#sidebar {
  width: 300px; border-right: 1px solid var(--border); padding: 14px 10px;
  overflow-y: auto; flex-shrink: 0; background: var(--surface);
}

/* ── Filter columns (Language + Topic side by side) ── */
.filter-columns { display: flex; gap: 0; max-height: 340px; }
.filter-col     { flex: 1; min-width: 0; overflow-y: auto; }
.filter-divider { width: 1px; background: var(--border); margin: 0 8px; flex-shrink: 0; }
.sidebar-label  { font-size: 10px; color: var(--text4); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 10px; padding-left: 4px; }

/* ── Filter list items ── */
.lang-item {
  display: flex; align-items: center; gap: 8px; padding: 5px 8px;
  border-radius: 5px; cursor: pointer; margin-bottom: 1px;
  border: 1px solid transparent; transition: all 0.12s;
}
.lang-item:hover            { background: #1c2128; }
.lang-item.active           { background: #1c2128; border-color: #2d333b; }
.lang-item.active .lang-name { color: var(--text); }
.lang-dot   { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
.lang-name  { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; color: var(--text2); }
.lang-count { color: var(--text4); font-size: 10px; flex-shrink: 0; }

#topic-list .lang-item    { padding: 5px 6px; }
#topic-list .lang-name    { font-size: 11px; }
.topic-placeholder        { font-size: 11px; color: var(--text4); padding: 6px 4px; line-height: 1.5; }

/* ── Active filter chips (float over canvas) ── */
#active-filters         { position: absolute; top: 12px; left: 12px; display: flex; flex-direction: column; gap: 5px; pointer-events: none; z-index: 10; }
#active-filters > div   { pointer-events: auto; }
.active-chip            { display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px 4px 10px; background: #0d1117cc; border: 1px solid #2d4a7a; backdrop-filter: blur(4px); border-radius: 20px; font-size: 11px; color: var(--accent); box-shadow: 0 2px 8px rgba(0,0,0,0.4); }
.active-chip-name       { white-space: nowrap; max-width: 160px; overflow: hidden; text-overflow: ellipsis; }
.active-chip-clear      { cursor: pointer; color: var(--text3); font-size: 14px; line-height: 1; }
.active-chip-clear:hover { color: var(--text); }

/* ── Display toggles ── */
.toggle-row   { display: flex; align-items: center; justify-content: space-between; padding: 5px 4px; cursor: pointer; }
.toggle-label { font-size: 12px; color: var(--text2); }
.toggle-row input { display: none; }
.toggle-track { position: relative; width: 28px; height: 16px; background: var(--border3); border-radius: 8px; transition: background 0.15s; flex-shrink: 0; }
.toggle-thumb { position: absolute; top: 2px; left: 2px; width: 12px; height: 12px; background: var(--text3); border-radius: 50%; transition: left 0.15s, background 0.15s; }
.toggle-row input:checked ~ .toggle-track              { background: var(--green); }
.toggle-row input:checked ~ .toggle-track .toggle-thumb { left: 14px; background: #fff; }

/* ── Stats block ── */
.stats-block { margin-top: 24px; border-top: 1px solid var(--border); padding-top: 14px; }
.stat-row    { display: flex; justify-content: space-between; padding: 4px; font-size: 12px; }
.stat-label  { color: var(--text4); }
.stat-val    { color: var(--text2); font-weight: 600; }
.btn-clear   { width: 100%; margin-top: 10px; padding: 6px; background: transparent; border: 1px solid var(--border3); border-radius: 5px; color: var(--text3); cursor: pointer; font-family: inherit; font-size: 11px; }