# Folder tabs

> The active tab rises and joins the panel underneath, like the tab on a paper folder.

- Category: [Filters](https://library.aimran.es/components/filters)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-f-tabs-folder
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

Good for detailed pages where each tab hides real content. The product page of a hardware store, with Description, Specs and Shipping, or a client record in a small CRM with Summary, Details and Notes. Because tab and panel read as one piece, nobody wonders what belongs where. It's what most people mean by folder-style tabs in CSS.

The effect depends on the tab and the panel sharing exactly the same background, so change both together. It feels a little traditional, which is a plus for business tools and a minus for a playful brand.

## Code

### HTML

```html
<div class="uv-ftk"><div class="tb"><button class="on">Overview</button><button>Details</button><button>Notes</button></div><div class="pn">Panel content</div></div>
```

### CSS

```css
.uv-ftk {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-ftk {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-width: 18em;
}

.uv-ftk .tb {
  display: flex;
  gap: .3em;
  align-items: flex-end;
  padding: 0 .6em;
}

.uv-ftk button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  border-radius: .8em .8em 0 0;
  padding: .65em 1.15em;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  transition: all calc(0.35s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ftk button:hover {
  color: var(--fg);
  transform: translateY(-2px);
}

.uv-ftk button.on {
  color: var(--c1);
  background: var(--bg);
  padding-bottom: .95em;
  margin-bottom: -.3em;
  box-shadow: 0 -6px 16px rgba(0,0,0,.08);
}

.uv-ftk .pn {
  padding: 1.4em;
  border-radius: 0 0 1em 1em;
  background: var(--bg);
  box-shadow: 0 10px 28px rgba(0,0,0,.09);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  font-size: calc(var(--s) * .92);
}
```

### JavaScript

```js
document.querySelectorAll(".uv-ftk").forEach(el => {
  el.querySelectorAll("button").forEach((b,i)=>b.addEventListener("click",()=>{el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("on");el.querySelector(".pn").textContent=["Panel content","Item details","Your private notes"][i]}))
});
```

### React

```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-ftk {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-width: 18em;
}

.uv-ftk .tb {
  display: flex;
  gap: .3em;
  align-items: flex-end;
  padding: 0 .6em;
}

.uv-ftk button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  border-radius: .8em .8em 0 0;
  padding: .65em 1.15em;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  transition: all calc(0.35s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ftk button:hover {
  color: var(--fg);
  transform: translateY(-2px);
}

.uv-ftk button.on {
  color: var(--c1);
  background: var(--bg);
  padding-bottom: .95em;
  margin-bottom: -.3em;
  box-shadow: 0 -6px 16px rgba(0,0,0,.08);
}

.uv-ftk .pn {
  padding: 1.4em;
  border-radius: 0 0 1em 1em;
  background: var(--bg);
  box-shadow: 0 10px 28px rgba(0,0,0,.09);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  font-size: calc(var(--s) * .92);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  el.querySelectorAll("button").forEach((b,i)=>b.addEventListener("click",()=>{el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("on");el.querySelector(".pn").textContent=["Panel content","Item details","Your private notes"][i]}))
}

export default function FTabsFolder() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-ftk"><div className="tb"><button className="on">Overview</button><button>Details</button><button>Notes</button></div><div className="pn">Panel content</div></div>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “Folder tabs” block (Filters) from AIMRAN Library to my project.

## What it is
The active tab rises and joins the panel underneath, like the tab on a paper folder.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-ftk {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-width: 18em;
}

.uv-ftk .tb {
  display: flex;
  gap: .3em;
  align-items: flex-end;
  padding: 0 .6em;
}

.uv-ftk button {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  font-weight: 550;
  line-height: 1;
  padding: .72em 1.25em;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--fg);
  position: relative;
  transition: color calc(0.32s / var(--k)) cubic-bezier(.25,.1,.25,1),transform calc(0.32s / var(--k)) cubic-bezier(.34,1.56,.64,1);
  border-radius: .8em .8em 0 0;
  padding: .65em 1.15em;
  background: color-mix(in srgb,var(--fg) 7%,transparent);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  transition: all calc(0.35s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-ftk button:hover {
  color: var(--fg);
  transform: translateY(-2px);
}

.uv-ftk button.on {
  color: var(--c1);
  background: var(--bg);
  padding-bottom: .95em;
  margin-bottom: -.3em;
  box-shadow: 0 -6px 16px rgba(0,0,0,.08);
}

.uv-ftk .pn {
  padding: 1.4em;
  border-radius: 0 0 1em 1em;
  background: var(--bg);
  box-shadow: 0 10px 28px rgba(0,0,0,.09);
  color: color-mix(in srgb,var(--fg) 60%,transparent);
  font-size: calc(var(--s) * .92);
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  el.querySelectorAll("button").forEach((b,i)=>b.addEventListener("click",()=>{el.querySelectorAll("button").forEach(x=>x.classList.remove("on"));b.classList.add("on");el.querySelector(".pn").textContent=["Panel content","Item details","Your private notes"][i]}))
}

export default function FTabsFolder() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <div className="uv-ftk"><div className="tb"><button className="on">Overview</button><button>Details</button><button>Notes</button></div><div className="pn">Panel content</div></div>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````