Chart Prompts

Restyle my chart in the "Chalkboard" 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 science lesson on a classroom chalkboard. Dark green slate, soft eraser smudges, and everything drawn in grainy chalk with pastel accents.

Colors (use these exact values):
- Slate: #1E2A23, inside an 18px wooden frame (vertical gradient #8A5E36 to #6E4726 to #553519, with thin wavy grain lines in #3E2610 at 45%) and a 30px chalk tray along the bottom with a small chalk stick and an eraser.
- Chalk White: #F2F0E6 for the title, axes, tick labels and subtitle (subtitle at 85% opacity, source at 70%).
- Yellow: #F4D35E for reference lines and the key annotation.
- Pink: #F59AB8 and Blue: #6FB8F2 for the two data series. Extra series, if needed: Chalk White, then Yellow.

Typography (Google Fonts):
- Title: Cabin Sketch 700, 40px, Chalk White, underlined with a hand-drawn 3.5px chalk stroke across its full width. Key annotation value: Cabin Sketch 700, 26px, Yellow.
- Everything else: Schoolbell. Subtitle 21px, tick labels 20px, direct series labels 24px in the series color, source line 17px.

Chalk texture (this is what sells the style):
- Put all chalk work in one group with a filter: mask it with fine noise (fractalNoise, baseFrequency 0.85, 2 octaves, alpha 3*a - 0.62) composited "in", roughen the edges with feDisplacementMap (fractalNoise 0.35, scale 2.2), then blur 0.35px.
- Board surface: a faint speckle of fine noise over the slate at 35%, long horizontal eraser smears (fractalNoise 0.003 by 0.022, pale chalk color, blurred 2px, 30% opacity), and a few large soft radial dust clouds (Chalk White at 9% fading to 0).

Axes and grid:
- No gridlines. An L-shaped 3px chalk axis with a slight hand jitter, 14px tick strokes and degree or unit suffixes on the labels. Put the x unit ("min") just past the last tick label.

Marks:
- Line chart: 5px chalk lines with round caps, drawn from many small segments with about 1px of vertical jitter so they look hand-drawn, with 5.5px filled chalk dots at regular intervals. Label each line directly at its end in its color.
- Bar chart: bars as 3px chalk outlines filled with loose diagonal chalk hatching (3px strokes, 8px apart) in the series color, value written above in Schoolbell.
- Reference line: a Yellow dashed (14/10) 2.5px chalk line with a short Yellow label above its right end.
- Key annotation: circle the two points that matter with 11px Yellow chalk rings, drop dashed guides from them, join them with a double-headed Yellow chalk arrow in empty space, and write the difference ("+10 min") in Cabin Sketch next to it.

Avoid: clean vector strokes, pure black or pure white, saturated neon colors, glows, drop shadows, and gridlines.

When you're done, render the chart and zoom in: every stroke and letter should show chalk grain, the pastel series must still be told apart by their direct labels, the annotation arrow must not cross a data line, and nothing should touch the wooden frame.