V5.1: Premium SVG quality — filters, gradients, letter-spacing, visual hierarchy rules from real examples

interface/app_gradio.py

@@ -248,21 +248,32 @@ def executor_phase(data, project_path, style, progress_cb=None):
     icon_lib = icons.get("library", "chunk-filled")
     icon_inv = ", ".join(icons.get("inventory", []))
 
-    # Shared executor instructions
-    executor_rules = f"""SVG RULES (MANDATORY):
-- viewBox="0 0 1280 720" width="1280" height="720" xmlns="http://www.w3.org/2000/svg"
+    # Shared executor instructions — based on real PPT Master high-quality examples
+    executor_rules = f"""SVG TECHNICAL RULES (MANDATORY — violation = broken export):
+- <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1280 720" width="1280" height="720">
 - Colors ONLY from spec_lock: {color_str}
 - Title font: {font_title}. Body font: {font_body}
-- Body size: {typo.get('body',20)}px, Title size: {typo.get('title',40)}px
-- Icons: use <use data-icon="{icon_lib}/ICON_NAME" x="" y="" width="40" height="40" fill="COLOR"/>
+- Body size: {typo.get('body',20)}px, Title: {typo.get('title',40)}px, Subtitle: {typo.get('subtitle',26)}px, Annotation: {typo.get('annotation',14)}px
+- Icons: <use data-icon="{icon_lib}/ICON_NAME" x="" y="" width="40" height="40" fill="COLOR"/>
 - Available icons: {icon_inv}
 - FORBIDDEN: <style>, class, foreignObject, animate, script, mask, @font-face, rgba(), <g opacity="">
-- Use linearGradient/radialGradient in <defs> for backgrounds
-- Decorative elements: circles, lines, rects with fill-opacity for visual richness
-- All text as absolute <text> elements with font-family, font-size, fill attributes
-- Images: <image href="../images/FILENAME" x="" y="" width="" height="" preserveAspectRatio="xMidYMid slice"/>
-- Page number in bottom-right corner
-- Reply ONLY with SVG code: start with <svg, end with </svg>"""
+- Use fill-opacity/stop-opacity instead of rgba. Use inline attributes only.
+- Images: <image href="../images/FILENAME" preserveAspectRatio="xMidYMid slice"/>
+
+VISUAL QUALITY RULES (for premium output):
+- Use <defs> with linearGradient (3-4 stops with varying stop-opacity) for rich overlays
+- Use radialGradient for subtle background glows (stop-opacity="0.06" to "0")
+- Use <filter> for glow effects: feGaussianBlur + feFlood + feComposite + feMerge
+- Use letter-spacing="3" on category labels / section headers for editorial feel
+- Use vertical accent bars: <rect x="" y="" width="4" height="30" fill="PRIMARY"/>
+- Use thin separators: <rect width="200" height="1" fill="BORDER"/> between sections
+- Hierarchy: hero numbers at 80-120px bold, then 24px subtitle, then 16-18px body
+- Cards: rounded rects (rx="12") with subtle stroke, padding 20-30px inside
+- Top-level <g id="..."> grouping for each logical section (header, content, footer)
+- Page number: bottom-right, annotation size, muted color
+- Add decorative circles/dots at low opacity (0.06-0.15) for visual texture
+- Text must be readable: ensure contrast between text color and background
+- For breathing pages: big whitespace, one dominant element, dramatic"""
 
     total_notes = []
 
@@ -283,24 +294,27 @@ def executor_phase(data, project_path, style, progress_cb=None):
         content_str = "\n".join(f"  - {p}" for p in slide.get("content", []))
         rhythm = slide.get("rhythm", "dense")
 
-        prompt = f"""Generate SVG slide {num}/{num_total} for this presentation.
+        prompt = f"""Generate a premium-quality SVG slide. This must look like a professionally designed presentation.
 
-SLIDE SPEC:
+SLIDE {num}/{num_total}:
 - Title: {slide['title']}
 - Layout: {slide.get('layout','content')}
-- Rhythm: {rhythm} ({'full-bleed imagery, minimal text, breathing space' if rhythm == 'breathing' else 'information-rich, cards, structured content' if rhythm == 'dense' else 'structural, decorative, impactful'})
+- Rhythm: {rhythm} ({'dramatic full-bleed, big whitespace, one dominant element, cinematic' if rhythm == 'breathing' else 'information-rich, structured cards/lists, clear visual hierarchy' if rhythm == 'dense' else 'structural, impactful, decorative'})
 - Content:
 {content_str}
-- {img_ref or 'No image for this slide — use colors/shapes creatively'}
+- {img_ref or 'No image — use gradients, shapes, and strong typography as visual interest'}
 
 {executor_rules}
 
-Design direction for "{style}" style. Make it visually striking and professional.
-{"Use the image prominently (background or half-slide). Add dark overlay for text readability." if img_ref else ""}
-{"This is a COVER page: large title, dramatic, impactful." if slide.get('layout') == 'cover' else ""}
-{"This is a CLOSING page: centered, memorable, call-to-action feel." if slide.get('layout') == 'closing' else ""}
-{"This is a TIMELINE: show progression horizontally with nodes/circles." if slide.get('layout') == 'timeline' else ""}
-{"This is a COMPARISON: show two sides contrasted." if slide.get('layout') == 'comparison' else ""}"""
+DESIGN THIS SLIDE:
+{"COVER PAGE: dramatic, large title (60-80px), cinematic image as background with multi-stop gradient overlay, accent line, subtitle below. Make it impactful and memorable." if slide.get('layout') == 'cover' else ""}
+{"CLOSING PAGE: centered composition, large title, accent divider, final message. Elegant and memorable." if slide.get('layout') == 'closing' else ""}
+{"TIMELINE: horizontal line with circular nodes, dates/phases below, title at top. Clean and structured." if slide.get('layout') == 'timeline' else ""}
+{"COMPARISON: two-column layout with visual separator, contrasting elements side by side." if slide.get('layout') == 'comparison' else ""}
+{"CONTENT PAGE: asymmetric layout (image right/left, text opposite). Use accent bar before title. Bullet points with colored circles. Cards with rx=12 for grouped info." if slide.get('layout') == 'content' else ""}
+{"Use the image as background with dark gradient overlay (3-4 stops, progressive opacity)" if img_ref and rhythm == 'breathing' else f"Place image on one side (540px wide), text content on the other side" if img_ref else ""}
+
+Reply with ONLY the SVG. Start <svg, end </svg>. No explanation."""
 
         try:
             svg_content = llm_chat(prompt, max_tokens=8000, temperature=0.3)