JavaScript & HTML プレイグラウンド

<main class="welcome-card">
  <span class="eyebrow">Nobuf Playground</span>
  <h1 id="greeting">Build something useful.</h1>
  <p>Edit HTML, CSS, and JavaScript, then see the result instantly.</p>
  <button id="hello-button" type="button">Say hello</button>
  <output id="message" aria-live="polite"></output>
</main>

:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #ecfdf5, #f8fafc 52%, #eff6ff);
  color: #0f172a;
}

.welcome-card {
  width: min(34rem, calc(100% - 3rem));
  padding: 2.5rem;
  border: 1px solid rgba(16, 185, 129, .22);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, .88);
  box-shadow: 0 24px 70px rgba(15, 23, 42, .12);
}

.eyebrow { color: #059669; font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: .75rem 0; font-size: clamp(2rem, 8vw, 3.25rem); line-height: 1.05; }
p { color: #64748b; line-height: 1.7; }
button { padding: .75rem 1rem; border: 0; border-radius: .75rem; background: #10b981; color: white; font: inherit; font-weight: 700; cursor: pointer; }
output { display: block; min-height: 1.5rem; margin-top: 1rem; color: #047857; font-weight: 650; }

const button = document.querySelector('#hello-button');
const message = document.querySelector('#message');

button.addEventListener('click', () => {
  message.textContent = 'Hello from the sandbox 👋';
  console.log('Button clicked', { at: new Date(), private: true });
});

console.info('Playground ready');