using Markdown

md"""
# Hello, Sessions.jl

Welcome to your first Sessions.jl notebook! This notebook demonstrates the basics of reactive notebooks in Julia.

Sessions.jl notebooks are **Pluto-compatible** — they use the same `.jl` file format and reactive execution model. You can write them in the terminal TUI or export them as static web pages like this one.
"""

x = 1 + 1

greeting = "The answer is $(x)"

md"""
## Reactive Execution

When you change a cell, Sessions.jl automatically re-runs all cells that depend on it. This is powered by **ExpressionExplorer.jl** and **PlutoDependencyExplorer.jl** from the Pluto ecosystem.

Try thinking of each cell as a node in a dependency graph — upstream changes flow downstream automatically.
"""

function fibonacci(n)
    if n <= 1
        return n
    end
    a, b = 0, 1
    for _ in 2:n
        a, b = b, a + b
    end
    return b
end

fibonacci(10)

fib_sequence = [fibonacci(i) for i in 1:10]