.app-shell {
    height: 100%;
    min-height: 100%;
    overflow: hidden;
}

.app-shell__frame {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    height: 100%;
    min-height: 0;
    overflow: hidden;
    transition: grid-template-columns var(--duration-slow) var(--ease-out);
}

.app-shell__frame.is-collapsed {
    grid-template-columns: var(--sidebar-width-collapsed) minmax(0, 1fr);
}

.app-shell__sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    padding: var(--space-4) var(--space-3);
    border-right: 1px solid var(--palette-accent-700);
    background: var(--sidebar-bg);
    height: 100%;
    min-height: 0;
    overflow: hidden;
}

.app-shell__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    min-height: 2.75rem;
}

.app-shell__brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: none;
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-sm);
    background: transparent;
}

.app-shell__brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.app-shell__brand-copy {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.app-shell__brand-name {
    font-size: var(--text-size-md);
    font-weight: var(--weight-semibold);
    color: var(--sidebar-text-strong);
    white-space: nowrap;
}

.app-shell__brand-meta {
    font-size: var(--text-size-xs);
    color: var(--brand-highlight);
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.app-shell__navigation {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
}

.app-shell__navigation-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.app-shell__navigation-label {
    font-size: var(--text-size-2xs);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--sidebar-text-dim);
    padding: 0 var(--space-2) var(--space-1);
    white-space: nowrap;
}

.app-shell__navigation-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.app-shell__navigation-item a {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-2);
    min-height: 2.25rem;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    font-size: var(--text-size-md);
    white-space: nowrap;
    transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.app-shell__navigation-item a::before {
    content: "";
    position: absolute;
    left: calc(var(--space-3) * -1);
    top: 50%;
    width: 2px;
    height: 0;
    border-radius: var(--radius-pill);
    background: var(--brand-highlight);
    transform: translateY(-50%);
    transition: height var(--duration-base) var(--ease-out);
}

.app-shell__navigation-item a:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-strong);
}

.app-shell__navigation-item a.is-active {
    background: var(--sidebar-active);
    color: var(--sidebar-text-strong);
    font-weight: var(--weight-medium);
}

.app-shell__navigation-item a.is-active::before {
    height: 1.125rem;
}

.app-shell__navigation-item .icon {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--sidebar-text-dim);
    transition: color var(--duration-fast) var(--ease-out), transform var(--duration-base) var(--ease-out);
}

.app-shell__navigation-item a:hover .icon {
    transform: scale(1.1);
    color: var(--sidebar-text-strong);
}

.app-shell__navigation-item a.is-active .icon {
    color: var(--brand-highlight);
}

.app-shell__subnav {
    margin: var(--space-1) 0 var(--space-2) var(--space-4);
    padding-left: var(--space-3);
    border-left: 1px solid var(--sidebar-border);
    animation: rise var(--duration-base) var(--ease-out) both;
}

.app-shell__subnav-context {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-size-2xs);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--brand-highlight);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.app-shell__subnav-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.app-shell__subnav-list a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-2);
    min-height: 1.75rem;
    border-radius: var(--radius-xs);
    color: var(--sidebar-text);
    font-size: var(--text-size-sm);
    white-space: nowrap;
    transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.app-shell__subnav-list a:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-strong);
}

.app-shell__subnav-list a.is-current {
    color: var(--brand-highlight);
}

.app-shell__subnav-list .icon {
    width: 0.875rem;
    height: 0.875rem;
    color: var(--sidebar-text-dim);
}

.app-shell__subnav-list a:hover .icon,
.app-shell__subnav-list a.is-current .icon {
    color: var(--brand-highlight);
}

.app-shell__navigation-count {
    margin-left: auto;
    padding: 1px var(--space-2);
    border: 1px solid var(--sidebar-border);
    border-radius: var(--radius-pill);
    font-size: var(--text-size-2xs);
    font-variant-numeric: tabular-nums;
    color: var(--sidebar-text);
    background: rgba(255, 255, 255, 0.06);
}

.app-shell__sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-top: var(--space-3);
    border-top: 1px solid var(--sidebar-border);
}

.app-shell__frame.is-collapsed .app-shell__brand-copy,
.app-shell__frame.is-collapsed .app-shell__navigation-label,
.app-shell__frame.is-collapsed .app-shell__navigation-item span,
.app-shell__frame.is-collapsed .app-shell__navigation-count,
.app-shell__frame.is-collapsed .app-shell__subnav {
    display: none;
}

.app-shell__frame.is-collapsed .app-shell__navigation-item a {
    justify-content: center;
    padding-inline: 0;
}

.app-shell__main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    height: 100%;
    overflow: hidden;
}

.app-shell__topbar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex: none;
    height: var(--topbar-height);
    padding: 0 var(--space-6);
    border-bottom: 1px solid var(--border-subtle);
    background: color-mix(in srgb, var(--surface-raised) 82%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    z-index: var(--layer-topbar);
}

.app-shell__breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-width: 0;
    font-size: var(--text-size-sm);
    color: var(--text-muted);
}

.app-shell__breadcrumb .icon {
    width: 0.875rem;
    height: 0.875rem;
    color: var(--text-disabled);
}

.app-shell__breadcrumb-current {
    color: var(--text-primary);
    font-weight: var(--weight-medium);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.app-shell__icon-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    background: transparent;
    transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}

.app-shell__icon-action:hover {
    background: var(--surface-hover);
    border-color: var(--border-subtle);
    color: var(--text-primary);
}

.app-shell__icon-action:active {
    transform: scale(0.94);
}

.app-shell__icon-action .icon {
    width: 1.0625rem;
    height: 1.0625rem;
}

.app-shell__notification {
    position: relative;
}

.app-shell__notification summary {
    position: relative;
    list-style: none;
}

.app-shell__notification summary::-webkit-details-marker {
    display: none;
}

.app-shell__notification-dot {
    position: absolute;
    top: 0.35rem;
    right: 0.35rem;
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 999px;
    background: var(--fill-caution);
    box-shadow: 0 0 0 2px var(--surface-raised);
}

.app-shell__notification-panel {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    z-index: 40;
    width: min(22rem, calc(100vw - 2rem));
    padding: var(--space-4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background: var(--surface-raised);
    box-shadow: var(--shadow-lg);
}

.app-shell__notification-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.app-shell__notification-header-actions {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.app-shell__notification-title,
.app-shell__notification-copy {
    margin: 0;
}

.app-shell__notification-title {
    font-size: var(--text-size-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
}

.app-shell__notification-link {
    font-size: var(--text-size-xs);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    text-decoration: none;
}

.app-shell__notification-link:hover {
    color: var(--text-primary);
}

.app-shell__notification-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
}

.app-shell__notification-close:hover {
    border-color: var(--border-subtle);
    background: var(--surface-sunken);
    color: var(--text-primary);
}

.app-shell__notification-close .icon {
    width: 0.95rem;
    height: 0.95rem;
}

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

.notification-list {
    display: grid;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
}

.notification-item {
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: var(--surface-sunken);
}

.notification-item--danger {
    border-color: var(--border-caution);
}

.notification-item--warn {
    border-color: var(--border-caution);
}

.notification-item--positive {
    border-color: var(--border-positive);
}

.notification-item__link,
.notification-item__body {
    display: grid;
    gap: 0.15rem;
    padding: var(--space-3);
    text-decoration: none;
    color: inherit;
}

.notification-item__link:hover {
    background: color-mix(in srgb, var(--surface-raised) 70%, transparent);
}

.notification-item__title {
    font-size: var(--text-size-sm);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
}

.notification-item__detail {
    font-size: var(--text-size-xs);
    color: var(--text-muted);
}

.app-shell__divider {
    width: 1px;
    height: 1.25rem;
    background: var(--border-subtle);
    margin: 0 var(--space-1);
}

.app-shell__avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-pill);
    background: var(--palette-accent-600);
    border: 1px solid var(--palette-accent-600);
    font-size: var(--text-size-xs);
    font-weight: var(--weight-semibold);
    color: var(--brand-highlight);
}

.app-shell__logout {
    display: flex;
}

.app-shell__content {
    flex: 1 1 auto;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    padding: var(--space-6);
    width: 100%;
    max-width: var(--content-max);
    margin: 0 auto;
    animation: rise var(--duration-slow) var(--ease-out) both;
}

.auth-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background:
        radial-gradient(circle at 50% -10%, var(--palette-accent-500), transparent 65%),
        var(--palette-accent-600);
}

.auth-shell__content {
    width: min(100%, 30rem);
    animation: rise var(--duration-slower) var(--ease-out) both;
}

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

    .app-shell__brand-copy,
    .app-shell__navigation-label,
    .app-shell__navigation-item span,
    .app-shell__navigation-count {
        display: none;
    }

    .app-shell__navigation-item a {
        justify-content: center;
        padding-inline: 0;
    }

}

@media (max-width: 720px) {
    .app-shell__topbar {
        padding: 0 var(--space-4);
    }

    .app-shell__content {
        padding: var(--space-4);
    }

    .app-shell__breadcrumb-parent,
    .app-shell__breadcrumb .icon {
        display: none;
    }
}