* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
  min-height: 100vh;
  display: block;
}

nav {
  background-color: #8BC34A;
  padding: 0.5em;
}

nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  list-style: none;
  gap: 1rem;
  align-items: center;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

nav ul li a:hover,
nav ul li a:focus {
  text-decoration: underline;
  outline: none;
}

aside {
  background-color: #e0f7fa;
  padding: 1em;
  text-align: center;
  font-style: italic;
}

main {
  padding: 2em 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
  width: 100%;
}

.activities {
  background: #fff;
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid #e6e6e6;
}

.questions {
  background-color: #fff;
  text-align: left;
  font-style: normal;
  padding: 1rem;
  border: 1px solid #e6e6e6;
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.media-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1em;
  margin: 2em 0;
}

.video-container,
.image-container {
  flex: 1 1 300px;
  max-width: 500px;
  aspect-ratio: 16 / 9;
  background: #fff;
}

.video-container iframe,
.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
  display: block;
}

footer {
  background-color: #8BC34A;
  color: white;
  text-align: center;
  padding: 1em;
  margin-top: 2em;
}

@media (max-width: 900px) {
  nav ul {
    flex-direction: column;
    align-items: center;
  }

  main {
    padding: 1em;
  }

  .video-container,
  .image-container {
    max-width: 100%;
    aspect-ratio: auto;
    height: auto;
  }

  .video-container iframe,
  .image-container img {
    height: auto;
    object-fit: contain;
  }

  .two-column {
    grid-template-columns: 1fr;
  }

  .questions {
    margin-top: 1rem;
  }
}