:root { --blue:#245bd6; --ink:#16202e; --muted:#5b6573; --rule:#dfe4eb; }
body { background:#f8f9fb; }
.library-topbar,.library,.detail,.library-footer { max-width:1120px; margin-inline:auto; }
.library-topbar { display:flex; align-items:center; justify-content:space-between; padding:24px 4px; gap:16px; }
.brand { font-size:17px; font-weight:700; }
.brand span,.return-link { font-size:13px; color:var(--muted); font-weight:400; }
.return-link { min-height:44px; display:flex; align-items:center; }
.library,.detail { padding:40px 44px 48px; background:white; border:1px solid #e3e7eb; border-radius:16px; }
.eyebrow { color:var(--blue); font-size:13px; margin-bottom:12px; }
.library-intro h1 { font-size:34px; letter-spacing:.02em; margin-bottom:14px; }
.intro-text { font-size:16px; color:#424b55; }
.privacy-note { color:var(--muted); font-size:12px; margin-top:8px; }
.category-nav { position:sticky; top:0; z-index:5; display:flex; flex-wrap:wrap; gap:8px; margin-top:28px; border-bottom:1px solid var(--rule); padding:14px 0; background:white; }
.category-nav a { display:flex; align-items:center; gap:12px; min-height:44px; padding:8px 15px; background:#f5f7fa; border-radius:5px; font-size:14px; }
.category-nav a:hover { background:#eaf3fa; text-decoration:none; }
.category-nav span { color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
.library-section { margin-top:40px; scroll-margin-top:94px; }
.section-intro { margin-bottom:20px; }
.section-intro h2 { border:0; padding:0; margin:0 0 5px; font-size:22px; }
.section-intro p { font-size:13px; color:var(--muted); }
.material-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px; }
.material-card { border:1px solid var(--rule); border-radius:10px; overflow:hidden; display:flex; flex-direction:column; transition:border-color .18s,box-shadow .18s; color:var(--ink); }
.material-card:hover { border-color:#8daae2; box-shadow:0 5px 16px #245bd60a; color:var(--ink); text-decoration:none; }
.material-card:focus-visible { outline-offset:3px; }
.card-preview { height:175px; padding:14px; background:#f6f8fa; border-bottom:1px solid #e7ebef; }
.card-preview img { display:block; width:100%; height:100%; object-fit:contain; }
.card-copy { padding:18px; flex:1; display:flex; flex-direction:column; align-items:flex-start; }
.badge { display:inline-block; font-size:12px; color:#2356af; background:#eef3fc; border-radius:4px; padding:3px 8px; line-height:1.6; }
.card-copy h3 { font-size:16px; line-height:1.6; margin:12px 0 8px; }
.card-copy p { color:var(--muted); font-size:13px; line-height:1.75; margin-bottom:18px; }
.card-action { color:var(--blue); font-size:13px; margin-top:auto; display:flex; width:100%; justify-content:space-between; gap:10px; }
.papers .badge { color:#475e75; background:#f0f3f6; }
.papers .card-copy { padding:22px; }
#papers .material-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
#projects .material-grid { grid-template-columns:minmax(0,1fr); }
.projects.material-card { display:grid; grid-template-columns:220px minmax(0,1fr); }
.projects .card-preview { height:100%; border-bottom:0; border-right:1px solid #e7ebef; }
.library-footer { padding:24px 4px 40px; color:var(--muted); font-size:12px; display:flex; justify-content:space-between; gap:12px; }
.breadcrumbs { display:flex; flex-wrap:wrap; gap:12px; color:var(--muted); font-size:13px; margin-bottom:24px; }
.breadcrumbs a { min-height:32px; display:flex; align-items:center; }
.breadcrumbs span { align-self:center; }
.detail-intro h1 { font-size:29px; letter-spacing:0; line-height:1.5; margin:16px 0 12px; }
.detail-intro p { color:#505b66; }
.detail-note { font-size:13px; color:var(--muted); }
.related-link { display:block; margin-top:18px; font-size:14px; color:var(--blue); }
.document-section { margin-top:36px; }
.document-section h2 { font-size:20px; }
.document-actions { display:flex; align-items:center; flex-wrap:wrap; gap:10px; }
.primary-link { background:var(--blue); border-color:var(--blue); color:white; }
.primary-link:hover { background:#194cbb; color:white; }
.file-info { font-size:12px; color:var(--muted); }
.preview-note { font-size:12px; color:var(--muted); margin:12px 0 20px; }
.document-preview { margin:22px 0; }
.document-preview a { display:block; padding:12px; background:#f6f8fa; border:1px solid #e3e7eb; }
.document-preview img { width:100%; max-height:none; height:auto; display:block; object-fit:contain; }
.document-preview figcaption { color:var(--muted); font-size:12px; margin-top:7px; text-align:center; }
.detail-bottom { margin-top:40px; }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0; }
@media(max-width:1120px) {
 .library-topbar,.library-footer { margin-inline:24px; }
 .library,.detail { margin-inline:24px; padding:34px; }
 .material-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .library-section { scroll-margin-top:146px; }
}
@media(max-width:640px) {
 .library-topbar { margin:0; padding:12px 20px; border-bottom:1px solid var(--rule); }
 .brand { font-size:16px; }
 .brand span { display:none; }
 .library,.detail { margin:0; padding:28px 20px 34px; border:0; border-radius:0; }
 .library-section { scroll-margin-top:198px; }
 .library-intro h1 { font-size:28px; }
 .intro-text { font-size:14px; }
 .category-nav { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); }
 .category-nav a { justify-content:space-between; }
 .material-grid,#papers .material-grid { grid-template-columns:minmax(0,1fr); }
 .material-card { display:grid; grid-template-columns:100px minmax(0,1fr); align-items:stretch; }
 .projects.material-card { grid-template-columns:100px minmax(0,1fr); }
 .card-preview { height:100%; padding:8px; border:0; border-right:1px solid #e7ebef; }
 .card-copy { padding:15px; }
 .card-copy h3 { font-size:15px; margin:10px 0 7px; }
 .card-copy p { font-size:12px; margin-bottom:12px; }
 .papers { display:flex; }
 .papers .card-copy { padding:20px; }
 .library-footer { margin-inline:20px; font-size:11px; }
 .detail-intro h1 { font-size:25px; }
 .document-preview a { padding:3px; }
 .document-section h2 { font-size:18px; }
 .file-info { width:100%; }
}
@media(prefers-reduced-motion:reduce) { .material-card { transition:none; } }