:root{--ink:#101a35;--blue:#2d5bf2;--blue-dark:#17358e;--orange:#ff704d;--yellow:#ffd155;--mint:#60dfad;--paper:#f7f8fc;--muted:#6e778c;--line:rgba(16,26,53,.14)}*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{min-height:100%}body{margin:0;overflow-x:hidden;background:radial-gradient(circle at 8% 10%,rgba(96,223,173,.16),transparent 26%),radial-gradient(circle at 94% 36%,rgba(45,91,242,.13),transparent 28%),var(--paper);color:var(--ink);font-family:Manrope,Arial,sans-serif}button,input{font:inherit}button{color:inherit}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--orange);outline-offset:3px}.play-nav{min-height:76px;padding:13px clamp(18px,5vw,70px);display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.72);backdrop-filter:blur(14px)}.play-nav>a,.play-nav>button{padding:10px 16px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:12px;font-weight:800;cursor:pointer}.game-logo{display:flex;align-items:center;gap:10px;font-weight:800}.game-logo span{width:42px;height:42px;display:grid;place-items:center;border-radius:14px;background:var(--ink);color:var(--yellow);font:700 20px Unbounded,sans-serif}.math-shell{width:min(1200px,calc(100% - 32px));margin:auto;padding:50px 0 80px}.eyebrow{color:var(--blue);font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.lesson{display:grid;grid-template-columns:minmax(310px,.8fr) minmax(480px,1.2fr);gap:clamp(35px,7vw,90px);align-items:center}.lesson h1{margin:18px 0;font:700 clamp(52px,7vw,88px)/.91 Unbounded,sans-serif;letter-spacing:-.08em}.lesson h1 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