* {
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      margin: 0;
      padding: 0;
      background: linear-gradient(to right, #f0f2f5, #dbeafe);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .container {
      background-color: #ffffff;
      padding: 2rem 2.5rem;
      border-radius: 16px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
      width: 100%;
      max-width: 500px;
      text-align: center;
    }

    h1 {
      margin-bottom: 1.5rem;
      font-size: 1.75rem;
      color: #1e3a8a;
    }

    label {
      display: block;
      text-align: left;
      font-weight: bold;
      margin-bottom: 0.5rem;
      color: #374151;
    }

    textarea {
      width: 100%;
      height: 120px;
      padding: 0.75rem;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      font-size: 1rem;
      resize: vertical;
      margin-bottom: 1rem;
      transition: border-color 0.3s ease;
    }

    textarea:focus {
      border-color: #3b82f6;
      outline: none;
    }

    button {
      background-color: #2563eb;
      color: white;
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      cursor: pointer;
      transition: background-color 0.3s ease;
    }

    button:hover {
      background-color: #1d4ed8;
    }

    #qrcode {
      margin-top: 2rem;
    }

    #qrcode img {
      border-radius: 12px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    .error {
      color: red;
      font-weight: bold;
      margin-top: 1rem;
    }

    .image-logo {
      max-width: 150px;
    }