.lesson-wrap{width:min(1040px,calc(100% - 40px));margin:0 auto 72px}
.lesson-video{overflow:hidden;background:#10071e;border:1px solid rgba(255,255,255,.14);border-radius:24px;display:flex;justify-content:center}
.lesson-video video{display:block;width:100%;max-height:640px;aspect-ratio:16/9;background:#10071e;object-fit:contain}
.lesson-note{max-width:820px;margin:22px auto;color:#c8cdd2;line-height:1.7}
.lesson-resources{margin:24px 0;gap:20px}.lesson-resources a{color:#c4c5ff;text-underline-offset:4px}
.lesson-sequence{margin:26px 0 50px}.lesson-transcript{max-width:820px;margin:0 auto;line-height:1.85;scroll-margin-top:100px}
.lesson-transcript h2{color:#f5f7fa;font-size:1.7rem}.lesson-transcript p{margin:0 0 22px}
.ac-hero h1{font-size:clamp(2rem,5vw,3.5rem)}
@media(max-width:560px){.lesson-wrap{width:calc(100% - 28px)}.lesson-video{border-radius:16px}.lesson-video video{max-height:72vh;aspect-ratio:9/16}.lesson-resources{justify-content:flex-start;gap:14px}}