* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: white;
  color: black !important;
}

header {
  background-color: gray;
  color: black !important;
  text-align: center;
  padding: 30px 20px;
}

header h1 {
  font-size: 2.2em;
  margin-bottom: 10px;
  color: black !important;
}

header p {
  font-size: 1em;
  font-weight: bold;
  color: black !important;
}

nav {
  background-color: lightgray;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  padding: 12px 10px;
}

nav a {
  color: black !important;
  text-decoration: none;
  font-weight: 600;
  font-size: 1em;
  padding: 8px 14px;
  border-radius: 4px;
}

nav a:hover {
  background-color: #ffb400;
  color: black !important;
}

main {
  max-width: 1000px;
  margin: auto;
  padding: 30px 20px;
  background: white;
  color: black !important;
}

section {
  margin-bottom: 40px;
  color: black !important;
}

h2 {
  font-size: 1.6em;
  color: black !important;
  margin-bottom: 15px;
  border-bottom: 2px solid black;
  padding-bottom: 5px;
}

p, ul, li {
  font-size: 1.05em;
  line-height: 1.6;
  color: black !important;
}

ul {
  margin-left: 20px;
}

li {
  margin-bottom: 10px;
}

.btn-primary {
  display: inline-block;
  margin-top: 20px;
  background-color: #ffb42550;
  color: black !important;
  padding: 12px 24px;
  font-weight: bold;
  text-decoration: none;
  border-radius: 6px;
}

.btn-primary:hover {
  background-color: #e0a700;
  color: black !important;
}

footer {
  text-align: center;
  background-color: #002b5aaa;
  color: black !important;
  padding: 20px 10px;
  font-size: 0.9em;
}

/* Responsive */
@media (max-width: 768px) {
  header h1 {
    font-size: 1.8em;
  }
  nav {
    flex-direction: column;
    align-items: center;
  }
  nav a {
    font-size: 1em;
    padding: 10px 12px;
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  main {
    padding: 20px 10px;
  }
}
#background-chart {
  position: fixed;          /* fixed behind content */
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;              /* behind everything */
  opacity: 0.15;            /* subtle */
  pointer-events: none;     /* clicks go through */
  background-color: #000;   /* optional dark background */
}