/* Base resets */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Roboto', sans-serif;
    background-color: #0d1117; /* GitHub dark background */
    color: #c9d1d9; /* Light text color */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
  }
  
  /* Header */
  header {
    text-align: center;
    margin-top: 20px;
    margin-bottom: 30px;
  }
  
  header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
  }
  
  header p {
    font-size: 1.1rem;
    color: #8b949e;
  }
  
  /* Container Card */
  .container {
    background: #161b22; /* dark card background */
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 600px;
    margin-bottom: 30px;
  }
  
  /* Form Styles */
  form label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 500;
  }
  
  form input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #30363d;
    border-radius: 4px;
    background: #0d1117;
    color: #c9d1d9;
    margin-bottom: 1rem;
    font-size: 1rem;
  }
  
  form input[type="text"]::placeholder {
    color: #8b949e;
  }
  
  form button {
    width: 100%;
    padding: 0.75rem;
    background-color: #238636; /* GitHub accent green */
    color: #ffffff;
    border: none;
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
  }
  
  form button:hover {
    background-color: #2ea043;
  }
  
  /* Button Link on Result Page */
  a.btn {
    display: block;      /* Make it block level */
    width: fit-content;  /* Shrink wrap the button */
    padding: 0.75rem 1rem;
    background-color: #238636;
    color: #ffffff;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    transition: background 0.3s ease;
    margin: 20px auto 0 auto;  /* Center the button and add top margin */
  }
  
  a.btn:hover {
    background-color: #2ea043;
  }
  
  /* Error Message */
  .error {
    color: #f85149;
    font-size: 1.1rem;
    margin-bottom: 1rem;
  }
  
  /* Loading Overlay Styles */
  .loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 17, 23, 0.95);
    z-index: 9999;
    display: none; /* Hidden by default */
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  
  .loading-overlay p {
    margin-top: 1rem;
    font-size: 1.2rem;
    color: #c9d1d9;
  }
  
  /* Spinner Animation */
  .spinner {
    border: 8px solid rgba(255, 255, 255, 0.2);
    border-top: 8px solid #58a6ff;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1.5s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }