System Requirements Document for travel-planning-trip

1. Introduction

travel-planning-trip is a smart, user-friendly Travel Planning App that helps a traveler plan, manage, and personalize an entire trip from start to finish. The product intent is a single place where a traveler moves from an initial idea (a destination and some dates) through a coherent, adjustable plan — day-by-day itinerary, budget and expenses, time-management guidance, places to visit, local transportation, outfit and dress recommendations, and a personalized packing checklist — and then, during and after travel, tracks the trip and captures photos, notes, and memorable moments organized by destination or trip.

The audience is independent, style-conscious travelers who plan trips on their phones and want the planning itself to feel like part of the holiday. The product is a lifestyle product with real utility underneath: budgets, checklists, transit routes, and day-by-day itineraries must stay legible even while the visual language stays loud and saturated.

The app is delivered as a first-party custom web application with application-owned identity: travelers enroll themselves, verify on return, and their trips, itineraries, expenses, and memories remain bound to them across sessions.

2. System Overview

The current release delivers the complete accepted planning lifecycle for three accepted traveler roles:

• Trip Planner — owns the end-to-end planning workflow: creates and manages trips with destination, dates, and travel details; browses destination recommendations shaped by stated preferences; builds and rearranges a day-by-day itinerary; estimates and tracks a budget across expense categories; reviews time-management suggestions; views outfit recommendations; and generates a personalized packing checklist.
• In-Trip Traveler — executes and adapts the plan in real time: tracks the trip before and during travel, updates or changes plans on the fly, consults local transportation options and guidance for traveling between destinations, and follows time-management suggestions to make the most of each day.
• Memory Keeper — captures and organizes travel memories by adding photos, notes, and memorable moments and organizing them by destination or trip.

Delivery and ownership. All accepted human-facing behavior is delivered on first-party custom pages owned by the application. Identity is application-owned: anonymous visitors can read the Landing page and establish identity through Sign Up or Login; every planning, tracking, recommendation, itinerary, budget, expense, time, memory, place, transport, outfit, and packing destination requires a verified traveler session so that durable trip state stays bound to the correct traveler. Recommendation, place, transport, and outfit content is presented by the application; where the application draws on external travel data, that data is consumed by the application and surfaced on first-party pages rather than handed off to a provider-owned surface.

Narrow exclusions. This document does not add booking or payment of flights, hotels, or tickets; social sharing or collaboration between multiple travelers on one trip; real-time GPS navigation; or any account-management capability beyond self-service enrollment and returning verification. Nothing in the accepted requirements prohibits these in a future horizon, but none is current scope.

2a. Product Interpretation and Delivery Boundary

The accepted requirement thread describes one traveler working through a trip from idea to memory. That work is delivered entirely inside this application. A traveler arrives anonymously at the Landing page, learns what the product does, and either starts a trip (which requires establishing identity) or signs in to continue an existing trip. From that point every destination is a first-party page reachable only with a verified session, because trips, itineraries, budgets, expenses, and memories are durable records that must remain attached to the traveler who created them.

Recommendations, place information, local transportation options, and outfit suggestions are produced by the application from the traveler's destination, dates, stated preferences, weather, planned activities, and local culture. The application is the surface where these are browsed, compared, and acted on; no accepted requirement hands the traveler off to a provider-owned screen for planning work.

The current horizon covers planning before travel, tracking and adaptation during travel, and memory capture during and after travel. Future horizons — booking, multi-traveler collaboration, live navigation — are explicitly out of current scope and are not represented by any current page or requirement.

2b. Source Content Inventory

No reference directive in this project declares content_source authority, so no source content inventory is included. All factual content in this document derives from the authoritative user requirement thread and the accepted Planning Scope.

2c. Page Content and Component Coverage

The page inventory below is the closed, ordered page contract for this release. Each page appears exactly once.

Landing

• Information and state: Anonymous public entry. Presents the product identity and the scope of trip planning it covers — trip tracking and management, travel ideas and recommendations, flexible day-by-day planning, budget and time management, travel memories, places to visit, local transportation, outfit and dress recommendations, and packing. No traveler-specific data is shown.
• Primary action: "Start a trip" — the single primary call to action, which begins the identity-establishment path for a traveler who is not yet verified.
• Supporting actions: Navigate to Sign Up; navigate to Login for a traveler who already has an account.
• Domain entities: None owned here; the page describes the product, not traveler records.
• Component responsibilities: Oversized stacked wordmark; a saturated colour field carrying the primary action; a destination-name ticker along the bottom edge; entry links to Sign Up and Login.
• States: Loading — static content, no data fetch required. Empty — not applicable. Success — page renders with the primary action reachable. Error — if the identity service is unreachable, the primary action surfaces an inline message that enrollment is temporarily unavailable and offers retry. Recovery — retry re-attempts the identity path without losing the visitor's place.

Sign Up

• Information and state: Anonymous self-service enrollment. Collects the minimum credentials needed to establish a traveler identity and explains that trips, itineraries, budgets, and memories will be saved to that identity.
• Primary action: Create the traveler account and enter the application as a verified traveler.
• Supporting actions: Navigate to Login if the visitor already has an account; return to Landing.
• Domain entities: Traveler identity (credentials and the durable owner key that trips, itineraries, expenses, and memories attach to).
• Component responsibilities: Credential entry fields; inline validation messaging; submit control; link to Login.
• States: Loading — submit control shows an in-progress state while the account is created. Empty — initial blank form. Success — traveler is verified and lands on Trips with an empty-state prompt to create the first trip. Error — invalid or already-used credentials produce field-level messages and the form retains entered values. Recovery — the traveler corrects the field and resubmits, or switches to Login.

Login

• Information and state: Anonymous returning verification. Collects credentials for an existing traveler identity.
• Primary action: Verify the traveler and restore their session.
• Supporting actions: Navigate to Sign Up; return to Landing.
• Domain entities: Traveler identity.
• Component responsibilities: Credential entry fields; inline validation messaging; submit control; link to Sign Up.
• States: Loading — submit control shows an in-progress state during verification. Empty — initial blank form. Success — traveler is verified and lands on Trips with their existing trips listed. Error — incorrect credentials produce a non-revealing error message and the form retains the entered identifier. Recovery — retry, or switch to Sign Up.

Trips

• Information and state: The verified traveler's trip collection — each trip showing destination, dates, and travel details, with its current tracking status (upcoming, in progress, or past).
• Primary action: Open a trip to its Trip Details.
• Supporting actions: Start a New Trip; open Trip Tracking for a trip; filter or sort the collection by status or date.
• Domain entities: Trip (destination, start date, end date, travel details, status).
• Component responsibilities: Trip list or grid with per-trip summary; status indicator; create-trip entry point; empty-state prompt.
• States: Loading — skeleton placeholders for trip summaries. Empty — no trips yet, with a prompt to create the first trip. Success — trips listed with destination, dates, and status. Error — collection fails to load; an inline message offers retry. Recovery — retry reloads the collection; the traveler can still start a New Trip.

New Trip

• Information and state: Trip creation form capturing destination, dates, and travel details.
• Primary action: Save the trip, creating a durable trip record owned by the verified traveler.
• Supporting actions: Cancel and return to Trips; adjust dates before saving.
• Domain entities: Trip (destination, start date, end date, travel details).
• Component responsibilities: Destination input; date range selection; travel-details fields; validation messaging; save and cancel controls.
• States: Loading — save control shows an in-progress state while the trip is written. Empty — initial blank form. Success — trip is created and the traveler lands on Trip Details for the new trip. Error — missing or invalid destination or dates produce field-level messages and entered values are retained. Recovery — correct the fields and resave, or cancel without creating a trip.

Trip Details

• Information and state: The durable plan for one trip — destination, dates, travel details, and the traveler's current plan state, with entry points into the trip's itinerary, budget, expenses, time planning, memories, places, transport, outfits, and packing.
• Primary action: Update or change the trip's plans (destination, dates, or travel details) and save.
• Supporting actions: Open Itinerary, Budget, Expenses, Time Planner, Memories, Places, Transport, Outfits, or Packing for this trip; open Trip Tracking; delete the trip.
• Domain entities: Trip; links to the trip's itinerary, budget, expenses, time suggestions, memories, and packing checklist.
• Component responsibilities: Trip summary header; editable trip fields; module entry points; save and delete controls.
• States: Loading — trip summary and module entry points load with placeholders. Empty — a trip with no itinerary, expenses, or memories yet shows prompts to start each. Success — updated trip details are saved and reflected immediately. Error — save failure surfaces an inline message and preserves unsaved edits. Recovery — retry the save; edits are not lost.

Trip Tracking

• Information and state: The trip's tracking view before and during travel — current status, dates, destination, and the traveler's plan state for the trip.
• Primary action: Update the trip's status or plan state as travel progresses.
• Supporting actions: Jump to Itinerary, Transport, Route Guide, or Time Planner for the trip.
• Domain entities: Trip status; trip plan state.
• Component responsibilities: Status display and control; trip summary; links into the trip's execution-time modules.
• States: Loading — status and summary load with placeholders. Empty — a trip with no status set yet prompts the traveler to set it. Success — status change is saved and reflected immediately. Error — status update fails; an inline message offers retry and the previous status remains shown. Recovery — retry the update.

Recommendations

• Information and state: Destination-based suggestions for places to visit, activities, attractions, restaurants, and experiences, shaped by the traveler's stated preferences and the trip's destination.
• Primary action: Open a recommended item to act on it (view its place information or add it to the trip's itinerary).
• Supporting actions: Adjust which preference dimensions shape the list; open Preferences; open Places or Place Details for a recommended place.
• Domain entities: Recommendation item (type, name, destination, short description); traveler preferences.
• Component responsibilities: Recommendation list grouped by type; preference summary; entry to Preferences; per-item action to add to itinerary.
• States: Loading — recommendation placeholders while the list is assembled. Empty — no recommendations for the destination yet, with a prompt to refine preferences. Success — recommendations listed and shaped by the traveler's preferences. Error — recommendations fail to load; an inline message offers retry. Recovery — retry, or open Preferences to change the inputs and reload.

Preferences

• Information and state: The traveler's stated preferences that shape recommendations — the inputs the recommendation engine reads for a destination.
• Primary action: Save preference changes.
• Supporting actions: Return to Recommendations to see the effect; clear a preference.
• Domain entities: Traveler preferences.
• Component responsibilities: Preference controls; save control; link back to Recommendations.
• States: Loading — existing preferences load with placeholders. Empty — no preferences set yet, with a prompt to add some. Success — preferences saved and applied to subsequent recommendations. Error — save failure surfaces an inline message and preserves unsaved changes. Recovery — retry the save.

Itinerary

• Information and state: The trip's day-by-day itinerary — activities assigned to each day of the trip, with the trip's dates as the day frame.
• Primary action: Add an activity to a day.
• Supporting actions: Rearrange activities within and across days; remove an activity; change an activity's details; open Recommendations or Places to source new activities.
• Domain entities: Itinerary day; itinerary activity (name, day, time or ordering, notes).
• Component responsibilities: Day-by-day layout; draggable activity items with a visible grip; add, edit, and remove controls; entry to Recommendations and Places.
• States: Loading — day frame and activity placeholders. Empty — a trip with no activities yet, with a prompt to add the first activity or browse Recommendations. Success — additions, rearrangements, edits, and removals are saved and reflected immediately. Error — a save or reorder fails; an inline message offers retry and the previous arrangement is restored. Recovery — retry the operation; the traveler can also re-drag the item.

Budget

• Information and state: The trip's estimated and tracked travel budget — the overall budget figure and the traveler's progress against it.
• Primary action: Set or update the trip's budget estimate.
• Supporting actions: Open Expenses to record or review the expenses that count against the budget; adjust the estimate.
• Domain entities: Trip budget (estimate, tracked total, remaining).
• Component responsibilities: Budget figure display; estimate control; progress against budget; entry to Expenses.
• States: Loading — budget figures load with placeholders. Empty — no budget set yet, with a prompt to set an estimate. Success — estimate saved and tracked total reflected. Error — save failure surfaces an inline message and preserves the entered value. Recovery — retry the save.

Expenses

• Information and state: The trip's recorded expenses organized by travel category — transportation, accommodation, food, shopping, and activities.
• Primary action: Record an expense with its category and amount.
• Supporting actions: Edit or remove a recorded expense; change an expense's category; review category totals against the trip budget.
• Domain entities: Expense (category, amount, date, note); expense category (transportation, accommodation, food, shopping, activities).
• Component responsibilities: Expense entry form; category selection; expense list grouped by category; category totals; link to Budget.
• States: Loading — expense list and totals load with placeholders. Empty — no expenses recorded yet, with a prompt to record the first. Success — expense saved and category totals and budget progress updated. Error — save failure surfaces an inline message and preserves the entered expense. Recovery — retry the save; the traveler can also edit the entry.

Time Planner

• Information and state: Time-management suggestions for the trip so the traveler can make the most of it — guidance derived from the trip's dates and planned activities.
• Primary action: Apply a suggestion to the trip's plan (for example, adjust the day's activity ordering in the itinerary).
• Supporting actions: Open Itinerary to act on a suggestion; open Trip Tracking during travel.
• Domain entities: Time-management suggestion (day, guidance, related activities).
• Component responsibilities: Suggestion list by day; per-suggestion action linking into the itinerary; trip context header.
• States: Loading — suggestions load with placeholders. Empty — no suggestions yet because the itinerary has no activities, with a prompt to build the itinerary first. Success — suggestions listed for the trip's days. Error — suggestions fail to load; an inline message offers retry. Recovery — retry, or open Itinerary to add activities and return.

Memories

• Information and state: Capture surface for a trip's memories — photos, notes, and memorable moments attached to the trip.
• Primary action: Add a memory (photo, note, or moment) to the trip.
• Supporting actions: Edit or remove a memory; open Memory Library to browse memories organized by destination or trip.
• Domain entities: Memory (photo, note, moment, trip, destination, date).
• Component responsibilities: Add-memory form with photo and note entry; memory list for the trip; link to Memory Library.
• States: Loading — existing memories for the trip load with placeholders. Empty — no memories yet for this trip, with a prompt to add the first. Success — memory saved and shown in the trip's memory list. Error — upload or save failure surfaces an inline message and preserves the entered note. Recovery — retry the upload or save.

Memory Library

• Information and state: The traveler's memories organized by destination or trip.
• Primary action: Open a memory or a grouping to view it in full.
• Supporting actions: Switch grouping between destination and trip; open Memories to add a new memory to a trip.
• Domain entities: Memory; grouping by destination; grouping by trip.
• Component responsibilities: Grouping control (destination or trip); grouped memory display; per-memory detail view; entry to Memories.
• States: Loading — groupings and memory thumbnails load with placeholders. Empty — no memories yet, with a prompt to add the first from a trip. Success — memories grouped and browsable by destination or trip. Error — library fails to load; an inline message offers retry. Recovery — retry, or open a trip's Memories page directly.

Places

• Information and state: Places to visit for the traveler's destination — popular attractions, hidden gems, landmarks, and must-visit locations.
• Primary action: Open a place to its Place Details.
• Supporting actions: Filter or browse by place type; add a place to the trip's itinerary.
• Domain entities: Place (name, type, destination, short description).
• Component responsibilities: Place list with distinct card treatment per place type; type filters; entry to Place Details; add-to-itinerary action.
• States: Loading — place cards load with placeholders. Empty — no places available for the destination yet, with a prompt to change destination or refine preferences. Success — places listed by type. Error — places fail to load; an inline message offers retry. Recovery — retry, or open Recommendations for the destination.

Place Details

• Information and state: Useful information about a selected place — what it is, where it is, and what the traveler needs to know to visit it.
• Primary action: Add the place to the trip's itinerary.
• Supporting actions: Return to Places; open Transport or Route Guide to plan how to get there.
• Domain entities: Place (name, type, destination, description, useful visiting information).
• Component responsibilities: Place header and description; useful information block; add-to-itinerary control; links to Transport and Route Guide.
• States: Loading — place information loads with placeholders. Empty — not applicable; a place is always selected to reach this page. Success — place information shown and add-to-itinerary available. Error — place information fails to load; an inline message offers retry and a link back to Places. Recovery — retry, or return to Places and select another place.

Transport

• Information and state: The destination city's transportation system and available options — buses, trains, metro, taxis, and walking routes — so the traveler understands how the city moves.
• Primary action: Select a transportation option to see how it applies to the trip.
• Supporting actions: Open Route Guide for guidance between destinations; open Itinerary to align transport with planned activities.
• Domain entities: Transportation option (mode, city, description); city transportation system.
• Component responsibilities: Mode-by-mode option display (bus, train, metro, taxi, walking); city system overview; entry to Route Guide.
• States: Loading — transport options load with placeholders. Empty — no transport information available for the destination yet, with a prompt to change destination. Success — options listed by mode with descriptions. Error — transport information fails to load; an inline message offers retry. Recovery — retry, or open Route Guide.

Route Guide

• Information and state: Guidance on how to travel between destinations — the routes that connect the places the traveler plans to visit.
• Primary action: Select an origin and destination to view the guidance for traveling between them.
• Supporting actions: Open Transport for the city's available modes; open Itinerary to align the route with the day's plan.
• Domain entities: Route (origin, destination, available modes, guidance).
• Component responsibilities: Origin and destination selection; route guidance display; mode references; links to Transport and Itinerary.
• States: Loading — route guidance loads with placeholders. Empty — no route guidance available for the selected pair yet, with a prompt to choose another pair. Success — guidance shown for the selected origin and destination. Error — guidance fails to load; an inline message offers retry. Recovery — retry, or select a different origin and destination.

Outfits

• Information and state: Outfit and dress recommendations for the trip, based on the destination, weather, planned activities, and local culture, prioritizing both comfort and style, and covering sightseeing, restaurants, events, and other activities.
• Primary action: Select an activity context to view the outfit recommendation for it.
• Supporting actions: Open Itinerary to align an outfit with a planned activity; open Packing to carry the recommendation into the checklist.
• Domain entities: Outfit recommendation (activity context, destination, weather, cultural notes, comfort and style guidance).
• Component responsibilities: Activity-context selection (sightseeing, restaurants, events, other activities); recommendation display with comfort and style guidance; links to Itinerary and Packing.
• States: Loading — recommendations load with placeholders. Empty — no recommendations yet because the trip lacks destination or activity context, with a prompt to complete the trip details or itinerary. Success — recommendations shown per activity context. Error — recommendations fail to load; an inline message offers retry. Recovery — retry, or open Itinerary to add activity context and return.

Packing

• Information and state: A personalized packing checklist generated from the trip's destination, weather, and trip details, with each item checkable.
• Primary action: Generate the packing checklist for the trip.
• Supporting actions: Check or uncheck items as they are packed; add or remove items; regenerate the checklist after trip details change; open Outfits to inform what to carry.
• Domain entities: Packing checklist; packing item (name, checked state).
• Component responsibilities: Generate control; checklist display with per-item check controls; add and remove item controls; link to Outfits.
• States: Loading — checklist generation shows an in-progress state. Empty — no checklist generated yet, with a prompt to generate one. Success — checklist generated from destination, weather, and trip details, with checked state saved. Error — generation fails; an inline message offers retry and any previously generated checklist remains available. Recovery — retry generation, or add items manually.

3. Functional Requirements

Each requirement below is a distinct story point with its provenance, lifecycle facts, and observable acceptance.

FR-1 — Create and manage trips with destination, dates, and travel details (explicit) As a Trip Planner, I should create and manage trips with destination, dates, and travel details, so that each trip has a durable record I can return to.

• Trigger/input: The traveler opens New Trip from Trips and enters destination, dates, and travel details.
• Observable result: A trip record is created and owned by the verified traveler, and appears in Trips with its destination, dates, and status.
• Access state: Requires a verified traveler session.
• Failure/recovery: Invalid or missing destination or dates produce field-level messages and retain entered values; the traveler corrects and resaves or cancels.
• Continuation: The traveler lands on Trip Details for the new trip and can open any planning module.

FR-2 — Track the trip before and during travel (explicit) As an In-Trip Traveler, I should track the trip before and during travel, so that I always know where the trip stands.

• Trigger/input: The traveler opens Trip Tracking for a trip and updates its status or plan state.
• Observable result: The trip's status is saved and reflected in Trip Tracking and in the trip's summary in Trips.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed status update shows an inline message, keeps the previous status visible, and offers retry.
• Continuation: The traveler jumps to Itinerary, Transport, Route Guide, or Time Planner for the trip.

FR-3 — Update or change plans easily (explicit) As a Trip Planner, I should update or change my plans easily, so that the trip stays accurate when things change.

• Trigger/input: The traveler edits destination, dates, or travel details on Trip Details, or edits an itinerary activity.
• Observable result: The change is saved and reflected immediately across the trip's pages.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed save shows an inline message and preserves unsaved edits; the traveler retries.
• Continuation: The traveler continues in the module they were editing.

FR-4 — Suggest interesting places, activities, attractions, restaurants, and experiences (explicit) As a Trip Planner, I should be shown interesting places to visit, activities, attractions, restaurants, and experiences, so that I have something to plan around.

• Trigger/input: The traveler opens Recommendations for a trip's destination.
• Observable result: A list of recommendations grouped by type is shown for the destination.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler opens a recommendation to view its place information or add it to the itinerary.

FR-5 — Recommendations based on destination and preferences (explicit) As a Trip Planner, I should get recommendations based on my destination and preferences, so that suggestions fit what I actually want.

• Trigger/input: The traveler sets or changes preferences on Preferences, or opens Recommendations for a destination.
• Observable result: Recommendations reflect the trip's destination and the traveler's stated preferences.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed preference save shows an inline message and preserves unsaved changes; the traveler retries.
• Continuation: The traveler returns to Recommendations to see the effect.

FR-6 — Create a day-by-day itinerary (explicit) As a Trip Planner, I should create a day-by-day itinerary, so that each day of the trip has a plan.

• Trigger/input: The traveler opens Itinerary for a trip and adds an activity to a day.
• Observable result: The activity is saved to that day and shown in the day-by-day layout.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed save shows an inline message and preserves the entered activity; the traveler retries.
• Continuation: The traveler adds further activities or opens Recommendations and Places to source more.

FR-7 — Rearrange, add, remove, or change itinerary activities when plans change (explicit) As a Trip Planner, I should rearrange, add, remove, or change activities when plans change, so that the itinerary stays flexible.

• Trigger/input: The traveler drags an activity to a new position or day, edits an activity, or removes an activity.
• Observable result: The new arrangement, edit, or removal is saved and reflected immediately.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed reorder or save shows an inline message, restores the previous arrangement, and offers retry.
• Continuation: The traveler continues arranging the itinerary.

FR-8 — Estimate and track the travel budget (explicit) As a Trip Planner, I should estimate and track my travel budget, so that I know what the trip costs and how much is left.

• Trigger/input: The traveler sets or updates the budget estimate on Budget.
• Observable result: The estimate is saved and the tracked total and remaining amount are shown against it.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed save shows an inline message and preserves the entered value; the traveler retries.
• Continuation: The traveler opens Expenses to record what counts against the budget.

FR-9 — Organize expenses by category (explicit) As a Trip Planner, I should organize expenses such as transportation, accommodation, food, shopping, and activities, so that I can see where the money goes.

• Trigger/input: The traveler records an expense on Expenses with a category and amount.
• Observable result: The expense is saved under its category, and category totals and budget progress update.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed save shows an inline message and preserves the entered expense; the traveler retries or edits the entry.
• Continuation: The traveler records further expenses or reviews Budget.

FR-10 — Time-management suggestions (explicit) As an In-Trip Traveler, I should get time-management suggestions, so that I make the most of my trip.

• Trigger/input: The traveler opens Time Planner for a trip with planned activities.
• Observable result: Suggestions are shown per day, derived from the trip's dates and planned activities.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler applies a suggestion by opening Itinerary and adjusting the day's activities.

FR-11 — Add photos, notes, and memorable moments (explicit) As a Memory Keeper, I should add photos, notes, and memorable moments from my trip, so that the trip is recorded.

• Trigger/input: The traveler opens Memories for a trip and adds a photo, note, or moment.
• Observable result: The memory is saved to the trip and shown in the trip's memory list.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed upload or save shows an inline message and preserves the entered note; the traveler retries.
• Continuation: The traveler adds further memories or opens Memory Library.

FR-12 — Organize memories by destination or trip (explicit) As a Memory Keeper, I should organize memories by destination or trip, so that I can revisit them in the grouping that makes sense.

• Trigger/input: The traveler opens Memory Library and switches the grouping between destination and trip.
• Observable result: Memories are grouped and browsable by the selected grouping.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler opens a memory or grouping to view it in full.

FR-13 — Show popular attractions, hidden gems, landmarks, and must-visit locations (explicit) As a Trip Planner, I should be shown popular attractions, hidden gems, landmarks, and must-visit locations, so that I know what is worth seeing.

• Trigger/input: The traveler opens Places for a destination.
• Observable result: Places are listed by type, covering popular attractions, hidden gems, landmarks, and must-visit locations.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler opens a place to its Place Details or adds it to the itinerary.

FR-14 — Useful information about each place (explicit) As a Trip Planner, I should get useful information about each place, so that I can decide whether and how to visit it.

• Trigger/input: The traveler opens Place Details for a selected place.
• Observable result: Useful information about the place is shown.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message, offers retry, and links back to Places.
• Continuation: The traveler adds the place to the itinerary or opens Transport or Route Guide.

FR-15 — Understand the city's transportation system (explicit) As an In-Trip Traveler, I should understand the city's transportation system, so that I can move around confidently.

• Trigger/input: The traveler opens Transport for the destination.
• Observable result: The city's transportation system is presented with its available options.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler selects an option or opens Route Guide.

FR-16 — Show available options such as buses, trains, metro, taxis, and walking routes (explicit) As an In-Trip Traveler, I should see available options such as buses, trains, metro, taxis, and walking routes, so that I can choose how to travel.

• Trigger/input: The traveler views Transport for the destination.
• Observable result: Options are listed by mode, covering buses, trains, metro, taxis, and walking routes.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler opens Route Guide to see how the options apply between destinations.

FR-17 — Guidance on how to travel between destinations (explicit) As an In-Trip Traveler, I should get guidance on how to travel between destinations, so that I can get from one place to the next.

• Trigger/input: The traveler opens Route Guide and selects an origin and destination.
• Observable result: Guidance for traveling between the selected origin and destination is shown.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry; the traveler can select a different pair.
• Continuation: The traveler opens Transport for the city's modes or Itinerary to align the route with the day's plan.

FR-18 — Suggest outfits based on destination, weather, planned activities, and local culture (explicit) As a Trip Planner, I should get outfit suggestions based on my destination, weather, planned activities, and local culture, so that I dress appropriately.

• Trigger/input: The traveler opens Outfits for a trip with destination and activity context.
• Observable result: Outfit recommendations are shown, reflecting destination, weather, planned activities, and local culture.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler opens Itinerary to align an outfit with a planned activity or Packing to carry it into the checklist.

FR-19 — Prioritize both comfort and style in outfit recommendations (explicit) As a Trip Planner, I should get outfit recommendations that prioritize both comfort and style, so that I feel good and stay comfortable.

• Trigger/input: The traveler views an outfit recommendation on Outfits.
• Observable result: Each recommendation states its comfort and style guidance together.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler selects another activity context.

FR-20 — Outfit recommendations for sightseeing, restaurants, events, and other activities (explicit) As a Trip Planner, I should get outfit recommendations for sightseeing, restaurants, events, and other activities, so that each part of the trip is covered.

• Trigger/input: The traveler selects an activity context on Outfits.
• Observable result: A recommendation is shown for the selected context, covering sightseeing, restaurants, events, and other activities.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed load shows an inline message and offers retry.
• Continuation: The traveler selects another context or opens Packing.

FR-21 — Generate a personalized packing checklist (explicit) As a Trip Planner, I should generate a personalized packing checklist based on my destination, weather, and trip details, so that I pack what the trip actually needs.

• Trigger/input: The traveler opens Packing for a trip and generates the checklist.
• Observable result: A checklist is generated from the trip's destination, weather, and trip details, and each item can be checked as packed.
• Access state: Requires a verified traveler session.
• Failure/recovery: A failed generation shows an inline message and offers retry; any previously generated checklist remains available, and the traveler can add items manually.
• Continuation: The traveler checks items off, adds or removes items, or regenerates after trip details change.

FR-22 — Self-service enrollment for independently starting travelers (required_inference) As a Trip Planner, I should be able to enroll myself, so that I can start planning without waiting for anyone to set me up.

• Trigger/input: An anonymous visitor chooses "Start a trip" on Landing and completes Sign Up.
• Observable result: A traveler identity is created and the traveler enters the application verified, landing on Trips.
• Access state: Anonymous entry; the interaction that establishes access is reachable without a session.
• Failure/recovery: Invalid or already-used credentials produce field-level messages, entered values are retained, and the visitor can correct and resubmit or switch to Login.
• Continuation: The traveler creates their first trip from the empty-state prompt.

FR-23 — Returning verification before accessing saved trips and planning records (required_inference) As a Trip Planner, I should verify myself when I return, so that my trips, itineraries, budgets, expenses, and memories stay mine.

• Trigger/input: A returning traveler opens Login and submits credentials.
• Observable result: The session is restored and the traveler's existing trips are listed on Trips.
• Access state: Anonymous entry to Login; all planning destinations remain unavailable until verification succeeds.
• Failure/recovery: Incorrect credentials produce a non-revealing error, the entered identifier is retained, and the traveler can retry or switch to Sign Up.
• Continuation: The traveler opens an existing trip and continues planning or tracking.

4. User Personas

Trip Planner

Product context. The Trip Planner is the traveler who owns the end-to-end planning workflow, working mostly before departure and returning to the plan whenever something changes. They arrive with a destination and rough dates and need the app to turn that into a coherent, adjustable plan.

Primary goal. A coherent, up-to-date trip plan they can adjust easily as plans change, so the trip stays organized from initial idea through departure.

Distinct accepted responsibilities. Creating and managing trips with destination, dates, and travel details; browsing destination recommendations for places, activities, attractions, restaurants, and experiences; stating the preferences that shape those recommendations; building and rearranging a day-by-day itinerary; estimating and tracking a budget; recording and organizing expenses by category; viewing outfit recommendations for each activity context; and generating a personalized packing checklist.

Relevant inputs and decisions. Destination and dates; travel details; preference choices; which recommendations and places to add to the itinerary; the budget estimate; the category of each expense; which activity context an outfit is for; and whether to regenerate the packing checklist after trip details change.

Interactions with other accepted participants. The Trip Planner's plan is the artifact the In-Trip Traveler executes and adapts, and the trip the Memory Keeper records. The Trip Planner's itinerary and trip details are the context that outfit and packing recommendations read.

Observable success. The trip exists with accurate destination, dates, and details; the itinerary reflects the current plan; the budget and expenses agree; and the packing checklist matches the trip.

In-Trip Traveler

Product context. The In-Trip Traveler is the traveler actively on the trip, working in real time and often on a phone, where conditions change faster than the plan.

Primary goal. Execute and adapt the plan in real time, so that a day of travel goes smoothly despite changes.

Distinct accepted responsibilities. Tracking the trip before and during travel; updating or changing plans on the fly; consulting local transportation options and guidance for traveling between destinations; and following time-management suggestions to make the most of each day.

Relevant inputs and decisions. The trip's current status; what changed in the plan; which transportation mode to take; which route guidance applies between two places; and which time-management suggestion to apply to the day.

Interactions with other accepted participants. The In-Trip Traveler works from the plan the Trip Planner built and edits it in place, so the Trip Planner's itinerary and trip details change as a result. The trip the In-Trip Traveler is executing is the same trip the Memory Keeper records.

Observable success. The trip's status reflects reality, the day's plan has been adjusted where needed, and the traveler knows how to get from one place to the next.

Memory Keeper

Product context. The Memory Keeper is the traveler who captures the trip as it happens and afterwards, and who wants the record to be findable later rather than scattered.

Primary goal. A lasting, well-organized record of the journey.

Distinct accepted responsibilities. Adding photos, notes, and memorable moments from the trip; and organizing memories by destination or trip.

Relevant inputs and decisions. Which photo, note, or moment to add; which trip it belongs to; and whether to browse the library grouped by destination or by trip.

Interactions with other accepted participants. The Memory Keeper records the same trip the Trip Planner planned and the In-Trip Traveler executed, and the trip's destination is one of the two groupings the library offers.

Observable success. Memories are saved to the right trip and can be revisited grouped by the trip or the destination they belong to.

5. Core User Flows

Flow 1 — Trip Planner: enroll and create the first trip

1. The Trip Planner arrives anonymously at Landing and reads what the product covers.
2. They choose Start a trip, the single primary action, which takes them to Sign Up.
3. On Sign Up they enter credentials and submit. The submit control shows an in-progress state.
4. Observable result: a traveler identity is created and the traveler enters the application verified, landing on Trips.
5. Trips is empty, so it shows a prompt to create the first trip. The traveler opens New Trip.
6. On New Trip they enter destination, dates, and travel details and save.
7. Observable result: the trip is created and owned by the traveler, and they land on Trip Details for the new trip.
8. Failure/recovery: if destination or dates are missing or invalid, field-level messages appear and the entered values are retained; the traveler corrects and resaves, or cancels without creating a trip.
9. Continuation: from Trip Details the traveler opens any planning module for this trip.

Flow 2 — Trip Planner: shape recommendations with preferences

1. From Trip Details the Trip Planner opens Recommendations for the trip's destination.
2. Observable result: recommendations for places to visit, activities, attractions, restaurants, and experiences are listed, grouped by type.
3. If the list does not fit what they want, the traveler opens Preferences and changes their stated preferences, then saves.
4. Observable result: the preferences are saved and applied to subsequent recommendations.
5. The traveler returns to Recommendations and sees the list shaped by the new preferences.
6. Failure/recovery: if the preference save fails, an inline message appears and unsaved changes are preserved; the traveler retries. If recommendations fail to load, an inline message offers retry.
7. Continuation: the traveler opens a recommendation to view its place information or adds it to the itinerary.

Flow 3 — Trip Planner: build and rearrange the day-by-day itinerary

1. From Trip Details the Trip Planner opens Itinerary.
2. Observable result: the trip's dates frame a day-by-day layout; if no activities exist yet, the page prompts them to add the first or browse Recommendations.
3. The traveler adds an activity to a day and saves it.
4. Observable result: the activity is saved to that day and shown in the layout.
5. The traveler drags an activity to a new position or a different day, using the visible grip; the item lifts and tilts while dragged and settles into place.
6. Observable result: the new arrangement is saved and reflected immediately.
7. The traveler edits an activity's details or removes an activity.
8. Observable result: the edit or removal is saved and reflected immediately.
9. Failure/recovery: if a save or reorder fails, an inline message appears, the previous arrangement is restored, and the traveler can retry or re-drag the item.
10. Continuation: the traveler opens Recommendations or Places to source more activities, or moves on to budget.

Flow 4 — Trip Planner: estimate the budget and record expenses

1. From Trip Details the Trip Planner opens Budget.
2. Observable result: if no budget is set, the page prompts them to set an estimate.
3. The traveler sets or updates the budget estimate and saves.
4. Observable result: the estimate is saved and the tracked total and remaining amount are shown against it.
5. The traveler opens Expenses and records an expense with its category — transportation, accommodation, food, shopping, or activities — and amount.
6. Observable result: the expense is saved under its category, and category totals and budget progress update.
7. The traveler edits or removes a recorded expense, or changes its category.
8. Observable result: the change is saved and the totals and budget progress update again.
9. Failure/recovery: if a save fails, an inline message appears and the entered expense or estimate is preserved; the traveler retries or edits the entry.
10. Continuation: the traveler returns to Budget to review progress, or continues planning.

Flow 5 — Trip Planner: outfit recommendations and packing checklist

1. From Trip Details the Trip Planner opens Outfits.
2. Observable result: outfit recommendations are shown, reflecting the destination, weather, planned activities, and local culture, with comfort and style guidance stated together.
3. The traveler selects an activity context — sightseeing, restaurants, events, or another activity.
4. Observable result: a recommendation is shown for that context.
5. Failure/recovery: if recommendations fail to load, an inline message offers retry; if the trip lacks destination or activity context, the page prompts them to complete the trip details or itinerary.
6. The traveler opens Packing and generates the checklist.
7. Observable result: a checklist is generated from the trip's destination, weather, and trip details, and each item can be checked as packed.
8. The traveler checks items off, adds or removes items, or regenerates the checklist after trip details change.
9. Failure/recovery: if generation fails, an inline message offers retry, any previously generated checklist remains available, and the traveler can add items manually.
10. Continuation: the traveler returns to Trip Details or opens Itinerary to align an outfit with a planned activity.

Flow 6 — In-Trip Traveler: track the trip and adapt the plan during travel

1. The In-Trip Traveler opens Trips and selects the trip that is now in progress.
2. They open Trip Tracking and update the trip's status or plan state.
3. Observable result: the status is saved and reflected in Trip Tracking and in the trip's summary in Trips.
4. Failure/recovery: if the update fails, an inline message appears, the previous status remains shown, and the traveler can retry.
5. The traveler opens Itinerary and rearranges, adds, removes, or changes the day's activities to match what is actually happening.
6. Observable result: the changes are saved and reflected immediately.
7. Failure/recovery: if a save or reorder fails, an inline message appears, the previous arrangement is restored, and the traveler can retry.
8. Continuation: the traveler opens Time Planner to see how to make the most of the rest of the day.

Flow 7 — In-Trip Traveler: understand local transport and travel between destinations

1. The In-Trip Traveler opens Transport for the destination.
2. Observable result: the city's transportation system is presented with its available options — buses, trains, metro, taxis, and walking routes — listed by mode.
3. The traveler selects an option to see how it applies to the trip.
4. Failure/recovery: if transport information fails to load, an inline message offers retry.
5. The traveler opens Route Guide and selects an origin and destination.
6. Observable result: guidance for traveling between the selected origin and destination is shown.
7. Failure/recovery: if guidance fails to load, an inline message offers retry and the traveler can select a different pair.
8. Continuation: the traveler opens Itinerary to align the route with the day's plan, or returns to Transport for another mode.

Flow 8 — In-Trip Traveler: follow time-management suggestions

1. The In-Trip Traveler opens Time Planner for the trip.
2. Observable result: suggestions are shown per day, derived from the trip's dates and planned activities.
3. If the itinerary has no activities yet, the page shows an empty state prompting them to build the itinerary first.
4. The traveler applies a suggestion by opening Itinerary and adjusting the day's activities.
5. Observable result: the adjusted plan is saved and reflected in the itinerary.
6. Failure/recovery: if suggestions fail to load, an inline message offers retry.
7. Continuation: the traveler returns to Trip Tracking or continues the day.

Flow 9 — Memory Keeper: capture memories on a trip

1. The Memory Keeper opens Trips, selects the trip, and opens Memories.
2. Observable result: if the trip has no memories yet, the page prompts them to add the first.
3. The traveler adds a photo, a note, or a memorable moment to the trip.
4. Observable result: the memory is saved to the trip and shown in the trip's memory list.
5. Failure/recovery: if the upload or save fails, an inline message appears and the entered note is preserved; the traveler retries.
6. Continuation: the traveler adds further memories or opens Memory Library.

Flow 10 — Memory Keeper: organize and revisit memories by destination or trip

1. The Memory Keeper opens Memory Library.
2. Observable result: their memories are shown grouped by the current grouping.
3. The traveler switches the grouping between destination and trip.
4. Observable result: memories are regrouped and browsable by the selected grouping.
5. The traveler opens a memory or a grouping to view it in full.
6. Failure/recovery: if the library fails to load, an inline message offers retry; the traveler can also open a trip's Memories page directly.
7. Continuation: the traveler returns to the library or opens Memories to add another memory.

Flow 11 — Trip Planner: browse places and add one to the itinerary

1. From Trip Details or Recommendations, the Trip Planner opens Places for the destination.
2. Observable result: places are listed by type, covering popular attractions, hidden gems, landmarks, and must-visit locations.
3. The traveler filters or browses by place type and opens a place to Place Details.
4. Observable result: useful information about the place is shown.
5. The traveler adds the place to the trip's itinerary.
6. Observable result: the place appears as an activity in the itinerary.
7. Failure/recovery: if places or place information fail to load, an inline message offers retry and a link back to Places.
8. Continuation: the traveler opens Transport or Route Guide to plan how to get there, or returns to Places.

Flow 12 — Returning Trip Planner: verify and resume an existing trip

1. A returning Trip Planner opens Login and submits their credentials.
2. Observable result: the session is restored and their existing trips are listed on Trips.
3. Failure/recovery: incorrect credentials produce a non-revealing error, the entered identifier is retained, and the traveler can retry or switch to Sign Up.
4. The traveler opens an existing trip to Trip Details.
5. Observable result: the trip's saved destination, dates, details, itinerary, budget, expenses, and memories are available.
6. Continuation: the traveler continues planning, tracking, or recording memories.

6. Visuals Colors and Theme

Muse and headline. Jessica Walsh — Saturated wanderlust: a trip planner that feels like a colour-saturated travel poster you can drag around. The visual language is loud enough to sell "I want to go there" and structured enough that a packing list and an expense ledger stay legible.

Colour tokens (light mode).

Proportion: ~55% cream ground, ~20% pink, ~10% each tangerine and lime, ~5% cobalt. Cobalt is never the action colour.

Typography.

• Headings: Archivo Black at 400 weight only — it is already maximum-weight, so character comes from size, tight tracking (−0.02em), and case rather than from bolding. Headlines are sentence case with deliberate line breaks, set enormous and stacked; labels and section eyebrows are all-caps Archivo Black at small sizes with +0.12em tracking, treated as sticker tags. No italic, no drop shadows on type.
• Body: DM Sans.
• Scale: 1.333 modular on a 4pt baseline — display 44px mobile → 128px desktop (clamp(2.75rem, 9vw, 8rem)), h1 34→72, h2 26→44, h3 20→28, body 16→18 with 1.6 line-height, label 12→13 all-caps, numeral 28→56 tabular DM Sans for budget figures. Headlines get 0.95 line-height; body never below 16px.

Shape language. Big, confident geometry: 32px radii on cards and photo frames, full pills on buttons and filter chips, capsule-shaped day tabs. Colour fields are hard-edged rectangles that collide at section boundaries with 8px diagonal notches cut out of them rather than soft gradients. Sticker elements — rotated 3–6°, chunky 3px ink outline, flat offset shadow with zero blur — sit on top of colour fields as accents: a rotated "DAY 3" tag, a circular weather badge, a packing-tape strip. No blur, no glass, no soft drop shadows anywhere.

Layout. Colour-blocked sections stacked vertically, each owning a full-bleed colour field: cream hero, pink trip-tracking band, tangerine budget band, lime packing band, cobalt transit band, white memory gallery. Within each band, an asymmetric 12-column grid where content sits in columns 2–9 and a large sticker or oversized numeral bleeds into columns 10–12. Itinerary days are horizontally scrollable capsule rails on mobile and a 7-column week grid on desktop, each day card draggable with a visible grip. Cards are never identical: the itinerary card, the place card, and the memory polaroid each have distinct proportions, radii, and colour grounds.

Imagery. Surreal, art-directed travel photography and 3D props in saturated colour: a giant inflatable flamingo on a Lisbon rooftop, a passport photographed on a hot pink seamless backdrop, a stack of folded outfits arranged as a colour-blocked flat-lay, a metro ticket enlarged as an object. No stock-photo couples looking at maps. The memory gallery presents user photos as polaroids pinned at slight rotations onto the cream ground with washi-tape corners. Icons are chunky 3px-stroke vector pictograms in ink on colour fields, never thin-line.

Readable text and controls stay whole. Headlines, wordmarks, labels, numbers, card text, and controls stay entirely inside the viewport and their container at 375px, 768px, and 1280px, wrapping or scaling (for example font-size: clamp(...) with its mobile size) to fit, with no other element covering any part of them. Imagery, decoration, and motion may be cropped, bled off an edge, rotated, overlapped, or cut as the direction asks, as long as they cover no readable text or control. Moving and scrollable content — the destination ticker, the itinerary capsule rail — may cross the viewport or container edge by design; every item becomes fully readable as it passes. Under prefers-reduced-motion, provide a usable static arrangement: wrap items into rows or allow horizontal scrolling so each item can be brought fully into view.

Avoid. Any blue-indigo primary or accent on a white ground; cobalt #2B3BFF as an action colour; glassmorphism, frosted panels, gradient blobs, and soft blurred drop shadows; a grid of identical hover-lift cards for places, activities, or recommendations; Inter, Roboto, Poppins, Manrope, or any neutral geometric sans as the heading voice; a centred hero with headline + subtext + button stacked in the middle of the viewport; thin-line icon sets and pastel map-pin illustration; muted, desaturated, or monochrome travel imagery; soft-fade, bouncy, or elastic motion that plays without a functional trigger. The generic indigo/blue-on-white SaaS template is forbidden for this project.

7. Signature Design Concept

"WANDERPLAN" as architecture on the Landing page.

The public entry is a full-bleed cream field (#FFF3E4). The wordmark WANDERPLAN is set in Archivo Black at clamp(3.5rem, 13vw, 11rem), stacked across three lines and bleeding off the right edge so the final "N" is cropped by the viewport — type as architecture, not a centred headline block. The wordmark stays whole and readable at every viewport; the crop gesture is carried by the surrounding colour field, not by the letters.

Behind the type, a hot pink #FF2E88 rectangle occupies the lower-left 60% of the hero, and a tangerine #FF7A1A circle overlaps its corner. A surreal photograph of a vintage suitcase overflowing with colour-blocked clothing is cut out and placed on the pink block, its handle breaking above the type. The single CTA — "Start a trip" — is a full pill in ink #1A0F2E with cream text, pinned bottom-left inside the pink block, never centred. A thin marquee ticker of destination names in all-caps DM Sans runs along the very bottom edge of the viewport. There is no subtext paragraph, no three-feature row, and no gradient.

The concept recomposes only accepted content and controls: the product identity, the single primary action that begins the identity-establishment path, and the destination names that describe what the product covers. It introduces no new behaviour, page, or destination.

8. Interaction Model & Motion Direction

Interaction Model: Animated Motion Tempo: expressive Hero Dimensionality: layered_2d

Landing Hero Motion Brief.

• Focal subject: the oversized stacked WANDERPLAN wordmark and the cut-out vintage suitcase resting on the hot pink colour block, with the tangerine circle overlapping its corner.
• Input → transformation → outcome thesis: as the hero enters, each word of the wordmark pops from 0.85 to 1 with a 60ms stagger over 320ms cubic-bezier(.2,.9,.3,1.2); the pink block and tangerine circle settle into place beneath it; the suitcase cut-out lands on the pink block with its handle breaking above the type. The outcome is a composed first frame in which the wordmark reads as architecture and the single "Start a trip" pill is already reachable.
• Motion vocabulary: staggered word scale-ins; hard 120ms fill swaps on filter chips rather than fades; section colour fields wiping in from the left edge as they enter the viewport, 400ms, once; itinerary items lifting and tilting 2° on drag with a spring settle; the destination marquee running continuously along the bottom edge; a small illustrated suitcase character waving on the packing checklist when an item is checked.
• Composed first frame: cream field, stacked wordmark bleeding off the right edge, pink block lower-left with the tangerine circle at its corner, suitcase cut-out on the pink block, ink pill CTA pinned bottom-left inside the pink block, destination ticker along the bottom edge.
• Reduced-motion state: all of the above collapses to instant state changes. The wordmark, pink block, tangerine circle, suitcase, CTA, and ticker appear in their final positions with no stagger, no wipe, and no marquee animation; the ticker becomes a statically wrapped row or a horizontally scrollable row so every destination name can be brought fully into view.

9. Non-Functional Requirements

NFR-1 — Durable, traveler-bound state (required_inference) Trips, itineraries, budgets, expenses, time suggestions, memories, and packing checklists must persist across sessions and remain bound to the traveler who created them, so that returning verification restores exactly that traveler's records. Rationale: the accepted journeys require a traveler to leave and resume planning, tracking, and memory capture.

NFR-2 — Access boundary on planning destinations (required_inference) Landing, Sign Up, and Login are reachable anonymously; every other page requires a verified traveler session. Rationale: the accepted journeys require durable traveler-owned records, and the interaction that establishes access must not itself require access.

NFR-3 — Readable text and controls at every viewport (explicit, from the creative direction) Headlines, wordmarks, labels, numbers, card text, and controls stay entirely inside the viewport and their container at 375px, 768px, and 1280px, wrapping or scaling to fit, with no other element covering any part of them. Imagery, decoration, and motion may be cropped, bled, rotated, overlapped, or cut as the direction asks, provided they cover no readable text or control.

NFR-4 — Reduced-motion usability (explicit, from the creative direction) Under prefers-reduced-motion, all motion collapses to instant state changes, and moving or scrollable content becomes a usable static arrangement — wrapped rows or horizontal scrolling — so every item can be brought fully into view.

NFR-5 — Legibility of dense planning data (explicit, from the creative direction) Budget figures, expense category totals, packing checklist items, and itinerary activities remain legible on their colour fields: ink #1A0F2E is the only text colour, body text never falls below 16px, and budget numerals use tabular DM Sans so figures align.

NFR-6 — Responsive itinerary layout (explicit, from the creative direction) Itinerary days render as a horizontally scrollable capsule rail on mobile and a 7-column week grid on desktop, with each day card draggable via a visible grip.

NFR-7 — Media handling for memories (required_inference) Photo uploads for memories must succeed or fail with a clear, recoverable outcome, and a failed upload must not discard the accompanying note. Rationale: the accepted memory-capture journey requires the traveler to add photos and notes and to recover from a failed upload.

NFR-8 — Recommendation and place data freshness (required_inference) Recommendations, place information, transport options, route guidance, and outfit recommendations must reflect the trip's current destination and the traveler's current preferences when the traveler opens the relevant page. Rationale: the accepted journeys require recommendations to be based on the destination and preferences, and outfit suggestions to reflect destination, weather, planned activities, and local culture.

10. Tech Stack

• Frontend: React (web), delivering the custom first-party pages in the closed page contract. (Default — not specified by user)
• Backend: Python with FastAPI, serving the trip, itinerary, budget, expense, memory, recommendation, place, transport, outfit, and packing endpoints and enforcing the verified-session access boundary. (Default — not specified by user)
• Storage: A relational database for traveler identities, trips, itinerary days and activities, budgets, expenses, memories, packing checklists, and preferences; object storage for memory photos. (Default — not specified by user)
• Packaging and local orchestration: Docker and docker-compose. (Default — not specified by user)
• Deployment: Container deployment of the frontend and backend services. Kubernetes is not required by any accepted requirement and is therefore not included. (Default — not specified by user)

11. Assumptions and Constraints

Assumptions.

• A1 (required_inference) — Travelers independently begin planning, so self-service enrollment and returning verification are the identity path; no invitation, provisioning, or deployment bootstrap is required by any accepted requirement.
• A2 (required_inference) — A trip's destination and dates are the frame for its itinerary days, and its destination, weather, and trip details are the inputs for its packing checklist and outfit recommendations.
• A3 (required_inference) — Recommendation, place, transport, route, and outfit content is presented on first-party pages; where the application draws on external travel data, the application consumes and surfaces it rather than handing the traveler to a provider-owned surface.
• A4 (required_inference) — A memory belongs to exactly one trip, and its destination grouping derives from that trip's destination.
• A5 (Default — not specified by user) — The application is delivered as a responsive web application; no native mobile client is required by any accepted requirement.

Constraints.

• C1 (explicit) — The page inventory in Section 2c is the closed, ordered page contract for this release: Landing, Sign Up, Login, Trips, New Trip, Trip Details, Trip Tracking, Recommendations, Preferences, Itinerary, Budget, Expenses, Time Planner, Memories, Memory Library, Places, Place Details, Transport, Route Guide, Outfits, Packing. No page is added, removed, merged, split, renamed, or reordered.
• C2 (explicit) — Landing, Sign Up, and Login are anonymously reachable; every other page requires a verified traveler session.
• C3 (explicit) — The three accepted personas — Trip Planner, In-Trip Traveler, and Memory Keeper — are the closed active-human catalog. No additional persona is created.
• C4 (explicit) — The visual direction in Sections 6–8 is binding: cream ground #FFF3E4, hot pink #FF2E88 as the primary action and identity colour, tangerine #FF7A1A for budget and time modules, lime #C6F04A for packing and checklist modules, cobalt #2B3BFF reserved strictly for transit and wayfinding, ink #1A0F2E as the only text colour, and muted #7A6A8C for metadata. Archivo Black at 400 weight for headings, DM Sans for body.
• C5 (explicit) — The generic indigo/blue-on-white SaaS template is forbidden for this project. Cobalt #2B3BFF is never the action colour. Glassmorphism, frosted panels, gradient blobs, and soft blurred drop shadows are excluded. Inter, Roboto, Poppins, Manrope, and neutral geometric sans headings are excluded. A centred hero with headline, subtext, and button stacked in the middle of the viewport is excluded. Thin-line icon sets and pastel map-pin illustration are excluded. Muted, desaturated, or monochrome travel imagery is excluded. Soft-fade, bouncy, or elastic motion that plays without a functional trigger is excluded.
• C6 (explicit) — Readable text and controls stay whole at every viewport; where the direction asks readable text or a control to be cropped, clipped, covered, or run off an edge, the text or control is kept whole and the gesture is carried by imagery or decoration instead.
• C7 (explicit) — Current scope excludes booking or payment of flights, hotels, or tickets; social sharing or collaboration between multiple travelers on one trip; real-time GPS navigation; and any account-management capability beyond self-service enrollment and returning verification. These are not represented by any current page or requirement.

12. Glossary

• Trip — A durable record owned by a verified traveler, defined by destination, dates, and travel details, and carrying a tracking status.
• Trip Planner — The accepted persona who owns the end-to-end planning workflow before departure.
• In-Trip Traveler — The accepted persona who executes and adapts the plan during travel.
• Memory Keeper — The accepted persona who captures and organizes travel memories.
• Itinerary day — One day within a trip's date range, holding the activities planned for that day.
• Itinerary activity — A planned item assigned to an itinerary day, with a name, ordering or time, and optional notes.
• Expense category — One of transportation, accommodation, food, shopping, or activities; the grouping under which an expense is recorded.
• Trip budget — The traveler's estimate for a trip, against which recorded expenses are tracked.
• Time-management suggestion — Guidance for a trip day, derived from the trip's dates and planned activities, intended to help the traveler make the most of the trip.
• Memory — A photo, note, or memorable moment attached to a trip, and grouped in the library by destination or by trip.
• Place — An attraction, hidden gem, landmark, or must-visit location for a destination, with useful visiting information.
• Transportation option — A mode available in the destination city: bus, train, metro, taxi, or walking route.
• Route guidance — Instructions for traveling between a selected origin and destination.
• Outfit recommendation — Suggested dress for an activity context, based on destination, weather, planned activities, and local culture, prioritizing both comfort and style.
• Packing checklist — A personalized list of items to carry, generated from the trip's destination, weather, and trip details, with each item checkable.
• Verified traveler session — The state established by Sign Up or Login that binds durable trip records to the correct traveler and grants access to all non-anonymous pages.