I need a web application focused on event planning that looks and behaves flawlessly on smartphones while remaining fully usable from any desktop browser. The core of the site is a calendar where I can create and manage events directly: add titles, descriptions, locations, and durations, drag-and-drop them to new dates, and edit or delete them on the fly. Every activity must carry a priority flag decided by my own user-defined rules rather than a fixed “high / medium / low” scale. Think of a simple settings panel where I can write or select the rule, hit save, and immediately see the calendar reorder or recolor items to reflect that logic. Key requirements • Responsive layout that adapts smoothly from 4-inch screens up to large monitors • Event creation and management right inside the calendar view • Priority handling driven by user-defined rules, visually obvious at a glance (color, badge, or similar) • Clean UI/UX so tapping, scrolling, and long-press interactions feel natural on mobile • Lightweight admin area to modify rules and basic site settings without touching code Deliverables 1. Source code (front-end and back-end) in a standard Git repository 2. One-click deployment guide for a mainstream host (e.g., VPS, shared cPanel, or cloud platform) 3. Brief user manual that shows how to create events, set priorities, and adjust rules 4. Warranty period for bug fixes after hand-over Acceptance criteria: the calendar must load in under two seconds on 4G, event edits sync without page refresh, and priority changes propagate instantly across views. Future phases—such as RSVP tracking or automated notifications—might be added later, so designing with extensibility in mind is appreciated.