/* ===== Base Styling (Light Mode) ===== */
body {
  background-color: #ffffff;
  color: #111111;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 20px;
  text-align: center;
}

main, section {
  max-width: 800px;
  margin: 0 auto 50px auto;
}

h1, h2, h3 {
  color: #111111;
  border-bottom: 1px solid #ccc;
  padding-bottom: 5px;
  margin-top: 40px;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  margin: 15px auto;
  padding-left: 0;
  list-style: none;
  text-align: left;
  display: inline-block;
}

ul li {
  margin-bottom: 10px;
}

footer {
  color: #666;
  margin-top: 60px;
}

/* ===== Dark Mode ===== */
.dark-mode {
  background-color: #111111;
  color: #f2f2f2;
}

.dark-mode h1, .dark-mode h2, .dark-mode h3 {
  color: #ffffff;
  border-color: #333;
}

.dark-mode a {
  color: #4db8ff;
}

.dark-mode footer {
  color: #aaaaaa;
}

/* ===== Toggle Theme Button ===== */
#theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 10px 15px;
  background-color: #333;
  color: #f2f2f2;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  z-index: 1000;
}

#theme-toggle:hover {
  background-color: #444;
}