body {
      font-family: "Be Vietnam Pro", sans-serif;
      margin: 0;
      padding: 0;
      background: linear-gradient(135deg, #8ec5fc 0%, #e0c3fc 100%);
      height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    /* ===================== NÚT DOWNLOAD MỚI ===================== */
    .download-wrap {
      text-align: center;
      margin-bottom: 20px;
      width: 100%;
    }

    .download-btn {
      width: 300px;
      padding: 14px 20px;
      margin: 10px auto;
      font-size: 18px;
      font-weight: 600;
      border: none;
      border-radius: 14px;
      cursor: pointer;
      transition: 0.25s;
      display: block;
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
    }

    .btn-orange {
      background: orange;
      color: white;
    }

    .btn-orange:hover {
      background: rgb(255, 176, 31);
      transform: translateY(-3px);
    }

    .btn-green {
      background: rgb(82, 218, 24);
      color: white;
    }

    .btn-green:hover {
      background: rgb(66, 180, 18);
      transform: translateY(-3px);
    }

    /* ============================================================= */

    .container {
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(10px);
      padding: 40px;
      border-radius: 20px;
      text-align: center;
      width: 90%;
      max-width: 450px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      animation: pop 0.5s ease-out;
    }

    @keyframes pop {
      from {
        transform: scale(0.8);
        opacity: 0;
      }

      to {
        transform: scale(1);
        opacity: 1;
      }
    }

    h2 {
      margin-bottom: 20px;
      color: #333;
      font-weight: 700;
      font-size: 24px;
    }

    .mode-btn {
      width: 100%;
      padding: 15px;
      margin: 15px 0;
      font-size: 18px;
      font-weight: 600;
      border: none;
      border-radius: 14px;
      cursor: pointer;
      transition: 0.25s;
    }

    .mode1 {
      background: #0d6efd;
      color: #fff;
    }

    .mode1:hover {
      background: #0b5ed7;
      transform: translateY(-3px);
    }

    .mode2 {
      background: #198754;
      color: white;
    }

    .mode2:hover {
      background: #157347;
      transform: translateY(-3px);
    }

    /* Modal styles */
    .modal-backdrop {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.5);
      display: none;
      justify-content: center;
      align-items: center;
      z-index: 1000;
      padding: 20px;
    }

    .modal {
      background: white;
      border-radius: 12px;
      max-width: 520px;
      width: 100%;
      padding: 20px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
      text-align: left;
      animation: slideUp 0.2s ease-out;
    }

    @keyframes slideUp {
      from {
        transform: translateY(10px);
        opacity: 0;
      }

      to {
        transform: translateY(0);
        opacity: 1;
      }
    }

    .modal h3 {
      margin: 0 0 8px 0;
      font-size: 20px;
    }

    .modal p {
      margin: 0 0 16px 0;
      line-height: 1.4;
      color: #333;
    }

    .modal .modal-actions {
      display: flex;
      justify-content: flex-end;
      gap: 10px;
    }

    .modal .btn {
      padding: 10px 14px;
      border-radius: 10px;
      font-weight: 600;
      border: none;
      cursor: pointer;
    }

    .btn-cancel {
      background: #f0f0f0;
      color: #333;
    }

    .btn-ok {
      background: #0d6efd;
      color: white;
    }

    /* small screens */
    @media (max-width: 400px) {
      .download-btn {
        width: 85%;
      }
    }