/* Library uses the same frame, controls and surfaces as the duel workspace. */
#problem-bank { width:100%; margin:0; }
.bank-heading { display:flex; justify-content:space-between; align-items:center; gap:24px; }
.bank-heading .muted { font-size:14px; margin:8px 0 0; }
.library-layout { display:grid; grid-template-columns:224px minmax(0,1fr); gap:32px; border-top:1px solid var(--line); padding-top:24px; }
.library-topics { display:flex; flex-direction:column; gap:4px; align-self:start; position:sticky; top:100px; }
.library-topics button { width:100%; justify-content:space-between; height:auto; min-height:44px; padding:10px 12px; background:transparent; border-color:transparent; font-size:13px; text-align:left; white-space:normal; }
.library-topics button[aria-pressed="true"] { background:var(--overlay); color:var(--text); }
.topic-count { color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.library-collection { min-width:0; }
.library-toolbar { display:flex; align-items:center; justify-content:space-between; gap:24px; margin-bottom:24px; }
.library-toolbar h2 { margin:0; font-size:20px; }
#bank-count { margin:4px 0 0; }
.library-search { position:relative; width:300px; max-width:100%; }
.library-search svg { position:absolute; width:18px; height:18px; left:12px; top:12px; stroke:var(--muted); stroke-width:1.7; }
.library-search input { padding-left:38px; background:var(--surface); }
.library-group { margin-bottom:28px; }
.bank-group-heading { display:flex; justify-content:space-between; align-items:center; gap:16px; font-size:14px; margin:0 0 4px; font-weight:600; color:var(--muted); }

.bank-seen { color:var(--foam); font-size:11px; margin-top:auto; }

.library-note { margin:24px 0 0; font-size:12px; color:var(--muted); max-width:75ch; }
.library-empty { padding:40px 24px; border:1px dashed var(--line); border-radius:var(--radius-surface); text-align:center; }
.library-empty p { color:var(--muted); margin:0; font-size:14px; }
@media(max-width:900px) { .library-layout { grid-template-columns:180px minmax(0,1fr); gap:24px; } }
@media(max-width:720px) {
 .bank-heading { align-items:flex-start; gap:12px; }
 .bank-heading .file-button { padding:8px 10px; font-size:12px; }
 .library-layout { display:block; padding-top:16px; }
 .library-topics { position:static; flex-direction:row; overflow:auto; padding-bottom:16px; margin-bottom:8px; scrollbar-width:thin; }
 .library-topics button { flex:0 0 auto; width:auto; white-space:nowrap; gap:12px; }
 .library-toolbar { align-items:flex-start; flex-direction:column; gap:16px; margin-bottom:20px; }
 .library-search { width:100%; }
 .library-search svg { top:14px; }
}

.library-more { margin:0; font-size:12px; padding:6px 8px; min-height:32px; height:32px; }
.library-pagination { display:flex; align-items:center; justify-content:center; gap:16px; margin-top:24px; }
.library-pagination span { font-size:12px; color:var(--muted); }