.irt-lesson{--irt-width:640px;--irt-accent:#147cce;box-sizing:border-box;width:100%;max-width:var(--irt-width);margin:24px auto;color:#29445b;font:inherit;font-size:14px;line-height:1.9;outline-offset:5px}.irt-lesson *,.irt-lightbox *{box-sizing:border-box}.irt-lesson [hidden],.irt-lightbox [hidden]{display:none!important}.irt-picture{display:block;width:100%;padding:0!important;margin:0!important;border:1px solid #e4eaf0!important;border-radius:10px!important;background:#f6f8fa!important;overflow:hidden;line-height:0!important;box-shadow:none!important;cursor:zoom-in;touch-action:pan-y}.irt-picture img{display:block!important;width:100%!important;height:auto!important;margin:0!important;border:0!important;max-width:100%!important}.irt-caption{font:inherit!important;font-size:13px!important;line-height:1.9!important;margin:9px 2px 0!important;padding:0!important;color:inherit;text-align:right;white-space:pre-line}.irt-caption:empty{display:none}.irt-nav{display:flex;align-items:center;justify-content:center;gap:20px;margin:9px 0 0!important;padding:0!important;min-height:30px}.irt-nav button{font:inherit!important;font-size:12px!important;line-height:1.5!important;padding:5px 8px!important;margin:0!important;background:transparent!important;color:var(--irt-accent)!important;border:0!important;border-radius:5px!important;box-shadow:none!important;width:auto!important;flex:0 0 auto!important;min-width:38px!important;min-height:30px;cursor:pointer}.irt-nav button:disabled{opacity:.28;cursor:default}.irt-nav span{color:#81909c;font:11px/1.5 Tahoma,Arial,sans-serif;direction:ltr;min-width:46px;text-align:center}.irt-lesson button:focus-visible,.irt-lightbox button:focus-visible{outline:2px solid var(--irt-accent)!important;outline-offset:3px}.irt-lightbox{--irt-accent:#147cce;width:min(1180px,96vw);max-width:96vw;max-height:95vh;max-height:95dvh;margin:auto;padding:0;border:0;border-radius:12px;background:#fff;box-shadow:0 16px 80px #0005;color:#29445b;font:14px/1.9 Tahoma,Arial,sans-serif;overflow:auto}.irt-lightbox::backdrop{background:#132536d9}.irt-lightbox-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:6px 12px;background:#fff}.irt-lightbox-head span{font-size:11px;color:#7c8c9b}.irt-lightbox-close{width:32px;height:32px;border:0;border-radius:5px;background:transparent;color:#536b7f;font:24px/1 Arial;cursor:pointer}.irt-lightbox-image{display:block;max-width:100%;width:100%;height:auto;max-height:70vh;max-height:70dvh;object-fit:contain;touch-action:pan-y;background:#f8fafb}.irt-lightbox-foot{padding:9px 16px 12px;background:#fff}.irt-lightbox .irt-caption{font:13px/1.9 Tahoma,Arial,sans-serif!important}.irt-lightbox .irt-nav{margin-top:6px!important}body.irt-modal-open{overflow:hidden}.irt-lesson noscript img{max-width:100%;height:auto}@media(max-width:600px){.irt-lesson{margin:17px auto}.irt-caption{font-size:12px!important}.irt-nav{gap:23px;margin-top:7px!important}.irt-picture{border-radius:7px!important}.irt-lightbox-foot{padding:8px 12px}.irt-lightbox-image{max-height:65dvh}}@media(prefers-reduced-motion:reduce){.irt-lesson *,.irt-lightbox *{scroll-behavior:auto!important}}