SlideKit Create

All communication with the user MUST be in Japanese. Questions, confirmations, progress updates, and any other messages — always use Japanese.

Generate HTML files forming a complete presentation deck. Each file is a self-contained HTML document rendered at 1280 x 720 px. All content is pure HTML + CSS. Chart.js is used automatically when data visualizations require it (line charts, radar charts, etc.) — no other JavaScript is permitted.

For DOM snippets and component patterns, see references/patterns.md. For user-provided custom templates, see references/templates/.

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Workflow Overview

Phase	Name	Description
0	テンプレート検出・読み込み	templates/ を確認し、テンプレートモード or 通常モードを決定
1	ヒアリング	モードに応じた質問でスライドの要件を確認
2	デザイン決定	カラーパレット・フォント・アイコンを確定
3	スライド構成の設計	各スライドの役割・レイアウトパターンを計画
4	HTML生成	全スライドを 001.html 〜 NNN.html として出力
5	print.html 生成	全スライド一覧表示用ページを出力
6	チェックリスト確認	制約・品質基準への適合を検証
7	PPTX変換（任意）	/pptx スキルで PowerPoint に変換

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Phase 0: テンプレート検出・読み込み

Before starting the hearing, check references/templates/ for user-provided HTML template files.

0-1. テンプレートの検出

Scan references/templates/ for both subdirectories and loose .html files.

• Subdirectories — each subdirectory is treated as a separate template set (e.g., templates/navy-gold/, templates/modern-tech/)
• Loose HTML files — .html files directly under references/templates/ are treated as a single template set named "default"

If nothing is found (no subdirectories and no HTML files) → proceed to Phase 1 in 通常モード.

0-2. テンプレート選択

If templates are found, present them to the user and ask which to use.

When multiple template sets (subdirectories) exist:

「以下のカスタムテンプレートが見つかりました。どのテンプレートを使用しますか？番号で選択してください。」

1. {directory-name-1}/（{N}ファイル）
2. {directory-name-2}/（{N}ファイル）
3. 使用しない（通常モードで作成）

• 1 or 2 (directory number) → that directory's HTML files become the template set. Proceed to 0-3
• 3 (使用しない) → proceed to Phase 1 in 通常モード

When a single template set exists (one subdirectory, or loose HTML files only):

「以下のカスタムテンプレートが見つかりました。使用しますか？番号で選択してください。」

• {file1.html}, {file2.html}, ...

1. はい — このテンプレートを使用する
2. いいえ — 使用しない（通常モードで作成）

• 1 → proceed to 0-3
• 2 → proceed to Phase 1 in 通常モード

0-3. テンプレート読み込み

Read the selected template files and extract:

• Color palette (CSS custom properties / Tailwind classes)
• Font pair (primary JP + accent Latin)
• Header/footer structure and style
• Decorative elements and visual motifs
• Layout patterns used

Proceed to Phase 1 in テンプレートモード.

Cautions

• Mandatory Constraints still apply. Even if a custom template uses <table> or non-CDN assets, the generated output must follow all rules in the Mandatory Constraints section below. Extract only the visual design (colors, fonts, spacing, decorative style) — not non-compliant implementation details.
• Slide size must remain 1280x720px. Ignore any different dimensions in custom templates.
• Do not copy text content. Custom templates are style references only. All text content comes from Phase 1 hearing.
• Maximum 5 template files per set. If a template set contains more than 5 HTML files, read only the first 5 (sorted alphabetically) to limit context usage. Warn the user that remaining files were skipped.
• Supported format: HTML only. Ignore non-HTML files (images, PDFs, etc.) in the templates directory.

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Phase 1: ヒアリング

Before generating any files, ask the user questions to capture intent. All questions must be asked in Japanese.

Important rules:

• 1ターン1質問: Ask only one question per message. Wait for the user's answer before asking the next question.
• 番号選択: All questions with predefined options must be presented as numbered lists. The user answers by entering the number only. Questions requiring free text input (directory path, title, company name, etc.) are the exception.

The hearing questions differ depending on the mode determined in Phase 0.

テンプレートモード（テンプレートあり）

When custom templates were loaded in Phase 0, skip all design-related questions and ask only the following:

1. 出力ディレクトリ — same as 1-1 below
2. スライド内容のソース — same as 1-4 below
3. プレゼンタイトル — same as 1-5 below
4. スライド枚数 — same as 1-6 below
5. 会社名・ブランド名 — same as 1-7 below
6. テンプレートデザインの確認 — present the extracted design (colors, fonts, decorative style) to the user and ask:

「テンプレートから以下のデザインを検出しました。」

• カラー: {extracted colors}
• フォント: {extracted fonts}
• ヘッダー/フッター: {extracted structure}

「このデザインをどうしますか？番号で選択してください。」

1. そのまま使用する
2. 一部変更したい

• 1 → Phase 2 でテンプレートのデザインをそのまま確定
• 2 → 変更したい項目（カラー、フォント等）を聞き、テンプレートのデザインを部分的に上書き

通常モード（テンプレートなし）

Ask all of the following questions (1-1 through 1-9).

1-1. 出力ディレクトリ

「出力先ディレクトリを選択してください。番号で回答するか、パスを直接入力してください。」

1. デフォルト（output/slide-page{NN}/）
2. パスを指定する

• 1 → use output/slide-page{NN}/ (NN = next sequential number based on existing directories)
• 2 → follow up by asking for the path (text input)
• Direct path input → if the user directly types a path instead of a number, use that path

1-2. スタイル選択

「スタイルを選択してください。番号で回答してください。」

1. Creative — 大胆な配色、装飾要素、グラデーション、遊び心のあるレイアウト
2. Elegant — 落ち着いたパレット（ゴールド系）、セリフ寄りのタイポグラフィ、広めの余白
3. Modern — フラットデザイン、鮮やかなアクセントカラー、シャープなエッジ、テック志向
4. Professional — ネイビー/グレー系、構造的なレイアウト、情報密度高め
5. Minimalist — 少ない色数、極端な余白、タイポグラフィ主導、最小限の装飾

1-3. テーマ選択

「テーマを選択してください。番号で回答してください。」

1. Marketing — 製品発表、キャンペーン提案、市場分析
2. Portfolio — ケーススタディ、実績紹介、作品集
3. Business — 事業計画、経営レポート、戦略提案、投資家ピッチ
4. Technology — SaaS紹介、技術提案、DX推進、AI/データ分析
5. Education — 研修資料、セミナー、ワークショップ、社内勉強会

1-4. スライド内容のソース

Ask the user how they want to provide the content for the slides. This determines what text, data, and structure will appear in the deck.

「スライドの内容をどのように提供しますか？番号で回答してください。」

1. 参考ファイル — ファイル（Markdown、テキスト、Wordなど）を指定する
2. 直接入力 — チャットにテキストを入力する
3. トピックのみ — テーマだけ指定してClaude に内容を生成させる

When a reference file is provided:

1. Read the entire file
2. Extract the logical structure (headings, sections, bullet points, data)
3. Map the structure to the slide sequence — each major section becomes a section divider + content slides
4. Preserve key text, numbers, and data points faithfully
5. Adapt the content to fit the slide format (concise bullet points, not full paragraphs)

When direct text is provided:

1. Organize the text into a logical presentation flow
2. Ask clarifying questions if the structure is ambiguous

When only a topic is given:

1. Ask about the target audience (executives, engineers, clients, etc.)
2. Ask about key messages or points the user wants to convey
3. Generate content based on the answers

1-5. プレゼンタイトル

Ask for the presentation title. Skip if already clear from the content source in 1-4.

1-6. スライド枚数

「スライド枚数を選択してください。番号で回答してください。」

1. 10枚
2. 15枚
3. 20枚（推奨）
4. 25枚
5. 自動（内容に応じて最適な枚数を決定）

• 5（自動） を選択した場合の判断基準:
  • Reference file: count the major sections/headings → each section ≈ 1 divider + 2-3 content slides, plus cover/agenda/summary/closing
  • Direct text: estimate from the volume and structure of the provided text
  • Topic only: default to 15-20 based on topic complexity
• When 5 is selected, inform the user of the determined count before proceeding (e.g., "内容から判断して18枚で作成します。よろしいですか？")

1-7. 会社名・ブランド名

Ask for the company or brand name to display in the header/footer.

1-8. カラーの希望

「カラーに希望はありますか？番号で回答してください。」

1. おまかせ（スタイル × テーマに基づいて自動提案）
2. 指定したい（次の質問でカラーコードや色名を入力）

• 1 → auto-suggest based on the selected style × theme combination
• 2 → follow up by asking for specific color codes or color names (text input)

1-9. 背景画像の使用

「背景画像を使用しますか？番号で回答してください。」

1. 使用しない（CSSグラデーションのみ）
2. 使用する（次の質問で画像を指定）

• 1 → no background images (CSS gradients only)
• 2 → follow up by asking the user to provide or approve specific images

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Phase 2: デザイン決定

Determine the following before generating any HTML:

テンプレートモード

If custom templates were loaded in Phase 0:

1. Color palette — use the palette extracted from the template (or with user-requested modifications from Phase 1)
2. Font pair — use the fonts extracted from the template (or with user-requested modifications from Phase 1)
3. Brand icon (1 Font Awesome icon)

If the user confirmed the template design as-is in Phase 1, present a brief summary and proceed. If the user requested partial changes, apply those changes and present the updated design for confirmation.

通常モード

Based on Phase 1 hearing results, determine:

1. Color palette (3-4 custom colors)
2. Font pair (1 Japanese + 1 Latin)
3. Brand icon (1 Font Awesome icon)

Present the design decisions to the user for confirmation before proceeding.

Proven Palette Examples

Template	Style	Primary Dark	Accent	Secondary	Fonts
01 Navy & Gold	Elegant	#0F2027	#C5A065	#2C5364	Noto Sans JP + Lato
02 Casual Biz	Professional	#1f2937	Indigo	#F97316	Noto Sans JP
03 Blue & Orange	Professional	#333333	#007BFF	#F59E0B	BIZ UDGothic
04 Green Forest	Modern	#1B4332	#40916C	#52B788	Noto Sans JP + Inter
05 Dark Tech	Creative	#0F172A	#F97316	#3B82F6	Noto Sans JP + Inter

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Phase 3: スライド構成の設計

Plan the full deck structure before writing any HTML. This phase produces a slide map.

3-1. Required Slides (All Decks)

Position	Type	Pattern	Category
First	Cover	Center	cover
Second	Agenda	HBF	agenda
Second to last	Summary	HBF	conclusion
Last	Closing	Full-bleed / Center	conclusion

3-2. Section Dividers by Slide Count

Slides	Section Dividers	Content Slides
10	2	4
15	3	8
20	4	12
25	5	16

3-3. Build the Slide Map

For each slide, determine:

1. File number (001.html, 002.html, ...)
2. Type (Cover / Agenda / Section Divider / Content / Summary / Closing)
3. Layout pattern (from the 43 patterns — see Phase 4 reference)
4. Content summary (what text/data goes on this slide)

Rules:

• Never use the same layout pattern for 3 or more consecutive slides
• Match content from Phase 1-3 (reference file / text / topic) to appropriate slide types
• Use good variety across the 43 layout patterns
• Chart.js auto-detection: For slides with data visualizations, decide whether to use Chart.js or CSS-only based on the "When to Use Chart.js vs CSS-Only" table in references/patterns.md. Mark Chart.js slides in the slide map. CSS-only and Chart.js charts can coexist in the same deck

3-4. Standard Composition for 20 Slides (Reference)

File	Type	Pattern	Purpose
001.html	Cover	Center	Title, subtitle, presenter, date
002.html	Agenda	HBF	Numbered section list
003.html	Section Divider 1	Left-Right Split	Section 1 introduction
004.html	Content	HBF + Top-Bottom Split	Challenges vs. solutions + KPI
005.html	Content	HBF + 2-Column	Comparison / contrast
006.html	Section Divider 2	Left-Right Split	Section 2 introduction
007.html	Content	HBF + 3-Column	3-item cards
008.html	Content	HBF + Grid Table	Competitive comparison table
009.html	Content	HBF + 2x2 Grid	Risk analysis / SWOT
010.html	Section Divider 3	Left-Right Split	Section 3 introduction
011.html	Content	HBF + N-Column	Process flow
012.html	Content	HBF + Timeline/Roadmap	Quarterly roadmap
013.html	Content	HBF + KPI Dashboard	KPI cards + CSS bar chart
014.html	Section Divider 4	Left-Right Split	Section 4 introduction
015.html	Content	HBF + Funnel	Conversion funnel
016.html	Content	HBF + Vertical Stack	Architecture / org chart
017.html	Content	HBF + 3-Column	Strategy / policy (3 pillars)
018.html	Content	HBF + 2-Column	Detailed analysis / data
019.html	Summary	HBF	Key takeaways + next actions
020.html	Closing	Full-bleed / Center	Thank-you slide + contact info

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Phase 4: HTML生成

Generate all slide HTML files based on the slide map from Phase 3.

4-1. For Each Slide

1. Use the HTML Boilerplate (below)
2. Apply the design decisions from Phase 2 (colors, fonts, icon)
3. Use the layout pattern assigned in Phase 3
4. Fill in the content from Phase 1-3 (reference file / text / generated)
5. If the slide is marked "Chart.js" in the slide map: use Chart.js <canvas> patterns from references/patterns.md (Chart.js Patterns section). Include the Chart.js CDN <script> in <head> and initialization <script> before </body>
6. Save as {output_dir}/{NNN}.html (zero-padded: 001.html, 002.html, ...)

HTML Boilerplate

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="utf-8" />
    <meta content="width=device-width, initial-scale=1.0" name="viewport" />
    <title>{Slide Title}</title>
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet" />
    <link href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.4.0/css/all.min.css" rel="stylesheet" />
    <link href="https://fonts.googleapis.com/css2?family={PrimaryFont}:wght@300;400;500;700;900&family={AccentFont}:wght@400;600;700&display=swap" rel="stylesheet" />
    <!-- Chart.js (only on slides marked "Chart.js" in Phase 3) -->
    <!-- <script src="https://cdn.jsdelivr.net/npm/chart.js"></script> -->
    <style>
        body { margin: 0; padding: 0; font-family: '{PrimaryFont}', sans-serif; overflow: hidden; }
        .font-accent { font-family: '{AccentFont}', sans-serif; }
        .slide { width: 1280px; height: 720px; position: relative; overflow: hidden; background: #FFFFFF; }
        /* Custom color classes: .bg-brand-dark, .bg-brand-accent, .bg-brand-warm, etc. */
    </style>
</head>
<body>
    <div class="slide {layout-classes}">
        <!-- Content -->
    </div>
    <!-- Chart.js initialization (only on slides that contain charts) -->
    <!-- <script> new Chart(...) </script> -->
</body>
</html>

Chart.js CDN inclusion rules:

• Only uncomment the <script src="...chart.js..."> line on slides marked "Chart.js" in the Phase 3 slide map
• Only add the Chart.js CDN to slides that actually contain a <canvas> chart — do not include it on every slide
• The <script> for Chart initialization must be placed just before </body>, after the slide <div>
• Each chart <canvas> must have a unique id attribute

43 Layout Patterns

Use one pattern per slide. For full DOM trees and component snippets, see references/patterns.md.

#	Pattern	Root classes	When to use
1	Center	flex flex-col items-center justify-center	Cover, thank-you slides
2	Left-Right Split	flex with w-1/3 + w-2/3	Chapter dividers, concept + detail
3	Header-Body-Footer	flex flex-col with header + flex-1 + footer	Most content slides (default)
4	HBF + 2-Column	Pattern 3 body with two w-1/2	Comparison, data + explanation
5	HBF + 3-Column	Pattern 3 body with grid grid-cols-3	Card listings, 3-way comparison
6	HBF + N-Column	Pattern 3 body with grid grid-cols-{N}	Process flows (max 5 cols)
7	Full-bleed	relative with absolute inset-0 layers	Impact covers (CSS gradient default)
8	HBF + Top-Bottom Split	Pattern 3 body with flex flex-col two sections	Content top + KPI/summary bar bottom
9	HBF + Timeline/Roadmap	Pattern 3 body with timeline bar + grid grid-cols-4	Quarterly roadmaps, phased plans
10	HBF + KPI Dashboard	Pattern 3 body with KPI grid + flex-1 chart area	KPI cards + chart/progress visualization
11	HBF + Grid Table	Pattern 3 body with flex-based rows (w-1/N)	Feature comparison, competitive analysis
12	HBF + Funnel	Pattern 3 body with decreasing-width centered bars	Conversion funnel, sales pipeline
13	HBF + Vertical Stack	Pattern 3 body with stacked full-width cards + separators	Architecture diagrams, layered systems
14	HBF + 2x2 Grid	Pattern 3 body with grid grid-cols-2 (2 rows)	Risk analysis, SWOT, feature overview
15	HBF + Stacked Cards	Pattern 3 body with vertically stacked full-width cards + numbered badges	FAQ, Q&A, numbered key points, interview summary
16	HBF + TAM/SAM/SOM	Pattern 3 body with description list + nested circles or horizontal bars	Market size visualization (2 variants)
17	Chapter Divider	flex with w-1/4 dark + w-3/4 light (no HBF)	Chapter/section dividers with large number
18	HBF + Contact	Pattern 3 body with w-1/2 message + w-1/2 contact card	Contact info, CTA slides
19	HBF + 5-Column Process	Pattern 3 body with grid grid-cols-5 + optional RACI box	5-step process flows, methodology
20	HBF + VS Comparison	Pattern 3 body with two cards + central VS badge	Head-to-head competitor comparison
21	Section End / Summary	flex flex-col with numbered key points + accent border	Section closing, key takeaways
22	Table of Contents	flex flex-col with numbered agenda items + active highlight	Agenda, table of contents
23	HBF + 2×3 Grid	Pattern 3 body with grid grid-cols-3 grid-rows-2	6-element overview, feature grid
24	HBF + Icon List	Pattern 3 body with icon circles + text rows	Feature lists, benefit highlights
25	HBF + Image Header Panel	Pattern 3 body with image-topped cards	Visual category cards
26	HBF + Emphasis Panel	Pattern 3 body with left-border accent panels	Key message emphasis, callouts
27	Glass Panel (Dark)	relative dark bg + backdrop-blur glass panels	Premium dark-theme content
28	HBF + Gradient Panel	Pattern 3 body with gradient-bg panels	Highlighted content sections
29	HBF + Card Layout with Image	Pattern 3 body with icon + description cards	Service/product feature cards
30	Right-Side Background Image	flex with text left + image right (w-2/5)	Text + supporting image
31	Quote Slide	flex flex-col items-center justify-center with large quotation marks	Inspirational quotes, testimonials
32	Multiple Images Split	flex with multiple image panels side by side	Photo gallery, visual comparison
33	Statistics Emphasis	Pattern 3 body with large stat numbers + labels	KPI highlights, data callouts
34	Center Message	flex flex-col items-center justify-center with single message	Key statement, transition message
35	Q&A Slide	Centered large "Q&A" text with subtitle	Question & answer session
36	Question Slide	Centered question mark with audience prompt	Audience engagement, reflection
37	Movie / Book Quote	flex with dark accent bar + quote + attribution	Famous quotes, literary references
38	HBF + Inline Image	Pattern 3 body with image + numbered text items	Image-supported explanations
39	HBF + Statistics Ratio	Pattern 3 body with vertical bar chart comparison	Ratio visualization, benchmarks
40	HBF + Text + Stats Panel	Pattern 3 body with text block + stat cards	Mixed narrative + data
41	Summary Glass Vertical	Dark bg + vertical glass panels with key points	Premium summary, dark-theme recap
42	HBF + Simple List + Supplement	Pattern 3 with bullet list (60%) + supplement panel (40%)	Lists with additional context
43	HBF + Case Study	Pattern 3 with challenge → solution → result flow	Company case studies, success stories

Heading Convention

Bilingual: small English label above, larger Japanese title below.

<p class="text-xs uppercase tracking-widest text-gray-400 mb-1 font-accent">Market Analysis</p>
<h1 class="text-3xl font-bold text-brand-dark">市場分析</h1>

Number Emphasis Convention

Large digits + small unit span:

<p class="text-4xl font-black font-accent">415<span class="text-sm font-normal ml-1">M</span></p>

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Phase 5: print.html 生成

After all slide HTML files are generated, create {output_dir}/print.html for viewing and printing all slides:

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="utf-8" />
    <title>View for Print</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { background: #FFFFFF; }
        .slide-frame {
            width: 1280px; height: 720px;
            margin: 20px auto;
            box-shadow: 0 2px 10px rgba(0,0,0,0.15);
            border: 1px solid #e2e8f0;
            overflow: hidden;
        }
        .slide-frame iframe { width: 1280px; height: 720px; border: none; }
        @media print {
            body { background: #FFFFFF; }
            .slide-frame {
                page-break-after: always; box-shadow: none; border: none;
                margin: 0 auto;
                transform: scale(0.85); transform-origin: top center;
            }
        }
    </style>
</head>
<body>
    <!-- One iframe per slide -->
    <div class="slide-frame"><iframe src="001.html"></iframe></div>
    <!-- ... repeat for all slides ... -->
</body>
</html>

Add one <div class="slide-frame"><iframe src="{NNN}.html"></iframe></div> per slide.

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Phase 6: チェックリスト確認

After Phase 4 and Phase 5 are complete, verify the following. Fix any issues before delivering to the user.

• All files use identical CDN links
• Custom colors defined identically in every <style>
• Root is single <div> under <body> with overflow: hidden (only sibling allowed: Chart.js <script> on chart slides)
• Slide size exactly 1280 x 720
• No external images (unless user approved)
• No JavaScript except Chart.js on chart slides (no other <script> tags allowed)
• All files for the chosen slide count are present
• Font sizes follow hierarchy
• Consistent header/footer on content slides
• Page numbers increment correctly
• Confidential in footer
• Decorative elements use low z-index and low opacity
• File naming: zero-padded 3 digits (001.html, 002.html, ...)
• Text uses <p> / <h*> (not <div>)
• No visible text in ::before / ::after
• No one-off colors outside palette
• Content density guidelines followed
• print.html generated with iframes for all slides

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Phase 7: PPTX変換（任意）

After all checks pass, ask the user in Japanese:

「HTMLスライドの生成が完了しました。PowerPoint（PPTX）に変換しますか？」

If the user declines, the workflow ends here.

Prerequisite Check

Before invoking the pptx skill, verify it is available by checking the list of available skills in the current session. The pptx skill will appear in the system's skill list if installed.

If the pptx skill is NOT available, inform the user and provide installation instructions:

/pptx スキルが必要ですが、現在インストールされていません。

以下のコマンドでインストールできます:

claude install-skill https://github.com/anthropics/claude-code-agent-skills/tree/main/skills/pptx

インストール後、新しいセッションで /pptx を実行し、出力ディレクトリ {output_dir} を指定してください。

Then end the workflow. Do not attempt conversion without the pptx skill.

Chart.js Slides and PPTX Conversion

When the deck contains Chart.js <canvas> charts (determined in Phase 3):

1. Chart slides require screenshot-based conversion. The pptx converter cannot parse <canvas> elements rendered by JavaScript. Chart.js charts will be captured as raster images (PNG) and embedded in the PPTX slide
2. Non-chart elements remain editable. Text, icons, and CSS-only elements on the same slide are still extracted as native PPTX objects
3. Inform the pptx skill which slides contain Chart.js so it can apply the screenshot fallback selectively

Invocation (pptx skill available)

If the pptx skill is available, invoke /pptx using the Skill tool. Pass the following context:

1. Source directory — the output path containing all NNN.html files
2. Slide count — total number of HTML files
3. Presentation title — from Phase 1 hearing
4. Color palette — the 3-4 brand colors chosen in Phase 2
5. Font pair — primary (JP) and accent (Latin) fonts

Example invocation prompt for the Skill tool:

Convert the HTML slide deck in {output_dir} to a single PPTX file.
- {N} slides (001.html through {NNN}.html)
- Title: {title}
- Colors: {primary_dark}, {accent}, {secondary}
- Fonts: {primary_font} + {accent_font}
- Chart.js slides: {list of slide numbers, e.g., "004, 013" or "none"}
- Output: {output_dir}/presentation.pptx

Important: Do not attempt HTML-to-PPTX conversion yourself. Always delegate to the /pptx skill, which has its own specialized workflow, QA process, and conversion tools.

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Reference: Mandatory Constraints

Rule	Value
Slide size	width: 1280px; height: 720px
CSS framework	Tailwind CSS 2.2.19 via CDN
Icons	Font Awesome 6.4.0 via CDN
Fonts	Google Fonts (1 JP primary + 1 Latin accent)
Language	lang="ja"
Root DOM	<body> -> single wrapper <div> (only sibling allowed: Chart.js <script> on chart slides)
Overflow	overflow: hidden on root wrapper
External images	None by default. Explicit user approval required
JavaScript	Forbidden by default. Exception: Chart.js is used automatically when data visualizations require it (see Phase 3 auto-detection). No other JS libraries permitted
Custom CSS	Inline <style> in <head> only; no external CSS files

PPTX Conversion Rules (Critical)

These directly affect PPTX conversion accuracy. Always follow.

• Prefer <p> over <div> for text (tree-walkers may miss <div> text)
• Never put visible text in ::before / ::after
• Separate decorative elements with -z-10 / z-0
• Max DOM nesting: 5-6 levels
• Font Awesome icons in <i> tags (converter detects fa- on <i>)
• Use flex-based tables over <table>
• linear-gradient(...) supported; complex multi-stop may fall back to screenshot
• box-shadow, border-radius, opacity all extractable
• Chart.js <canvas> elements are not parseable by DOM tree-walkers → require screenshot fallback for PPTX. Prefer CSS-only charts when PPTX editability is a priority

Anti-Patterns (Avoid)

• Purposeless wrapper <div>s (increases nesting)
• One-off colors outside the palette
• <table> for layout
• Inline styles that Tailwind can replace
• Text in ::before / ::after
• <div> for text (use <p>, <h1>-<h6>)

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Reference: Design Guidelines

Color Palette

Define 3-4 custom colors as Tailwind-style utility classes in <style>:

Role	Class Example	Purpose
Primary Dark	.bg-brand-dark	Dark backgrounds, titles
Primary Accent	.bg-brand-accent	Borders, highlights, icons
Warm/Secondary	.bg-brand-warm	CTAs, emphasis, badges
Body text	Tailwind grays	Body, captions

Keep palette consistent across all slides. No one-off colors.

Font Pair

Role	Examples	Usage
Primary (JP)	Noto Sans JP, BIZ UDGothic	Body, headings
Accent (Latin)	Lato, Inter, Roboto	Numbers, English labels, page numbers

Set primary on body; define .font-accent for the accent font.

Font Size Hierarchy

Purpose	Tailwind class
Main title	text-3xl - text-6xl + font-bold/font-black
Section heading	text-xl - text-2xl + font-bold
Card heading	text-lg + font-bold
Body text	text-sm - text-base
Caption/label	text-xs

Content Density Guidelines

Element	Recommended Max
Bullet points	5-6
Cards per row	3-4
Body text lines	6-8
KPI boxes	4-6
Process steps	4-5