:root {
  --hub-bg: #f2f7fd;
  --hub-surface: #ffffff;
  --hub-border: #d8e3f1;
  --hub-text: #103052;
  --hub-muted: #576f8e;
  --hub-primary: #0e539d;
  --hub-primary-dark: #0c447e;
  --hub-soft: #e9f2ff;
}

body.topic-hub-page {
  background: var(--hub-bg);
  color: var(--hub-text);
}

.topic-hub-page .hub-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.2rem 1rem 3rem;
  display: grid;
  gap: 1rem;
}

.topic-hub-page .hub-hero {
  background: linear-gradient(135deg, #113e72, #1b66ab);
  border-radius: 16px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 1.05rem;
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1.2fr 0.8fr;
}

.topic-hub-page .hub-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: #cfe5ff;
}

.topic-hub-page .hub-hero h1 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
}

.topic-hub-page .hub-hero p {
  margin: 0;
  color: #deebff;
  line-height: 1.65;
}

.topic-hub-page .hub-hero img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.32);
}

.topic-hub-page .hub-disclaimer {
  margin-top: 0.6rem;
  color: #fff4c5;
}

.topic-hub-page .hub-updated {
  margin-top: 0.55rem;
  font-size: 0.88rem;
  color: #d6e8ff;
}

.topic-hub-page .hub-guides,
.topic-hub-page .hub-newsletter,
.topic-hub-page .hub-faq {
  background: var(--hub-surface);
  border: 1px solid var(--hub-border);
  border-radius: 14px;
  padding: 1rem;
}

.topic-hub-page .hub-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.7rem;
}

.topic-hub-page .hub-head h2 {
  margin: 0;
}

.topic-hub-page .hub-head a {
  color: var(--hub-primary);
  text-decoration: none;
  font-weight: 600;
}

.topic-hub-page .hub-empty {
  border: 1px dashed #b8c8df;
  border-radius: 10px;
  color: var(--hub-muted);
  text-align: center;
  padding: 1.2rem 1rem;
}

.topic-hub-page .hub-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.topic-hub-page .hub-card {
  border: 1px solid var(--hub-border);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
}

.topic-hub-page .hub-card img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}

.topic-hub-page .hub-card-body {
  padding: 0.76rem;
}

.topic-hub-page .hub-tag {
  display: inline-block;
  padding: 0.22rem 0.5rem;
  border-radius: 999px;
  background: var(--hub-soft);
  color: var(--hub-primary);
  font-size: 0.74rem;
  font-weight: 700;
}

.topic-hub-page .hub-card-body h3 {
  margin: 0.38rem 0 0.45rem;
  line-height: 1.35;
  font-size: 0.95rem;
}

.topic-hub-page .hub-card-body h3 a {
  color: var(--hub-text);
  text-decoration: none;
}

.topic-hub-page .hub-card-body h3 a:hover {
  color: var(--hub-primary);
}

.topic-hub-page .hub-card-body p {
  margin: 0;
  color: var(--hub-muted);
  line-height: 1.55;
  font-size: 0.89rem;
}

.topic-hub-page .hub-meta {
  margin-top: 0.45rem !important;
  font-size: 0.82rem !important;
}

.topic-hub-page .hub-newsletter h2,
.topic-hub-page .hub-faq h2 {
  margin: 0 0 0.65rem;
}

.topic-hub-page .hub-newsletter-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.55rem;
}

.topic-hub-page .hub-newsletter-form input[type="email"] {
  border: 1px solid var(--hub-border);
  border-radius: 10px;
  padding: 0.68rem 0.84rem;
}

.topic-hub-page .hub-newsletter-form button {
  border: 1px solid var(--hub-primary);
  background: var(--hub-primary);
  color: #fff;
  border-radius: 10px;
  padding: 0.68rem 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.topic-hub-page .hub-newsletter-form button:hover {
  background: var(--hub-primary-dark);
}

.topic-hub-page .hub-newsletter-form label {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  font-size: 0.85rem;
  color: var(--hub-muted);
}

.topic-hub-page .hub-newsletter-form p {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.86rem;
  min-height: 1rem;
  color: var(--hub-muted);
}

.topic-hub-page .hub-newsletter-form p.error {
  color: #b42318;
}

.topic-hub-page .hub-newsletter-form p.success {
  color: #067647;
}

.topic-hub-page .hub-faq-list {
  display: grid;
  gap: 0.55rem;
}

.topic-hub-page .hub-faq-list details {
  border: 1px solid var(--hub-border);
  border-radius: 10px;
  padding: 0.62rem 0.75rem;
  background: #fff;
}

.topic-hub-page .hub-faq-list summary {
  cursor: pointer;
  font-weight: 600;
}

.topic-hub-page .hub-faq-list p {
  margin: 0.48rem 0 0;
  color: var(--hub-muted);
  line-height: 1.6;
}

@media (max-width: 980px) {
  .topic-hub-page .hub-hero {
    grid-template-columns: 1fr;
  }
  .topic-hub-page .hub-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .topic-hub-page .hub-grid,
  .topic-hub-page .hub-newsletter-form {
    grid-template-columns: 1fr;
  }
}