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CoolNight Collection

The CoolNight Collection is a set of 21 parametrically generated themes designed for extended development sessions. All variants share consistent color relationships derived from the CoolNight Ocean base theme using HSL hue rotation.

Overview

CoolNight themes are standalone - they require no external Neovim plugin. Highlight groups are applied directly via Lua without a colorscheme plugin dependency.

Design goals:

  • Reduced eye strain - Calibrated contrast ratios for long sessions
  • Consistent syntax highlighting - The same color semantics across all 21 variants
  • Parametric generation - All variants are mathematically derived from the Ocean base
  • Semantic color stability - Error (red), warning (yellow), and cursor colors are fixed across all variants

Color Science

HSL Color Space

CoolNight uses HSL (Hue, Saturation, Lightness) for color generation:

  • Hue - A value from 0-360 degrees that determines the dominant color family
  • Saturation - Fixed at calibrated levels (40-70%) to ensure vibrancy without oversaturation
  • Lightness - Fixed per semantic role to maintain consistent contrast ratios

The parametric generator rotates all non-semantic colors to a new hue while preserving their saturation and lightness relationships from the Ocean base palette.

Accessibility

CoolNight themes maintain WCAG AA contrast ratios (4.5:1 minimum) between foreground text and background colors. Semantic colors (errors, warnings) are never rotated - they retain the original red, green, and yellow values regardless of theme hue.

Complete Collection

Blue Family

Theme Hue Character Best For
coolnight-arctic 200° Ice blue, crisp and clean TypeScript, Go, documentation
coolnight-ocean 210° Deep blue, the default General development, Python
coolnight-midnight 230° Dark blue, intense focus Late-night coding, C++ 
nvp theme use coolnight-arctic
nvp theme use coolnight-ocean
nvp theme use coolnight-midnight

Purple Family

Theme Hue Character Best For
coolnight-violet 280° Soft violet, gentle on eyes Web development, CSS
coolnight-synthwave 270° Neon purple, retro vibes JavaScript, creative coding
coolnight-grape 290° Rich grape, sophisticated Rust, systems programming 
nvp theme use coolnight-violet
nvp theme use coolnight-synthwave
nvp theme use coolnight-grape

Green Family

Theme Hue Character Best For
coolnight-forest 140° Deep forest green, earthy Bash scripts, DevOps
coolnight-matrix 150° Digital green, high contrast Terminal work, security
coolnight-mint 165° Fresh mint, modern feel React, Vue.js 
nvp theme use coolnight-forest
nvp theme use coolnight-matrix
nvp theme use coolnight-mint

Warm Family

Theme Hue Character Best For
coolnight-ember 15° Glowing ember, energetic Java, Spring Boot
coolnight-sunset 25° Warm orange, inviting HTML, markup languages
coolnight-gold 45° Golden yellow, premium Configuration files, YAML 
nvp theme use coolnight-ember
nvp theme use coolnight-sunset
nvp theme use coolnight-gold

Red/Pink Family

Theme Hue Character Best For
coolnight-crimson 0° Deep crimson, bold Error handling, debugging
coolnight-sakura 330° Cherry blossom, elegant Design systems
coolnight-rose 350° Rose pink, warm Personal projects 
nvp theme use coolnight-crimson
nvp theme use coolnight-sakura
nvp theme use coolnight-rose

Monochrome Family

Monochrome variants apply desaturation after hue generation, producing gray-scale or near-gray themes with minimal color distraction.

Theme Saturation Character Best For
coolnight-mono-charcoal 0% Pure grayscale Distraction-free coding
coolnight-mono-slate 15% Subtle blue-gray Enterprise development
coolnight-mono-warm 15% Subtle warm-gray Long coding sessions 
nvp theme use coolnight-mono-charcoal
nvp theme use coolnight-mono-slate
nvp theme use coolnight-mono-warm

Semantic colors in monochrome themes

Error, warning, and cursor colors retain their original saturated values even in monochrome variants. This preserves the visual distinction for diagnostics.

Special Variants

Variants inspired by well-known themes, adapted to the CoolNight parametric system.

Theme Inspiration Character Best For
coolnight-nord Nord theme Arctic blue-gray, clean Nordic aesthetic
coolnight-dracula Dracula theme Rich purple, dark gothic High-contrast dark work
coolnight-solarized Solarized theme Blue-cyan, precise Academic, research 
nvp theme use coolnight-nord
nvp theme use coolnight-dracula
nvp theme use coolnight-solarized

Usage Recommendations

By Development Environment

Terminal-heavy workflows:

  • coolnight-matrix - High contrast green
  • coolnight-mono-charcoal - Minimal, no distractions

Web development:

  • coolnight-mint - Modern, fresh
  • coolnight-synthwave - Creative, vibrant

Systems programming:

  • coolnight-midnight - Deep focus
  • coolnight-grape - Sophisticated

Documentation writing:

  • coolnight-arctic - Clean and readable
  • coolnight-mono-warm - Easy on eyes for long reading

Presentations and screen sharing:

  • coolnight-ocean - Professional default
  • coolnight-sunset - Warm, welcoming

By Time of Day

Morning:

  • coolnight-arctic - Fresh and energizing
  • coolnight-mint - Bright start

Daytime:

  • coolnight-ocean - Balanced and professional
  • coolnight-forest - Natural and comfortable

Evening:

  • coolnight-sunset - Warm transition
  • coolnight-ember - Cozy

Late night:

  • coolnight-midnight - Deep focus
  • coolnight-mono-slate - Reduced stimulation

Integration with Theme Hierarchy

CoolNight variants work well with dvm's hierarchical theme system:

# Set a professional default at ecosystem level
dvm set theme coolnight-ocean --ecosystem corporate

# Use high contrast for security work at domain level
dvm set theme coolnight-matrix --domain security

# Set a creative theme for a specific app
dvm set theme coolnight-synthwave --app creative-tool

# Override for your personal workspace
dvm set theme coolnight-midnight --workspace my-dev

See Theme Hierarchy for the full cascade model.

Troubleshooting

Theme Not Applying

# Check if the theme is available
nvp theme list | grep coolnight

# View theme details
nvp theme get coolnight-ocean -o yaml

# Regenerate Lua files
nvp generate

Colors Look Wrong in Neovim

# Confirm true color support
echo $COLORTERM
# Expected: truecolor

# Check Neovim termguicolors
nvim -c 'set termguicolors?' -c 'q'

Custom Variant Issues

# Review the generated theme
nvp theme get my-custom-theme -o yaml

# Regenerate after any changes
nvp generate

Next Steps