:root{color:#172131;font-synthesis:none;text-rendering:optimizelegibility;--accent:#ff554b;--ink:#172131;--muted:#667085;--border:#e5e2dc;--surface:#fffdf9;background:#fffdf9;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,sans-serif}*{box-sizing:border-box}html,body,#root{width:100%;height:100%;min-height:100%;margin:0}html{background:var(--surface);overscroll-behavior:none;-webkit-text-size-adjust:100%}body{overscroll-behavior:none;-webkit-tap-highlight-color:transparent;min-width:320px;min-height:100dvh;overflow:hidden}button,select{font:inherit;touch-action:manipulation}button{-webkit-user-select:none;user-select:none}button:focus-visible{outline-offset:2px;outline:3px solid #ff554b57}.app-shell{grid-template-rows:calc(72px + env(safe-area-inset-top)) minmax(0, 1fr);background:var(--surface);height:100dvh;min-height:100svh;display:grid}.app-header{z-index:10;padding:env(safe-area-inset-top) max(22px, env(safe-area-inset-right)) 0 max(22px, env(safe-area-inset-left));border-bottom:1px solid var(--border);background:#fffdf9f7;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;display:grid;position:relative;box-shadow:0 3px 18px #322b200d}.brand{align-items:center;gap:10px;min-width:0;display:flex}.brand span{letter-spacing:-.035em;white-space:nowrap;font-size:24px;font-weight:800}.history-controls{align-items:center;gap:6px;display:flex}.icon-button{width:40px;height:40px;color:var(--ink);cursor:pointer;background:0 0;border:0;border-radius:10px;place-items:center;display:grid}.icon-button:hover:not(:disabled){background:#f3f1ec}.icon-button:disabled{color:#c7c5c0;cursor:default}.save-status{border-left:1px solid 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16px}.board-heading{margin-bottom:10px}.board-scale{color:#72806f;letter-spacing:.01em;font-size:11px;font-weight:730}.board-select{appearance:none;width:100%;min-height:42px;color:var(--ink);cursor:pointer;background-color:#fff;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23565f6d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");background-position:right 11px center;background-repeat:no-repeat;border:1px solid #dcd9d2;border-radius:10px;padding:0 38px 0 12px;font-size:13px;font-weight:720}.board-select:hover{border-color:#bcb7ae}.board-summary{justify-content:space-between;align-items:baseline;gap:10px;margin-top:10px;display:flex}.board-summary strong{font-size:12px}.board-summary span{color:var(--muted);text-align:right;font-size:10px}.select-tool{border:1px solid var(--border);color:#606874;cursor:pointer;background:#fff;border-radius:9px;align-items:center;gap:6px;min-height:34px;padding:0 9px;font-size:12px;font-weight:700;display:inline-flex}.select-tool svg{width:15px;height:15px}.select-tool--active{color:#d93f36;background:#fff4f2;border-color:#ff948d}.piece-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.piece-card{min-width:0;min-height:116px;color:var(--ink);cursor:pointer;background:linear-gradient(#fff 0%,#fdfcf9 100%);border:1px solid #e2e1dc;border-radius:13px;grid-template-rows:72px auto auto;place-items:center;gap:2px;padding:6px 6px 10px;font-size:13px;font-weight:720;transition:border-color .14s,box-shadow .14s,transform .14s;display:grid}.piece-card:hover{border-color:#cfcac1;transform:translateY(-2px);box-shadow:0 8px 18px #30281e14}.piece-card--active{border-color:var(--accent);background:#fff8f6;box-shadow:0 0 0 2px #ff554b26}.piece-card svg{filter:drop-shadow(0 7px 5px 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