:root{--colour-bg: #fff5f7;--colour-board: #f8bbd0;--colour-cell-empty: #f48fb1;--colour-text: #4a0e2a;--colour-accent: #e91e63;--colour-button: #ec407a;--colour-button-hover: #e91e63;--colour-button-active: #c2185b;--font-family: "Nunito", system-ui, sans-serif;--board-gap: 8px;--slide-duration: .15s;--merge-duration: .2s;--spawn-duration: .15s;--border-radius: 12px;--border-radius-sm: 8px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{font-family:var(--font-family);background-colour:var(--colour-bg);background:var(--colour-bg);color:var(--colour-text);min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center}#root{width:100%;max-width:600px;padding:16px;display:flex;flex-direction:column;align-items:center;gap:16px}h1{font-size:2.2rem;font-weight:800;color:var(--colour-accent);letter-spacing:-.5px;text-align:center}h1 .tagline{display:block;font-size:.9rem;font-weight:600;color:var(--colour-text);opacity:.7;margin-top:2px;letter-spacing:0}.board-wrapper{position:relative;width:100%;display:flex;justify-content:center}.board-container{position:relative;border-radius:var(--border-radius);background:var(--colour-board);padding:var(--board-gap);width:100%;aspect-ratio:1;-webkit-user-select:none;user-select:none}.board-background{display:grid;gap:var(--board-gap);width:100%;height:100%}.board-cell-empty{border-radius:var(--border-radius-sm);background:var(--colour-cell-empty);opacity:.4}.board-tiles{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.tile{position:absolute;transition:transform var(--slide-duration) ease;will-change:transform}.tile-inner{width:100%;height:100%;border-radius:var(--border-radius-sm);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;overflow:hidden;box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73}.tile-new .tile-inner{animation:tile-spawn var(--spawn-duration) cubic-bezier(.34,1.56,.64,1) forwards}.tile-merged .tile-inner{animation:tile-merge var(--merge-duration) cubic-bezier(.34,1.56,.64,1) forwards}.tile-number{font-weight:800;line-height:1;text-align:center;text-shadow:0 1px 2px rgba(0,0,0,.15)}@keyframes tile-spawn{0%{transform:scale(0);opacity:0}60%{transform:scale(1.15);opacity:1}to{transform:scale(1);opacity:1}}.tile-prestige .tile-inner{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 12px 2px #b39ddb8c;animation:tile-prestige-pulse 2.8s ease-in-out infinite}.tile-epic .tile-inner{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 18px 4px #ffb74da6;animation:tile-epic-pulse 2.2s ease-in-out infinite}.tile-legendary .tile-inner{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 24px 6px #f48fb1bf,0 0 48px 10px #f48fb14d;animation:tile-legendary-pulse 1.8s ease-in-out infinite}.tile-mythic .tile-inner{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 30px 8px #69f0aebf,0 0 60px 14px #69f0ae4d;animation:tile-mythic-pulse 2.4s ease-in-out infinite}.tile-new.tile-prestige .tile-inner,.tile-new.tile-epic .tile-inner,.tile-new.tile-legendary .tile-inner,.tile-new.tile-mythic .tile-inner{animation:tile-spawn var(--spawn-duration) cubic-bezier(.34,1.56,.64,1) forwards}.tile-merged.tile-prestige .tile-inner,.tile-merged.tile-epic .tile-inner,.tile-merged.tile-legendary .tile-inner,.tile-merged.tile-mythic .tile-inner{animation:tile-merge var(--merge-duration) cubic-bezier(.34,1.56,.64,1) forwards}.tile-prestige.tile-merged:before,.tile-epic.tile-merged:before,.tile-legendary.tile-merged:before,.tile-mythic.tile-merged:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:var(--border-radius-sm);pointer-events:none;animation:merge-ring var(--merge-duration) ease-out forwards}.tile-prestige.tile-merged:before{border:3px solid rgba(179,157,219,.9)}.tile-epic.tile-merged:before{border:3px solid rgba(255,183,77,.9)}.tile-legendary.tile-merged:before{border:3px solid rgba(244,143,177,.9)}.tile-mythic.tile-merged:before{border:3px solid rgba(255,255,255,.95)}@keyframes tile-prestige-pulse{0%,to{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 10px 2px #b39ddb73}50%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 18px 5px #b39ddbbf}}@keyframes tile-epic-pulse{0%,to{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 14px 3px #ffb74d80}50%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 26px 7px #ffb74dcc}}@keyframes tile-legendary-pulse{0%,to{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 20px 5px #f48fb199,0 0 40px 8px #f48fb140}50%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 30px 8px #f48fb1d9,0 0 60px 14px #f48fb166}}@keyframes tile-mythic-pulse{0%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 28px 7px #69f0aea6,0 0 55px 12px #69f0ae40}33%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 32px 9px #ea80fcbf,0 0 62px 15px #ea80fc4d}66%{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 32px 9px #80deeabf,0 0 62px 15px #80deea4d}to{box-shadow:0 3px 10px #4a0e2a38,0 1px 3px #4a0e2a1f,inset 0 1px #ffffff73,0 0 28px 7px #69f0aea6,0 0 55px 12px #69f0ae40}}@keyframes merge-ring{0%{transform:scale(1);opacity:1}to{transform:scale(1.7);opacity:0}}@keyframes tile-merge{0%{transform:scale(1);filter:brightness(1)}45%{transform:scale(1.28);filter:brightness(1.12)}to{transform:scale(1);filter:brightness(1)}}.btn{font-family:var(--font-family);font-weight:700;font-size:.9rem;padding:8px 16px;border:none;border-radius:var(--border-radius-sm);cursor:pointer;background:var(--colour-button);color:#fff;transition:background .12s ease,transform 80ms ease,opacity .12s ease;white-space:nowrap}.btn:hover:not(:disabled){background:var(--colour-button-hover)}.btn:active:not(:disabled){background:var(--colour-button-active);transform:scale(.97)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--colour-button);border:2px solid var(--colour-button)}.btn-secondary:hover:not(:disabled){background:var(--colour-button);color:#fff}.score-board{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;width:100%}.score-card{background:var(--colour-board);border-radius:var(--border-radius-sm);padding:8px 12px;min-width:80px;text-align:center;flex:1 1 70px}.score-card-label{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;opacity:.7;margin-bottom:2px}.score-card-value{font-size:1.2rem;font-weight:800;color:var(--colour-accent)}.game-controls{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;align-items:center;width:100%}.grid-stepper{display:flex;align-items:center;gap:6px}.grid-stepper-label{font-size:.85rem;font-weight:700;min-width:70px;text-align:center}.btn-stepper{font-family:var(--font-family);font-size:1rem;font-weight:800;width:30px;height:30px;border:2px solid var(--colour-button);border-radius:50%;background:transparent;color:var(--colour-button);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .12s ease,color .12s ease;line-height:1;padding:0}.btn-stepper:hover:not(:disabled){background:var(--colour-button);color:#fff}.btn-stepper:disabled{opacity:.35;cursor:not-allowed}.game-over-overlay{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:var(--border-radius);background:#fce4ece0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;z-index:10;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.game-over-title{font-size:2rem;font-weight:800;color:var(--colour-accent)}.game-over-stats{font-size:1rem;font-weight:600;text-align:center;line-height:1.6}.game-over-highscore{font-size:.95rem;font-weight:800;color:var(--colour-accent);background:#fff;padding:4px 12px;border-radius:20px}.game-over-buttons{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#4a0e2a66;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.modal{background:var(--colour-bg);border-radius:var(--border-radius);padding:24px;max-width:520px;width:100%;max-height:80dvh;overflow-y:auto;box-shadow:0 8px 32px #4a0e2a40}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.modal-title{font-size:1.3rem;font-weight:800;color:var(--colour-accent)}.scores-table{width:100%;border-collapse:collapse;font-size:.85rem}.scores-table th{font-weight:700;text-transform:uppercase;font-size:.7rem;letter-spacing:.05em;padding:6px 8px;border-bottom:2px solid var(--colour-board);text-align:right;opacity:.7}.scores-table th:first-child,.scores-table td:first-child{text-align:left}.scores-table td{padding:8px;border-bottom:1px solid var(--colour-board);text-align:right;font-weight:600}.scores-table tr:last-child td{border-bottom:none}.scores-table .rank-1 td{color:var(--colour-accent);font-weight:800}.scores-empty{text-align:center;opacity:.6;padding:24px 0;font-weight:600}.high-scores-btn-row{width:100%;display:flex;justify-content:center;gap:8px;margin-top:4px}.settings-modal{max-width:420px}.settings-list{display:flex;flex-direction:column;gap:20px}.settings-item{display:flex;flex-direction:column;gap:6px}.settings-item-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.settings-label{font-size:1rem;font-weight:700;color:var(--colour-text);cursor:default}.settings-value-badge{font-size:.95rem;font-weight:800;color:var(--colour-accent);background:var(--colour-board);padding:2px 10px;border-radius:20px;min-width:48px;text-align:center}.settings-desc{font-size:.8rem;font-weight:600;opacity:.6;line-height:1.4}.settings-slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:6px;background:var(--colour-board);border-radius:3px;outline:none;cursor:pointer;margin-top:4px}.settings-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:22px;height:22px;background:var(--colour-accent);border-radius:50%;cursor:pointer;border:3px solid #fff;box-shadow:0 1px 4px #4a0e2a4d;transition:background .12s ease}.settings-slider::-moz-range-thumb{width:22px;height:22px;background:var(--colour-accent);border-radius:50%;cursor:pointer;border:3px solid #fff;box-shadow:0 1px 4px #4a0e2a4d}.settings-slider-labels{display:flex;justify-content:space-between;font-size:.7rem;font-weight:700;opacity:.5;text-transform:uppercase;letter-spacing:.04em;margin-top:2px}.settings-toggle{position:relative;width:46px;height:26px;border:none;border-radius:13px;background:var(--colour-board);cursor:pointer;padding:0;transition:background .2s ease;flex-shrink:0}.settings-toggle--on{background:var(--colour-accent)}.settings-toggle-thumb{position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 1px 4px #0003;transition:transform .2s cubic-bezier(.34,1.56,.64,1)}.settings-toggle--on .settings-toggle-thumb{transform:translate(20px)}.helper{display:flex;align-items:flex-end;gap:10px;width:100%;padding:0 4px;min-height:52px}.helper-avatar{font-size:2rem;line-height:1;flex-shrink:0;animation:helper-idle 3s ease-in-out infinite;transform-origin:bottom center}@keyframes helper-idle{0%,to{transform:rotate(-4deg)}50%{transform:rotate(4deg)}}.helper-bubble{background:#fff;border:2px solid var(--colour-board);border-radius:14px 14px 14px 4px;padding:8px 14px;font-size:.85rem;font-weight:600;color:var(--colour-text);line-height:1.4;box-shadow:0 2px 8px #4a0e2a14;animation:bubble-in .25s cubic-bezier(.34,1.56,.64,1);flex:1}@keyframes bubble-in{0%{opacity:0;transform:scale(.85) translateY(4px)}to{opacity:1;transform:scale(1) translateY(0)}}