Design a light-mode mobile app interface screen: sunlit urban cycling commerce wrapped in pastel-tinted cards and punchy vermilion accents.
LAYOUT
The vertical hierarchy opens with a 48px utility header, cascading into a single expansive hero promo module that fills roughly 40% of the initial viewport. Directly underneath sits a three-column horizontal cluster of portrait demographic tiles, followed by a titled section introducing an enclosed multi-item product card. Spacing follows an 8px base rhythm with 16px lateral padding, ensuring comfortable touch target separations.
PALETTE (use these exact hex values)
- #F8F9FA — Canvas Background: Global application background beneath all cards and navigation bars
- #FFFFFF — Pure White Surface: Floating action disks, category strip container, and active dot indicators
- #F05336 — Vermilion Red: Primary action button, logo suffix accent, notification badge, and pagination dots
- #16181D — Deep Charcoal: Main headlines, hero titles, product labels, and primary icon strokes
- #71767E — Muted Slate: Body copy, subheads, category descriptions, and inactive icon tints
- #DCE5EE — Men Tint Slate: Background fill for men's cycling gear and performance card
- #E8E2F2 — Women Tint Lilac: Background fill for women's category card
- #DFE9D3 — Kids Tint Sage: Background fill for youth and kids category card
- #EEF0F2 — Divider Gray: Subtle vertical borders dividing horizontal bike category cards
TYPOGRAPHY
Typeface Plus Jakarta Sans (or Inter, SF Pro Display, Poppins), weights 400/500/600/700/800. Sizes 10px caption, 12px body-sm, 14px body, 16px subheading, 20px heading, 32px display. Tracking -0.02em at display, 0.05em at kicker. Plus Jakarta Sans delivers a clean, athletic, and contemporary European mobility tone with its rounded geometric curves and wide counters. The high weight contrast between ultra-bold titles and relaxed slate captions evokes premium sporting retail without feeling overly technical. Inter or SF Pro Display serve as direct, frictionless system substitutes.
GEOMETRY & SPACING
Corner radii — cards 20px, links 999px, inputs 12px, buttons 10px. Spacing on a 4px unit, 12px gaps, 24px between sections, 390px container, comfortable density.
DEPTH
Depth is communicated through crisp layered surfaces and isolated subject cutouts rather than heavy drop shadows. Category cards and buttons employ flat fills with hairline definitions, while circular tap-target buttons sit directly on top of photograph cutouts to establish instant focal priority without blur or shadow artifacts.
IMAGERY
Photography emphasizes authentic, daylight-drenched lifestyle cycling in scenic urban or paved environments, paired with cut-out studio shots of diverse riders. Cutouts must feature riders wearing modern, stylish cycling apparel and helmets, cleanly trimmed against pastel backgrounds. Bike models in category lists must appear in clinical, razor-sharp side profile without background clutter.
SIGNATURE DETAIL — the thing that makes this design itself
Demographic collection cards featuring riders seamlessly cut out and anchored over bespoke soft pastel fields (slate, lilac, sage), punctuated by a lower-left circular floating white forward arrow.
MUST
- Use pastel fills (#DCE5EE, #E8E2F2, #DFE9D3) strictly as soft backdrops for cut-out demographic photography.
- Reserve vibrant vermilion (#F05336) exclusively for key conversion buttons, active indicators, and secondary brand emphasis.
- Enforce a 20px corner radius on major banner and container modules to sustain a soft, friendly mobile aesthetic.
- Maintain clear left-aligned typographic hierarchy in banners using high-contrast black text on top of white gradient scrims.
AVOID
- Do not use dark, heavy container backgrounds; the canvas must stay airy, bright, and outdoor-oriented.
- Avoid applying the vermilion accent color to large background cards—it is strictly an action and highlight color.
- Do not allow photography backgrounds in category cards; rider cutouts must rest cleanly on solid pastel fields.
- Never drop below 12px horizontal screen margins on mobile viewports.
OUTPUT
Render as a clean, pixel-crisp UI design at roughly 1280:3840. Flat vector rendering, real legible text, no browser chrome, no device mockup frame, no watermark, no lorem ipsum placeholder blocks. 在 DraPub 中尝试 
