._lesson_koajv_1{max-width:1040px}._summary_koajv_1{color:var(--muted)}._player_koajv_1{aspect-ratio:16/9;background:var(--ink);border-radius:8px;width:100%;display:block}._next_koajv_1{border:1px solid var(--line);border-top:4px solid var(--teal);background:#fff;border-radius:8px;margin:32px 0;padding:24px 28px}._next_koajv_1 h2{margin-top:0}._chapters_koajv_1{border-top:1px solid var(--line);padding:0;list-style:none}._chapters_koajv_1 li{border-bottom:1px solid var(--line)}._chapters_koajv_1 button{text-align:left;width:100%;color:var(--ink);background:0 0;border:0;border-radius:0;gap:18px;padding:14px 8px;font-size:15px;font-weight:500;display:flex}._chapters_koajv_1 button:hover{background:#fff}._chapters_koajv_1 span{color:var(--teal);font-variant-numeric:tabular-nums;min-width:48px;font-weight:700}._lesson_koajv_1 footer a{flex-shrink:0}@media (max-width:640px){._next_koajv_1{padding:20px}._lesson_koajv_1 header{margin-bottom:28px}._chapters_koajv_1 button{gap:12px;font-size:14px}}