.lesson-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:start}.lesson-room{height:430px;position:relative;overflow:hidden;background:linear-gradient(#e6edf4 68%,#d8c9ae 68%);border:1px solid #afbdd0;border-radius:18px}.room-caption{position:absolute;left:25px;top:10px;letter-spacing:2px;font-size:11px;color:#405772}.room-window{position:absolute;top:64px;right:32px;width:115px;height:125px;border:9px solid white;background:linear-gradient(90deg,transparent 47%,white 47% 53%,transparent 53%),linear-gradient(transparent 47%,white 47% 53%,transparent 53%),#b9dcea}.room-rug{position:absolute;bottom:16px;left:20%;width:64%;height:85px;border-radius:50%;background:#b0bcb5}.room-desk{position:absolute;left:7%;top:67%;width:65%;height:14px;background:#947451;box-shadow:0 75px 0 -5px #947451}.device{position:absolute;border:2px solid #667b96;border-radius:12px;background:#fff;color:#182d49;padding:12px;cursor:pointer;font:600 14px 'DM Sans',sans-serif;z-index:1}.device span{display:block;font-size:38px;line-height:1.1;margin-bottom:5px}.device[aria-pressed=true]{background:#173d79;color:white;outline:4px solid #a8c3ed;animation:device-intro .5s ease-out}.device:focus-visible{outline:4px solid #2769d8;outline-offset:4px}.tv{top:21%;left:9%;width:130px}.router{right:8%;bottom:18%}.phone{left:46%;bottom:10%}.laptop{left:9%;bottom:22%}.lesson-controls{display:flex;gap:10px;justify-content:space-between}.replay{border:0;background:none;cursor:pointer;margin-top:20px;padding:8px 0}#lesson-progress{width:100%;height:8px;accent-color:#285ac6;margin-bottom:24px}#knowledge-check{margin-top:30px}#lesson-panel .note{margin:20px 0;padding:15px}#lesson-transcript h3{margin-top:25px}@keyframes device-intro{from{transform:translateY(5px)}to{transform:translateY(0)}}@media(prefers-reduced-motion:reduce){.device[aria-pressed=true]{animation:none}}@media(max-width:800px){.lesson-layout{grid-template-columns:1fr}.lesson-room{height:370px}.device{font-size:12px;padding:9px}.tv{width:105px}.room-window{width:90px;height:100px}}@media print{.lesson-controls,.replay,#quiz{display:none}}