Philosophy

This design system is built on three principles: clarity, restraint, and craft. We use a monolithic CSS file, the Lato sans-serif typeface, and a strict black-and-white palette. Shadows are soft and plush. Animations are subtle. Everything feels tactile and considered.

We don't chase trends. We build things that feel good to use and age gracefully.

Typography

Heading 1 - Lato

Heading 2 - Lato

Heading 3 - Lato

Body text uses Lato sans-serif at 1rem with 1.6 line height for comfortable reading.

Small text at 0.875rem for secondary information.

Colors

Base Colors

Background#ffffff

Secondary#f8f8f8

Foreground#000000

Secondary Text#666666

Tertiary Text#999999

Border#e5e5e5

Semantic Colors

Success#10a37f

Warning#f59e0b

Error#ef4444

Buttons

Cards

MAU1,234

Revenue$5,678

Links

Soft Link•Another Link

Spacing

xs - 8px

sm - 16px

md - 24px

lg - 32px

xl - 48px

2xl - 64px

Shadows

Soft, layered shadows create depth without aggression. Multiple shadow layers at low opacity create a plush, tactile feeling.

Card Shadow

Hover Shadow

Button Shadow

Border Radius

4px

8px

12px

20px

pill

Progress Bar

Table

App Name	MAU	Revenue	Status
Convo	1,234	$5,678	Live
Tale	2,345	$6,789	Beta
Grasp	3,456	$7,890	Coming Soon

Badges

DefaultSuccessWarningError

Input Fields

Divider

Content above divider

Content below divider

Code Block

import Image from "next/image";

export default function Home() {
  const apps = [
    {
      id: 1,
      name: "Convo",
      slug: "convo",
      description: "Chat with multiple AI models.",
      mau: "0",
      revenue: "$0.00",
      icon: "/convo-logo.png",
      link: null,
    },
  ];

  return (
    <div className="page-container">
      <header className="header">
        <h1>by John Leonardo</h1>
      </header>
    </div>
  );
}

Theme Switcher

The theme system supports both light and dark modes with seamless transitions. The switcher is positioned in the top-right corner and respects user preferences through localStorage and system color scheme detection.

How It Works

CSS Variables: All colors are defined as CSS custom properties that automatically update when the theme changes via a data-theme attribute on the root element.
Theme Context: A React context provider manages theme state and provides a toggle function to all components.
Persistence: The selected theme is saved to localStorage and restored on subsequent visits.
System Detection: If no theme is saved, the system automatically detects and applies the user's OS color scheme preference.
Hydration Safe: The component uses a "mounted" state to prevent hydration mismatches between server and client rendering.

Component Example

"use client";

import { useTheme } from "./theme-provider";
import { useEffect, useState } from "react";

export function ThemeSwitcher() {
  const { theme, toggleTheme } = useTheme();
  const [mounted, setMounted] = useState(false);

  useEffect(() => {
    setMounted(true);
  }, []);

  if (!mounted) {
    return null;
  }

  return (
    <button
      onClick={toggleTheme}
      className="theme-switcher"
      aria-label={`Switch to ${theme === "light" ? "dark" : "light"} mode`}
    >
      {theme === "light" ? (
        <svg
          width="20"
          height="20"
          viewBox="0 0 20 20"
          fill="none"
          xmlns="http://www.w3.org/2000/svg"
        >
          <path
            d="M10 3V1M10 19V17M17 10H19M1 10H3M15.657 4.343L17.071 2.929M2.929 17.071L4.343 15.657M15.657 15.657L17.071 17.071M2.929 2.929L4.343 4.343M14 10C14 12.2091 12.2091 14 10 14C7.79086 14 6 12.2091 6 10C6 7.79086 7.79086 6 10 6C12.2091 6 14 7.79086 14 10Z"
            stroke="currentColor"
            strokeWidth="2"
            strokeLinecap="round"
            strokeLinejoin="round"
          />
        </svg>
      ) : (
        <svg
          width="20"
          height="20"
          viewBox="0 0 20 20"
          fill="none"
          xmlns="http://www.w3.org/2000/svg"
        >
          <path
            d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z"
            stroke="currentColor"
            strokeWidth="2"
            strokeLinecap="round"
            strokeLinejoin="round"
          />
        </svg>
      )}
    </button>
  );
}

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Design System