* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}

.upload-container {
  text-align: center;
  background-color: #ffffff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  width: 300px;
}

.upload-container h1 {
  font-size: 1.5em;
  margin-bottom: 20px;
  color: #333;
}

#fileInput {
  display: block;
  margin: 20px auto;
  border: 1px solid #ddd;
  padding: 10px;
  border-radius: 4px;
  width: 100%;
}

button {
  background-color: #4CAF50;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

#message {
  margin-top: 15px;
  color: #ff0000;
}

.back-chevron {
  display: inline-flex;
  align-items: center;
  color: #0078d4;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
  margin: 15px;
}

.back-chevron:hover {
  color: #005a9e;
}

.chevron {
  font-size: 24px;
  margin-right: 8px;
  transition: margin-right 0.3s;
}

.back-chevron:hover .chevron {
  margin-right: 12px;
}

.header-image {
  display: block;
  margin: 0 auto 0;
  max-width: 40%;
  height: auto;
}

.loader {
      display: none;
      width: 48px;
      height: 48px;
      border: 5px solid #FFF;
      border-bottom-color: #FF3D00;
      border-radius: 50%;
      margin: 20px auto;
      animation: rotation 1s linear infinite;
  }

  @keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .email-input {
    display: none;
    margin-bottom: 15px;
  }

  .email-input input[type="email"] {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
  }

  .error-message {
    color: #ff0000;
    font-size: 14px;
    margin-top: 5px;
    display: none;
  }