Files
Vijay Janapa Reddi 44baf0c757 polish(tinytorch): sidebar titles + HTML milestone removal + flat tier
cards + header decoration + PDF milestone transitions

Polishes several rough edges in the TinyTorch site surfaced by a visual
walkthrough. Six independent fixes in one PR because they all landed on
the same mental pass:

HTML SIDEBAR
  - Rename two sections so their titles don't wrap on the 250px sidebar:
      "Capstone Competition"  -> "Capstone"
      "TITO CLI Reference"    -> "TITO CLI"
      (navbar link "TITO CLI Reference" -> "TITO CLI" too, for
       consistency)
  - Remove all three milestone sections ("Foundation Milestones",
    "Architecture Milestones", "Optimization Milestones") from the HTML
    sidebar. They interleaved between tiers and broke the
    Foundation -> Architecture -> Optimization -> Capstone flow the
    sidebar is meant to communicate. Milestones stay fully accessible
    via the navbar's "Historical Milestones" entry, and the PDF build
    (which has its own _quarto.yml) is untouched -- interleaved
    milestones are the correct reading experience in print.
  - YAML comment added where the milestone sections used to live so a
    future contributor knows the removal was intentional.

SIDEBAR SCROLL
  - shared/styles/partials/_sidebar.scss: add
    `overscroll-behavior: contain` to #quarto-sidebar and
    .sidebar-navigation. Before: hovering-and-scrolling over the sidebar
    chained the scroll to the body the moment the sidebar hit a
    boundary -- so scrolling the sidebar felt like it was never actually
    engaging. After: the sidebar's scroll stays in the sidebar.
  - Single-source-of-truth win: this improves every Quarto site in the
    ecosystem (book/kits/labs/mlsysim/tinytorch/site), not just tinytorch.

H2 L-SHAPE DECORATION (TINYTORCH ONLY)
  - shared/styles/partials/_headers.scss decorates H2-H6 with a thick
    accent left-border + thin accent bottom line -- an "L-shape" that
    reads well in long-form textbook prose. For tinytorch (framework
    docs with code blocks, comparison grids, card-based layouts) the
    decoration felt heavy and competed with the content itself.
  - tinytorch/quarto/assets/styles/style.scss: add a local override
    that strips border-left/border-bottom/padding-left/padding-bottom
    from H2-H6. Scoped to tinytorch -- book/kits/labs/mlsysim keep the
    decoration.

TIER CARDS
  - index.qmd's .tier-foundation / .tier-architecture /
    .tier-optimization / .tier-olympics cards used four different
    gradient fills (blue/purple/orange/pink). Visually loud; fought
    the comparison grid and hero on the same page; tier-optimization
    read as specifically orange-heavy.
  - Flatten to the same neutral #fafafa fill the .audience-card and
    preface.qmd cards use, with just a 4px colored left-border carrying
    the tier's identity. Each tier still has its distinct color cue;
    the page calms down.

PDF NARRATIVE TRANSITIONS
  Milestones appeared suddenly in the PDF when a tier ended. Readers
  lost context for why they were there and which just-built modules
  they were about to exercise. Six short transition paragraphs added
  via the narrative-flow-analyzer subagent:

    modules/08_training.qmd    forward-hook into Foundation Milestones
    modules/13_transformers.qmd forward-hook into Architecture Milestones
    modules/19_benchmarking.qmd forward-hook into Optimization Milestone
    milestones/01_perceptron.qmd tier-components open
                                 (Tensor/Linear/BCELoss/SGD/Trainer)
    milestones/04_cnn.qmd       first-Architecture-Milestone framing +
                                 three-tier arc explanation
    milestones/06_mlperf.qmd    sole-Optimization-Milestone +
                                 "third act" framing

  Files left as-is because the transitions were already good:
    milestones/index.qmd, milestones/02_xor.qmd, milestones/03_mlp.qmd,
    milestones/05_transformer.qmd.

DRIVE-BY FIX
  modules/13_transformers.qmd had four lines of pre-existing corrupted
  trailing content after the last callout (duplicate sentence,
  orphan "44B parameters |" table row, orphan Capstone row). Removed
  since this PR was already editing the file.

Verification (Playwright against local preview):
  - Sidebar section labels: ["Getting Started", "Foundation Tier",
    "Architecture Tier", "Optimization Tier", "Capstone",
    "Conclusion", "TITO CLI", "Reference", "Community"] -- no
    wrapping, no milestones.
  - #quarto-sidebar overscroll-behavior: "contain"
  - H2 "Don't import it. Build it." computed border-left-width: 0px,
    border-bottom-width: 0px, padding-left: 0px
  - .tier-card backgrounds: all rgb(250, 250, 250);
    border-lefts: 4px solid {tier-color} each.
2026-04-24 16:01:11 -04:00
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