:root{color-scheme:light;--paper:#f7f5f0;--ink:#20263b;--muted:#697185;--line:#e3e3e9;--violet:#5b50d2;--peach:#ffcfb3;--mint:#bcebd4}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 95% 3%,#eae5ff,transparent 36%),radial-gradient(circle at 2% 40%,#ffe9d9,transparent 31%),var(--paper);font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink)}
button,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}a{color:inherit}
.shell{width:min(1110px,calc(100% - 34px));margin:auto}.topbar{display:flex;justify-content:space-between;align-items:center;padding:22px 0 7px;gap:20px}.brand{text-decoration:none;font-size:1.3rem;font-weight:870;letter-spacing:-.045em}.brand-mark{display:inline-grid;place-items:center;background:#d7d0ff;width:33px;height:33px;border-radius:10px;margin-right:5px}.toplinks{display:flex;gap:19px}.toplinks a{text-decoration:none;font-size:.9rem;font-weight:750;color:#535e72}.toplinks a:hover{text-decoration:underline}
.intro{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:33px 0 31px}.kicker{display:inline-block;padding:5px 13px;background:#d6f2e1;border-radius:30px;font-size:.72rem;font-weight:850;letter-spacing:.07em;text-transform:uppercase}h1{font-size:clamp(3rem,7vw,5rem);letter-spacing:-.074em;line-height:1.1;margin:14px 0 9px}h1 span{color:var(--violet)}.lead{max-width:630px;color:var(--muted);font-size:1.03rem;margin:0}.sum-doodle{display:flex;gap:5px;font-size:1.6rem;font-weight:900;align-items:center;transform:rotate(-8deg)}.sum-doodle span{display:grid;place-items:center;background:#d5d0ff;border:2px solid #4c446d;border-radius:15px;width:43px;height:49px}.sum-doodle span:nth-child(2),.sum-doodle span:nth-child(4){background:#fff1e3}.sum-doodle span:last-child{background:#bcebd4}
.layout{display:grid;grid-template-columns:minmax(0,1.42fr) minmax(295px,.86fr);gap:22px;align-items:start;padding-bottom:55px}.card{background:#fff;border:1px solid #e7e7ed;border-radius:24px;box-shadow:0 16px 42px #20263b0c}.game-card{padding:25px}.game-head{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:16px}.game-head h2{font-size:1.45rem;letter-spacing:-.044em;margin:0}.micro{display:block;font-size:.69rem;color:#8389a0;text-transform:uppercase;letter-spacing:.08em;font-weight:850;margin-bottom:4px}.small-note{font-size:.8rem;color:var(--muted);margin:5px 0 0}.picker{flex:0 1 196px}select{width:100%;background:#f6f4ff;border:1px solid #dcd8f6;padding:11px 9px;border-radius:12px;color:#343452;font-weight:750;max-width:100%}
.endless-controls{display:flex;gap:12px;align-items:end;flex-wrap:wrap;background:#f2efff;border:1px solid #dfdaf7;border-radius:15px;padding:12px;margin-bottom:17px}.endless-controls[hidden]{display:none}.endless-controls label{flex:1;min-width:140px}.new-puzzle{background:var(--violet);color:white;padding:11px 16px;border:1px solid var(--violet);border-radius:12px;font-weight:800;min-height:45px}.endless-controls .small-note{flex-basis:100%;margin:0}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-bottom:13px}.stat{border-radius:13px;background:#f4f6fa;padding:11px 8px 11px 11px}.stat-target{background:#e9e5ff}.stat strong{display:block;font-size:1.33rem;line-height:1.3;font-variant-numeric:tabular-nums;font-weight:900}.status{text-align:center;color:#5f6484;font-weight:680;margin:9px 0 12px;min-height:25px;font-size:.88rem}
.board-wrap{max-width:510px;margin:auto}.board{--n:4;display:grid;grid-template-columns:repeat(var(--n),minmax(0,1fr));gap:6px;border:3px solid #272b4a;background:#e1dff7;padding:9px;border-radius:20px;aspect-ratio:1;box-shadow:0 4px 0 #aaa5d1}
.tile{min-width:0;min-height:0;border:2px solid #dedee9;border-radius:12px;display:flex;align-items:center;justify-content:center;position:relative;background:#fcfdff;color:#303553;font-size:clamp(.9rem,2.7vw,1.42rem);font-weight:850;aspect-ratio:1;user-select:none;touch-action:manipulation;transition:background .12s,transform .12s}
.tile:nth-child(4n+2){background:#f6f7fe}.tile:hover:not(:disabled){border-color:#9b91e7}.tile:focus-visible{outline:3px solid #e89957;outline-offset:2px;z-index:6}.tile.start{background:#daf5e6;border-color:#85cba2}.tile.finish{background:#ffe4d6;border-color:#f0ac8a}.tile.visited{background:#cfc8ff;border-color:#8175e4;color:#322d6b}.tile.head{background:#7469e3;color:white;border-color:#5146b7;box-shadow:0 2px 6px #5146b74d}.tile.start.head{background:#258f6e;border-color:#1a7758;color:white}.tile.finish.head{background:#e48b5c;border-color:#ce6b3b;color:white}.tile .mark{position:absolute;top:4px;left:5px;font-size:.46rem;font-weight:950;text-transform:uppercase;letter-spacing:.02em;line-height:1}.tile .step-num{position:absolute;right:4px;bottom:3px;min-width:16px;height:16px;display:grid;place-items:center;border-radius:50%;background:#fff;color:#4e44aa;font-size:.58rem;line-height:1}.tile.head .step-num{background:#2c266c;color:white}
.board-foot{display:flex;align-items:center;flex-wrap:wrap;justify-content:space-between;gap:7px;color:#666d80;font-size:.77rem;font-weight:750;margin:12px 0}.board-foot>span{display:inline-flex;align-items:center;gap:5px}.color-dot{width:10px;height:10px;display:inline-block;border-radius:50%}.start-dot{background:#2c9e78}.finish-dot{background:#e58b59}.progress{width:100%;height:7px;background:#e9e9f0;border-radius:20px;overflow:hidden;margin:0 0 15px}.progress span{display:block;width:0;height:100%;background:#7569e3;transition:width .15s}.actions{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.actions button,.win-actions button{border:1px solid #dedbea;border-radius:12px;background:#fff;padding:12px 5px;color:#2d3152;font-weight:800}.actions .primary,.win-actions button:first-child{background:#343353;color:#fff;border-color:#343353}.actions button:not(:disabled):hover,.win-actions button:hover{filter:brightness(.96)}
.win{margin-top:18px;padding:18px;background:#eae7ff;border:1px solid #d4cdfd;border-radius:16px}.win[hidden]{display:none}.win h3{margin:0 0 4px;font-size:1.2rem}.win p{margin:0 0 13px;color:#535978;font-size:.9rem}.win-actions{display:flex;gap:10px;flex-wrap:wrap}.win-actions button{padding:10px 14px}.win-actions .secondary{background:#fff}
.sidebar{display:grid;gap:18px}.sidebar .card{padding:22px}.sidebar h2{font-size:1.15rem;letter-spacing:-.03em;margin:0 0 12px}.info ol{padding-left:21px;margin:0}.info li{margin:0 0 13px;color:#676e81;font-size:.89rem}.info li strong{color:#343750}.notice{font-size:.83rem;color:#706a83;background:#f3f0ff;border-radius:11px;padding:12px;margin:6px 0 0}.score{background:#edfaf2}.score-row{display:flex;justify-content:space-between;gap:11px;font-size:.88rem;margin:12px 0}.score-row span{color:#55665f}.score-row strong{font-variant-numeric:tabular-nums}.remember{display:flex;align-items:flex-start;gap:10px;padding-top:14px;border-top:1px solid #d2e8da;margin-top:15px;cursor:pointer}.remember input{width:19px;height:19px;margin:2px 0 0;accent-color:#5147bb;flex-shrink:0}.remember strong{display:block;font-size:.84rem}.remember small{display:block;color:#50675c;font-size:.76rem;line-height:1.5;margin-top:3px}
.next-up{background:#fff4e9}.next-up p{color:var(--muted);font-size:.86rem;margin:0 0 13px}.next-up a{color:#493bac;font-weight:850;font-size:.88rem}
footer{display:flex;justify-content:space-between;gap:17px;flex-wrap:wrap;border-top:1px solid #e0dedc;padding:23px 0 34px;color:#777d8a;font-size:.79rem}footer nav{display:flex;gap:13px;flex-wrap:wrap}footer a{text-decoration:none}footer a:hover{text-decoration:underline}.toast{position:fixed;bottom:23px;left:50%;transform:translate(-50%,20px);background:#2f3150;color:white;border-radius:13px;padding:11px 16px;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;z-index:20;font-size:.87rem;font-weight:700;max-width:calc(100vw - 30px);text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:850px){.layout{grid-template-columns:1fr}.sidebar{grid-template-columns:repeat(2,1fr)}.sidebar .next-up{grid-column:1/-1}.intro{padding:30px 0}}
@media(max-width:580px){.shell{width:calc(100% - 24px)}.topbar{padding-top:15px}.intro{padding:24px 0}.intro h1{font-size:3.2rem}.sum-doodle{display:none}.game-card{padding:14px;border-radius:20px}.game-head{gap:8px}.game-head h2{font-size:1.23rem}.picker{flex:0 0 145px}.picker select{font-size:.76rem;padding:10px 4px}.stats{gap:5px}.stat{padding:8px 5px}.stat strong{font-size:1.09rem}.stat .micro{font-size:.58rem}.board{gap:4px;padding:5px;border-width:2px;border-radius:15px}.tile{border-width:1.5px;border-radius:8px;font-size:clamp(.8rem,4.2vw,1.16rem)}.tile .mark{font-size:.36rem;top:2px;left:2px}.tile .step-num{width:12px;min-width:12px;height:12px;font-size:.46rem;right:2px;bottom:2px}.sidebar{grid-template-columns:1fr}.sidebar .card{padding:19px}.actions button{font-size:.85rem}.board-foot{font-size:.71rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}