SumUp Circuit 设计系统.

import React, { useState, useRef } from "react";
import { createRoot } from "react-dom/client";
import { Input, Checkbox, Button, Headline, Body } from "@sumup/circuit-ui";
import "@sumup/design-tokens/light.css";
import "@sumup/circuit-ui/styles.css";
import "./circuit.css";
function App() {
  const [name, setName] = useState("Studio print"),
    [price, setPrice] = useState("24.00"),
    [note, setNote] = useState(true),
    [errors, setErrors] = useState({}),
    [review, setReview] = useState(null);
  const nameRef = useRef(),
    priceRef = useRef();
  const valid = /^\d{1,5}(\.\d{1,2})?$/.test(price) && Number(price) > 0;
  const amount = valid
    ? new Intl.NumberFormat("en-IE", {
        style: "currency",
        currency: "EUR",
      }).format(Number(price))
    : "—";
  function change(fn) {
    fn();
    setReview(null);
    setErrors({});
  }
  function submit(e) {
    e.preventDefault();
    const next = {};
    if (!name.trim()) next.name = "Enter an item name.";
    if (!valid)
      next.price = "Use a positive amount with up to two decimal places.";
    setErrors(next);
    if (next.name) {
      nameRef.current.focus();
      return;
    }
    if (next.price) {
      priceRef.current.focus();
      return;
    }
    setReview({ name: name.trim(), amount, note });
  }
  return (
    <main className="circuit-example">
      <header>
        <p className="eyebrow">MERCHANT TOOLS / LOCAL SPECIMEN</p>
        <Headline as="h1">Prepare a simple item</Headline>
        <Body>
          Review how an item could appear to a customer. This example never
          creates a payment link.
        </Body>
      </header>
      <div className="circuit-grid">
        <form onSubmit={submit} noValidate>
          <h2>Item details</h2>
          <Input
            ref={nameRef}
            label="Item name"
            required
            value={name}
            maxLength={80}
            invalid={!!errors.name}
            validationHint={
              errors.name || "Use a short name the customer can recognize."
            }
            onChange={(e) => change(() => setName(e.target.value))}
          />
          <Input
            ref={priceRef}
            label="Price in EUR"
            required
            inputMode="decimal"
            value={price}
            invalid={!!errors.price}
            validationHint={
              errors.price || "Example amount only; no charge will be made."
            }
            onChange={(e) => change(() => setPrice(e.target.value))}
          />
          <Checkbox
            label="Show a customer note field"
            checked={note}
            onChange={(e) => change(() => setNote(e.target.checked))}
          />
          <Button variant="primary" type="submit" stretch>
            Review item locally
          </Button>
          {review && (
            <div className="review" role="status">
              <strong>Item reviewed</strong>
              <p>
                {review.name} · {review.amount}
              </p>
              <small>
                Local snapshot only. No payment link or charge created.
              </small>
            </div>
          )}
        </form>
        <section className="preview-surface" aria-labelledby="preview-heading">
          <h2 id="preview-heading">Customer-side preview</h2>
          <div className="receipt">
            <div className="shop-mark" aria-hidden="true">
              N
            </div>
            <p className="shop-name">Northstar Studio</p>
            <div
              className="print-art"
              role="img"
              aria-label="Original geometric print illustration"
            >
              <i></i>
              <b></b>
              <span></span>
            </div>
            <h3>{name.trim() || "Your item name"}</h3>
            <p className="receipt-price">{amount}</p>
            {note && (
              <div className="note-placeholder">
                <span>Customer note</span>
                <p>A note field would appear here.</p>
              </div>
            )}
            <div className="preview-action">
              Preview only · checkout unavailable
            </div>
          </div>
        </section>
      </div>
      <footer>
        Native Circuit UI 8.15.0 components and design tokens 7.3.1. Original
        item editor and illustration by OpenDesign.
      </footer>
    </main>
  );
}
createRoot(document.getElementById("root")).render(<App />);

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--cui-bg-normal);
  color: var(--cui-fg-normal);
  font: 16px/1.5 var(--cui-font-stack-default);
}
.circuit-example {
  padding: 32px;
}
.circuit-example header {
  max-width: 720px;
  margin-bottom: 32px;
}
.eyebrow {
  font-size: 12px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  color: var(--cui-fg-subtle);
}
.circuit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 1fr);
  gap: 48px;
}
.circuit-example h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 24px;
}
.circuit-example form {
  max-width: 540px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.circuit-example form h2 {
  margin: 0;
}
.preview-surface {
  background: var(--cui-bg-subtle);
  padding: 28px;
  border-radius: 16px;
}
.preview-surface > h2 {
  font-size: 14px;
  color: var(--cui-fg-subtle);
  text-align: center;
}
.receipt {
  max-width: 340px;
  margin: auto;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px #0000000d;
  padding: 24px;
}
.shop-mark {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #0f131a;
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  margin: auto;
}
.shop-name {
  text-align: center;
  font-size: 14px;
  margin: 12px 0 20px;
}
.print-art {
  height: 150px;
  background: #f5dfbb;
  position: relative;
  overflow: hidden;
  border-radius: 8px;
}
.print-art i {
  position: absolute;
  left: 24px;
  bottom: 0;
  width: 100px;
  height: 130px;
  border-radius: 60px 60px 0 0;
  background: #ce663d;
}
.print-art b {
  position: absolute;
  right: 20px;
  top: 20px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: #385d50;
}
.print-art span {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 24px;
  background: #202e2a;
}
.receipt h3 {
  font-size: 20px;
  line-height: 1.3;
  margin: 20px 0 8px;
  overflow-wrap: anywhere;
}
.receipt-price {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 24px;
}
.note-placeholder {
  padding: 12px;
  border: 1px solid #bfc6cf;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 12px;
}
.note-placeholder span {
  font-weight: 700;
}
.note-placeholder p {
  margin: 4px 0 0;
  color: #4f5a65;
}
.preview-action {
  background: #e9edf2;
  text-align: center;
  border-radius: 999px;
  padding: 12px;
  font-size: 12px;
  color: #4f5a65;
}
.review {
  padding: 20px;
  background: #e7f5ef;
  border-radius: 8px;
}
.review p {
  margin: 8px 0;
}
.review small {
  font-size: 12px;
}
.circuit-example footer {
  font-size: 12px;
  color: var(--cui-fg-subtle);
  margin-top: 32px;
}
@media (max-width: 850px) {
  .circuit-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .circuit-example form {
    max-width: none;
  }
}
@media (max-width: 550px) {
  .circuit-example {
    padding: 20px 16px;
  }
  .preview-surface {
    padding: 20px;
  }
  .receipt {
    padding: 20px;
  }
}