My Shopify store needs rapid repair and polish. Every core area—homepage, product pages, and even checkout—goes out of alignment on several screen sizes, making the layout unresponsive. Alongside the visual glitches, certain cart and discount features behave unpredictably, hinting at deeper functionality problems. I need someone who can dig into Liquid, HTML, SCSS, and JavaScript, trace these design, functionality, and performance faults, and ship stable fixes within the next 3–5 days. Acceptance criteria: • Homepage, product pages, and checkout display and respond correctly on modern desktop and mobile browsers. • Cart drawer, discount logic, and other interactive scripts return zero console errors. • No new visual or functional regressions appear elsewhere in the theme. • Updates are delivered through Git or a duplicate theme so I can review before going live. If you are confident you can turn this around on the timeline, tell me when you can start and how you plan to tackle the debugging.