AI Image Generator UI

Build a "Core Features" marketing section as a single centered component with three gradient cards. Use the Inter font family (weights 400, 500, 600) loaded from Google Fonts: `https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap`.

**Page shell:**
- Body: white background `#ffffff`, 80px top/bottom + 20px left/right padding, flex centered, Inter font.
- Global reset: `* { box-sizing: border-box; margin: 0; padding: 0; }`.

**Container (`.c1-container`):** max-width 1100px, full width, text-align center.

**Header block:**
- Badge (`.c1-badge`): text "Core Features", 0.75rem, weight 600, uppercase, letter-spacing 1px, gradient text using `linear-gradient(90deg, #F5C344, #F28482, #B567C2)` with `-webkit-background-clip: text` and transparent fill. 16px bottom margin.
- Title (`.c1-title`): "Built for Speed & Quality", font-size 2.75rem, weight 500, color `#0f172a`, letter-spacing -0.02em, 12px bottom margin.
- Subtitle (`.c1-subtitle`): "Everything you need to go" + `<br>` + "from idea to image", 1.125rem, color `#64748b`, line-height 1.5, 50px bottom margin.