Visual Note Card

Visual Note Card Generator

Create professional, information-dense visual note cards (视觉笔记/信息图) as self-contained HTML files with automatic PNG export via Playwright. The output is a structured, poster-style infographic with modular card layout, suitable for social media sharing or printing.

Design System

Before writing any code, read the reference template at assets/template.html for the canonical HTML/CSS structure. Then adapt the content to the user's topic.

Core Visual Identity

The design follows an editorial knowledge card aesthetic — high information density with clear visual hierarchy, inspired by premium magazine layouts and structured note-taking.

Color Palette (CSS Variables):

• --primary: Deep teal #1a7a6d — headers, badges, accent elements
• --primary-dark: #145f54 — bottom highlight bar
• --primary-deep: #0d3d36 — deep accent
• --accent: Orange #e8713a — emphasis, secondary badges, important labels
• --bg: Warm gray #f0ebe4 — page background
• --bg-light: #f5f1ec — light panel background
• --bg-card: #e8e3dc — framework card background
• --black: #1a1a1a — dark panel, primary text
• --white: #ffffff

Users may request alternate color schemes. If so, maintain the same structural contrast ratios: one warm neutral background, one strong primary color, one accent color, and black for dark panels.

Typography:

• English display: Playfair Display (serif, 700/900) — main title
• Chinese body: Noto Sans SC (400/500/700/900) — all Chinese text
• Monospace: JetBrains Mono (500/700) — labels, URLs, tags
• Import via Google Fonts in the <style> block

Layout — Fixed Poster Dimensions:

• Container width: 1200px
• Padding: 36px 40px 28px
• Background: var(--bg)

Mandatory Layout Sections (Top to Bottom)

Every visual note card MUST include these sections in order:

1. Top Bar

A single-line flex row with:

• Left: Topic label in uppercase monospace (e.g., AI PRODUCT ARCHITECTURE · SYSTEM DESIGN)
• Right: Source label (e.g., OPENAI ENGINEERING BLOG)

2. Main Title Area

Two-column flex layout:

• Left: Large bilingual title — English line in Playfair Display 38px, Chinese line in Noto Sans SC 40px colored with var(--primary)
• Right: A 2–3 line thesis statement (核心观点) summarizing the card's argument, with the key phrase in <strong>. Optionally include a source URL below.

3. Framework Row (Flexible Grid, Recommended 4 Columns)

A row of equal-width cards representing the core framework/model of the topic. The number of columns is flexible — choose based on the actual content:

• 2 columns — binary concepts, comparisons (e.g., Before vs After, Input vs Output)
• 3 columns — triads, triangular models (e.g., People-Process-Technology)
• 4 columns — recommended default, most common for frameworks (e.g., E-K-C-F, M-P-D-G)
• 5 columns — five-element models (e.g., HEART metrics, Five Forces)
• 6 columns — extended taxonomies (use sparingly, keep descriptions very short)

Analyze the topic and choose the column count that best fits the natural structure. Don't force 4 columns if the concept has 3 or 5 natural parts.

CSS implementation: Use grid-template-columns: repeat(N, 1fr) where N is the chosen column count.

Card structure (same regardless of column count):

• Each card has a colored square letter badge (first letter of the concept) + Chinese name
• Below the badge: 1–2 lines of description with one <strong> keyword
• For 5–6 columns, keep descriptions to 1 line to avoid overflow

Badge color rotation (cycles through these in order):

1. --primary (teal)
2. --primary (teal)
3. --accent (orange)
4. --primary-deep (deep teal)
5. --accent (orange) — if 5th column exists
6. --primary (teal) — if 6th column exists

The framework should be a memorable acronym (e.g., E-K-C-F, M-P-D-G). Invent one if the source doesn't provide it.

4. Two-Column Content Area

A grid-template-columns: 1fr 1fr layout:

Left: Dark Panel (background: var(--black), white text)

• Section title with emoji icon (⚡, 🔥, 🛠, etc.)
• 2 sub-blocks, each with an orange title (var(--accent)) and a bulleted list (custom ■ bullets in teal)
• List items use <strong> for key phrases (white color)
• A bottom "conclusion" block with a divider line and a memorable quote/insight (key phrase in #5ee6d0 mint color)

Right: Light Panel (background: var(--bg-light))

• Section title with star icon (★)
• 3–4 numbered insight items, each with:
  • A large serif number (Playfair Display 36px, teal)
  • Bold title line
  • 1–2 lines of description with <strong> keywords

5. Bottom Highlight Bar

Full-width bar with background: var(--primary-dark):

• Left: The framework formula (e.g., Architecture = M × P × D × G) in mint highlight color #5ee6d0
• Right: A closing thought in lighter text

6. Footer

Flex row:

• Left: Framework label in monospace
• Right: Brand / framework name with a small teal dot separator

Content Strategy

When the user provides a topic (or an article URL/text):

1. Extract or synthesize a 4-part framework — find the core structural model. If one doesn't exist, create a meaningful decomposition with a memorable acronym.
2. Write a provocative thesis — the right-side subtitle should be a strong, opinionated claim, not a bland description.
3. Dark panel = "Story + Transformation" — use this for narrative content: problems, transitions, role changes, paradigm shifts.
4. Light panel = "Pitfalls or Insights" — use this for actionable numbered takeaways.
5. Bottom formula — distill the entire card into one equation-style summary.
6. All text is Chinese except for: the main English title line, technical terms, framework acronyms, and footer labels.

Output

Default: HTML + PNG

By default, generate both an HTML file and a PNG image:

1. Generate the HTML — single self-contained .html file with all CSS inline. No external dependencies except Google Fonts and html2canvas CDN. Save to /mnt/user-data/outputs/.
2. Generate the PNG — run the bundled scripts/html2png.py script to render the HTML into a high-quality PNG image.

bashCopy code
python <skill-path>/scripts/html2png.py /mnt/user-data/outputs/card.html /mnt/user-data/outputs/card.png --scale=1.5

Present both files to the user (PNG first, then HTML). The PNG is the primary deliverable for sharing; the HTML enables further browser-based export or editing.

If the user explicitly asks for "只要 HTML" or "HTML only", skip the PNG step.

PNG Generation Script: scripts/html2png.py

A Playwright-based headless renderer. It opens the HTML in Chromium, waits for Google Fonts to load, hides the FAB button, then screenshots the .poster element.

Usage:

bashCopy code
python html2png.py <input.html> [output.png] [--scale=N]

Scale options:

• --scale=1 — standard (1200px wide), smallest file
• --scale=1.5 — default, recommended for social media (1800px wide)
• --scale=2 — print quality (2400px wide)

Dependencies: playwright (pip install playwright && playwright install chromium). Pre-installed on Claude's compute environment.

Download Button (Mandatory in HTML)

Every generated HTML card MUST include a floating action button (FAB) in the bottom-right corner with a dropdown menu for export options:

• 标准 PNG — 1× scale, quick sharing
• 高清 PNG — 1.5× scale, social media recommended
• 超清 PNG — 2× scale, for printing
• JPEG — 1.5× scale, smaller file size

Implementation:

1. Add <script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js"></script> before </body>
2. The FAB (div.fab-wrap) is placed OUTSIDE .poster so it won't appear in the exported image
3. Clicking the FAB toggles a dropdown menu upward; clicking outside closes it
4. During capture, the FAB is hidden and a toast spinner ("正在导出…") is shown
5. The FAB icon toggles between a download arrow and a close ×
6. The exported filename is derived from document.title + scale suffix

See assets/template.html for the complete FAB HTML, CSS, and JS.

Copyright (Mandatory)

Every card MUST include a copyright bar inside the .poster div (below the footer, separated by a thin border-top), so it appears in both the HTML page and the exported PNG:

htmlCopy code
<div class="copyright-bar">
  <svg><!-- GitHub icon --></svg>
  <span>Generated by <a href="https://github.com/beilunyang/visual-note-card-skills">https://github.com/beilunyang/visual-note-card-skills</a></span>
</div>

Example Prompts → Expected Behavior