DOWN?.

EXECUTIVE SUMMARY

Real-time, mobile-first group decision engine designed to eliminate the notorious 'kahit saan' deadlock in barkada hangouts. Built on Next.js 16 (App Router), React 19, Firebase Firestore, and Leaflet OpenStreetMap, Down? lets a room host pinpoint any meetup epicenter and radius across Metro Manila (or custom coordinates), spin up an ephemeral 6-character room, and invite friends via zero-install instant links. Participants swipe right (DOWN) or left (PASS) on venue cards with fluid Framer Motion physics, while a realtime consensus engine detects unanimous agreement and triggers an instant match celebration with live directions, distance calculations, and navigation dispatch.

SYSTEM HIGHLIGHTS

• 60-Second Barkada Consensus Engine: eliminates decision paralysis with frictionless mobile web swiping — no app downloads or account logins required
• Live Ephemeral Rooms with Custom Codes: hosts generate customizable rooms (food, cafes, nightlife, gaming, cinema) with interactive radius boundaries (1 km to 10 km)
• Interactive Geo-Spatial Radius Engine: Leaflet-powered location pinner with live Metro Manila quick-selects, address geocoding via Nominatim, and Overpass API POI filtering
• Gesture-Driven Tinder-Style Swiping: high-performance Framer Motion physics with drag thresholds, rotation spring kinematics, and velocity toss gestures
• Dual-Engine Real-Time Sync: primary Firebase Firestore snapshot listeners with Server-Sent Events (SSE) and in-memory room store fallback for zero-downtime voting states
• Instant Match Celebration Modal: real-time detection of unanimous approvals or ranked consensus with haptic-styled audio cues, route overlays, and Waze/Google Maps shortcuts
• High-Voltage Neo-Brutalist Design System: bold 3px-4px miter borders, deep 3D block shadows, high-voltage lime (#CCFF00) and hazard crimson (#FF1E44) palette, and Archivo Black typography
• Multi-Criteria Place Discovery: automatically curates top-rated spots with ratings, price tiers, categories, distance offsets, and OSM metadata
• Responsive PWA-Ready Mobile Web Architecture: optimized for mobile viewport constraints, safe-area-inset padding, and fluid dark/light mode transitions

CORE ARCHITECTURE

• Client Layer: Next.js 16 App Router + React 19 client components, dynamic Leaflet map loaders (SSR-disabled), Framer Motion swipe physics, and Lucide React iconography
• Real-Time Sync Engine: Firebase Firestore snapshot listeners and atomic batch transactions for room state, participant presence, and card upvote matrices
• Fallback SSE / In-Memory Store: Next.js route handlers supporting Server-Sent Events (/api/rooms/[code]/events) and action endpoints for local dev and edge runtimes
• Geo-Spatial Discovery Pipeline: Overpass API queries tagged with osm.ts filter matrices to fetch live POIs bounded by circular coordinate radiuses
• Consensus Resolver: calculates active voter intersections per card on every vote payload; dispatches MATCH_FOUND broadcast the moment consensus criteria are fulfilled

GALLERY & EVIDENCE FILES

■ DOWN? APP: NEO-BRUTALIST GROUP HANGOUT & MEETUP DECIDER WEB APP (DARK SHOWCASE EDITION)

■ DOWN? SIGNATURE WARM PAPER AESTHETIC & REAL-TIME DECK SHOWCASE

■ DOWN? MOBILE CARD SWIPING DECK & CONSENSUS MATCH PREVIEW