Sistema di design Segment Evergreen.

import React, { useState } from "react";
import { createRoot } from "react-dom/client";
import {
  ThemeProvider,
  defaultTheme,
  Heading,
  Text,
  Paragraph,
  Button,
  TagInput,
  TextInputField,
  SelectField,
  Alert,
  Dialog,
  Badge,
  majorScale,
} from "evergreen-ui";
import "./evergreen.css";
const people = [
  { name: "Avery Stone", plan: "Pro", tags: ["active", "newsletter"] },
  { name: "Taylor Reed", plan: "Free", tags: ["newsletter"] },
  { name: "Jordan Park", plan: "Pro", tags: ["active"] },
  { name: "Morgan Lee", plan: "Team", tags: ["active", "newsletter"] },
  { name: "Casey Chen", plan: "Free", tags: ["trial"] },
];
function App() {
  const [tags, setTags] = useState(["active"]),
    [plan, setPlan] = useState("Any"),
    [name, setName] = useState("Active customers"),
    [error, setError] = useState(""),
    [open, setOpen] = useState(false),
    [saved, setSaved] = useState(null);
  const matches = people.filter(
    (p) =>
      (plan === "Any" || p.plan === plan) &&
      tags.every((t) => p.tags.includes(t)),
  );
  function changeTags(values) {
    const unique = [
      ...new Set(values.map((v) => v.trim().toLowerCase()).filter(Boolean)),
    ];
    if (unique.length > 4) {
      setError("Use at most four tags.");
      return false;
    }
    setTags(unique);
    setError("");
    setSaved(null);
  }
  return (
    <ThemeProvider value={defaultTheme}>
      <main className="audience">
        <header>
          <Text size={300}>WORKSPACE / AUDIENCES</Text>
          <Heading size={700} marginTop={8}>
            Build a focused audience
          </Heading>
          <Paragraph marginTop={8}>
            Combine a plan and tags against five fictional records. No customer
            data is loaded.
          </Paragraph>
        </header>
        <div className="audience-grid">
          <section className="rule-panel">
            <Heading size={500} marginBottom={majorScale(3)}>
              Audience rules
            </Heading>
            <TextInputField
              label="Audience name"
              value={name}
              onChange={(e) => {
                setName(e.target.value);
                setSaved(null);
              }}
            />
            <SelectField
              label="Plan"
              value={plan}
              onChange={(e) => {
                setPlan(e.target.value);
                setSaved(null);
              }}
            >
              <option>Any</option>
              <option>Free</option>
              <option>Pro</option>
              <option>Team</option>
            </SelectField>
            <label htmlFor="audience-tags">Required tags</label>
            <Paragraph size={300} marginBottom={8}>
              Press Enter or comma to add a tag. Every tag must match.
            </Paragraph>
            <TagInput
              values={tags}
              onChange={changeTags}
              width="100%"
              inputProps={{ id: "audience-tags", placeholder: "Add tag…" }}
            />
            <Paragraph size={300} marginTop={8}>
              Available sample tags: active, newsletter, trial.
            </Paragraph>
            {error && <Alert intent="danger" title={error} marginTop={16} />}
            <Button
              appearance="primary"
              marginTop={24}
              onClick={() => {
                if (!name.trim()) {
                  setError("Name the audience before reviewing.");
                  return;
                }
                setError("");
                setOpen(true);
              }}
            >
              Review audience
            </Button>
          </section>
          <section className="results-panel">
            <div className="results-title">
              <Heading size={500}>Matching sample records</Heading>
              <Badge color="blue">
                {matches.length} of {people.length}
              </Badge>
            </div>
            {matches.length ? (
              <div className="record-list">
                {matches.map((p) => (
                  <article key={p.name}>
                    <div>
                      <Heading size={400}>{p.name}</Heading>
                      <Text size={300}>{p.plan} plan</Text>
                    </div>
                    <div className="tag-list">
                      {p.tags.map((t) => (
                        <Badge key={t} color="neutral">
                          {t}
                        </Badge>
                      ))}
                    </div>
                  </article>
                ))}
              </div>
            ) : (
              <div className="empty">
                <Heading size={500}>No matching sample records</Heading>
                <Paragraph marginTop={8}>
                  Remove a tag or change the plan to broaden the selection.
                </Paragraph>
                <Button
                  marginTop={16}
                  onClick={() => {
                    setTags([]);
                    setPlan("Any");
                    setSaved(null);
                  }}
                >
                  Clear rules
                </Button>
              </div>
            )}
            {saved && (
              <Alert
                intent="success"
                title="Local audience saved"
                marginTop={20}
              >
                {saved.name} · {saved.count} sample records. Nothing was sent to
                Segment.
              </Alert>
            )}
          </section>
        </div>
        <Dialog
          isShown={open}
          title="Review local audience"
          onCloseComplete={() => setOpen(false)}
          confirmLabel="Save locally"
          onConfirm={() => {
            setSaved({ name: name.trim(), count: matches.length });
            setOpen(false);
          }}
          width={560}
        >
          <Paragraph>
            <strong>{name}</strong> matches {matches.length} of {people.length}{" "}
            fictional records.
          </Paragraph>
          <Paragraph marginTop={12}>
            Plan: {plan}. Required tags: {tags.join(", ") || "none"}.
          </Paragraph>
          <Paragraph marginTop={12}>
            This saves only a local snapshot; it does not create a Segment
            audience.
          </Paragraph>
        </Dialog>
        <footer>
          Native Evergreen 7.1.9 React components. Original audience logic; no
          analytics or customer service connection.
        </footer>
      </main>
    </ThemeProvider>
  );
}
createRoot(document.getElementById("root")).render(<App />);

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: #f4f5f9;
  color: #101840;
  font:
    14px/1.5 system-ui,
    sans-serif;
}
.audience {
  padding: 32px;
}
.audience header {
  max-width: 800px;
  margin-bottom: 28px;
}
.audience-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.5fr);
  gap: 24px;
}
.rule-panel,
.results-panel {
  padding: 24px;
  background: white;
  border: 1px solid #d8dae5;
  border-radius: 8px;
  min-width: 0;
}
.rule-panel > label {
  font-weight: 600;
  display: block;
  margin-bottom: 8px;
}
.results-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.record-list article {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid #edeff5;
}
.record-list article:first-child {
  padding-top: 0;
}
.record-list article:last-child {
  border: 0;
}
.tag-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.empty {
  padding: 36px 12px;
  text-align: center;
  background: #f4f5f9;
  border-radius: 4px;
}
.audience footer {
  margin-top: 24px;
  font-size: 12px;
  color: #696f8c;
}
.audience input {
  max-width: 100%;
}
[role="dialog"] {
  max-width: calc(100vw - 32px);
}
@media (max-width: 850px) {
  .audience-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 550px) {
  .audience {
    padding: 16px;
  }
  .rule-panel,
  .results-panel {
    padding: 20px;
  }
  .record-list article {
    align-items: flex-start;
    flex-direction: column;
  }
  .results-title {
    align-items: flex-start;
  }
}