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minmax(300px,420px);gap:24px;align-items:start}.mt-lesson-video{position:relative;width:100%;border:0;background:#000}.mt-lesson-placeholder,.mt-lesson-video{aspect-ratio:16/9;border-radius:var(--mt-radius-card)}.mt-lesson-placeholder{display:grid;place-items:center;background:var(--mt-brand-tint);color:var(--mt-neutral-text-secondary);text-align:center;padding:24px}.mt-step-text{font-size:18px;line-height:1.7}html[data-ui-mode=kid] .mt-exercise-panel .ant-typography,html[data-ui-mode=kid] .mt-step-text{font-size:20px}.mt-opening-moves{display:flex;flex-wrap:wrap;gap:6px}.mt-opening-moves button{min-height:40px}.mt-coord-target{font-size:48px;font-weight:800;color:var(--mt-brand-primary);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;text-align:center}@media (max-width:900px){.mt-exercise,.mt-lesson{grid-template-columns:1fr}.mt-exercise-panel{position:static}}.mt-opening-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:20px;align-items:start}.mt-opening-list{display:grid;gap:6px;max-height:70vh;overflow-y:auto}.mt-opening-item{display:grid;gap:2px;padding:10px 12px;border:1px solid var(--mt-neutral-divider);border-radius:var(--mt-radius-control);background:var(--mt-neutral-surface);color:var(--mt-neutral-text);text-align:left;cursor:pointer;font:inherit}.mt-opening-item span{color:var(--mt-neutral-text-secondary);font-size:13px}.mt-opening-item.is-active{border-color:var(--mt-brand-primary);background:var(--mt-brand-tint)}.mt-opening-board{max-width:420px;margin-inline:auto}.mt-opening-board .mt-board-frame{--board-fit:420px}@media (max-width:900px){.mt-opening-layout{grid-template-columns:1fr}.mt-opening-list{display:flex;flex-wrap:nowrap;overflow-x:auto;max-height:none}.mt-opening-item{flex:none;min-width:200px}}.mt-coord-grid{display:grid;gap:4px;margin-top:16px;transition:filter .12s ease}.mt-coord-grid.is-chess{grid-template-columns:repeat(8,1fr)}.mt-coord-grid.is-xq{grid-template-columns:repeat(9,1fr)}.mt-coord-grid button{min-height:44px;border:1px solid var(--mt-neutral-divider);border-radius:6px;background:var(--mt-neutral-surface);color:transparent;cursor:pointer}.mt-coord-grid button:hover{background:var(--mt-brand-tint)}.mt-coord-grid.flash-ok{filter:brightness(1.08) saturate(1.3)}.mt-coord-grid.flash-no{filter:saturate(.6)}.mt-training-tabs .ant-tabs-tab{font-size:16px}.mt-puzzle-modes{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-bottom:24px}.mt-puzzle-mode{display:flex;align-items:center;gap:12px;min-height:82px;padding:14px 16px;border:1px solid var(--mt-neutral-divider);border-radius:var(--mt-radius-card);background:var(--mt-neutral-surface);color:var(--mt-neutral-text);text-align:left;cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s ease}.mt-puzzle-mode:hover{transform:translateY(-2px);border-color:var(--mt-brand-primary)}.mt-puzzle-mode:focus-visible{outline:3px solid var(--mt-board-focus-ring);outline-offset:2px}.mt-puzzle-mode.is-active{border-color:var(--mt-brand-primary);background:var(--mt-brand-primary);color:#fff}.mt-puzzle-mode-icon{display:grid;place-items:center;flex:none;width:42px;height:42px;border-radius:10px;background:linear-gradient(145deg,#fff,var(--mt-card-soft,var(--mt-brand-tint)));color:var(--mt-card-tone,var(--mt-brand-primary));font-size:22px}.mt-puzzle-mode.is-active .mt-puzzle-mode-icon{background:rgb(255 255 255/18%);color:#fff}.mt-puzzle-mode small,.mt-puzzle-mode strong{display:block}.mt-puzzle-mode strong{font-size:17px}.mt-puzzle-mode small{margin-top:3px;color:var(--mt-neutral-text-secondary);line-height:1.35}.mt-puzzle-mode.is-active small{color:rgb(255 255 255/82%)}.mt-daily-puzzle{display:grid;gap:16px}.mt-daily-summary 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10px;font-size:18px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;text-align:center}.mt-rapid-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;width:100%}@media (max-width:600px){.mt-custom-fields,.mt-puzzle-modes{grid-template-columns:1fr}.mt-custom-fields label:last-child{grid-column:auto}.mt-rapid-stats{grid-template-columns:1fr}}