"Develop a refined minimalist UI using semantic HTML5 and vanilla CSS. Layout: Implement a strict 12-column CSS Grid with gap: 1px using background-color for hairlines. Typography: Use clamp() for fluid responsive headers, font-weight: 900 for hero text and font-weight: 200 for captions. Apply letter-spacing: -0.06em and line-height: 0.9. Visuals: Define :root with #000000 and #ffffff. Use backdrop-filter: blur(20px) for fixed navigation. Interaction: Implement an image hover effect using filter: grayscale(100%) to 0% with a transform: scale(1.05) transition, duration 0.8s and cubic-bezier(0.16, 1, 0.3, 1). Ensure antialiased font rendering."