Solution explanation

In the styles.css file, you’ll find the following:

Lines 1–4: The .dashboard-container uses a single-column grid by default, stacking sidebar and main content vertically.
Lines 6–17: The .sidebar is hidden initially, styled with a dark background and light text. The .label inside the sidebar is hidden (display: none).
Lines 19–23: The .main-content is a vertical flex container with padding.
Lines 25–36: The .filter-panel is collapsed by default (height: 0; overflow: hidden; transition), expanding on :focus-within or :hover.
Lines 38–53: The .filter-toggle is hidden by default and styled as a fixed circular button, to be shown only on mobile.
Lines 55–71: The .widgets grid defaults to a single column with gaps. Individual .widget-detail elements are hidden (display: none), while .widget-summary is always visible.
Lines 74–105: In @media (max-width: 479px) (mobile): hide .sidebar; show .filter-toggle fixed at bottom-right; position .filter-panel as a fixed overlay (top: 10%; left: 5%; width: 90%) and height transitions to 80vh on hover/focus. The .widgets grid remains single-column, only .widget-summary is shown.
Lines 108–134: In @media (min-width: 480px) and (max-width: 767px) (small tablet): hide .sidebar; hide .filter-toggle; display .filter-panel inline but collapsed (height: 0) and expands on hover/focus to 200px. The .widgets grid stays single-column: show .widget-summary and .widget-detail.detail-1, hide others.
Lines 137–172: In @media (min-width: 768px) and (max-width: 1023px) (large tablet): change .dashboard-container to two columns (60px 1fr), show .sidebar collapsed (width: 60px; .label { display: none; }), hide .filter-toggle. Display .filter-panel inline, collapsed by default, and expand automatically when viewport width reaches ≥ 992px via nested @media. The .widgets grid becomes two columns (repeat(2, 1fr)): show .widget-summary, .widget-detail.detail-1, and .widget-detail.detail-2; hide .widget-detail.detail-3.
Lines 175–208: In @media (min-width: 1024px) (desktop): expand .dashboard-container to two columns (200px 1fr), show .sidebar fully (width: 200px; .label { display: inline-block; }), hide .filter-toggle. Display .filter-panel fully expanded. The .widgets grid becomes three columns with two rows: .widget-summary spans the first column across two rows; .detail-1, .detail-2, and .detail-3 fill the remaining cells. All .widget-detail elements are visible.

Solution: Adaptive Dashboard Widget and Filter Panel Visibility

Solution: Adaptive Dashboard Widget and Filter Panel Visibility