白話字

<!DOCTYPE html>
<html lang="zh-Hant">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>隨機字母顯示</title>
  <style>
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "Noto Sans TC", Arial, sans-serif;
      background: linear-gradient(180deg, #f5f9ff 0%, #eef4ff 100%);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      color: #1f2a44;
    }
    .container {
      width: min(900px, 92vw);
      min-height: 80vh;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 32px 24px 40px;
    }
    .top-area {
      display: flex;
      justify-content: center;
      align-items: flex-start;
      padding-top: 10px;
    }
    .start-btn {
      background: #1976d2;
      color: white;
      border: none;
      border-radius: 14px;
      padding: 16px 42px;
      font-size: 24px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 10px 24px rgba(25, 118, 210, 0.28);
      transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
    }
    .start-btn:hover {
      background: #1565c0;
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(25, 118, 210, 0.32);
    }
    .start-btn:active {
      transform: translateY(0);
    }
    .columns {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: stretch;
    }
    .panel {
      background: rgba(255, 255, 255, 0.92);
      border-radius: 24px;
      padding: 28px;
      min-height: 280px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      box-shadow: 0 12px 30px rgba(31, 42, 68, 0.08);
      border: 1px solid rgba(25, 118, 210, 0.08);
    }
    .panel-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
      color: #244a86;
      letter-spacing: 1px;
    }
    .letter {
      font-size: clamp(84px, 12vw, 140px);
      font-weight: 800;
      color: #0d47a1;
      line-height: 1;
      user-select: none;
    }
    .hint {
      margin-top: 18px;
      font-size: 15px;
      color: #657089;
    }
    @media (max-width: 640px) {
      .container {
        min-height: auto;
        gap: 28px;
        padding: 24px 16px 28px;
      }
      .columns {
        grid-template-columns: 1fr;
      }
      .panel {
        min-height: 220px;
      }
      .start-btn {
        width: 100%;
        max-width: 280px;
      }
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="top-area">
      <button class="start-btn" id="startBtn">開始</button>
    </div>
    <div class="columns">
      <div class="panel">
        <div class="panel-title">左側欄位・子音</div>
        <div class="letter" id="consonant">-</div>
        <div class="hint">隨機顯示英文子音字母</div>
      </div>
      <div class="panel">
        <div class="panel-title">右側欄位・母音</div>
        <div class="letter" id="vowel">-</div>
        <div class="hint">隨機顯示英文母音字母</div>
      </div>
    </div>
  </div>
  <script>
    const consonants = ['B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z'];
    const vowels = ['A', 'E', 'I', 'O', 'U'];
    const consonantEl = document.getElementById('consonant');
    const vowelEl = document.getElementById('vowel');
    const startBtn = document.getElementById('startBtn');
    let timer = null;
    function getRandomItem(arr) {
      return arr[Math.floor(Math.random() * arr.length)];
    }
    function updateLetters() {
      consonantEl.textContent = getRandomItem(consonants);
      vowelEl.textContent = getRandomItem(vowels);
    }
    startBtn.addEventListener('click', () => {
      updateLetters();
      if (timer) {
        clearInterval(timer);
      }
      timer = setInterval(updateLetters, 1000);
    });
  </script>
</body>
</html>