.lesson-reader-open{overflow:hidden}.lesson-reader-shell[hidden]{display:none}.lesson-reader-shell{position:fixed;inset:0;z-index:10020}.lesson-reader-backdrop{position:absolute;inset:0;background:rgba(2,6,23,.82);backdrop-filter:blur(12px)}.lesson-reader{position:absolute;inset:2vh 2vw;display:grid;grid-template-rows:auto auto 1fr auto;overflow:hidden;border-radius:26px;background:linear-gradient(145deg,#07111f,#0f1d31);border:1px solid rgba(148,163,184,.22);box-shadow:0 40px 100px rgba(0,0,0,.5);color:#eaf2ff}.lesson-reader-top{display:flex;justify-content:space-between;gap:1rem;align-items:flex-start;padding:1.1rem 1.25rem;border-bottom:1px solid rgba(148,163,184,.14)}.lesson-reader-top h2{margin:.2rem 0 .25rem;font-size:clamp(1.35rem,2.7vw,2.4rem);line-height:1.05}.lesson-reader-top p{margin:0;color:#9fb1ca}.lesson-reader-eyebrow{font-size:.75rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:#93c5fd}.lesson-reader-actions{display:flex;gap:.55rem;flex-wrap:wrap;justify-content:flex-end}.lesson-reader-actions button,.lesson-reader-footer button,.lesson-reader-nav button{border:1px solid rgba(147,197,253,.25);background:rgba(30,41,59,.78);color:#e8f1ff;border-radius:12px;padding:.58rem .8rem;font-weight:800;cursor:pointer}.lesson-reader-actions [data-close-lesson]{font-size:1.2rem;min-width:42px}.lesson-reader-nav{display:flex;gap:.45rem;overflow:auto;padding:.7rem 1.1rem;border-bottom:1px solid rgba(148,163,184,.12);background:rgba(15,23,42,.54)}.lesson-reader-nav button{white-space:nowrap;padding:.5rem .72rem;border-radius:999px;font-size:.78rem}.lesson-reader-body{overflow:auto;padding:1.2rem;scroll-behavior:smooth}.lesson-reader-section{max-width:1050px;margin:0 auto 1.1rem;padding:clamp(1rem,2vw,1.45rem);border-radius:22px;background:rgba(15,23,42,.72);border:1px solid rgba(148,163,184,.15)}.lesson-reader-section h3{margin:0 0 .9rem;font-size:1.25rem;color:#f8fbff}.lesson-reader-section h4{margin:.95rem 0 .45rem;color:#dbeafe}.lesson-reader-section p,.lesson-reader-section li{line-height:1.62;color:#cbd8ea}.lesson-lead{font-size:1.03rem}.lesson-focus-box{margin:.8rem 0;padding:.9rem 1rem;border-left:4px solid #60a5fa;border-radius:14px;background:rgba(37,99,235,.09)}.lesson-focus-box p{margin:.25rem 0 0}.keyword-grid{display:flex;gap:.5rem;flex-wrap:wrap}.keyword-grid span{padding:.48rem .68rem;border-radius:999px;background:rgba(59,130,246,.12);border:1px solid rgba(96,165,250,.17);color:#bfdbfe;font-weight:800;font-size:.78rem}.teaching-chunk{padding:1rem;margin:.75rem 0;border-radius:18px;background:rgba(30,41,59,.58);border:1px solid rgba(148,163,184,.12)}.teaching-chunk>span{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;font-weight:900;color:#93c5fd}.teaching-chunk h4{margin:.25rem 0 .5rem}.teaching-chunk p{margin:.4rem 0}.equation-table-wrap{overflow:auto}.equation-table{width:100%;border-collapse:collapse;min-width:680px}.equation-table th,.equation-table td{text-align:left;padding:.72rem;border-bottom:1px solid rgba(148,163,184,.12);vertical-align:top}.equation-table th{color:#dbeafe}.equation-table td{color:#bdcbe0}.equation-table code{display:inline-block;padding:.32rem .5rem;border-radius:9px;background:#020617;color:#dbeafe;font-size:.95rem}.worked-example{padding:1rem;border-radius:18px;background:linear-gradient(135deg,rgba(37,99,235,.13),rgba(124,58,237,.11));border:1px solid rgba(147,197,253,.17)}.worked-example ol{padding-left:1.2rem}.misconception-list{display:grid;gap:.55rem}.misconception-list p{margin:0;padding:.7rem .8rem;border-radius:14px;background:rgba(245,158,11,.08);border:1px solid rgba(245,158,11,.15)}.question-list{display:grid;gap:.9rem;padding-left:1.35rem}.question-list textarea,.exam-list textarea{width:100%;box-sizing:border-box;margin-top:.5rem;padding:.7rem;border-radius:12px;border:1px solid rgba(148,163,184,.2);background:rgba(2,6,23,.5);color:#f8fbff;resize:vertical}.exam-list{display:grid;gap:.8rem}.exam-list article{padding:.95rem;border-radius:16px;background:rgba(30,41,59,.58);border:1px solid rgba(148,163,184,.12)}.exam-list article>span{float:right;padding:.28rem .48rem;border-radius:999px;background:rgba(167,139,250,.13);color:#c4b5fd;font-size:.72rem;font-weight:900}.exam-list p{margin:.1rem 3rem .4rem 0}.lesson-reader-footer{display:flex;justify-content:space-between;align-items:center;gap:.75rem;padding:.75rem 1.1rem;border-top:1px solid rgba(148,163,184,.14);background:rgba(2,6,23,.44)}.lesson-reader-footer span{font-size:.78rem;color:#9fb1ca}.lesson-reader-footer button:disabled{opacity:.35;cursor:not-allowed}.curriculum-lesson[data-content-ready="1"]{cursor:pointer}.curriculum-lesson[data-content-ready="1"]:focus{outline:2px solid #60a5fa;outline-offset:-2px}.lesson-content-ready{background:rgba(16,185,129,.12)!important;color:#6ee7b7!important}.curriculum-lesson:hover .lesson-content-ready{background:rgba(16,185,129,.2)!important}@media(max-width:760px){.lesson-reader{inset:0;border-radius:0}.lesson-reader-top{padding:.85rem;flex-direction:column}.lesson-reader-actions{width:100%;justify-content:space-between}.lesson-reader-nav{padding:.55rem .7rem}.lesson-reader-body{padding:.7rem}.lesson-reader-section{border-radius:16px;padding:.9rem}.lesson-reader-footer{padding:.65rem}.lesson-reader-footer button{font-size:.75rem}.lesson-reader-footer span{display:none}}