Presentation Builder

Name: Presentation Builder
Author: yonatangross

yonatangross/skillforge-claude-plugin

16 installs
213 repo stars
Updated August 4, 2026
yonatangross/skillforge-claude-plugin

Helps with ai & agent building tasks.

About

presentation-builder is a Claude Code skill for ai & agent building. It helps solo builders move faster with AI-assisted coding.

presentation-builder
AI & Agent Building
AI-coding skill

Presentation Builder by the numbers

16 all-time installs (skills.sh)
Ranked #11,068 of 16,546 AI & Agent Building skills by installs in the Skillselion catalog
Data as of Aug 5, 2026 (Skillselion catalog sync)

npx skills add https://github.com/yonatangross/skillforge-claude-plugin --skill presentation-builder

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Installs	16
repo stars	★ 213
Last updated	August 4, 2026
Repository	yonatangross/skillforge-claude-plugin ↗

What it does

Helps with ai & agent building tasks.

Files

SKILL.mdMarkdownGitHub ↗

Presentation Builder

Create zero-dependency, animation-rich HTML presentations that run entirely in the browser.

Based on zarazhangrui/frontend-slides, restructured for OrchestKit.

Core Philosophy

1. Zero Dependencies -- Single HTML files with inline CSS/JS. No npm, no build tools. 2. Show, Don't Tell -- Generate visual previews, not abstract choices. People discover preferences by seeing. 3. Distinctive Design -- Avoid generic "AI slop" aesthetics. Every presentation should feel custom-crafted. 4. Production Quality -- Well-commented, accessible, performant code. 5. Viewport Fitting -- Every slide MUST fit exactly within the viewport. No scrolling within slides, ever.

Phase 0: Detect Mode

Determine what the user wants:

Mode	Trigger	Next Phase
A: New Presentation	Create slides from scratch	Phase 1
B: PPT Conversion	Has a .ppt/.pptx file	Load `Read("${CLAUDE_SKILL_DIR}/references/pptx-conversion.md")` then Phase 2
C: Enhancement	Has existing HTML presentation	Read file, understand structure, enhance

---

Phase 1: Content Discovery

Before designing, understand the content. Use AskUserQuestion:

Question 1: Purpose

Header: "Purpose"
Options: "Pitch deck", "Teaching/Tutorial", "Conference talk", "Internal presentation"

Question 2: Slide Count

Header: "Length"
Options: "Short (5-10)", "Medium (10-20)", "Long (20+)"

Question 3: Content Readiness

Header: "Content"
Options: "I have all content ready", "I have rough notes", "I have a topic only"

If user has content, ask them to share it. If topic only, help structure an outline.

---

Phase 2: Style Discovery

This is the "show, don't tell" phase.

Step 2.0: Style Path Selection

Ask how the user wants to choose their style:

"Show me options" -- Generate 3 previews based on mood (recommended)
"I know what I want" -- Pick from preset list directly

Available Presets (load Read("${CLAUDE_SKILL_DIR}/references/style-presets.md") for full details):

Preset	Vibe	Best For
Bold Signal	Confident, high-impact	Pitch decks, keynotes
Electric Studio	Clean, professional	Agency presentations
Creative Voltage	Energetic, retro-modern	Creative pitches
Dark Botanical	Elegant, sophisticated	Premium brands
Notebook Tabs	Editorial, organized	Reports, reviews
Pastel Geometry	Friendly, approachable	Product overviews
Split Pastel	Playful, modern	Creative agencies
Vintage Editorial	Witty, personality-driven	Personal brands
Neon Cyber	Futuristic, techy	Tech startups
Terminal Green	Developer-focused	Dev tools, APIs
Swiss Modern	Minimal, precise	Corporate, data
Paper & Ink	Literary, thoughtful	Storytelling

Step 2.1: Mood Selection (Guided Discovery)

If "Show me options", ask via AskUserQuestion:

Question: Vibe

"What feeling should the audience have?"
Options (multiSelect: true, pick up to 2):
"Impressed/Confident" -- Professional, trustworthy
"Excited/Energized" -- Innovative, bold
"Calm/Focused" -- Clear, easy to follow
"Inspired/Moved" -- Emotional, memorable

Mood-to-Style Mapping:

Mood	Suggested Styles
Impressed/Confident	Bold Signal, Electric Studio, Dark Botanical
Excited/Energized	Creative Voltage, Neon Cyber, Split Pastel
Calm/Focused	Notebook Tabs, Paper & Ink, Swiss Modern
Inspired/Moved	Dark Botanical, Vintage Editorial, Pastel Geometry

Step 2.2: Generate Style Previews

Generate 3 distinct mini HTML files in .claude-design/slide-previews/:

.claude-design/slide-previews/
├── style-a.html   # ~50-100 lines, single title slide
├── style-b.html
└── style-c.html

Each preview: self-contained, inline CSS/JS, animated title slide showing typography, colors, and motion style.

Step 2.3: Present Previews

Show user the 3 options and ask via AskUserQuestion:

"Which style preview do you prefer?"
Options: Style A, Style B, Style C, "Mix elements"

---

Phase 3: Generate Presentation

Generate the full presentation based on content (Phase 1) and style (Phase 2).

File Output

presentation.html    # Self-contained presentation
assets/              # Images if any (PPT conversion)

HTML Architecture

Every presentation follows this structure:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Presentation Title</title>
    <!-- Fonts from Fontshare or Google Fonts -->
    <style>
        /* Theme variables in :root */
        /* Base styles + viewport fitting (see rules/viewport-fitting.md) */
        /* Slide container styles */
        /* Animations */
        /* Responsive breakpoints */
    </style>
</head>
<body>
    <div class="progress-bar"></div>
    <nav class="nav-dots"><!-- JS generated --></nav>
    <section class="slide title-slide">...</section>
    <section class="slide">...</section>
    <!-- More slides -->
    <script>
        /* SlidePresentation class with navigation */
    </script>
</body>
</html>

Critical: Viewport Fitting

Every slide MUST fit exactly in the viewport. Load: Read("${CLAUDE_SKILL_DIR}/rules/viewport-fitting.md")

Quick checklist:

Every .slide has height: 100vh; height: 100dvh; overflow: hidden;
All font sizes use clamp(min, preferred, max)
All spacing uses clamp() or viewport units
Content respects density limits (load ${CLAUDE_SKILL_DIR}/rules/content-density.md)
Breakpoints exist for heights: 700px, 600px, 500px
When content doesn't fit: split into multiple slides, never scroll

Also see responsive-patterns skill for advanced clamp()/container query patterns.

Required JavaScript Features

1. SlidePresentation Class -- Keyboard (arrows, space), touch/swipe, mouse wheel, progress bar, nav dots 2. Intersection Observer -- Add .visible class on scroll for CSS animations 3. Optional enhancements (style-dependent): Custom cursor, particle backgrounds, parallax, 3D tilt, magnetic buttons

Code Quality

Every CSS/JS section has clear comments explaining what, why, and how to modify
Semantic HTML (<section>, <nav>, <main>)
Keyboard navigation works
ARIA labels where needed
Reduced motion support: @media (prefers-reduced-motion: reduce)

Anti-Patterns (DO NOT USE)

Fonts: Inter, Roboto, Arial, system fonts as display
Colors: #6366f1 (generic indigo), purple gradients on white
Layouts: Everything centered, generic hero sections, identical card grids
Decorations: Realistic illustrations, gratuitous glassmorphism

---

Phase 4: Delivery

1. Clean up .claude-design/slide-previews/ if it exists 2. Open the presentation: open [filename].html 3. Provide summary:

Your presentation is ready!

File: [filename].html
Style: [Style Name]
Slides: [count]

Navigation:
- Arrow keys or Space to navigate
- Scroll/swipe also works
- Click dots on the right to jump

To customize:
- Colors: :root CSS variables at top
- Fonts: Change the font link
- Animations: Modify .reveal class timings

---

Style Reference: Effect-to-Feeling Mapping

Feeling	Animation Style	Visual Approach
Dramatic/Cinematic	Slow fade-ins (1-1.5s), large scale transitions	Dark BG, spotlight effects, parallax
Techy/Futuristic	Neon glow, glitch/scramble text	Particle systems, grid patterns, monospace accents
Playful/Friendly	Bouncy easing, floating animations	Pastel/bright colors, rounded corners
Professional/Corporate	Subtle fast animations (200-300ms)	Clean sans-serif, navy/slate, data viz focus
Calm/Minimal	Very slow subtle motion	High whitespace, muted palette, serif typography
Editorial/Magazine	Strong typography hierarchy	Pull quotes, grid-breaking layouts, B&W + accent

---

Troubleshooting

Issue	Solution
Fonts not loading	Check Fontshare/Google Fonts URL, verify font names match CSS
Animations not triggering	Verify Intersection Observer is running, check `.visible` class
Scroll snap not working	Ensure `scroll-snap-type` on html, `scroll-snap-align` on slides
Mobile issues	Disable heavy effects at 768px, test touch events, reduce particles
Performance	Use `will-change` sparingly, prefer `transform`/`opacity` animations

---

Related Skills

ork:responsive-patterns -- Advanced clamp(), container queries, responsive breakpoints
ork:accessibility -- WCAG 2.2 compliance, keyboard navigation, ARIA patterns
ork:ui-components -- shadcn/ui and Radix component patterns
ork:demo-producer -- Terminal recording and video demos

Rules

Load on demand with Read("${CLAUDE_SKILL_DIR}/rules/<file>"):

File	Content
`viewport-fitting.md`	Mandatory CSS for viewport-locked slides
`content-density.md`	Maximum content per slide type

References

Load on demand with Read("${CLAUDE_SKILL_DIR}/references/<file>"):

File	Content
`style-presets.md`	12 curated visual themes with CSS variables
`pptx-conversion.md`	PowerPoint extraction and conversion workflow

PPT/PPTX Conversion

When converting PowerPoint files to HTML presentations.

Step 1: Extract Content

Use Python with python-pptx to extract slides, text, and images:

from pptx import Presentation
from pptx.util import Inches, Pt
import json
import os
import base64

def extract_pptx(file_path, output_dir):
    """Extract all content from a PowerPoint file."""
    prs = Presentation(file_path)
    slides_data = []

    assets_dir = os.path.join(output_dir, 'assets')
    os.makedirs(assets_dir, exist_ok=True)

    for slide_num, slide in enumerate(prs.slides):
        slide_data = {
            'number': slide_num + 1,
            'title': '',
            'content': [],
            'images': [],
            'notes': ''
        }

        for shape in slide.shapes:
            if shape.has_text_frame:
                if shape == slide.shapes.title:
                    slide_data['title'] = shape.text
                else:
                    slide_data['content'].append({
                        'type': 'text',
                        'content': shape.text
                    })

            if shape.shape_type == 13:  # Picture
                image = shape.image
                image_bytes = image.blob
                image_ext = image.ext
                image_name = f"slide{slide_num + 1}_img{len(slide_data['images']) + 1}.{image_ext}"
                image_path = os.path.join(assets_dir, image_name)

                with open(image_path, 'wb') as f:
                    f.write(image_bytes)

                slide_data['images'].append({
                    'path': f"assets/{image_name}",
                    'width': shape.width,
                    'height': shape.height
                })

        if slide.has_notes_slide:
            notes_frame = slide.notes_slide.notes_text_frame
            slide_data['notes'] = notes_frame.text

        slides_data.append(slide_data)

    return slides_data

Step 2: Confirm Content Structure

Present extracted content to user for verification:

I've extracted the following from your PowerPoint:

Slide 1: [Title]
- [Content summary]
- Images: [count]

Slide 2: [Title]
...

All images saved to assets folder. Does this look correct?

Step 3: Style Selection

Proceed to Phase 2 (Style Discovery) in the main workflow with the extracted content in mind.

Step 4: Generate HTML

Convert extracted content into the chosen style, preserving:

All text content and slide order
All images (referenced from assets/ folder)
Speaker notes as HTML comments or separate file

Notes

python-pptx must be installed: pip install python-pptx
Images are extracted as-is (no re-encoding)
Complex shapes (SmartArt, charts) may need manual recreation
Grouped shapes are flattened -- check output for missing content

Style Presets Reference

12 curated visual styles for presentations. Each preset is inspired by real design references. Abstract shapes only -- no illustrations.

Dark Themes

1. Bold Signal

Vibe: Confident, bold, modern, high-impact

Layout: Colored card on dark gradient. Number top-left, navigation top-right.

Typography: Archivo Black (900) + Space Grotesk (400/500)

:root {
    --bg-primary: #1a1a1a;
    --bg-gradient: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 50%, #1a1a1a 100%);
    --card-bg: #FF5722;
    --text-primary: #ffffff;
    --text-on-card: #1a1a1a;
}

Signature: Bold colored card as focal point, large section numbers, navigation breadcrumbs.

---

2. Electric Studio

Vibe: Bold, clean, professional, high contrast

Layout: Split panel -- white top, blue bottom. Brand marks in corners.

Typography: Manrope (800) + Manrope (400/500)

:root {
    --bg-dark: #0a0a0a;
    --bg-white: #ffffff;
    --accent-blue: #4361ee;
    --text-dark: #0a0a0a;
    --text-light: #ffffff;
}

Signature: Two-panel vertical split, accent bar on edge, quote typography as hero element.

---

3. Creative Voltage

Vibe: Bold, creative, energetic, retro-modern

Layout: Split panels -- electric blue left, dark right. Script accents.

Typography: Syne (700/800) + Space Mono (400/700)

:root {
    --bg-primary: #0066ff;
    --bg-dark: #1a1a2e;
    --accent-neon: #d4ff00;
    --text-light: #ffffff;
}

Signature: Electric blue + neon yellow contrast, halftone textures, neon badges, script typography.

---

4. Dark Botanical

Vibe: Elegant, sophisticated, artistic, premium

Layout: Centered content on dark. Abstract soft shapes in corner.

Typography: Cormorant (400/600) + IBM Plex Sans (300/400)

:root {
    --bg-primary: #0f0f0f;
    --text-primary: #e8e4df;
    --text-secondary: #9a9590;
    --accent-warm: #d4a574;
    --accent-pink: #e8b4b8;
    --accent-gold: #c9b896;
}

Signature: Abstract soft gradient circles, warm color accents (pink, gold), thin vertical lines, italic signature typography. No illustrations.

---

Light Themes

5. Notebook Tabs

Vibe: Editorial, organized, elegant, tactile

Layout: Cream paper card on dark background. Colorful tabs on right edge.

Typography: Bodoni Moda (400/700) + DM Sans (400/500)

:root {
    --bg-outer: #2d2d2d;
    --bg-page: #f8f6f1;
    --text-primary: #1a1a1a;
    --tab-1: #98d4bb; /* Mint */
    --tab-2: #c7b8ea; /* Lavender */
    --tab-3: #f4b8c5; /* Pink */
    --tab-4: #a8d8ea; /* Sky */
    --tab-5: #ffe6a7; /* Cream */
}

Signature: Paper container with shadow, colorful section tabs on right (vertical text), binder holes on left. Tab text scales: font-size: clamp(0.5rem, 1vh, 0.7rem).

---

6. Pastel Geometry

Vibe: Friendly, organized, modern, approachable

Layout: White card on pastel background. Vertical pills on right edge.

Typography: Plus Jakarta Sans (700/800) + Plus Jakarta Sans (400/500)

:root {
    --bg-primary: #c8d9e6;
    --card-bg: #faf9f7;
    --pill-pink: #f0b4d4;
    --pill-mint: #a8d4c4;
    --pill-sage: #5a7c6a;
    --pill-lavender: #9b8dc4;
    --pill-violet: #7c6aad;
}

Signature: Rounded card with soft shadow, vertical pills on right edge with varying heights.

---

7. Split Pastel

Vibe: Playful, modern, friendly, creative

Layout: Two-color vertical split (peach left, lavender right).

Typography: Outfit (700/800) + Outfit (400/500)

:root {
    --bg-peach: #f5e6dc;
    --bg-lavender: #e4dff0;
    --text-dark: #1a1a1a;
    --badge-mint: #c8f0d8;
    --badge-yellow: #f0f0c8;
    --badge-pink: #f0d4e0;
}

Signature: Split background colors, playful badge pills with icons, grid pattern overlay.

---

8. Vintage Editorial

Vibe: Witty, confident, editorial, personality-driven

Layout: Centered content on cream. Abstract geometric shapes as accent.

Typography: Fraunces (700/900) + Work Sans (400/500)

:root {
    --bg-cream: #f5f3ee;
    --text-primary: #1a1a1a;
    --text-secondary: #555;
    --accent-warm: #e8d4c0;
}

Signature: Abstract geometric shapes (circle outline + line + dot), bold bordered CTA boxes, witty conversational tone. No illustrations.

---

Specialty Themes

9. Neon Cyber

Vibe: Futuristic, techy, confident

Typography: Clash Display + Satoshi (Fontshare)

Colors: Deep navy (#0a0f1c), cyan accent (#00ffcc), magenta (#ff00aa)

Signature: Particle backgrounds, neon glow, grid patterns

---

10. Terminal Green

Vibe: Developer-focused, hacker aesthetic

Typography: JetBrains Mono (monospace only)

Colors: GitHub dark (#0d1117), terminal green (#39d353)

Signature: Scan lines, blinking cursor, code syntax styling

---

11. Swiss Modern

Vibe: Clean, precise, Bauhaus-inspired

Typography: Archivo (800) + Nunito (400)

Colors: Pure white, pure black, red accent (#ff3300)

Signature: Visible grid, asymmetric layouts, geometric shapes

---

12. Paper & Ink

Vibe: Editorial, literary, thoughtful

Typography: Cormorant Garamond + Source Serif 4

Colors: Warm cream (#faf9f7), charcoal (#1a1a1a), crimson accent (#c41e3a)

Signature: Drop caps, pull quotes, elegant horizontal rules

---

Font Pairing Quick Reference

Preset	Display Font	Body Font	Source
Bold Signal	Archivo Black	Space Grotesk	Google
Electric Studio	Manrope	Manrope	Google
Creative Voltage	Syne	Space Mono	Google
Dark Botanical	Cormorant	IBM Plex Sans	Google
Notebook Tabs	Bodoni Moda	DM Sans	Google
Pastel Geometry	Plus Jakarta Sans	Plus Jakarta Sans	Google
Split Pastel	Outfit	Outfit	Google
Vintage Editorial	Fraunces	Work Sans	Google
Neon Cyber	Clash Display	Satoshi	Fontshare
Terminal Green	JetBrains Mono	JetBrains Mono	JetBrains
Swiss Modern	Archivo	Nunito	Google
Paper & Ink	Cormorant Garamond	Source Serif 4	Google

DO NOT USE (Generic AI Patterns)

Fonts: Inter, Roboto, Arial, system fonts as display
Colors: #6366f1 (generic indigo), purple gradients on white
Layouts: Everything centered, generic hero sections, identical card grids
Decorations: Realistic illustrations, gratuitous glassmorphism, drop shadows without purpose

Content Density Rules

To guarantee viewport fitting, enforce these limits per slide type.

Maximum Content Per Slide

Slide Type	Maximum Content
Title slide	1 heading + 1 subtitle + optional tagline
Content slide	1 heading + 4-6 bullet points OR 1 heading + 2 paragraphs
Feature grid	1 heading + 6 cards maximum (2x3 or 3x2 grid)
Code slide	1 heading + 8-10 lines of code maximum
Quote slide	1 quote (max 3 lines) + attribution
Image slide	1 heading + 1 image (max 60vh height)

Rules

1. If content exceeds these limits, split into multiple slides. Never scroll. 2. Each bullet point should be 1-2 lines maximum. 3. Code slides should show focused snippets, not full files. 4. Feature grids use auto-fit with minmax() -- stack vertically on narrow screens. 5. Images always have max-height constraints using min(50vh, 400px) or similar.

Incorrect:

<!-- 12 bullet points crammed onto one slide -->
<div class="slide">
  <h2>Features</h2>
  <ul><li>Point 1</li>...<li>Point 12</li></ul>  <!-- overflows viewport -->
</div>

Correct:

<!-- Split into two slides of 6 each -->
<div class="slide"><h2>Features (1/2)</h2><ul><li>1</li>...<li>6</li></ul></div>
<div class="slide"><h2>Features (2/2)</h2><ul><li>7</li>...<li>12</li></ul></div>

When to Split

More than 6 bullet points -> split into "Part 1" / "Part 2"
Code longer than 10 lines -> split by logical section or use a "highlights" approach
More than 6 feature cards -> use multiple grid slides
A quote longer than 3 lines -> shorten or attribute on a separate line

Viewport Fitting Rules

Every slide MUST fit exactly within the viewport. No scrolling within slides, ever. This is non-negotiable.

The Golden Rule

Each slide = exactly one viewport height (100vh/100dvh)
Content overflows? -> Split into multiple slides or reduce content
Never scroll within a slide.

Incorrect:

.slide {
    min-height: 100vh;  /* allows overflow beyond viewport */
    overflow: auto;      /* enables scrolling within slide */
}

Correct:

.slide {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;    /* CRITICAL: no scrolling */
    scroll-snap-align: start;
}

Required CSS Architecture

Every presentation MUST include this base CSS:

/* ============================================
   VIEWPORT FITTING: MANDATORY BASE STYLES
   ============================================ */

/* 1. Lock html/body to viewport */
html, body {
    height: 100%;
    overflow-x: hidden;
}

html {
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

/* 2. Each slide = exact viewport height */
.slide {
    width: 100vw;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile browsers */
    overflow: hidden; /* CRITICAL: Prevent ANY overflow */
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 3. Content container with flex for centering */
.slide-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-height: 100%;
    overflow: hidden; /* Double-protection against overflow */
    padding: var(--slide-padding);
}

/* 4. ALL typography uses clamp() for responsive scaling */
:root {
    --title-size: clamp(1.5rem, 5vw, 4rem);
    --h2-size: clamp(1.25rem, 3.5vw, 2.5rem);
    --h3-size: clamp(1rem, 2.5vw, 1.75rem);
    --body-size: clamp(0.75rem, 1.5vw, 1.125rem);
    --small-size: clamp(0.65rem, 1vw, 0.875rem);
    --slide-padding: clamp(1rem, 4vw, 4rem);
    --content-gap: clamp(0.5rem, 2vw, 2rem);
    --element-gap: clamp(0.25rem, 1vw, 1rem);
}

/* 5. Cards/containers use viewport-relative max sizes */
.card, .container, .content-box {
    max-width: min(90vw, 1000px);
    max-height: min(80vh, 700px);
}

/* 6. Lists auto-scale with viewport */
.feature-list, .bullet-list {
    gap: clamp(0.4rem, 1vh, 1rem);
}

.feature-list li, .bullet-list li {
    font-size: var(--body-size);
    line-height: 1.4;
}

/* 7. Grids adapt to available space */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: clamp(0.5rem, 1.5vw, 1rem);
}

/* 8. Images constrained to viewport */
img, .image-container {
    max-width: 100%;
    max-height: min(50vh, 400px);
    object-fit: contain;
}

Responsive Breakpoints

/* Short viewports (< 700px height) */
@media (max-height: 700px) {
    :root {
        --slide-padding: clamp(0.75rem, 3vw, 2rem);
        --content-gap: clamp(0.4rem, 1.5vw, 1rem);
        --title-size: clamp(1.25rem, 4.5vw, 2.5rem);
        --h2-size: clamp(1rem, 3vw, 1.75rem);
    }
}

/* Very short viewports (< 600px height) */
@media (max-height: 600px) {
    :root {
        --slide-padding: clamp(0.5rem, 2.5vw, 1.5rem);
        --content-gap: clamp(0.3rem, 1vw, 0.75rem);
        --title-size: clamp(1.1rem, 4vw, 2rem);
        --body-size: clamp(0.7rem, 1.2vw, 0.95rem);
    }
    .nav-dots, .keyboard-hint, .decorative { display: none; }
}

/* Extremely short - landscape phones (< 500px height) */
@media (max-height: 500px) {
    :root {
        --slide-padding: clamp(0.4rem, 2vw, 1rem);
        --title-size: clamp(1rem, 3.5vw, 1.5rem);
        --h2-size: clamp(0.9rem, 2.5vw, 1.25rem);
        --body-size: clamp(0.65rem, 1vw, 0.85rem);
    }
}

/* Narrow viewports (< 600px width) */
@media (max-width: 600px) {
    :root { --title-size: clamp(1.25rem, 7vw, 2.5rem); }
    .grid { grid-template-columns: 1fr; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.2s !important;
    }
    html { scroll-behavior: auto; }
}

Overflow Prevention Checklist

Before generating any presentation, verify:

1. Every .slide has height: 100vh; height: 100dvh; overflow: hidden; 2. All font sizes use clamp(min, preferred, max) 3. All spacing uses clamp() or viewport units 4. Content containers have max-height constraints 5. Images have max-height: min(50vh, 400px) or similar 6. Grids use auto-fit with minmax() for responsive columns 7. Breakpoints exist for heights: 700px, 600px, 500px 8. No fixed pixel heights on content elements 9. Content per slide respects density limits (see content-density.md)

When Content Doesn't Fit

DO:

Split into multiple slides
Reduce bullet points (max 5-6 per slide)
Shorten text (aim for 1-2 lines per bullet)
Use smaller code snippets
Create a "continued" slide

DON'T:

Reduce font size below readable limits
Remove padding/spacing entirely
Allow any scrolling
Cram content to fit

Testing Viewport Fit

Recommend testing at these sizes:

Desktop: 1920x1080, 1440x900, 1280x720
Tablet: 1024x768, 768x1024 (portrait)
Mobile: 375x667, 414x896
Landscape phone: 667x375, 896x414

{
  "skill": "presentation-builder",
  "version": "1.0.0",
  "testCases": [
    {
      "id": "basic-create-an-html-presentation",
      "rule": "",
      "query": "Create an HTML presentation for my conference talk about building real-time collaborative editors",
      "expectedBehavior": [
        "Claude runs Phase 1 content discovery: asks purpose, slide count, and content readiness via AskUserQuestion",
        "Runs Phase 2 style discovery: asks for mood/vibe selection, generates 3 style preview HTML files in .claude-design/slide-previews/",
        "Generates a single self-contained HTML file with inline CSS and JS, no external dependencies",
        "Every slide uses height: 100vh with overflow: hidden (viewport fitting)",
        "Includes SlidePresentation class with keyboard, touch, and scroll navigation",
        "Opens the final HTML file in the browser"
      ]
    },
    {
      "id": "edge-convert-my-existing-quarterlyreviewpptx",
      "rule": "",
      "query": "Convert my existing quarterly-review.pptx file into a web presentation",
      "expectedBehavior": [
        "Claude detects Mode B (PPT Conversion) from the .pptx file reference",
        "Follows the PPTX conversion reference workflow to extract content",
        "Proceeds to Phase 2 for style selection after extraction",
        "Generates a self-contained HTML file preserving the original slide content",
        "Creates an assets/ directory for any extracted images"
      ]
    },
    {
      "id": "negative-write-unit-tests-for",
      "rule": "",
      "query": "Write unit tests for the UserService class in our Node.js backend",
      "expectedBehavior": [
        "Claude does NOT invoke the presentation-builder skill",
        "Uses standard testing patterns (Jest, Vitest, etc.) instead",
        "No HTML file generation, style previews, or slide-related output"
      ]
    },
    {
      "id": "content-density",
      "rule": "content-density",
      "query": "My slides have too much text and the content overflows. How many bullet points should I have per slide?",
      "expectedBehavior": [
        "Enforces maximum 4-6 bullet points or 2 paragraphs per content slide to prevent overflow",
        "Limits code slides to 8-10 lines maximum to ensure readability without scrolling",
        "Splits content that exceeds density limits into multiple slides rather than shrinking text",
        "Applies different density rules per slide type including title, content, feature grid, and quote"
      ]
    },
    {
      "id": "viewport-fitting",
      "rule": "viewport-fitting",
      "query": "How do I make sure every slide in my HTML presentation fits exactly on screen without scrolling?",
      "expectedBehavior": [
        "Sets each slide to exactly 100vh or 100dvh height with overflow hidden as non-negotiable rule",
        "Never uses min-height which allows content to extend beyond the viewport boundary",
        "Never enables overflow auto or scroll within individual presentation slides",
        "Splits overflowing content into additional slides rather than allowing scrolling within slides"
      ]
    }
  ]
}