body { 
  font-family: 'Roboto', sans-serif;  
  margin: 0; 
  padding: 0;
  width: 615px; 
  height: 125vh;
  background-color: #f8f8f8;
  box-sizing: border-box;
  display: flex;
  align-items: center; 
  justify-content: center; 
}

.popup-container {
  display: flex;
  flex-direction: column;
  align-items: center;  
  justify-content: flex-start; 
  width: 600px; 
  height: auto; 
  gap: 20px; 
  padding: 20px;
  box-sizing: border-box;
  border-radius: 10px;  
  background-color: white; 
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5); 
  overflow: hidden; 
}
.header {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5em; 
    font-weight: bold;
    color: #333;
    text-align: center;
    background-color: #eaeaea; 
    padding: 10px 15px; 
    border-radius: 8px; 
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1); 
    width: 100%; 
    margin-bottom: 20px;
    box-sizing: border-box; }
  

textarea {
  width: 555px;  
  height: 120px;  
  padding: 10px;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid #ccc;
  margin-bottom: 15px;
}

#summary {
  margin-top: 10px;
  padding: 20px;  
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  min-height: 120px;  
  min-width: 300px;
  white-space: pre-wrap;
  word-wrap: break-word;
  width: 100%;  
  max-height: 300px; 
  overflow-y: auto;  
  font-size: 16px; 

}

/* General Button Style*/
button {
  width: 100%;  
  padding: 12px;
  font-size: 16px;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 10px;
  transition: background-color 0.3s ease, transform 0.1s ease;
}

button:hover {
  background-color: #0056b3;
}

button:active {
  background-color: #004085;
  transform: scale(0.98);
}

/* Summarize Button */
#summarizeBtn {
  background-color: #3498db;
  font-weight: bold;  
}

#summarizeBtn:hover {
  background-color: #2980b9;
}

#summarizeBtn:active {
  background-color: #1c5987;
}

#summarizeBtn {
  padding: 14px;
  font-size: 18px; 
}

/* Generate Citation Button */
#generateCitation {
  background-color: #3498db;
  font-weight: bold;  
}

#generateCitation:hover {
  background-color: #1c5987;
}

#generateCitation:active {
  background-color: #1c5987;
}

#clearBtn {
  width: 45%; 
  padding: 12px;
  background-color:  #1abc9c;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#clearBtn:hover {
  background-color: #16a085;
}

#clearBtn:active {
  background-color: #16a085;
}

/* Loading Spinner */
.loading-spinner {
  width: 30px;
  height: 30px;
  border: 5px solid #f3f3f3;
  border-top: 5px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

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