/* responsive.css */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

.container, main, section, .content, .main-container {
  width: 100%;
  padding: 1rem;
}

nav ul {
  padding: 0;
  margin: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    align-items: center;
  }

  .content,
  .flex,
  .columns,
  .main-container {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
  }

  .navigation,
  .sidebar,
  .left,
  .right,
  .panel {
    width: 100% !important;
    margin: 0 auto;
  }

  .class-list, .class-info {
    width: 100% !important;
    padding: 0.5rem;
  }

  h1, h2, h3 {
    text-align: center;
  }
}