/* Platform Directory Section */
.core-nav-section {
    background: #f9f9f9; /* Matches Top Pair card background */
    padding: 2rem 1rem;
    border-radius: 8px;
}

.core-nav-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.75rem; /* Tighter spacing */
    max-width: 900px;
    margin: 0 auto;
}

.core-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: transform 0.2s ease;
    padding: 0.5rem;
}

.core-nav-item:hover { 
    transform: translateY(-2px); 
}

/* Individual white square around each thumbnail */
.core-nav-thumbnail {
    width: 56px;
    height: 56px;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    overflow: hidden;
    background: #ffffff; /* White square */
    border: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

.core-nav-thumbnail img {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: 4px;
}

.core-nav-title {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.3;
    color: #333;
}

.core-nav-item:hover .core-nav-title { color: #0073aa; }

/* Responsive Breakpoints */
@media (max-width: 900px) {
    .core-nav-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 600px) {
    .core-nav-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 400px) {
    .core-nav-grid { grid-template-columns: repeat(2, 1fr); }
}