/* Chapter-lesson cards only; no changes to existing Gia Sư or Học Sinh layouts. */
.gssv-m12-merged{border:1px solid #c9dce9;border-radius:16px;padding:18px;background:#f7fbff;margin:16px 0 22px}
.gssv-m12-merged-head h2{font-size:1.28rem;margin:5px 0 9px;color:#153b63}
.gssv-m12-eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.06em;color:#28649a;margin:0}
.gssv-m12-source-note{font-size:.86rem;color:#385874;margin:9px 0}
.gssv-m12-lessons{display:grid;grid-template-columns:repeat(auto-fit,minmax(275px,1fr));gap:10px;margin-top:18px}
.gssv-m12-lesson{background:#fff;padding:14px;border-radius:12px;border:1px solid #d8e5ed;display:flex;flex-direction:column;justify-content:space-between;gap:12px}
.gssv-m12-lesson h3{font-size:1rem;margin:0 0 5px;color:#183d57}
.gssv-m12-lesson p{margin:0;font-size:.84rem;color:#486178}
.gssv-m12-actions{display:flex;gap:7px;flex-wrap:wrap;align-items:center}
.gssv-m12-actions button{font-size:.86rem;min-height:38px;flex:1 1 auto}
.gssv-m12-unavailable{color:#6a7e91;font-size:.81rem}
@media(max-width:600px){.gssv-m12-merged{padding:11px;border-radius:10px}.gssv-m12-lessons{display:block}.gssv-m12-lesson{margin:9px 0}}