.sidebar {
        width: 248px;
        background: rgba(255,255,255,.86);
        border-right: 1px solid var(--line);
        padding: 22px 14px;
        display: flex;
        flex-direction: column;
        flex-shrink: 0;
        backdrop-filter: blur(18px);
        min-height: 0;
    }
    .sidebar h2 {
        padding: 0 10px 18px;
        font-size: 18px;
        line-height: 1.25;
        color: var(--text);
        font-weight: 750;
        border-bottom: 1px solid var(--line);
        margin-bottom: 14px;
    }
    .sidebar h2::after {
        content: "Personal OS";
        display: block;
        margin-top: 5px;
        font-size: 11px;
        color: var(--faint);
        letter-spacing: .04em;
        text-transform: uppercase;
    }
    .nav-item {
        padding: 11px 12px;
        margin: 3px 0;
        cursor: pointer;
        transition: .18s ease;
        color: var(--muted);
        display: flex;
        align-items: center;
        gap: 10px;
        border-radius: var(--radius);
        border: 1px solid transparent;
        font-weight: 650;
    }
    .nav-item:hover { background: var(--surface-soft); color: var(--text); }
    .nav-item.active {
        background: rgba(255,255,255,.68);
        color: var(--accent);
        border-color: transparent;
        box-shadow: inset 2px 0 0 rgba(33,110,78,.82);
    }
    .nav-item.active:hover { background: var(--accent-soft); }
    .nav-list {
        min-height: 0;
        overflow-y: auto;
        padding-right: 3px;
    }
    .sidebar-primary-action {
        margin-top: auto;
        padding-top: 18px;
        border-top: 1px solid var(--line);
    }
    .sidebar-primary-action .btn {
        width: 100%;

    .sidebar-bottom {
        margin-top: 10px;
        padding-top: 0;
        border-top: none;
        flex: 0 0 auto;
    }
    .sidebar-bottom summary {
        display: none;
        cursor: pointer;
        color: var(--muted);
        font-size: 12px;
        font-weight: 700;
        list-style: none;
    }
    .sidebar-bottom summary::-webkit-details-marker { display: none; }
    .sidebar-button-row {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        margin-top: 10px;
    }
    .sidebar-button-row .btn {
        width: 100%;
    }
    .sidebar-button-row-compact .btn {
        min-height: 34px;
        padding-inline: 10px;
    }
    }