:root{color:#111;background:#e5e5e5;font-family:ui-serif,Georgia,Times New Roman,serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:0;min-height:100vh;overflow-x:hidden}button,select{font:inherit}.app{width:min(1120px,100%);margin:0 auto;padding:16px}.hero{display:grid;gap:6px;margin-bottom:12px;text-align:center}.hero h1{margin:0;font-size:clamp(2rem,8vw,4.5rem);letter-spacing:-.06em}.hero p{min-height:1.5em;margin:0;font-size:clamp(1rem,3.4vw,1.5rem);font-weight:700}.toolbar{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(86px,1fr));margin-bottom:10px}.settings{display:grid;gap:8px;grid-template-columns:repeat(4,minmax(0,1fr));margin-bottom:10px}.toolbar button,.settings select{width:100%;min-width:0;min-height:46px;border:2px solid #111;background:#f7f7f7;color:#111;border-radius:10px;font-weight:800}.settings select{font-size:clamp(.7rem,2.4vw,.95rem);padding:0 4px}.toolbar button{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 4px;font-size:clamp(.72rem,2.6vw,1rem)}.toolbar button:active,.toolbar button:focus-visible,.settings select:focus-visible{outline:4px solid #555}.toolbar button:disabled{opacity:.45}.settings label{display:grid;gap:4px;min-width:0;font-size:.82rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.play-area{display:grid;grid-template-columns:minmax(0,1fr) minmax(160px,240px);gap:14px;align-items:start}.play-area.history-hidden{grid-template-columns:minmax(0,1fr)}.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(100%,calc(100vh - 260px));min-width:0;aspect-ratio:1 / 1;align-self:start;justify-self:center;border:5px solid #111;border-radius:14px;overflow:hidden;box-shadow:0 18px 40px #00000029}.play-area.history-hidden .board{width:100%}.square{position:relative;display:grid;place-items:center;min-width:0;min-height:0;aspect-ratio:1 / 1;border:0;padding:5%}.square.light{background:#eee}.square.dark{background:#8d8d8d}.square.last:before,.square.selected:before,.square.target:before{content:"";position:absolute;top:8%;right:8%;bottom:8%;left:8%;border-radius:12%;pointer-events:none}.square.last:before{background:#ffffff6b}.square.selected:before{border:5px solid #111}.square.target:before{border:4px dashed #111}.square img{position:relative;z-index:1;width:94%;height:94%;object-fit:contain;filter:grayscale(1) drop-shadow(0 2px 1px rgba(0,0,0,.25))}.unicode-piece{position:relative;z-index:1;font-size:clamp(1.8rem,8vw,5.2rem);line-height:1}.history{max-height:min(76vh,760px);overflow:auto;border:3px solid #111;border-radius:14px;background:#f7f7f7;padding:10px 12px}.history h2{margin:0 0 8px;font-size:1.1rem;font-weight:900}.history ol{columns:1;margin:0;padding-left:1.4em;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-weight:800}.history li{display:list-item;break-inside:avoid;padding-bottom:3px}.notes{margin-top:14px;color:#333;font-size:.9rem}.about-page{border:3px solid #111;border-radius:14px;background:#f7f7f7;padding:16px;font-size:1.05rem;line-height:1.45}.about-page h2{margin-top:0}.about-page button{min-height:46px;border:2px solid #111;border-radius:10px;background:#111;color:#fff;font-weight:900;padding:0 16px}.review-nav{display:grid;grid-template-columns:1fr 1fr minmax(0,2fr) 1fr 1fr;gap:3px;margin-bottom:8px}.review-nav button{min-height:32px;border:2px solid #111;border-radius:6px;background:#f7f7f7;font-weight:900;cursor:pointer;font-size:.9rem;padding:0}.review-nav button:disabled{opacity:.4;cursor:default}.review-label{display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700}.history li{cursor:pointer;border-radius:3px;padding-left:2px}.history li:hover{background:#e8e8e8}.history li.active{background:#ddd;font-weight:900}@media(max-width:760px){.app{padding:10px}.play-area{grid-template-columns:1fr}.history{max-height:170px}.board{width:min(100%,calc(100vw - 20px),calc(100vh - 330px))}}