Frontend Design

Then implement working code (HTML/CSS/JS, React, Vue, etc.) that is:

• Production-grade and functional
• Visually striking and memorable
• Cohesive with a clear aesthetic point-of-view
• Meticulously refined in every detail

Frontend Aesthetics Guidelines

Focus on:

• Typography: Choose fonts that are beautiful, unique, and interesting. Avoid generic fonts like Arial and Inter; opt instead for distinctive choices that elevate the frontend's aesthetics. Pair a distinctive display font with a refined body font.
• Color & Theme: Commit to a cohesive aesthetic. Use CSS variables for consistency. Dominant colors with sharp accents outperform timid, evenly-distributed palettes.
• Motion: Use animations for effects and micro-interactions. Prioritize CSS-only solutions for HTML. Focus on high-impact moments: one well-orchestrated page load with staggered reveals creates more delight than scattered micro-interactions.
• Spatial Composition: Unexpected layouts. Asymmetry. Overlap. Diagonal flow. Grid-breaking elements. Generous negative space OR controlled density.
• Backgrounds & Visual Details: Create atmosphere and depth. Add contextual effects and textures that match the overall aesthetic. Apply creative forms like gradient meshes, noise textures, geometric patterns, layered transparencies, dramatic shadows, and decorative borders.

NEVER use generic AI-generated aesthetics like overused font families (Inter, Roboto, Arial, system fonts), cliched color schemes (particularly purple gradients on white backgrounds), or cookie-cutter design that lacks context-specific character.

All output must be fully responsive and render correctly across desktop, tablet, and mobile screen sizes. Use fluid layouts, relative units, and media queries where needed.

Email & Outlook Rendering

When the output is intended for email (including Outlook), override the general aesthetic guidelines above with the following constraints. Outlook uses the Word 2007 HTML rendering engine, which only supports a subset of HTML 4.01 and CSS 1.0.

Layout

• Use table-based layouts — <table>, <tr>, <td> are the only reliable way to create multi-column or structured layouts. Do NOT rely on <div> for layout.
• Set width as an HTML attribute on <table> and <td>, not only in CSS.
• Use cellpadding and cellspacing HTML attributes on tables for spacing.
• Set border="0" on layout tables to prevent visible borders.

CSS

• Use inline styles only — place all CSS in style attributes on each element. Do NOT use <style> blocks or external stylesheets; Outlook may strip them.
• No CSS variables (var(--x)) — Outlook ignores them entirely.
• No shorthand gotchas — prefer explicit properties (e.g., border-top-width, border-top-style, border-top-color) over shorthand when precision matters. Basic shorthand like font, margin, border, and padding is supported.
• <span> only supports CORE CSS: color, font, font-family, font-style, font-variant, font-size, font-weight, text-decoration, background-color, text-align, vertical-align, letter-spacing, line-height, white-space, border properties.
• <div> and <p> support COREEXTENDED: everything in CORE plus text-indent, margin, margin-left, margin-right, margin-top, margin-bottom.
• Most other elements (<table>, <td>, <th>, <img>, <a>, etc.) support FULL CSS: everything in COREEXTENDED plus width, height, padding properties, and individual border-* properties.

Unsupported CSS (do NOT use in email)

background-image, background-attachment, background-position, background-repeat, float, position, display (in CSS2.1 context), max-width, min-width, max-height, min-height, text-transform, text-shadow, word-spacing, overflow, clear, border-spacing, opacity, CSS animations/transitions, @media queries, @import, @font-face, CSS Grid, Flexbox.

Unsupported HTML elements (do NOT use in email)

<form>, <button>, <input>, <select>, <option>, <iframe>, <object>, <script>, <noscript>, <video>, <audio>, <canvas>, <svg>.

Typography for email

• Use web-safe font stacks only: Arial, Helvetica, Georgia, Times New Roman, Courier New, Verdana, Tahoma, Trebuchet MS. Always include a generic fallback (sans-serif, serif, monospace).
• Do NOT use Google Fonts, @font-face, or any externally loaded fonts — Outlook will ignore them.

Colors & backgrounds

• Use bgcolor HTML attribute on <table>, <tr>, and <td> for background colors in addition to inline background-color CSS for maximum compatibility.
• Use hex color codes (e.g., #FF0000), not rgb(), rgba(), hsl(), or named colors.
• No gradients — use solid colors only.

Images

• Set width and height as HTML attributes on <img> tags, not only in CSS.
• Always include an alt attribute.
• Use display:block on images to prevent unwanted spacing.
• Animated GIFs render as static images in Outlook.

Responsive design in email

• Since @media queries are NOT supported by Outlook, design for a fixed width of 600px as the standard email width.
• Use width="100%" on the outer wrapper table and a fixed-width inner table (e.g., width="600") for consistent rendering.
• Do NOT use fluid/relative units (vw, vh, % on nested elements) for critical layout — Outlook ignores them in many contexts.

General email rules

• No JavaScript of any kind.
• No event attributes (onclick, onmouseover, etc.).
• No <iframe> or <frameset> — blocked by Outlook security.
• Keep HTML simple and flat — deeply nested tables can cause rendering quirks.