:root {
  --syllabus-card-bg: #ffffff;
  --syllabus-card-border: #e2e8f0;
  --syllabus-muted: #64748b;
}

.mobile-top-links {
  display: none;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
}

.mobile-top-links a {
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--foreground);
  background: #eff6ff;
  border: 1px solid #dbeafe;
  border-radius: 999px;
  padding: 0.28rem 0.6rem;
  white-space: nowrap;
  transition: 0.2s ease;
}

.mobile-top-links a:hover {
  background: #dbeafe;
  color: var(--primary);
}

.main nav[aria-label="Breadcrumb"] {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 1.5rem 0 1rem;
}

.main nav[aria-label="Breadcrumb"] a {
  color: var(--foreground);
  text-decoration: none;
  font-weight: 600;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  transition: 0.2s ease;
}

.main nav[aria-label="Breadcrumb"] a:hover {
  color: var(--primary);
  background: #dbeafe;
}

.syllabus-hero {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: stretch;
  background: #ffffff;
  border: 1px solid var(--syllabus-card-border);
  border-radius: 1.25rem;
  padding: 1.75rem;
  margin-bottom: 2rem;
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.syllabus-hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.65rem;
}

.syllabus-hero p {
  color: var(--syllabus-muted);
  line-height: 1.6;
  max-width: 48rem;
}

.hero-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--foreground);
  font-size: 0.85rem;
  font-weight: 600;
}

.hero-card {
  border: 1px solid var(--syllabus-card-border);
  background: #f8fafc;
  border-radius: 1rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.hero-card-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.hero-card-sub {
  color: var(--syllabus-muted);
  font-size: 0.9rem;
}

.syllabus-section {
  margin-bottom: 2.5rem;
}

.syllabus-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.syllabus-section h3 {
  font-size: 1.1rem;
  margin: 1.25rem 0 0.75rem;
  color: var(--foreground);
}

.syllabus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.syllabus-card {
  border: 1px solid var(--syllabus-card-border);
  background: var(--syllabus-card-bg);
  border-radius: 1rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.syllabus-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.12);
}

.card-meta {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--syllabus-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--foreground);
}

.card-title i,
.hero-card-title i {
  margin-right: 0.45rem;
  color: var(--primary);
}

.card-sub {
  color: var(--syllabus-muted);
  font-size: 0.85rem;
}

.syllabus-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pyq-btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.subject-card {
  border: 1px solid var(--syllabus-card-border);
  border-radius: 0.85rem;
  padding: 0.85rem 1rem;
  background: #ffffff;
  text-decoration: none;
  color: var(--foreground);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.subject-card:hover {
  border-color: #cbd5f5;
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.1);
}

.subject-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
}

body.dark-mode {
  --syllabus-card-bg: #0f172a;
  --syllabus-card-border: #1f2937;
  --syllabus-muted: #9ca3af;
}

body.dark-mode .syllabus-hero,
body.dark-mode .syllabus-card,
body.dark-mode .subject-card {
  background: #0b1220;
}

body.dark-mode .hero-card {
  background: #0f172a;
}

body.dark-mode .subject-card:hover {
  border-color: #334155;
}

/* hero-meta styling for dark mode */
body.dark-mode .hero-meta {
  color: #1f2937; /* dark text for readability */
  background: var(--primary); /* light-blue background similar to download buttons */
}

@media (max-width: 900px) {
  .syllabus-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-top-links {
    display: inline-flex;
  }
}

@media (max-width: 600px) {
  .syllabus-hero {
    padding: 1.25rem;
  }

  .syllabus-hero h1 {
    font-size: 1.8rem;
  }

  .mobile-top-links a {
    font-size: 0.72rem;
    padding: 0.24rem 0.52rem;
  }
}