Add frontend slides skill across platforms

2026-03-30 13:43:26 +08:00 · 2026-02-27 05:39:31 -08:00
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+---
+name: frontend-slides
+description: Create stunning, animation-rich HTML presentations from scratch or by converting PowerPoint files. Use when the user wants to build a presentation, convert a PPT/PPTX to web, or create slides for a talk/pitch. Helps non-designers discover their aesthetic through visual exploration rather than abstract choices.
+origin: ECC
+---
+
+# Frontend Slides
+
+Create zero-dependency, animation-rich HTML presentations that run entirely in the browser.
+
+Inspired by the visual exploration approach showcased in work by [zarazhangrui](https://github.com/zarazhangrui).
+
+## When to Activate
+
+- Creating a talk deck, pitch deck, workshop deck, or internal presentation
+- Converting `.ppt` or `.pptx` slides into an HTML presentation
+- Improving an existing HTML presentation's layout, motion, or typography
+- Exploring presentation styles with a user who does not know their design preference yet
+
+## Non-Negotiables
+
+1. **Zero dependencies**: default to one self-contained HTML file with inline CSS and JS.
+2. **Viewport fit is mandatory**: every slide must fit inside one viewport with no internal scrolling.
+3. **Show, don't tell**: use visual previews instead of abstract style questionnaires.
+4. **Distinctive design**: avoid generic purple-gradient, Inter-on-white, template-looking decks.
+5. **Production quality**: keep code commented, accessible, responsive, and performant.
+
+Before generating, read `STYLE_PRESETS.md` for the viewport-safe CSS base, density limits, preset catalog, and CSS gotchas.
+
+## Workflow
+
+### 1. Detect Mode
+
+Choose one path:
+- **New presentation**: user has a topic, notes, or full draft
+- **PPT conversion**: user has `.ppt` or `.pptx`
+- **Enhancement**: user already has HTML slides and wants improvements
+
+### 2. Discover Content
+
+Ask only the minimum needed:
+- purpose: pitch, teaching, conference talk, internal update
+- length: short (5-10), medium (10-20), long (20+)
+- content state: finished copy, rough notes, topic only
+
+If the user has content, ask them to paste it before styling.
+
+### 3. Discover Style
+
+Default to visual exploration.
+
+If the user already knows the desired preset, skip previews and use it directly.
+
+Otherwise:
+1. Ask what feeling the deck should create: impressed, energized, focused, inspired.
+2. Generate **3 single-slide preview files** in `.ecc-design/slide-previews/`.
+3. Each preview must be self-contained, show typography/color/motion clearly, and stay under roughly 100 lines of slide content.
+4. Ask the user which preview to keep or what elements to mix.
+
+Use the preset guide in `STYLE_PRESETS.md` when mapping mood to style.
+
+### 4. Build the Presentation
+
+Output either:
+- `presentation.html`
+- `[presentation-name].html`
+
+Use an `assets/` folder only when the deck contains extracted or user-supplied images.
+
+Required structure:
+- semantic slide sections
+- a viewport-safe CSS base from `STYLE_PRESETS.md`
+- CSS custom properties for theme values
+- a presentation controller class for keyboard, wheel, and touch navigation
+- Intersection Observer for reveal animations
+- reduced-motion support
+
+### 5. Enforce Viewport Fit
+
+Treat this as a hard gate.
+
+Rules:
+- every `.slide` must use `height: 100vh; height: 100dvh; overflow: hidden;`
+- all type and spacing must scale with `clamp()`
+- when content does not fit, split into multiple slides
+- never solve overflow by shrinking text below readable sizes
+- never allow scrollbars inside a slide
+
+Use the density limits and mandatory CSS block in `STYLE_PRESETS.md`.
+
+### 6. Validate
+
+Check the finished deck at these sizes:
+- 1920x1080
+- 1280x720
+- 768x1024
+- 375x667
+- 667x375
+
+If browser automation is available, use it to verify no slide overflows and that keyboard navigation works.
+
+### 7. Deliver
+
+At handoff:
+- delete temporary preview files unless the user wants to keep them
+- open the deck with the platform-appropriate opener when useful
+- summarize file path, preset used, slide count, and easy theme customization points
+
+Use the correct opener for the current OS:
+- macOS: `open file.html`
+- Linux: `xdg-open file.html`
+- Windows: `start "" file.html`
+
+## PPT / PPTX Conversion
+
+For PowerPoint conversion:
+1. Prefer `python3` with `python-pptx` to extract text, images, and notes.
+2. If `python-pptx` is unavailable, ask whether to install it or fall back to a manual/export-based workflow.
+3. Preserve slide order, speaker notes, and extracted assets.
+4. After extraction, run the same style-selection workflow as a new presentation.
+
+Keep conversion cross-platform. Do not rely on macOS-only tools when Python can do the job.
+
+## Implementation Requirements
+
+### HTML / CSS
+
+- Use inline CSS and JS unless the user explicitly wants a multi-file project.
+- Fonts may come from Google Fonts or Fontshare.
+- Prefer atmospheric backgrounds, strong type hierarchy, and a clear visual direction.
+- Use abstract shapes, gradients, grids, noise, and geometry rather than illustrations.
+
+### JavaScript
+
+Include:
+- keyboard navigation
+- touch / swipe navigation
+- mouse wheel navigation
+- progress indicator or slide index
+- reveal-on-enter animation triggers
+
+### Accessibility
+
+- use semantic structure (`main`, `section`, `nav`)
+- keep contrast readable
+- support keyboard-only navigation
+- respect `prefers-reduced-motion`
+
+## Content Density Limits
+
+Use these maxima unless the user explicitly asks for denser slides and readability still holds:
+
+| Slide type | Limit |
+|------------|-------|
+| Title | 1 heading + 1 subtitle + optional tagline |
+| Content | 1 heading + 4-6 bullets or 2 short paragraphs |
+| Feature grid | 6 cards max |
+| Code | 8-10 lines max |
+| Quote | 1 quote + attribution |
+| Image | 1 image constrained by viewport |
+
+## Anti-Patterns
+
+- generic startup gradients with no visual identity
+- system-font decks unless intentionally editorial
+- long bullet walls
+- code blocks that need scrolling
+- fixed-height content boxes that break on short screens
+- invalid negated CSS functions like `-clamp(...)`
+
+## Related ECC Skills
+
+- `frontend-patterns` for component and interaction patterns around the deck
+- `liquid-glass-design` when a presentation intentionally borrows Apple glass aesthetics
+- `e2e-testing` if you need automated browser verification for the final deck
+
+## Deliverable Checklist
+
+- presentation runs from a local file in a browser
+- every slide fits the viewport without scrolling
+- style is distinctive and intentional
+- animation is meaningful, not noisy
+- reduced motion is respected
+- file paths and customization points are explained at handoff
--- a/.cursor/skills/frontend-slides/STYLE_PRESETS.md
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+# Style Presets Reference
+
+Curated visual styles for `frontend-slides`.
+
+Use this file for:
+- the mandatory viewport-fitting CSS base
+- preset selection and mood mapping
+- CSS gotchas and validation rules
+
+Abstract shapes only. Avoid illustrations unless the user explicitly asks for them.
+
+## Viewport Fit Is Non-Negotiable
+
+Every slide must fully fit in one viewport.
+
+### Golden Rule
+
+```text
+Each slide = exactly one viewport height.
+Too much content = split into more slides.
+Never scroll inside a slide.
+```
+
+### Density Limits
+
+| Slide Type | Maximum Content |
+|------------|-----------------|
+| Title slide | 1 heading + 1 subtitle + optional tagline |
+| Content slide | 1 heading + 4-6 bullets or 2 paragraphs |
+| Feature grid | 6 cards maximum |
+| Code slide | 8-10 lines maximum |
+| Quote slide | 1 quote + attribution |
+| Image slide | 1 image, ideally under 60vh |
+
+## Mandatory Base CSS
+
+Copy this block into every generated presentation and then theme on top of it.
+
+```css
+/* ===========================================
+   VIEWPORT FITTING: MANDATORY BASE STYLES
+   =========================================== */
+
+html, body {
+    height: 100%;
+    overflow-x: hidden;
+}
+
+html {
+    scroll-snap-type: y mandatory;
+    scroll-behavior: smooth;
+}
+
+.slide {
+    width: 100vw;
+    height: 100vh;
+    height: 100dvh;
+    overflow: hidden;
+    scroll-snap-align: start;
+    display: flex;
+    flex-direction: column;
+    position: relative;
+}
+
+.slide-content {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    max-height: 100%;
+    overflow: hidden;
+    padding: var(--slide-padding);
+}
+
+: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);
+}
+
+.card, .container, .content-box {
+    max-width: min(90vw, 1000px);
+    max-height: min(80vh, 700px);
+}
+
+.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;
+}
+
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
+    gap: clamp(0.5rem, 1.5vw, 1rem);
+}
+
+img, .image-container {
+    max-width: 100%;
+    max-height: min(50vh, 400px);
+    object-fit: contain;
+}
+
+@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);
+    }
+}
+
+@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;
+    }
+}
+
+@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);
+    }
+}
+
+@media (max-width: 600px) {
+    :root {
+        --title-size: clamp(1.25rem, 7vw, 2.5rem);
+    }
+
+    .grid {
+        grid-template-columns: 1fr;
+    }
+}
+
+@media (prefers-reduced-motion: reduce) {
+    *, *::before, *::after {
+        animation-duration: 0.01ms !important;
+        transition-duration: 0.2s !important;
+    }
+
+    html {
+        scroll-behavior: auto;
+    }
+}
+```
+
+## Viewport Checklist
+
+- every `.slide` has `height: 100vh`, `height: 100dvh`, and `overflow: hidden`
+- all typography uses `clamp()`
+- all spacing uses `clamp()` or viewport units
+- images have `max-height` constraints
+- grids adapt with `auto-fit` + `minmax()`
+- short-height breakpoints exist at `700px`, `600px`, and `500px`
+- if anything feels cramped, split the slide
+
+## Mood to Preset Mapping
+
+| Mood | Good Presets |
+|------|--------------|
+| 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 |
+
+## Preset Catalog
+
+### 1. Bold Signal
+
+- Vibe: confident, high-impact, keynote-ready
+- Best for: pitch decks, launches, statements
+- Fonts: Archivo Black + Space Grotesk
+- Palette: charcoal base, hot orange focal card, crisp white text
+- Signature: oversized section numbers, high-contrast card on dark field
+
+### 2. Electric Studio
+
+- Vibe: clean, bold, agency-polished
+- Best for: client presentations, strategic reviews
+- Fonts: Manrope only
+- Palette: black, white, saturated cobalt accent
+- Signature: two-panel split and sharp editorial alignment
+
+### 3. Creative Voltage
+
+- Vibe: energetic, retro-modern, playful confidence
+- Best for: creative studios, brand work, product storytelling
+- Fonts: Syne + Space Mono
+- Palette: electric blue, neon yellow, deep navy
+- Signature: halftone textures, badges, punchy contrast
+
+### 4. Dark Botanical
+
+- Vibe: elegant, premium, atmospheric
+- Best for: luxury brands, thoughtful narratives, premium product decks
+- Fonts: Cormorant + IBM Plex Sans
+- Palette: near-black, warm ivory, blush, gold, terracotta
+- Signature: blurred abstract circles, fine rules, restrained motion
+
+### 5. Notebook Tabs
+
+- Vibe: editorial, organized, tactile
+- Best for: reports, reviews, structured storytelling
+- Fonts: Bodoni Moda + DM Sans
+- Palette: cream paper on charcoal with pastel tabs
+- Signature: paper sheet, colored side tabs, binder details
+
+### 6. Pastel Geometry
+
+- Vibe: approachable, modern, friendly
+- Best for: product overviews, onboarding, lighter brand decks
+- Fonts: Plus Jakarta Sans only
+- Palette: pale blue field, cream card, soft pink/mint/lavender accents
+- Signature: vertical pills, rounded cards, soft shadows
+
+### 7. Split Pastel
+
+- Vibe: playful, modern, creative
+- Best for: agency intros, workshops, portfolios
+- Fonts: Outfit only
+- Palette: peach + lavender split with mint badges
+- Signature: split backdrop, rounded tags, light grid overlays
+
+### 8. Vintage Editorial
+
+- Vibe: witty, personality-driven, magazine-inspired
+- Best for: personal brands, opinionated talks, storytelling
+- Fonts: Fraunces + Work Sans
+- Palette: cream, charcoal, dusty warm accents
+- Signature: geometric accents, bordered callouts, punchy serif headlines
+
+### 9. Neon Cyber
+
+- Vibe: futuristic, techy, kinetic
+- Best for: AI, infra, dev tools, future-of-X talks
+- Fonts: Clash Display + Satoshi
+- Palette: midnight navy, cyan, magenta
+- Signature: glow, particles, grids, data-radar energy
+
+### 10. Terminal Green
+
+- Vibe: developer-focused, hacker-clean
+- Best for: APIs, CLI tools, engineering demos
+- Fonts: JetBrains Mono only
+- Palette: GitHub dark + terminal green
+- Signature: scan lines, command-line framing, precise monospace rhythm
+
+### 11. Swiss Modern
+
+- Vibe: minimal, precise, data-forward
+- Best for: corporate, product strategy, analytics
+- Fonts: Archivo + Nunito
+- Palette: white, black, signal red
+- Signature: visible grids, asymmetry, geometric discipline
+
+### 12. Paper & Ink
+
+- Vibe: literary, thoughtful, story-driven
+- Best for: essays, keynote narratives, manifesto decks
+- Fonts: Cormorant Garamond + Source Serif 4
+- Palette: warm cream, charcoal, crimson accent
+- Signature: pull quotes, drop caps, elegant rules
+
+## Direct Selection Prompts
+
+If the user already knows the style they want, let them pick directly from the preset names above instead of forcing preview generation.
+
+## Animation Feel Mapping
+
+| Feeling | Motion Direction |
+|---------|------------------|
+| Dramatic / Cinematic | slow fades, parallax, large scale-ins |
+| Techy / Futuristic | glow, particles, grid motion, scramble text |
+| Playful / Friendly | springy easing, rounded shapes, floating motion |
+| Professional / Corporate | subtle 200-300ms transitions, clean slides |
+| Calm / Minimal | very restrained movement, whitespace-first |
+| Editorial / Magazine | strong hierarchy, staggered text and image interplay |
+
+## CSS Gotcha: Negating Functions
+
+Never write these:
+
+```css
+right: -clamp(28px, 3.5vw, 44px);
+margin-left: -min(10vw, 100px);
+```
+
+Browsers ignore them silently.
+
+Always write this instead:
+
+```css
+right: calc(-1 * clamp(28px, 3.5vw, 44px));
+margin-left: calc(-1 * min(10vw, 100px));
+```
+
+## Validation Sizes
+
+Test at minimum:
+- Desktop: `1920x1080`, `1440x900`, `1280x720`
+- Tablet: `1024x768`, `768x1024`
+- Mobile: `375x667`, `414x896`
+- Landscape phone: `667x375`, `896x414`
+
+## Anti-Patterns
+
+Do not use:
+- purple-on-white startup templates
+- Inter / Roboto / Arial as the visual voice unless the user explicitly wants utilitarian neutrality
+- bullet walls, tiny type, or code blocks that require scrolling
+- decorative illustrations when abstract geometry would do the job better