/* BrightNote · Teacher add-ons (lesson side) */
.bnt{margin:14px 0;border:1.5px solid #d9c9f0;border-radius:16px;background:linear-gradient(180deg,#fbf9ff,#fff);padding:14px 16px;box-shadow:0 4px 14px rgba(124,92,255,.06)}
.bnt-head{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.bnt-badge{font-size:10.5px;font-weight:900;text-transform:uppercase;letter-spacing:.06em;color:#6a4bd0;background:#efe9ff;border-radius:20px;padding:3px 9px}
.bnt-title{font-weight:900;color:#3a2b6b;font-size:16px;margin:2px 0 3px}
.bnt-note{font-size:13.5px;font-weight:700;color:#4a4560;line-height:1.5;margin:4px 0}
.bnt-bar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:10px 0 4px}
.bnt-play{background:#6a4bd0;color:#fff;border:0;border-radius:11px;font-family:inherit;font-weight:900;font-size:14px;padding:9px 16px;cursor:pointer;box-shadow:0 3px 0 #4a338f}
.bnt-play:active{transform:translateY(2px);box-shadow:none}
.bnt-t,.bnt-c{font-size:12.5px;font-weight:800;color:#5a5470;display:inline-flex;align-items:center;gap:6px}
.bnt-t input{width:96px}
.bnt-ntn{background:#fff;border:1px solid #ece7f6;border-radius:12px;margin-top:8px;overflow-x:auto;min-height:44px}
.bnt-load{font-size:12px;color:#9a93b0;font-weight:700;padding:10px;display:inline-block}