/* Global page styles */
body {
  font-family: "Segoe UI", sans-serif;
  margin: 40px;
  background-color: #fafafa;
  color: #333;
}

h1 {
  text-align: center;
  margin-bottom: 8px;
}

nav {
  text-align: center;
  margin-bottom: 20px;
}

/* Buttons */
button {
  background: #007acc;
  color: white;
  border: none;
  padding: 10px 16px;
  margin: 0 4px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #005b99;
}
button.active {
  background: #003f66;
}

/* SVG container */
svg {
  display: block;
  margin: auto;
  background-color: white;
  border: 1px solid #ccc;
}

/* Gridlines */
.grid line {
  stroke: #ddd;
  stroke-opacity: 0.8;
  shape-rendering: crispEdges;
}
.grid path {
  stroke-width: 0;
}

/* Points */
circle {
  fill: #4285f4;
  stroke: #fff;
  stroke-width: 1;
  opacity: 0.8;
  transition: r 0.2s, fill 0.2s;
}
circle:hover {
  fill: #d35400;
  r: 7px;
}

/* Annotation text */
#annotation {
  text-align: center;
  font-size: 1.1em;
  margin-bottom: 8px;
}

/* T*