/* SA2 v4.5 — section concept-check and mastery layer */
.kb-mastery-check{scroll-margin-top:110px;margin:30px 0 10px;border:1px solid #c9d7e5;border-radius:18px;background:linear-gradient(180deg,#f8fbff 0%,#fff 100%);box-shadow:0 8px 24px rgba(24,50,77,.07);overflow:hidden}
.kb-mastery-head{display:flex;gap:18px;align-items:flex-start;justify-content:space-between;padding:20px 22px;border-bottom:1px solid #d9e4ef;background:linear-gradient(90deg,#eef6ff,#fffaf0)}
.kb-mastery-kicker{font-size:11px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:#8a6518;margin-bottom:5px}
.kb-mastery-head h3{margin:0 0 6px;font-size:21px;color:#17324d}.kb-mastery-head p{margin:0;color:#5a6978;max-width:760px;font-size:14px;line-height:1.55}
.kb-mastery-status{min-width:152px;text-align:center;border:1px solid #b9c9d8;border-radius:999px;background:#fff;padding:9px 13px;font-size:12px;font-weight:800;color:#425a70}
.kb-mastery-status.mastered{background:#e8f7ef;border-color:#9dcdb3;color:#1c6841}.kb-mastery-status.supported{background:#fff7da;border-color:#e5ca74;color:#72570f}.kb-mastery-status.progress{background:#edf5fd;border-color:#a9c7e4;color:#244e73}
.kb-mastery-body{padding:18px 22px 22px}.kb-master-question{border:1px solid #d9e2ea;background:#fff;border-radius:14px;padding:15px 16px;margin:12px 0}.kb-master-question h4{margin:0 0 6px;color:#18324d;font-size:15px;line-height:1.45}.kb-master-meta{font-size:12px;color:#6a7886;margin-bottom:10px}
.kb-master-option{display:block;width:100%;text-align:left;border:1px solid #cad5df;background:#fff;border-radius:10px;padding:10px 12px;margin:7px 0;color:#243b52;cursor:pointer;line-height:1.4}.kb-master-option:hover:not(:disabled){border-color:#8fb1cf;background:#f6faff}.kb-master-option.correct{border-color:#58a078;background:#e9f7ef}.kb-master-option.wrong{border-color:#d7848e;background:#fff0f2}.kb-master-option:disabled{cursor:default;opacity:.9}
.kb-master-feedback,.kb-master-support{margin-top:9px;padding:10px 12px;border-radius:10px;font-size:13px;line-height:1.5}.kb-master-feedback{background:#eaf7f0;border:1px solid #acd3bd;color:#205a3b}.kb-master-support.cue{background:#fff8de;border:1px solid #ecd992;color:#574713}.kb-master-support.full{background:#edf5fd;border:1px solid #bcd3eb;color:#18324d}.kb-master-support.reveal{background:#fff0f2;border:1px solid #efb8c0;color:#6d2732}
.kb-mastery-summary{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:14px;padding-top:14px;border-top:1px dashed #cbd8e3;font-size:13px;color:#4c6074}.kb-mastery-summary strong{color:#18324d}.kb-mastery-note{font-size:12px;color:#647483;margin-top:8px;line-height:1.45}
.kb-master-badge{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:5px 9px;background:#f1f5f9;border:1px solid #d8e0e7;font-size:11px;font-weight:700}
@media(max-width:720px){.kb-mastery-head{display:block}.kb-mastery-status{display:inline-block;margin-top:12px;min-width:0}.kb-mastery-body{padding:14px}.kb-master-question{padding:13px}.kb-master-option{padding:11px}}