@import "https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap";:root{--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-heading:"Outfit", sans-serif;--font-mono:"Fira Code", source-code-pro, Menlo, Monaco, Consolas, monospace;--bg-app:#f1f5f9;--bg-card:#fff;--bg-input:#f8fafc;--bg-sidebar:#fff;--bg-navbar:#fffffff2;--border-subtle:#cbd5e1;--border-focus:#4f46e5;--text-main:#334155;--text-muted:#64748b;--text-bright:#0f172a;--brand-primary:#f9931f;--brand-primary-hover:#e07d0f;--brand-secondary:#1e293b;--color-success:#10b981;--color-error:#ef4444;--color-warning:#f59e0b;--color-info:#3b82f6;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-lg:0 10px 15px -3px #0000000a, 0 4px 6px -2px #00000005;--shadow-xl:0 20px 25px -5px #0000000f, 0 10px 10px -5px #00000005;--navbar-height:70px;--sidebar-width:280px;--radius-sm:6px;--radius-md:12px;--radius-lg:16px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-app);color:var(--text-main);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6}a{color:inherit;text-decoration:none}input,button,select,textarea{font-family:inherit}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-bright);letter-spacing:-.02em;font-weight:700}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-app)}::-webkit-scrollbar-thumb{background:var(--bg-input);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app-container{flex-direction:column;min-height:100vh;display:flex}.glass-panel{-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-subtle);border-radius:var(--radius-md);box-shadow:var(--shadow-md);background:#fffc}.btn{border-radius:var(--radius-sm);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:.95rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-hover) 100%);color:#fff;box-shadow:0 4px 14px #f9931f66}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #f9931f99}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-input);color:var(--text-main);border:1px solid var(--border-subtle)}.btn-secondary:hover{color:var(--text-bright);background:#0000000a}.btn-success{background:var(--color-success);color:#fff}.btn-success:hover{background:#059669}.btn-danger{background:var(--color-error);color:#fff}.btn-danger:hover{background:#dc2626}.note-box{border-left:4px solid var(--color-info);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#3b82f61a;margin:20px 0;padding:15px}.warning-box{border-left:4px solid var(--color-warning);border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:#f59e0b1a;margin:20px 0;padding:15px}pre{border:1px solid var(--border-subtle);border-radius:var(--radius-sm);background:#f8fafc;margin:20px 0;padding:15px;overflow-x:auto}code{font-family:var(--font-mono);color:#0369a1;font-size:.9rem}.grid{gap:20px;display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (width<=1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (width<=640px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}}.global-footer{background-color:var(--bg-card);border-top:1px solid var(--border-subtle);color:var(--text-muted);margin-top:auto;padding:24px 16px;font-size:.9rem}.footer-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;max-width:1200px;margin:0 auto;display:flex}.footer-links{gap:20px;display:flex}.footer-links a{color:var(--text-muted);font-weight:500;transition:color .2s}.footer-links a:hover{color:var(--brand-primary)}.spinner{border:3px solid var(--border-subtle);border-top-color:var(--brand-primary);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.global-header{min-height:var(--navbar-height);background-color:var(--bg-navbar);border-bottom:1px solid var(--border-subtle);z-index:100;-webkit-backdrop-filter:blur(12px);justify-content:space-between;align-items:center;padding:10px 24px;transition:all .3s;display:flex;position:sticky;top:0;box-shadow:0 4px 12px #0f172a0d}.global-header .logo-container{align-items:center;display:flex}.global-header .logo{align-items:center;gap:2px;font-size:1.4rem;font-weight:800;display:flex}.global-header .logo-gradient{background:linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-hover) 100%);-webkit-text-fill-color:transparent;font-family:var(--font-heading);-webkit-background-clip:text}.global-header .logo-sub{color:var(--brand-secondary);font-family:var(--font-heading)}.global-header .search-form{flex:0 450px;position:relative}.global-header .search-wrapper{background-color:var(--bg-input);border:1px solid var(--border-subtle);border-radius:8px;align-items:center;padding:0 12px;transition:border-color .2s;display:flex}.global-header .search-wrapper:focus-within{border-color:var(--border-focus)}.global-header .search-icon{color:var(--text-muted);margin-right:8px}.global-header .search-input{width:100%;height:38px;color:var(--text-bright);background:0 0;border:none;outline:none;font-size:.9rem}.global-header .dropdown{background-color:var(--bg-card);border:1px solid 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.logout-btn{color:var(--color-error);cursor:pointer;background:0 0;border:none;border-radius:6px;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;font-weight:600;transition:background-color .2s;display:flex}.global-header .logout-btn:hover{background-color:#ef44440d}.lesson-container{background-color:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border-subtle);width:95%;max-width:1150px;margin:24px auto;padding:32px 40px;transition:all .2s;box-shadow:0 4px 6px -1px #0000000d,0 2px 4px -1px #00000005}.lesson-markdown ul,.lesson-markdown ol{margin:12px 0;padding-left:20px}.lesson-markdown li{margin-bottom:8px}.mobile-sidebar-active{z-index:100!important;height:100%!important;transition:all .3s!important;position:absolute!important;top:0!important;left:0!important;box-shadow:6px 0 20px #00000026!important}.content-area{height:calc(100vh - var(--navbar-height) - 48px);background-color:var(--bg-app);flex:1;overflow-y:auto}@media (width<=768px){.global-header{flex-wrap:wrap;gap:12px;padding:12px 16px}.global-header .search-form{flex:100%;order:3;margin-top:4px}.global-header .nav-actions{order:2}.global-header .logo-container{order:1}.global-header .user-profile{gap:8px}.global-header .profile-btn span,.global-header .admin-btn span,.global-header .logout-btn span,.global-header .user-info{display:none}.global-header .profile-btn,.global-header .admin-btn,.global-header .logout-btn{border-radius:50%;padding:8px}.lesson-container{border-radius:var(--radius-md);width:98%;margin:12px auto;padding:20px 16px}.content-area{height:calc(100vh - var(--navbar-height) - 100px)!important}}@media (width<=480px){.global-header .auth-buttons{gap:8px}.global-header .login-link{font-size:.85rem}.global-header .register-btn{padding:6px 12px;font-size:.8rem}}.landing-hero{text-align:center;border-radius:var(--radius-lg);border:1px solid var(--border-subtle);background:linear-gradient(135deg,#6366f10a 0%,#06b6d40a 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#0003}.playground-header{border-bottom:1px solid var(--border-subtle);background-color:#0f172a;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.playground-window-dots{align-items:center;gap:8px;display:flex}.playground-window-dots .dot{border-radius:50%;width:12px;height:12px;display:inline-block}.playground-window-dots .dot-red{background-color:#ef4444}.playground-window-dots .dot-yellow{background-color:#eab308}.playground-window-dots .dot-green{background-color:#22c55e}.playground-tabs{background-color:#ffffff0d;border:1px solid #ffffff0d;border-radius:8px;gap:6px;padding:4px;display:flex}.playground-tab{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:6px;padding:6px 16px;font-size:.85rem;font-weight:600;transition:all .2s}.playground-tab.active{background-color:var(--brand-primary);color:#fff}.playground-run-btn{border:none;align-items:center;gap:6px;font-weight:700;transition:transform .2s,background-color .2s;display:flex;background-color:var(--brand-primary)!important;color:#fff!important}.playground-run-btn:hover{filter:brightness(1.1);transform:translateY(-1px)}.playground-body{grid-template-columns:1.1fr .9fr;height:420px;display:grid}.playground-editor-pane{border-right:1px solid var(--border-subtle);background-color:#0b0f19;flex-direction:column;display:flex}.playground-textarea{width:100%;font-family:var(--font-mono);color:#f1f5f9;resize:none;tab-size:2;background-color:#0b0f19;border:none;outline:none;flex:1;padding:20px;font-size:.9rem;line-height:1.5}.playground-preview-pane{background-color:#fff;flex-direction:column;display:flex}.playground-browser-bar{background-color:#f1f5f9;border-bottom:1px solid #e2e8f0;align-items:center;padding:8px 16px;display:flex}.browser-address{color:#64748b;width:100%;font-size:.78rem;font-family:var(--font-sans);background-color:#fff;border:1px solid #cbd5e1;border-radius:6px;align-items:center;gap:8px;padding:4px 12px;display:flex}.browser-lock-icon{color:#10b981;font-size:.85rem}.playground-iframe{background-color:#fff;border:none;flex:1;width:100%;height:100%}.features-section{border-top:1px solid var(--border-subtle);padding:56px 0}.features-grid{grid-template-columns:repeat(3,1fr);gap:32px;margin-top:40px;display:grid}.feature-card{background-color:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);text-align:center;padding:32px 24px;transition:all .2s}.feature-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.feature-icon-wrapper{width:56px;height:56px;color:var(--brand-primary);background-color:#6366f114;border-radius:12px;justify-content:center;align-items:center;margin:0 auto 20px;display:flex}.feature-card-title{margin-bottom:12px;font-size:1.2rem;font-weight:700}.feature-card-desc{color:var(--text-muted);font-size:.92rem;line-height:1.5}.cta-banner{background:linear-gradient(135deg, var(--brand-primary) 0%, #3b82f6 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h2{font-size:1.7rem}}.sidebar-lessons-list{scrollbar-width:thin;scrollbar-color:var(--brand-primary) transparent}.sidebar-lessons-list::-webkit-scrollbar{width:6px}.sidebar-lessons-list::-webkit-scrollbar-track{background:0 0}.sidebar-lessons-list::-webkit-scrollbar-thumb{background-color:var(--brand-primary);border-radius:3px}.sidebar-lessons-list::-webkit-scrollbar-thumb:hover{background-color:var(--brand-primary-hover)}