.chip{width:var(--chip-size);height:var(--chip-size);padding:0;border:none;background:transparent;perspective:600px;border-radius:var(--radius);flex-shrink:0;position:relative}.chip--selected:after{content:"";position:absolute;top:-5px;right:-5px;bottom:-5px;left:-5px;border-radius:50%;border:2.5px solid var(--accent);box-shadow:0 0 8px rgba(var(--accent-rgb),.45);pointer-events:none}.chip--compact{width:var(--chip-size-compact, 57px);height:var(--chip-size-compact, 57px)}.chip:disabled{cursor:default}.chip-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d}.chip-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:clamp(.75rem,3vw,1.1rem);overflow:hidden}.chip-face--back{transform:rotateY(0)}.chip-face--front{background-size:cover;background-position:center;background-repeat:no-repeat;color:var(--chip-front-text);transform:rotateY(180deg)}.chip-back-img{width:100%;height:100%;object-fit:cover;display:block}.chip-value{font-variant-numeric:tabular-nums;text-shadow:0 1px 3px rgba(0,0,0,.45)}.chip-board-wrap{display:flex;flex-direction:column;align-items:center;gap:.5rem}.chip-board-hint{margin:0;font-size:.85rem;color:var(--accent);font-weight:600;min-height:1.2em}.chip-board-hint--empty{display:none}.chip-board{display:grid;gap:6px;justify-content:center}.chip-board--compact{gap:4px;max-width:360px;width:100%}.fireworks{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;pointer-events:none;overflow:hidden}.fireworks-burst{position:absolute;width:0;height:0}.fireworks-particle{position:absolute;top:0;left:0;width:var(--size);height:var(--size);background:var(--color);border-radius:50%;opacity:0;box-shadow:0 0 calc(var(--size) * 2) var(--color);animation:firework-particle 1.8s ease-out forwards}@keyframes firework-particle{0%{transform:rotate(var(--angle)) translateY(0) scale(2);opacity:0}5%{opacity:1}30%{opacity:.9}to{transform:rotate(var(--angle)) translateY(calc(var(--distance) * -1)) scale(.1);opacity:0}}.solution-hint{flex-shrink:0}.btn-solution-toggle{width:100%;min-height:40px;padding:.45rem .75rem;border:1px dashed rgba(var(--accent-rgb),.45);border-radius:var(--radius);background:rgba(var(--accent-rgb),.08);color:var(--accent);font-size:.85rem;font-weight:600;display:flex;align-items:center;justify-content:center;gap:.4rem}.btn-solution-toggle:hover{background:rgba(var(--accent-rgb),.15)}.solution-arrow{display:inline-block;font-size:.7rem;line-height:1;transition:transform .2s ease}.solution-arrow--up{transform:rotate(180deg)}.solution-hint-panel{margin-top:.5rem;padding:.65rem .75rem;background:#00000040;border-radius:var(--radius);border:1px solid rgba(255,255,255,.08)}.solution-hint-title{margin:0 0 .5rem;font-size:.8rem;color:var(--text-muted)}.solution-hint-title strong{color:var(--accent)}.solution-hint-empty{margin:0;font-size:.85rem}.solution-hint-steps{margin:0;padding:0;list-style:none;counter-reset:solution-step;font-size:.9rem;line-height:1.5}.solution-hint-steps li{counter-increment:solution-step;display:flex;gap:.35rem;align-items:baseline;font-variant-numeric:tabular-nums}.solution-hint-steps li:before{content:counter(solution-step) " →";flex-shrink:0;font-weight:600;color:var(--step-arrow)}.solution-hint-steps li+li{margin-top:.25rem}.solution-hint--inline .btn-solution-toggle{width:auto}.result-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:1rem;padding-top:calc(1rem + var(--safe-top));padding-bottom:calc(1rem + var(--safe-bottom));background:#000000bf;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.result-card{width:100%;max-width:360px;padding:1.5rem;background:var(--bg-panel);border-radius:16px;border:2px solid rgba(255,255,255,.1);text-align:center}.result-card--exact{border-color:var(--accent);box-shadow:0 0 24px rgba(var(--accent-rgb),.35)}.result-title{margin:0 0 1rem;font-size:1.5rem}.result-title--success{color:var(--accent)}.result-stats{display:grid;gap:.75rem;text-align:left;margin-bottom:1rem}.result-stat{display:flex;justify-content:space-between;gap:1rem}.result-stat-label{color:var(--text-muted);font-size:.85rem}.result-stat-value{font-weight:700;font-variant-numeric:tabular-nums}.result-mode{margin:0 0 .75rem;font-size:.8rem;color:var(--text-muted)}.result-solution{margin-bottom:1rem;text-align:left}.result-new-game{width:100%}.result-card--exact .result-overlay:before{content:""}@keyframes confetti-fall{to{transform:translateY(100vh) rotate(360deg);opacity:0}}.countdown-builder{display:flex;flex-direction:column;gap:.75rem}.countdown-hint{margin:0;font-size:.8rem;color:var(--text-muted);text-align:center}.countdown-hint--goal{color:var(--accent);font-weight:600}.countdown-num--goal{border-color:var(--accent)!important;border-width:3px;box-shadow:0 0 14px rgba(var(--accent-rgb),.45)}.countdown-num--goal.countdown-num--original{background:linear-gradient(145deg,var(--accent),var(--chip-front-to));color:#1a1200}.countdown-num--goal.countdown-num--computed{background:var(--bg-panel);color:var(--accent)}.btn--goal-ready{animation:goal-pulse 1.5s ease-in-out infinite}@keyframes goal-pulse{0%,to{box-shadow:0 0 rgba(var(--accent-rgb),.5)}50%{box-shadow:0 0 16px 4px rgba(var(--accent-rgb),.6)}}.countdown-numbers{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.countdown-num{min-width:52px;min-height:52px;padding:.5rem .75rem;border-radius:var(--radius);border:2px solid 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li+li{margin-top:.25rem}.operations-step-result{color:var(--accent);font-weight:800}.solve-panel{flex:0 1 auto;min-height:0;display:flex;flex-direction:column;gap:.5rem}.solve-header{display:flex;flex-direction:column;align-items:center;gap:.35rem;flex-shrink:0}.solve-panels-row{display:flex;gap:.5rem;max-width:360px;width:100%;margin:0 auto}.solve-panels-row>*{flex:1;min-width:0}.settings-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center;background:#0000008c;padding:1rem}.settings-modal{width:100%;max-width:340px;background:var(--bg-panel);border-radius:14px;padding:1.25rem;box-shadow:0 8px 32px #00000080}.settings-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem}.settings-title{margin:0;font-size:1.1rem;font-weight:700}.settings-close{background:none;border:none;color:var(--text-muted);font-size:1.2rem;padding:.25rem;line-height:1}.settings-close:hover{color:var(--text)}.settings-section{margin-bottom:1rem}.settings-section:last-child{margin-bottom:0}.settings-section-title{margin:0 0 .5rem;font-size:.85rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}.settings-toggle-group{display:flex;gap:.5rem}.settings-select{width:100%;min-height:44px;padding:.5rem 2rem .5rem .75rem;border:2px solid rgba(255,255,255,.12);border-radius:var(--radius);background:#ffffff0a;color:var(--text);font-weight:600;font-size:.9rem;-moz-appearance:none;appearance:none;-webkit-appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' 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#d4d4d4;--accent-dim: #9a9a9a;--accent-rgb: 212, 212, 212;--chip-front-to: #888888;--chip-computed-from: #3a3a3a;--chip-computed-to: #222222;--chip-front-text: #f0f0f0;--step-arrow: #7a7a7a}html,body,#root{height:100%;margin:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;touch-action:manipulation;overflow:hidden}button{font:inherit;cursor:pointer;touch-action:manipulation}input{font:inherit}.app{display:flex;flex-direction:column;height:100%;max-width:600px;margin:0 auto;padding:var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left)}.app-header{flex-shrink:0;text-align:center;padding:.5rem 1rem;display:flex;flex-direction:column;align-items:center;gap:.5rem}.app-logo{width:100%;max-width:280px;height:auto;display:block}.app-header-actions{display:flex;align-items:center;gap:.4rem}.btn-icon{min-height:40px;width:40px;padding:0;border:1px solid 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rgba(255,255,255,.08);border-radius:var(--radius);padding:2rem;width:100%;max-width:400px}.auth-title{font-size:1.5rem;margin:0 0 1.5rem;text-align:center;color:var(--accent)}.auth-subtitle{font-size:1rem;margin:0 0 1rem;color:var(--accent)}.auth-form{display:flex;flex-direction:column;gap:1rem}.auth-label{display:flex;flex-direction:column;gap:.35rem;font-size:.85rem;color:var(--text-muted)}.auth-input{padding:.6rem .75rem;border:1px solid rgba(255,255,255,.15);border-radius:var(--radius);background:#0000004d;color:var(--text);font-size:1rem;transition:border-color .15s}.auth-input:focus{outline:none;border-color:var(--accent)}.auth-input--code{font-size:1.5rem;letter-spacing:.5em;text-align:center;font-variant-numeric:tabular-nums}.auth-btn{padding:.7rem;border:1px solid var(--accent);border-radius:var(--radius);background:var(--accent);color:#000;font-weight:600;font-size:1rem;cursor:pointer;transition:opacity 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