Grainient Effects Skill

Recreate the visual vocabulary of grainient.supply — 16 composable dark-mode effects spanning WebGL shaders, CSS surfaces, JS-driven motion, and layout patterns. No Framer dependency. Single-file HTML output.

Quick Start

# Generate a hero section with aurora shader
python3 scripts/grainient_generator.py --mode hero --output hero.html

# Generate a full landing page
python3 scripts/grainient_generator.py --mode page --output landing.html

# Custom accent color
python3 scripts/grainient_generator.py --mode bento --accent "#FF6B35" --output showcase.html

# Interactive effects catalog
python3 scripts/grainient_generator.py --mode catalog --output catalog.html

Or let Claude generate directly from the templates and references.

Effects Catalog

Modes

Color System

All effects read from --grn-* CSS custom properties. Override at :root to re-theme:

:root {
  /* Background scale (dark-on-dark elevation) */
  --grn-bg: #000000;
  --grn-surface: #141414;
  --grn-elevated: #1A1A1A;
  --grn-card: #2B2B2B;

  /* Accent */
  --grn-accent: #C2F13C;
  --grn-accent-40: rgba(194, 241, 60, 0.4);
  --grn-accent-20: rgba(194, 241, 60, 0.2);

  /* Text */
  --grn-text: #FFFFFF;
  --grn-text-70: rgba(255, 255, 255, 0.7);
  --grn-text-40: rgba(255, 255, 255, 0.4);
  --grn-text-20: rgba(255, 255, 255, 0.2);
  --grn-text-10: rgba(255, 255, 255, 0.1);

  /* Borders */
  --grn-border: rgba(255, 255, 255, 0.2);
  --grn-border-subtle: rgba(255, 255, 255, 0.1);

  /* Motion */
  --grn-spring-snappy: cubic-bezier(0.34, 1.56, 0.64, 1);
  --grn-spring-smooth: cubic-bezier(0.25, 1, 0.5, 1);
  --grn-spring-subtle: cubic-bezier(0.22, 1, 0.36, 1);

  /* Blur tiers */
  --grn-blur-light: blur(5px);
  --grn-blur-medium: blur(10px);
  --grn-blur-heavy: blur(20px);

  /* Typography */
  --grn-font: 'Inter', system-ui, sans-serif;
  --grn-hero-size: clamp(32px, 4vw + 1rem, 6vw);
  --grn-body-size: clamp(16px, 1vw + 1rem, 1.1vw);
}

Font: Inter at weights 400, 500, 600. Always set -webkit-font-smoothing: antialiased.

Palette Presets

Default (Lime): --grn-accent: #C2F13C — the canonical grainient.supply lime green.

Glass Hero (Mint/Violet): Override :root with the glass-hero palette for kaolti's dark glass aesthetic — mint green #57FFA8 accent, violet #A78BFA secondary, blue-tinted near-black #0a0a0c base. Includes Geist typography tokens and glass-edge border values. See references/glass-hero-palette.md for the full token block, typography scale, glassmorphism recipes, and differences from default grainient.

/* Quick swap — glass-hero palette */
:root {
  --grn-bg: #0a0a0c;
  --grn-accent: #57FFA8;
  --grn-accent-40: rgba(87, 255, 168, 0.4);
  --grn-accent-20: rgba(87, 255, 168, 0.2);
  --grn-border: rgba(255, 255, 255, 0.11);
}

For the full 3D glass experience with MeshPhysicalMaterial refraction/dispersion/iridescence, use threejs-particle-canvas Mode 6 (glass-hero).

Layer Stack (Composability)

Every grainient page is a z-index stack of 6 layers:

Layer 0  z-index: 0    Body background (#000)
Layer 1  z-index: 1    Shader gradient canvas (position: fixed)
Layer 2  z-index: 2    Vignette overlay (position: fixed, pointer-events: none)
Layer 3  z-index: 3    Grid pattern overlay (position: fixed, pointer-events: none)
Layer 4  z-index: 10   Content sections (position: relative)
Layer 5  z-index: 100  Glassmorphism nav / floating UI (position: fixed)

Effects slot into layers. Content sections use surface colors (--grn-surface, --grn-elevated) for dark-on-dark elevation contrast.

See references/composability.md for composition recipes and performance budget.

Implementation Rules

1. Vanilla only. No React, Vue, Svelte, Angular. Plain HTML + CSS + JS.
2. Single-file output. Everything in one HTML file. CDN imports for Inter font only.
3. Dark-mode-first. Body is #000. Surfaces elevate via #141414 → #1A1A1A → #2B2B2B.
4. --grn-* tokens everywhere. Never hardcode colors — always reference custom properties.
5. prefers-reduced-motion required. Every animated effect needs a reduced-motion fallback.
6. DPR clamp at 1.5 for WebGL canvas. Full DPR for CSS.
7. requestAnimationFrame only. Never setInterval for animation.
8. overflow: clip over overflow: hidden on individual containers, never on body.
9. Inter font, antialiased. Default font for all modes. Palette presets (e.g., glass-hero) may override --grn-font — see Palette Presets section.

Anti-Patterns

• Never use ease timing function — use --grn-spring-* cubic-bezier tokens
• Never use box-shadow with fewer than 4 layers — grainient shadows are deep stacks
• Never use border for the inset border system — use box-shadow: inset 0 0 0 1px or per-side gradients
• Never use backdrop-filter without a semi-transparent background — blur on opaque dark is invisible
• Never use scroll-behavior: smooth as a substitute for Lenis-style scroll — no inertia, no lerp control
• Never omit the vignette when using a shader background — content bleeds into shader without it
• Never hardcode pixel values for typography — always clamp() with viewport-relative middle
• Never use opacity: 0 for hover-zoom initial state without pointer-events: none
• Never set all ticker columns to the same speed — vary by 10-30% per column
• Never use perspective() without overflow: visible on the container — clips 3D rotation
• Never use pure white (#FFF) as background anywhere — this is a dark-mode skill
• Never use Three.js for the fullscreen gradient — raw WebGL2 suffices; see rocaille-shader for Three.js needs

See references/anti-patterns.md for expanded explanations with code examples.

Generator Script

python3 scripts/grainient_generator.py \
  --mode hero|bento|ticker|page|catalog \
  --accent "#C2F13C" \
  --bg "#000000" \
  --surface "#141414" \
  --output output.html

Validation