:root{--bg-color: #0f172a;--text-color: #f8fafc;--primary: #3b82f6;--primary-hover: #2563eb;--board-bg: #1e293b;--cell-bg: #334155;--cell-border: #475569;--highlight-valid: rgba(34, 197, 94, .4);--highlight-invalid: rgba(239, 68, 68, .4);--highlight-hint: rgba(234, 179, 8, .5)}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-color);display:flex;justify-content:center;align-items:center;min-height:100vh}#root{display:flex;flex-direction:column;width:100%;max-width:1000px;padding:2rem;box-sizing:border-box}.game-container{display:flex;flex-direction:column;align-items:center;gap:2rem}@media(min-width:768px){.game-container{flex-direction:row;align-items:flex-start;justify-content:center}}.board{display:grid;grid-template-columns:repeat(9,3rem);grid-template-rows:repeat(9,3rem);gap:2px;background-color:var(--board-bg);padding:4px;border-radius:8px;box-shadow:0 10px 25px #00000080;position:relative}.cell-wrapper:nth-child(3n) .cell{border-right-width:2px;border-right-color:#ef4444}.cell{width:3rem;height:3rem;background-color:var(--cell-bg);display:flex;justify-content:center;align-items:center;font-size:1.5rem;font-weight:600;-webkit-user-select:none;user-select:none;cursor:pointer;border:1px solid var(--cell-border);box-sizing:border-box;transition:background-color .2s,filter .2s,box-shadow .2s}.cell.right-border{border-right:3px solid #000}.cell.bottom-border{border-bottom:3px solid #000}.cell.left-border{border-left:3px solid #000}.cell.top-border{border-top:3px solid #000}.cell:hover{filter:brightness(1.1)}.cell.filled-hole{background-color:#0f172a;color:#94a3b8;border-color:#334155;box-shadow:inset 0 0 10px #000c}.cell.removable:hover{cursor:grab;filter:brightness(1.3);box-shadow:0 0 10px #fff6!important;z-index:5}.cell.highlight-valid{background-color:var(--highlight-valid)!important;box-shadow:inset 0 0 15px #22c55e99!important;z-index:2}.cell.highlight-invalid{background-color:var(--highlight-invalid)!important;box-shadow:inset 0 0 15px #ef444499!important;z-index:2}.cell.highlight-hint{background-color:var(--highlight-hint)!important;box-shadow:inset 0 0 15px #eab308cc!important;font-weight:800;z-index:2}.star{display:inline-block;opacity:0;transform:scale(0)}.star.earned{color:#fbbf24;text-shadow:0 0 15px rgba(251,191,36,.8);animation:starPop .6s cubic-bezier(.175,.885,.32,1.275) forwards}.star.unearned{color:#475569;animation:starPop .6s cubic-bezier(.175,.885,.32,1.275) forwards}@keyframes starPop{0%{transform:scale(0) rotate(-45deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}.instructions-modal-overlay{position:fixed;inset:0;background:#0f172ad9;display:flex;justify-content:center;align-items:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.instructions-modal-content{background:var(--board-bg);padding:2.5rem;border-radius:12px;max-width:500px;width:90%;box-shadow:0 10px 40px #00000080;border:1px solid var(--cell-border);color:#f1f5f9}.instructions-modal-content h2{margin-top:0;margin-bottom:1rem;color:#38bdf8;font-size:2rem;text-align:center}.instructions-modal-content p{font-size:1.1rem;margin-bottom:1rem}.instructions-modal-content ul{padding-left:1.5rem;line-height:1.6}.instructions-modal-content li{margin-bottom:.5rem}.chisel{box-shadow:inset 4px 4px 6px #fff6,inset -4px -4px 6px #00000080!important;border:2px solid #000!important;color:#fff!important;text-shadow:1px 1px 2px rgba(0,0,0,.8)}.hand-area{display:flex;flex-direction:column;gap:1.5rem;width:100%;max-width:300px}.panel{background:var(--board-bg);padding:1.5rem;border-radius:12px;box-shadow:0 4px 15px #0000004d}.panel h3{margin-top:0;margin-bottom:1rem;font-size:1.2rem;text-transform:uppercase;letter-spacing:1px;color:#94a3b8}.piece-container{display:flex;justify-content:center;align-items:center;min-height:100px;background:#0003;border-radius:8px;cursor:pointer;transition:transform .2s,box-shadow .2s;padding:1rem;position:relative}.piece-container:hover{transform:scale(1.05);box-shadow:0 0 15px var(--primary)}.draggable-container{cursor:grab}.draggable-container:active{cursor:grabbing}.piece-container.selected{outline:2px solid var(--primary);box-shadow:0 0 20px var(--primary);transform:scale(1.05)}@keyframes popIn{0%{transform:scale(.8);opacity:.5}50%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.piece-pop{animation:popIn .3s cubic-bezier(.175,.885,.32,1.275) forwards;z-index:10;transition:none!important}@keyframes errorShake{0%,to{transform:translate(0)}20%,60%{transform:translate(-5px);background-color:#ef44444d}40%,80%{transform:translate(5px);background-color:#ef44444d}}.board-error{animation:errorShake .4s ease-in-out}@keyframes winWave{0%,to{transform:translateY(0) scale(1)}50%{transform:translateY(-10px) scale(1.1);background-color:#fde047;box-shadow:inset 0 0 15px #ca8a04;z-index:10}}.win-cell{animation:winWave 1.5s ease-in-out infinite}.piece-grid{display:grid;gap:2px}.piece-cell{width:2.2rem;height:2.2rem;display:flex;justify-content:center;align-items:center;font-weight:700;border-radius:4px;font-size:1.2rem;cursor:grab}.piece-cell:active{cursor:grabbing}.piece-cell.empty{background:transparent;box-shadow:none}.stats{display:flex;justify-content:space-between;margin-bottom:1rem;font-size:1.2rem;font-weight:600}.btn{background:var(--primary);color:#fff;border:none;padding:1rem 2rem;font-size:1.1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:background .2s;width:100%}.btn:hover{background:var(--primary-hover)}.win-screen{position:absolute;inset:0;background:#0f172ae6;display:flex;flex-direction:column;justify-content:center;align-items:center;border-radius:8px;z-index:10}.win-screen h2{font-size:3rem;color:#4ade80;margin-bottom:.5rem;text-shadow:0 0 20px rgba(74,222,128,.5)}.slot-label{position:absolute;top:.5rem;left:.5rem;font-size:.8rem;color:#64748b;font-weight:700}