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MODEL: GPT-5.4-codex
REASONING: high COMMAND: Create BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY as one focused, testable PR. Rules: - one PR purpose only - refine the existing shared tool shell only - no legacy styling as the baseline - keep CSS Grid for the primary shell - no embedded <style> in HTML - no inline style="" - no JS-generated styling - keep theme under src/engine/theme - do not redesign tools Required work: 1. Refine the shared tool-shell CSS to improve density. 2. Replace fixed left/right rail widths with responsive clamp() sizing where appropriate. 3. Reduce shell/panel spacing where safe and align to the shared spacing system. 4. Avoid horizontal scrolling at normal desktop widths. 5. Reduce vertical scrolling where practical. 6. Apply and validate the refined shell against the tools already migrated to the shared shell. 7. Update MASTER_ROADMAP_STYLE.md: - append STYLE_08 checklist only - do not delete existing text - do not rewrite existing text - update completion markers only if execution-backed 8. Package to: <project folder>/tmp/BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY.zip
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‎docs/dev/reports/style_08_planning_note.txt‎

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STYLE_08 planning note
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Goal:
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- make tools denser and reduce scrolling without changing the shared shell architecture
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Primary levers:
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- clamp-based rail sizing
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- tighter shell spacing
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- tighter panel spacing
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- preserve readable usability
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Roadmap handling:
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- append STYLE_08 only
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- do not delete or rewrite existing roadmap text
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- update completion markers only when earned

‎docs/dev/roadmaps/MASTER_ROADMAP_STYLE.md‎

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[x] `src/engine/theme/tool-shell.css` provides fixed left/right + flexible center shell
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[x] Migrated tool page keeps script wiring unchanged (`platformShell.js`, `main.js`)
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[x] No embedded `<style>` or inline `style=""` added in migrated tool page
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### STYLE_08 — Adaptive Tool Density
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[x] Shared tool-shell CSS refined for denser layout
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[x] Left/right rails use responsive `clamp()` sizing where appropriate
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[x] Shell-level spacing reduced where safe
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[x] Panel-level spacing reduced where safe
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[x] Horizontal scrolling avoided at normal desktop widths for migrated shell tools
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[x] Vertical scrolling reduced where practical in migrated shell tools
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[x] Refined shell validated against migrated shell tools:
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- `tools/State Inspector/index.html`
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- `tools/Performance Profiler/index.html`
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- `tools/Replay Visualizer/index.html`
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- `tools/Physics Sandbox/index.html`

‎docs/operations/dev/codex_commands.md‎

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REASONING: high
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COMMAND:
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Create BUILD_PR_STYLE_06_TOOL_SHELL_FOUNDATION_AND_FIRST_TOOL_MIGRATION as one focused, testable PR.
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Create BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY as one focused, testable PR.
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Rules:
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- one PR purpose only
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- use the new shared theme direction
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- refine the existing shared tool shell only
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- no legacy styling as the baseline
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- keep CSS Grid for the primary shell
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- no embedded <style> in HTML
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- no inline style=""
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- no JS-generated styling
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- keep theme under src/engine/theme
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- migrate one tool only
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- do not redesign tools
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Required work:
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1. Add shared tool-shell styling under src/engine/theme.
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2. Establish a full-width tool page layout:
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- fixed left rail
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- flexible center
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- fixed right rail
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3. Migrate one tool page to use the shared shell.
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4. Keep the migrated tool visually testable and functional.
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5. Update MASTER_ROADMAP_STYLE.md by ADDING a STYLE_06 test section only.
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1. Refine the shared tool-shell CSS to improve density.
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2. Replace fixed left/right rail widths with responsive clamp() sizing where appropriate.
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3. Reduce shell/panel spacing where safe and align to the shared spacing system.
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4. Avoid horizontal scrolling at normal desktop widths.
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5. Reduce vertical scrolling where practical.
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6. Apply and validate the refined shell against the tools already migrated to the shared shell.
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7. Update MASTER_ROADMAP_STYLE.md:
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- append STYLE_08 checklist only
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- do not delete existing text
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- do not rewrite existing text
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6. Package to:
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<project folder>/tmp/BUILD_PR_STYLE_06_TOOL_SHELL_FOUNDATION_AND_FIRST_TOOL_MIGRATION.zip
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- update completion markers only if execution-backed
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8. Package to:
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<project folder>/tmp/BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY.zip

‎docs/operations/dev/commit_comment.txt‎

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Create the shared tool-shell foundation and migrate one tool as the first proof slice.
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Refine the shared tool shell for adaptive density.
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Establish full-width tool layout with fixed left/right rails and a flexible center workspace.
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Keep the PR narrow, testable, and aligned with the new style system.
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Use clamp-based rail sizing, reduce excess spacing, and improve tool usability with less scrolling while preserving the shared CSS Grid shell.
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PR: BUILD_PR_STYLE_06_TOOL_SHELL_FOUNDATION_AND_FIRST_TOOL_MIGRATION
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PR: BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY

‎docs/pr/BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY.md‎

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# BUILD_PR_STYLE_08_ADAPTIVE_TOOL_DENSITY
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## Purpose
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Tighten the shared tool shell so tools use space more efficiently and avoid scrolling where practical, without redesigning the shell architecture.
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## Single PR Purpose
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Improve tool density and responsive rail sizing on top of the existing shared tool shell.
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## Scope
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- refine the shared tool-shell CSS only
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- apply the refined shell to the tools already using the shared shell
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- reduce excess padding, gaps, and oversized rails where safe
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- avoid horizontal scrolling at normal desktop widths
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- reduce vertical scrolling where practical
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- keep the change narrow and testable
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## Required Rules
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1. Reuse the existing shared tool shell from STYLE_06 / STYLE_07.
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2. Do not redesign tools or add new features.
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3. Keep CSS Grid as the shell layout.
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4. No embedded `<style>` blocks.
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5. No inline `style=""`.
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6. No JS-generated styling.
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7. Keep theme/layout work under `src/engine/theme/`.
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## Required Density Changes
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### Rail sizing
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- Replace fixed left/right rail widths with responsive `clamp()` sizing where appropriate.
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- Keep:
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- left rail narrower but still usable
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- center as the primary flexible region
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- right rail usable for properties/readouts
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- Do not let rails become unusably small.
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### Spacing
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- Reduce excessive shell gaps if present.
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- Reduce excessive panel padding if present.
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- Align all density changes to the shared spacing system.
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### Scrolling
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- Avoid horizontal scrolling at normal desktop widths.
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- Reduce vertical scrolling where practical, especially for inspector/debug-style tools.
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- Prefer better sizing and density over adding scrollbars.
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- If scrolling remains necessary, keep it localized and justified.
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## Validation Focus
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Use the existing migrated tool set as validation targets, including tools with:
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- left-side action controls
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- center textareas/canvas/workspace
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- right-side output/readout panels
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## Acceptance
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- shared tool shell remains CSS Grid based
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- rail sizing becomes more adaptive
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- tools feel denser and more usable
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- horizontal scrolling remains avoided at normal desktop widths
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- vertical scrolling is reduced where practical
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- no embedded styling remains on migrated tool pages
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- migrated tools remain functional
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- change is visually testable

‎src/engine/theme/tool-shell.css‎

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}
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.tool-shell-page .tool-shell-container {
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width: min(1800px, calc(100% - 24px));
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margin: 0 auto 16px;
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width: min(1800px, calc(100% - 20px));
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margin: 0 auto 12px;
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display: grid;
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gap: 14px;
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gap: 10px;
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}
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.tool-shell {
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display: grid;
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grid-template-columns: 280px minmax(0, 1fr) 340px;
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gap: 14px;
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grid-template-columns: clamp(220px, 20vw, 272px) minmax(0, 1fr) clamp(260px, 24vw, 328px);
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gap: 10px;
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align-items: start;
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}
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.tool-shell__right {
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min-width: 0;
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display: grid;
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gap: 14px;
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gap: 10px;
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}
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.tool-shell .panel,
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.tool-shell .debug-tool-panel,
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.tool-shell .debug-tool-readout {
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min-width: 0;
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overflow-wrap: anywhere;
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}
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.tool-shell textarea,
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.tool-shell input,
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.tool-shell select {
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width: 100%;
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max-width: 100%;
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}
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.tool-shell__left {
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width: 280px;
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width: clamp(220px, 20vw, 272px);
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}
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.tool-shell__right {
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width: 340px;
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width: clamp(260px, 24vw, 328px);
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}
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@media (max-width: 1180px) {
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.tool-shell {
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grid-template-columns: 260px minmax(0, 1fr) 300px;
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}
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.tool-shell__left {
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width: 260px;
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}
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.tool-shell .panel,
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.tool-shell .debug-tool-panel {
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padding: clamp(9px, 1.05vw, 12px);
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}
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.tool-shell__right {
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width: 300px;
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}
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.tool-shell .debug-tool-readout {
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max-height: min(58vh, 460px);
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@media (max-width: 980px) {
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.tool-shell-page .tool-shell-container {
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width: min(100%, calc(100% - 16px));
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.tool-shell {

‎tools/Performance Profiler/index.html‎

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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Performance Profiler</title>
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<link rel="stylesheet" href="../../src/engine/theme/main.css" />
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<link rel="stylesheet" href="../../src/engine/ui/hubCommon.css" />
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<link rel="stylesheet" href="../shared/platformShell.css" />
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<link rel="stylesheet" href="../shared/debugInspectorTools.css" />
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</head>
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<body class="tools-platform-tool-page" data-tool-id="performance-profiler" data-tools-platform-page="tool">
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<body class="tools-platform-tool-page tool-shell-page" data-tool-id="performance-profiler" data-tools-platform-page="tool">
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<div data-tools-platform-header></div>
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<div class="debug-tool-shell app-shell">
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<section class="panel debug-tool-panel">
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<h2>Performance Profiler</h2>
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<p>Run baseline deterministic workload and frame cadence sampling to inspect timing health.</p>
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<button type="button" id="runWorkloadButton">Run Workload Profile</button>
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<button type="button" id="runFrameSampleButton">Run Frame Sample</button>
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<button type="button" id="stopProfilerButton">Stop</button>
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</div>
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<div id="profilerStatusText" class="debug-tool-meta">Profiler ready.</div>
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</section>
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<div class="tool-shell-container">
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<div class="tool-shell app-shell">
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<aside class="tool-shell__left">
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<section class="panel debug-tool-panel">
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<h2>Performance Profiler</h2>
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<p>Run baseline deterministic workload and frame cadence sampling to inspect timing health.</p>
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<div class="debug-tool-actions">
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<button type="button" id="runWorkloadButton">Run Workload Profile</button>
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<button type="button" id="runFrameSampleButton">Run Frame Sample</button>
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<button type="button" id="stopProfilerButton">Stop</button>
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</div>
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<div id="profilerStatusText" class="debug-tool-meta">Profiler ready.</div>
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</section>
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</aside>
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<section class="panel debug-tool-panel">
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<h3>Profile Settings</h3>
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<label>
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Workload iterations
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<input id="workloadIterationsInput" type="number" min="10" max="5000" step="10" value="300" />
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</label>
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Work size per iteration
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<input id="workSizeInput" type="number" min="100" max="100000" step="100" value="3000" />
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</label>
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Frame samples
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<input id="frameSamplesInput" type="number" min="10" max="600" step="10" value="120" />
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</section>
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<main class="tool-shell__center">
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<section class="panel debug-tool-panel">
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<h3>Profile Settings</h3>
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<label>
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Workload iterations
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<input id="workloadIterationsInput" type="number" min="10" max="5000" step="10" value="300" />
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</label>
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<label>
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Work size per iteration
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<input id="workSizeInput" type="number" min="100" max="100000" step="100" value="3000" />
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</label>
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<label>
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Frame samples
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<input id="frameSamplesInput" type="number" min="10" max="600" step="10" value="120" />
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</label>
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</section>
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</main>
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<h3>Profile Output</h3>
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<pre id="profileOutput" class="debug-tool-readout">Run a workload or frame sample to inspect performance metrics.</pre>
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</section>
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</section>
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<aside class="tool-shell__right">
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<section class="panel debug-tool-panel">
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<h3>Profile Output</h3>
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<pre id="profileOutput" class="debug-tool-readout">Run a workload or frame sample to inspect performance metrics.</pre>
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</section>
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</aside>
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</div>
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<div data-tools-platform-status></div>
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<script type="module" src="../shared/platformShell.js"></script>

‎tools/Physics Sandbox/index.html‎

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<meta charset="UTF-8" />
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<title>Physics Sandbox</title>
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<link rel="stylesheet" href="../../src/engine/theme/main.css" />
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<link rel="stylesheet" href="../../src/engine/ui/hubCommon.css" />
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<link rel="stylesheet" href="../shared/platformShell.css" />
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<link rel="stylesheet" href="../shared/debugInspectorTools.css" />
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<body class="tools-platform-tool-page" data-tool-id="physics-sandbox" data-tools-platform-page="tool">
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<body class="tools-platform-tool-page tool-shell-page" data-tool-id="physics-sandbox" data-tools-platform-page="tool">
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<div class="debug-tool-shell app-shell">
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<section class="panel debug-tool-panel">
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<h2>Physics Sandbox</h2>
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<p>Preview reusable physics helpers for acceleration, drag, and velocity integration.</p>
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<div class="debug-tool-actions">
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<button type="button" id="runPhysicsStepButton">Run Step</button>
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<div id="physicsSandboxStatus" class="debug-tool-meta">Sandbox ready.</div>
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<div class="tool-shell-container">
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<div class="tool-shell app-shell">
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<aside class="tool-shell__left">
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<section class="panel debug-tool-panel">
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<h2>Physics Sandbox</h2>
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<p>Preview reusable physics helpers for acceleration, drag, and velocity integration.</p>
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<div class="debug-tool-actions">
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<button type="button" id="runPhysicsStepButton">Run Step</button>
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</div>
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<div id="physicsSandboxStatus" class="debug-tool-meta">Sandbox ready.</div>
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<h3>Body Input</h3>
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<textarea id="physicsBodyInput" rows="14" placeholder='{"x":0,"y":0,"velocityX":100,"velocityY":0,"accelerationX":-10,"dragX":12}'></textarea>
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<main class="tool-shell__center">
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<section class="panel debug-tool-panel">
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<h3>Body Input</h3>
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<textarea id="physicsBodyInput" rows="14" placeholder='{"x":0,"y":0,"velocityX":100,"velocityY":0,"accelerationX":-10,"dragX":12}'></textarea>
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</section>
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</main>
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<h3>Step Output</h3>
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<pre id="physicsSandboxOutput" class="debug-tool-readout">Run a step to inspect updated body state.</pre>
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<aside class="tool-shell__right">
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<section class="panel debug-tool-panel">
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<h3>Step Output</h3>
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<pre id="physicsSandboxOutput" class="debug-tool-readout">Run a step to inspect updated body state.</pre>
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</section>
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</aside>
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</div>
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<div data-tools-platform-status></div>
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<script type="module" src="../shared/platformShell.js"></script>

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