.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
    position: relative;
}

.sidebar {
    position: sticky;
    top: 0;
    display: grid;
    align-content: start;
    gap: var(--space-6);
    height: 100vh;
    padding: var(--space-6);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 247, 249, 0.98));
    color: var(--color-text);
    border-right: 1px solid var(--color-border);
    width: var(--sidebar-width);
    transition: width 180ms ease, transform 180ms ease, opacity 180ms ease;
    z-index: 30;
}

.sidebar-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.brand {
    display: grid;
    gap: var(--space-2);
    min-width: 0;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #1b1c21, #3d4048);
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    box-shadow: var(--shadow-sm);
}

.brand small {
    color: var(--color-text-soft);
}

.sidebar-toggle-desktop,
.sidebar-toggle-mobile {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: linear-gradient(180deg, #fff, #f7f7f8);
    color: var(--color-text-muted);
    flex: 0 0 auto;
}

.sidebar-toggle-mobile {
    display: none;
}

.sidebar-link-label,
.brand-copy,
.sidebar-note {
    transition: opacity 140ms ease;
}

.sidebar-footer {
    margin-top: auto;
}

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

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-weight: 700;
}

.sidebar-link i {
    width: 16px;
    text-align: center;
}

.sidebar-link.is-active,
.sidebar-link:hover {
    background: var(--color-primary-soft);
    border-color: rgba(20, 115, 230, 0.16);
    color: var(--color-primary-strong);
}

.sidebar-section {
    display: grid;
    gap: var(--space-3);
}

.sidebar-dropdown {
    display: grid;
    gap: 6px;
}

.sidebar-dropdown .dropdown-toggle {
    justify-content: flex-start;
    width: 100%;
}

.sidebar-dropdown .dropdown-toggle::after {
    margin-left: auto;
    border-top: 0.35em solid currentColor;
    border-right: 0.35em solid transparent;
    border-left: 0.35em solid transparent;
    content: "";
    transition: transform 120ms ease;
}

.sidebar-dropdown .dropdown-toggle[aria-expanded="true"]::after {
    transform: rotate(180deg);
}

.sidebar-dropdown .dropdown-menu {
    display: none;
    position: static;
    float: none;
    min-width: 0;
    margin: 0;
    padding: 6px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: linear-gradient(180deg, #fff, #f8f8fa);
    box-shadow: none;
}

.sidebar-dropdown .dropdown-menu.show {
    display: grid;
    gap: 4px;
}

.sidebar-dropdown .dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 36px;
    padding: 0 10px 0 12px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-weight: 700;
}

.sidebar-dropdown .dropdown-item i {
    width: 16px;
    text-align: center;
}

.sidebar-dropdown .dropdown-item.is-active,
.sidebar-dropdown .dropdown-item:hover {
    background: var(--color-primary-soft);
    border-color: rgba(20, 115, 230, 0.16);
    color: var(--color-primary-strong);
}

.sidebar-note {
    padding: var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #fff, #f8f8fa);
}

.main-shell {
    min-width: 0;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    min-height: var(--topbar-height);
    padding: 16px var(--space-6);
    background: rgba(245, 245, 247, 0.92);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
}

.topbar-search {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: min(480px, 100%);
    padding: 0 14px;
    min-height: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.92);
}

.topbar-search input {
    width: 100%;
    border: 0;
    outline: 0;
    background: transparent;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.topbar-start {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
    flex: 1 1 auto;
}

.user-badge {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 40px;
    padding: 0 12px 0 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.98);
    cursor: pointer;
    user-select: none;
}

.user-badge .stack-sm {
    gap: 0;
}

.user-badge-caret {
    font-size: .65rem;
    color: var(--color-muted);
    transition: transform .15s ease;
}

.user-badge.is-open .user-badge-caret {
    transform: rotate(180deg);
}

.user-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 160px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 12px rgba(0,0,0,.08);
    z-index: 200;
    overflow: hidden;
}

.user-badge.is-open .user-dropdown-menu {
    display: block;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    font-size: .85rem;
    color: var(--color-text);
    text-decoration: none;
}

.user-dropdown-item:hover {
    background: var(--color-bg-subtle, #f5f5f5);
}

.user-dropdown-item i {
    width: 14px;
    text-align: center;
    color: var(--color-muted);
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 999px;
    background: linear-gradient(135deg, #1473e6, #0d66d0);
}

.content {
    width: 100%;
    max-width: none;
    padding: var(--space-6) var(--space-6) var(--space-10);
    margin: 0 auto;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-6);
}

.page-header-copy {
    display: grid;
    gap: var(--space-3);
    max-width: 860px;
}

.page-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.content-grid-2 {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: var(--space-6);
}

.content-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
}

.content-grid-sidebar {
    display: grid;
    grid-template-columns: 1.75fr 1fr;
    gap: var(--space-6);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(24, 25, 28, 0.38);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
    z-index: 20;
}

body.is-sidebar-open .sidebar-overlay {
    opacity: 1;
    pointer-events: auto;
}

body.is-sidebar-collapsed .app-shell {
    grid-template-columns: 88px 1fr;
}

body.is-sidebar-collapsed .sidebar {
    width: 88px;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
    justify-content: center;
}

body.is-sidebar-collapsed .sidebar-header {
    display: grid;
    justify-items: center;
}

body.is-sidebar-collapsed .brand {
    justify-items: center;
}

body.is-sidebar-collapsed .brand-copy,
body.is-sidebar-collapsed .sidebar-note,
body.is-sidebar-collapsed .sidebar .eyebrow,
body.is-sidebar-collapsed .sidebar-link-label {
    opacity: 0;
    width: 0;
    overflow: hidden;
    pointer-events: none;
}

body.is-sidebar-collapsed .sidebar-nav {
    justify-items: center;
}

body.is-sidebar-collapsed .sidebar-link {
    width: 40px;
    height: 40px;
    min-height: 40px;
    justify-content: center;
    justify-self: center;
    margin-inline: auto;
    padding: 0;
    gap: 0;
}

body.is-sidebar-collapsed .sidebar-dropdown {
    display: none;
}

body.is-sidebar-collapsed .sidebar-footer {
    display: grid;
    justify-items: center;
}

@media (max-width: 1240px) {
    .kpi-grid,
    .content-grid-3,
    .content-grid-2,
    .content-grid-sidebar,
    .detail-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .content {
        width: 100%;
    }

    .kpi-grid,
    .content-grid-3,
    .content-grid-2,
    .content-grid-sidebar,
    .detail-grid,
    .page-header {
        grid-template-columns: 1fr;
        display: grid;
    }

    .topbar {
        flex-direction: column;
        align-items: stretch;
    }

    .topbar-start {
        width: 100%;
    }

    .sidebar-toggle-mobile {
        display: inline-flex;
    }

    .sidebar-toggle-desktop {
        display: none;
    }

    body.is-sidebar-open .sidebar {
        transform: translateX(0);
    }

    body.is-sidebar-collapsed .app-shell {
        grid-template-columns: 1fr;
    }

    body.is-sidebar-collapsed .sidebar {
        width: var(--sidebar-width);
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }

    body.is-sidebar-collapsed .sidebar-header {
        display: flex;
        justify-content: space-between;
    }

    body.is-sidebar-collapsed .brand {
        justify-items: start;
    }

    body.is-sidebar-collapsed .brand-copy,
    body.is-sidebar-collapsed .sidebar-note,
    body.is-sidebar-collapsed .sidebar-link-label {
        opacity: 1;
        width: auto;
        overflow: visible;
        pointer-events: auto;
    }

    body.is-sidebar-collapsed .sidebar-link {
        width: auto;
        justify-content: flex-start;
        padding: 0 14px;
    }

    body.is-sidebar-collapsed .sidebar-dropdown {
        display: grid;
    }
}