\documentclass[tikz,border=2pt]{standalone}
\usepackage{amsmath}
\usetikzlibrary{arrows.meta,calc,positioning}
\definecolor{navy}{HTML}{19324A}
\definecolor{bluefill}{HTML}{EAF1F7}
\definecolor{teal}{HTML}{0B7A75}
\definecolor{tealfill}{HTML}{E5F4F2}
\definecolor{orange}{HTML}{C96A12}
\definecolor{orangefill}{HTML}{FFF0DF}
\definecolor{purple}{HTML}{6E4B8B}
\definecolor{purplefill}{HTML}{F1EBF6}
\definecolor{grayline}{HTML}{697782}
\begin{document}
\begin{tikzpicture}[
 font=\sffamily\scriptsize, >=Latex,
 flow/.style={-{Latex[length=1.7mm]},line width=0.65pt,draw=navy},
 localflow/.style={flow,draw=teal},
 auditflow/.style={flow,draw=purple,dashed},
 box/.style={draw=navy,rounded corners=1.5pt,line width=0.65pt,
 fill=bluefill,minimum height=8mm,align=center,inner sep=2.2pt},
 localbox/.style={box,draw=teal,fill=tealfill},
 auditbox/.style={box,draw=purple,fill=purplefill,dashed},
 note/.style={font=\sffamily\tiny,text=grayline,align=center}
]
\node[anchor=west,font=\sffamily\scriptsize\bfseries,text=navy]
 at (-0.1,3.2) {Prediction path: integrated history plus explicit recent evidence};
\node[align=center,text=navy] (av) at (0.7,2.45)
 {observed full-scene\\audio--video prefix};
\node[box] (omni) at (3.25,2.45) {frozen Qwen2.5-Omni\\8-s maximum context};
\node[box] (global) at (5.95,2.45) {last-four-layer\\global state $G_n$};
\node[align=center,text=teal] (audio) at (0.7,1.23)
 {most recent 1-s\\mixed audio};
\node[localbox] (ae) at (3.25,1.23) {frozen audio encoder\\valid-token mean};
\node[localbox] (ap) at (5.95,1.23) {local projection\\$\widetilde A_n$ + validity};
\node[align=center,text=teal] (video) at (0.7,0.02)
 {recent causal\\person crops};
\node[localbox,dashed] (ve) at (3.25,0.02)
 {frozen visual encoder\\crop / person pooling};
\node[localbox,dashed] (vp) at (5.95,0.02)
 {optional projection\\$\widetilde V_n$ + validity};
\node[box,minimum width=21mm] (fusion) at (8.65,1.23)
 {cutoff-aligned\\fusion head};
\node[box,minimum width=24mm] (out) at (11.55,1.23)
 {$10\!\times\!3$ activity forecast\\0.2--2.0 s};
\draw[flow] (av) -- (omni);
\draw[flow] (omni) -- (global);
\draw[localflow] (audio) -- (ae);
\draw[localflow] (ae) -- (ap);
\draw[localflow,dashed] (video) -- (ve);
\draw[localflow,dashed] (ve) -- (vp);
\draw[flow] (global.east) -- ++(0.30,0) |- (fusion.north);
\draw[localflow] (ap) -- (fusion);
\draw[localflow,dashed] (vp.east) -- ++(0.30,0) |- (fusion.south);
\draw[flow] (fusion) -- (out);
\node[note] at (11.45,0.18)
 {background / invisible wearer / aggregate others};

\draw[grayline,line width=0.45pt] (-0.1,-0.62) -- (12.9,-0.62);
\node[anchor=west,font=\sffamily\scriptsize\bfseries,text=navy]
 at (-0.1,-0.94) {Strictly causal stream at cutoff $t_n$};
\node[anchor=east,text=navy] at (2.05,-1.62) {Omni media};
\foreach \a/\b in {2.3/3.85,3.85/5.4,5.4/6.95} {
 \draw[fill=bluefill,draw=navy,line width=0.55pt]
 (\a,-1.84) rectangle (\b,-1.40);
 \node[text=navy,font=\sffamily\tiny] at ({(\a+\b)/2},-1.62) {completed 2 s};
}
\draw[fill=orangefill,draw=orange,line width=0.65pt]
 (6.95,-1.84) rectangle (8.45,-1.40);
\node[text=orange,font=\sffamily\tiny] at (7.70,-1.62) {observed tail};
\draw[dashed,draw=orange,line width=0.75pt]
 (8.45,-2.95) -- (8.45,-1.10);
\node[anchor=south,text=orange,font=\sffamily\tiny\bfseries]
 at (8.45,-1.10) {cutoff $t_n$};
\node[note,anchor=west] at (8.85,-1.62)
 {replay completed payloads; recompute only\\the temporary tail; exclude future media};
\node[anchor=east,text=teal] at (2.05,-2.31) {local evidence};
\draw[draw=teal,line width=1.8pt] (7.65,-2.31) -- (8.45,-2.31);
\node[note,anchor=west,text=teal] at (8.85,-2.31)
 {one-second causal window, refreshed every 200 ms};
\node[anchor=east,text=navy] at (2.05,-2.86) {decision grid};
\draw[draw=navy,line width=0.6pt] (2.3,-2.86) -- (8.45,-2.86);
\foreach \x in {2.42,2.58,...,8.34} {
 \draw[draw=navy,line width=0.5pt] (\x,-2.95) -- (\x,-2.77);
}

\node[auditbox,minimum width=42mm] (oracle) at (11.02,-2.78)
 {analysis only: past visible-person activity\\aggregate / per-person / delayed / shuffled};
\draw[auditflow] (oracle.north) -- ++(0,0.32) -| (fusion.south);
\node[note,text=purple] at (11.02,-3.35)
 {privileged information audit; never a deployable model input};
\end{tikzpicture}
\end{document}