A focused split-screen sign-in: email and password form with SSO and a forgot link on the left, an abstract branded panel with a customer quote on the right.
Design a desktop sign-in screen for a product called Halcyon, dark and split down the middle.
Left half is the form, vertically centered, comfortable max width around 380px. Small wordmark and logo at the top, then a heading "Welcome back" with a line under it "Sign in to your Halcyon workspace." Two SSO buttons side by side first (Continue with Google, Continue with GitHub) with little inline marks, then a hairline "or" divider. Below that, an email field (pre-filled with a real-looking address) and a password field with a show/hide eye and a "Forgot?" link sitting on the same row as the password label. The email field should look already-valid with a tiny check. Then a full-width amber "Sign in" button, and under it "New to Halcyon? Create an account." Tuck a tiny footer at the very bottom of the column with terms and privacy links.
Right half is a branded panel, not a form. Give it a soft amber radial glow over near-black, a tasteful abstract visual built from concentric rings or flowing lines in CSS or inline SVG, and a short customer testimonial near the bottom: a quote, a name, a role, and an avatar with initials. Maybe a small row of logos or a rating.
One amber accent (#f59e0b). Near-black surfaces, hairline 1px borders, generous spacing, focus ring on the active field. Linear / Stripe grade restraint, nothing garish.