AIで要件からクリックできるプロトタイプを作る方法

予約フローの単一HTMLファイルを作ってください。
label/select/buttonと見える状態文を使います。
初期は午前2席、午後2席。ページにつき予約は一つ。
選択なしでは確定不可。選択枠に空席があるときだけ確定します。
予約中は再確定と選択変更を防ぎます。
取り消しは予約枠へ一席だけ戻して予約を消去し、再取消は何もしません。
更新はpoliteのlive regionで通知します。
外部ライブラリ、通信、個人情報、決済、永続化は含めません。
完全HTML、開き方、受け入れ例を返します。
同時予約や本番の保証はしません。

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Session booking · Review prototype</title>
<style>
* { box-sizing: border-box; }
body { margin: 0; background: #f4f6f8; color: #172033; font: 16px/1.6 system-ui, sans-serif; }
main { max-width: 640px; margin: 48px auto; padding: 28px; background: white; border: 1px solid #dce2ea; border-radius: 16px; }
h1 { margin: 8px 0; font-size: 30px; line-height: 1.2; }
p { margin: 12px 0; }
.eyebrow { color: #526077; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
label { display: block; font-weight: 600; margin: 16px 0 6px; }
select, button { font: inherit; padding: 10px 14px; border: 1px solid #aeb9c8; border-radius: 8px; }
select { width: 100%; background: white; color: #172033; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
button { cursor: pointer; background: white; color: #172033; }
#confirm { background: #193e87; color: white; border-color: #193e87; }
button:disabled { opacity: .5; cursor: not-allowed; }
:focus-visible { outline: 3px solid #b56b00; outline-offset: 3px; }
#status { background: #edf3fc; padding: 16px; border-radius: 8px; }
small { display: block; color: #526077; }
fieldset { margin: 28px 0 0; padding: 16px; border: 1px dashed #aeb9c8; border-radius: 8px; }
legend { font-weight: 600; }
@media (max-width: 680px) { main { margin: 16px; padding: 20px; } }
</style>
</head>
<body><main>
<p class="eyebrow">Interactive prototype · Local demo</p>
<h1>Book a workshop session</h1>
<p>Choose a session, confirm your place, or cancel to release it.</p>
<p id="capacity"></p>
<label for="slot">Session</label>
<select id="slot"><option value="">Choose a session</option>
<option value="am">Morning</option><option value="pm">Afternoon</option></select>
<div class="actions">
<button id="confirm" type="button" disabled>Confirm booking</button>
<button id="cancel" type="button" disabled>Cancel booking</button>
</div>
<p id="status" role="status" aria-live="polite"></p>
<small>One booking per page. Refresh resets this demo; other tabs do not share availability.</small>
<fieldset><legend>Review scenarios</legend>
<label for="scenario">Starting availability</label>
<select id="scenario"><option value="normal">Normal · 2 morning / 2 afternoon</option>
<option value="full">Morning full · 0 morning / 2 afternoon</option></select>
<p><small>Changing the scenario clears the current booking and selection. This control is for review only.</small></p>
</fieldset>
</main>
<script>
const capacity = { am: 2, pm: 2 };
const names = { am: "Morning", pm: "Afternoon" };
let selected = "";
let booking = null;
const slot = document.getElementById("slot");
const scenario = document.getElementById("scenario");
const confirmButton = document.getElementById("confirm");
const cancelButton = document.getElementById("cancel");
const status = document.getElementById("status");
const availability = document.getElementById("capacity");
function render(message = "") {
  const valid = Object.hasOwn(capacity, selected);
  confirmButton.disabled = !valid || booking !== null || capacity[selected] <= 0;
  cancelButton.disabled = booking === null;
  slot.disabled = booking !== null;
  availability.textContent = `Available: morning ${capacity.am}, afternoon ${capacity.pm}`;
  status.textContent = message || (booking !== null
    ? `Booked: ${names[booking]}. Your place is reserved in this demo.`
    : valid && capacity[selected] === 0
      ? `${names[selected]} is full. Choose another session.`
      : "Choose a session to book your place.");
}
slot.addEventListener("change", () => { selected = slot.value; render(); });
confirmButton.addEventListener("click", () => {
  if (!Object.hasOwn(capacity, selected) || booking !== null || capacity[selected] <= 0) return;
  capacity[selected] -= 1;
  booking = selected;
  render();
});
cancelButton.addEventListener("click", () => {
  if (booking === null) return;
  const cancelled = names[booking];
  capacity[booking] += 1;
  booking = null;
  selected = "";
  slot.value = "";
  render(`${cancelled} booking cancelled. Your place has been released.`);
});
scenario.addEventListener("change", () => {
  capacity.am = scenario.value === "full" ? 0 : 2;
  capacity.pm = 2;
  booking = null;
  selected = "";
  slot.value = "";
  render("Review scenario reset. Choose a session to test it.");
});
render();
</script>
</body></html>