repeated-component-alignment

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# Repeated Component Alignment

When a component is rendered many times — a card grid, a list, a table, a nav menu, a row of KPI tiles, a feed — it stops being a single box and becomes a **pattern**. The value of a pattern is rhythm: the eye learns the layout once and scans the same slot across every instance (the title row, the price row, the action row). Variable content length breaks that rhythm unless the component is built to absorb it.

The principle is general. A **card** is the most common case, but the same rule governs list rows, table cells, nav items, tiles, comment entries, dashboard widgets, search results — anything repeated. Treat each as a **fixed slot model**, not a free-form container.

The goal: **content of any length, instances that look identical.** This is partly content production (write to a target length) and partly layout engineering (build slots that tolerate the variance). This skill covers the layout half and where the two meet.

---

## The Slot Model

Name the slots once and treat them as a contract every instance honours. A product card, as a worked example:

```
┌──────────────────────┐
│ [media]              │  ← fixed aspect ratio
│                      │
├──────────────────────┤
│ ● Badge              │  ← optional slot, space reserved
│ Title                │  ← clamp to N lines
│ Subtitle / meta      │
│                      │
│ Description text…    │  ← flexible slot, grows
│                      │
├──────────────────────┤
│ €19.99      Read more│  ← anchor, pinned to bottom
└──────────────────────┘
```

The same three rules apply to a **list row** (avatar · name · meta · status pinned right), a **KPI tile** (label · big number · trend pinned bottom), or a **search result** (title · url · snippet clamped):

- **Every slot has a fixed position**, whether or not it has content in a given instance.
- **One slot absorbs the variance** (usually the description/snippet). All others are fixed or clamped.
- **Anchor elements are pinned** — the primary action or value (CTA, price, status, trend) sits at the same position in every instance regardless of how much content is above or beside it.

---

### Controls That Swap by State

A cell that shows a different control per state — a button, then an input, then a value or link — is still one slot. Give each position a fixed width and stretch whatever control it holds to fill it. The same position carries the same role in every row and every state. Content-sized controls change width with their label, so the row reflows, neighbouring controls move under the cursor, and the column stops reading as one list.

## Aligning the Anchor

The single most common defect: text of different lengths makes the anchor element (a "Read more" link, a price, a status chip) float to a different position in each instance. Fix it by letting the flexible slot grow and pushing the anchor to a fixed edge.

**Vertical layout (cards, tiles) — pin the footer to the bottom:**

```css
.item {
  display: flex;
  flex-direction: column;
  height: 100%;            /* fill the grid/flex track */
}

.item__media {
  aspect-ratio: 4 / 3;     /* never let media height vary */
  object-fit: cover;
}

.item__description {
  flex: 1;                 /* the flexible slot absorbs the slack */
}

.item__footer {
  margin-top: auto;        /* pin the anchor (price + CTA) to the bottom */
}
```

For instances to be **equal height as siblings**, the container track must stretch them — CSS Grid and Flex do this by default (`align-items: stretch`). Then `height: 100%` makes each instance fill its track, and `margin-top: auto` aligns every footer.

```css
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  /* align-items: stretch is the default — do not override it */
}
```

**Horizontal layout (list rows, table cells) — pin the anchor to the right:**

```css
.row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.row__title {
  flex: 1;                 /* title absorbs the width variance */
  min-width: 0;            /* REQUIRED for the title to be allowed to shrink/ellipsis */
}
.row__status {
  margin-left: auto;       /* status pinned to the right edge */
}
```

Do **not** force equal size with a hard-coded `height` — the tallest natural instance sets the size, and content beyond it clips or overflows. Let the track stretch and pin the anchor.

---

## Reserve Space for Optional Slots

A slot that appears in some instances and not others — a badge, a discount label, a "verified" tick — shifts everything after it on the instances that have it, breaking alignment. Two fixes:

1. **Reserve the slot** — always render the container at a fixed size, empty when there is no content:

```css
.item__badge-row {
  min-height: 24px;        /* always occupies the row */
}
```

2. **Overlay the slot** — position it absolutely so it never participates in the flow:

```css
.item__badge {
  position: absolute;
  top: var(--space-2);

From dembrandt/dembrandt-skills, MIT.

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