:root {
    /* Primary color palette - refined for professionalism */
    --color-green-primary: #4CAF50;
    --color-green-dark: #388E3C;
  
    /* Updated red to be more professional/corporate */
    --color-red-primary: #E53935;  /* Slightly less saturated red */
    --color-red-dark: #C62828;     /* Deeper, more mature red */
    
    /* Updated brown to be more sophisticated */
    --color-brown-light: #8D6E63; 
    --color-brown-primary: #6D4C41; /* More balanced mid-tone brown */
    --color-brown-dark: #5D4037;    /* Deeper brown with less redness */
    --color-brown-darker: #4E342E;  /* Dark neutral brown */
    
    /* Neutral colors - improved contrast */
    --color-background: #FAFAFA;
    --color-text: #212121;
    --color-text-secondary: #616161;
    --color-white: #FFFFFF;
    --color-border: #E0E0E0;
    
    /* Opacity variants */
    --color-brown-medium: rgba(78, 52, 46, 0.15);
    --color-green-shadow: rgba(76, 175, 80, 0.2);
    
    /* Spacing variables */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  }
  
  html {
    box-sizing: border-box;
  }
  
  *, *:before, *:after {
    box-sizing: inherit;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.5;
    margin: 0;
    padding: 0;
  }

  .title-container {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  #companyNumberEdit {
    width: 75px;
}

  .graph-icon {
      width: 32px;
      height: 32px;
  }
  
  /* Container & Layout */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md);
  }
  
  /* Typography */
  h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.2;
  }
  
  h1 {
    font-size: 28px;
    margin-bottom: var(--space-md);
    letter-spacing: -0.5px;
  }
  
  p {
    margin-top: 0;
    margin-bottom: var(--space-md);
  }
  
  strong {
    font-weight: 600;
  }
  
  a {
    text-decoration: none;
    color: var(--color-green-dark);
    transition: color 0.2s, text-decoration 0.2s;
  }
  
  a:hover {
    color: var(--color-green-primary);
    text-decoration: underline;
  }
  
  /* Form Elements */
  label {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    display: block;
    color: var(--color-brown-darker);
  }
  
  input[type="text"] {
    display: block;
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 16px;
    line-height: 1.5;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-white);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: var(--shadow-sm);
  }
  
  input[type="text"]:hover {
    border-color: var(--color-brown-medium);
  }
  
  input[type="text"]:focus {
    outline: none;
    border-color: var(--color-green-primary);
    box-shadow: 0 0 0 3px var(--color-green-shadow);
  }
  
  input[type="text"]::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.6;
  }
  
  input.invalid {
    border-color: var(--color-red-primary);
    background-color: rgba(244, 67, 54, 0.03);
  }
  
  input.invalid:focus {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.2);
  }
  
  /* Buttons */
  button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: 15px;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--color-green-primary);
    color: var(--color-white);
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
  }
  
  button:hover {
    background-color: var(--color-green-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
  }
  
  button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
  }
  
  button:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-green-shadow);
  }
  
  button.secondary {
    background-color: var(--color-brown-primary);
  }
  
  button.secondary:hover {
    background-color: var(--color-brown-dark);
  }
  
  button.secondary:focus {
    box-shadow: 0 0 0 3px rgba(121, 85, 72, 0.3);
  }
  
  button.danger {
    background-color: var(--color-red-primary);
  }
  
  button.danger:hover {
    background-color: var(--color-red-dark);
  }
  
  button.danger:focus {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.3);
  }
  
  /* Header Container */
  #header-container {
    padding: var(--space-lg) var(--space-lg) var(--space-md);
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-lg);
  }
  
  #header-container h1 {
    margin-bottom: var(--space-xs);
    color: var(--color-brown-darker);
    font-weight: 700;
  }
  
  /* Description */
  #description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 15px;
    max-width: 600px;
  }
  
  #description strong {
    color: var(--color-brown-darker);
  }
  
  /* Form Container */
  #form-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
  }
  
  #form-container input[type="text"] {
    flex: 1;
    min-width: 250px;
    max-width: 400px;
  }
  
  /* Loading Spinner */
  .spinner {
    display: none;
    width: 30px;
    height: 30px;
    border: 3px solid rgba(121, 85, 72, 0.1);
    border-radius: 50%;
    border-top-color: var(--color-green-primary);
    animation: spin 0.8s linear infinite;
    margin: var(--space-lg) auto;
  }
  
  @keyframes spin {
    to {
      transform: rotate(360deg);
    }
  }
  
  /* Error Message */
  #error-message {
    display: none;
    background-color: rgba(244, 67, 54, 0.03);
    border: 1px solid rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--color-red-primary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin: var(--space-md) 0;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
    animation: fadeIn 0.3s ease-out;
  }
  
  .error-icon {
    color: var(--color-red-primary);
    font-size: 20px;
    margin-right: var(--space-md);
  }
  
  .error-content strong {
    color: var(--color-red-dark);
    display: block;
    margin-bottom: var(--space-xs);
    font-size: 16px;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* Graph container */
  #cy {
    width: 100%;
    height: 70vh;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
  }
  
  /* Animation for input validation */
  @keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
  }
  
  .shake {
    animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
  }
  
  /* Responsive adjustments */
  @media (max-width: 768px) {
    #header-container {
      padding: var(--space-md);
    }
    
    #form-container {
      flex-direction: column;
      align-items: stretch;
    }
    
    #form-container input[type="text"] {
      max-width: none;
    }
    
    button {
      width: 100%;
      margin-left: 0;
    }
  }

  .footer {
    margin-top: 0;
    padding: var(--space-md) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    position: relative;
  }
  
  .contact-link {
    display: inline-flex;
    align-items: center;
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: color 0.2s;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
  }
  
  .contact-link:hover {
    color: var(--color-green-dark);
    text-decoration: none;
    background-color: var(--color-brown-medium);
  }
  
  .mail-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--space-xs);
    opacity: 0.8;
  }
  
  .contact-link:hover .mail-icon {
    opacity: 1;
  }

  .question-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--space-xs);
    opacity: 0.8;
  }
  
  .contact-link:hover .question-icon {
    opacity: 1;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    align-items: center;
  }
  
  .about-popup {
    position: absolute;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-lg);
    max-width: 300px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    margin-bottom: 10px;
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.5;
  }
  
  .about-popup.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }
  
  .about-popup::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--color-white);
  }
  
  .about-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--color-border);
    margin-top: 1px;
  }