:root{--primary:#4F46E5;--primary-dark:#4338CA;--primary-light:#6366F1;--accent:#F59E0B;--accent-dark:#D97706;--accent-light:#FCD34D;--gradient-primary:linear-gradient(135deg,#4F46E5,#2563EB);--gradient-hero:linear-gradient(135deg,#4F46E5,#3B82F6 50%,#2563EB);--gradient-subtle:linear-gradient(135deg,rgba(79,70,229,0.08),rgba(37,99,235,0.08));--text-dark:#1e293b;--text-primary:#1e293b;--text-secondary:#475569;--text-muted:#64748b;--text-light:#94a3b8;--bg-light:#f8fafc;--bg-white:#ffffff;--bg-dark:#1e293b;--success:#10b981;--success-dark:#059669;--success-light:#d1fae5;--error:#ef4444;--error-dark:#dc2626;--error-light:#fee2e2;--warning:#f59e0b;--warning-dark:#d97706;--warning-light:#fef3c7;--gray-50:#f8fafc;--gray-100:#f1f5f9;--gray-200:#e2e8f0;--gray-300:#cbd5e1;--gray-400:#94a3b8;--gray-500:#64748b;--gray-600:#475569;--gray-700:#334155;--gray-800:#1e293b;--gray-900:#0f172a;--shadow-sm:0 1px 3px rgba(0,0,0,0.1);--shadow-md:0 4px 12px rgba(0,0,0,0.1);--shadow-lg:0 10px 30px rgba(0,0,0,0.12);--shadow-glow:0 4px 14px rgba(79,70,229,0.25);--radius-sm:8px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-full:9999px;--transition-fast:0.15s ease;--transition-base:0.2s ease;--transition-slow:0.3s ease}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body,html{max-width:100vw;overflow-x:hidden;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.6;color:var(--text-dark);background-color:var(--bg-light);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overscroll-behavior-y:contain;-webkit-tap-highlight-color:transparent}@media (max-width:768px){main{padding-bottom:calc(70px + env(safe-area-inset-bottom, 0px))!important}}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;margin-bottom:.5rem;color:var(--text-dark);letter-spacing:-.02em}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}h4{font-size:1.25rem}p{margin-bottom:1rem;color:var(--text-muted)}a{color:var(--primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary-dark)}button{cursor:pointer;font-family:inherit;font-size:1rem;border:none;outline:none}button:disabled{opacity:.6;cursor:not-allowed}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.875rem 1.75rem;font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-base)}.btn-primary{background:var(--primary);color:white;box-shadow:var(--shadow-glow)}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(79,70,229,.35)}.btn-secondary{background:var(--bg-white);color:var(--primary);border:2px solid var(--primary)}.btn-secondary:hover:not(:disabled){background:var(--primary);color:white}.btn-ghost{background:transparent;color:var(--primary);padding:.5rem 1rem}.btn-ghost:hover:not(:disabled){background:var(--gradient-subtle)}input,select,textarea{font-family:inherit;font-size:1rem;padding:.875rem 1rem;border:2px solid var(--gray-200);border-radius:var(--radius-md);width:100%;background:var(--bg-white);color:var(--text-dark);transition:all var(--transition-fast)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.12)}input::placeholder,textarea::placeholder{color:var(--gray-400)}.card{background:var(--bg-white);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm);transition:all var(--transition-base)}.card:hover{box-shadow:var(--shadow-md)}.main-content{flex:1 1;padding-top:1rem;padding-bottom:3rem;min-height:calc(100vh - 70px)}.container{max-width:1200px;width:100%;margin:0 auto;padding:0 1.5rem}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes spin{to{transform:rotate(1turn)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.skeleton{background:linear-gradient(90deg,var(--gray-200) 25%,var(--gray-300) 37%,var(--gray-200) 63%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}.fade-in{animation:fadeIn .3s ease-out forwards}.success-message{background:var(--success-light);color:#065f46;border-left:4px solid var(--success)}.error-message,.success-message{padding:1rem;border-radius:var(--radius-md)}.error-message{background:var(--error-light);color:#991b1b;border-left:4px solid var(--error)}.text-gradient{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.text-accent{color:var(--accent)}.bg-gradient{background:var(--gradient-primary)}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}@media (max-width:768px){html{font-size:15px}h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.375rem}.container{padding:0 1rem}.main-content{padding-top:.5rem;padding-bottom:2rem}.btn{padding:.75rem 1.5rem;width:100%}}@media (max-width:480px){h1{font-size:1.75rem}h2{font-size:1.5rem}}ol,ul{margin-bottom:1rem;padding-left:1.5rem}.answer-button{display:block;width:100%;padding:1rem;margin:.5rem 0;background:var(--bg-white);border:2px solid var(--gray-200);border-radius:var(--radius-md);font-size:1rem;text-align:left;cursor:pointer;transition:all var(--transition-fast)}.answer-button:hover:not(:disabled){border-color:var(--primary);background:var(--gradient-subtle)}.answer-button.correct{background:var(--success-light);border-color:var(--success)}.answer-button.wrong{background:var(--error-light);border-color:var(--error)}@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}