.topbar {
    height: 52px;
    background: var(--bg-dark);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 20;
}

.topbar .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    letter-spacing: 1px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--topbar-border-strong);
    background: var(--sidebar-item);
    color: var(--text-light);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
    background: var(--sidebar-item-active);
}

.theme-toggle:active {
    transform: scale(0.96);
}

.topbar a {
    color: var(--text-light);
    text-decoration: none;
}

.sidebar-toggle {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--topbar-border-weak);
    background: var(--sidebar-item);
    color: var(--text-light);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background 0.2s ease, transform 0.2s ease;
}

.sidebar-toggle:hover {
    background: var(--sidebar-item-active);
}

.sidebar-toggle:active {
    transform: scale(0.96);
}

.layout {
    display: flex;
    height: calc(100vh - 52px);
    min-height: calc(100vh - 52px);
    background: var(--bg-sidebar);
    position: relative;
}

.sidebar {
    width: 170px;
    background: var(--bg-sidebar);
    color: var(--text-light);
    padding: 16px 12px;
    border-right: 1px solid var(--border);
    min-height: calc(100vh - 52px);
    position: sticky;
    top: 52px;
    height: calc(100vh - 52px);
    transition: width 0.2s ease, padding 0.2s ease;
    align-self: stretch;
    overflow-y: auto;
}

.sidebar h3 {
    font-size: 12px;
    text-transform: uppercase;
    margin: 16px 0 8px;
    color: var(--text-muted);
    letter-spacing: 0.6px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li {
    margin-bottom: 4px;
}

.sidebar li a,
.menu-title {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.2s ease, color 0.2s ease;
}

.sidebar li a:hover,
.menu-title:hover {
    background: var(--sidebar-item);
}

.sidebar li a.active {
    background: var(--sidebar-item-active);
    border-left: 3px solid var(--accent);
    color: var(--text-light);
}

.menu-group {
    margin: 6px 0 10px;
}

.menu-group .submenu {
    margin: 6px 0 0 12px;
    padding-left: 10px;
    border-left: 1px dashed var(--sidebar-divider);
}

.menu-group .submenu a {
    font-size: 13px;
    color: var(--text-light);
}

.menu-group.open .submenu {
    display: block;
}

.menu-group .submenu {
    display: none;
}

.menu-title::after {
    content: "▸";
    margin-left: auto;
    font-size: 12px;
    color: var(--text-light);
    transition: transform 0.2s ease;
}

.menu-group.open .menu-title::after {
    transform: rotate(90deg);
}

body.sidebar-collapsed .sidebar {
    width: 64px;
    padding: 8px 6px;
}

body.sidebar-collapsed .sidebar li a,
body.sidebar-collapsed .menu-title {
    font-size: 0;
    padding: 8px 6px;
    justify-content: center;
}

body.sidebar-collapsed .sidebar li a::before,
body.sidebar-collapsed .menu-title::before {
    content: attr(data-icon);
    font-size: 16px;
    color: var(--text-light);
}

body.sidebar-collapsed .sidebar h3 {
    display: none;
}

body.sidebar-collapsed .menu-title::after {
    display: none;
}

body.sidebar-collapsed .menu-group .submenu {
    display: none !important;
}

.content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: var(--bg-light);
}

.sidebar-backdrop {
    position: fixed;
    inset: 52px 0 0 0;
    background: var(--overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 9;
}

body.sidebar-open .sidebar-backdrop {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 992px) {
    .layout {
        height: auto;
        min-height: calc(100vh - 52px);
        background: var(--bg-light);
    }

    .sidebar {
        position: fixed;
        top: 52px;
        left: 0;
        bottom: 0;
        width: 180px;
        height: calc(100vh - 52px);
        transform: translateX(-100%);
        transition: transform 0.25s ease, width 0.2s ease;
        z-index: 10;
        box-shadow: var(--shadow-sidebar);
    }

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

    .content {
        padding: 16px;
    }
}

@media (max-width: 640px) {
    .topbar {
        padding: 0 10px;
    }

    .topbar .logo {
        gap: 8px;
    }

    .topbar-actions {
        gap: 8px;
    }

    .content {
        padding: 12px;
    }
}

@media (max-width: 640px) {
    .topbar {
        padding: 0 12px;
    }

    .topbar .logo span {
        font-size: 13px;
        letter-spacing: 0.4px;
    }
}