The sticky rail on the left mirrors the page: each section is a vertebra, the line between them fills as you read, and the current vertebra lights up. It turns a long money page into a guided walk instead of a wall of text.
The second stop carries the quotable, AI-answer-shaped summary. As it crosses the middle of the viewport its vertebra activates and the fill line reaches it — passed vertebrae stay softly marked.
The condition list below echoes the rail mechanic — numbered discs run down a timeline, each one a condition the treatment helps.
A short plain-language line on how the treatment helps this condition.
Each disc is a stop on the same spine the reader has been following.
Link any of these to their own condition pages in a real build.
The cascade staggers in as the timeline enters the viewport.
Trust content rides here. By the time the reader reaches the final vertebra, the spine is fully lit — a quiet completion cue that lands right beside the booking action.
The completion moment doubles as the conversion moment.
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