{
 "task_id": "c43",
 "layer": "composite",
 "seed_type": "prd",
 "operators": [
  "generate",
  "make responsive",
  "add state",
  "restructure layout",
  "remove section"
 ],
 "difficulty": "challenging",
 "levers": [
  "state coupling",
  "cross-requirement combined state",
  "exact numeric assertions"
 ],
 "domain": "local services",
 "repair": false,
 "inject_type": null,
 "seed_meta": {
  "authored_by": "hand",
  "materials": "none"
 },
 "title": "Xiangkou Life: local services site from build to narrow-screen collapse and section takedown",
 "milestones": [
  {
   "operator": "generate",
   "request": "Build the homepage of \"Xiangkou Life\", a local services site. Put the site name and a \"My favorites (0)\" in the top bar. Below, an area bar: All city / East / West / South, defaulting to \"All city\".\n\nThe main body is a merchant list, 22 in total: East 8, West 7, South 7. Each needs a shop name, area, rating, per-person price, and a \"Favorite\" button. Ratings start at 4.9 and decrease by 0.1 per shop, and once they reach a minimum of 2.8 they cycle back to 4.9. Per-person price is computed by position: the n-th shop = 30 + n × 5. The list defaults to rating high to low."
  },
  {
   "operator": "make responsive",
   "request": "On narrow screens (browser width around 500px) it has to be viewable: the merchant list goes from multiple columns to a single vertical column; if the area bar doesn't fit, fold it into two rows or tuck it into a dropdown, but all four areas must still be selectable. At desktop width keep it as-is."
  },
  {
   "operator": "add state",
   "request": "Favorites have to actually work. Clicking \"Favorite\" changes it to \"Favorited\" and increments the top-bar count by 1; clicking again cancels it and decrements the count by 1. This state must not be lost after switching area or switching between narrow and wide screens."
  },
  {
   "operator": "restructure layout",
   "request": "Change the merchant list from a long vertical list to a grid: 3 shops per row at desktop width. After the change, the rating sort, per-person prices, and favorite states must be exactly the same as before."
  },
  {
   "operator": "remove section",
   "request": "We're not doing the \"South\" area any more — remove the tab and those 7 merchants together. After removal, per-person prices are recomputed by the new positions (the n-th shop = 30 + n × 5)."
  }
 ],
 "checklist": [
  {
   "id": "gen.areas.four",
   "m": 1,
   "dimension": "visual",
   "w": 1.5,
   "description": "The area bar has exactly 4 tabs: All city / East / West / South, with \"All city\" in the selected state."
  },
  {
   "id": "gen.count.22",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under All city there are exactly 22 merchants."
  },
  {
   "id": "gen.score.desc",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "The default is rating descending: shop 1 is 4.9, shop 2 is 4.8, shop 3 is 4.7."
  },
  {
   "id": "gen.price.rule",
   "m": 1,
   "dimension": "functional",
   "w": 1.5,
   "description": "Per-person price is computed by position: shop 1 is ¥35, shop 2 is ¥40, shop 10 is ¥80."
  },
  {
   "id": "gen.area.split",
   "m": 1,
   "dimension": "functional",
   "w": 1.0,
   "description": "After switching area: East 8, West 7, South 7."
  },
  {
   "id": "gen.card.parts",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "Each merchant card simultaneously shows shop name, area, rating, per-person price, and a \"Favorite\" button."
  },
  {
   "id": "gen.fav.zero",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "The top bar shows the site name \"Xiangkou Life\" and the favorites entry, with an initial count of 0."
  },
  {
   "id": "resp.narrow.single",
   "m": 2,
   "dimension": "visual",
   "w": 1.5,
   "description": "On narrow screens (about 500px wide) merchant cards are in a single vertical column, with no side-by-side two-column arrangement."
  },
  {
   "id": "resp.narrow.areas",
   "m": 2,
   "dimension": "interaction",
   "w": 1.5,
   "description": "On narrow screens the four area tabs can still each be clicked and take effect (possibly wrapped or tucked into a dropdown, but all selectable)."
  },
  {
   "id": "resp.wide.keep",
   "m": 2,
   "dimension": "visual",
   "w": 1.0,
   "description": "After returning to desktop width the layout returns to multiple columns, with no leftover single-column narrow-screen form."
  },
  {
   "id": "resp.narrow.noclip",
   "m": 2,
   "dimension": "visual",
   "w": 1.0,
   "description": "On narrow screens the shop name and per-person price are both fully visible, not clipped or overflowing the screen."
  },
  {
   "id": "st.fav.add",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Clicking \"Favorite\" on shop 1 changes the button to \"Favorited\" and the top-bar count becomes 1."
  },
  {
   "id": "st.fav.three",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Then favoriting shops 2 and 3 makes the top-bar count 3, with all three showing \"Favorited\"."
  },
  {
   "id": "st.fav.cancel",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Clicking shop 2 again returns the button to \"Favorite\" and the count becomes 2."
  },
  {
   "id": "st.fav.keep.area",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After favoriting 3 shops, switching to West and back to All city leaves the top-bar count at 3 and the original three shops still \"Favorited\"."
  },
  {
   "id": "st.fav.keep.resp",
   "m": 3,
   "dimension": "interaction",
   "w": 1.5,
   "description": "After favoriting 3 shops, switching to narrow screen and back to wide screen leaves the top-bar count and each shop's button state unchanged."
  },
  {
   "id": "ref.grid.three",
   "m": 4,
   "dimension": "visual",
   "w": 1.5,
   "description": "At desktop width merchant cards are arranged in a grid with exactly 3 per row."
  },
  {
   "id": "ref.order.same",
   "m": 4,
   "dimension": "functional",
   "w": 1.5,
   "description": "After the restructure the sort is still rating descending, with the first three ratings 4.9 / 4.8 / 4.7 in order."
  },
  {
   "id": "ref.price.same",
   "m": 4,
   "dimension": "functional",
   "w": 1.0,
   "description": "After the restructure shop 1's per-person price is still ¥35 and shop 10's still ¥80."
  },
  {
   "id": "ref.fav.same",
   "m": 4,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Favorite 2 shops before the restructure; after restructuring into a grid the top-bar count is still 2 and those 2 shops are still \"Favorited\"."
  },
  {
   "id": "ref.grid.narrow",
   "m": 4,
   "dimension": "visual",
   "w": 1.0,
   "description": "The grid layout still degrades to a single column on narrow screens, with no horizontal scrollbar."
  },
  {
   "id": "del.south.gone",
   "m": 5,
   "dimension": "coverage",
   "w": 1.5,
   "description": "The area bar has only 3 tabs left, and \"South\" no longer appears."
  },
  {
   "id": "del.count.15",
   "m": 5,
   "dimension": "functional",
   "w": 1.5,
   "description": "Under All city the merchants become 15."
  },
  {
   "id": "del.no.south",
   "m": 5,
   "dimension": "coverage",
   "w": 1.0,
   "description": "Browsing all 15 shops, none belongs to the South area."
  },
  {
   "id": "del.price.recalc",
   "m": 5,
   "dimension": "functional",
   "w": 1.5,
   "description": "Per-person prices are recomputed by the new positions: after deletion shop 1 is ¥35, shop 10 is ¥80, and the last shop (the 15th) is ¥105."
  },
  {
   "id": "del.keep.fav",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Favorite 2 East shops before deletion; after removing South the top-bar count is still 2 and those 2 shops are still \"Favorited\"."
  },
  {
   "id": "del.grid.reflow",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "After deletion the grid still has 3 per row, with the last row arranged by the remaining count and no empty placeholder cells."
  },
  {
   "id": "del.area.recheck",
   "m": 5,
   "dimension": "interaction",
   "w": 1.0,
   "description": "After removing South, switching back and forth twice between East and West, each time the merchant counts are 8 and 7 respectively and the sort is still rating descending."
  },
  {
   "id": "del.combo",
   "m": 5,
   "dimension": "interaction",
   "w": 1.5,
   "description": "Favorite 2 shops → switch to narrow screen → switch to West → return to wide screen, and the top-bar count and favorite states are still correct."
  },
  {
   "id": "c43a.sel.single",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "At any moment only one tab in the filter controls is in the selected state, and the selected state is distinguishable from the unselected state."
  },
  {
   "id": "c43a.info.intact",
   "m": 1,
   "dimension": "visual",
   "w": 1.0,
   "description": "After switching views each card's information is still fully visible, with no text truncation or element overlap."
  },
  {
   "id": "c43b.sel.single",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "At any moment only one tab in the filter controls is in the selected state, and the selected state is distinguishable from the unselected state."
  },
  {
   "id": "c43b.info.intact",
   "m": 5,
   "dimension": "visual",
   "w": 1.0,
   "description": "After switching views each card's information is still fully visible, with no text truncation or element overlap."
  }
 ],
 "inject": null,
 "qc_static": [],
 "review_status": "hand_authored",
 "hand_notes": {
  "cross_requirement_items": 6,
  "dim_counts": {
   "visual": 13,
   "functional": 8,
   "interaction": 10,
   "coverage": 2
  }
 }
}