Sleeve

Sleeve's design evokes a polished, app-native desktop experience, blending macOS aesthetics with thoughtful detail. Its most distinctive feature is the interplay between sharp, angular content blocks and the soft, organic forms of the app's UI elements, specifically the deeply rounded 'pill' buttons and window-like card backgrounds. Typography is restrained and precise, anchored by system sans-serif fonts, ensuring legibility and a familiar feel. Shadows are crucial here, providing subtle elevation to card-like containers, mimicking floating UI elements without heavy borders, creating depth while maintaining a clean, white background. Prioritize ui-sans-serif at weight 900 for all large display headings (48px, 96px) with tightened letter-spacing (-0.96px, -2.4px) for impact. Use Border Fog (#e5e7eb) for all visible borders on cards and buttons, maintaining a soft, consistent edge. Apply 24px border-radius to all content cards and product display elements to create a consistent 'app window' aesthetic. Elevate primary content cards using the comprehensive shadow stack of rgba(0, 0, 0, 0.1) 0px 0px 0px 1px, rgba(0, 0, 0, 0.4) 0px 12px 24px -8px, rgba(0, 0, 0, 0.2) 0px 8px 24px 0px, rgba(0, 0, 0, 0.2) 0px 2px 4px 0px. Utilize 9999px border-radius for all interactive pill-shaped elements and tags to signify interactivity and a distinct form language. Maintain a clear page structure using a max-width of 1264px for content and section gaps of approximately 96px for breathing room. Employ Deep Sea Gradient (linear-gradient(to right top, rgb(14, 149, 238), rgb(39, 201, 245))) for primary hero sections or prominent visual accents to infuse vibrancy. Avoid using harsh, high-contrast borders; all borders should be subtle, like Border Fog (#e5e7eb) or a similar desaturated gray. Do not introduce strong, saturated colors for backgrounds of major content sections; stick to White Marble (#ffffff) or Cloud Gray (#f9fafb). Refrain from using heavily decorative fonts; ui-sans-serif is the sole typographic voice, emphasizing clarity and system-level integration. Avoid arbitrary rounding; use 24px for cards, 12px for primary/secondary buttons, and 9999px for pill-shaped elements exclusively. Do not clutter layouts with too many differing shadow styles; adhere to the defined card elevation shadows. Exclude any imagery that is not either a product screenshot, a UI icon, or an abstract graphic; avoid lifestyle photography. Do not use letter-spacing on body text; it should primarily be applied to large headings for stylistic effect.