.mushroom-lesson{max-width:1100px;margin:0 auto;padding:36px 24px}.mushroom-lesson h1{font-size:clamp(2rem,5vw,3.5rem)}.mushroom-lesson p{max-width:850px}.mushroom-lesson .cover{width:100%;height:auto;border-radius:12px}.mushroom-lesson .downloads{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}.mushroom-lesson .downloads a{padding:12px 18px;border:1px solid #718884;border-radius:8px;text-decoration:none}.mushroom-lesson .notice,.mushroom-lesson details{background:#f3f1e9;padding:20px;border-radius:10px;margin:14px 0}.mushroom-lesson pre{white-space:pre-wrap;font:inherit}.mushroom-lesson summary{cursor:pointer;font-weight:bold}.mushroom-lesson iframe{width:100%;aspect-ratio:16/9;border:0}.mushroom-lesson button{padding:8px 16px;cursor:pointer}.mushroom-feature{max-width:1100px;margin:30px auto;padding:24px;display:flex;gap:26px;align-items:center;background:#f3f1e9;border-radius:12px}.mushroom-feature img{width:280px;max-width:100%;height:auto}.mushroom-feature h2{font-size:1.8rem}@media(max-width:650px){.mushroom-feature{display:block;margin:20px 14px}.mushroom-feature img{width:100%}}