{
 "task_id": "c44",
 "layer": "composite",
 "seed_type": "prd",
 "operators": [
  "generate",
  "make responsive",
  "add section",
  "wire up data",
  "make interactive"
 ],
 "difficulty": "challenging",
 "levers": [
  "state coupling",
  "cross-requirement combined state",
  "exact numeric assertions"
 ],
 "domain": "education courses",
 "repair": false,
 "inject_type": null,
 "seed_meta": {
  "authored_by": "hand",
  "materials": "none"
 },
 "title": "LevelUp Classroom: From Site Build to Lesson-Fee Recalculation and High-Rating Filtering",
 "milestones": [
  {
   "operator": "generate",
   "request": "Build a site homepage called “LevelUp Classroom”, with the tagline “Every lesson, fully explained”. Put the site name and a “My Plan (0)” entry in the top bar.\n\nBelow that is a filter bar whose categories are fixed as All / Coding / Design / Languages, defaulting to “All”. The main body is a course list with 21 items in total, distributed as: Coding 8, Design 7, Languages 6.\n\nEach item must have a name, its category, a lesson fee, and an “Add to Plan” button. Lesson fees are assigned by position: item n = 120 + n × 30. Each item also has a rating; item 1 is 4.9, and each subsequent item is 0.1 lower than the previous one. The list is sorted by rating from high to low by default."
  },
  {
   "operator": "add state",
   "request": "“Add to Plan” must actually work. After clicking, the button changes to “Added” and the “My Plan” count in the top bar increases by 1; clicking again cancels it and the count decreases by 1. This count and each item's button state must not be lost after switching categories."
  },
  {
   "operator": "wire up data",
   "request": "Add a summary line below the filter bar: “N items · Total lesson fees M”. N is the number of items under the current category, and M is the sum of the lesson fees of those items; it must update when switching categories, and the numbers must be calculated accurately."
  },
  {
   "operator": "remove section",
   "request": "We're dropping the “Languages” category; remove the category together with those 6 items. After removal, lesson fees are recalculated by new position (item n = 120 + n × 30), and the summary line must update accordingly."
  },
  {
   "operator": "make interactive",
   "request": "Add a “High ratings only” toggle to the filter bar; when on, only items with a rating of at least 4.6 are shown. The toggle state must persist after switching categories, and the top-bar count must not change before or after toggling the filter."
  }
 ],
 "checklist": [
  {
   "id": "gen.tabs",
   "m": 1,
   "dimension": "visual",
   "w": 1.5,
   "description": "The filter bar has exactly 4 categories, with the text, in order: All / Coding / Design / Languages; “All” is selected and distinguishable from the other categories."
  },
  {
   "id": "gen.total",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under the All category, the total number of courses is 21."
  },
  {
   "id": "gen.val.desc",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "By default sorted by rating in descending order: item 1 is 4.9, item 2 is 4.8, item 3 is 4.7."
  },
  {
   "id": "gen.extra.rule",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "Lesson fees are calculated by position: item 1 is 150, item 2 is 180, item 5 is 270."
  },
  {
   "id": "gen.split",
   "m": 1,
   "dimension": "functional",
   "w": 1.0,
   "description": "After switching categories, the counts per category are: Coding 8, Design 7, Languages 6."
  },
  {
   "id": "gen.card",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "Each card simultaneously shows the name, category, lesson fee, rating, and an “Add to Plan” button."
  },
  {
   "id": "gen.header",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "The top bar shows the site name “LevelUp Classroom”, the tagline “Every lesson, fully explained”, and the “My Plan” entry, with an initial count of 0."
  },
  {
   "id": "gen.sel.one",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "At any given moment, exactly one category in the filter bar is selected."
  },
  {
   "id": "st.add1",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Click “Add to Plan” on item 1; the button changes to “Added” and the top-bar count is 1."
  },
  {
   "id": "st.add3",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Then do the same for items 2 and 3; the top-bar count is 3 and all three items show “Added”."
  },
  {
   "id": "st.cancel",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Click item 2 again; the button returns to “Add to Plan” and the top-bar count is 2."
  },
  {
   "id": "st.keep.tab",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After acting on 3 items, switch to “Coding” and back to All; the top-bar count is still 3 and the original three items still show “Added”."
  },
  {
   "id": "st.no.dup",
   "m": 2,
   "dimension": "interaction",
   "w": 1.0,
   "description": "Click the same item twice in a row; the net change in count is 0 (no duplicate counting)."
  },
  {
   "id": "st.badge.visible",
   "m": 2,
   "dimension": "visual",
   "w": 1.0,
   "description": "The top-bar count number updates visibly immediately after the action, without refreshing the page."
  },
  {
   "id": "data.sum.all",
   "m": 3,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under All, the summary line shows “21 items”, and the total lesson fees equal the sum of the 21 items, with exact numbers."
  },
  {
   "id": "data.sum.tab",
   "m": 3,
   "dimension": "functional",
   "w": 1.5,
   "description": "Switch to “Coding”; the item count in the summary line becomes 8, and the total equals the sum of that category's items."
  },
  {
   "id": "data.sum.pos",
   "m": 3,
   "dimension": "visual",
   "w": 1.0,
   "description": "The summary line is located below the filter bar, with wording of the form “N items · Total lesson fees M”."
  },
  {
   "id": "data.sum.switch",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Switch back and forth twice between two different categories; the item count and total in the summary line match the current category each time."
  },
  {
   "id": "data.sum.keep.state",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Act on 2 items first, then switch categories; the summary line changes with the category while the top-bar count remains 2."
  },
  {
   "id": "del.tab.gone",
   "m": 4,
   "dimension": "coverage",
   "w": 1.5,
   "description": "The filter bar has only 3 categories left; “Languages” no longer appears."
  },
  {
   "id": "del.total",
   "m": 4,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under All, the total becomes 15 items."
  },
  {
   "id": "del.none.left",
   "m": 4,
   "dimension": "coverage",
   "w": 1.0,
   "description": "Browse the 15 items one by one; no item's category is “Languages”."
  },
  {
   "id": "del.extra.recalc",
   "m": 4,
   "dimension": "functional",
   "w": 1.5,
   "description": "Lesson fees are recalculated by new position: item 1 is 150, item 5 is 270, and the last item (item 15) is 570."
  },
  {
   "id": "del.sum.update",
   "m": 4,
   "dimension": "functional",
   "w": 1.5,
   "description": "The summary line updates in sync to “15 items”, and the total equals the sum of the 15 recalculated items."
  },
  {
   "id": "del.keep.state",
   "m": 4,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Before deleting, act on 2 items in the retained categories; after deleting “Languages”, the top-bar count is still 2 and those 2 items still show “Added”."
  },
  {
   "id": "int.toggle.exists",
   "m": 5,
   "dimension": "visual",
   "w": 1.5,
   "description": "A “High ratings only” toggle exists near the filter bar; it is clickable and has clearly distinct on/off states."
  },
  {
   "id": "int.toggle.filter",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After turning on “High ratings only”, every item in the list has a rating of at least 4.6; all items below that value are invisible."
  },
  {
   "id": "int.toggle.off",
   "m": 5,
   "dimension": "interaction",
   "w": 1.0,
   "description": "After turning the toggle off, the list returns to 15 items."
  },
  {
   "id": "int.toggle.keep.tab",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After turning on “High ratings only”, switch categories; the toggle is still in the on state (not reset)."
  },
  {
   "id": "int.count.keep",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After acting on 2 items, toggle “High ratings only” on and off twice in a row; the top-bar count is always 2."
  },
  {
   "id": "int.combo.all",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Act on 2 items → switch to “Coding” → turn on High ratings only → switch back to All; the top-bar count, summary line, and toggle state are all correct at the same time."
  },
  {
   "id": "int.layout.ok",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "After toggling the filter, card information remains fully visible, with no text truncation or element overlap."
  },
  {
   "id": "int.sum.with.filter",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "After enabling the filter, the summary line is still visible and not empty."
  }
 ],
 "inject": null,
 "qc_static": [],
 "review_status": "hand_authored",
 "hand_notes": {
  "cross_requirement_items": 7,
  "dim_counts": {
   "visual": 9,
   "functional": 9,
   "interaction": 13,
   "coverage": 2
  }
 }
}