:root{--brand:#4338ca;--brand-strong:#3730a3;--brand-soft:#eef2ff;--accent:#f59e0b;--accent-soft:#fff7e6;--ok:#15803d;--ok-soft:#ecfdf3;--warn:#b45309;--warn-soft:#fffbeb;--bad:#b91c1c;--bad-soft:#fef2f2;--text:#111827;--muted:#4b5563;--line:#e5e7eb;--bg:#f7f8fc;--card:#ffffff;--radius:14px;--shadow:0 1px 2px rgba(17,24,39,0.06),0 6px 24px rgba(17,24,39,0.05);--font:"Noto Sans","Noto Sans Devanagari",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--brand:#818cf8;--brand-strong:#a5b4fc;--brand-soft:#1e1b4b;--accent:#fbbf24;--accent-soft:#2a2110;--ok:#4ade80;--ok-soft:#0f2a1a;--warn:#fbbf24;--warn-soft:#2a2110;--bad:#f87171;--bad-soft:#2a1414;--text:#f3f4f6;--muted:#a1a1aa;--line:#2e3140;--bg:#0f111a;--card:#171a26;--shadow:none;color-scheme:dark}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}.hi,:lang(hi){line-height:1.8}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%}h1,h2,h3{line-height:1.25;margin:0 0 .5rem}h1{font-size:clamp(1.6rem,4vw,2.4rem)}h2{font-size:1.35rem}h3{font-size:1.1rem}p{margin:0 0 .75rem}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}.skip-link{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:8px 12px;z-index:100}.skip-link:focus{left:8px}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}.narrow{max-width:520px}.stack>*+*{margin-top:1rem}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.between{justify-content:space-between}.grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:1fr}@media (min-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}@media (min-width:960px){.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}.muted{color:var(--muted)}.small{font-size:.875rem}.center{text-align:center}.mt{margin-top:1rem}.mt-lg{margin-top:2rem}.site-header{background:var(--card);border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:20}.site-header 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var(--line);padding:8px 16px;overflow-x:auto;white-space:nowrap}.sidebar nav{display:flex;gap:4px}.sidebar a{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:10px;color:var(--muted);font-size:.95rem}.sidebar a:hover,.sidebar a[aria-current=page]{background:var(--brand-soft);color:var(--brand);text-decoration:none}.main{padding:20px 16px 48px;min-width:0}@media (min-width:960px){.app{grid-template-columns:240px 1fr}.sidebar{border-bottom:0;border-right:1px solid var(--line);padding:20px 12px;white-space:normal}.sidebar nav{flex-direction:column;position:-webkit-sticky;position:sticky;top:80px}.main{padding:28px 32px 64px}}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);min-width:0}.card h2,.card h3{margin-top:0}.card-link{display:block;color:inherit;transition:border-color .15s,transform 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var(--line);background:var(--card);overflow-wrap:anywhere}.msg-user{align-self:flex-end;background:var(--brand-soft);border-color:transparent;max-width:90%}.msg-ai{align-self:stretch}.msg .meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:8px}.rich p{margin:0 0 .6rem}.rich ol,.rich ul{margin:0 0 .6rem;padding-left:1.3rem}.rich strong{font-weight:700}.composer{position:-webkit-sticky;position:sticky;bottom:0;background:var(--bg);padding:12px 0 4px}.q-card{border-left:4px solid var(--brand)}.option{display:flex;gap:10px;align-items:flex-start;padding:12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;cursor:pointer;font-weight:400;background:var(--card)}.option input{margin-top:4px;width:18px;height:18px;flex:none}.option.correct{border-color:var(--ok);background:var(--ok-soft)}.option.wrong{border-color:var(--bad);background:var(--bad-soft)}.qnav{display:flex;flex-wrap:wrap;gap:6px}.qnav button{width:38px;height:38px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--text);cursor:pointer;font-weight:600}.qnav button.answered{background:var(--brand-soft);border-color:var(--brand);color:var(--brand)}.qnav button.current{outline:2px solid var(--accent)}.pre{white-space:pre-wrap}@media print{.footer,.no-print,.sidebar,.site-header{display:none!important}.app{display:block}.card{box-shadow:none;page-break-inside:avoid;break-inside:avoid}body{background:#fff;color:#000}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.brand>span,.sr-only{white-space:nowrap}@media (max-width:420px){.site-header .nav a:not(.btn){padding:8px 6px;font-size:.9rem}}