body { 
  font-family: Arial, sans-serif; 
  margin: 0; 
  background: #f4f6f8; 
}

header { 
  background: #2c3e50;
  color: white;
  padding: 1rem;
  position: relative;
  text-align: center;
}

header h1 {
  margin: 0;
} 

/* Clickable title link */
.title-link {
    color: inherit;
    text-decoration: none;
    display: inline-block;
    padding: 0.1rem 0.25rem;
    border-radius: 4px;
    font-weight: inherit;
}

.title-link:hover {
    text-decoration: underline;
}

.title-link:focus {
    outline: 2px solid #9fd3ff;
    outline-offset: 2px;
    border-radius: 4px;
}

/* General */

.container {
  max-width: 800px; 
  margin: 2rem auto;
  background: white; 
  padding: 2rem; 
  border-radius: 8px;
}
    
input, button { 
  margin: 0.5rem 0; 
  padding: 0.5rem; 
  width: 100%; 
}
    
button { 
  background: #3498db; 
  color: white; 
  border: none; 
  cursor: pointer; 
}

button:hover { 
  background: #2980b9; 
}
    
.results { 
  margin-top: 2rem; 
}

canvas { 
  width: 100%; 
  height: 400px; 
}

textarea {
  width: 100%;
  padding: 0.5rem;
  margin: 0.5rem 0;
  box-sizing: border-box;
}

.label-h3 {
  display: block;        /* ensures it behaves like a heading */
  font-size: 1.17em;     /* typical <h3> size */
  font-weight: bold;     /* headings are bold */
  margin-top: 1em;       /* spacing above */
  margin-bottom: 0.5em;  /* spacing below */
}

.input-choice {
  display: flex;
  justify-content: space-around;
  margin: 1rem 0;
}

.input-choice label {
  font-weight: bold;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.input-choice input[type="radio"] {
  margin-right: 0.5rem;
  vertical-align: middle;
  width: auto;
  flex-shrink: 0;
}

/* Checkbox container */
.checkbox-container {
  margin: 1rem 0;
}

.checkbox-container label {
  font-weight: bold;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.checkbox-container input[type="checkbox"] {
  margin-right: 0.5rem;
  vertical-align: middle;
  width: auto;
  flex-shrink: 0;
}

/* Manual and file input containers */
.manual-input,
.file-input {
  margin: 1rem 0;
}

.hidden {
  display: none;
}

/* Metrics container using flexbox for 3 columns */
.metrics-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
}

.metric {
  flex: 1 0 30%;        /* roughly 3 per row */
  background: #ecf0f1;  /* light gray background */
  padding: 0.75rem;
  border-radius: 6px;
  text-align: center;
}

.metric-label {
  display: block;
  font-weight: bold;
  margin-bottom: 0.25rem;
}

.metric-value {
  font-size: 1.1em;
  color: #2c3e50;
}

/* Example-fill button and label (updated: subtler label + compact inline button) */
.example-controls {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.example-label {
  font-size: 0.85em;
  color: #6c757d; /* muted gray */
  font-weight: normal;
  margin-right: 0.25rem;
}

.example-button {
  display: inline-block;
  width: auto; /* override global button width */
  min-width: 0;
  background: transparent;
  color: #3498db; /* primary color */
  border: 1px solid #3498db;
  padding: 0.25rem 0.5rem;
  font-size: 0.9em;
  border-radius: 4px;
  cursor: pointer;
}

.example-button:hover {
  background: #3498db;
  color: white;
}

.example-data {
  display: none; /* hidden, read by JS */
}

/* GitHub link styling */
.github-container {
  margin-top: 1.5rem;
  text-align: center;
}

.github-link {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #24292e; /* GitHub dark */
  color: #fff;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
  font-size: 0.95rem;
}

.github-link:hover {
  background: #000;
  text-decoration: none;
}

.github-icon {
  width: 18px;
  height: 18px;
  display: inline-block;
  flex: 0 0 18px;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.15rem;
  }
  .github-link {
    position: static;
    transform: none;
    margin-top: 0.5rem;
    font-size: 0.95rem;
  }
}
.github-link svg path {
  fill: currentColor;
}

.github-link:focus {
  outline: 2px solid #9fd3ff;
  outline-offset: 2px;
}