.lesson-next-notice,.lesson-history{margin-block:20px;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:12px;min-width:0}
.lesson-next-notice h2,.lesson-history h2{margin:8px 0;font:500 clamp(24px,3vw,32px)/1.25 var(--font-display);overflow-wrap:anywhere}
.lesson-past-item{padding-block:20px;border-top:1px solid var(--line);min-width:0}
.lesson-past-item h3{margin:0;font:500 24px/1.3 var(--font-display);overflow-wrap:anywhere}
.lesson-material-reader{margin-top:20px;min-width:0}
.lesson-past-slide{display:block;width:100%;max-height:65dvh;object-fit:contain;background:var(--surface);aspect-ratio:16/9}
.lesson-material-reader nav{margin-top:16px;align-items:center;justify-content:space-between}
@media(max-width:720px){.lesson-next-notice,.lesson-history{padding:16px}.lesson-material-reader nav{justify-content:center}.lesson-material-reader .button{flex:1 1 120px}}