Rebuilt chat support widget CSS in foot.php inline styles for v7 compliance and dark mode. Changes: (1) Header — replaced hardcoded blue background with gradient using --bs-primary, flex layout for icon ordering, rounded pill buttons for controls. (2) Message bubbles — user prompts now purple with rounded corners (12px), AI responses get tertiary-bg background with speech-bubble shape. (3) Form container — uses var(--bs-body-bg) for automatic light/dark switching. (4) Open button — uses --bs-primary with shadow and proper z-index. (5) Full dark mode block — [data-bs-theme=dark] overrides for form-container, headerxc, user-prompt, ai-response, open-button, bsdw, StripeElement. (6) Cleaned up foot.php header HTML — headset icon, Online badge, proper button ordering. Verified in both light and dark modes with conversation messages.