body {
  margin: 0;
  padding: 0;
  font-family: 'DM Sans', sans-serif;
  background-color: #F0FDF4; /* light green background */
}

.copilot-container {
  max-width: 850px;
  margin: 60px auto;
  padding: 2.5rem;
  background-color: #ffffff;
  border-radius: 24px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
  font-family: 'DM Sans', sans-serif;
  border: 2px solid #CFFCEE;
}

.copilot-container h1 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  color: #024023;
  margin-bottom: 1.5rem;
}

.copilot-container h2 {
  font-size: 1.3rem;
  color: #2B3674;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

form#upload-form {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

form#upload-form input[type="file"] {
  padding: 0.7rem;
  border: 1px solid #CBD5E1;
  border-radius: 12px;
  font-size: 0.95rem;
  background-color: #f8fafc;
  color: #1e293b;
}

form#upload-form button {
  padding: 0.7rem 1.5rem;
  background-color: #024023;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

form#upload-form button:hover {
  background-color: #1DE5AC;
  color: #024023;
}

#output {
  background-color: #F1F5F9;
  padding: 1.2rem;
  border-radius: 14px;
  color: #1e293b;
  font-size: 1rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.04);
  margin-bottom: 1.5rem;
}

.chat-section {
  margin-top: 2rem;
}

.chat-section input[type="text"] {
  width: 80%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border-radius: 12px;
  border: 1px solid #CBD5E1;
  margin-bottom: 1rem;
}

.chat-section button {
  padding: 0.75rem 1.25rem;
  background-color: #024023;
  color: white;
  font-size: 1rem;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}

.chat-section button:hover {
  background-color: #1DE5AC;
  color: #024023;
}

#chat-output {
  margin-top: 1rem;
  background-color: #E0F7EF;
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: #1E293B;
}