I need a fully automated, formula-driven Gantt-style timeline in Excel to manage 14 concurrent projects running from Q1 2028 through Q4 2031. The sheet has to work as an everyday project-management tool, so every element—dates, bars, milestone markers—must update the moment I add or edit a row. Visuals and layout • The calendar axis should display in quarters. • Three milestones per project appear as distinct symbols, while a fourth milestone shows as a horizontal bar that spans the active phase or data-availability period. • A clean blue-gray palette, minimalist gridlines, and a vertical “Today” line make progress instantly readable in presentations or status meetings. Functionality requirements • No manual date math anywhere—everything pulls from start / end cells via formulas. • Inserting additional projects or milestones should extend the chart automatically without breaking references. • Project descriptions stay high-level; I will not track task-level subtasks here. Deliverables • A ready-to-use Excel file containing the timeline, milestone symbols, dynamic bar, and “Today” indicator. • Step-by-step instructions (inside the workbook or as a short PDF) that show how to add projects, update milestones, and tweak colors. • Optional: a matching PowerPoint slide that mirrors the Excel visuals for quick leadership briefings. If you are confident you can accomplish all of the above with clean formulas (no VBA required), let’s get started.