css

/* Interactive pseudo-classes */
a:link { color: blue; }
a:visited { color: purple; }
a:hover { text-decoration: underline; }
a:active { color: red; }
a:focus { outline: 2px solid orange; }

import { useEffect, useRef, useState } from "react";

export type AsyncState<T> =
  | { status: "loading" }
  | { status: "error"; error: Error }
  | { status: "success"; data: T };

web: bin/rails server
css: bin/rails tailwindcss:watch

// Theme switching with CSS variables
const themeToggle = document.getElementById('theme-toggle');
const root = document.documentElement;

// Load saved theme
const savedTheme = localStorage.getItem('theme') || 'light';

import { useEffect, RefObject } from "react";

const TABBABLE =
  'a[href],button:not([disabled]),textarea:not([disabled]),input:not([disabled]),select:not([disabled]),[tabindex]:not([tabindex="-1"])';

export function useFocusTrap(

.turbo-progress-bar {
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--progress-start, #6366f1),
    var(--progress-end, #ec4899)

import { useCallback, useEffect, useRef, useState } from 'react';

export type CopyStatus = 'idle' | 'copied' | 'error';

function fallbackCopy(text: string): boolean {
  const textarea = document.createElement('textarea');

/* Basic flexbox container */
.flex-container {
  display: flex;
  /* flex-direction: row | row-reverse | column | column-reverse */
  flex-direction: row; /* default */

/* Basic transitions */
.button {
  background-color: blue;
  color: white;
  padding: 1rem 2rem;
  transition: background-color 0.3s ease;

/* Container Queries */
.card-container {
  container-type: inline-size; /* Creates query container */
  container-name: card;
}

import { useEffect, useRef } from "react";

const FOCUSABLE = [
  "a[href]",
  "button:not([disabled])",
  "textarea:not([disabled])",

.confirm-dialog {
  border: none;
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 26rem;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);