:root{--ink:#173b32;--muted:#61736c;--page:#f3f5ef;--card:#fffef9;--dark:#6c917b;--light:#ebeed8;--accent:#dfb354;--line:#e1e7dc}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--page);color:var(--ink);font:15px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}button,input,select,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:10px;background:var(--card);padding:9px 13px;color:var(--ink);font-weight:600;transition:background .15s}button:hover{background:#edf2e7}button:disabled{opacity:.45;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:3px}#app{max-width:1160px;margin:auto;padding:18px}.hero{background:var(--ink);color:#fffef2;padding:25px 28px;border-radius:18px;display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.eyebrow{display:block;font-size:10px;font-weight:800;letter-spacing:2px}.hero .eyebrow{color:#d8be7b}.hero h1{font-size:32px;letter-spacing:-.8px;margin:6px 0}.hero h1 span{color:#e4be65}.hero p{margin:0;color:#d0dfd1}.hero-button{background:transparent;color:#fff;border-color:#668878;white-space:nowrap}.hero-button:hover{background:#285245}.layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(315px,.85fr);gap:23px;align-items:start}.board-panel,.side-panel{background:var(--card);border:1px solid var(--line);border-radius:17px;padding:18px;min-width:0}.player{display:flex;align-items:center;gap:12px;padding:1px 1px 13px}.player:has(+.board-actions){padding-top:14px;padding-bottom:4px}.player strong,.player small{display:block}.player 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#f4c355}.square.hint::before{background:#63b5e68a}.square.check::before{content:"";position:absolute;inset:0;background:radial-gradient(#d7584cca,transparent 75%)}.piece{position:relative;z-index:1;font:clamp(25px,5.3vw,57px)/1 "Segoe UI Symbol","DejaVu Sans",serif;user-select:none;filter:drop-shadow(0 2px 1px #17231b44);cursor:grab}.piece.w{color:#fffef1;text-shadow:1px 0 #152b24,-1px 0 #152b24,0 1px #152b24,0 -1px #152b24}.piece.b{color:#192e28;text-shadow:1px 0 #ebeede80,-1px 0 #ebeede80,0 1px #ebeede80,0 -1px #ebeede80}.coord{position:absolute;font-size:10px;line-height:1;font-weight:800;z-index:2;color:#2b4a3c;pointer-events:none}.dark .coord{color:#eef2de}.file{right:4px;bottom:3px}.rank{top:4px;left:3px}.square.target::after{content:"";position:absolute;width:24%;aspect-ratio:1;border-radius:50%;background:#163c3250;z-index:3;pointer-events:none}.square.capture::after{background:transparent;width:85%;border:4px solid #1a433d80}.board-actions{display:flex;gap:7px;margin:13px 0 8px;flex-wrap:wrap}.board-actions button{flex:1;font-size:12px;padding:9px 6px;white-space:nowrap}.status{font-size:14px;border-left:3px solid var(--accent);padding:5px 10px;margin:12px 0;min-height:31px}.status.error{border-color:#be4537;color:#913828}.opening-tag{border-top:1px solid var(--line);margin-top:14px;padding-top:13px}.opening-tag .eyebrow{color:var(--muted);margin-bottom:5px}.opening-tag strong{display:block;font-size:14px}.opening-tag small{color:var(--muted)}.tabs{display:flex;padding:4px;background:#edf1e7;border-radius:12px;margin-bottom:20px}.tabs button{border:0;flex:1;background:transparent;border-radius:9px}.tabs button.active{background:var(--card);box-shadow:0 2px 4px #173b3212}h2{font-size:18px;margin:17px 0 12px}h3{font-size:15px;margin:12px 0}.tab-panel>h2:first-child{margin-top:0}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.wide{grid-column:1/-1}label{display:block;font-size:13px;font-weight:600}input[type=search],select,textarea{display:block;border:1px solid #d4dfd1;padding:10px;border-radius:9px;background:#fff;color:var(--ink);width:100%;margin-top:5px;min-width:0}textarea{resize:vertical}.check{display:flex;align-items:center;gap:8px;margin:13px 0;font-weight:500}.check input{accent-color:var(--ink);width:17px;height:17px}.theme-label{display:flex;align-items:center;gap:14px;justify-content:space-between}.theme-label select{width:130px;margin:0;padding:7px}.primary{background:var(--ink);color:#fff;border-color:var(--ink)}.primary:hover{background:#2e5849}.full{width:100%;margin-top:12px}.history{max-height:210px;min-height:98px;overflow:auto;border:1px solid var(--line);border-radius:10px;background:#f7f8f2}.history p{margin:12px;font-size:13px;color:var(--muted)}.move-row{display:grid;grid-template-columns:36px 1fr 1fr;padding:5px 10px;font:14px/1.5 ui-monospace,Consolas,monospace}.move-row:nth-child(even){background:#eaf0e5}.move-row .number{color:var(--muted)}.muted,small{color:var(--muted);font-size:12px}.pgn-tools{margin-top:16px;border-top:1px solid var(--line);padding-top:12px;font-size:13px}.pgn-tools summary{cursor:pointer;font-weight:600}.pgn-tools label{margin-top:12px}.pgn-tools small{display:block;margin-top:8px}.row{display:flex;gap:8px;align-items:center;margin-top:10px;flex-wrap:wrap}.row button{flex:1;font-size:12px}.opening-list{max-height:335px;overflow:auto}.opening-item{padding:11px 0;border-bottom:1px solid var(--line)}.opening-item h3{margin:0;font-size:13px}.opening-item small{display:block}.opening-item .row{margin-top:6px}.opening-item button{padding:5px 8px;font-size:11px}.opening-item .star{flex:0 0 34px;color:#96711b}.pagination{font-size:12px;justify-content:space-between}.selected-opening{border-top:2px solid var(--line);margin-top:16px;padding-top:14px}.notation{font:12px/1.7 ui-monospace,Consolas,monospace;max-height:110px;overflow:auto;color:var(--muted)}.preview-controls{display:flex;align-items:center;gap:5px;flex-wrap:wrap}.preview-controls button{font-size:11px;padding:6px 8px}.preview-controls strong{flex:1;text-align:center;font-size:12px}.tip-card{background:#f7edcf;border-radius:13px;margin-top:20px;padding:17px;font-size:13px}.tip-card p{margin:7px 0 0}footer{padding:20px 6px 6px;font-size:11px;color:var(--muted)}footer a{margin-left:10px;color:var(--ink)}footer span{display:block}dialog{border:0;border-radius:18px;padding:25px;max-width:95vw;box-shadow:0 20px 60px #173b3250;color:var(--ink)}dialog::backdrop{background:#0d2d2566}.promotion-options{display:flex;gap:10px;margin:16px 0}.promotion-options button{font-size:38px}.promotion-options small{display:block;font-size:12px}body[data-theme=wood]{--dark:#ac825e;--light:#f0dfbd}body[data-theme=blue]{--dark:#648caa;--light:#dfebee}#app:fullscreen{background:var(--page);overflow:auto;max-width:none;padding:24px;}.dragging{opacity:.6}@media(max-width:800px){.layout{grid-template-columns:1fr}.board-panel{padding:13px}.side-panel{padding:16px}.piece{font-size:clamp(26px,8.7vw,62px)}.hero{padding:19px}.hero h1{font-size:27px}.hero p{font-size:12px}.hero-button{font-size:11px;padding:8px}#app{padding:10px}.layout{gap:15px}.history{max-height:150px}.opening-list{max-height:310px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}