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<!DOCTYPE html>
<html lang="vi">
<head>
  <meta charset="UTF-8">
  <title>CVNSS 4.0 ⇄ Chữ Quốc ngữ</title>
  <style>
    body {
      font-family: Segoe UI, Arial, Helvetica, sans-serif;
      background: #f4f6f8;
      margin: 30px;
      text-align: center;
      color: #333;
    }
    h1 {
      margin-bottom: 18px;
      font-size: 26px;
      color: #2c3e50;
    }
    .wrap {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 14px;
    }
    textarea {
      width: 400px;
      height: 210px;
      padding: 12px;
      font-size: 16px;
      border: 1px solid #dcdcdc;
      border-radius: 8px;
      resize: vertical;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
      box-sizing: border-box;
    }
    textarea:focus {
      border-color: #3498db;
      box-shadow: 0 0 0 2px rgba(52,152,219,0.12);
      outline: none;
    }
    .controls {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin-top: 6px;
    }
    button, .mode-select {
      padding: 8px 18px;
      font-size: 15px;
      border-radius: 6px;
      cursor: pointer;
      border: 1px solid #dcdcdc;
    }
    button {
      color: #fff;
      background-color: #3498db;
      border: none;
      min-width: 90px;
      transition: filter 0.15s;
    }
    button:hover { filter: brightness(1.1);}
    button:active { filter: brightness(0.98);}
    .reset { background: #e74c3c;}
    .mode-select { background: #fff; min-width: 180px;}
    .mode-select:focus {
      border-color: #3498db;
      box-shadow: 0 0 0 2px rgba(52,152,219,0.09);
      outline: none;
    }
    .status-message {
      margin-top: 12px;
      font-size: 13px;
      min-height: 20px;
    }
    .status-success { color: #27ae60;}
    .status-error { color: #c0392b;}
  </style>
</head>
<body>
  <h1>CVNSS 4.0 ⇄ Chữ Quốc ngữ</h1>

  <div class="wrap">
    <textarea id="inputText" placeholder="Nhập văn bản (CVNSS hoặc CQN)"></textarea>
    <textarea id="outputText" placeholder="Kết quả chuyển đổi" readonly></textarea>
  </div>

  <div class="controls">
    <select id="mode" class="mode-select">
      <option value="cvn">CVNSS 4.0 → Chữ Quốc ngữ</option>
      <option value="cqn">Chữ Quốc ngữ → CVNSS 4.0</option>
    </select>
    <button onclick="copyText()">Sao chép</button>
    <button class="reset" onclick="resetAll()">Đặt lại</button>
  </div>
  <div id="statusMessage" class="status-message"></div>

  <script src="cvnss4.0-converter.js"></script>
  <script>
    const inputBox = document.getElementById("inputText");
    const outputBox = document.getElementById("outputText");
    const modeSelect = document.getElementById("mode");
    const statusMessageEl = document.getElementById("statusMessage");

    function convertText() {
      const input = inputBox.value;
      const mode = modeSelect.value;
      if (!input.trim()) {
        outputBox.value = "";
        return;
      }
      try {
        const result = CVNSSConverter.convert(input, mode);
        // Hiển thị kết quả tương ứng với hướng chuyển đổi
        outputBox.value = mode === "cvn" ? result.cqn : result.cvn;
      } catch (e) {
        outputBox.value = "";
        showStatus("Lỗi chuyển đổi: " + e.message, "error");
      }
    }

    inputBox.addEventListener("input", convertText);
    modeSelect.addEventListener("change", convertText);

    async function copyText() {
      if (!outputBox.value.trim()) {
        showStatus("Không có nội dung để sao chép.", "error");
        return;
      }
      try {
        await navigator.clipboard.writeText(outputBox.value);
        showStatus("Đã sao chép vào clipboard!", "success");
      } catch {
        outputBox.select();
        document.execCommand("copy");
        showStatus("Đã sao chép (cách cũ)!", "success");
      }
    }

    function resetAll() {
      inputBox.value = "";
      outputBox.value = "";
      modeSelect.value = "cvn";
      statusMessageEl.textContent = "";
      inputBox.focus();
    }

    function showStatus(message, type="success") {
      statusMessageEl.textContent = message;
      statusMessageEl.className = `status-message status-${type}`;
      setTimeout(() => { statusMessageEl.textContent = ""; }, 2000);
    }
  </script>
</body>
</html>