/* Global look */
body {
  background: radial-gradient(circle at top left, #f9fbff 0, #ffffff 40%, #fdf7ff 100%);
}

main.content {
  max-width: 1100px;
}

/* Navbar accent */
.navbar {
  background: linear-gradient(90deg, #3b82f6, #8b5cf6);
}

.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: #ffffffdd;
  border-radius: 14px;
  padding: 1.3rem 1.4rem;
  border: 1px solid #e5e7eb;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.05);
  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: #1f2937;
}

.module-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: #4b5563;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 35px rgba(15, 23, 42, 0.12);
  border-color: #3b82f6;
}

.author-card {
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 2px solid transparent;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 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: #007bff;
  box-shadow: 0 12px 25px rgba(0,123,255,0.2);
}

.author-title {
  color: #495057;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0.5rem 0;
  padding: 0.5rem;
  background: rgba(0,123,255,0.1);
  border-radius: 8px;
  border-left: 4px solid #007bff;
}

.author-links {
  margin-top: 1rem;
  padding: 0.75rem;
  background: rgba(0,0,0,0.05);
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.author-links a {
  color: #007bff;
  text-decoration: none;
  transition: color 0.3s ease;
}

.author-links a:hover {
  color: #0056b3;
  text-decoration: underline;
}

/* Callouts a bit more vibrant */
.callout-note {
  border-left-color: #3b82f6;
}

.callout-tip {
  border-left-color: #10b981;
}

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

.callout-important {
  border-left: 4px solid #dc3545 !important;
  background: linear-gradient(135deg, #fff5f5 0%, #ffe3e3 100%) !important;
  animation: slideInLeft 0.6s ease-out;
}

.callout-important h3 {
  color: #dc3545 !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);
  }
}