.header{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);background:var(--header-bg);border-bottom:1px solid var(--nav-border);position:fixed;top:0;transition:all .3s cubic-bezier(.4,0,.2,1);width:100%;z-index:1000}.nav-container{justify-content:space-between;position:relative}.logo,.nav-container{align-items:center;display:flex}.logo{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:900;gap:.5rem;z-index:1001}.logo:before{content:"📚";filter:drop-shadow(0 2px 4px rgba(102,126,234,.3));font-size:1.5rem}.nav-links{align-items:center;display:flex;gap:2.5rem;list-style:none}.nav-links a{color:var(--text-color);font-size:.95rem;font-weight:500;padding:.5rem 0;position:relative;text-decoration:none}.nav-links a,.nav-links a:after{transition:all .3s cubic-bezier(.4,0,.2,1)}.nav-links a:after{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:2px;bottom:-2px;content:"";height:2px;left:50%;position:absolute;transform:translateX(-50%);width:0}.nav-links a:hover{color:#667eea;transform:translateY(-1px)}.nav-links a:hover:after{width:100%}.auth-buttons{gap:1rem}.auth-buttons,.theme-toggle{align-items:center;display:flex}.theme-toggle{background:#667eea1a;border:2px solid #667eea33;border-radius:12px;color:var(--text-color);cursor:pointer;font-size:1.2rem;height:48px;justify-content:center;margin-right:1rem;overflow:hidden;position:relative;transition:all .3s cubic-bezier(.4,0,.2,1);width:48px}.theme-toggle:before{background:linear-gradient(90deg,#0000,#667eea33,#0000);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .5s ease;width:100%}.theme-toggle:hover{background:#667eea33;border-color:#667eea;box-shadow:0 4px 20px #667eea4d;transform:scale(1.05)}.theme-toggle:hover:before{left:100%}.theme-toggle:active{transform:scale(.95)}.mobile-menu-btn{background:none;border:none;border-radius:8px;cursor:pointer;display:none;height:40px;padding:.5rem;position:relative;transition:all .3s ease;width:40px;z-index:1001}.mobile-menu-btn:hover{background:#667eea1a}.hamburger{height:18px;position:relative;transition:.3s ease-in-out;width:24px}.hamburger span{background:var(--text-color);border-radius:2px;display:block;height:2px;left:0;position:absolute;transition:.25s ease-in-out;width:100%}.hamburger span:first-child{top:0}.hamburger span:nth-child(2){top:8px}.hamburger span:nth-child(3){top:16px}.mobile-menu-btn.active .hamburger span:first-child{top:8px;transform:rotate(135deg)}.mobile-menu-btn.active .hamburger span:nth-child(2){left:-24px;opacity:0}.mobile-menu-btn.active .hamburger span:nth-child(3){top:8px;transform:rotate(-135deg)}.mobile-menu{align-items:center;background:var(--bg-color);display:flex;flex-direction:column;gap:3rem;height:100vh;justify-content:center;left:0;opacity:0;padding:2rem;position:fixed;top:0;transform:translateY(-100%);transition:all .4s cubic-bezier(.4,0,.2,1);visibility:hidden;width:100%;z-index:1000}.mobile-menu.active{opacity:1;transform:translateY(0);visibility:visible}.mobile-close-btn{align-items:center;background:#667eea1a;border:2px solid #667eea33;border-radius:50%;color:var(--text-color);cursor:pointer;display:flex;font-size:1.5rem;height:50px;justify-content:center;position:absolute;right:2rem;top:2rem;transition:all .3s cubic-bezier(.4,0,.2,1);width:50px;z-index:1001}.mobile-close-btn:hover{background:#667eea33;border-color:#667eea;box-shadow:0 4px 20px #667eea4d;transform:rotate(90deg) scale(1.1)}.mobile-menu nav{align-items:center;display:flex;justify-content:center;width:100%}.mobile-menu .nav-links{display:flex;flex-direction:column;gap:1.5rem;list-style:none;margin:0;max-width:350px;padding:0;text-align:center;width:100%}.mobile-menu .nav-links a{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#667eea14;border:2px solid #667eea26;border-radius:16px;color:var(--text-color);display:block;font-size:1.8rem;font-weight:700;padding:1.2rem 2rem;position:relative;text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1);width:100%}.mobile-menu .nav-links a:hover{background:linear-gradient(135deg,#667eea,#764ba2);border-color:#ffffff4d;box-shadow:0 12px 35px #667eea66;color:#fff;transform:translateY(-3px) scale(1.02)}.mobile-menu .auth-buttons{align-items:center;display:flex;flex-direction:column;gap:1rem;max-width:300px;width:100%}.mobile-menu .auth-buttons .btn{min-width:200px;padding:1.2rem 2rem;width:100%}@media (max-width:1024px){.nav-container{padding:1rem 1.5rem}}@media (max-width:768px){.nav-container{padding:1rem}.nav-links{display:none}.mobile-menu-btn{display:flex}.logo{font-size:1.6rem}.theme-toggle{height:44px;margin-right:.5rem;width:44px}.auth-buttons .btn{font-size:.9rem;padding:.6rem 1.2rem}}.nav-links a.active{color:#667eea}.nav-links a.active:after{width:100%}.mobile-menu .nav-links a.active{background:linear-gradient(135deg,#667eea,#764ba2);border-color:#ffffff4d;color:#fff}body,html{overflow-x:hidden;width:100%}.header{left:0;right:0}.header,.header *{box-sizing:border-box}.nav-container{margin:0 auto;max-width:1400px;overflow-x:hidden;padding:1rem 2rem}.mobile-menu{inset:0;overflow-x:hidden}@media (max-width:768px){.mobile-menu .nav-links a{transform-origin:center center}.auth-buttons{display:none!important}}.mobile-controls{align-items:stretch;display:flex;flex-direction:column;gap:1rem;max-width:300px;width:100%}.theme-toggle--mobile{border-radius:12px;gap:.6rem;height:auto;justify-content:center;padding:.9rem 1rem;width:100%}.theme-toggle--mobile .theme-label{color:var(--text-color);font-size:1rem;font-weight:600}.mobile-auth{display:flex;justify-content:center;width:100%}.mobile-auth .btn,.mobile-auth a,.mobile-auth button{max-width:300px;width:100%}.card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:20px;box-shadow:0 20px 60px var(--shadow);padding:24px}.card-header{text-align:center}.card-header h2{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;font-size:1.8rem;font-weight:800;margin-bottom:.25rem}.card-header p{color:var(--text-secondary);margin-top:.25rem}.label{display:block;font-size:.9rem;margin:.9rem 0 .4rem}.input,.label{color:var(--text-color)}.input{background:var(--card-bg);border:2px solid #667eea33;border-radius:12px;outline:none;padding:.75rem 1rem;width:100%}.input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.input.error{border-color:#e74c3c}.msg.error{color:#e74c3c;font-size:.8rem;margin-top:.3rem}.row.between{align-items:center;display:flex;justify-content:center;margin:.6rem 0 1rem}.btn{border:2px solid #0000;gap:.5rem;padding:.75rem 1.25rem}.btn-primary:disabled{cursor:not-allowed;opacity:.7}form .btn.btn-primary{display:flex;margin-inline:auto}.btn-google{align-items:center;background:#fff;border:2px solid #667eea33;border-radius:12px;color:#3c4043;display:flex;gap:.75rem;justify-content:center;margin-top:1rem;padding:.85rem 1rem;transition:all .3s ease;width:100%}.btn-google:hover{background:#f8f9fa;border-color:#667eea59;box-shadow:0 4px 12px #0000001a;color:#3c4043}.btn-google:focus-visible{box-shadow:0 0 0 3px #667eea26;outline:none}[data-theme=dark] .btn-google{background:#1a1a2e;border-color:#667eea33;color:var(--text-color)}[data-theme=dark] .btn-google:hover{background:#2a2a3e;border-color:#667eea59;box-shadow:0 4px 12px #00000059;color:var(--text-color)}.divider{color:var(--text-secondary);margin:1rem 0;position:relative;text-align:center}.divider:before{background:#667eea33;content:"";height:1px;left:0;position:absolute;right:0;top:50%}.divider span{background:var(--card-bg);padding:0 .6rem;position:relative}.text-link{background:none;border:none;color:#667eea;cursor:pointer;font-weight:500}.text-link:hover{text-decoration:underline}.foot{color:var(--text-secondary);font-size:.9rem;margin-top:1rem;text-align:center}.foot .text-link{font-size:inherit;line-height:inherit}.spinner{animation:spin 1s linear infinite;border:2px solid #0000;border-radius:50%;border-top-color:currentcolor;height:18px;width:18px}@keyframes spin{to{transform:rotate(1turn)}}.otp-row{display:flex;gap:.5rem;justify-content:center;margin:1.2rem 0}.otp{background:var(--card-bg);border:2px solid #667eea33;border-radius:12px;color:var(--text-color);font-size:1.2rem;font-weight:700;height:50px;text-align:center;width:50px}.otp:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1a;transform:scale(1.05)}.otp.filled{background:#667eea14;border-color:#667eea}.btn-back{background:#0000;border:2px solid #6c757d4d;color:#6c757d}.btn-back:hover{background:#6c757d;color:#fff}.resend{margin-top:1rem;text-align:center}.note{color:var(--text-secondary);margin-bottom:.25rem}.link{background:none;border:none;color:#667eea;cursor:pointer;font-weight:600}.countdown{color:var(--text-secondary)}.center,.demo{text-align:center}.demo{color:var(--text-secondary);font-size:.85rem;margin-top:.6rem}.strength{margin-top:.5rem}.bar{background:#667eea1a;border-radius:2px;height:4px;margin-bottom:.4rem;overflow:hidden}.fill{height:100%;transition:.3s}.fill.weak{background:#e74c3c;width:25%}.fill.fair{background:#f39c12;width:50%}.fill.good{background:#27ae60;width:75%}.fill.strong{background:#2ecc71;width:100%}.s-text{font-size:.8rem;font-weight:600}.s-text.weak{color:#e74c3c}.s-text.fair{color:#f39c12}.s-text.good{color:#27ae60}.s-text.strong{color:#2ecc71}.msg.success{color:#27ae60;font-size:.85rem;margin-top:.3rem}:root{--border-color:#00000014}[data-theme=dark]{--border-color:#ffffff1f;--shadow:#00000059}.lm-overlay{align-items:center;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#000000a6;display:flex;inset:0;justify-content:center;overflow:auto;padding:calc(16px + env(safe-area-inset-top)) 16px 16px;position:fixed;z-index:9999}.lm-modal{background:#fff;background:var(--card-bg);border:1px solid #00000014;border:1px solid var(--border-color);border-radius:20px;box-shadow:0 20px 60px #0000004d;max-height:min(88vh,720px);max-width:480px;overflow:auto;padding:22px;width:100%}.lm-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:8px}.lm-logo{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;font-size:1.5rem;font-weight:900}.lm-actions{align-items:center;display:flex;gap:.5rem}.lm-close{background:#0000;border:none;border-radius:50%;color:#666;color:var(--text-secondary);cursor:pointer;font-size:1.4rem;height:36px;width:36px}.lm-close:hover{background:#6c757d26}.lm-theme-toggle{background:#667eea1a;border:2px solid #667eea33;border-radius:12px;cursor:pointer;height:40px;width:40px}@media (max-width:480px){.lm-modal{border-radius:14px}}.has-fixed-header .lm-overlay{padding-top:80px}.profile-icon{border-radius:50%;cursor:pointer;height:40px;object-fit:cover;transition:transform .2s ease,box-shadow .2s ease;width:40px}.profile-icon:hover{box-shadow:0 0 0 3px #667eea4d;transform:scale(1.05)}.modal-portal{align-items:center;display:flex;inset:0;justify-content:center;pointer-events:none;position:fixed;z-index:2147483647}.modal-portal *{pointer-events:auto}.modal-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f0f23a6;inset:0;position:absolute}body.modal-open{overflow:hidden}:root{--toastify-color-light:#fff;--toastify-color-dark:#121212;--toastify-color-info:#3498db;--toastify-color-success:#07bc0c;--toastify-color-warning:#f1c40f;--toastify-color-error:#e74d3c;--toastify-color-transparent:#ffffffb3;--toastify-icon-color-info:var(--toastify-color-info);--toastify-icon-color-success:var(--toastify-color-success);--toastify-icon-color-warning:var(--toastify-color-warning);--toastify-icon-color-error:var(--toastify-color-error);--toastify-container-width:fit-content;--toastify-toast-width:320px;--toastify-toast-offset:16px;--toastify-toast-top:max(var(--toastify-toast-offset),env(safe-area-inset-top));--toastify-toast-right:max(var(--toastify-toast-offset),env(safe-area-inset-right));--toastify-toast-left:max(var(--toastify-toast-offset),env(safe-area-inset-left));--toastify-toast-bottom:max(var(--toastify-toast-offset),env(safe-area-inset-bottom));--toastify-toast-background:#fff;--toastify-toast-padding:14px;--toastify-toast-min-height:64px;--toastify-toast-max-height:800px;--toastify-toast-bd-radius:6px;--toastify-toast-shadow:0px 4px 12px #0000001a;--toastify-font-family:sans-serif;--toastify-z-index:9999;--toastify-text-color-light:#757575;--toastify-text-color-dark:#fff;--toastify-text-color-info:#fff;--toastify-text-color-success:#fff;--toastify-text-color-warning:#fff;--toastify-text-color-error:#fff;--toastify-spinner-color:#616161;--toastify-spinner-color-empty-area:#e0e0e0;--toastify-color-progress-light:linear-gradient(90deg,#4cd964,#5ac8fa,#007aff,#34aadc,#5856d6,#ff2d55);--toastify-color-progress-dark:#bb86fc;--toastify-color-progress-info:var(--toastify-color-info);--toastify-color-progress-success:var(--toastify-color-success);--toastify-color-progress-warning:var(--toastify-color-warning);--toastify-color-progress-error:var(--toastify-color-error);--toastify-color-progress-bgo:0.2}.Toastify__toast-container{box-sizing:border-box;color:#fff;display:flex;flex-direction:column;position:fixed;-webkit-transform:translateZ(9999);-webkit-transform:translateZ(var(--toastify-z-index));width:-webkit-fit-content;width:fit-content;width:var(--toastify-container-width);z-index:9999;z-index:var(--toastify-z-index)}.Toastify__toast-container--top-left{left:max(16px,env(safe-area-inset-left));left:var(--toastify-toast-left);top:max(16px,env(safe-area-inset-top));top:var(--toastify-toast-top)}.Toastify__toast-container--top-center{align-items:center;left:50%;top:max(16px,env(safe-area-inset-top));top:var(--toastify-toast-top);transform:translateX(-50%)}.Toastify__toast-container--top-right{align-items:end;right:max(16px,env(safe-area-inset-right));right:var(--toastify-toast-right);top:max(16px,env(safe-area-inset-top));top:var(--toastify-toast-top)}.Toastify__toast-container--bottom-left{bottom:max(16px,env(safe-area-inset-bottom));bottom:var(--toastify-toast-bottom);left:max(16px,env(safe-area-inset-left));left:var(--toastify-toast-left)}.Toastify__toast-container--bottom-center{align-items:center;bottom:max(16px,env(safe-area-inset-bottom));bottom:var(--toastify-toast-bottom);left:50%;transform:translateX(-50%)}.Toastify__toast-container--bottom-right{align-items:end;bottom:max(16px,env(safe-area-inset-bottom));bottom:var(--toastify-toast-bottom);right:max(16px,env(safe-area-inset-right));right:var(--toastify-toast-right)}.Toastify__toast{--y:0;align-items:center;border-radius:6px;border-radius:var(--toastify-toast-bd-radius);box-shadow:0 4px 12px #0000001a;box-shadow:var(--toastify-toast-shadow);box-sizing:border-box;display:flex;flex:1 1 auto;font-family:sans-serif;font-family:var(--toastify-font-family);margin-bottom:1rem;max-height:800px;max-height:var(--toastify-toast-max-height);min-height:64px;min-height:var(--toastify-toast-min-height);padding:14px;padding:var(--toastify-toast-padding);position:relative;touch-action:none;width:320px;width:var(--toastify-toast-width);word-break:break-word;z-index:0}@media only screen and (max-width:480px){.Toastify__toast-container{left:env(safe-area-inset-left);margin:0;width:100vw}.Toastify__toast-container--top-center,.Toastify__toast-container--top-left,.Toastify__toast-container--top-right{top:env(safe-area-inset-top);transform:translateX(0)}.Toastify__toast-container--bottom-center,.Toastify__toast-container--bottom-left,.Toastify__toast-container--bottom-right{bottom:env(safe-area-inset-bottom);transform:translateX(0)}.Toastify__toast-container--rtl{left:auto;right:env(safe-area-inset-right)}.Toastify__toast{--toastify-toast-width:100%;border-radius:0;margin-bottom:0}}.Toastify__toast-container[data-stacked=true]{width:320px;width:var(--toastify-toast-width)}.Toastify__toast--stacked{position:absolute;transform:translate3d(0,var(--y),0) scale(var(--s));transition:transform .3s;width:100%}.Toastify__toast--stacked[data-collapsed] .Toastify__close-button,.Toastify__toast--stacked[data-collapsed] .Toastify__toast-body{transition:opacity .1s}.Toastify__toast--stacked[data-collapsed=false]{overflow:visible}.Toastify__toast--stacked[data-collapsed=true]:not(:last-child)>*{opacity:0}.Toastify__toast--stacked:after{bottom:100%;content:"";height:calc(var(--g)*1px);left:0;position:absolute;right:0}.Toastify__toast--stacked[data-pos=top]{top:0}.Toastify__toast--stacked[data-pos=bot]{bottom:0}.Toastify__toast--stacked[data-pos=bot].Toastify__toast--stacked:before{transform-origin:top}.Toastify__toast--stacked[data-pos=top].Toastify__toast--stacked:before{transform-origin:bottom}.Toastify__toast--stacked:before{bottom:0;content:"";height:100%;left:0;position:absolute;right:0;transform:scaleY(3);z-index:-1}.Toastify__toast--rtl{direction:rtl}.Toastify__toast--close-on-click{cursor:pointer}.Toastify__toast-icon{-webkit-margin-end:10px;display:flex;flex-shrink:0;margin-inline-end:10px;width:22px}.Toastify--animate{animation-duration:.5s;animation-fill-mode:both}.Toastify--animate-icon{animation-duration:.3s;animation-fill-mode:both}.Toastify__toast-theme--dark{background:#121212;background:var(--toastify-color-dark);color:#fff;color:var(--toastify-text-color-dark)}.Toastify__toast-theme--colored.Toastify__toast--default,.Toastify__toast-theme--light{background:#fff;background:var(--toastify-color-light);color:#757575;color:var(--toastify-text-color-light)}.Toastify__toast-theme--colored.Toastify__toast--info{background:#3498db;background:var(--toastify-color-info);color:#fff;color:var(--toastify-text-color-info)}.Toastify__toast-theme--colored.Toastify__toast--success{background:#07bc0c;background:var(--toastify-color-success);color:#fff;color:var(--toastify-text-color-success)}.Toastify__toast-theme--colored.Toastify__toast--warning{background:#f1c40f;background:var(--toastify-color-warning);color:#fff;color:var(--toastify-text-color-warning)}.Toastify__toast-theme--colored.Toastify__toast--error{background:#e74d3c;background:var(--toastify-color-error);color:#fff;color:var(--toastify-text-color-error)}.Toastify__progress-bar-theme--light{background:linear-gradient(90deg,#4cd964,#5ac8fa,#007aff,#34aadc,#5856d6,#ff2d55);background:var(--toastify-color-progress-light)}.Toastify__progress-bar-theme--dark{background:#bb86fc;background:var(--toastify-color-progress-dark)}.Toastify__progress-bar--info{background:#3498db;background:var(--toastify-color-progress-info)}.Toastify__progress-bar--success{background:#07bc0c;background:var(--toastify-color-progress-success)}.Toastify__progress-bar--warning{background:#f1c40f;background:var(--toastify-color-progress-warning)}.Toastify__progress-bar--error{background:#e74d3c;background:var(--toastify-color-progress-error)}.Toastify__progress-bar-theme--colored.Toastify__progress-bar--error,.Toastify__progress-bar-theme--colored.Toastify__progress-bar--info,.Toastify__progress-bar-theme--colored.Toastify__progress-bar--success,.Toastify__progress-bar-theme--colored.Toastify__progress-bar--warning{background:#ffffffb3;background:var(--toastify-color-transparent)}.Toastify__close-button{background:#0000;border:none;color:#fff;cursor:pointer;opacity:.7;outline:none;padding:0;position:absolute;right:6px;top:6px;transition:.3s ease;z-index:1}.Toastify__toast--rtl .Toastify__close-button{left:6px;right:auto}.Toastify__close-button--light{color:#000;opacity:.3}.Toastify__close-button>svg{fill:currentColor;height:16px;width:14px}.Toastify__close-button:focus,.Toastify__close-button:hover{opacity:1}@keyframes Toastify__trackProgress{0%{transform:scaleX(1)}to{transform:scaleX(0)}}.Toastify__progress-bar{bottom:0;height:100%;left:0;opacity:.7;position:absolute;transform-origin:left;width:100%;z-index:1}.Toastify__progress-bar--animated{animation:Toastify__trackProgress linear 1 forwards}.Toastify__progress-bar--controlled{transition:transform .2s}.Toastify__progress-bar--rtl{border-bottom-left-radius:0;left:auto;right:0;transform-origin:right}.Toastify__progress-bar--wrp{border-bottom-left-radius:6px;border-bottom-left-radius:var(--toastify-toast-bd-radius);border-bottom-right-radius:6px;border-bottom-right-radius:var(--toastify-toast-bd-radius);bottom:0;height:5px;left:0;overflow:hidden;position:absolute;width:100%}.Toastify__progress-bar--wrp[data-hidden=true]{opacity:0}.Toastify__progress-bar--bg{height:100%;opacity:.2;opacity:var(--toastify-color-progress-bgo);width:100%}.Toastify__spinner{animation:Toastify__spin .65s linear infinite;border:2px solid #e0e0e0;border-color:var(--toastify-spinner-color-empty-area);border-radius:100%;border-right-color:#616161;border-right-color:var(--toastify-spinner-color);box-sizing:border-box;height:20px;width:20px}@keyframes Toastify__bounceInRight{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(3000px,0,0)}60%{opacity:1;transform:translate3d(-25px,0,0)}75%{transform:translate3d(10px,0,0)}90%{transform:translate3d(-5px,0,0)}to{transform:none}}@keyframes Toastify__bounceOutRight{20%{opacity:1;transform:translate3d(-20px,var(--y),0)}to{opacity:0;transform:translate3d(2000px,var(--y),0)}}@keyframes Toastify__bounceInLeft{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(-3000px,0,0)}60%{opacity:1;transform:translate3d(25px,0,0)}75%{transform:translate3d(-10px,0,0)}90%{transform:translate3d(5px,0,0)}to{transform:none}}@keyframes Toastify__bounceOutLeft{20%{opacity:1;transform:translate3d(20px,var(--y),0)}to{opacity:0;transform:translate3d(-2000px,var(--y),0)}}@keyframes Toastify__bounceInUp{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(0,3000px,0)}60%{opacity:1;transform:translate3d(0,-20px,0)}75%{transform:translate3d(0,10px,0)}90%{transform:translate3d(0,-5px,0)}to{transform:translateZ(0)}}@keyframes Toastify__bounceOutUp{20%{transform:translate3d(0,calc(var(--y) - 10px),0)}40%,45%{opacity:1;transform:translate3d(0,calc(var(--y) + 20px),0)}to{opacity:0;transform:translate3d(0,-2000px,0)}}@keyframes Toastify__bounceInDown{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0;transform:translate3d(0,-3000px,0)}60%{opacity:1;transform:translate3d(0,25px,0)}75%{transform:translate3d(0,-10px,0)}90%{transform:translate3d(0,5px,0)}to{transform:none}}@keyframes Toastify__bounceOutDown{20%{transform:translate3d(0,calc(var(--y) - 10px),0)}40%,45%{opacity:1;transform:translate3d(0,calc(var(--y) + 20px),0)}to{opacity:0;transform:translate3d(0,2000px,0)}}.Toastify__bounce-enter--bottom-left,.Toastify__bounce-enter--top-left{animation-name:Toastify__bounceInLeft}.Toastify__bounce-enter--bottom-right,.Toastify__bounce-enter--top-right{animation-name:Toastify__bounceInRight}.Toastify__bounce-enter--top-center{animation-name:Toastify__bounceInDown}.Toastify__bounce-enter--bottom-center{animation-name:Toastify__bounceInUp}.Toastify__bounce-exit--bottom-left,.Toastify__bounce-exit--top-left{animation-name:Toastify__bounceOutLeft}.Toastify__bounce-exit--bottom-right,.Toastify__bounce-exit--top-right{animation-name:Toastify__bounceOutRight}.Toastify__bounce-exit--top-center{animation-name:Toastify__bounceOutUp}.Toastify__bounce-exit--bottom-center{animation-name:Toastify__bounceOutDown}@keyframes Toastify__zoomIn{0%{opacity:0;transform:scale3d(.3,.3,.3)}50%{opacity:1}}@keyframes Toastify__zoomOut{0%{opacity:1}50%{opacity:0;transform:translate3d(0,var(--y),0) scale3d(.3,.3,.3)}to{opacity:0}}.Toastify__zoom-enter{animation-name:Toastify__zoomIn}.Toastify__zoom-exit{animation-name:Toastify__zoomOut}@keyframes Toastify__flipIn{0%{animation-timing-function:ease-in;opacity:0;transform:perspective(400px) rotateX(90deg)}40%{animation-timing-function:ease-in;transform:perspective(400px) rotateX(-20deg)}60%{opacity:1;transform:perspective(400px) rotateX(10deg)}80%{transform:perspective(400px) rotateX(-5deg)}to{transform:perspective(400px)}}@keyframes Toastify__flipOut{0%{transform:translate3d(0,var(--y),0) perspective(400px)}30%{opacity:1;transform:translate3d(0,var(--y),0) perspective(400px) rotateX(-20deg)}to{opacity:0;transform:translate3d(0,var(--y),0) perspective(400px) rotateX(90deg)}}.Toastify__flip-enter{animation-name:Toastify__flipIn}.Toastify__flip-exit{animation-name:Toastify__flipOut}@keyframes Toastify__slideInRight{0%{transform:translate3d(110%,0,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideInLeft{0%{transform:translate3d(-110%,0,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideInUp{0%{transform:translate3d(0,110%,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideInDown{0%{transform:translate3d(0,-110%,0);visibility:visible}to{transform:translate3d(0,var(--y),0)}}@keyframes Toastify__slideOutRight{0%{transform:translate3d(0,var(--y),0)}to{transform:translate3d(110%,var(--y),0);visibility:hidden}}@keyframes Toastify__slideOutLeft{0%{transform:translate3d(0,var(--y),0)}to{transform:translate3d(-110%,var(--y),0);visibility:hidden}}@keyframes Toastify__slideOutDown{0%{transform:translate3d(0,var(--y),0)}to{transform:translate3d(0,500px,0);visibility:hidden}}@keyframes Toastify__slideOutUp{0%{transform:translate3d(0,var(--y),0)}to{transform:translate3d(0,-500px,0);visibility:hidden}}.Toastify__slide-enter--bottom-left,.Toastify__slide-enter--top-left{animation-name:Toastify__slideInLeft}.Toastify__slide-enter--bottom-right,.Toastify__slide-enter--top-right{animation-name:Toastify__slideInRight}.Toastify__slide-enter--top-center{animation-name:Toastify__slideInDown}.Toastify__slide-enter--bottom-center{animation-name:Toastify__slideInUp}.Toastify__slide-exit--bottom-left,.Toastify__slide-exit--top-left{animation-duration:.3s;animation-name:Toastify__slideOutLeft;animation-timing-function:ease-in}.Toastify__slide-exit--bottom-right,.Toastify__slide-exit--top-right{animation-duration:.3s;animation-name:Toastify__slideOutRight;animation-timing-function:ease-in}.Toastify__slide-exit--top-center{animation-duration:.3s;animation-name:Toastify__slideOutUp;animation-timing-function:ease-in}.Toastify__slide-exit--bottom-center{animation-duration:.3s;animation-name:Toastify__slideOutDown;animation-timing-function:ease-in}@keyframes Toastify__spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}*{box-sizing:border-box;margin:0;padding:0}#root,body,html{height:100%}body{background-color:#fff;background-color:var(--bg-color);color:#333;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6;overflow-x:hidden;transition:background-color .3s ease,color .3s ease}:root{--bg-color:#fff;--text-color:#333;--text-secondary:#666;--card-bg:#fff;--border-color:#fff3;--shadow:#0000001a;--header-bg:#fffffff2;--input-bg:#ffffff1a;--post-border:#667eea;--nav-border:#667eea1a;--header-height:72px}[data-theme=dark]{--bg-color:#0f0f23;--text-color:#e4e4e7;--text-secondary:#a1a1aa;--card-bg:#1a1a2e;--border-color:#ffffff1a;--shadow:#0000004d;--header-bg:#0f0f23f2;--input-bg:#ffffff0d;--post-border:#8b5cf6;--nav-border:#8b5cf633}.section{margin:0 auto;max-width:1200px;padding:5rem 2rem}.section h2{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;background-clip:text;font-size:2.5rem;font-weight:700;margin-bottom:3rem;text-align:center}.btn{align-items:center;border:none;border-radius:50px;cursor:pointer;display:inline-flex;font-size:.95rem;font-weight:600;justify-content:center;overflow:hidden;padding:.75rem 1.75rem;position:relative;text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1);white-space:nowrap}.btn-small{font-size:.85rem;padding:.4rem .8rem}.btn-large{font-size:1.2rem;padding:.8rem 1.6rem}.btn:before{background:linear-gradient(90deg,#0000,#fff3,#0000);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .5s ease;width:100%}.btn:hover:before{left:100%}.btn-outline{background:#0000;border:2px solid #667eea;color:#667eea}.btn-outline:hover{background:#667eea;box-shadow:0 8px 25px #667eea4d;color:#fff;transform:translateY(-2px)}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);border:2px solid #0000;color:#fff}.btn-primary:hover{box-shadow:0 8px 25px #667eea66;transform:translateY(-2px)}.btn-primary-small{font-size:.85rem;padding:.4rem .8rem}.btn-primary-large{font-size:1.2rem;padding:.8rem 1.6rem}.difficulty{border-radius:20px;font-size:.8rem;font-weight:600;padding:.3rem 1rem;text-transform:capitalize}.difficulty.easy{background:#d4eddacc;color:#155724}.difficulty.medium{background:#fff3cdcc;color:#856404}.difficulty.hard{background:#f8d7dacc;color:#721c24}[data-theme=dark] .difficulty.easy{background:#228b2233;color:#90ee90}[data-theme=dark] .difficulty.medium{background:#ffa50033;color:orange}[data-theme=dark] .difficulty.hard{background:#dc143c33;color:#ff6b6b}.difficulty-badge{border-radius:20px;font-weight:600;padding:.3rem .8rem;text-transform:capitalize}.difficulty-beginner{background:#228b2233;color:#228b22}.difficulty-intermediate{background:#ffa50033;color:orange}.difficulty-advanced{background:#dc143c33;color:#dc143c}.student-count{color:#666;color:var(--text-secondary)}.skeleton{overflow:hidden;position:relative}.skeleton-shimmer{animation:shimmer 2s infinite;background:linear-gradient(90deg,#fff 25%,#667eea1a 50%,#fff 75%);background:linear-gradient(90deg,var(--card-bg) 25%,#667eea1a 50%,var(--card-bg) 75%);background-size:200% 100%}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton-line{border-radius:8px;height:16px;margin-bottom:12px}.skeleton-line.short{width:60%}.skeleton-button{border-radius:20px;height:40px;width:120px}.skeleton-badge{border-radius:12px;height:24px;width:60px}.skeleton-stats{border-radius:8px;height:16px;width:80px}.btn:focus{outline:2px solid #667eea;outline-offset:2px}@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media (max-width:1024px){.section{padding:4rem 1.5rem}}@media (max-width:768px){.section{padding:3rem 1rem}}
/*# sourceMappingURL=main.7776634d.css.map*/