:root{--primary-color:#2563eb;--primary-hover:#1d4ed8;--primary-light:#dbeafe;--secondary-color:#64748b;--accent-color:#f59e0b;--success-color:#10b981;--warning-color:#f59e0b;--error-color:#ef4444;--info-color:#3b82f6;--dark-bg:#0f172a;--dark-surface:#1e293b;--dark-text:#f8fafc;--dark-text-secondary:#cbd5e1;--font-primary:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--font-secondary:'JetBrains Mono','Fira Code','Courier New',monospace;--font-size-xs:.75rem;--font-size-sm:.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--shadow-sm:0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md:0 4px 6px -1px rgb(0 0 0 / .1),0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg:0 10px 15px -3px rgb(0 0 0 / .1),0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl:0 20px 25px -5px rgb(0 0 0 / .1),0 8px 10px -6px rgb(0 0 0 / .1);--radius-sm:.25rem;--radius-md:.375rem;--radius-lg:.5rem;--radius-xl:.75rem;--radius-2xl:1rem;--transition-fast:150ms ease-in-out;--transition-normal:250ms ease-in-out;--transition-slow:350ms ease-in-out;}body{font-family:var(--font-primary);line-height:1.6;color:#374151;background-color:#ffffff;transition:background-color var(--transition-normal);}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;margin-bottom:var(--space-4);color:#111827;}h1{font-size:var(--font-size-4xl);background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}h2{font-size:var(--font-size-3xl);color:#1f2937;position:relative;}h2::after{content:'';position:absolute;bottom:-8px;left:0;width:60px;height:3px;background:linear-gradient(90deg,var(--primary-color),var(--accent-color));border-radius:var(--radius-lg);}h3{font-size:var(--font-size-2xl);color:#374151;}a{color:var(--primary-color);text-decoration:none;transition:all var(--transition-fast);}a:hover{color:var(--primary-hover);text-decoration:underline;text-decoration-color:var(--primary-color);text-decoration-thickness:2px;text-underline-offset:3px;}.card{background:#ffffff;border:1px solid #e5e7eb;border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);overflow:hidden;position:relative;}.card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-color),var(--accent-color));opacity:0;transition:opacity var(--transition-normal);}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl);border-color:var(--primary-light);}.card:hover::before{opacity:1;}.card-header{padding:var(--space-6);border-bottom:1px solid #f3f4f6;background:linear-gradient(135deg,#ffffff,#f9fafb);}.card-body{padding:var(--space-6);}.card-title{font-size:var(--font-size-xl);font-weight:600;color:#111827;margin-bottom:var(--space-2);}.card-text{color:#6b7280;line-height:1.6;}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-weight:500;font-size:var(--font-size-sm);border-radius:var(--radius-lg);transition:all var(--transition-fast);cursor:pointer;border:none;text-decoration:none;position:relative;overflow:hidden;}.btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left var(--transition-normal);}.btn:hover::before{left:100%;}.btn-primary{background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));color:white;box-shadow:var(--shadow-md);}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);color:white;text-decoration:none;}.btn-secondary{background:white;color:var(--primary-color);border:2px solid var(--primary-color);}.btn-secondary:hover{background:var(--primary-color);color:white;transform:translateY(-2px);box-shadow:var(--shadow-lg);}.btn-outline{background:transparent;color:var(--primary-color);border:1px solid var(--primary-color);}.btn-outline:hover{background:var(--primary-color);color:white;}.navbar{background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(229,231,235,.5);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);}.navbar-brand{font-weight:700;font-size:var(--font-size-xl);background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}.nav-link{font-weight:500;color:#374151;padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);transition:all var(--transition-fast);position:relative;}.nav-link::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--primary-color);transition:all var(--transition-fast);transform:translateX(-50%);}.nav-link:hover,.nav-link.active{color:var(--primary-color);background:var(--primary-light);}.nav-link:hover::after,.nav-link.active::after{width:80%;}.form-control{border:2px solid #e5e7eb;border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4);font-size:var(--font-size-base);transition:all var(--transition-fast);background:#ffffff;}.form-control:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(37,99,235,.1);outline:none;}.form-label{font-weight:500;color:#374151;margin-bottom:var(--space-2);}.hero-section{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white;padding:var(--space-16) 0;position:relative;overflow:hidden;}.hero-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 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var(--transition-normal);height:100%;display:flex;flex-direction:column;}.blog-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);}.blog-image{width:100%;height:200px;object-fit:cover;transition:transform var(--transition-normal);}.blog-card:hover .blog-image{transform:scale(1.05);}.blog-content{padding:var(--space-6);flex:1;display:flex;flex-direction:column;}.blog-title{font-size:var(--font-size-lg);font-weight:600;margin-bottom:var(--space-3);color:#111827;}.blog-excerpt{color:#6b7280;margin-bottom:var(--space-4);flex:1;}.blog-meta{display:flex;align-items:center;gap:var(--space-4);font-size:var(--font-size-sm);color:#9ca3af;margin-bottom:var(--space-4);}.blog-author{display:flex;align-items:center;gap:var(--space-2);}.blog-date{display:flex;align-items:center;gap:var(--space-2);}.quiz-container{background:white;border-radius:var(--radius-xl);padding:var(--space-8);box-shadow:var(--shadow-lg);margin:var(--space-8) 0;}.quiz-progress{background:#f3f4f6;height:8px;border-radius:var(--radius-lg);overflow:hidden;margin-bottom:var(--space-8);}.quiz-progress-bar{background:linear-gradient(90deg,var(--primary-color),var(--accent-color));height:100%;transition:width var(--transition-normal);border-radius:var(--radius-lg);}.quiz-question{font-size:var(--font-size-xl);font-weight:600;margin-bottom:var(--space-6);color:#111827;}.quiz-option{background:white;border:2px solid #e5e7eb;border-radius:var(--radius-lg);padding:var(--space-4);margin-bottom:var(--space-3);cursor:pointer;transition:all var(--transition-fast);}.quiz-option:hover{border-color:var(--primary-color);background:var(--primary-light);}.quiz-option.selected{border-color:var(--primary-color);background:var(--primary-color);color:white;}.quiz-option.correct{border-color:var(--success-color);background:#dcfce7;color:#166534;}.quiz-option.incorrect{border-color:var(--error-color);background:#fee2e2;color:#991b1b;}.footer{background:linear-gradient(135deg,#1f2937,#111827);color:white;padding:var(--space-16) 0 var(--space-8) 0;margin-top:var(--space-16);}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--space-8);margin-bottom:var(--space-8);}.footer-section h4{color:white;margin-bottom:var(--space-4);}.footer-section a{color:#d1d5db;display:block;margin-bottom:var(--space-2);transition:color var(--transition-fast);}.footer-section a:hover{color:var(--primary-color);}.footer-bottom{border-top:1px solid #374151;padding-top:var(--space-6);text-align:center;color:#9ca3af;}.text-gradient{background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}.bg-gradient{background:linear-gradient(135deg,var(--primary-color),var(--accent-color));}.glass{background:rgba(255,255,255,.1);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);}.animate-float{animation:float 3s ease-in-out infinite;}@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}.animate-fade-in{animation:fadeIn .6s ease-out;}@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.animate-slide-up{animation:slideUp .6s ease-out;}@keyframes slideUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@media (prefers-color-scheme:dark){:root{--primary-light:#1e40af}body{background-color:var(--dark-bg);color:var(--dark-text)}.card{background:var(--dark-surface);border-color:#374151;color:var(--dark-text)}.navbar{background:rgba(15,23,42,.95);border-bottom-color:rgba(55,65,81,.5)}.form-control{background:var(--dark-surface);border-color:#374151;color:var(--dark-text)}.form-control:focus{border-color:var(--primary-color)}}@media (max-width:768px){:root{--font-size-4xl:2rem;--font-size-3xl:1.5rem;--space-16:3rem;--space-12:2rem}.hero-section{padding:var(--space-12) 0}.content-section{padding:var(--space-12) 0}.card-body{padding:var(--space-4)}.btn{padding:var(--space-2) var(--space-4);font-size:var(--font-size-xs)}}@media (max-width:480px){.footer-content{grid-template-columns:1fr}.blog-meta{flex-direction:column;align-items:flex-start;gap:var(--space-2)}}@media 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