*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4f46e5;--primary-dark: #4338ca;--secondary: #10b981;--background: #f9fafb;--surface: #ffffff;--text: #1f2937;--text-light: #6b7280;--border: #e5e7eb;--error: #ef4444;--success: #22c55e}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--background);color:var(--text);line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.card{background:var(--surface);border-radius:.75rem;box-shadow:0 1px 3px #0000001a;padding:1.5rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:.5rem;font-weight:500;font-size:1rem;transition:all .15s ease;border:none}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-dark)}.btn-secondary{background-color:var(--secondary);color:#fff}.btn-outline{background-color:transparent;border:2px solid var(--primary);color:var(--primary)}.btn-outline:hover{background-color:var(--primary);color:#fff}.input{width:100%;padding:.75rem 1rem;border:1px solid var(--border);border-radius:.5rem;font-size:1rem;transition:border-color .15s ease}.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.error-message{color:var(--error);font-size:.875rem;margin-top:.5rem}.success-message{color:var(--success);font-size:.875rem;margin-top:.5rem}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.spinner-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;padding:2rem}.spinner{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.spinner-text{color:var(--text-light);font-size:.875rem}@keyframes slideUp{0%{opacity:0;transform:translate(-50%) translateY(1rem)}to{opacity:1;transform:translate(-50%) translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}.typing-indicator{display:flex;gap:4px;padding:4px 0}.typing-indicator span{width:8px;height:8px;background:var(--text-light);border-radius:50%;animation:typing 1.4s infinite ease-in-out both}.typing-indicator span:nth-child(1){animation-delay:0s}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,80%,to{transform:scale(.6);opacity:.5}40%{transform:scale(1);opacity:1}}.error-boundary{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;background:var(--background)}.error-boundary-content{text-align:center;max-width:400px}.error-boundary-icon{width:64px;height:64px;border-radius:50%;background:var(--error);color:#fff;font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem}.error-boundary-content h1{font-size:1.5rem;font-weight:600;margin-bottom:.5rem}.error-boundary-content p{color:var(--text-light);margin-bottom:1.5rem}.error-boundary-details{text-align:left;margin-bottom:1.5rem;background:var(--surface);border-radius:.5rem;padding:1rem}.error-boundary-details summary{cursor:pointer;font-weight:500;margin-bottom:.5rem}.error-boundary-details pre{font-size:.75rem;color:var(--error);white-space:pre-wrap;word-break:break-word}.error-boundary-actions{display:flex;gap:.75rem;justify-content:center}.lessons-toggle{display:none;align-items:center;gap:.3rem;padding:.3rem .625rem;border:1px solid var(--border);border-radius:.375rem;background:transparent;color:var(--text);font-size:.8125rem;cursor:pointer;white-space:nowrap;flex-shrink:0}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:50}.error-alert{background:#ef44440d;border:1px solid var(--error);border-radius:.75rem;padding:1.5rem;text-align:center;margin:1rem}.error-alert-icon{width:48px;height:48px;border-radius:50%;background:var(--error);color:#fff;font-size:1.5rem;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem}.error-alert h3{font-size:1.125rem;font-weight:600;margin-bottom:.5rem}.error-alert p{color:var(--text-light);margin-bottom:1rem;font-size:.875rem}.error-alert-actions{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}.mobile-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.75rem}.mobile-header-actions{display:flex;align-items:center;gap:.5rem}.mobile-user-info{display:none}.hide-mobile{display:inline}@media (max-width: 768px){.hide-mobile{display:none!important}.container{padding:0 .75rem}.card{padding:1rem}.lessons-toggle{display:flex}.sidebar-overlay.open{display:block}.learn-sidebar{position:fixed;left:0;top:0;bottom:0;width:280px;z-index:60;transform:translate(-100%);transition:transform .3s ease}.learn-sidebar.open{transform:translate(0)}.mobile-header{flex-direction:column;align-items:flex-start}.mobile-header-actions{width:100%;justify-content:space-between}.mobile-user-info{display:block;font-size:.875rem;color:var(--text-light);width:100%;padding-top:.5rem;border-top:1px solid var(--border);margin-top:.5rem}.desktop-user-info{display:none}.hero-title{font-size:2rem!important}.hero-subtitle{font-size:1rem!important}.activity-item{flex-direction:column;align-items:flex-start!important;gap:.5rem}.activity-item-actions{width:100%;justify-content:space-between}.parent-header-actions{flex-wrap:wrap}.parent-header-actions .btn{flex:1;min-width:100px}.invite-code-display{flex-direction:column}.invite-code-display .btn{width:100%}}