The depth styling used a single border-left with `double` for levels 2-3, so level 2 rendered as two hairlines thinner than the level-1 solid bar, level 3 as thicker lines, and levels past 3 had no class at all (depth was capped at 3). A single border can only ever be one bar. Pass the nesting depth to CSS as an inline `--quote-depth` variable and paint the bars with a repeating gradient clipped (via background-size) to exactly that many 3px bars. Every level now adds one more equal-width bar, at any depth, with a dark-theme bar color. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>