Chart Prompts

Restyle my chart in the "Particle Detector" style described below. Keep my data, chart type, title meaning and units; change only the presentation. Use the charting library this project already uses (plain SVG if there is none). If the library can't express a detail, draw it in a custom layer instead of dropping it. Measurements assume a 960 x 600 chart; scale them proportionally.

Mood: a figure from a particle physics collaboration's results talk. Data points with error bars, a fitted model, a shaded signal window, a ratio panel underneath and the unmistakable "Preliminary" tag. Rigorous and restrained on a dark slide.

Colors (use these exact values):
- Background: #090C14.
- Data: #FF9D3C (orange) for the step outline and ratio points, with a #FF9D3C fill at 16% under the steps; error bars and bin-center dots in #FFD2A1.
- Fit or model: #F2F4F8 (near white).
- Signal region: #3B82F6 at 20% opacity, full height in both panels (the legend swatch at 45%).
- Frames and ticks: #6B7488. Gridlines #171D2B. Labels #AEB6C6, title #F4F6FA, source #687186.

Typography (Google Fonts):
- IBM Plex Sans: title 600, 25px at x 48, baseline 44, stating the finding; subtitle 400, 14px, #AEB6C6; the tag "Halcyon Preliminary" 17px italic, the experiment name 700 and "Preliminary" 400 in #AEB6C6.
- Fira Code for everything else: tick labels 12px, axis titles 12px ("Events / 0.1 MeV" rotated; "Deposited energy (MeV)" right aligned under the ratio panel), legend 12px #E3E7EF, fit parameters 12px, and the event counter 500, 13px orange inside a 1px orange outlined box (3px radius).

Layout:
- Main panel x 112 to 900, y 104 to 420 with a 1.2px #6B7488 frame; ratio panel directly below at y 440 to 526, same width and frame, sharing the x axis. Inward ticks (7px) every major step on both panels; x labels only under the ratio panel.
- The tag, run and luminosity line, event counter, legend and fit parameters (mu, sigma, chi-square/ndf computed from the data) stack in the emptiest corner of the main panel, left aligned on one x, with a 1px #252C3D rule before the parameters.

Axes and grid:
- Horizontal gridlines 1px #171D2B in the main panel only; y labels right aligned 10px left of the frame. The ratio panel shows 0.8, 1.0 and 1.2 with a 1px #F2F4F8 dashed (4 3) line at 1.0 at 70% opacity.

Marks:
- Bar chart: a histogram drawn as one continuous outline step (1.8px #FF9D3C, miter joins) over a 16% orange fill, with a vertical sqrt(N) error bar (1.3px #FFD2A1) and a 2px dot at each bin center. The fit runs over it as a smooth 2px #F2F4F8 curve. The ratio panel plots data divided by fit as 2.4px orange dots with the scaled error bars.
- Line chart: draw the series as orange points (2.4px radius) with vertical error bars, the model or trend as the 2px near-white curve, and the ratio panel underneath as data over model in the same way. Shade any highlighted range in the signal blue.

Avoid: filled solid bars, gaps between bins, drop shadows, glows, gradients, and more than one warm color.

When you're done, render the chart and check that both panels share the x scale exactly, error bars are visible in low-count bins, the stated event count equals the sum of the bins, and the chi-square/ndf is computed from the drawn data.