Build a single self-contained HTML file for "CarbonCampus": a platform helping university students track and reduce their carbon footprint, aligned with UN Sustainable Development Goals.
Include: hero section with bold headline and "Start Tracking" CTA, "How It Works" (3 steps with icons), 4 feature cards (carbon tracking, campus challenges, SDG dashboard, community leaderboard), email signup form, and footer with social links.
Design: emerald green (#10b981) on dark backgrounds, Google Fonts (Sora + DM Sans), smooth scroll-triggered animations, mobile-responsive. Make it visually impressive and production-quality.
* This prompt was refined with AI to ensure reproducibility. Your real prompts will usually be shorter and less detailed.