Implement Option C logo cropped with minimal borders

Convert logo to SVG vector format for infinite 4K resolution and LFS-free deployment

Implement new 3D glossy logo (Variant 1) across the entire application and favicon

Fix UI responsiveness for mobile and tablet devices

Redesign UI: improved welcome screen and login/register page

Redesign welcome screen with animated orbs, feature strip and polished suggestion cards

Allow VITE_API_BASE_URL to configure production backend URL

Initial commit