/* Global look */
body {
  background: #020617; /* very dark navy/charcoal */
  color: #e5e7eb;      /* light gray text for contrast */
}

main.content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem 2.5rem;
}

/* Navbar accent */
.navbar {
  background: linear-gradient(90deg, #020617, #101585);
}

/* Primary buttons for CTAs */
.btn-primary {
  background-color: #101585;
  border-color: #101585;
}

.btn-primary:hover {
  background-color: #050a30;
  border-color: #050a30;
}

.btn-outline-secondary {
  color: #374151;
  border-color: #6b7280;
}

.btn-outline-secondary:hover {
  color: #111827;
  background-color: #e5e7eb;
  border-color: #4b5563;
}

.navbar .navbar-brand, .navbar .nav-link, .navbar .navbar-nav .nav-link {
  color: #f9fafb !important;
}

.navbar .nav-link:hover {
  color: #e5e7eb !important;
}

/* Module cards on index */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.module-card {
  background: #020617;
  border-radius: 14px;
  padding: 1.3rem 1.4rem;
  border: 1px solid #1f2937;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(6px);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  animation: fadeInUp 0.4s ease both;
}

.module-card h3 {
  margin-top: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: #e5e7eb;
}

.module-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: #d1d5db;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.7);
  border-color: #101585;
}

.author-card {
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 2px solid transparent;
  background: linear-gradient(135deg, #020617 0%, #020617 100%);
  position: relative;
  overflow: hidden;
}

.author-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: left 0.6s ease;
}

.author-card:hover::before {
  left: 100%;
}

.author-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: #101585;
  box-shadow: 0 12px 25px rgba(15, 23, 42, 0.25);
}

.author-title {
  color: #e5e7eb;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0.5rem 0;
  padding: 0.5rem;
  background: rgba(15, 23, 42, 0.85);
  border-radius: 8px;
  border-left: 4px solid #101585;
}

.author-links {
  margin-top: 1rem;
  padding: 0.75rem;
  background: rgba(15,23,42,0.85);
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.author-links a {
  color: #7b523c;
  text-decoration: none;
  transition: color 0.3s ease;
}

.author-links a:hover {
  color: #503222;
  text-decoration: underline;
}

/* Callouts a bit more vibrant */
.callout-note {
  border-left-color: #38bdf8;
}

.callout-tip {
  border-left-color: #22c55e;
}

.callout-warning {
  border-left-color: #f97316;
}

.callout-important {
  border-left: 4px solid #f97373 !important;
  background: linear-gradient(135deg, #450a0a 0%, #7f1d1d 100%) !important;
  animation: slideInLeft 0.6s ease-out;
}

.callout-important h3 {
  color: #fecaca !important;
  font-weight: 700;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}