/* Search-friendly navigation and context, without replacing activity styles. */
.resource-breadcrumbs,
.resource-summary {
  box-sizing: border-box;
  width: min(92%, 960px);
  margin: 18px auto;
  color: #2c3e50;
  font: 400 1rem/1.65 Inter, system-ui, sans-serif;
  text-align: center;
}
.resource-breadcrumbs a,
.resource-summary a,
.revision-guide a,
.resource-directory a {
  color: #68304a;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.resource-breadcrumbs {
  padding: 12px 16px;
  border-radius: 10px;
  background: #fff8;
}
.resource-breadcrumbs .breadcrumb-separator {
  padding: 0 8px;
}
.revision-guide,
.resource-directory {
  box-sizing: border-box;
  max-width: 1000px;
  margin: 36px auto;
  padding: 28px;
  border-radius: 16px;
  background: #fff;
  color: #2c3e50;
  text-align: left;
  line-height: 1.7;
}
.revision-guide h2,
.resource-directory h2 {
  font-size: 1.8rem;
}
.revision-guide h3 {
  margin-top: 28px;
}
.revision-guide details {
  padding: 16px 0;
  border-top: 1px solid #ddd;
}
.revision-guide summary {
  font-weight: 600;
  cursor: pointer;
}
.resource-directory ul {
  padding-left: 24px;
}
.resource-directory li {
  margin-bottom: 8px;
}
.resource-directory .directory-subject-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.resource-unavailable {
  opacity: .65;
}
.resource-unavailable small {
  display: block;
}
.homepage .hero h1 {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}
.homepage .hero {
  color: #2c3e50;
}
.homepage .hero .cta-btn {
  color: #253b22;
}
#topic-header h2 {
  font-size: 2.5em;
}
#daily-quiz .quiz-details .quiz-subtitle {
  font-size: 1.6em;
  font-weight: 600;
  color: #46666d;
}
@media (max-width: 600px) {
  .revision-guide,
  .resource-directory {
    margin: 20px 12px;
    padding: 20px;
  }
  .homepage .hero h1,
  #topic-header h2 {
    font-size: 2rem;
  }
}