:root {
  --topic-accent: #0f766e;
  --topic-accent-strong: #0b5f59;
  --topic-panel: #ffffff;
  --topic-soft: #f1f8f6;
  --topic-border: #dbe5e2;
  --topic-text: #172033;
  --topic-muted: #5b6776;
}

.topic-hub-section,
.topic-writing-section,
.topic-related-section,
.topic-subscribe-section {
  margin-top: 22px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--topic-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.07);
}

.topic-hub-header,
.topic-section-header {
  max-width: 820px;
  margin-bottom: 18px;
}

.topic-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--topic-accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-eyebrow::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--topic-accent);
}

.topic-hub-section h2,
.topic-writing-section h2,
.topic-related-section h2,
.topic-subscribe-section h2 {
  margin: 8px 0 10px;
  color: var(--topic-text);
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  line-height: 1.15;
}

.topic-hub-section p,
.topic-writing-section p,
.topic-related-section p,
.topic-subscribe-section p {
  color: var(--topic-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.topic-post-grid,
.topic-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.topic-post-card,
.featured-post-card,
.topic-mini-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--topic-border);
  border-radius: 8px;
  background: var(--topic-panel);
}

.featured-post-card {
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.1), rgba(255, 255, 255, 0.96)),
    var(--topic-panel);
}

.topic-post-card h3,
.featured-post-card h3,
.topic-mini-card h3 {
  margin: 0;
  color: var(--topic-text);
  font-size: 1.08rem;
  line-height: 1.3;
}

.topic-post-card h3 a,
.featured-post-card h3 a,
.topic-mini-card h3 a {
  color: var(--topic-text);
  text-decoration: none;
}

.topic-post-card h3 a:hover,
.featured-post-card h3 a:hover,
.topic-mini-card h3 a:hover,
.topic-post-card h3 a:focus,
.featured-post-card h3 a:focus,
.topic-mini-card h3 a:focus {
  color: var(--topic-accent);
}

.topic-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: #697586;
  font-size: 0.88rem;
  font-weight: 650;
}

.topic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.topic-tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--topic-soft);
  color: var(--topic-accent-strong);
  font-size: 0.78rem;
  font-weight: 750;
}

.topic-card-link {
  margin-top: auto;
  color: var(--topic-accent-strong);
  font-weight: 800;
  text-decoration: none;
}

.topic-hub-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 18px;
}

.topic-hub-intro > div,
.topic-subscribe-cta {
  padding: 18px;
  border: 1px solid var(--topic-border);
  border-radius: 8px;
  background: var(--topic-soft);
}

.topic-subscribe-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.topic-subscribe-cta p {
  max-width: 680px;
  margin: 0;
}

.topic-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 9px 13px;
  border: 1px solid var(--topic-accent-strong);
  border-radius: 8px;
  background: var(--topic-accent-strong);
  color: #ffffff !important;
  font-weight: 800;
  text-decoration: none;
}

.topic-button.secondary {
  background: #ffffff;
  color: var(--topic-accent-strong) !important;
}

.topic-note {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 4px solid var(--topic-accent);
}

.topic-note p {
  margin: 0;
}

@media (max-width: 760px) {
  .topic-hub-intro {
    grid-template-columns: 1fr;
  }
}