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    02 · Concept

    Ten principles senior engineers design by

    Assume 1.5 million people chase about 60,000 berths at 10:00. Where do you start?

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    1. 60-second story 9 cards · 1 minOne idea per card. Tap through it like stories.(done)
    2. Quick check 3 questions · 1 minTap an answer, get instant feedback.(done)
    3. Go deeper 10 min4 estimates, 2 build-up diagrams and 4 “you’re the candidate” moments.(done)
    4. Full breakdown 20 min · 5 figuresThe complete breakdown, every number and figure.(done)

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