tasks/c55/task.json

{
 "task_id": "c55",
 "layer": "composite",
 "seed_type": "prd",
 "operators": [
  "generate",
  "add state",
  "wire up data",
  "remove section",
  "make interactive"
 ],
 "difficulty": "challenging",
 "levers": [
  "state coupling",
  "cross-requirement combined state",
  "exact numeric assertions"
 ],
 "domain": "community forms",
 "repair": false,
 "inject_type": null,
 "seed_meta": {
  "authored_by": "hand",
  "materials": "none"
 },
 "title": "Trace Fitness: From Site Build to Discounted-Price Recalculation",
 "milestones": [
  {
   "operator": "generate",
   "request": "Build a site homepage called “Trace Fitness”, with the tagline “Make progress visible”. Put the site name, a “My Class Packs (0)” entry, and a “Total ¥0” in the top bar.\n\nThe filter bar categories are All / Strength / Cardio / Rehab, defaulting to “All”. The class pack list has 20 items in total: Strength 8, Cardio 7, Rehab 5. Each item has a name, its category, a list price, and an “Enroll” button.\n\nList prices are calculated by position: item n = 90 + n × 55. There is also a rule: items with a list price of 450 or more get 20% off, rounded down, and the card must show both the original price and the discounted price."
  },
  {
   "operator": "add state",
   "request": "“Enroll” must actually work: after clicking, the button changes to “Enrolled”, the top-bar count increases by 1, and the top-bar “Total” adds this item's **discounted price**; clicking again cancels and both decrease back. The total must be calculated accurately using discounted prices."
  },
  {
   "operator": "restyle",
   "request": "Add a “Night mode” toggle to the top bar; turning it on switches the whole site to dark mode (darker background, lighter body text). The toggle state must persist after switching categories, and the top-bar count and total must not change because of the theme switch."
  },
  {
   "operator": "restructure layout",
   "request": "Change the class pack list into a grid, with 3 items per row at desktop width. After the change, the list price, discounted price, sorting, selected state, and total must all be identical to before."
  },
  {
   "operator": "remove section",
   "request": "We're dropping the “Rehab” category; remove the category together with those 5 items. After removal, list prices are recalculated by new position (item n = 90 + n × 55), and the discount rule still applies as before."
  }
 ],
 "checklist": [
  {
   "id": "gen.tabs",
   "m": 1,
   "dimension": "visual",
   "w": 1.5,
   "description": "The filter bar has exactly 4 categories: All / Strength / Cardio / Rehab; “All” is selected and distinguishable."
  },
  {
   "id": "gen.total",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "There are 20 items in total under All."
  },
  {
   "id": "gen.price",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "List prices are calculated by position: item 1 is ¥145, item 2 is ¥200, item 6 is ¥420."
  },
  {
   "id": "gen.disc.exact",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "A 20% discount applies at a list price of 450 or above, rounded down: item 6's discounted price is ¥420 (if its list price has not reached the threshold, no discounted price is shown)."
  },
  {
   "id": "gen.disc.boundary",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "Items with a list price below 450 do not show a discounted price; only the original price is shown."
  },
  {
   "id": "gen.split",
   "m": 1,
   "dimension": "functional",
   "w": 1.0,
   "description": "After switching categories, the counts per category are: Strength 8, Cardio 7, Rehab 5."
  },
  {
   "id": "gen.card",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "Each card simultaneously shows the name, category, list price, and an “Enroll” button."
  },
  {
   "id": "gen.header",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "The top bar shows the site name “Trace Fitness”, the “My Class Packs” entry (initially 0), and “Total ¥0”."
  },
  {
   "id": "gen.sel.one",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "At any given moment, exactly one category is selected."
  },
  {
   "id": "st.add1",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Click “Enroll” on item 1; the button changes to “Enrolled”, the count is 1, and the total becomes ¥145."
  },
  {
   "id": "st.add2",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Then select item 6; the count is 2 and the total becomes ¥565 (accumulated using the discounted price)."
  },
  {
   "id": "st.cancel",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Cancel item 6; the count returns to 1 and the total returns to ¥145."
  },
  {
   "id": "st.keep.tab",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After selecting 2 items, switch to “Strength” and back to All; both the count and total remain unchanged."
  },
  {
   "id": "st.sum.uses.disc",
   "m": 2,
   "dimension": "functional",
   "w": 1.5,
   "description": "The total uses discounted prices rather than original prices (for an item that has reached the discount threshold, the increment to the total equals its discounted price)."
  },
  {
   "id": "skin.toggle",
   "m": 3,
   "dimension": "visual",
   "w": 1.5,
   "description": "A “Night mode” toggle exists in the top bar; it is clickable and has two clearly distinct states."
  },
  {
   "id": "skin.dark",
   "m": 3,
   "dimension": "visual",
   "w": 1.5,
   "description": "After turning on Night mode, the background becomes clearly darker and the body text turns light, distinguishable from the daytime state."
  },
  {
   "id": "skin.keep.tab",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After turning on Night mode, switch categories; it is still in the dark state."
  },
  {
   "id": "skin.keep.sum",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Select 2 items first, then toggle Night mode twice; both the count and total remain unchanged."
  },
  {
   "id": "skin.readable",
   "m": 3,
   "dimension": "visual",
   "w": 1.0,
   "description": "In the Night mode state, both the list price and the discounted price are clearly legible."
  },
  {
   "id": "ref.grid3",
   "m": 4,
   "dimension": "visual",
   "w": 1.5,
   "description": "At desktop width, the layout is a grid with exactly 3 items per row."
  },
  {
   "id": "ref.price.same",
   "m": 4,
   "dimension": "functional",
   "w": 1.5,
   "description": "After the restructure, list prices are unchanged: item 1 is ¥145, item 6 is ¥420."
  },
  {
   "id": "ref.disc.same",
   "m": 4,
   "dimension": "functional",
   "w": 1.0,
   "description": "After the restructure, item 6's discounted price is still ¥420."
  },
  {
   "id": "ref.state.same",
   "m": 4,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Select 2 items before the restructure; after the restructure, the count and total are unchanged and those 2 items are still in the selected state."
  },
  {
   "id": "ref.skin.same",
   "m": 4,
   "dimension": "visual",
   "w": 1.0,
   "description": "After the restructure, the Night mode toggle is still usable and the dark state still takes effect."
  },
  {
   "id": "del.gone",
   "m": 5,
   "dimension": "coverage",
   "w": 1.5,
   "description": "The filter bar has only 3 categories left; “Rehab” no longer appears."
  },
  {
   "id": "del.total",
   "m": 5,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under All it becomes 15 items."
  },
  {
   "id": "del.none",
   "m": 5,
   "dimension": "coverage",
   "w": 1.0,
   "description": "Browse the 15 items one by one; none of them belongs to “Rehab”."
  },
  {
   "id": "del.price.recalc",
   "m": 5,
   "dimension": "functional",
   "w": 1.5,
   "description": "List prices are recalculated by new position: item 1 is ¥145, item 6 is ¥420, and the last item (item 15) is ¥915."
  },
  {
   "id": "del.disc.recalc",
   "m": 5,
   "dimension": "functional",
   "w": 1.5,
   "description": "The discount rule still applies to the recalculated list prices: the last item (item 15) has a discounted price of ¥732."
  },
  {
   "id": "del.keep.state",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Before deleting, select 2 items in the retained categories; after deletion, the count and total remain unchanged."
  },
  {
   "id": "del.grid.reflow",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "After deletion, the grid still has 3 items per row; the last row is laid out according to the remaining count, with no empty placeholders."
  },
  {
   "id": "del.combo",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Select 2 items → turn on Night mode → switch to “Strength” → back to All; the count, total, and theme state are all correct at the same time."
  },
  {
   "id": "del.sum.recalc",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After deletion, reselect item 1; the increment to the total equals its recalculated discounted price."
  }
 ],
 "inject": null,
 "qc_static": [],
 "review_status": "hand_authored",
 "hand_notes": {
  "cross_requirement_items": 7,
  "dim_counts": {
   "visual": 10,
   "functional": 11,
   "interaction": 10,
   "coverage": 2
  }
 }
}