Mobile · Auth · Phone entry
Sign in — phone is the identity
First screen a new user sees (and the one returning users see after logout or 30-day expiry). Uber-style single-step: phone number + Continue. Terms are inline disclosure, not a separate screen. Live-event teaser at top creates FOMO. Starter-gift callout sells the upside.
Design Mechanics · Phone entry
Uber-style single-step — phone + terms + starter gift teaser all on ONE screen. No separate Terms screen, no pre-screen welcome slide.
Live-event teaser pill at top — "🧠 Next trivia in 2:00 · 4,218 joined". Signals "this is happening right now and you're about to miss it." Creates urgency on the very first screen, well before any friction.
Big logo, no chrome — no header chips, no nav. The user isn't signed in, so there's nothing to show in those slots. Clean attention on the task.
Headline = the task — "Enter your number" (imperative, clear). Subtext tells them what happens next ("We'll text you a 5-digit code to sign in").
Country + phone row — US +1 preselected with dropdown for others. Phone field is big, tel inputmode (numpad), placeholder shows expected format. Focus state = brand-purple border glow.
Continue CTA — same gradient + shadow treatment as Play-screen CTAs, consistent brand. Arrow reinforces "forward."
Inline terms disclosure — directly under the CTA: "By tapping Continue, you agree to Terms of Service and Privacy Policy, and confirm you're 18+." 18+ matters for future prize contests per MEMORY.md. Links are tappable to full docs but user doesn't have to leave this screen.
Starter gift teaser — "🎁 New players get 500 IQ free to start tonight." Sells the upside. Small but persuasive. For returning-user re-auth this card is hidden (they already have their IQ).
Help footer — "Trouble signing in? Get help" — low-friction support escape hatch without cluttering the main flow.
Returning-user variant — hide the gift teaser, swap headline to "Welcome back" or similar. Terms inline stays (same version lock check). Everything else identical.