/* Styles specific to the static per-subject SEO landing pages
   (chemistry.html, physics.html, biology.html, math.html) */

.subject-page-brand {
  text-align: center;
  margin-bottom: 8px;
  padding: 16px 0 0;
}

.subject-page-brand .brand-mark {
  display: inline-block;
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #3b82f6, #10b981);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
}

.subject-nav {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.subject-nav a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.subject-nav a:hover {
  text-decoration: underline;
}

.subject-nav-current {
  font-weight: 700;
  color: var(--text);
}

.subject-page-container {
  max-width: 800px;
}

.subject-page-hero {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 24px;
  margin-bottom: 32px;
}

.subject-page-h1 {
  font-size: 1.9rem;
  margin-bottom: 10px;
}

.subject-page-tagline {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 14px;
}

.subject-page-intro {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 14px;
}

.subject-page-meta {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 18px;
}

.subject-cta {
  display: inline-block;
  width: auto !important;
  padding: 12px 28px;
  text-decoration: none;
}

.subject-branch {
  margin-bottom: 28px;
}

.subject-branch h2 {
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 6px;
}

.branch-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.topic-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.topic-list li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
}

.topic-class-badge {
  display: inline-block;
  background: var(--bg-dark);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 4px;
}

.topic-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.subject-page-footer-cta {
  text-align: center;
  padding: 24px 0 40px;
}

.subject-page-footer-cta p {
  margin-top: 14px;
}

.subject-page-footer-cta a:not(.subject-cta) {
  color: var(--text-muted);
  font-size: 0.88rem;
  text-decoration: none;
}

.subject-page-footer-cta a:not(.subject-cta):hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .subject-nav {
    font-size: 0.78rem;
    line-height: 1.8;
  }

  .subject-page-hero {
    padding: 22px 16px;
  }

  .subject-page-h1 {
    font-size: 1.5rem;
  }
}