# HNF Stack — Design System

## Visual Language

The stack uses a **split chrome / content** approach:

- **Sidebar / shell chrome** — dark navy (`#1a1a2e`). This is the brand anchor. It stays dark regardless of the content area.
- **Content area** — light grey body (`#f4f5f7`), white cards with subtle shadows. Readable for data-heavy pages and matches the aesthetic of the Kitchen Flash app that preceded this stack.
- **Standalone login screens** — full-screen dark (`#0f0f20` body, `#1a1a2e` card). Intentional contrast; feels like signing into something, not just another content page.

The gold accent (`#c9a84c`) is used sparingly: active nav indicator, primary action buttons, pinned/flagged items, update badges. It reads as the hotel brand colour on both dark and light surfaces.

---

## CSS Variables

Every app in the stack must include this `:root` block verbatim in its `index.css`. Do **not** invent new colour values — add a variable here if the palette genuinely needs extending.

```css
:root {
  /* ── Shell chrome (dark) ── */
  --navy:        #1a1a2e;   /* sidebar background, dark login card */
  --navy-dark:   #0f0f20;   /* login page background */
  --gold:        #c9a84c;   /* accent: active nav, primary buttons, badges */
  --gold-light:  #e8c96d;   /* gold hover/highlight variant */
  --surface:     rgba(255,255,255,0.07);  /* active nav item background */
  --surface-2:   rgba(255,255,255,0.08);  /* sidebar dividers / borders */
  --text:        rgba(255,255,255,0.88);  /* sidebar / dark-bg text */
  --text-muted:  rgba(255,255,255,0.48);  /* sidebar muted text */

  /* ── Content area (light) ── */
  --body-bg:     #f4f5f7;   /* page background */
  --card-bg:     #ffffff;   /* card / panel background */
  --card-border: #e4e8ee;   /* card border, input border */
  --text-dark:   #1e293b;   /* primary text on light backgrounds */
  --text-mid:    #64748b;   /* muted / secondary text on light backgrounds */
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.08);

  /* ── Shared ── */
  --danger:      #dc2626;   /* error states, destructive actions */
  --radius:      10px;      /* standard border radius */
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  background: var(--body-bg);
  color: var(--text-dark);
  font-family: var(--font);
}
```

---

## Colour Usage Guide

| Situation | Variable |
|---|---|
| Page / content background | `--body-bg` |
| Card / panel background | `--card-bg` |
| Card / input border | `--card-border` |
| Primary text (light bg) | `--text-dark` |
| Secondary / muted text (light bg) | `--text-mid` |
| Primary text (dark bg / sidebar) | `--text` |
| Muted text (dark bg / sidebar) | `--text-muted` |
| Primary action button | `background: var(--gold); color: var(--navy)` |
| Destructive action | `var(--danger)` |
| Success state | `#16a34a` (green-600) |
| Warning / running state | `#d97706` (amber-600) |
| Status badge — success | `background: #dcfce7; color: #16a34a` |
| Status badge — failed | `background: #fee2e2; color: var(--danger)` |
| Status badge — running | `background: #fef9c3; color: #ca8a04` |
| Terminal / code output | `background: #1e293b; color: #94a3b8` |

---

## Icons

Use **Lucide React** (`lucide-react` npm package) for all icons. Do not use emoji as functional UI elements.

```bash
npm install lucide-react
```

```tsx
import { ChefHat, ClipboardList } from 'lucide-react'

<ChefHat size={20} strokeWidth={1.75} color={app.theme_color} />
```

**Conventions:**
- `size`: 14–16px for inline/nav icons, 20–28px for tile/feature icons
- `strokeWidth`: always `1.75` (the default is 2, which reads slightly heavy)
- Nav icons inherit `color` from the parent element (let CSS handle active state)
- App tile icons use the app's `theme_color` from the DB

**App icon registry** (Lucide name → app slug):

| App | Lucide name |
|---|---|
| Noticeboard | `ClipboardList` |
| Kitchen Flash | `ChefHat` |
| Cash Up | `Banknote` |
| Housekeeping | `BedDouble` |
| Forecasting | `TrendingUp` |
| Rate Scraper | `Tag` |

Stored in `apps.icon` column in the auth DB. The portal renders them via `AppIcon` component (`portal/src/components/AppIcon.tsx`).

---

## Typography

No custom typeface — system font stack only. This avoids a font load and looks native on every device.

| Use | Size | Weight |
|---|---|---|
| Section heading | `0.95rem` | `600` |
| Card title | `0.88–0.95rem` | `600` |
| Body text | `0.875rem` | `400` |
| Small / meta | `0.72–0.78rem` | `400` |
| Label / tag | `0.65rem` | `500–700`, uppercase, `letter-spacing: 0.04em` |
| Monospace (hashes, IDs) | `0.72rem`, `font-family: monospace` | `400` |

---

## Card Pattern

Every content card follows this pattern:

```tsx
<div style={{
  background: 'var(--card-bg)',
  border: '1px solid var(--card-border)',
  borderRadius: 'var(--radius)',
  boxShadow: 'var(--shadow-sm)',
  padding: '1rem 1.125rem',
}}>
```

Use `borderLeft: '3px solid <colour>'` to add a status accent stripe on the left edge. Use `var(--shadow-md)` on hover.

---

## Input Pattern

```tsx
const inputStyle: React.CSSProperties = {
  background: 'var(--body-bg)',
  border: '1px solid var(--card-border)',
  borderRadius: '7px',
  color: 'var(--text-dark)',
  padding: '0.6rem 0.75rem',
  fontSize: '0.9rem',
  width: '100%',
  outline: 'none',
}
```

On focus, add `border-color: var(--gold)` via CSS or inline `onFocus`.

---

## Button Patterns

**Primary action** (e.g. submit, open, update):
```tsx
style={{
  background: 'var(--gold)', color: 'var(--navy)',
  border: 'none', borderRadius: '7px',
  padding: '0.45rem 1rem', fontSize: '0.82rem', fontWeight: 600,
}}
```

**Secondary / ghost** (e.g. refresh, cancel):
```tsx
style={{
  background: 'var(--card-bg)', color: 'var(--text-mid)',
  border: '1px solid var(--card-border)', borderRadius: '7px',
  padding: '0.35rem 0.9rem', fontSize: '0.8rem',
}}
```

**Icon button** (e.g. pin, delete):
```tsx
style={{
  background: 'var(--body-bg)', border: '1px solid var(--card-border)',
  borderRadius: '6px', padding: '0.3rem',
  color: 'var(--text-mid)',
  display: 'flex', alignItems: 'center', justifyContent: 'center',
}}
```

---

## Hotel Name

The hotel name is injected at build time via a Vite env var:

```
VITE_HOTEL_NAME=Number Four at Stow
```

Set in `/opt/<app>/.env` on the server before rebuilding. Reference it in any component with:

```tsx
{import.meta.env.VITE_HOTEL_NAME}
```

Each app's `Dockerfile` must declare it as a build arg with the default:

```dockerfile
ARG VITE_HOTEL_NAME="Number Four at Stow"
ENV VITE_HOTEL_NAME=$VITE_HOTEL_NAME
```

And `docker-compose.yml`:

```yaml
build:
  context: .
  args:
    VITE_HOTEL_NAME: ${VITE_HOTEL_NAME:-Number Four at Stow}
```

Add `src/vite-env.d.ts` so TypeScript knows about it:

```ts
/// <reference types="vite/client" />
interface ImportMetaEnv { readonly VITE_HOTEL_NAME: string }
interface ImportMeta { readonly env: ImportMetaEnv }
```

---

## App Checklist (new app)

- [ ] Copy the full `:root` CSS block above into `src/index.css`
- [ ] Install `lucide-react`, pick an icon, add it to `apps.icon` in auth DB
- [ ] Add `VITE_HOTEL_NAME` build arg to `Dockerfile` and `docker-compose.yml`
- [ ] Add `src/vite-env.d.ts`
- [ ] Set `base: '/your-path/'` in `vite.config.ts`
- [ ] All API calls use the base path prefix (e.g. `/your-path/api/...`)
- [ ] Standalone login screen: explicit `background: var(--navy-dark)` on outer container
- [ ] Content area: `--body-bg` / `--card-bg` / `--card-border` / `--text-dark` / `--text-mid`
- [ ] No hardcoded colour hex values in component files — variables only