@import "https://fonts.googleapis.com/css2?family=Nunito:wght@600;700;800;900&family=Mukta:wght@500;700;800&display=swap";:root{--bg:#f8f7f2;--surface:#fff;--surface-2:#f3f1ea;--ink:#1d1d1c;--text:#43423e;--muted:#6f6e69;--border:#e6e2d8;--primary:#9b3cf0;--primary-edge:#6f1fc2;--on-primary:#fff;--accent:#7a2bd6;--lilac:#f3e8ff;--lilac-border:#dab2ff;--landing:#e8daf8;--good:#2f9e2a;--good-bg:#e7f8df;--good-border:#9be27a;--bad:#e03535;--bad-bg:#ffe9e9;--bad-border:#ffb2b2;--info-bg:#fff5d3;--streak:#ff9600;--gem:#e5a800;--maths:#ff9147;--maths-edge:#eb6928;--maths-soft:#fff0e6;--science:#4ad5e8;--science-edge:#2c91af;--science-soft:#dff7fb;--english:#f788d2;--english-edge:#b036a4;--english-soft:#fde4f5;--mascot-shadow:drop-shadow(0 4px 14px #9b3cf029);--radius:12px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#190922;--surface:#22102f;--surface-2:#2a1638;--ink:#f8f7f2;--text:#e4d9f0;--muted:#a99bbd;--border:#3f2a55;--primary:#b26bf5;--primary-edge:#8200db;--on-primary:#fff;--accent:#c99bff;--lilac:#2f1745;--lilac-border:#6a3a99;--landing:#1f0d2c;--good:#58df8c;--good-bg:#133022;--good-border:#2f7a4e;--bad:#ff7b7b;--bad-bg:#3a1420;--bad-border:#7a2a3a;--info-bg:#2e2340;--streak:#ff9f2e;--gem:#ffe747;--maths:#58df8c;--maths-edge:#2f9e5c;--maths-soft:#143222;--science:#b977f8;--science-edge:#8200db;--science-soft:#2c1640;--english:#51b1fb;--english-edge:#2c7fc4;--english-soft:#0f2640;--mascot-shadow:drop-shadow(0 6px 10px #00000059);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{background:var(--bg);color:var(--text);letter-spacing:.02em;-webkit-font-smoothing:antialiased;font-family:Nunito,ui-rounded,system-ui,sans-serif;font-size:16px;line-height:1.45}:lang(ne),.ne{letter-spacing:0;font-family:Mukta,Nunito,system-ui,sans-serif}h1,h2,h3{color:var(--ink);margin:0;font-weight:900;line-height:1.2}p{margin:0}a{color:var(--accent)}button{font:inherit;letter-spacing:inherit}img{max-width:100%}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.btn{letter-spacing:.08em;text-transform:uppercase;width:100%;min-height:50px;color:var(--on-primary);background:var(--primary);border:none;border-bottom:4px solid var(--primary-edge);border-radius:var(--radius);cursor:pointer;justify-content:center;align-items:center;gap:8px;padding:12px 18px;font-size:16px;font-weight:800;text-decoration:none;transition:transform 60ms,filter .15s;display:inline-flex}.btn:hover{filter:brightness(1.05)}.btn:active{border-bottom-width:2px;transform:translateY(2px)}.btn:disabled{background:var(--border);border-bottom-color:var(--border);color:var(--muted);cursor:default;filter:none;transform:none}.btn.ghost{background:var(--surface);color:var(--accent);border:2px solid var(--border);border-bottom-width:4px}.btn.small{width:auto;min-height:40px;padding:8px 14px;font-size:14px}.btn.inline{width:auto}.linkbtn{color:var(--accent);cursor:pointer;background:0 0;border:none;padding:6px;font-weight:800;text-decoration:underline}.field{flex-direction:column;gap:6px;display:flex}.field label{color:var(--ink);font-size:15px;font-weight:800}.input{width:100%;min-height:50px;font:inherit;color:var(--ink);background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);border-bottom-width:4px;padding:10px 14px;font-size:17px;font-weight:700}.input:focus{border-color:var(--lilac-border);outline:none}.input.ok{border-color:var(--good-border);background:var(--good-bg);color:var(--good)}.input.no{border-color:var(--bad-border);background:var(--bad-bg);color:var(--bad)}.choice{font:inherit;border-radius:var(--radius);border:2px solid var(--border);background:var(--surface);min-height:52px;color:var(--text);cursor:pointer;border-bottom-width:4px;padding:8px 12px;font-weight:800}.choice[aria-pressed=true]{border-color:var(--lilac-border);background:var(--lilac);color:var(--accent)}.choice:disabled{opacity:.55;cursor:default}.card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:16px}.card.lilac{border-color:var(--lilac-border);border-bottom-width:4px}.chip{background:var(--surface-2);color:var(--muted);border-radius:999px;align-items:center;gap:6px;padding:4px 10px;font-size:13px;font-weight:800;display:inline-flex}.eyebrow{letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-size:13px;font-weight:800}.muted{color:var(--muted)}.small{font-size:14px}.row{align-items:center;gap:12px;display:flex}.stack{flex-direction:column;gap:12px;display:flex}.grow{flex:auto;min-width:0}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.bubble{background:var(--surface);border:2px solid var(--border);color:var(--ink);border-bottom-width:4px;border-radius:16px;padding:10px 14px;font-weight:800;position:relative}.bubble.left:after{content:"";background:var(--surface);border-left:2px solid var(--border);border-bottom:2px solid var(--border);width:14px;height:14px;position:absolute;bottom:18px;left:-9px;transform:rotate(45deg)}.mascot{object-fit:contain;object-position:center bottom;filter:var(--mascot-shadow);-webkit-user-select:none;user-select:none;-webkit-user-drag:none;flex-shrink:0;display:block}.shell{min-height:100dvh;display:flex}.sidebar{display:none}.main{flex-direction:column;flex:auto;min-width:0;display:flex}.topbar{border-bottom:2px solid var(--border);background:var(--bg);z-index:5;justify-content:space-between;align-items:center;padding:14px 20px 10px;display:flex;position:sticky;top:0}.page{flex-direction:column;gap:18px;width:100%;max-width:980px;margin:0 auto;padding:20px 20px 110px;display:flex}.tabbar{z-index:10;background:var(--bg);border-top:2px solid var(--border);padding:8px 6px calc(12px + env(safe-area-inset-bottom));grid-template-columns:repeat(5,minmax(0,1fr));gap:2px;display:grid;position:fixed;bottom:0;left:0;right:0}.tab{color:var(--muted);border-radius:var(--radius);border:2px solid #0000;flex-direction:column;align-items:center;gap:2px;padding:6px 0;font-size:12px;font-weight:800;text-decoration:none;display:flex}.tab.active{color:var(--accent);background:var(--lilac);border-color:var(--lilac-border)}.brand{color:var(--primary);letter-spacing:-.01em;font-size:24px;font-weight:900;text-decoration:none}.stat{align-items:center;gap:4px;font-size:17px;font-weight:900;display:inline-flex}@media (width>=900px){.sidebar{border-right:2px solid var(--border);flex-direction:column;flex:none;gap:24px;width:250px;height:100dvh;padding:24px 16px;display:flex;position:sticky;top:0}.sidebar nav{flex-direction:column;gap:6px;display:flex}.side-link{letter-spacing:.06em;text-transform:uppercase;color:var(--muted);border-radius:var(--radius);border:2px solid #0000;align-items:center;gap:14px;padding:10px 12px;font-size:15px;font-weight:800;text-decoration:none;display:flex}.side-link.active{color:var(--accent);background:var(--lilac);border-color:var(--lilac-border)}.tabbar,.topbar .brand{display:none}.page{padding:28px 32px 48px}}.subj-maths{--s:var(--maths);--s-edge:var(--maths-edge);--s-soft:var(--maths-soft)}.subj-science{--s:var(--science);--s-edge:var(--science-edge);--s-soft:var(--science-soft)}.subj-english{--s:var(--english);--s-edge:var(--english-edge);--s-soft:var(--english-soft)}.s-text{color:var(--s-edge)}:root[data-theme=dark] .s-text{color:var(--s)}.player{max-width:680px;min-height:100dvh;padding:12px 18px calc(110px + env(safe-area-inset-bottom));flex-direction:column;margin:0 auto;display:flex}.player-top{align-items:center;gap:12px;padding:4px 0 14px;display:flex}.iconbtn{border-radius:var(--radius);width:44px;height:44px;color:var(--muted);cursor:pointer;background:0 0;border:none;flex:none;place-items:center;text-decoration:none;display:grid}.iconbtn:hover{background:var(--surface-2)}.bar{flex:1;grid-template-columns:repeat(5,1fr);gap:5px;display:grid}.bar span{background:var(--border);border-radius:99px;height:14px}.bar span.done{background:var(--primary)}.bar 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li{opacity:.4;align-items:center;gap:10px;transition:opacity .2s;display:flex}.steps-list li.on{opacity:1}.steps-list .n{background:var(--primary);color:#fff;border-radius:50%;flex:none;place-items:center;width:28px;height:28px;font-weight:900;display:grid}.lines{flex-direction:column;gap:8px;display:flex}.line{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);opacity:.35;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;transition:opacity .2s;display:flex}.line.on{opacity:1;border-color:var(--lilac-border)}.line b{white-space:nowrap;color:var(--ink)}.formula{text-align:center;color:var(--ink);padding:8px;font-size:32px;font-weight:900}.eq{background:var(--surface-2);border-radius:var(--radius);padding:10px 14px;font-weight:800}.dimrow{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);grid-template-columns:34px 1fr auto;align-items:center;gap:10px;padding:8px 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button{font:inherit;border:2px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;border-radius:10px;padding:8px 12px;font-size:14px;font-weight:800}.seg button[aria-pressed=true]{border-color:var(--lilac-border);background:var(--lilac);color:var(--accent)}.news{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:8px;padding:14px 16px;font-size:16px;display:flex}.news .dl{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-size:12px;font-weight:900}.w{cursor:pointer;border-radius:6px;padding:1px 2px}.w:hover{background:var(--lilac)}.w.ok{background:var(--good-bg);color:var(--good);font-weight:800}.w.no{background:var(--bad-bg);color:var(--bad)}.quote{background:var(--surface-2);border-left:4px solid var(--primary);color:var(--ink);border-radius:8px;padding:10px 14px;font-style:italic;font-weight:700}.compare{flex-direction:column;gap:6px;display:flex}.compare .lbl{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-size:12px;font-weight:900}.compare .d{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);color:var(--ink);padding:10px 14px;font-weight:700;transition:opacity .2s}mark{background:var(--lilac);color:var(--accent);border-radius:4px;padding:0 3px;font-weight:900}.rules{flex-direction:column;gap:8px;display:flex}.rule{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);color:var(--ink);grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;padding:10px 14px;display:grid}.rule .arrow{color:var(--primary);font-size:22px;font-weight:900}.built{background:var(--surface);border:2px dashed var(--border);border-radius:var(--radius);flex-wrap:wrap;align-items:center;gap:6px;min-height:58px;padding:8px;display:flex}.built.ok{border-style:solid;border-color:var(--good-border);background:var(--good-bg)}.built.no{border-style:solid;border-color:var(--bad-border);background:var(--bad-bg)}.built .ph{color:var(--muted);padding:0 6px;font-weight:700}.tiles{flex-wrap:wrap;gap:8px;display:flex}.tile{font:inherit;border:2px solid var(--border);background:var(--surface);color:var(--ink);cursor:pointer;border-bottom-width:4px;border-radius:10px;padding:8px 12px;font-size:16px;font-weight:800}.tile.used{visibility:hidden}.fixline{color:var(--ink);font-size:20px;font-weight:700;line-height:2}.fill-grid{grid-template-columns:1fr 110px;align-items:center;gap:8px 12px;display:grid}.fill-grid label{color:var(--ink);align-items:center;gap:8px;font-weight:800;display:flex}.venn{width:100%;max-width:380px;margin:0 auto;display:block}.venn.tappable{cursor:pointer}.venn text{font-family:Nunito,sans-serif}.results-star{color:var(--gem);font-size:64px;line-height:1}.stats3{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.stats3>div{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);text-align:center;padding:12px}.stats3 b{color:var(--ink);font-size:24px;font-weight:900;display:block}.stats3 span{text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-size:12px;font-weight:800}.list-row{border-bottom:2px solid var(--border);justify-content:space-between;gap:10px;padding:8px 0;font-weight:700;display:flex}.calc-btn{z-index:20;position:fixed;top:12px;right:max(12px,50vw - 328px)}.calc{z-index:20;background:var(--surface);border:2px solid var(--border);border-bottom-width:4px;border-radius:16px;width:280px;padding:12px;position:fixed;top:64px;right:max(12px,50vw - 328px);box-shadow:0 12px 30px #1e0a322e}.calc .screen{background:var(--surface-2);text-align:right;border-radius:10px;padding:8px 12px}.calc .expr{min-height:20px;color:var(--muted);word-break:break-all;font-weight:700}.calc .out{color:var(--ink);font-size:28px;font-weight:900}.calc .out.err{color:var(--bad);font-size:15px}.calc .keys{grid-template-columns:repeat(4,1fr);gap:6px;margin:10px 0;display:grid}.calc .keys button{border:2px solid var(--border);background:var(--surface);min-height:44px;color:var(--ink);cursor:pointer;border-bottom-width:4px;border-radius:10px;font-size:18px;font-weight:900}.calc .keys button.op{color:var(--accent)}.calc .keys button.eq{background:var(--primary);color:#fff;border-color:var(--primary-edge)}.path{flex-direction:column;gap:14px;padding:8px 0 24px;display:flex}.node-row{flex-direction:column;align-items:center;gap:6px;display:flex}.node{border:none;border-radius:50%;place-items:center;font-weight:900;text-decoration:none;display:grid}.node-cap{text-align:center;max-width:190px;font-size:13px;font-weight:800}.landing{background:var(--landing);min-height:100dvh}.landing-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;max-width:1200px;margin:0 auto;padding:14px 24px;display:flex}.landing-main{flex-direction:column;gap:56px;max-width:1200px;margin:0 auto;padding:32px 24px 64px;display:flex}.hero{flex-wrap:wrap;align-items:center;gap:40px;display:flex}.hero h1{letter-spacing:-.02em;color:var(--primary);font-size:clamp(34px,5vw,56px);line-height:1.08}.hero-art{flex:340px;justify-content:center;display:flex}.hero-art img{aspect-ratio:3/4;object-fit:cover;width:460px;max-width:100%;display:block;-webkit-mask-image:radial-gradient(50% 50%,#000 84%,#0000 100%);mask-image:radial-gradient(50% 50%,#000 84%,#0000 100%)}:root[data-theme=dark] .landing{--landing:#e8daf8;--surface:#fff;--ink:#1d1d1c;--text:#43423e;--muted:#5f5870;--lilac-border:#dab2ff;--primary:#9b3cf0;--primary-edge:#6f1fc2;--accent:#7a2bd6;color:var(--text)}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;display:grid}.feature{background:var(--surface);border:2px solid var(--lilac-border);border-bottom-width:4px;border-radius:16px;flex-direction:column;gap:8px;padding:20px;display:flex}.centered{flex-direction:column;justify-content:center;align-items:center;min-height:100dvh;padding:24px 20px;display:flex}.panel{flex-direction:column;gap:18px;width:100%;max-width:440px;display:flex}.grid5{grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;display:grid}.grid7{grid-template-columns:repeat(7,minmax(0,1fr));gap:6px;display:grid}.grid4{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;display:grid}.grid3{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;display:grid}.grid2{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.progress-line{background:var(--border);border-radius:99px;height:16px;overflow:hidden}.progress-line>div{background:var(--primary);border-radius:99px;height:100%;transition:width .3s}.err-box{background:var(--bad-bg);color:var(--bad);border-radius:var(--radius);padding:10px 14px;font-weight:700}.spinner{border:4px solid var(--lilac-border);border-top-color:var(--primary);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}