/* Base styles */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  color: #222;
  text-align: center;
}

/* Navigation bar */
.nav-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  background: #222;
  padding: 0.5em 0;
  gap: 0.5em;
}

.nav-button {
  color: #fff;
  background: #444;
  text-decoration: none;
  padding: 0.75em 1.5em;
  margin: 0.25em;
  border-radius: 6px;
  font-size: 1em;
  transition: background 0.2s, color 0.2s;
  display: inline-block;
  border: none;
  cursor: pointer;
}

.nav-button:hover,
.nav-button:focus {
  background: #0077cc;
  color: #fff;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  text-align: center;
  margin-top: 1.2em;
  margin-bottom: 0.6em;
  font-weight: bold;
}

/* Paragraphs */
p {
  text-align: center;
  margin: 1em auto;
  line-height: 1.7;
  max-width: 900px;
  padding: 0 1em;
}

/* Lists */
ul, ol {
  text-align: center;
  display: inline-block;
  margin: 1em auto;
  padding-left: 2em;
  text-align: left;
  width: auto;
  max-width: 700px;
}

li {
  text-align: left;
  margin: 0.5em 0;
}

/* Tables */
table {
  margin: 2em auto;
  border-collapse: collapse;
  width: 90%;
  max-width: 900px;
  text-align: center;
}

th, td {
  border: 1px solid #ccc;
  padding: 0.5em;
  text-align: center;
}

/* Responsive navigation for mobile */
@media (max-width: 700px) {
  .nav-container {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }
  .nav-button {
    width: 90vw;
    max-width: 350px;
    margin: 0.3em 0;
    font-size: 1.2em;
    padding: 1em 0;
    border-radius: 8px;
  }
  h1, h2, h3 {
    font-size: 1.15em;
  }
  p, ul, ol, table {
    font-size: 1em;
    padding: 0 0.5em;
    max-width: 98vw;
  }
  table {
    width: 98vw;
  }
}

/* Optional: Make sure images scale on mobile */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0.5em auto;
}