Zendesk Garden-Designsystem.

import React, { useState, useRef } from "react";
import { createRoot } from "react-dom/client";
import { ThemeProvider, DEFAULT_THEME } from "@zendeskgarden/react-theming";
import { Button } from "@zendeskgarden/react-buttons";
import {
  Field,
  Label,
  Textarea,
  Hint,
  Message,
  Select,
} from "@zendeskgarden/react-forms";
import "./garden.css";
function App() {
  const [mode, setMode] = useState("public"),
    [text, setText] = useState(""),
    [error, setError] = useState(false),
    [items, setItems] = useState([]);
  const ref = useRef();
  function submit(e) {
    e.preventDefault();
    if (text.trim().length < 12) {
      setError(true);
      ref.current.focus();
      return;
    }
    setItems([...items, { mode, text: text.trim() }]);
    setText("");
    setError(false);
  }
  return (
    <ThemeProvider theme={DEFAULT_THEME}>
      <main className="garden-workspace">
        <header>
          <span>SUPPORT WORKSPACE / FICTIONAL TICKET</span>
          <h1>Help with an invoice address</h1>
          <p>Ticket #1028 · Nadia Walker · Email channel</p>
        </header>
        <div className="garden-grid">
          <section>
            <div className="message customer">
              <strong>Nadia Walker</strong>
              <small>Customer · example message</small>
              <p>
                Could you update the company address on our next invoice? The
                billing contact has changed.
              </p>
            </div>
            {items.map((i, n) => (
              <article className={"message " + i.mode} key={n}>
                <strong>
                  {i.mode === "public"
                    ? "Public reply draft"
                    : "Internal note draft"}
                </strong>
                <small>Saved locally · not sent</small>
                <p>{i.text}</p>
              </article>
            ))}
            <form onSubmit={submit} noValidate>
              <div className="composer-head">
                <h2>Compose a draft</h2>
                <Field>
                  <Label>Visibility</Label>
                  <Select
                    value={mode}
                    onChange={(e) => setMode(e.target.value)}
                  >
                    <option value="public">Public reply</option>
                    <option value="internal">Internal note</option>
                  </Select>
                </Field>
              </div>
              <Field>
                <Label>
                  {mode === "public" ? "Reply text" : "Internal note"}
                </Label>
                <Hint>
                  {mode === "public"
                    ? "Prepared for the customer; this demo will not send it."
                    : "Internal context for the support team; saved only in this page."}
                </Hint>
                <Textarea
                  ref={ref}
                  value={text}
                  rows={5}
                  validation={error ? "error" : undefined}
                  onChange={(e) => {
                    setText(e.target.value);
                    setError(false);
                  }}
                />
                {error && (
                  <Message validation="error">
                    Write at least 12 characters.
                  </Message>
                )}
              </Field>
              <div className="composer-actions">
                <span>{text.length} characters</span>
                <Button
                  type="button"
                  onClick={() => {
                    setText("");
                    setError(false);
                    ref.current.focus();
                  }}
                >
                  Clear draft
                </Button>
                <Button isPrimary type="submit">
                  Save local draft
                </Button>
              </div>
            </form>
            <p role="status">
              {items.length > 0
                ? `${items.length} draft${items.length === 1 ? "" : "s"} saved locally. No message sent.`
                : ""}
            </p>
          </section>
          <aside>
            <h2>Ticket context</h2>
            <dl>
              <dt>Requester</dt>
              <dd>Nadia Walker</dd>
              <dt>Organization</dt>
              <dd>Northstar Studio</dd>
              <dt>Priority</dt>
              <dd>Normal</dd>
              <dt>Topic</dt>
              <dd>Billing details</dd>
            </dl>
            <div className="context-note">
              <h3>Before replying</h3>
              <ul>
                <li>Confirm the billing contact.</li>
                <li>Keep invoice identifiers out of public examples.</li>
                <li>State whether the change affects future invoices.</li>
              </ul>
            </div>
          </aside>
        </div>
        <footer>
          Native Garden 9.16.1 React components. Original local drafting
          workflow; no Zendesk connection.
        </footer>
      </main>
    </ThemeProvider>
  );
}
createRoot(document.getElementById("root")).render(<App />);

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font:
    14px/1.5 system-ui,
    sans-serif;
  color: #293239;
  background: #f8f9f9;
}
.garden-workspace header {
  padding: 24px 32px;
  background: white;
  border-bottom: 1px solid #d8dcde;
}
.garden-workspace header span {
  font-size: 10px;
  letter-spacing: 0.08em;
  color: #5c6970;
}
.garden-workspace h1 {
  font-size: 26px;
  line-height: 1.3;
  margin: 8px 0;
}
.garden-workspace header p {
  color: #5c6970;
  margin: 0;
}
.garden-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  padding: 24px 32px;
}
.message {
  padding: 20px;
  background: white;
  border: 1px solid #d8dcde;
  border-radius: 4px;
  margin-bottom: 16px;
}
.message p {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 12px 0 0;
}
.message small {
  display: block;
  color: #5c6970;
  margin-top: 4px;
}
.message.internal {
  background: #fff8ed;
  border-color: #e7ce99;
}
form {
  padding: 24px;
  background: white;
  border: 1px solid #d8dcde;
  border-radius: 4px;
}
.composer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}
.composer-head > div {
  max-width: 220px;
}
.garden-workspace h2 {
  font-size: 18px;
  margin: 0 0 12px;
}
.composer-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}
.composer-actions span {
  font-size: 12px;
  color: #5c6970;
  margin-right: auto;
}
.garden-grid aside {
  background: white;
  border: 1px solid #d8dcde;
  border-radius: 4px;
  padding: 20px;
  align-self: start;
}
dl {
  margin: 0;
}
dt {
  font-size: 12px;
  color: #5c6970;
  margin-top: 16px;
}
dd {
  margin: 4px 0 0;
  font-weight: 600;
}
.context-note {
  margin-top: 24px;
  border-top: 1px solid #e8eaec;
  padding-top: 16px;
}
.context-note h3 {
  font-size: 14px;
}
.context-note ul {
  padding-left: 18px;
  font-size: 12px;
}
.context-note li {
  margin: 8px 0;
}
footer {
  padding: 16px 32px;
  font-size: 12px;
  color: #5c6970;
  border-top: 1px solid #d8dcde;
  background: white;
}
@media (max-width: 850px) {
  .garden-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 550px) {
  .garden-grid {
    padding: 16px;
  }
  .garden-workspace header {
    padding: 20px 16px;
  }
  .composer-head {
    display: block;
  }
  .composer-head > div {
    max-width: none;
  }
  .composer-actions {
    flex-wrap: wrap;
    justify-content: flex-start;
  }
  .composer-actions span {
    width: 100%;
  }
  form {
    padding: 16px;
  }
}