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28px;line-height:1.6}.course-error{color:#ff6b6b}.lesson-list{flex-direction:column;gap:10px;max-width:640px;margin:0;padding:0;list-style:none;display:flex}.lesson-row{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:12px;align-items:center;gap:16px;padding:16px 18px;text-decoration:none;display:flex}.lesson-row:hover{border-color:var(--accent)}.lesson-status{background:var(--surface-2);width:28px;height:28px;color:var(--text-muted);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;display:flex}.lesson-status--done{color:var(--success);background:#6ef29a26}.lesson-row-title{font-size:15px}.corner-video{z-index:10;background:#000;border:2px solid #ffffff1f;border-radius:16px;width:220px;height:220px;position:absolute;bottom:20px;right:20px;overflow:hidden;box-shadow:0 8px 28px #00000073}.corner-video video{object-fit:cover;width:100%;height:100%;display:block}@media 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