Phase 1 — Tauri v2 Scaffold + IPC Verification

• Node.js (v18+) and npm
• Rust toolchain (rustup, cargo)
• Tauri v2 CLI (cargo install tauri-cli --version "^2")
• A code editor

Step 1: Initialize the Tauri v2 Project

Use the Tauri v2 scaffolder:

npm create tauri-app@latest cuyamaca -- --template react-ts
cd cuyamaca
npm install

This gives you src/ (React frontend) and src-tauri/ (Rust backend). Verify it builds:

npm run tauri dev

You should see an empty Tauri window. Kill it and proceed.

Step 2: Establish the Directory Structure

Organize both sides of the app for the full build:

src/
├── commands/          # Tauri command wrappers (TS calls to Rust)
│   └── index.ts
├── components/        # Reusable UI components
│   ├── Sidebar.tsx
│   ├── PartsPanel.tsx
│   ├── StatusDot.tsx
│   └── GlassPanel.tsx
├── views/             # Full-page views swapped in main area
│   ├── ManifestView.tsx
│   ├── CodeView.tsx
│   └── ChatView.tsx
├── styles/
│   └── globals.css    # Theme variables, glass classes, base styles
├── App.tsx
└── main.tsx

src-tauri/src/
├── commands/          # Tauri command handlers
│   ├── mod.rs
│   └── debug.rs       # ping command for IPC verification
├── services/          # External service abstractions
│   └── mod.rs
├── lib.rs             # Tauri app builder, state registration, command registration
└── main.rs            # Entry point

Create all directories and stub files now. Views can render placeholder text ("Manifest View", "Code View", "Chat View") — they get real content in later phases.

Step 3: Define the Warm-White Liquid Glass Theme

Cuyamaca's design language is warm, natural, and precision-focused — inspired by Mt. Cuyamaca at sunset in fall. Warm golden grasslands, granite boulders, rose-violet clouds, deep slate-blue sky. Glass surfaces are warm white / cream, not dark. The richness comes from what bleeds through the translucent panels — a sunset gradient backing — not from the surfaces themselves.

This is NOT the same as Sierra's dark glass aesthetic. Cuyamaca uses the opposite pole: bleached granite catching late afternoon sun.

Create src/styles/globals.css with these CSS variables:

:root {
  /* background canvas */
  --bg-base: #FBF6EE;             /* warm parchment — the ground */
  --bg-gradient-amber: rgba(240, 184, 112, 0.50);
  --bg-gradient-violet: rgba(122, 122, 168, 0.30);
  --bg-gradient-rose: rgba(196, 116, 138, 0.15);

  /* glass hierarchy — warm white translucency */
  --glass-subtle-bg: rgba(252, 246, 238, 0.55);
  --glass-subtle-border: rgba(212, 180, 140, 0.30);
  --glass-subtle-blur: 16px;
  --glass-subtle-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 4px 16px rgba(120,100,60,0.06);

  --glass-standard-bg: rgba(252, 246, 238, 0.72);
  --glass-standard-border: rgba(212, 180, 140, 0.45);
  --glass-standard-blur: 24px;
  --glass-standard-shadow: 0 1px 0 rgba(255,255,255,0.8) inset, 0 4px 20px rgba(120,100,60,0.08);

  --glass-strong-bg: rgba(252, 246, 238, 0.88);
  --glass-strong-border: rgba(212, 180, 140, 0.60);
  --glass-strong-blur: 32px;
  --glass-strong-shadow: 0 1px 0 rgba(255,255,255,0.9) inset, 0 8px 32px rgba(120,100,60,0.12);

  /* palette — sunset over Mt. Cuyamaca */
  --amber-gold: #D4843A;          /* golden grassland */
  --amber-light: #F0B870;         /* lit grass highlights */
  --amber-glow: rgba(240, 184, 112, 0.35);  /* warm ambient fill */

  --rose-dust: #C4748A;           /* rose clouds */
  --rose-light: #E8A8B8;          /* lighter cloud edges */

  --violet-slate: #7A7AA8;        /* violet-blue sky band */
  --violet-deep: #4A4A78;         /* deep upper sky */

  --sky-blue: #8090B4;            /* evening sky blue */

  --granite-white: #F4F0EC;       /* boulder surface */
  --granite-warm: #E8E0D8;        /* boulder shadow side */

  --ridgeline: #3A3848;           /* dark silhouetted hills */
  --earth-brown: #8A6840;         /* soil / dark rock */

  /* accent tint backgrounds — layered on top of standard glass */
  --tint-amber-bg: rgba(240, 184, 112, 0.18);
  --tint-amber-border: rgba(212, 132, 58, 0.35);

  --tint-rose-bg: rgba(196, 116, 138, 0.14);
  --tint-rose-border: rgba(196, 116, 138, 0.30);

  --tint-violet-bg: rgba(122, 122, 168, 0.12);
  --tint-violet-border: rgba(122, 122, 168, 0.25);

  --tint-green-bg: rgba(93, 160, 120, 0.14);
  --tint-green-border: rgba(93, 160, 120, 0.30);
  --green: #5DA078;

  --tint-red-bg: rgba(180, 80, 70, 0.12);
  --tint-red-border: rgba(180, 80, 70, 0.28);
  --red: #B45046;

  /* text — warm on light glass */
  --text-primary: #2C2830;        /* near-black with violet undertone */
  --text-secondary: #7A6858;      /* warm brown-grey */
  --text-tertiary: #A89888;       /* muted warm grey */
  --text-accent: #8A6840;         /* earth brown — labels, section headers */
  --text-code: #4A4478;           /* violet-slate — monospace data */
  --text-sensor: #6A5020;         /* deep amber — live sensor readouts */

  /* typography */
  --font-mono: 'Triplicate T4c', 'Courier Prime', 'Courier New', monospace;
  --font-ui: 'Freight Text Pro', 'Palatino Linotype', Georgia, 'Times New Roman', serif;

  /* spacing */
  --sidebar-width: 220px;
  --parts-panel-width: 260px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-capsule: 24px;

  /* reduced transparency fallback */
  --solid-surface: #F5EFE8;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 13.5px;
  line-height: 1.55;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

Ambient Background

The gradient behind all glass panels is load-bearing — it is what the glass refracts. Without it, the warm-white panels look flat.

.app-background {
  position: fixed;
  inset: 0;
  background: var(--bg-base);
  background-image:
    radial-gradient(ellipse 80% 60% at 75% 15%, var(--bg-gradient-amber) 0%, transparent 60%),
    radial-gradient(ellipse 50% 70% at 15% 80%, var(--bg-gradient-violet) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 50% 50%, var(--bg-gradient-rose) 0%, transparent 50%);
  z-index: -1;
}

/* Extremely slow subliminal drift on the gradient orbs */
@media (prefers-reduced-motion: no-preference) {
  .app-background {
    animation: drift 18s ease-in-out infinite alternate;
  }

  @keyframes drift {
    0% { background-position: 0% 0%; }
    100% { background-position: 2% 3%; }
  }
}

Glass Utility Classes

.glass-subtle {
  backdrop-filter: blur(var(--glass-subtle-blur)) saturate(1.4);
  background: var(--glass-subtle-bg);
  border: 0.5px solid var(--glass-subtle-border);
  box-shadow: var(--glass-subtle-shadow);
}

.glass-standard {
  backdrop-filter: blur(var(--glass-standard-blur)) saturate(1.6);
  background: var(--glass-standard-bg);
  border: 0.5px solid var(--glass-standard-border);
  box-shadow: var(--glass-standard-shadow);
}

.glass-strong {
  backdrop-filter: blur(var(--glass-strong-blur)) saturate(1.8);
  background: var(--glass-strong-bg);
  border: 0.5px solid var(--glass-strong-border);
  box-shadow: var(--glass-strong-shadow);
}

/* Reduced transparency mode — solid warm surface, same layout */
@media (prefers-reduced-transparency: reduce) {
  .glass-subtle,
  .glass-standard,
  .glass-strong {
    backdrop-filter: none;
    background: var(--solid-surface);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  }
}

Typography Classes

.label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-accent);
}

.mono {
  font-family: var(--font-mono);
}

.text-secondary {
  color: var(--text-secondary);
  font-size: 12px;
}

.text-sensor {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text-sensor);
  font-size: 13px;
}

.text-code {
  font-family: var(--font-mono);
  color: var(--text-code);
  font-size: 13px;
}

Step 4: Build the Three-Panel Layout

The App.tsx renders the three-panel layout with CSS grid or flexbox:

┌──────────┬────────────────────────────┬─────────────────┐
│ Sidebar  │      Main Area             │  Parts Panel    │
│ (220px)  │      (flex: 1)             │  (260px)        │
└──────────┴────────────────────────────┴─────────────────┘

The sidebar is Glass Subtle. The parts panel is Glass Subtle and collapsible. The main area has no glass — it is the content canvas where the ambient background gradient shows through directly. Glass Standard and Glass Strong are used for content elements within the main area (cards, messages, code blocks).

App.tsx manages:

• Current active view (manifest / code / chat) — via React state
• Parts panel visibility — collapsible via state toggle
• View switching from sidebar navigation clicks

Sidebar Component

The sidebar contains:

Top section: App name "Cuyamaca" in label style, earth-brown text.

Navigation section: Three nav items — Manifest, Code, Chat. Each is a clickable row that highlights when active. Active state uses a left border accent in --amber-gold and slightly brighter text (--text-primary). Inactive items use --text-secondary.

Bottom section: Service health indicators, stacked vertically:

• Ollama — status dot + label
• arduino-cli — status dot + label
• Code Model — status dot + label (shows model name when configured)
• Runtime Model — status dot + label (shows model name when configured)

All dots default to red (not connected) for now. They get wired to real health checks in later phases.

StatusDot Component

A reusable 6px circle with a matching color glow and a subtle dark outline for visibility on the light background:

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  outline: 1px solid rgba(0, 0, 0, 0.08);
}

.status-dot.green {
  background: var(--green);
  box-shadow: 0 0 5px rgba(93, 160, 120, 0.6);
}

.status-dot.amber {
  background: var(--amber-gold);
  box-shadow: 0 0 5px rgba(212, 132, 58, 0.6);
}

.status-dot.red {
  background: var(--red);
  box-shadow: 0 0 5px rgba(180, 80, 70, 0.6);
}

Parts Panel

Placeholder for now. Shows a "Components" header (label style, --text-accent earth-brown) and a message like "no project loaded" in --text-secondary. This gets real content in Phase 3 (project system + manifest editor). The panel is collapsible — a toggle button in the titlebar area hides/shows it.

Responsive Behavior

• ≥1100px: Full three-panel layout
• 900–1099px: Parts panel collapses to an icon-toggle in the titlebar
• <900px: Sidebar collapses to icons only (no labels), parts panel hidden

Step 5: Create the IPC Verification Command

This is the smoke test that proves the Tauri IPC bridge works.

Rust side (src-tauri/src/commands/debug.rs)

#[tauri::command]
pub fn ping(message: String) -> Result<String, String> {
    Ok(format!("pong: {}", message))
}

Register it in lib.rs: