body {
  background-color: #0b0231;
}

.page-center {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 12px 72px;
  box-sizing: border-box;
  background-color: #ffffcc;
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.page-center img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-left: auto;
  margin-right: auto;
}


.container {
  max-width: 800px;
  margin: 0 auto 24px;
  padding: 12px 16px;
  box-sizing: border-box;
  border: 1px solid #999900;
  border-radius: 8px;
}

.container::after {
  content: "";
  display: block;
  clear: both;
}

#header {
  text-align: center;
}

.container p {
  margin: 0.6em 0;
}

#header h1 {
  margin: 8px 0;
  color: #009900;
}

.container h2 {
  margin: 0 0 12px;
  color: #999900;
}

#container-9 h3.sub-heading {
  color: #ffffff;
}

.nav-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 10px;
  max-width: 700px;
  margin: 14px auto 4px;
  padding: 0;
  list-style: none;
}

.nav-card {
  box-sizing: border-box;
  flex: 1 1 calc((100% - 30px) / 4);
  min-width: 130px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  background-color: #400040;
  border: 2px solid #999900;
  border-radius: 10px;
  color: #ffff99;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  font-weight: bold;
  font-size: 13px;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.nav-card:hover,
.nav-card:focus-visible {
  transform: scale(1.1);
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.25);
  background-color: #999900;
  color: #330000;
}

.nav-card.nav-link-last-clicked {
  background-color: #7a5aa8;
  border-color: #ffff99;
  color: #ffffff;
}

.photo-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0;
}

.photo-card {
  background-color: #400040;
  border: 1px solid #999900;
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.photo-card:hover,
.photo-card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.25);
}

.photo-card img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

#container-9 .sub-heading {
  margin: 18px 0 4px;
}