:root{--base-font-size:16px;--background:#ffffff;--foreground:#000000;--card-bg:#ffffff;--secondary-bg:#f8f9fa;--border-color:#dee2e6;--text-primary:#000000;--text-secondary:#374151;--text-muted:#6b7280;--input-bg:#ffffff;--input-border:#ced4da;--state-selected-bg:#d1e7fd;--state-selected-border:#0d6efd;--state-selected-text:#000000;--state-correct-bg:#d1e7dd;--state-correct-border:#198754;--state-correct-text:#0f5132;--state-incorrect-bg:#f8d7da;--state-incorrect-border:#dc3545;--state-incorrect-text:#842029;--state-marked-bg:#f3e8ff;--state-marked-border:#dcd1ea;--state-marked-text:#5a3d7e;--option-bg:#ffffff;--option-border:#adb5bd;--quicktip-bg:#e0f2ff;--quicktip-border:#b6d4fe;--quicktip-accent:#0d6efd;--quicktip-text:#0c5460;--explanation-bg:#f8f9fa;--variant-blue-bg:#e0f7fa;--variant-blue-border:#b2ebf2;--variant-blue-text:#006064;--variant-green-bg:#f1f8e9;--variant-green-border:#c5e1a5;--variant-green-text:#33691e;--variant-purple-bg:#f3e5f5;--variant-purple-border:#e1bee7;--variant-purple-text:#4a148c;--variant-orange-bg:#fff3e0;--variant-orange-border:#ffe0b2;--variant-orange-text:#e65100;--variant-indigo-bg:#eef2ff;--variant-indigo-border:#c7d2fe;--variant-indigo-text:#312e81;--timer-bg:#ffffff;--timer-text:#111827;--timer-shadow:rgba(0,0,0,0.1);--nav-highlight-bg:rgba(13,110,253,0.2);--score-banner-bg:linear-gradient(135deg,#1e293b,#0f172a);--score-banner-text:#ffffff;--score-banner-muted:rgba(255,255,255,0.8);--score-banner-secondary:rgba(255,255,255,0.45);--score-banner-badge-bg:rgba(255,255,255,0.15);--score-banner-badge-text:#ffffff;--score-banner-badge-border:rgba(255,255,255,0.1);--text-highlight-bg:#fff3cd;--text-highlight-color:#000000;--color-default:#111827;--color-primary:#2563EB;--color-secondary:#7C3AED;--color-neutral:#6B7280;--color-force:#DC2626;--color-velocity:#0284C7;--color-acceleration:#16A34A;--color-momentum:#0D9488;--color-energy:#D97706;--color-virtual:#9CA3AF;--color-laser:#DB2777;--color-e-field:#EA580C;--color-b-field:#C026D3;--color-heat:#E11D48}[class=dark]{--background:#0a0a0a;--foreground:#ededed;--card-bg:#171717;--secondary-bg:#262626;--border-color:#404040;--text-primary:#ffffff;--text-secondary:#e5e7eb;--text-muted:#9ca3af;--input-bg:#171717;--input-border:#404040;--state-selected-bg:#0c2d48;--state-selected-border:#0d6efd;--state-selected-text:#e0f2ff;--state-correct-bg:#052c16;--state-correct-border:#198754;--state-correct-text:#d1e7dd;--state-incorrect-bg:#2c0b0e;--state-incorrect-border:#dc3545;--state-incorrect-text:#f8d7da;--state-marked-bg:#3b0764;--state-marked-border:#7e22ce;--state-marked-text:#f5f3ff;--option-bg:#2a2a2a;--option-border:#525252;--quicktip-bg:#082840;--quicktip-border:#0d6efd;--quicktip-accent:#0d6efd;--quicktip-text:#d1e7dd;--explanation-bg:#1f1f1f;--variant-blue-bg:#154c59;--variant-blue-border:#00838f;--variant-blue-text:#e0f7fa;--variant-green-bg:#2e4a1c;--variant-green-border:#558b2f;--variant-green-text:#dcedc8;--variant-purple-bg:#4a148c;--variant-purple-border:#7b1fa2;--variant-purple-text:#f3e5f5;--variant-orange-bg:#5f280a;--variant-orange-border:#b84c0e;--variant-orange-text:#ffe0b2;--variant-indigo-bg:#1e1b4b;--variant-indigo-border:#4338ca;--variant-indigo-text:#e0e7ff;--timer-bg:#1f2937;--timer-text:#f3f4f6;--timer-shadow:rgba(0,0,0,0.5);--nav-highlight-bg:rgba(255,193,7,0.35);--score-banner-bg:linear-gradient(135deg,#0c1524,#111827);--score-banner-text:#ffffff;--score-banner-muted:rgba(255,255,255,0.7);--score-banner-secondary:rgba(255,255,255,0.35);--score-banner-badge-bg:rgba(255,255,255,0.1);--score-banner-badge-text:rgba(255,255,255,0.9);--score-banner-badge-border:rgba(255,255,255,0.08);--text-highlight-bg:#ffc107;--text-highlight-color:#000000;--color-default:#F9FAFB;--color-primary:#60A5FA;--color-secondary:#A78BFA;--color-neutral:#9CA3AF;--color-force:#F87171;--color-velocity:#38BDF8;--color-acceleration:#4ADE80;--color-momentum:#2DD4BF;--color-energy:#FBBF24;--color-virtual:#6B7280;--color-laser:#F472B6;--color-e-field:#FB923C;--color-b-field:#E879F9;--color-heat:#FB7185}[data-font-size=small]{--base-font-size:14px}[data-font-size=large]{--base-font-size:18px}[data-font-size=xlarge]{--base-font-size:20px}html{font-size:var(--base-font-size);color-scheme:light dark;max-width:100vw;overflow-x:hidden;scroll-behavior:smooth}body{color:var(--foreground);background:var(--background);font-family:var(--font-inter),"Noto Sans Devanagari","Noto Sans Telugu","Noto Sans Tamil","Noto Sans Bengali","Noto Sans Malayalam","Noto Sans Kannada","Noto Sans Gujarati","Noto Sans Gurmukhi","Noto Sans Oriya","Noto Nastaliq Urdu",sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;transition:background-color .3s,color .3s}*{box-sizing:border-box;padding:0;margin:0}a{color:inherit;text-decoration:none}h1,h2,h3,h4,h5,h6{color:var(--text-primary)}div,p,span{color:var(--text-secondary)}input,select,textarea{background-color:var(--input-bg);color:var(--text-primary);border:1px solid var(--border-color);border-radius:6px}[class=dark] select{background-image:url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23ededed%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E")!important}.app-container img{max-width:100%}[class=dark] .recharts-text{fill:var(--text-secondary)!important}[class=dark] .recharts-legend-item-text{color:var(--text-primary)!important}[class=dark] .recharts-cartesian-grid-horizontal line,[class=dark] .recharts-cartesian-grid-vertical line{stroke:var(--border-color)!important}.katex,.markdown-content li,.markdown-content p,.markdown-content span{color:var(--text-primary)!important}.illustration-label .katex,.markdown-content.illustration-label li,.markdown-content.illustration-label p,.markdown-content.illustration-label span{color:inherit!important}[lang=ur]{line-height:2.2!important;padding-top:.2em;padding-bottom:.2em;font-size:1.1em}.custom-slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:6px;background:var(--border-color);border-radius:4px;outline:none;opacity:.9;transition:opacity .2s}.custom-slider:hover{opacity:1}.custom-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--color-primary,#3b82f6);border:2px solid #ffffff;box-shadow:0 1px 4px rgba(0,0,0,.3);cursor:pointer}.custom-slider::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--color-primary,#3b82f6);border:2px solid #ffffff;box-shadow:0 1px 4px rgba(0,0,0,.3);cursor:pointer}:root{--landing-bg:#ffffff;--landing-bg-alt:#f8fafc;--landing-surface:#ffffff;--landing-text:#0f172a;--landing-text-secondary:#475569;--landing-text-muted:#94a3b8;--landing-border:#e2e8f0;--landing-border-light:#f1f5f9;--landing-gradient-start:#2563eb;--landing-gradient-mid:#7c3aed;--landing-gradient-end:#0d9488;--glass-bg:rgba(255,255,255,0.7);--glass-bg-heavy:rgba(255,255,255,0.85);--glass-border:rgba(255,255,255,0.3);--glass-shadow:0 8px 32px rgba(0,0,0,0.08);--landing-glow-primary:rgba(37,99,235,0.15);--landing-glow-secondary:rgba(124,58,237,0.12);--btn-primary-bg:#2563eb;--btn-primary-hover:#1d4ed8;--btn-primary-text:#ffffff;--btn-secondary-bg:transparent;--btn-secondary-border:#cbd5e1;--btn-secondary-text:#334155;--btn-secondary-hover:#f1f5f9;--card-hover-shadow:0 20px 40px rgba(0,0,0,0.08);--card-border-radius:16px;--hero-bg:linear-gradient(135deg,#0a1628,#1e293b 40%,#0f172a);--footer-bg:#0f172a;--footer-text:#cbd5e1;--footer-heading:#f8fafc;--footer-border:#1e293b}[class=dark]{--landing-bg:#0a0a0a;--landing-bg-alt:#111111;--landing-surface:#171717;--landing-text:#f1f5f9;--landing-text-secondary:#94a3b8;--landing-text-muted:#64748b;--landing-border:#27272a;--landing-border-light:#1e1e1e;--glass-bg:rgba(23,23,23,0.75);--glass-bg-heavy:rgba(10,10,10,0.9);--glass-border:rgba(255,255,255,0.08);--glass-shadow:0 8px 32px rgba(0,0,0,0.4);--landing-glow-primary:rgba(59,130,246,0.12);--landing-glow-secondary:rgba(124,58,237,0.10);--btn-primary-bg:#3b82f6;--btn-primary-hover:#2563eb;--btn-primary-text:#ffffff;--btn-secondary-bg:transparent;--btn-secondary-border:#3f3f46;--btn-secondary-text:#d4d4d8;--btn-secondary-hover:#27272a;--card-hover-shadow:0 20px 40px rgba(0,0,0,0.4);--hero-bg:linear-gradient(135deg,#050a14,#0f172a 40%,#020617);--footer-bg:#050505;--footer-text:#94a3b8;--footer-heading:#e2e8f0;--footer-border:#1a1a1a}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes shimmer{0%{background-position:-200%}to{background-position:200%}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}@keyframes floatSlow{0%,to{transform:translateY(0) rotate(0deg)}33%{transform:translateY(-15px) rotate(2deg)}66%{transform:translateY(-8px) rotate(-1deg)}}@keyframes pulseGlow{0%,to{box-shadow:0 0 20px rgba(37,99,235,.3)}50%{box-shadow:0 0 40px rgba(37,99,235,.6)}}@keyframes gradientShift{0%{background-position:0 50%}50%{background-position:100% 50%}to{background-position:0 50%}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes slideInLeft{0%{opacity:0;transform:translateX(-30px)}to{opacity:1;transform:translateX(0)}}@keyframes countUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1);transition-delay:var(--reveal-delay,0s)}.reveal.revealed{opacity:1;transform:translateY(0)}.reveal-scale{opacity:0;transform:scale(.92);transition:opacity .6s cubic-bezier(.22,1,.36,1),transform .6s cubic-bezier(.22,1,.36,1);transition-delay:var(--reveal-delay,0s)}.reveal-scale.revealed{opacity:1;transform:scale(1)}@media (prefers-reduced-motion:reduce){.reveal,.reveal-scale{opacity:1;transform:none;transition:none}}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/ba9851c3c22cd980-s.woff2) format("woff2");unicode-range:u+0460-052f,u+1c80-1c8a,u+20b4,u+2de0-2dff,u+a640-a69f,u+fe2e-fe2f}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/21350d82a1f187e9-s.woff2) format("woff2");unicode-range:u+0301,u+0400-045f,u+0490-0491,u+04b0-04b1,u+2116}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/c5fe6dc8356a8c31-s.woff2) format("woff2");unicode-range:u+1f??}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/19cfc7226ec3afaa-s.woff2) format("woff2");unicode-range:u+0370-0377,u+037a-037f,u+0384-038a,u+038c,u+038e-03a1,u+03a3-03ff}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/df0a9ae256c0569c-s.woff2) format("woff2");unicode-range:u+0102-0103,u+0110-0111,u+0128-0129,u+0168-0169,u+01a0-01a1,u+01af-01b0,u+0300-0301,u+0303-0304,u+0308-0309,u+0323,u+0329,u+1ea0-1ef9,u+20ab}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/8e9860b6e62d6359-s.woff2) format("woff2");unicode-range:u+0100-02ba,u+02bd-02c5,u+02c7-02cc,u+02ce-02d7,u+02dd-02ff,u+0304,u+0308,u+0329,u+1d00-1dbf,u+1e00-1e9f,u+1ef2-1eff,u+2020,u+20a0-20ab,u+20ad-20c0,u+2113,u+2c60-2c7f,u+a720-a7ff}@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/_next/static/media/e4af272ccee01ff0-s.p.woff2) format("woff2");unicode-range:u+00??,u+0131,u+0152-0153,u+02bb-02bc,u+02c6,u+02da,u+02dc,u+0304,u+0308,u+0329,u+2000-206f,u+20ac,u+2122,u+2191,u+2193,u+2212,u+2215,u+feff,u+fffd}@font-face{font-family:Inter Fallback;src:local("Arial");ascent-override:90.44%;descent-override:22.52%;line-gap-override:0.00%;size-adjust:107.12%}.__className_f367f3{font-family:Inter,Inter Fallback;font-style:normal}.__variable_f367f3{--font-inter:"Inter","Inter Fallback"}