sidebar__logo,
.auth-layout__mark {
    align-items: center;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    color: var(--color-surface);
    display: inline-flex;
    font-weight: var(--font-weight-bold);
    height: 2.5rem;
    justify-content: center;
    width: 2.5rem;
}

.app-sidebar__brand-text {
    display: grid;
    line-height: var(--line-height-tight);
}

.app-sidebar__brand-text span {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

.app-sidebar__nav {
    display: grid;
    gap: var(--space-5);
}

.app-sidebar__collapse,
.app-nav-item,
.app-icon-button,
.app-button {
    align-items: center;
    border-radius: var(--radius-md);
    display: inline-flex;
    gap: var(--space-2);
    min-height: 2.5rem;
    transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.app-sidebar__collapse {
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    justify-content: center;
    margin-top: auto;
    padding: 0 var(--space-3);
}

.app-shell--collapsed .app-sidebar__brand-text,
.app-shell--collapsed .app-sidebar__collapse span,
.app-shell--collapsed .app-nav-group h2,
.app-shell--collapsed .app-nav-item span {
    display: none;
}

.app-shell--collapsed .app-sidebar__collapse .app-icon {
    transform: rotate(180deg);
}

.app-nav-group {
    display: grid;
    gap: var(--space-2);
}

.app-nav-group h2 {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    margin: 0;
    text-transform: uppercase;
}

.app-nav-group__items {
    display: grid;
    gap: var(--space-1);
}

.app-nav-item {
    border: 1px solid transparent;
    color: var(--color-text-muted);
    min-width: 0;
    padding: 0 var(--space-3);
    position: relative;
    text-decoration: none;
}

.app-nav-item:hover,
.app-nav-item:focus-visible {
    background: var(--color-surface-muted);
    color: var(--color-text);
}

.app-nav-item.active {
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
    border-color: color-mix(in srgb, var(--color-primary) 32%, transparent);
    color: var(--color-primary);
}

.app-nav-item.active::before {
    background: var(--color-primary);
    border-radius: var(--radius-full);
    bottom: var(--space-2);
    content: "";
    left: var(--space-1);
    position: absolute;
    top: var(--space-2);
    width: 3px;
}

.app-topbar {
    align-items: center;
    background: color-mix(in srgb, var(--color-surface) 92%, transparent);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    gap: var(--space-3);
    min-height: 4rem;
    padding: 0 var(--space-5);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.app-topbar__menu {
    display: none;
}

.app-topbar__product {
    display: grid;
    line-height: var(--line-height-tight);
}

.app-topbar__product span,
.app-topbar__user strong {
    font-weight: var(--font-weight-semibold);
}

.app-topbar__product small {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

.app-topbar__actions {
    align-items: center;
    display: flex;
    gap: var(--space-2);
    margin-left: auto;
}

.app-icon-button {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    justify-content: center;
    padding: 0;
    width: 2.5rem;
}

.app-icon-button:hover {
    background: var(--color-surface-muted);
}

.app-topbar__user {
    align-items: center;
    display: flex;
    gap: var(--space-2);
}

.app-topbar__user span {
    align-items: center;
    background: var(--color-surface-muted);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    display: inline-flex;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    height: 2rem;
    justify-content: center;
    width: 2rem;
}

.app-breadcrumbs {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-5);
}

.app-breadcrumbs ol {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    list-style: none;
    margin: 0;
    padding: 0;
}

.app-breadcrumbs li {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.app-breadcrumbs li:not(:last-child)::after {
    content: "/";
    margin-left: var(--space-2);
}

.app-breadcrumbs a {
    color: var(--color-primary);
    text-decoration: none;
}

.app-page-header {
    align-items: flex-start;
    display: flex;
    gap: var(--space-4);
    justify-content: space-between;
}

.app-page-header h1 {
    font-size: var(--font-size-2xl);
    line-height: var(--line-height-tight);
    margin: 0;
}

.app-page-header p {
    color: var(--color-text-muted);
    margin: var(--space-2) 0 0;
}

.app-page-header__actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.app-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: grid;
}

.app-card__header,
.app-card__body,
.app-card__footer {
    padding: var(--space-4);
}

.app-card__header {
    border-bottom: 1px solid var(--color-border);
}

.app-card__footer {
    border-top: 1px solid var(--color-border);
}

.app-button {
    border: 1px solid transparent;
    font-weight: var(--font-weight-medium);
    justify-content: center;
    padding: 0 var(--space-4);
}

.app-button--primary {
    background: var(--color-primary);
    color: var(--color-surface);
}

.app-button--primary:hover {
    background: var(--color-primary-strong);
}

.app-button--secondary,
.app-button--tertiary {
    background: var(--color-surface);
    border-color: var(--color-border);
    color: var(--color-text);
}

.app-button--secondary:hover,
.app-button--tertiary:hover {
    background: var(--color-surface-muted);
}

.app-button--danger {
    background: var(--color-danger);
    color: var(--color-surface);
}

.app-search {
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    display: flex;
    gap: var(--space-2);
    min-height: 2.5rem;
    padding: 0 var(--space-3);
}

.app-search:focus-within {
    border-color: var(--color-focus-ring);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 20%, transparent);
}

.app-search input {
    background: transparent;
    border: 0;
    color: var(--color-text);
    min-width: 0;
    outline: 0;
    width: 100%;
}

.app-table {
    overflow-x: auto;
}

.app-table__toolbar {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3);
}

.app-table table {
    border-collapse: collapse;
    min-width: 42rem;
    width: 100%;
}

.app-table th,
.app-table td {
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-table);
    padding: var(--space-3) var(--space-4);
    text-align: left;
}

.app-table th {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-semibold);
}

.app-paged-table {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: grid;
    width: 100%;
}

.app-paged-table__toolbar,
.app-paged-table__footer {
    align-items: center;
    display: flex;
    gap: var(--space-3);
    justify-content: space-between;
    padding: var(--space-3);
}

.app-paged-table__toolbar {
    border-bottom: 1px solid var(--color-border);
}

.app-paged-table__footer {
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: calc(var(--font-size-sm) * .9);
}

.app-paged-table__quick-filter {
    flex: 1 1 18rem;
    max-width: 28rem;
}

.app-paged-table__actions,
.app-paged-table__pager,
.app-paged-table__pager label {
    align-items: center;
    display: flex;
    gap: var(--space-2);
}

.app-paged-table__pager {
    margin-left: auto;
}

.app-paged-table__pager select {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    min-height: 2rem;
    padding: 0 var(--space-2);
}

.app-paged-table__surface {
    overflow-x: auto;
}

.app-paged-table table {
    border-collapse: collapse;
    min-width: 48rem;
    width: 100%;
}

.app-paged-table th,
.app-paged-table td {
    border-bottom: 1px solid var(--color-border);
    font-size: calc(var(--font-size-sm) * .85);
    line-height: var(--line-height-table);
    padding: var(--space-2) var(--space-3);
    text-align: left;
    vertical-align: middle;
}

.app-paged-table th {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
}

.app-paged-table tbody tr:hover {
    background: var(--color-surface-muted);
}

.app-paged-table__select-cell {
    text-align: center;
    width: 2.75rem;
}

.app-paged-table__summary {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.app-table-sort {
    align-items: center;
    background: transparent;
    border: 0;
    color: inherit;
    display: inline-flex;
    font: inherit;
    font-weight: var(--font-weight-semibold);
    gap: var(--space-1);
    padding: 0;
}

.app-table-sort__indicator {
    color: var(--color-primary);
    font-size: var(--font-size-xs);
}

.app-state {
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-muted);
    display: grid;
    gap: var(--space-2);
    justify-items: center;
    padding: var(--space-8);
    text-align: center;
}

.app-state strong {
    color: var(--color-text);
    font-size: var(--font-size-lg);
}

.app-state p {
    margin: 0;
    max-width: 34rem;
}

.app-state--error .app-icon {
    color: var(--color-danger);
}

.app-state__spinner {
    animation: app-spin 800ms linear infinite;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    border-top-color: var(--color-primary);
    height: 2rem;
    width: 2rem;
}

@keyframes app-spin {
    to {
        transform: rotate(360deg);
    }
}

.app-dialog {
    inset: 0;
    position: fixed;
    z-index: var(--z-dialog);
}

.app-dialog__overlay {
    background: var(--color-overlay);
    inset: 0;
    position: absolute;
}

.app-dialog__surface {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-overlay);
    display: grid;
    left: 50%;
    max-width: min(34rem, calc(100vw - var(--space-6)));
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
}

.app-dialog__header,
.app-dialog__content,
.app-dialog__actions {
    padding: var(--space-4);
}

.app-dialog__header {
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
}

.app-dialog__header h2 {
    font-size: var(--font-size-xl);
    margin: 0;
}

.app-dialog__actions {
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--space-2);
    justify-content: flex-end;
}

.auth-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(20rem, 28rem);
    min-height: 100vh;
}

.auth-layout__brand,
.auth-layout__content {
    align-items: center;
    display: flex;
    padding: var(--space-8);
}

.auth-layout__brand {
    background: var(--color-surface-muted);
    gap: var(--space-4);
}

.auth-layout__content {
    background: var(--color-bg);
    justify-content: center;
}

.auth-layout__eyebrow {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

.auth-layout h1 {
    margin: var(--space-1) 0;
}

.auth-card__header {
    display: grid;
    gap: var(--space-1);
}

.auth-card__header h2 {
    font-size: var(--font-size-xl);
    margin: 0;
}

.auth-card__header p {
    color: var(--color-text-muted);
    margin: 0;
}

.auth-form,
.auth-field {
    display: grid;
    gap: var(--space-3);
}

.auth-field {
    gap: var(--space-2);
}

.auth-field span {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.auth-field input {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    min-height: 2.75rem;
    padding: 0 var(--space-3);
    width: 100%;
}

.auth-field input:focus {
    border-color: var(--color-focus-ring);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 20%, transparent);
    outline: 0;
}

.auth-form__validation,
.auth-form__error {
    border-radius: var(--radius-md);
    color: var(--color-danger);
    font-size: var(--font-size-sm);
}

.auth-form__validation {
    margin: 0;
    padding-left: var(--space-4);
}

.auth-form__error {
    align-items: center;
    background: color-mix(in srgb, var(--color-danger) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--color-danger) 35%, transparent);
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3);
}

.auth-form__spinner {
    animation: app-spin 800ms linear infinite;
    border: 2px solid color-mix(in srgb, var(--color-surface) 45%, transparent);
    border-radius: var(--radius-full);
    border-top-color: var(--color-surface);
    height: 1rem;
    width: 1rem;
}

@media (max-width: 1024px) {
    .app-shell,
    .app-shell--collapsed {
        grid-template-columns: minmax(0, 1fr);
    }

    .app-sidebar {
        bottom: 0;
        left: 0;
        max-width: 19rem;
        position: fixed;
        top: 0;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        width: min(19rem, 86vw);
    }

    .app-shell--mobile-open .app-sidebar {
        transform: translateX(0);
    }

    .app-shell--mobile-open .app-shell__overlay {
        background: var(--color-overlay);
        display: block;
        inset: 0;
        position: fixed;
        z-index: var(--z-overlay);
    }

    .app-topbar__menu {
        display: inline-flex;
    }
}

@media (max-width: 640px) {
    .app-shell__content,
    .app-topbar,
    .app-breadcrumbs {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }

    .app-page-header,
    .auth-layout {
        grid-template-columns: 1fr;
    }

    .app-page-header {
        display: grid;
    }

    .app-page-header__actions,
    .app-button {
        width: 100%;
    }

    .auth-layout__brand {
        display: none;
    }

    .app-topbar__user strong,
    .app-topbar__product small {
        display: none;
    }
}