:root{--color-primary:#0ea5e9;--color-primary-dark:#0284c7;--color-primary-light:#0ea5e926;--color-secondary:#10b981;--color-secondary-light:#10b98126;--color-accent:#f59e0b;--color-accent-light:#f59e0b26;--color-danger:#ef4444;--color-danger-light:#ef444426;--color-purple:#8b5cf6;--color-purple-light:#8b5cf626;--bg-background:#0b1120;--bg-surface:#131c31;--bg-surface-hover:#1e293b;--bg-elevated:#1a2540;--text-primary:#f0f4f8;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#1e3050;--border-color-light:#ffffff0f;--nav-bg:#0b1120e0;--glow-primary:0 0 20px #0ea5e933;--glow-secondary:0 0 20px #10b98126;--shadow-sm:0 1px 3px #0000004d;--shadow-md:0 4px 14px #0000004d;--shadow-lg:0 10px 30px #0006;--shadow-xl:0 20px 50px #00000080;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--spacing-3xl:4rem;--radius-sm:.375rem;--radius-md:.625rem;--radius-lg:1rem;--radius-xl:1.25rem;--radius-2xl:1.5rem;--radius-full:9999px;--transition-fast:.15s ease;--transition-normal:.3s ease;--transition-slow:.5s ease;--safe-area-top:env(safe-area-inset-top,0px);--safe-area-bottom:env(safe-area-inset-bottom,0px);--safe-area-left:env(safe-area-inset-left,0px);--safe-area-right:env(safe-area-inset-right,0px)}[data-theme=light]{--bg-background:#f0f4f8;--bg-surface:#fff;--bg-surface-hover:#f1f5f9;--bg-elevated:#f8fafc;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--border-color:#e2e8f0;--border-color-light:#0000000d;--nav-bg:#ffffffe0;--glow-primary:0 0 20px #0ea5e91f;--glow-secondary:0 0 20px #10b9811a;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 14px #00000014;--shadow-lg:0 10px 30px #0000001a;--shadow-xl:0 20px 50px #0000001f}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:var(--bg-background);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color var(--transition-normal),color var(--transition-normal);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}.container{max-width:1200px;padding:0 var(--spacing-lg);margin:0 auto}.btn{border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);color:var(--text-primary);letter-spacing:.01em;border:none;outline:none;justify-content:center;align-items:center;gap:.5rem;padding:.6rem 1.25rem;font-family:inherit;font-size:.875rem;font-weight:600;display:inline-flex;position:relative;overflow:hidden}.btn:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.btn:active{transform:translateY(0)}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;box-shadow:0 2px 8px #0ea5e94d}.btn-primary:hover{background:linear-gradient(135deg,#38bdf8,var(--color-primary));box-shadow:0 4px 16px #0ea5e966}.btn-secondary{background:var(--bg-surface-hover);border:1px solid var(--border-color)}.btn-secondary:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.btn-danger{background:linear-gradient(135deg,var(--color-danger),#dc2626);color:#fff}.btn-lg{border-radius:var(--radius-lg);padding:.85rem 2rem;font-size:1.05rem}.card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);transition:all var(--transition-normal);position:relative}.card-hover:hover{box-shadow:var(--shadow-lg);border-color:#0ea5e94d;transform:translateY(-4px)}.card-glass{-webkit-backdrop-filter:blur(12px);border-radius:var(--radius-lg);padding:var(--spacing-lg);transition:all var(--transition-normal);background:#131c3199;border:1px solid #ffffff1a;box-shadow:0 8px 32px #0000004d}[data-theme=light] .card-glass{background:#ffffffb3;border:1px solid #00000014}.card-glass:hover{border-color:#0ea5e94d;transform:translateY(-6px);box-shadow:0 12px 40px #0006}.feature-card{transform-style:preserve-3d;perspective:1000px;transition:all .4s cubic-bezier(.34,1.56,.64,1)}.feature-card:hover{box-shadow:var(--shadow-xl),var(--glow-primary);border-color:#0ea5e966;transform:translateY(-8px)rotateX(2deg)rotateY(-2deg)}.input,select,textarea{background-color:var(--bg-background);border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition-fast);padding:.75rem 1rem;font-family:inherit;font-size:.9rem}.input:hover,select:hover,textarea:hover{border-color:var(--text-muted)}.input:focus,select:focus,textarea:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #0ea5e926}.input::placeholder{color:var(--text-muted)}select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8.825L1.175 4 2.238 2.938 6 6.7 9.763 2.937 10.825 4z'/%3E%3C/svg%3E");background-position:right .75rem center;background-repeat:no-repeat;padding-right:2.5rem}.badge{border-radius:var(--radius-full);letter-spacing:.02em;align-items:center;padding:.2rem .75rem;font-size:.8rem;font-weight:600;display:inline-flex}.badge-easy{background:var(--color-secondary-light);color:var(--color-secondary)}.badge-medium{background:var(--color-accent-light);color:var(--color-accent)}.badge-hard{background:var(--color-danger-light);color:var(--color-danger)}.badge-tag{background:var(--bg-surface-hover);color:var(--text-secondary);border:1px solid var(--border-color);transition:all var(--transition-fast);font-weight:500}.badge-tag:hover{border-color:var(--color-primary);color:var(--color-primary)}.progress-bar{background:var(--bg-surface-hover);border-radius:var(--radius-full);height:8px;position:relative;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg,var(--color-primary)0%,var(--color-secondary)50%,var(--color-primary)100%);border-radius:var(--radius-full);background-size:200% 100%;height:100%;transition:width .4s cubic-bezier(.34,1.56,.64,1);animation:2s linear infinite progressShine;position:relative}.progress-bar-fill:after{content:"";background:linear-gradient(90deg,#0000 0%,#ffffff4d 50%,#0000 100%) 0 0/200% 100%;animation:1.5s linear infinite progressShine;position:absolute;inset:0}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes progressShine{0%{background-position:-200%}to{background-position:200%}}@keyframes typingDot{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-4px)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-12px)}}@keyframes floatSlow{0%,to{transform:translateY(0)rotate(0)}50%{transform:translateY(-8px)rotate(2deg)}}@keyframes gradientShift{0%{background-position:0%}50%{background-position:100%}to{background-position:0%}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes bounceIn{0%{opacity:0;transform:scale(.8)}60%{opacity:1;transform:scale(1.05)}to{transform:scale(1)}}.animate-fade-in{animation:fadeIn var(--transition-normal)forwards}.animate-fade-in-up{animation:.5s ease-out forwards fadeInUp}main{animation:.4s ease-out fadeIn}.gradient-text{background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.glass{background:var(--nav-bg);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-color-light)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--bg-surface-hover);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.divider{background:linear-gradient(90deg,transparent,var(--border-color),transparent);height:1px;margin:var(--spacing-lg)0}.skeleton{background:linear-gradient(90deg,var(--bg-surface),var(--bg-surface-hover),var(--bg-surface));border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s infinite shimmer}.grid-2{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.grid-3{grid-template-columns:repeat(3,1fr);gap:1.25rem;display:grid}.grid-4{background:var(--border-color);border-radius:var(--radius-xl);border:1px solid var(--border-color);grid-template-columns:repeat(4,1fr);gap:1px;display:grid;overflow:hidden}.grid-4>*{background:var(--bg-surface)}.grid-auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem;display:grid}.grid-features{grid-template-columns:repeat(2,1fr);gap:1.5rem;max-width:900px;margin:0 auto;display:grid}.page-section{padding:3rem 0}.page-section--hero{padding:5rem 0 3rem}.nav-bar{z-index:100;border-bottom:1px solid var(--border-color);background-color:var(--nav-bg);-webkit-backdrop-filter:blur(16px);transition:all var(--transition-normal);padding:.75rem 0;position:sticky;top:0}.nav-bar--scrolled{-webkit-backdrop-filter:blur(20px);box-shadow:0 4px 20px #00000026}.nav-container{justify-content:space-between;align-items:center;display:flex;position:relative}.nav-logo{letter-spacing:-.02em;align-items:center;gap:.5rem;font-size:1.4rem;font-weight:800;display:flex}.nav-icon-btn{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;color:var(--text-primary);transition:all var(--transition-fast);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;padding:.4rem;font-size:1rem;line-height:1;display:flex}.nav-icon-btn:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.tab-bar{scrollbar-width:none;-webkit-overflow-scrolling:touch;gap:.35rem;padding-bottom:.25rem;display:flex;overflow-x:auto}.tab-bar::-webkit-scrollbar{display:none}.tab-button{border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-surface);color:var(--text-secondary);cursor:pointer;white-space:nowrap;transition:all var(--transition-fast);align-items:center;gap:.35rem;min-height:44px;padding:.6rem 1rem;font-family:inherit;font-size:.82rem;font-weight:500;display:flex}.tab-button:hover{border-color:var(--text-muted);color:var(--text-primary)}.tab-button--active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary);font-weight:600}.tab-content{padding:2rem 2.5rem}.chat-panel{background:var(--bg-surface);z-index:1000;border:1px solid var(--border-color);border-radius:20px;flex-direction:column;animation:.3s cubic-bezier(.34,1.56,.64,1) slideInChat;display:flex;position:fixed;overflow:hidden;box-shadow:0 12px 48px #0006}.chat-panel--closing{animation:.2s ease-in forwards slideOutChat}.chat-panel--global{width:420px;height:620px;bottom:6.5rem;right:2rem}.chat-panel--assistant{width:400px;max-width:calc(100vw - 2rem);height:580px;max-height:calc(100vh - 7rem);bottom:5rem;right:1.5rem}.chat-fab{cursor:pointer;z-index:1000;width:56px;height:56px;transition:all var(--transition-fast);background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;border:none;border-radius:50%;justify-content:center;align-items:center;font-size:1.5rem;display:flex;position:fixed;bottom:2rem;right:2rem;box-shadow:0 4px 20px #0ea5e966}.chat-fab:hover{transform:scale(1.08);box-shadow:0 6px 28px #0ea5e980}.chat-header{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;flex-shrink:0;justify-content:space-between;align-items:center;padding:1rem 1.25rem;display:flex}.chat-messages{flex-direction:column;flex:1;gap:.75rem;padding:1rem;display:flex;overflow-y:auto}.chat-input-form{border-top:1px solid var(--border-color);flex-shrink:0;align-items:flex-end;gap:.5rem;padding:.75rem;display:flex}.material-row{transition:background var(--transition-fast);padding:.7rem 2rem}.material-row:hover{background:var(--bg-surface-hover)}.material-row--topic{padding:.85rem 2rem .4rem}.material-row--section{padding:1.5rem 2rem}.breadcrumbs{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:1.25rem;font-size:.85rem;display:flex}.breadcrumbs a{color:var(--text-muted);transition:color var(--transition-fast)}.breadcrumbs a:hover{color:var(--color-primary)}.breadcrumbs-separator{opacity:.5}.breadcrumbs-current{color:var(--text-primary);font-weight:600}.toast-container{z-index:1100;pointer-events:none;flex-direction:column-reverse;gap:.5rem;display:flex;position:fixed;bottom:1.5rem;right:1.5rem}.toast{pointer-events:auto;border-radius:var(--radius-lg);background:var(--bg-elevated);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);color:var(--text-primary);align-items:center;gap:.6rem;max-width:380px;padding:.85rem 1.25rem;font-size:.9rem;animation:.3s ease-out slideInRight;display:flex}.toast--success{border-left:3px solid var(--color-secondary)}.toast--error{border-left:3px solid var(--color-danger)}.toast--info{border-left:3px solid var(--color-primary)}.skip-link{background:var(--color-primary);color:#fff;border-radius:var(--radius-md);z-index:10000;padding:.75rem 1.5rem;font-weight:600;transition:top .2s;position:absolute;top:-100%;left:1rem}.skip-link:focus{top:1rem}.route-progress{z-index:9999;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));transform-origin:0;height:3px;animation:1.5s ease-in-out routeProgress;position:fixed;top:0;left:0;right:0}.footer{background-color:var(--bg-surface);border-top:1px solid var(--border-color);margin-top:auto;padding:3rem 0 2rem}.footer-brand{align-items:center;gap:.5rem;margin-bottom:.75rem;display:flex}.footer-brand-icon{background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;border-radius:8px;justify-content:center;align-items:center;width:28px;height:28px;font-size:.75rem;font-weight:800;display:flex}.footer-section-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.85rem;font-size:.8rem;font-weight:700}.footer-bottom{color:var(--text-muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;font-size:.8rem;display:flex}.feature-card-inner{text-align:center;cursor:default;flex-direction:column;align-items:center;height:100%;padding:2.5rem 2rem;display:flex;position:relative;overflow:hidden}.hero-cta{flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:3.5rem;display:flex}.social-proof{background:var(--bg-surface);border-radius:var(--radius-xl);border:1px solid var(--border-color);flex-wrap:wrap;justify-content:center;align-items:center;gap:1.5rem;padding:.75rem 1.5rem;display:inline-flex}@keyframes slideInChat{0%{opacity:0;transform:translateY(20px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes slideOutChat{to{opacity:0;transform:translateY(20px)scale(.95)}}@keyframes mobileMenuIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes routeProgress{0%{transform:scaleX(0)}50%{transform:scaleX(.7)}to{transform:scaleX(1)}}.nav-link{transition:background-color var(--transition-fast),color var(--transition-fast)}.nav-link:hover{background-color:var(--bg-surface-hover)!important;color:var(--text-primary)!important}.mobile-menu-btn{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;color:var(--text-primary);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;padding:.4rem;display:none}.nav-links,.nav-actions{align-items:center;gap:.25rem;display:flex}.nav-divider{background:var(--border-color);width:1px;height:20px;margin:0 .5rem}.nav-mobile-dropdown{display:none}.footer-grid{grid-template-columns:2fr 1fr 1fr;gap:3rem;display:grid}.footer-link{color:var(--text-secondary);transition:color var(--transition-fast);align-items:center;min-height:44px;padding:.1rem 0;font-size:.9rem;display:flex}.footer-link:hover{color:var(--color-primary)}.profile-form-grid{grid-template-columns:1fr 1fr;gap:1rem;display:grid}@media (max-width:768px){.container{padding:0 var(--spacing-md)}.mobile-menu-btn{display:flex}.nav-links{display:none}.nav-mobile-dropdown{background:var(--nav-bg);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border-color);z-index:99;flex-direction:column;gap:.25rem;padding:.75rem;animation:.25s ease-out mobileMenuIn;display:flex;position:absolute;top:100%;left:0;right:0}.nav-mobile-dropdown a{text-align:left;width:100%;padding:.65rem 1rem!important}.nav-actions{gap:.25rem}.nav-divider,.nav-action-text{display:none}}@media (min-width:769px) and (max-width:1024px){.grid-3{grid-template-columns:1fr 1fr}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}.card{padding:1.25rem}.page-section{padding:2rem 0}.page-section--hero{padding:3rem 0 2rem}.footer-grid{grid-template-columns:1.5fr 1fr}.tab-content{padding:1.5rem 1.25rem}.chat-panel--global{width:380px;height:560px}.chat-panel--assistant{width:360px;height:520px}.feature-card-inner{padding:2rem 1.5rem}.profile-form-grid{gap:.75rem}}.auth-page{justify-content:center;align-items:center;min-height:calc(100vh - 200px);padding:2rem 1rem;display:flex;position:relative;overflow:hidden}.auth-page:before{content:"";pointer-events:none;background:radial-gradient(circle,#0ea5e914 0%,#0000 70%);border-radius:50%;width:600px;height:600px;position:absolute;top:-40%;right:-20%}.auth-page:after{content:"";pointer-events:none;background:radial-gradient(circle,#10b9810f 0%,#0000 70%);border-radius:50%;width:500px;height:500px;position:absolute;bottom:-30%;left:-15%}.auth-card{z-index:1;width:100%;max-width:440px;position:relative}.auth-card .card{border-radius:var(--radius-2xl);box-shadow:var(--shadow-xl);border-color:var(--border-color-light);padding:2.5rem}.auth-icon{border-radius:18px;justify-content:center;align-items:center;width:64px;height:64px;margin:0 auto 1.5rem;font-size:1.75rem;display:flex}@media (max-width:768px){.container{max-width:100%;padding:0 1rem}body{padding-left:var(--safe-area-left);padding-right:var(--safe-area-right);font-size:.9rem}h1{font-size:1.75rem!important}h2{font-size:1.5rem!important}h3{font-size:1.25rem!important}.card{padding:1rem}.grid-2,.grid-3,.grid-auto,.grid-features{grid-template-columns:1fr}.btn-lg{width:100%;padding:.75rem 1.5rem;font-size:.95rem}.page-section{padding:1.5rem 0}.page-section--hero{padding:2.5rem 0 2rem}.tab-bar{scroll-snap-type:x mandatory}.tab-button{scroll-snap-align:start;min-width:70px;padding:.5rem .75rem;font-size:.75rem}.tab-content{padding:1.25rem 1rem}.chat-panel--global,.chat-panel--assistant{padding-top:var(--safe-area-top);padding-bottom:var(--safe-area-bottom);border-radius:0;inset:0;width:100%!important;height:100%!important}.chat-fab{bottom:calc(1.5rem + var(--safe-area-bottom));right:calc(1.5rem + var(--safe-area-right))}.material-row{padding:.7rem 1.25rem}.material-row--topic{padding:.85rem 1.25rem .4rem}.material-row--section{padding:1rem 1.25rem}.hero-cta{flex-direction:column;align-items:center}.social-proof{gap:.75rem;padding:.6rem 1rem}.feature-card-inner{padding:1.75rem 1.25rem}.auth-page{padding:1.5rem 1rem}.footer-grid{grid-template-columns:1fr;gap:1.75rem}.profile-form-grid{grid-template-columns:1fr}.breadcrumbs{font-size:.8rem}.toast-container{left:1rem;right:1rem;bottom:calc(5rem + var(--safe-area-bottom))}.toast{max-width:100%}}@media (max-width:480px){.auth-card .card{padding:1.75rem 1.25rem}.grid-4{grid-template-columns:repeat(2,1fr)}}@media (hover:none) and (pointer:coarse){.card-hover:hover{box-shadow:none;transform:none}.feature-card:hover{box-shadow:var(--shadow-md);transform:none}.card-hover:active{background:var(--bg-surface-hover)}.btn:hover{transform:none}.btn:active{opacity:.9;transform:scale(.98)}.badge-tag{align-items:center;min-height:36px;display:inline-flex}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.card,.btn,.input,select,textarea,.badge,.nav-bar,.footer{transition:background-color var(--transition-normal),border-color var(--transition-normal),color var(--transition-normal),box-shadow var(--transition-normal)}@keyframes xpFloat{0%{opacity:1;transform:translate(-50%,-50%)scale(1)}to{opacity:0;transform:translate(-50%,-80%)scale(1.3)}}@keyframes achievementUnlock{0%{opacity:0;transform:scale(0)rotate(-180deg)}60%{opacity:1;transform:scale(1.2)rotate(10deg)}to{transform:scale(1)rotate(0)}}@keyframes firePulse{0%,to{filter:brightness();transform:scale(1)}50%{filter:brightness(1.3);transform:scale(1.15)}}@keyframes ringFill{0%{stroke-dashoffset:var(--ring-circumference)}to{stroke-dashoffset:var(--ring-offset)}}@keyframes bubble{0%{opacity:.7;transform:translateY(0)scale(1)}50%{opacity:1;transform:translateY(-15px)scale(1.1)}to{opacity:0;transform:translateY(-30px)scale(.8)}}@keyframes moleculeSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes checkmarkDraw{0%{stroke-dashoffset:24px}to{stroke-dashoffset:0}}@keyframes meshGradient{0%{background-position:0%}50%{background-position:100%}to{background-position:0%}}@keyframes glowPulse{0%,to{box-shadow:0 0 5px #0ea5e933}50%{box-shadow:0 0 20px #0ea5e966}}.noise-overlay:before{content:"";pointer-events:none;z-index:9998;opacity:.02;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E") 0 0/128px 128px;position:fixed;inset:0}.mesh-bg{background:linear-gradient(-45deg,#0ea5e91f,#10b9811f,#8b5cf61f,#f59e0b14) 0 0/400% 400%;animation:15s infinite meshGradient}.glow-on-hover{position:relative}.glow-on-hover:after{content:"";border-radius:inherit;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));opacity:0;z-index:-1;filter:blur(12px);transition:opacity var(--transition-normal);position:absolute;inset:-2px}.glow-on-hover:hover:after{opacity:.25}.card-raised{box-shadow:var(--shadow-md);border:1px solid var(--border-color)}.card-raised:hover{box-shadow:var(--shadow-lg);border-color:var(--color-primary)}.card-floating{box-shadow:var(--shadow-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#131c31d9;border:1px solid #ffffff0f}[data-theme=light] .card-floating{background:#ffffffd9;border:1px solid #0000000d}.btn:active{transition:transform 50ms!important;transform:translateY(1px)scale(.98)!important}.chemistry-loader{align-items:center;gap:6px;display:inline-flex}.chemistry-loader .atom{border-radius:50%;width:12px;height:12px;animation:1.4s ease-in-out infinite bubble}.chemistry-loader .atom:first-child{background:var(--color-primary);animation-delay:0s}.chemistry-loader .atom:nth-child(2){background:var(--color-secondary);animation-delay:.2s}.chemistry-loader .atom:nth-child(3){background:var(--color-accent);animation-delay:.4s}.text-display{letter-spacing:-.02em;font-weight:800;line-height:1.1}.text-heading{letter-spacing:-.01em;font-weight:700;line-height:1.2}.reading-progress{background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));z-index:10001;height:3px;transition:width .1s linear;position:fixed;top:0;left:0}.command-palette-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10000;background:#00000080;justify-content:center;padding-top:15vh;animation:.15s ease-out fadeIn;display:flex;position:fixed;inset:0}.command-palette{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-xl);width:100%;max-width:560px;box-shadow:var(--shadow-xl);flex-direction:column;max-height:60vh;animation:.15s ease-out scaleIn;display:flex;overflow:hidden}.command-palette-input{color:var(--text-primary);border:none;border-bottom:1px solid var(--border-color);background:0 0;outline:none;width:100%;padding:16px 20px;font-size:1rem}.command-palette-results{flex:1;padding:8px;overflow-y:auto}.command-palette-item{border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast);color:var(--text-primary);align-items:center;gap:12px;padding:10px 12px;text-decoration:none;display:flex}.command-palette-item:hover,.command-palette-item.active{background:var(--bg-surface-hover)}.toast--achievement{animation:.4s ease-out slideInRight,2s ease-in-out .4s glowPulse;border-left-color:gold!important}.toast--levelup{animation:.4s ease-out slideInRight,2s ease-in-out .4s glowPulse;border-left-color:#8b5cf6!important}.toast--streak{border-left-color:#f59e0b!important}.toast--xp{border-left-color:var(--color-primary)!important;padding:8px 16px!important;font-size:.85rem!important}.stagger-in>*{animation:.4s ease-out both fadeInUp}.stagger-in>:first-child{animation-delay:0s}.stagger-in>:nth-child(2){animation-delay:50ms}.stagger-in>:nth-child(3){animation-delay:.1s}.stagger-in>:nth-child(4){animation-delay:.15s}.stagger-in>:nth-child(5){animation-delay:.2s}.stagger-in>:nth-child(6){animation-delay:.25s}.stagger-in>:nth-child(7){animation-delay:.3s}.stagger-in>:nth-child(8){animation-delay:.35s}.admin-layout{min-height:calc(100vh - 64px);display:flex}.admin-sidebar{background:var(--bg-surface);border-right:1px solid var(--border-color);flex-shrink:0;width:240px;height:calc(100vh - 64px);padding:1rem 0;position:sticky;top:64px;overflow-y:auto}.admin-sidebar-link{color:var(--text-secondary);transition:all var(--transition-fast);border-left:3px solid #0000;align-items:center;gap:10px;padding:10px 20px;font-size:.85rem;text-decoration:none;display:flex}.admin-sidebar-link:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.admin-sidebar-link.active{color:var(--color-primary);background:var(--color-primary-light);border-left-color:var(--color-primary);font-weight:600}.admin-content{flex:1;min-width:0}@media (max-width:768px){.admin-sidebar{display:none}}
