:root{--color-primary:#6366f1;--color-primary-hover:#4f46e5;--color-primary-light:#e0e7ff;--bg-primary:#ffffff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--border-color:#e2e8f0;--font-sans:'Inter', system-ui, -apple-system, sans-serif;--shadow-sm:0 1px 3px rgba(0, 0, 0, 0.1);--shadow-md:0 4px 6px -1px rgba(0, 0, 0, 0.1);--shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.1);--shadow-xl:0 20px 25px -5px rgba(0, 0, 0, 0.1);--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-2xl:1.5rem;--radius-full:9999px;--transition-fast:150ms ease;--transition-base:200ms ease}[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#334155;--color-primary-light:rgba(99, 102, 241, 0.2)}[data-theme=dark] .icon-sun{display:none}[data-theme=dark] .icon-moon{display:block}[data-theme=light] .icon-sun{display:block}[data-theme=light] .icon-moon{display:none}*,*::before,*::after{box-sizing:border-box;margin:0}html{scroll-behavior:smooth;overflow-x:hidden}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer;background:0 0;border:none}img{max-width:100%;display:block}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.main-content{position:relative;z-index:1}.landing-header{position:fixed;top:0;left:0;right:0;z-index:9999;background-color:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-color)}[data-theme=dark] .landing-header{background-color:rgba(15,23,42,.95)}.landing-nav{display:flex;align-items:center;justify-content:space-between;height:72px}.landing-logo{display:flex;align-items:center;gap:.75rem;z-index:2100}.logo-image{width:32px;height:32px;flex-shrink:0}.logo-text{font-size:1.25rem;font-weight:700;color:var(--text-primary);line-height:1}.mobile-menu-toggle{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:var(--radius-md);color:var(--text-primary);background:var(--bg-tertiary);z-index:2100}.mobile-menu-toggle svg line{transition:.3s}.is-nav-open .mobile-menu-toggle .line-mid{opacity:0}.is-nav-open .mobile-menu-toggle .line-top{transform:translateY(6px)rotate(45deg);transform-origin:center}.is-nav-open .mobile-menu-toggle .line-bot{transform:translateY(-6px)rotate(-45deg);transform-origin:center}.nav-links-desktop{display:none}@media(min-width:1024px){.nav-links-desktop{display:flex}.nav-links-desktop .nav-links{display:flex;flex-direction:row;align-items:center;gap:.5rem}.nav-links-desktop .nav-link{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9375rem;font-weight:600;color:var(--text-secondary);border-radius:var(--radius-lg)}.nav-links-desktop .nav-link:hover{color:var(--text-primary);background-color:var(--bg-tertiary)}.nav-links-desktop .nav-link span{display:none}.nav-links-desktop .social-link svg{color:var(--color-primary)}.nav-links-desktop .nav-actions{margin-left:.5rem}.nav-links-desktop .theme-toggle{width:40px;height:40px;display:flex;align-items:center;justify-content:center;padding:0;background:0 0;border-radius:var(--radius-md)}.nav-links-desktop .theme-toggle:hover{background-color:var(--bg-tertiary)}.nav-links-desktop .theme-toggle-label{display:none}.mobile-menu-toggle{display:none}}.mobile-nav-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,.5);z-index:9998;opacity:0;visibility:hidden;transition:opacity 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0}.mobile-nav-theme-toggle{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;font-size:1.125rem;font-weight:600;color:var(--text-primary);background-color:var(--bg-secondary);border-radius:var(--radius-lg);cursor:pointer;transition:background-color .2s ease}.mobile-nav-theme-toggle:hover{background-color:var(--bg-tertiary)}@media(min-width:1024px){.mobile-nav-overlay,.mobile-nav-menu{display:none!important}}[data-theme=dark] #theme-toggle .icon-sun,[data-theme=dark] #theme-toggle .icon-moon,[data-theme=dark] #mobile-theme-toggle .icon-sun,[data-theme=dark] #mobile-theme-toggle .icon-moon{color:#fff}[data-theme=light] #theme-toggle .icon-sun,[data-theme=light] #theme-toggle .icon-moon,[data-theme=light] #mobile-theme-toggle .icon-sun,[data-theme=light] #mobile-theme-toggle .icon-moon{color:var(--text-primary)}.hero-section{padding:8rem 0 4rem;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-primary) 100%)}.hero-section 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.75rem;background-color:var(--bg-tertiary);color:var(--text-secondary);font-size:.75rem;font-weight:600;border-radius:var(--radius-full)}.course-card-header{display:flex;align-items:flex-start;justify-content:space-between;padding:1.5rem 1.5rem 0}.course-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-lg)}.course-icon svg{width:28px;height:28px}.course-meta{display:flex;flex-direction:column;align-items:flex-end;gap:.25rem}.course-difficulty{padding:.125rem .5rem;font-size:.75rem;font-weight:600;border-radius:var(--radius-sm);text-transform:capitalize}.course-difficulty--beginner{background-color:#dcfce7;color:#166534}.course-difficulty--intermediate{background-color:#fef3c7;color:#92400e}.course-difficulty--advanced{background-color:#fee2e2;color:#991b1b}[data-theme=dark] .course-difficulty--beginner{background-color:rgba(34,197,94,.2);color:#4ade80}[data-theme=dark] 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var(--transition-fast)}.course-start-btn:hover{filter:brightness(1.1);transform:translateX(4px)}.course-status{color:var(--text-muted);font-style:italic}.features-section{padding:5rem 0;background-color:var(--bg-secondary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}.feature-card{padding:1.5rem;background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:all var(--transition-base)}.feature-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md)}.feature-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background-color:var(--color-primary-light);color:var(--color-primary);border-radius:var(--radius-lg);margin-bottom:1rem}.feature-icon svg{width:24px;height:24px}.feature-title{font-size:1.125rem;font-weight:600;margin-bottom:.5rem}.feature-description{font-size:.9375rem;color:var(--text-secondary);line-height:1.6}.filter-bar{display:flex;flex-direction:column;gap:1.5rem;margin-bottom:3rem;padding:1.5rem;background-color:var(--bg-secondary);border-radius:var(--radius-xl);border:1px solid var(--border-color)}@media(min-width:768px){.filter-bar{flex-direction:row;align-items:center;justify-content:center;gap:3rem}}.filter-group{display:flex;align-items:center;gap:1rem}.filter-label{font-size:.875rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.filter-options{display:flex;gap:.5rem;flex-wrap:wrap}.filter-btn{padding:.5rem 1rem;font-size:.875rem;font-weight:500;color:var(--text-secondary);background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-full);transition:all 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var(--border-color)}.contributor-name{font-weight:600;color:var(--text-primary)}.learner-count{display:flex;align-items:center;gap:.5rem;font-size:.8125rem;color:var(--text-muted);margin-bottom:.75rem}.learner-count svg{color:var(--text-muted)}.cookie-banner{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%);width:calc(100% - 3rem);max-width:600px;background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);padding:1.5rem;z-index:1000;display:flex;flex-direction:column;gap:1rem;animation:slideUp .5s ease-out}@media(min-width:768px){.cookie-banner{flex-direction:row;align-items:center;justify-content:space-between}}@keyframes slideUp{from{transform:translate(-50%,100%);opacity:0}to{transform:translate(-50%,0);opacity:1}}.cookie-content p{font-size:.875rem;color:var(--text-secondary)}.cookie-actions{display:flex;gap:.75rem}.cookie-btn{padding:.5rem 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.3s}.prose{max-width:800px;margin:0 auto;padding:8rem 1.5rem 4rem}.prose h1{font-size:3rem;font-weight:800;margin-bottom:2rem;color:var(--text-primary)}.prose h2{font-size:1.75rem;font-weight:700;margin:2.5rem 0 1rem;color:var(--text-primary)}.prose p{margin-bottom:1.5rem;color:var(--text-secondary);line-height:1.8}.prose ul{margin-bottom:1.5rem;padding-left:1.5rem;list-style:disc}.prose li{margin-bottom:.5rem;color:var(--text-secondary)}.prose a{color:var(--color-primary);text-decoration:underline}.landing-footer{position:relative;z-index:1;padding:4rem 0 2rem;background-color:var(--bg-secondary);border-top:1px solid var(--border-color)}.footer-content{display:grid;grid-template-columns:1fr;gap:2rem;margin-bottom:3rem}@media(min-width:768px){.footer-content{grid-template-columns:2fr 1fr 1fr}}.footer-brand .footer-logo{display:flex;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem}.footer-logo-image{width:24px;height:24px}.footer-tagline{font-size:.9375rem;color:var(--text-secondary);line-height:1.6;max-width:300px}.footer-links-title{font-size:.875rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:1rem}.footer-links{list-style:none;padding:0;display:flex;flex-direction:column;gap:.75rem}.footer-links a{font-size:.9375rem;color:var(--text-secondary);transition:color var(--transition-fast)}.footer-links a:hover{color:var(--color-primary)}.footer-bottom{padding-top:2rem;border-top:1px solid var(--border-color);display:flex;flex-direction:column;gap:.5rem;text-align:center}@media(min-width:640px){.footer-bottom{flex-direction:row;justify-content:space-between}}.footer-copyright,.footer-credits{font-size:.875rem;color:var(--text-muted)}@media(max-width:640px){.hero-section{padding:6rem 0 3rem}.hero-stats{gap:1.5rem}.filter-group{flex-direction:column;align-items:flex-start;gap:.5rem}.filter-bar{padding:1rem;gap:1rem}.courses-grid{grid-template-columns:1fr}.features-grid{grid-template-columns:1fr}}