A simple split-pane Markdown editor and live preview.

Paste Markdown on the left. See a styled result on the right after a short delay (300ms) so typing stays smooth.

• Two full-height panes — source editor + reading preview (both follow theme)
• Dark mode — toggle in the nav; defaults to system preference and remembers your choice
• Debounced live preview — updates 300ms after you stop typing
• Vercel-inspired design — tokens and typography from DESIGN.md (Geist, ink/canvas palette)
• Safe rendering — Markdown is sanitized with DOMPurify before display
• Sample / Clear / Copy — quick actions in the top bar
• Download as HTML or PDF — export the preview as a self-contained HTML page, or open a print dialog to save as PDF
• RTL-aware — Arabic / Persian / Hebrew content switches both panes to RTL and uses Vazirmatn; code blocks stay LTR

No build step. Open the page in a browser:

# Option A — open directly
open index.html

# Option B — local server (recommended; avoids some clipboard / module quirks)
python3 -m http.server 5173
# then visit http://localhost:5173

index.html   # shell + layout
styles.css   # design tokens + pane + prose styles
app.js       # debounce, render, actions
DESIGN.md    # visual design system
images/      # favicon + brand icons

• Tab in the editor inserts two spaces
• Focus rings are visible for keyboard navigation