StringTune design system

---
version: alpha
name: StringTune
description: "Dark interface measured from string-tune.fiddle.digital: KHTeka type with Manrope, vivid red accents, flat surfaces and 20px corners."
colors:
  background: "#101214"
  surface: "#101214"
  on-surface: "#FFFFFF"
  on-background: "#FFFFFF"
  on-surface-variant: "#E6DFE4"
  on-surface-muted: "#A399A8"
  on-surface-subtle: "#544D56"
  overlay: "#A7A7B415"
  overlay-strong: "#E6DFE466"
  primary: "#FF4F36"
  on-primary: "#101214"
typography:
  headline-display:
    fontFamily: KHTeka
    fontSize: 253.5px
    fontWeight: 400
    lineHeight: 0.75
    letterSpacing: -0.06em
  headline-lg:
    fontFamily: KHTeka
    fontSize: 84px
    fontWeight: 400
    lineHeight: 0.79
    letterSpacing: -0.02em
  headline-md:
    fontFamily: KHTeka
    fontSize: 27px
    fontWeight: 400
    lineHeight: 1.08
    letterSpacing: -0.02em
  headline-sm:
    fontFamily: KHTeka
    fontSize: 20px
    fontWeight: 400
    lineHeight: 1.2
  body-md:
    fontFamily: KHTeka
    fontSize: 15px
    fontWeight: 400
    lineHeight: 1.2
  label-md:
    fontFamily: Manrope
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.4
  code:
    fontFamily: KHTekaMono
    fontSize: 11px
    fontWeight: 400
    lineHeight: 1.2
  headline-display-mobile:
    fontFamily: KHTeka
    fontSize: 123px
    fontWeight: 400
    lineHeight: 0.87
    letterSpacing: -0.06em
  headline-lg-mobile:
    fontFamily: KHTeka
    fontSize: 44px
    fontWeight: 400
    lineHeight: 0.9
    letterSpacing: -0.02em
rounded:
  sm: 15px
  md: 20px
  lg: 26.66px
  full: 9999px
spacing:
  xs: 4px
  sm: 8px
  md: 16px
  lg: 20px
  xl: 63.15px
  gutter: 8px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-primary}"
    typography: "{typography.headline-sm}"
    rounded: 9px
    padding: 0px
    height: 32px
  button-ghost:
    textColor: "{colors.on-primary}"
    typography: "{typography.headline-sm}"
    rounded: "{rounded.md}"
    padding: 4px 16px
  card:
    backgroundColor: "{colors.on-surface}"
    textColor: "{colors.on-primary}"
    typography: "{typography.headline-sm}"
    rounded: "{rounded.md}"
    padding: 16px 24px 32px 24px
---

# StringTune Design System

## Overview

StringTune describes itself as: “StringTune is a cutting-edge JavaScript library designed to deliver high-performance, modular web effects. Whether you're looking to add smooth parallax scrolling, dynamic cursor interactions, progress tracking, or autop” The interface is dark, built on **Charcoal (#101214)** with **White (#FFFFFF)** text, and **Vivid Red (#FF4F36)** as the main accent.

Type is set in **KHTeka** and **Manrope**, with **KHTekaMono** for code. Headlines run large with tight negative tracking; body text is 15px. The surface language is flat. Corners are mostly 20px.

Measured from [string-tune.fiddle.digital](https://string-tune.fiddle.digital/) on November 4, 2026 at 1440×900 and 390×844 from 167 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 9 roles.

- **Charcoal (#101214):** Page background, seen 2 times. Token `background`, CSS `--c-black`.
- **White (#FFFFFF):** Primary text and headings, seen 7 times. Token `on-surface`, CSS `--c-white`.
- **Mist (#E6DFE4):** Secondary text, seen 6 times. Token `on-surface-variant`, CSS `--c-grey`.
- **Cool Gray (#A399A8):** Muted text and metadata, seen 8 times. Token `on-surface-muted`, CSS `--c-purple`.
- **Cool Slate (#544D56):** Subtle text and placeholders, seen 3 times. Token `on-surface-subtle`.
- **Cool Gray 8% (#A7A7B415):** Translucent fill for cards and controls, seen 1 time. Token `overlay`.
- **Mist 40% (#E6DFE466):** Stronger translucent fill, seen 1 time. Token `overlay-strong`.
- **Vivid Red (#FF4F36):** Primary buttons and calls to action, seen 8 times. Token `primary`, CSS `--c-red`.
- **Charcoal (#101214):** Text and icons on primary. Token `on-primary`.

## Typography

**KHTeka**, **Manrope** and **KHTekaMono** (monospace) share the interface. Fallback stack: `KHTeka, system-ui, -apple-system, BlinkMacSystemFont`.

- **headline-display:** KHTeka 253.5px at weight 400, line height 0.75, tracking -0.06em (123px on mobile). Page title (h1).
- **headline-lg:** KHTeka 84px at weight 400, line height 0.79, tracking -0.02em (44px on mobile). Section headings (h2).
- **headline-md:** KHTeka 27px at weight 400, line height 1.08, tracking -0.02em. Sub-section headings.
- **headline-sm:** KHTeka 20px at weight 400, line height 1.2. Card and feature titles.
- **body-md:** KHTeka 15px at weight 400, line height 1.2. Body text.
- **label-md:** Manrope 14px at weight 400, line height 1.4. Buttons, navigation and labels.
- **code:** KHTekaMono 11px at weight 400, line height 1.2. Code and technical values.

## Layout

Spacing does not follow a strict grid: 69% of measured values are multiples of 4px, so match the measured steps rather than rounding to a grid.

- **Scale:** xs 4px, sm 8px, md 16px, lg 20px, xl 63.15px.
- **Gaps:** 8px is the most common gap in flex and grid layouts.
- **Breakpoints:** 1024px, 1440px, 1600px, 1920px, 2560px.

## Elevation & Depth

The design is flat: no shadows were measured. Hierarchy comes from color contrast.

## Shapes

Most elements use 20px corners. Measured radii, most used first:

- **md (20px):** 40 elements.
- **sm (15px):** 16 elements.
- **lg (26.66px):** 4 elements.
- **full (9999px):** 4 elements.

## Components

Measured from the rendered page. Token values reference the tokens above.

- **button-primary (“StringTune”):** #FF4F36 fill, #101214 text, 20px/400, 9.0045px radius, padding 0px.
- **button-ghost (“Learn How”):** transparent fill, #101214 text, 20px/400, 20px radius, padding 4px 16px.
- **card:** #FFFFFF fill, #101214 text, 20px/400, 20px radius, padding 16px 24px 32px 24px.

## Do's and Don'ts

- Do use #101214 for the page.
- Do keep text in 4 levels: #FFFFFF, #E6DFE4, #A399A8, #544D56.
- Do reserve #FF4F36 for primary actions and key highlights.
- Do set headlines in KHTeka with tight tracking (-0.06em).
- Do reuse the measured spacing steps (8px, 16px, 20px).
- Do use 20px corners on most elements; larger surfaces also use 15px and 26.66px.
- Don't use #544D56 for body text; it reaches 2.30:1 on #101214. Keep it for large text or metadata.
- Don't add drop shadows for depth; use borders and contrast.
- Don't introduce new font families beyond KHTeka, Manrope and KHTekaMono.
- Don't use #FF4F36 for large backgrounds or body text.
- Don't make interface transitions slower than 0.6s.

## Motion

Interface transitions are quick: 0.3s, 0.45s, 0.6s. Longer ambient animations run 0.9s, 1.5s, 6s.

- **Easing:** `cubic-bezier(0.35, 0.35, 0, 1)`, `cubic-bezier(0.6, 0.5, 0, 3)`, `cubic-bezier(0.5, 0, 0.3, 1)`.

Generated by [Sitepeel](https://sitepeel.dev/design-md/string-tune.fiddle.digital/), the free DESIGN.md generator (engine 2026.10.29+b828a475ee10).