.nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 10px;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  padding: 22px 16px;
  text-decoration: none;
  color: white;
  min-height: 130px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.nav-item:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  color: white;
}

.nav-letter {
  font-size: 2.8em;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 10px;
  opacity: 0.9;
}

.nav-title {
  font-size: 0.75em;
  text-align: center;
  font-weight: 600;
  line-height: 1.3;
}

.nav-a { background: #7C3AED; }

.intro-blocks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.intro-block {
  border: 2px solid #e5e7eb;
  border-radius: 14px;
  padding: 24px 20px;
  text-align: left;
}

.intro-block p {
  margin: 0 0 6px 0;
  font-size: 0.85em;
  font-weight: 600;
  color: #111;
}

.intro-block small {
  display: block;
  font-size: 0.65em;
  color: #6b7280;
  margin-bottom: 14px;
}

.intro-block a {
  font-size: 0.65em;
  color: #7C3AED;
  text-decoration: none;
  border-bottom: 1px solid #7C3AED;
}
.nav-b { background: #DC2626; }
.nav-c { background: #0891B2; }
.nav-d { background: #059669; }
.nav-e { background: #D97706; }
.nav-f { background: #DB2777; }