/* BINS Project Header & Buttons */
.main-header {
    background-color: #232F3E;
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    position: fixed; top: 0; left: 0; right: 0;
    width: 100%; z-index: 1000;
  }
  .logo { height: 40px; margin-right: 1rem; }
  .header-title { color: #fff; font-size: 1.2rem; font-weight: bold; margin-right: auto; }
  .nav-btn {
    background-color: #FF9900; color: #111;
    border: none; border-radius: 5px;
    padding: 0.5rem 1rem; margin-left: 0.5rem;
    cursor: pointer; font-weight: bold;
  }
  .nav-btn:hover { background-color: #e48f00; }
  .page-container {
    margin-top: 70px;
    width: 95%; margin: 0 auto;
    padding: 1rem;
    background-color: #fff; border-radius: 6px;
  }
  .form-input, .form-textarea {
    width: 90%; margin: 0.5rem auto;
    display: block; padding: 0.5rem;
    border: 1px solid #ccc; border-radius: 6px;
  }
  .big-button {
    background-color: #28a745; color: white;
    padding: 0.75rem 1.5rem;
    border: none; border-radius: 6px;
    cursor: pointer; font-size: 1rem;
    margin: 1rem auto; display: block;
  }
  .big-button:hover { background-color: #218838; }
  .hidden { display: none; }
  
  /* Existing styles */
  body { font-family: Arial, sans-serif; margin: 20px; }
  #heatmap-container { height: 500px; width: 100%; }
  canvas { max-width: 600px; margin: 20px auto; display: block; }