\documentclass[tikz,border=12pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,arrows.meta}

% Color palette (dark mode compatible)
\definecolor{bg}{HTML}{171C1A}
\definecolor{text}{HTML}{E3E7E4}
\definecolor{textsoft}{HTML}{C8D0CC}
\definecolor{muted}{HTML}{9AA59F}
\definecolor{accent}{HTML}{7AA88A}
\definecolor{humanpink}{HTML}{B08A9A}
\definecolor{border}{HTML}{242E29}

\begin{document}
\begin{tikzpicture}[font=\sffamily]

  % ---------- Explicit bounding box for consistent rendering ----------
  % Design width: 14cm to match other diagrams
  \path[use as bounding box] (-0.5, 0.2) rectangle (13.9, 3.4);

  % ---------- Style definitions ----------

  % Spectrum segments: equal visual weight, no escalation
  % Intentionally understated so slider becomes primary element
  \tikzset{
    segment/.style={
      draw=accent!50,
      line width=0.5pt,
      fill=bg,
      rounded corners=3pt,
      minimum width=2.1cm,
      minimum height=1.0cm,
      align=center,
      text=textsoft,
      font=\sffamily\scriptsize
    }
  }

  % Invariant band: strongest visual element after slider
  % Communicates "always on" across entire spectrum
  \tikzset{
    invariant/.style={
      draw=accent,
      line width=1.2pt,
      fill=bg,
      rounded corners=2pt,
      minimum height=0.55cm,
      align=center,
      text=text,
      font=\sffamily\scriptsize\bfseries
    }
  }

  % ---------- Title (top-left, research-figure style) ----------
  \node[font=\sffamily\normalsize, text=text, anchor=north west] at (-0.3, 3.15)
    {Assistance Spectrum};

  % ---------- Invariant band (bottom, spans full width) ----------
  \node[invariant, minimum width=13.6cm] (invariant) at (6.95, 0.65)
    {Human-Navigable Control of the Decision Space};

  % ---------- Spectrum segments (equal visual weight) ----------
  % GOAL: No ladder/progression — all levels equally valid
  % All levels describe PROPOSALS and STRUCTURING, never execution
  % Understated so slider becomes the primary interactive element

  \node[segment] (s1) at (1.2, 1.65) {Record\\[1pt]\& Organize};
  \node[segment] (s2) at (3.5, 1.65) {Summarize\\[1pt]\& Clarify};
  \node[segment] (s3) at (5.8, 1.65) {Propose\\[1pt]Options};
  \node[segment] (s4) at (8.1, 1.65) {Draft Action\\[1pt]Bundles};
  \node[segment] (s5) at (10.4, 1.65) {Surface\\[1pt]Attention};
  \node[segment] (s6) at (12.7, 1.65) {Simulate\\[1pt]Alternatives};

  % ---------- SLIDER: Primary control surface ----------
  % GOAL: Unmistakably the main interactive element
  % Reads as adjustable, temporary, not fixed

  % Slider track: prominent, high contrast
  \draw[draw=accent!70, line width=3.5pt, line cap=round] (1.2, 2.28) -- (12.7, 2.28);

  % Triangle selector: downward-pointing, prominent, pink accent
  % Positioned at "Propose Options" as example current state
  \fill[humanpink] (5.55, 2.28) -- (6.05, 2.28) -- (5.8, 2.05) -- cycle;
  \draw[draw=text, line width=0.8pt] (5.55, 2.28) -- (6.05, 2.28) -- (5.8, 2.05) -- cycle;

  % Bidirectional arrows near selector: communicate adjustability/reversibility
  \draw[{Stealth[length=4pt, width=3pt]}-{Stealth[length=4pt, width=3pt]},
        draw=muted!80, line width=0.6pt] (4.9, 2.28) -- (5.45, 2.28);
  \draw[{Stealth[length=4pt, width=3pt]}-{Stealth[length=4pt, width=3pt]},
        draw=muted!80, line width=0.6pt] (6.15, 2.28) -- (6.7, 2.28);

  % Label with arrows: indicates adjustability
  \node[font=\sffamily\scriptsize, text=text, anchor=south] (currentlabel) at (5.8, 2.30)
    {Current Level};
  \draw[-{Stealth[length=3pt, width=2.5pt]}, draw=text, line width=0.5pt]
        ($(currentlabel.west)+(-0.08,0)$) -- ($(currentlabel.west)+(-0.35,0)$);
  \draw[-{Stealth[length=3pt, width=2.5pt]}, draw=text, line width=0.5pt]
        ($(currentlabel.east)+(0.08,0)$) -- ($(currentlabel.east)+(0.35,0)$);

\end{tikzpicture}
\end{document}
