@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500;600;700;800&family=Montserrat:wght@600;700;800&display=swap');
:root{--g2-ink:#14213d;--g2-muted:#516071;--g2-paper:#fffdf8;--g2-line:#dce6ef;--g2-math:#2f80ed;--g2-green:#36b56f;--g2-yellow:#ffd166;--g2-red:#f25f5c;--g2-sky:#dff3ff;--g2-mint:#e8f8ee;--g2-peach:#fff0df;--g2-shadow:0 18px 44px rgba(20,33,61,.11)}
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14px;color:var(--g2-muted);font-size:15px;font-weight:800}.g2-hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px}.g2-panel,.g2-side,.g2-card,.g2-result,.g2-stat,.g2-reward{background:rgba(255,255,255,.94);border:1px solid var(--g2-line);border-radius:8px;box-shadow:var(--g2-shadow)}.g2-panel{padding:28px}.g2-badges{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:18px}.g2-badge{display:inline-flex;min-height:34px;align-items:center;padding:0 12px;border-radius:999px;background:var(--g2-sky);color:#14558f;font-size:15px;font-weight:800}.g2-badge:nth-child(2){background:var(--g2-mint);color:#166534}.g2-panel h1{margin:0 0 10px;font:800 30px/1.2 Montserrat,Quicksand,sans-serif;letter-spacing:0}.g2-panel p,.g2-side p{margin:0;color:var(--g2-muted);font-size:18px;line-height:1.5;font-weight:650}.g2-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.g2-btn{min-height:56px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 20px;border:2px solid transparent;border-radius:16px;font:800 18px/1 Quicksand,sans-serif;text-decoration:none;cursor:pointer;transition:transform .16s ease,box-shadow .16s ease,background .16s ease}.g2-btn:hover{transform:translateY(-1px)}.g2-btn:focus-visible,.g2-choice:focus-visible{outline:4px solid rgba(47,128,237,.28);outline-offset:3px}.g2-primary{background:var(--g2-green);border-color:#20965a;color:#fff}.g2-secondary{background:var(--g2-yellow);border-color:#e4a900;color:#3d2b00}.g2-outline{background:#fff;border-color:var(--g2-math);color:#14558f}.g2-side{padding:22px;display:grid;gap:10px;align-content:start}.g2-side h2{margin:0;font:800 24px/1.25 Montserrat,Quicksand,sans-serif}.g2-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.g2-stat{padding:14px;text-align:center}.g2-stat strong{display:block;font-size:28px;line-height:1}.g2-stat span{color:var(--g2-muted);font-size:15px;font-weight:800}.g2-shell{padding:20px 0 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#bad7ee;border-radius:8px;background:#f8fcff;display:grid;place-items:center;overflow:hidden}.g2-work{display:grid;gap:14px}.g2-topic{display:flex;gap:8px;flex-wrap:wrap}.g2-code,.g2-theme{display:inline-flex;align-items:center;min-height:34px;padding:0 12px;border-radius:999px;background:var(--g2-sky);color:#14558f;font-size:15px;font-weight:800}.g2-theme{background:var(--g2-peach);color:#92400e}.g2-question h2{margin:0;font:800 24px/1.35 Montserrat,Quicksand,sans-serif}.g2-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.g2-choice{min-height:58px;padding:12px 14px;border:2px solid var(--g2-line);border-radius:16px;background:#fff;color:var(--g2-ink);font:800 18px/1.25 Quicksand,sans-serif;text-align:left;cursor:pointer}.g2-choice:hover:not(:disabled){border-color:var(--g2-math);background:#f6fbff}.g2-choice.correct{border-color:#22a45e;background:var(--g2-mint);color:#166534}.g2-choice.wrong{border-color:#f2a19f;background:#fff1f0;color:#9f1d1a}.g2-choice:disabled{cursor:default}.g2-feedback,.g2-hint{padding:13px 15px;border-radius:8px;font-weight:800}.g2-feedback{min-height:54px;border:1px solid var(--g2-line);background:#f8fafc;color:#344255}.g2-feedback.good{border-color:#a7dfb9;background:var(--g2-mint);color:#166534}.g2-feedback.bad{border-color:#f5c1a3;background:var(--g2-peach);color:#8a3b12}.g2-hint{border:1px dashed var(--g2-math);background:var(--g2-sky);color:#123e67}.g2-nav-row{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:4px}.g2-result{display:none;margin-top:16px;padding:24px;text-align:center}.g2-result.show{display:grid;gap:12px}.g2-result h2{margin:0;font:800 28px/1.25 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#d69f00}.v-items{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;font-size:30px}.v-tree{width:190px;height:180px;position:relative}.v-tree:before{content:"";position:absolute;left:78px;bottom:0;width:34px;height:90px;background:#b7791f;border-radius:14px}.v-tree:after{content:"";position:absolute;left:30px;top:5px;width:130px;height:105px;background:#69c779;border-radius:50%}.bird{position:relative;z-index:1;font-size:24px}.v-shapes{display:flex;gap:16px;align-items:center;justify-content:center;flex-wrap:wrap}.shape{display:grid;place-items:center;color:#fff;font-weight:800}.sq{width:82px;height:82px;background:#2f80ed}.rect{width:112px;height:72px;background:#36b56f}.circle{width:88px;height:88px;border-radius:50%;background:#f25f5c}.tri{width:0;height:0;border-left:48px solid transparent;border-right:48px solid transparent;border-bottom:86px solid #ffd166}.cube{width:86px;height:86px;background:linear-gradient(135deg,#8ec5ff,#2f80ed);box-shadow:16px -12px 0 #b8ddff}.cyl{width:88px;height:120px;border-radius:44px/18px;background:linear-gradient(90deg,#74d99f,#36b56f)}.sphere{width:96px;height:96px;border-radius:50%;background:radial-gradient(circle at 30% 25%,#fff,#8ec5ff 32%,#2f80ed)}.v-graph{width:100%;display:grid;gap:8px}.bar-row{display:grid;grid-template-columns:90px 1fr 34px;gap:8px;align-items:center;font-weight:800}.bar-line{height:26px;border-radius:999px;background:#dbeafe;overflow:hidden}.bar-fill{height:100%;background:#36b56f;border-radius:inherit}.v-grid{display:grid;grid-template-columns:repeat(5,42px);grid-auto-rows:42px;gap:5px}.cell{display:grid;place-items:center;border:1px solid #b7c8d8;border-radius:6px;background:#fff;font-weight:800}.cell.path{background:#dff3ff}.cell.goal{background:#e8f8ee}.v-ruler{display:flex;gap:4px;align-items:end}.step{width:34px;height:46px;border-radius:8px 8px 4px 4px;background:#ffd166;border:2px solid 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