.mainline-lesson{margin:20px 0 26px;padding:24px}.mainline-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.mainline-heading h2{margin:5px 0 0;font-size:23px}.mainline-counter{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}.mainline-layout{display:grid;grid-template-columns:minmax(260px,410px) minmax(250px,1fr);gap:28px;align-items:start}.mainline-board{display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1;width:100%;overflow:hidden;border-radius:7px;box-shadow:0 4px 14px #0002}.mainline-square{position:relative;display:grid;place-items:center;aspect-ratio:1;background:var(--board-light,#e7e0d2)}.mainline-square.dark{background:var(--board-dark,#6d8760)}.mainline-square.last-move:after{content:'';position:absolute;inset:0;background:#e5c74e50;pointer-events:none}.mainline-square img{position:relative;z-index:1;width:94%;height:94%}.mainline-rank,.mainline-file{position:absolute;font-size:clamp(9px,1vw,12px);font-weight:700;line-height:1;color:#3d4831;z-index:2}.mainline-square.dark small{color:#f1eadf}.mainline-rank{left:3px;top:2px}.mainline-file{bottom:1px;right:3px}.mainline-controls{display:flex;align-items:center;justify-content:space-between;gap:7px;margin-top:12px}.mainline-controls .button{flex:1;min-width:0;padding-inline:9px}.mainline-coach-head{display:flex;align-items:center;gap:13px}.mainline-coach-head img{width:94px;height:94px;object-fit:contain}.mainline-coach-name{color:var(--muted);font-size:12px}.mainline-coach-head h3{font-size:28px;margin:5px 0}.mainline-speech{padding:16px 19px;background:var(--surface-2,#33312e);border-radius:4px 16px 16px 16px;margin:8px 0 19px;font-size:16px;line-height:1.6}.mainline-speech p,.mainline-plan p{margin:0}.mainline-plan{line-height:1.55;color:var(--muted);font-size:14px}.mainline-plan strong{display:block;margin-bottom:7px;color:var(--text)}.mainline-voice-row{display:flex;gap:10px;align-items:center;margin-top:14px}.mainline-voice-row small,.mainline-basis{color:var(--muted);font-size:11px}.mainline-basis{display:block;margin-top:10px}.mainline-score{margin-top:20px;border-top:1px solid var(--border);padding-top:15px}.mainline-score summary{cursor:pointer;color:var(--muted);font-size:13px}.mainline-move-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}.mainline-move-list .move-token{border:0;cursor:pointer}.mainline-move-list .move-token.active{background:var(--accent,#789e51);color:white}.mainline-next-step{font-size:12px;color:var(--muted);margin:16px 0 0}.opening-extra-filters{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:12px;margin:12px 0 18px}.opening-extra-filters label{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted)}.opening-extra-filters .select{width:100%}.opening-filter-count{margin-top:8px}.opening-archive-note{font-size:11px;color:var(--muted);margin:4px 0 14px}
@media(max-width:880px){.mainline-layout{grid-template-columns:minmax(240px,.9fr) 1fr;gap:18px}.mainline-lesson{padding:18px}.mainline-coach-head img{width:72px;height:72px}.mainline-speech{font-size:14px;padding:13px}.mainline-plan{font-size:13px}.mainline-heading h2{font-size:20px}}
@media(max-width:620px){.mainline-layout{grid-template-columns:1fr}.mainline-board-column{max-width:430px;width:100%;margin-inline:auto}.mainline-lesson{padding:13px;margin-top:15px}.mainline-heading{gap:8px;margin-bottom:15px}.mainline-heading h2{font-size:18px}.mainline-coach-head img{width:66px;height:66px}.mainline-coach-head h3{font-size:23px}.mainline-coach{min-width:0}.mainline-controls .icon-button{width:32px;min-width:32px}.opening-extra-filters{grid-template-columns:1fr 1fr;gap:10px}.opening-extra-filters label:last-child{grid-column:1/-1}.mainline-score summary{line-height:1.6}.mainline-voice-row{flex-wrap:wrap}}

.opening-course-tools{display:flex;justify-content:flex-end;gap:8px;margin:-32px 0 14px}.opening-course-tools .button{min-height:32px;font-size:11px;padding:6px 11px}.opening-course-tools [aria-pressed="true"]{color:var(--green);border-color:var(--green)}
@media(max-width:620px){.opening-course-tools{margin:0 0 12px;justify-content:flex-start;flex-wrap:wrap}}