.sidebar{background:var(--card);border-radius:16px;box-shadow:0 4px 12px rgba(0,0,0,.04);margin-bottom:1.5rem;padding:1.5rem}.sidebar-title{border-bottom:2px solid var(--border);color:var(--accent);font-size:18px;font-weight:600;margin-bottom:1rem;padding-bottom:.5rem}.sidebar-content{color:var(--muted);font-size:14px;line-height:1.6}.sidebar-list{list-style:none;margin:0;padding:0}.sidebar-list li{border-bottom:1px solid var(--border);padding:.5rem 0}.sidebar-list li:last-child{border-bottom:none}.sidebar-list a{color:var(--accent);text-decoration:none;transition:color .2s ease}.sidebar-list a:hover{color:var(--muted)}.ad-placeholder{align-items:center;background:#f0f0f0;border:2px dashed #ccc;border-radius:8px;color:#999;display:flex;font-size:14px;justify-content:center;min-height:250px;padding:2rem 1rem;text-align:center}@media (max-width:991px){.sidebar{margin-top:2rem}}@media (max-width:768px){.sidebar{margin-top:1.5rem}}