/* PTH Mục lục sách – Frontend styles */
.pth-mls-wrap { margin: 1.25rem 0; }
.pth-mls-toggle {
  display:flex; align-items:center; justify-content:space-between;
  width:100%; cursor:pointer; user-select:none;
  background:#f7f7f9; border:1px solid #e5e7eb; border-radius:10px;
  padding:12px 14px; font-weight:600; letter-spacing:.2px;
}
.pth-mls-toggle:hover { background:#f1f5f9; }
.pth-mls-title { margin:0; font-size:16px; }
.pth-mls-icon { transition:transform .2s ease; display:inline-flex; }
.pth-mls-content {
  border:1px solid #e5e7eb; border-top:none; border-radius:0 0 10px 10px;
  padding:14px; display:none; background:#fff; overflow:hidden;
}
.pth-mls-content-inner { max-height:60vh; overflow:auto; }
.pth-mls-wrap.is-open .pth-mls-content { display:block; }
.pth-mls-wrap.is-open .pth-mls-toggle .pth-mls-icon { transform: rotate(180deg); }
.pth-mls-note { font-size:12px; color:#64748b; margin-top:.5rem; }
@media (prefers-color-scheme: dark){
 .pth-mls-toggle{ background:#111827; border-color:#374151; color:#e5e7eb;}
 .pth-mls-content{ background:#0b0f17; border-color:#374151; color:#e5e7eb;}
}