--- /dev/null
+# Adaptive Repository Grid Design
+
+**Date:** 2026-04-28
+**Branch:** `feature/adaptive-repo-grid`
+**Worktree:** `.worktrees/adaptive-repo-grid`
+
+## Context
+
+The repository page (`themes/danix-xyz-hacker/layouts/repository/single.html`) has a hardcoded `grid-cols-1 md:grid-cols-2 lg:grid-cols-3` layout for Slackware package repo cards. The card data lives in `data/repos.yaml`. When only 1 repo is defined, the card stretches full width — visually poor. When 2 repos are defined, the 3-col grid leaves an empty slot. Maintainability: adding or removing repos from the YAML file requires manual CSS adjustment.
+
+**Goal:** Grid adapts automatically to however many repos are in `data/repos.yaml`. No Hugo template logic required for N > 1. Single-repo edge case handled by CSS `:only-child`.
+
+## Design
+
+### Approach: CSS `auto-fit/minmax` + `:only-child`
+
+Replace the fixed Tailwind grid with a semantic CSS class backed by a custom rule:
+
+**Grid container** (`auto-fit` handles 2+ repos automatically):
+```css
+.repo-grid {
+ display: grid;
+ grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+ gap: 1.5rem;
+}
+```
+
+**Single-card centering** (fires only when exactly 1 card is in the grid):
+```css
+.repo-card:only-child {
+ max-width: 50%;
+ margin-inline: auto;
+}
+```
+
+The `:only-child` rule fires only when the element has no siblings inside the grid — safe for 2, 3, N repos. If a non-card element is ever added inside `.repo-grid`, this rule still works correctly as long as there is only one `.repo-card`.
+
+### Responsive behaviour by count
+
+| Repos | Result |
+|-------|--------|
+| 1 | Card centered, 50% container width |
+| 2 | Two equal columns (each ~50%) |
+| 3 | Three equal columns (~33% each) |
+| 4+ | Wraps to new rows, min 280px per card |
+
+On small screens `minmax(280px, 1fr)` collapses to a single column naturally — no breakpoint overrides needed.
+
+## Files to Modify
+
+**Theme repo** (`/home/danix/Programming/GIT/danix2-hugo-theme/`):
+
+1. `layouts/repository/single.html` — replace `grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6` class on wrapper div with `repo-grid`; add `repo-card` class to each card div
+2. `assets/css/main.css` — add `.repo-grid` and `.repo-card:only-child` rules
+
+**Content repo** (`/home/danix/Programming/GIT/danix.xyz-hacker-theme/`):
+
+3. After CSS change: run `npm run build` to recompile `main.min.css`
+4. Commit theme changes, push theme repo, bump submodule pointer in content repo
+
+## Verification
+
+1. `data/repos.yaml` — test with 1 entry: card should be centered at ~50% width
+2. `data/repos.yaml` — test with 2 entries: two equal-width columns
+3. `data/repos.yaml` — test with 3 entries: three equal-width columns (current default)
+4. Resize viewport to mobile: all counts collapse to single column
+5. `hugo server` from worktree root (after `git submodule update --init`) to preview live
