.k12-wrap{max-width:1080px;margin:0 auto;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1f2937}
.k12-h{font-size:1.6rem;margin:.6em 0;color:#0f3460}
.k12-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.k12-card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:18px;box-shadow:0 4px 14px rgba(15,52,96,.06);margin-bottom:16px}
.k12-card h4{margin:0 0 .5em}
.k12-muted{color:#6b7280}
.k12-btn{display:inline-block;background:#0f3460;color:#fff!important;padding:9px 16px;border-radius:10px;text-decoration:none;border:0;cursor:pointer;font-size:.95rem}
.k12-btn:hover{background:#13447c}
.k12-btn-live{background:#e94560}
.k12-btn-live:hover{background:#d63651}
.k12-link{color:#0f3460;text-decoration:underline}
.k12-lesson-row{display:flex;align-items:center;gap:10px;padding:6px 0;border-bottom:1px solid #f1f5f9}
.k12-video{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:12px;margin:12px 0}
.k12-video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0;border-radius:12px}
.k12-table{width:100%;border-collapse:collapse;margin:10px 0}
.k12-table th,.k12-table td{text-align:left;padding:8px 10px;border-bottom:1px solid #eef2f7}
.k12-timetable{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}
.k12-day{background:#f8fafc;border:1px solid #e5e7eb;border-radius:12px;padding:10px;min-height:90px}
.k12-day h4{margin:0 0 .5em;color:#0f3460}
.k12-slot{background:#fff;border-radius:8px;padding:6px 8px;margin-bottom:6px;font-size:.85rem;border:1px solid #eef2f7}
.k12-quiz .k12-q{margin:12px 0;padding:12px;background:#f8fafc;border-radius:10px}
.k12-opt{display:block;padding:4px 0;cursor:pointer}
.k12-input{padding:8px;border:1px solid #cbd5e1;border-radius:8px;width:100%;max-width:320px}
.k12-result{font-weight:600;padding:10px;border-radius:10px}
.k12-pass{background:#dcfce7;color:#166534}
.k12-fail{background:#fee2e2;color:#991b1b}