/* ===========================================================
   mainPage.css – Book-style theme (Numerical Simulation of Optical Wave Propagation)
   =========================================================== */

/* mainPage.css — page-specific layout styling */

/* ===== Main Content Box ===== */
main.text {
  background-color: #FFFFFF;
  color: #000;
  border-radius: 8px;
  padding: 1.5em;
  margin: 2em auto;
  max-width: 900px;
  line-height: 1.6;
}

/* ===== Table of Contents ===== */
.toc {
  padding: 1em;
}
.toc ul {
  list-style-type: none;
  padding: 0;
}
.toc li {
  margin: 0.5em 0;
}

/* ===== Responsive Layout ===== */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
  }
  main.text {
    margin: 1em;
  }
}