@import url('https://fonts.googleapis.com/css2?family=Golos+Text:wght@400;500;600;700;800;900&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--bg:#f8f8fc;--white:#fff;--ink:#29273e;--muted:#9391a5;--line:#eae9f2;--violet:#6d5ce7;--deep:#302a6e;--lavender:#efedfd;--green:#c8ef9e;--mint:#eef7e4;--orange:#f0b67b;--peach:#fff2e5;--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:var(--bg);font:14px/1.65 'Golos Text',Arial,sans-serif;overflow-x:clip}button,input,select{font:inherit}button{cursor:pointer;color:inherit;border:0}a{color:inherit;text-decoration:none}button,a,input{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #a69aef;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:'Manrope','Golos Text',sans-serif;line-height:1.2}h1{font-size:38px;font-weight:800;letter-spacing:-1.5px;margin-bottom:12px}h2{font-size:23px;letter-spacing:-.6px}h3{font-size:18px;letter-spacing:-.3px}.topbar{height:83px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 32px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;background:#f8f8fcf2;backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:12px;font-size:19px;font-weight:800;letter-spacing:.5px;line-height:1.2}.brand-num{height:43px;width:43px;display:grid;place-items:center;background:var(--violet);color:white;border-radius:13px;font:800 22px 'Manrope';position:relative;box-shadow:0 5px 14px #6d5ce71a}.brand-num>span{position:absolute;right:-4px;bottom:-3px;background:var(--green);color:#45622c;font-size:14px;width:18px;height:18px;border-radius:6px;display:grid;place-items:center}.brand small{display:block;font-size:8px;font-weight:500;letter-spacing:1.5px;margin-top:6px;color:#8f8aab}.topbar nav{display:flex;gap:32px;font-size:12px;font-weight:500}.topbar nav>a{padding:30px 0;position:relative}.topbar nav>a.active{color:var(--violet)}.topbar nav>a.active:after{content:'';position:absolute;bottom:14px;height:3px;background:var(--violet);border-radius:5px;left:0;right:0}.topbar nav>a>span{background:var(--lavender);font-size:8px;color:#8d82cc;padding:3px 6px;border-radius:5px;margin-left:5px}.help-open{background:white;border:1px solid var(--line);border-radius:30px;padding:9px 15px;font-size:12px}.help-open:first-letter{font-size:16px;color:var(--violet)}.app-shell{max-width:1700px;margin:auto;display:grid;grid-template-columns:224px minmax(0,1fr) 265px;min-height:calc(100dvh - 83px)}.sidebar{padding:35px 24px;border-right:1px solid var(--line);position:sticky;top:83px;height:calc(100dvh - 83px);overflow-y:auto}.path-head{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:9px;letter-spacing:1.2px;color:#918ba8}.path-head b{font-size:10px;font-weight:500;letter-spacing:0}.progress-track{height:4px;border-radius:20px;background:#eae6f7;margin:12px 0 26px}.progress-track>div{height:100%;background:#8f7fe8;border-radius:20px;transition:width .3s}.scene-link{display:flex;gap:12px;align-items:center;font-size:11px;padding:12px 9px;margin:3px -9px;border-radius:11px;line-height:1.4;color:#8c879f}.scene-link:hover{background:#efedf8}.scene-link.current{background:var(--lavender);color:#6653c7;font-weight:500}.scene-num{width:26px;height:26px;display:grid;place-items:center;border:1px solid #ded9ec;border-radius:9px;font-size:10px;flex-shrink:0;background:#fff8}.scene-link.current .scene-num{background:var(--violet);border-color:var(--violet);color:#fff}.scene-link.done:not(.current) .scene-num{background:#e5f1d9;color:#80a45c;border-color:#dfebd1}.source-badge{border-top:1px solid var(--line);margin-top:23px;padding-top:22px;display:flex;gap:9px;align-items:center}.source-badge strong{display:block;font-size:10px;font-weight:500}.source-badge small{font-size:8px;color:var(--muted)}.source-badge>span:last-child{margin-left:auto;color:#a9a2c1}.live-dot{height:6px;width:6px;background:#95bd66;border-radius:50%;flex-shrink:0}.sidebar-note{font-size:10px;color:#aaa5b9;margin-top:23px;line-height:1.8}main{padding:36px 36px 50px;min-width:0}.helper{padding:33px 23px;border-left:1px solid var(--line);background:#f4f2fa;position:sticky;top:83px;height:calc(100dvh - 83px);overflow-y:auto}.helper-top{display:flex;align-items:center;justify-content:space-between;font-size:8px;letter-spacing:1.2px;color:#aaa1bc;margin-bottom:30px}.helper-top button{display:none;background:transparent;font-size:26px}.helper h2{font-size:21px;margin-bottom:15px}.helper 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20px;background:linear-gradient(145deg,#f7f8fe,#f5f4fc);border-radius:19px;position:relative;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#d5ceed transparent}.board-grid{display:grid;grid-template-columns:repeat(var(--cols),var(--tile,94px));width:max-content;margin:0 auto;position:relative;border:3px solid #b1a5d3;border-radius:9px;overflow:hidden;background:#ded8ee;gap:1px;isolation:isolate}.cell{position:relative;min-width:0;width:var(--tile,94px);height:var(--tile,94px);background:#fff;border:0;padding:0;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.2;transition:background .15s}.cell:hover{background:#f5f1fe}.cell-raw{font:700 25px 'Manrope';color:#79708c;position:relative;z-index:2}.cell-id{position:absolute;left:7px;top:5px;font-size:7px;letter-spacing:.2px;color:#c1b8ce}.cell-label{font-size:7px;color:#b9b0c8;margin-bottom:4px}.cell-score{font:700 25px 'Manrope';color:#7360d1;z-index:2}.cell 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polyline{stroke:#b2a1e7;stroke-width:11;stroke-linecap:round;stroke-linejoin:round;fill:none;opacity:.6}.robot-token{width:39px;height:39px;background:#7b68d7;border-radius:13px;box-shadow:0 4px 0 #59479f,0 6px 12px #6b57bd24;display:grid;place-items:center;position:relative;z-index:3;color:#fff}.robot-token:before{content:'';width:2px;height:7px;position:absolute;left:18px;top:-6px;background:#9a8ac7}.robot-token:after{content:'';width:6px;height:6px;position:absolute;left:16px;top:-9px;background:#c4e598;border-radius:50%}.robot-eyes{display:flex;gap:8px;align-items:center}.robot-eyes>i{display:block;width:6px;height:7px;border-radius:3px;background:#fff}.robot-token.small{width:29px;height:29px;border-radius:9px}.robot-token.small:before{left:13px}.robot-token.small:after{left:11px}.board-legend{display:flex;justify-content:center;gap:17px;margin-top:15px;color:#b0a6be;font-size:8px;flex-wrap:wrap}.board-legend span{display:flex;align-items:center;gap:5px}.legend-dot{height:7px;width:7px;display:inline-block;background:#e6e0f4;border-radius:2px}.legend-dot.purple{background:#8c76d6}.legend-dot.orange{background:#e9c07e}.bench-note{font-size:11px;line-height:1.8;color:#a49ab3;margin:17px 0 0}.coin-exercise{display:flex;align-items:center;justify-content:center;gap:20px;padding:32px 10px}.coin-group{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:center;min-width:70px;max-width:145px;min-height:75px}.coin{width:49px;height:49px;display:grid;place-items:center;border-radius:50%;background:linear-gradient(135deg,#f9e3a5,#eac566);box-shadow:inset 0 0 0 4px #f8e6b3,0 4px 0 #d8b861;color:#ab8c3f;font:700 20px 'Manrope';position:relative}.coin.small{width:33px;height:33px;font-size:13px;box-shadow:inset 0 0 0 3px #f8e6b3,0 3px 0 #d8b861}.math-symbol{font:300 32px 'Manrope';color:#b7aaca}.question-mark{width:60px;height:65px;border:2px dashed 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.15s;min-height:47px}.btn:hover{background:#5e4dcf;transform:translateY(-1px)}.btn:disabled{opacity:.35;cursor:default;transform:none}.btn.light{background:#f0eaf8;color:#8b75ad}.btn.green{background:#d4ebbd;color:#739456}.btn.outline{background:transparent;border:1px solid #ddd2e9;color:#9b87b6}.btn.small{font-size:10px;min-height:36px;padding:9px 13px}.feedback{border-radius:13px;padding:15px 18px;font-size:12px;line-height:1.85;background:#edf5e4;color:#829b65;margin:18px 0 0;border:1px solid #e0edcf;animation:pop .2s ease}.feedback.wrong{background:#fdf2e6;border-color:#f0dfc9;color:#b79974}.feedback strong{font-weight:600}.feedback p{margin:5px 0 0}.feedback .big-equation{font:600 24px/1.7 'Manrope';color:#8c9f73;display:block;margin:6px 0}.lesson-bottom{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:23px}.text-btn{font-size:10px;color:#b3a4c4;border-bottom:1px dashed #cfc1df;background:transparent;padding:0 0 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