.document:has(#chess-practice){max-width:1120px}.practice-intro{font-size:1.15rem;max-width:760px}.practice-progress{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:30px;flex-wrap:wrap}.practice-layout{display:grid;grid-template-columns:minmax(280px,1.15fr) minmax(250px,1fr);gap:28px;margin:24px 0 36px}.practice-board-panel{align-self:start;background:#182f28;border-radius:18px;padding:16px;box-shadow:0 12px 30px #182f2818}.practice-board-heading{display:flex;justify-content:space-between;align-items:center;color:white;margin-bottom:12px;gap:8px}.practice-board-heading .pill{background:#eef4db;color:#173b2d}.practice-board{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));aspect-ratio:1;border:2px solid #132b22;border-radius:4px;overflow:hidden}.practice-square{position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:1;width:100%;min-width:0;border:0;border-radius:0;padding:0;cursor:pointer;touch-action:manipulation}.practice-square.light{background:#ece7d7}.practice-square.dark{background:#708a77}.practice-piece{font-family:'DejaVu Sans','Arial Unicode MS',serif;font-size:clamp(24px,5vw,49px);line-height:1;position:relative;z-index:1}.practice-piece.w{color:#fffdf5;-webkit-text-stroke:1px #273c32;text-shadow:0 2px 1px #1a302866}.practice-piece.b{color:#142b22;-webkit-text-stroke:.5px #f2ebd3}.practice-square small{position:absolute;bottom:1px;left:3px;font-size:10px;font-weight:700;line-height:1.2;color:#193c2c}.practice-square.selected{box-shadow:inset 0 0 0 4px #ecbe34}.practice-square.legal:after{content:'';position:absolute;inset:35%;border:3px solid #234d34;border-radius:50%;background:#d4ff85b0;z-index:2;pointer-events:none}.practice-square:focus-visible{outline:3px solid #1277d0;outline-offset:-4px;z-index:3}.practice-controls{padding:8px 0}.practice-controls h2{margin:8px 0 16px;font-size:1.7rem}.practice-controls p{line-height:1.65}.practice-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0}.practice-actions button,#practice-promotion button{min-height:44px;padding:10px 14px;border:1px solid #cbd5c3;border-radius:10px;background:#fff;color:#203c2c;font:inherit;cursor:pointer}.practice-actions button.cta{background:#c5ef5e;border-color:#a4c945;justify-content:center}.practice-actions button:disabled{opacity:.5;cursor:default}.practice-success,.practice-hint{background:#eef7dd;border-left:4px solid #5d872f;padding:12px;border-radius:4px}.practice-feedback{background:#fff7e5;border-left:4px solid #b48623;padding:12px}.practice-list{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;margin-top:18px}.practice-list button{min-height:48px;border:1px solid #d9dece;border-radius:9px;background:#f7f7f0;cursor:pointer;color:#263c2e;font:inherit;display:flex;flex-direction:column;align-items:center;justify-content:center}.practice-list button[aria-current=step]{outline:2px solid #2c5b3c;outline-offset:1px}.practice-list .solved{background:#d9efb9}.practice-list .seen{background:#fff0c9}.practice-list small{line-height:1}.practice-lessons{border-top:1px solid #dce2d4;padding-top:20px}.practice-lessons ol{display:grid;grid-template-columns:1fr 1fr;gap:14px 32px;padding-left:24px}.practice-lessons li p{font-size:.92rem;margin:4px 0}.practice-links{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin:24px 0}.practice-banner{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px;border-radius:16px;background:#e8f2d7;border:1px solid #c5d8ad;margin:24px 0;color:#173c2b;text-decoration:none}.practice-banner h2{margin:6px 0;font-size:1.5rem}.practice-banner p{margin:0}.practice-banner strong{white-space:nowrap}#practice-promotion{border:1px solid #c5d8ad;color:white;margin-top:12px;border-radius:8px}#practice-promotion button{margin:4px}#practice-share-status:empty{display:none}
@media(max-width:700px){.practice-layout{grid-template-columns:1fr;gap:12px}.practice-board-panel{padding:10px}.practice-piece{font-size:clamp(25px,8vw,48px)}.practice-controls h2{font-size:1.45rem}.practice-lessons ol{grid-template-columns:1fr}.practice-banner{align-items:flex-start;flex-direction:column;padding:20px}.practice-banner strong{white-space:normal}.practice-progress{gap:8px}.practice-square small{font-size:8px}.practice-controls{padding-top:6px}}
#clear-practice,#practice-share{border:0;background:none;padding:8px 0;color:#315b37;font:inherit;text-align:left;cursor:pointer;min-height:44px}.practice-actions .cta{margin:0;display:flex;align-items:center}.practice-actions button:focus-visible,.practice-list button:focus-visible,#practice-share:focus-visible,#clear-practice:focus-visible{outline:3px solid #1277d0;outline-offset:2px}