{
  "arcs": [
    {
      "arc_id": "antaria_fundamentals",
      "title": "Antaria Fundamentals",
      "theme": "space",
      "difficulty": "easy",
      "concept_ids": ["even_odd", "sequence", "collect_and_reach", "loops_path", "shortest_path"]
    },
    {
      "arc_id": "vault_of_divisors",
      "title": "Vault of Divisors",
      "theme": "bank",
      "difficulty": "medium",
      "concept_ids": ["comparison", "even_odd", "prime_gate", "sequence", "dfs_backtrack"]
    },
    {
      "arc_id": "crystal_algorithms",
      "title": "Crystal Algorithms",
      "theme": "jungle",
      "difficulty": "hard",
      "concept_ids": ["shortest_path", "dfs_backtrack", "palindrome_path", "prime_gate", "collect_and_reach"]
    }
  ],
  "concepts": {
    "even_odd": {
      "id": "even_odd",
      "track": "PF",
      "title": "Even & Odd Tiles",
      "learning_outcome": "Use parity (n % 2) to decide which floor tiles are safe.",
      "description": "Only step on tiles whose number is even. Odd tiles overload Cody's suit!",
      "maze_type": "imperfect",
      "min_dim": 6,
      "max_dim": 9,
      "force_npc": false,
      "force_item": false,
      "maze_rule": { "type": "parity", "pass_if": "even" },
      "hint_template": "Add the row and column mentally — if the tile number is divisible by 2, it's safe."
    },
    "prime_gate": {
      "id": "prime_gate",
      "track": "PF",
      "title": "Prime Gate",
      "learning_outcome": "Recognize prime numbers (only divisible by 1 and itself).",
      "description": "Vault doors show a number. Only prime-numbered doors open!",
      "maze_type": "imperfect",
      "min_dim": 7,
      "max_dim": 10,
      "force_npc": true,
      "force_item": false,
      "maze_rule": { "type": "prime_only" },
      "hint_template": "Primes: 2, 3, 5, 7, 11… Check each labeled tile before stepping."
    },
    "comparison": {
      "id": "comparison",
      "track": "PF",
      "title": "Pick the Greater Path",
      "learning_outcome": "Compare two values and choose the larger (relational operators).",
      "description": "At a split, always take the path marked with the larger number.",
      "maze_type": "imperfect",
      "min_dim": 6,
      "max_dim": 8,
      "force_npc": false,
      "force_item": true,
      "maze_rule": { "type": "max_label_only" },
      "hint_template": "When two numbered tiles branch off, step on the bigger number first."
    },
    "palindrome_path": {
      "id": "palindrome_path",
      "track": "PF",
      "title": "Mirror Path (Palindrome)",
      "learning_outcome": "Understand palindromes — same read forward and backward.",
      "description": "The safe route uses palindrome numbers (like 121, 3, 7).",
      "maze_type": "perfect",
      "min_dim": 8,
      "max_dim": 11,
      "force_npc": true,
      "force_item": true,
      "maze_rule": { "type": "palindrome_only" },
      "hint_template": "A palindrome reads the same both ways: 4, 11, 121 are palindromes; 12 is not."
    },
    "sequence": {
      "id": "sequence",
      "track": "PF",
      "title": "Order Matters (Sequence)",
      "learning_outcome": "Execute steps in the correct order — algorithms are sequential.",
      "description": "Visit the expert FIRST, collect the key SECOND, then reach the exit.",
      "maze_type": "imperfect",
      "min_dim": 7,
      "max_dim": 10,
      "force_npc": true,
      "force_item": true,
      "maze_rule": { "type": "ordered_checkpoints" },
      "hint_template": "Follow the mission checklist top to bottom — skipping a step locks the exit."
    },
    "collect_and_reach": {
      "id": "collect_and_reach",
      "track": "DAA",
      "title": "Collect Before Exit",
      "learning_outcome": "Preconditions: you must gather data before the goal unlocks.",
      "description": "The exit stays locked until you pick up the required item.",
      "maze_type": "imperfect",
      "min_dim": 7,
      "max_dim": 10,
      "force_npc": false,
      "force_item": true,
      "maze_rule": { "type": "ordered_checkpoints" },
      "hint_template": "Grab the item on the path before heading to the finish flag."
    },
    "shortest_path": {
      "id": "shortest_path",
      "track": "DAA",
      "title": "Shortest Route (BFS idea)",
      "learning_outcome": "Among many paths, the fewest steps often wins — breadth-first thinking.",
      "description": "Multiple tunnels exist. Find the route with the fewest moves!",
      "maze_type": "imperfect",
      "min_dim": 8,
      "max_dim": 11,
      "force_npc": false,
      "force_item": true,
      "maze_rule": { "type": "none" },
      "hint_template": "Trace dead ends on paper first — shorter paths avoid unnecessary turns."
    },
    "dfs_backtrack": {
      "id": "dfs_backtrack",
      "track": "DAA",
      "title": "Explore & Backtrack (DFS)",
      "learning_outcome": "When stuck, return to the last junction and try another branch.",
      "description": "Huge maze with dead ends. Explore systematically; backtrack when blocked.",
      "maze_type": "perfect",
      "min_dim": 10,
      "max_dim": 14,
      "force_npc": true,
      "force_item": true,
      "maze_rule": { "type": "none" },
      "hint_template": "Hit a dead end? Reverse to the last fork and choose a new direction."
    },
    "loops_path": {
      "id": "loops_path",
      "track": "PF",
      "title": "Repeat Moves (Loops)",
      "learning_outcome": "Use repeat/loop blocks instead of stacking identical moves.",
      "description": "A long straight corridor — use a loop block instead of many move blocks!",
      "maze_type": "perfect",
      "min_dim": 8,
      "max_dim": 12,
      "force_npc": false,
      "force_item": false,
      "maze_rule": { "type": "none" },
      "hint_template": "Count how many steps in the corridor, then use Repeat × N with one move inside."
    }
  }
}