.sidebar-top-section {
  background: var(--bg-surface);
border: 0.0625rem solid var(--border);
border-radius: var(--radius-lg);
margin: 0.625rem;
width: 100%;
max-width: 18.75rem;
overflow: hidden;
}
.sidebar-top-title {
font-family: var(--font-mono);
font-size: 0.65rem;
font-weight: 500;
letter-spacing: 0.1em;
text-transform: uppercase;
color: var(--text-muted);
padding: 1rem 1rem 0 1rem;
}
.sidebar-top-title a {
color: var(--text-muted);
transition: color var(--t-fast);
}
.sidebar-top-title a:hover {
color: var(--accent);
}
.sidebar-top-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 0.5rem;
padding: 0.75rem;
}
.sidebar-top-thumbnail {
display: block;
border-radius: var(--radius-lg);
overflow: hidden;
aspect-ratio: 1 / 1;
width: 100%;
border: 0.0625rem solid var(--border);
transition: border-color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
position: relative;
}
.sidebar-top-thumbnail::after {
content: '';
position: absolute;
inset: 0;
background: linear-gradient(135deg, var(--accent-glow), transparent 60%);
opacity: 0;
transition: opacity var(--t-fast);
pointer-events: none;
z-index: 1;
}
.sidebar-top-thumbnail:hover {
border-color: var(--accent-dim);
box-shadow: 0 0 1rem var(--accent-glow);
transform: scale(1.03);
}
.sidebar-top-thumbnail:hover::after {
opacity: 1;
}
.sidebar-top-inner {
position: relative;
width: 100%;
height: 100%;
overflow: hidden;
}
.sidebar-top-inner img {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
object-fit: cover;
display: block;
transition: transform var(--t-mid);
}
.sidebar-top-thumbnail:hover .sidebar-top-inner img {
transform: scale(1.06);
}