:root {
    --sidebar-expanded: 272px;
    --sidebar-collapsed: 76px;
    --t-fast: 150ms;
    --t-base: 250ms;
}

.sidebar {
    width: var(--sidebar-expanded);
    flex-shrink: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: width var(--t-base) cubic-bezier(.4, 0, .2, 1);
    z-index: 20;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar .label,
.sidebar .brand-text,
.sidebar .user-details,
.sidebar .user-chevron {
    transition: opacity var(--t-fast) ease;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .label,
.sidebar.collapsed .brand-text,
.sidebar.collapsed .user-details,
.sidebar.collapsed .user-chevron,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .chevron-icon {
    opacity: 0;
    width: 0;
    pointer-events: none;
}

.collapse-btn {
    position: absolute;
    top: 22px;
    right: -13px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    cursor: pointer;
    z-index: 30;
    color: var(--muted);
    box-shadow: var(--shadow);
    transition: background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}

.collapse-btn:hover {
    background: var(--surface-2);
    color: var(--text);
    box-shadow: var(--shadow-md);
}

.collapse-btn svg {
    width: 14px;
    height: 14px;
    transition: transform var(--t-base) cubic-bezier(.4, 0, .2, 1);
}

.sidebar.collapsed .collapse-btn svg {
    transform: rotate(180deg);
}

.brand {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 18px 18px 14px;
    text-decoration: none;
    color: var(--text);
    overflow: hidden;
}

.sidebar.collapsed .brand {
    justify-content: center;
    padding: 18px 0 14px;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    min-width: 0;
}

.brand-name {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-sub {
    font-size: 9.5px;
    color: var(--muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-top: 3px;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 0 16px;
    transition: margin var(--t-base) ease;
}

.sidebar.collapsed .divider {
    margin: 0 12px;
}

.nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px 12px 18px;
}

.sidebar.collapsed .nav {
    padding: 12px 10px 18px;
}

.sidebar-scroll::-webkit-scrollbar {
    width: 5px;
}

.sidebar-scroll::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 8px;
}

.sidebar-scroll {
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.nav-label {
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted-2);
    padding: 14px 12px 6px;
    font-weight: 700;
    transition: opacity var(--t-fast);
}

.home-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-2);
    text-decoration: none;
    transition: background var(--t-fast), color var(--t-fast);
    margin-bottom: 2px;
}

.home-link .mi-icon {
    width: 22px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    color: var(--muted);
}

.home-link .mi-icon svg {
    width: 18px;
    height: 18px;
}

.home-link .label {
    font-size: 13.5px;
    font-weight: 500;
}

.home-link:hover {
    background: var(--surface-2);
    color: var(--text);
}

.home-link.active {
    background: var(--accent-weak);
    color: var(--accent);
    font-weight: 600;
    box-shadow: inset 3px 0 0 var(--accent-bar);
}

.home-link.active .mi-icon {
    color: var(--accent);
}

.menu-group {
    position: relative;
    margin-bottom: 1px;
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    user-select: none;
    background: transparent;
    border: none;
    color: var(--text);
    font-family: inherit;
    transition: background var(--t-fast);
}

.accordion-header:hover {
    background: var(--surface-2);
}

.sidebar.collapsed .accordion-header {
    justify-content: center;
    padding: 10px 0;
}

.group-icon {
    width: 22px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
    color: var(--muted);
}

.group-icon svg {
    width: 18px;
    height: 18px;
}

.accordion-header .group-name {
    flex: 1;
    text-align: left;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-2);
}

.chevron-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    color: var(--muted-2);
    transition: transform var(--t-base) cubic-bezier(.4, 0, .2, 1);
}

.menu-group.open .chevron-icon {
    transform: rotate(180deg);
}

.menu-group.has-active-child .group-icon {
    color: var(--accent);
}

.sidebar.collapsed .menu-group.has-active-child .accordion-header {
    background: var(--accent-weak);
}

.accordion-content {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--t-base) cubic-bezier(.4, 0, .2, 1);
}

.menu-group.open .accordion-content {
    grid-template-rows: 1fr;
}

.sidebar.collapsed .accordion-content {
    grid-template-rows: 0fr !important;
}

.accordion-inner {
    overflow: hidden;
    min-height: 0;
}

.menu-items {
    padding: 2px 0 4px 33px;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.menu-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 12px;
    border-radius: 8px;
    font-size: 12.7px;
    color: var(--muted);
    cursor: pointer;
    text-decoration: none;
    transition: background var(--t-fast), color var(--t-fast);
}

.menu-item .mi-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--border);
    flex-shrink: 0;
    transition: background var(--t-fast);
}

.menu-item .label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.menu-item:hover {
    background: var(--surface-2);
    color: var(--text-2);
}

.menu-item.active {
    background: var(--accent-weak);
    color: var(--accent);
    font-weight: 600;
}

.menu-item.active .mi-dot {
    background: var(--accent);
}

.group-tooltip {
    position: absolute;
    left: calc(100% + 14px);
    top: 50%;
    transform: translateY(-50%) scale(.92);
    background: var(--text);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: all var(--t-fast) cubic-bezier(.4, 0, .2, 1);
    z-index: 50;
}

.group-tooltip::before {
    content: '';
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-right-color: var(--text);
}

.sidebar:not(.collapsed) .group-tooltip {
    display: none;
}

.sidebar.collapsed .accordion-header:hover .group-tooltip,
.sidebar.collapsed .home-link:hover .group-tooltip {
    opacity: 1;
    transform: translateY(-50%) scale(1);
}

.sidebar.collapsed .accordion-header.flyout-open .group-tooltip {
    opacity: 0 !important;
}

.flyout-menu {
    position: fixed;
    min-width: 210px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    padding: 6px;
    z-index: 100;
    opacity: 0;
    transform: translateX(-4px) scale(.97);
    pointer-events: none;
    transition: all var(--t-fast) cubic-bezier(.4, 0, .2, 1);
}

.flyout-menu.visible {
    opacity: 1;
    transform: translateX(0) scale(1);
    pointer-events: auto;
}

.flyout-title {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--muted-2);
    padding: 6px 10px 5px;
}

.flyout-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 10px;
    border-radius: 6px;
    font-size: 0.82rem;
    color: var(--muted);
    cursor: pointer;
    text-decoration: none;
    transition: background var(--t-fast), color var(--t-fast);
}

.flyout-item::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--border);
    flex-shrink: 0;
}

.flyout-item:hover {
    background: var(--surface-2);
    color: var(--text-2);
}

.flyout-item.active {
    background: var(--accent-weak);
    color: var(--accent);
    font-weight: 600;
}

.flyout-item.active::before {
    background: var(--accent);
}

.user-area {
    position: relative;
    margin-top: auto;
}

.user-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text);
    font-family: inherit;
    transition: background var(--t-fast);
}

.user-trigger:hover {
    background: var(--surface-2);
}

.sidebar.collapsed .user-trigger {
    justify-content: center;
    padding: 12px 0;
}

.avatar {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: var(--accent);
    flex-shrink: 0;
    display: grid;
    place-items: center;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
}

.user-details {
    flex: 1;
    min-width: 0;
    text-align: left;
    display: flex;
    flex-direction: column;
}

.user-details b {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-details span {
    font-size: 11px;
    color: var(--muted);
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-chevron {
    width: 16px;
    height: 16px;
    color: var(--muted);
    flex-shrink: 0;
}

.user-popup {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 12px;
    right: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    padding: 6px;
    z-index: 60;
    opacity: 0;
    transform: translateY(8px) scale(.97);
    pointer-events: none;
    transition: all var(--t-fast) cubic-bezier(.4, 0, .2, 1);
}

.user-popup.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.sidebar.collapsed .user-popup {
    left: 8px;
    right: auto;
    min-width: 190px;
}

.user-popup-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 8px 11px;
    border-radius: 7px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--muted);
    font-family: inherit;
    font-size: 0.85rem;
    text-align: left;
    transition: background var(--t-fast), color var(--t-fast);
}

.user-popup-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.user-popup-item:hover {
    background: var(--danger-weak);
    color: var(--danger);
}

@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 50;
        width: var(--sidebar-expanded);
        transform: translateX(-100%);
        transition: transform .25s cubic-bezier(.3, .8, .3, 1);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .sidebar.collapsed {
        width: var(--sidebar-expanded);
    }

    .collapse-btn {
        display: none;
    }
}