Swimlane-flow roadmap

Produce a .drawio file with horizontal stage lanes stacked top→bottom: each lane is a colored rounded band of titled unit cards, wired by directional arrows that make learning order explicit. Best when sequence and prerequisites matter.

When to use

• This skill (swimlane) — strict order / prerequisites; each unit has title+subtitle; arrows show "learn A before B". Cleaner for courses.
• drawio-roadmap-snake — poster visual impact; many parallel items per category.

If unsure, ask which they want, or offer to produce both.

Design rules

1. Stage lanes — one rounded rect per stage (rounded=1;strokeWidth=2), full width, stacked top→bottom. A colored lane-header chip on the left holds the stage name + unit count.
2. Stage color gradient — advance top→bottom. Suggested (fill / stroke):
   • Blue #E3F2FD/#1565C0 → Green #E8F5E9/#2E7D32 → Orange #FFF3E0/#E65100
   • Purple #F3E5F5/#6A1B9A → Cyan #E0F7FA/#00838F → Pink #FCE4EC/#AD1457
   • Side-branch (加餐): dashed yellow #FFFDE7/#F9A825
3. Unit cards — white rounded rect rounded=1, value title
subtitle. Core/highlight units get fontStyle=1 (bold) + ⭐ in the title.
4. Directional arrows — use shape=flexArrow;endArrow=classic (thick filled arrow shape, not a thin line). Route from the bottom center of the last card in a lane, down to the midpoint between lanes, then horizontally left to the entry point of the next lane. Each arrow's fillColor uses a light tint of the source lane color; strokeColor=#6c8ebf. Set exitX=0.5;exitY=1 on the source card and entryX=0.25;entryY=0 on the target lane. Provide explicit waypoints in <Array as="points">.
5. Title + legend — big bold title on top; one-line legend explaining solid vs. dashed and ⭐ marks.

Color palette

Build procedure

1. Collect outline: stages (lanes) → ordered units (title, subtitle, core?). If pointed at course dir/spec, derive and confirm lanes + order.
2. Geometry: lane height ≈150, card width 200×70, card gap ≈20, lane start x≈195. Stack lanes with ≈30 vertical gap.
3. Draw lanes (background) → header chips → unit cards → flexArrow arrows (bottom→down→left→top) → optional dashed branches → title + legend.
4. Save to assets/<name>.drawio; give open instructions.
5. Run python3 scripts/validate_drawio.py <file.drawio>. Read references/design-spec.md for exact palette values.

Checklist

• One lane per stage, stacked top→bottom, full width
• Color advances stage by stage (exact hex in design-spec)
• Arrows form a continuous ordered main line across lanes
• Each unit card has title + subtitle; core units bold + ⭐
• Title + legend present
• Valid <mxfile> XML, opens in draw.io without errors