*{box-sizing:border-box}:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.5;font-weight:400;color:#000;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}button{font-family:inherit}button:focus,button:focus-visible{outline:2px solid #000;outline-offset:2px}.number-tile{width:80px;height:80px;border-radius:50%;border:2px solid #000;background:#fff;color:#000;font-size:1.5rem;font-weight:600;cursor:pointer;transition:all .2s ease;font-family:NYT-Franklin,-apple-system,BlinkMacSystemFont,sans-serif}.number-tile:hover{transform:scale(1.05);box-shadow:0 4px 12px #00000026}.number-tile.selected{background:#00a86b;color:#fff;border-color:#00a86b;transform:scale(1.1);box-shadow:0 4px 16px #00a86b59}.number-tile.new{animation:pop-in .4s cubic-bezier(.175,.885,.32,1.275)}@keyframes pop-in{0%{transform:scale(.3);opacity:0}50%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}@media(max-width:480px){.number-tile{width:64px;height:64px;font-size:1.25rem}}@media(max-width:360px){.number-tile{width:56px;height:56px;font-size:1.1rem}}@media(min-width:768px){.number-tile{width:90px;height:90px;font-size:1.75rem}}.operator-button{width:56px;height:56px;border-radius:50%;border:2px solid #000;background:#f5f5f5;color:#000;font-size:1.5rem;font-weight:500;cursor:pointer;transition:all .15s ease;font-family:NYT-Franklin,-apple-system,BlinkMacSystemFont,sans-serif}.operator-button:hover:not(:disabled):not(.selected){background:#e8e8e8;transform:scale(1.05)}.operator-button.selected{background:#00a86b;color:#fff;border-color:#00a86b;transform:scale(1.1);box-shadow:0 4px 12px #00a86b59}.operator-button:disabled{opacity:.4;cursor:not-allowed}@media(max-width:480px){.operator-button{width:52px;height:52px;font-size:1.25rem}}@media(max-width:360px){.operator-button{width:46px;height:46px;font-size:1.1rem}}@media(min-width:768px){.operator-button{width:64px;height:64px;font-size:1.75rem}}.target{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px 40px;background:linear-gradient(135deg,#f8f8f8,#e8e8e8);border-radius:16px;border:2px solid #ddd;transition:all .3s ease}.target.reached{background:linear-gradient(135deg,#d4edda,#c3e6cb);border-color:#28a745;animation:celebrate .5s ease}.target-label{font-size:.875rem;text-transform:uppercase;letter-spacing:2px;color:#666}.target-number{font-size:3rem;font-weight:700;color:#000}.target.reached .target-number{color:#28a745}@keyframes celebrate{0%,to{transform:scale(1)}25%{transform:scale(1.05)}50%{transform:scale(1.1)}75%{transform:scale(1.05)}}@media(max-width:480px){.target{padding:16px 32px}.target-number{font-size:2.5rem}}.move-history{width:100%;max-width:300px;padding:16px;background:#fafafa;border-radius:12px;min-height:100px}.move-history.empty{display:flex;align-items:center;justify-content:center;color:#888;font-size:.875rem;text-align:center}.move-history h3{margin:0 0 12px;font-size:.875rem;text-transform:uppercase;letter-spacing:1px;color:#666}.moves-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.move-item{display:flex;gap:8px;padding:8px 12px;background:#fff;border-radius:8px;font-size:1rem;animation:slide-in .3s ease}.move-number{color:#888;min-width:24px}.move-equation{font-weight:500}@keyframes slide-in{0%{opacity:0;transform:translate(-10px)}to{opacity:1;transform:translate(0)}}.difficulty-selector{display:flex;gap:8px}.difficulty-button{padding:8px 20px;border:2px solid #ddd;background:#fff;color:#000;border-radius:20px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease}.difficulty-button:hover{border-color:#000}.difficulty-button.active{background:#000;color:#fff;border-color:#000}@media(max-width:480px){.difficulty-button{padding:6px 16px;font-size:.75rem}}.stars{display:flex;gap:8px;font-size:2rem}.star{color:#ddd;transition:all .3s ease}.star.filled{color:#ffc107}.stars.won .star.filled{animation:star-pop .5s cubic-bezier(.175,.885,.32,1.275) forwards}@keyframes star-pop{0%{transform:scale(1)}50%{transform:scale(1.4)}to{transform:scale(1)}}.win-celebration{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:100;animation:fade-in .3s ease}.win-modal{background:#fff;padding:40px 60px;border-radius:20px;text-align:center;animation:scale-in .4s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 20px 60px #0000004d}.win-modal h2{font-size:2.5rem;margin:0 0 8px;color:#000}.target-reached{font-size:1.25rem;color:#666;margin:0 0 24px}.win-stars{display:flex;justify-content:center;gap:12px;margin-bottom:32px}.win-star{font-size:3rem;color:#ddd}.win-star.filled{color:#ffc107;animation:star-appear .5s cubic-bezier(.175,.885,.32,1.275) forwards}.new-puzzle-button{padding:14px 40px;font-size:1.125rem;font-weight:600;background:#000;color:#fff;border:none;border-radius:30px;cursor:pointer;transition:all .2s ease}.new-puzzle-button:hover{transform:scale(1.05);box-shadow:0 4px 16px #0003}.confetti{position:absolute;top:-10px;width:10px;height:10px;border-radius:2px;animation:confetti-fall 3s ease-out forwards}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes scale-in{0%{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}@keyframes star-appear{0%{transform:scale(0) rotate(-180deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}@keyframes confetti-fall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}@media(max-width:480px){.win-modal{padding:32px 40px;margin:16px}.win-modal h2{font-size:2rem}.win-star{font-size:2.5rem}}.game{min-height:100vh;display:flex;flex-direction:column;font-family:NYT-Franklin,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#fff}.game-header{display:flex;justify-content:space-between;align-items:center;padding:16px 24px;border-bottom:1px solid #eee}.game-header h1{font-size:2.25rem;font-weight:800;margin:0;letter-spacing:-1px;background:linear-gradient(135deg,#000,#333);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.game-main{flex:1;display:flex;flex-direction:column;align-items:center;padding:32px 24px;gap:32px;max-width:500px;margin:0 auto;width:100%}.target-section{display:flex;flex-direction:column;align-items:center;gap:16px}.numbers-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;justify-items:center}.operators-row{display:flex;gap:12px;justify-content:center}.controls-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.control-button{padding:10px 24px;border:2px solid #000;background:#fff;color:#000;border-radius:24px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .15s ease}.control-button:hover:not(:disabled){background:#f5f5f5}.control-button:disabled{opacity:.4;cursor:not-allowed}.control-button.primary{background:#000;color:#fff}.control-button.primary:hover{background:#333}@media(max-width:480px){.game-header{flex-direction:column;gap:12px;padding:12px 16px}.game-header h1{font-size:1.875rem}.game-main{padding:20px 16px;gap:20px}.numbers-grid{gap:12px}.control-button{padding:8px 16px;font-size:.75rem}}@media(max-width:360px){.game-header h1{font-size:1.5rem}.game-main{padding:16px 12px;gap:16px}.numbers-grid,.operators-row,.controls-row{gap:8px}.control-button{padding:6px 12px;font-size:.7rem}}@media(min-width:768px){.game-header h1{font-size:2.5rem}.game-main{padding:40px 32px;gap:40px;max-width:600px}.numbers-grid{gap:20px}.operators-row{gap:16px}.control-button{padding:12px 28px;font-size:1rem}}