.crs-card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow2);align-self:start}
.crs-prog{display:flex;align-items:baseline;gap:10px;padding:6px 8px 12px;border-bottom:1px solid var(--line);margin-bottom:8px}
.crs-prog b{font:800 28px/1 var(--fhead);color:var(--accent-text)}.crs-prog span{color:var(--muted);font-size:14px}
.crs-list{list-style:none;padding:0;margin:0;display:grid;gap:2px}
.crs-list a{display:grid;grid-template-columns:28px 1fr auto 18px;gap:10px;align-items:center;padding:10px 8px;border-radius:12px;font-size:15px;color:var(--text)}
.crs-list a:hover,.crs-list li[aria-current=true] a{background:var(--bg2)}
.crs-list li[aria-current=true] a{font-weight:700;color:var(--head)}
.crs-list .n{width:28px;height:28px;border-radius:50%;background:var(--bg3);color:var(--accent-text);display:grid;place-items:center;font:800 13px/1 var(--fhead)}
.crs-list .d{color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums}
.crs-list .ck{color:var(--ok);font-weight:800;visibility:hidden}.crs-list li.done .ck{visibility:visible}.crs-list li.done .n{background:#e8f7ee;color:var(--ok)}
.crs-list li.q a{margin-top:6px;border-top:1px dashed var(--line);border-radius:0 0 12px 12px}
.crs-g{display:grid;grid-template-columns:1fr 360px;gap:36px;align-items:start}
.crs-lesson h1{font-size:clamp(26px,3.2vw,38px)}
.crs-player{position:relative;border-radius:18px;overflow:hidden;background:#0e0f11;box-shadow:var(--shadow2);aspect-ratio:16/9}
.crs-player video{width:100%;height:100%;display:block}
.crs-nav{display:flex;justify-content:space-between;gap:12px;margin-top:16px;flex-wrap:wrap}
.crs-tr{margin-top:14px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:0 18px}
.crs-tr summary{cursor:pointer;padding:14px 0;font-weight:700;color:var(--head)}.crs-tr p{color:var(--muted);line-height:1.75}
.crs-thumb{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;margin-bottom:14px;background:var(--bg2)}
.crs-quiz{display:grid;gap:14px}.crs-quiz fieldset{margin:0;display:grid;gap:8px}
.crs-quiz legend{font-weight:700;color:var(--head);padding:0 0 6px;float:left;width:100%}
.crs-quiz label{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1.5px solid var(--line);border-radius:12px;cursor:pointer;font-size:15px}
.crs-quiz label:hover{border-color:var(--brand)}.crs-quiz input{margin-top:3px}
.crs-quiz fieldset.ok{border-color:var(--ok)}.crs-quiz fieldset.bad{border-color:#e74c3c}
@media (max-width:980px){.crs-g{grid-template-columns:1fr}}