Web Deck — CoinFund Web Presentation Builder

Build minimalist, CoinFund-branded slide decks as self-contained HTML files. Each deck is a single .html file — no build step, no dependencies, trivially versionable in Git.

When to Use

Any time the user wants a web-based slide deck (HTML/CSS/JS). For .pptx output, use the jake-deck skill instead. This skill is for browser-native presentations that can also export to PDF.

The user specifies:

1. Mode: static (print-optimized, no JS) or dynamic (keyboard navigation, slide transitions). Default: dynamic.
2. Content: Slide titles and content, as an outline or bullet points.

Design System

Color Palette (CSS Custom Properties)

:root {
  --bg:      #F7F3EE;  /* Warm cream — all slide backgrounds        */
  --text:    #1A1A1A;  /* Near-black — headings, primary body text   */
  --gray:    #7A7A7A;  /* Secondary text, labels                     */
  --ltgray:  #C8C2BA;  /* Divider rules, subtle borders              */
  --white:   #FFFFFF;  /* Title slide background, table headers      */
  --red:     #C0392B;  /* Warnings, risks, negative indicators       */
  --green:   #27AE60;  /* Positive indicators, "ready" status        */
  --blue:    #2C3E50;  /* Section headers, callout boxes             */
}

Typography

All text uses Nunito (loaded from Google Fonts, with system-font fallback for offline use).

Element	Size	Weight	Color
Slide title	28px	700	--blue
Section header	16px	700	--text
Body text	13px	400	--text
Labels/secondary	11px	400	--gray
Footnotes	10-11px	400	--red or --gray

Layout

Slides are 16:9 aspect ratio (960px x 540px base, scaled to fill viewport).

┌──────────────────────────────────────────────┐
│  padding-left: 76px (~0.8" equivalent)       │
│  ┌─ Title zone: top 50px ──────────────────┐ │
│  │                                          │ │
│  ├─ Content zone: top 110px ───────────────┤ │
│  │  width: 808px (~8.4" equivalent)        │ │
│  │                                          │ │
│  ├─ Footnote zone: bottom 30px ────────────┤ │
│  └──────────────────────────────────────────┘ │
└──────────────────────────────────────────────┘

Required Slides

Title Slide (always first)

• Background: --white (#FFFFFF), not cream
• CoinFund logo: text wordmark "CoinFund" in 52px Arial bold, color --text, centered
• Thin divider line below wordmark: 240px wide, --text, centered
• Deck title: 28px Nunito bold, color --blue, centered below divider
• Subtitle/date: 14px Nunito, color --gray, centered

<section class="slide slide--title">
  <div class="slide__wordmark">CoinFund</div>
  <hr class="slide__divider slide__divider--title">
  <h1 class="slide__deck-title">Deck Title Here</h1>
  <p class="slide__subtitle">March 2026</p>
</section>

End Slide (always last)

• Background: --bg (cream)
• "CoinFund" in 36px Nunito bold, color --blue, centered
• Gray divider rule centered
• "coinfund.io" in 13px Nunito, color --gray, centered

<section class="slide slide--end">
  <div class="slide__end-wordmark">CoinFund</div>
  <hr class="slide__divider slide__divider--end">
  <p class="slide__end-url">coinfund.io</p>
</section>

Content Slide Patterns

Every content slide follows this HTML structure:

<section class="slide">
  <h2 class="slide__title">Slide Title</h2>
  <hr class="slide__accent">
  <div class="slide__body">
    <!-- Content using one of the patterns below -->
  </div>
  <!-- Optional footnote -->
  <footer class="slide__footnote">Footnote text</footer>
</section>

Pattern 1: Header + Body Blocks (default, most common)

For slides with 3-5 topics, each with bold header and description.

<div class="block">
  <div class="block__header">Bold header text</div>
  <div class="block__body">Gray body description text.</div>
</div>
<!-- Repeat for each block. Max 4-5 per slide. -->

Pattern 2: Label-Value Grid

Two-column layout: gray labels left, text values right.

<div class="kv-grid">
  <div class="kv-grid__row">
    <span class="kv-grid__label">Label</span>
    <span class="kv-grid__value">Value text here</span>
  </div>
  <!-- Max 6 rows per slide -->
</div>

Pattern 3: Table

Blue header row with white text, alternating cream/white body rows.

<table class="deck-table">
  <thead>
    <tr><th>Column A</th><th>Column B</th><th>Column C</th></tr>
  </thead>
  <tbody>
    <tr><td>Data</td><td>Data</td><td>Data</td></tr>
    <tr><td>Data</td><td>Data</td><td>Data</td></tr>
  </tbody>
</table>

Pattern 4: Numbered List

Blue number + bold label + body inline.

<ol class="numbered-list">
  <li>
    <span class="numbered-list__label">Item name</span>
    <span class="numbered-list__desc">Description text explaining the item.</span>
  </li>
</ol>

Pattern 5: Callout Box

Light blue-gray fill with left border accent.

<div class="callout">
  <p>Key insight or important note goes here.</p>
</div>

Entrance Animations

In dynamic mode, add class="reveal" to any element that should animate in when its slide becomes active. Elements fade up with staggered timing based on their position among siblings.

<section class="slide">
  <h2 class="slide__title reveal">Title animates first</h2>
  <hr class="slide__accent reveal">
  <div class="slide__body">
    <div class="block reveal">This block animates third</div>
    <div class="block reveal">This one fourth (0.08s delay)</div>
  </div>
</section>

In static mode, reveal has no effect — elements render normally.

Static vs. Dynamic Mode

Static Mode (data-mode="static")

• No JavaScript whatsoever
• All slides visible in sequence, separated by CSS page breaks
• Optimized for Cmd+P / Ctrl+P browser print or Puppeteer PDF export
• Each <section class="slide"> gets page-break-after: always

Dynamic Mode (data-mode="dynamic")

• Keyboard navigation: Arrow keys, Space, Page Up/Down
• Touch/swipe navigation on mobile and tablet
• Current slide indicator (e.g., "3 / 12") in bottom-right
• Blue progress bar at top of viewport
• Subtle fade transitions between slides (CSS opacity + transition)
• Staggered entrance animations on .reveal elements
• URL hash updates per slide (#slide-3) for deep linking
• Press F for fullscreen, Esc to exit
• Press P to toggle overview mode (shows all slides, click to jump)
• prefers-reduced-motion automatically disables animations

HTML Template

The file template.html (in the same directory as this SKILL.md) is the complete, working boilerplate for every deck. It includes all CSS (design tokens, patterns 1-5, animations, static/dynamic modes, print styles) and all JS (keyboard/touch nav, overview mode, fullscreen, progress bar, hash deep linking).

Creating a new deck

Copy the template to start every new deck:

cp <skill-dir>/template.html deck.html

Then:

1. Set data-mode on <html> to "dynamic" or "static"
2. Replace DECK_TITLE_HERE in <title> and .slide__deck-title
3. Replace MONTH YEAR in .slide__subtitle
4. Add content slides between the title and end slides, using the content patterns documented above

Do not regenerate the boilerplate from memory. Always copy the template file.

Live Development Server (MANDATORY)

ALWAYS serve decks through the dev server. Never open deck files directly via file:// — the server provides live reload, the hamburger overlay menu, and PDF export. Without it, the user gets a static file with no interactivity tools.

The dev server is at serve-deck.mjs (same directory as this SKILL.md). Zero npm dependencies (Puppeteer auto-installed on first PDF export).

Starting the server

node /path/to/skills/web-deck/serve-deck.mjs 3333 /path/to/deck/directory

Then open the browser:

open http://localhost:3333/deck.html

Start the server BEFORE opening the browser. Use run_in_background: true so it persists across edits.

What the server provides

1. Live reload — SSE-based, auto-reloads the browser on every file save. The user sees changes instantly as you edit slides.
2. Hamburger overlay menu — always-visible hamburger icon (☰) in the top-right corner with:
   • Download as PDF — Puppeteer renders the deck server-side at 960×540px per slide, producing a faithful PDF with all fonts and styles intact. Auto-installs Puppeteer on first use.
   • ⌘P hint — reminder that browser print also works
3. Static file serving — serves the deck and any local assets (images, fonts)

The overlay menu and reload client are injected at serve time — they do not exist in the deck.html file itself. The deck stays clean and self-contained. This is why the server is mandatory: without it, no hamburger menu, no PDF export, no live reload.

Workflow

1. User provides outline (slide titles + content bullets) and mode preference (static/dynamic)
2. Copy the template: cp <skill-dir>/template.html deck.html
3. Set the mode, title, and subtitle in the copied file
4. Choose the right content pattern for each slide and add content slides
5. Start the server (background, one time): node <skill-dir>/serve-deck.mjs 3333 . with run_in_background: true
6. Open in browser (one time): open http://localhost:3333/deck.html
7. Iterate — use the Edit tool to modify slides. The browser auto-reloads on every save.
8. User clicks the hamburger menu → Download as PDF when ready.

Important: keep the server running

• Start the server with run_in_background: true so it persists across edits
• The second argument is the directory to serve (defaults to .)
• The server stays alive for the session — no auto-shutdown
• When the session ends or user is done, kill the server: pkill -f serve-deck or let it die naturally

Style Principles

The CoinFund deck style is defined by restraint:

1. No gradients, drop shadows, or decorative elements. The CSS box-shadow on slides is only for the browser viewport framing, not part of the slide content itself.
2. Color is semantic. Blue for structure, red for risk/warnings, green for readiness/positive. Never decorative.
3. Whitespace does the heavy lifting. Generous padding, clear spacing between blocks. If it feels crowded, split into two slides.
4. Max 4-5 content blocks per slide. Prevents overflow and keeps slides scannable.
5. Footnotes sit below main content with a clear gap. Use slide__footnote positioned at the bottom.
6. One accent line per slide. The short slide__accent <hr> separates title from content. That's the only decoration.
7. Terse over verbose. Bullets should be 1-2 sentences max. The deck is a conversation starter, not a whitepaper.
8. Uniform style changes. When the user makes a visual or stylistic change to one slide, apply that change consistently across all slides in the deck.

Incremental Editing

The live server makes editing feel like a REPL — edit the file, see the result immediately.

Because the deck is a single HTML file:

• Git-friendly: each slide is a <section> block, so diffs are clean and meaningful
• Add slides: insert new <section class="slide"> blocks between existing ones
• Reorder: cut/paste <section> blocks
• Edit content: modify text within existing sections
• Style tweaks: adjust CSS custom properties in :root for global changes

When the user asks to edit specific slides, use the Edit tool to modify just the relevant <section> blocks. Do not regenerate the entire file for small changes. The live server will auto-reload on every save.

Overflow Prevention

• 5 blocks max per slide (Pattern 1)
• 6 rows max per label-value grid (Pattern 2)
• 7 table rows max (including header)
• Footnotes anchored to bottom: 20px via absolute positioning
• If content won't fit, split into two slides — never shrink fonts below 10px