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0);mask-composite:exclude}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.animate-fade-in{animation:fadeIn var(--transition-base) ease-out}.animate-slide-in{animation:slideIn var(--transition-base) ease-out}.animate-pulse{animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}.animate-spin{animation:spin 1s linear infinite}.animate-float{animation:float 3s ease-in-out infinite}.container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--space-4)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:var(--space-2)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.gap-8{gap:var(--space-8)}.text-center{text-align:center}.font-bold{font-weight:700}.font-semibold{font-weight:600}.rounded{border-radius:var(--radius-md)}.rounded-lg{border-radius:var(--radius-lg)}.rounded-xl{border-radius:var(--radius-xl)}.rounded-full{border-radius:var(--radius-full)}.shadow{box-shadow:var(--shadow-md)}.shadow-lg{box-shadow:var(--shadow-lg)}.shadow-xl{box-shadow:var(--shadow-xl)}.radio-group{display:flex;gap:1.5rem;align-items:center;margin-bottom:.5rem}.radio-group label{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-weight:500;color:var(--text-primary);-webkit-user-select:none;user-select:none}.radio-group input[type=radio]{width:1.1rem;height:1.1rem;accent-color:var(--primary-color);cursor:pointer;margin:0}.form-actions{display:flex;gap:1rem;margin-top:2rem;justify-content:flex-end}.form-actions button{min-width:120px;padding:.75rem 1.5rem;font-weight:600}.form-actions.full-width button{flex:1}@media (max-width: 768px){html{font-size:14px}.container{padding:0 var(--space-3)}}@media (max-width: 480px){html{font-size:13px}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-family:var(--font-primary);font-size:var(--text-base);font-weight:600;line-height:1;text-align:center;text-decoration:none;white-space:nowrap;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);outline:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-lg),var(--shadow-glow)}.btn-secondary{background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover:not(:disabled){background:var(--bg-tertiary);transform:translateY(-2px)}.btn-ghost{background:transparent;color:var(--primary-500)}.btn-ghost:hover:not(:disabled){background:var(--glass-bg)}.btn-sm{padding:var(--space-2) var(--space-4);font-size:var(--text-sm)}.btn-lg{padding:var(--space-4) var(--space-8);font-size:var(--text-lg)}.card{background:var(--bg-secondary);border-radius:var(--radius-xl);padding:var(--space-6);border:1px solid var(--border-color);transition:all var(--transition-base)}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl)}.card-header{margin-bottom:var(--space-4);padding-bottom:var(--space-4);border-bottom:1px solid var(--border-color)}.card-title{font-size:var(--text-xl);font-weight:700;margin:0}.card-body{color:var(--text-secondary)}.card-footer{margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--border-color)}.input-group{margin-bottom:var(--space-4)}.input-label{display:block;margin-bottom:var(--space-2);font-size:var(--text-sm);font-weight:600;color:var(--text-primary)}.input{width:100%;padding:var(--space-3) var(--space-4);font-family:var(--font-primary);font-size:var(--text-base);color:var(--text-primary);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);outline:none;transition:all var(--transition-fast)}.input:focus{border-color:var(--primary-500);box-shadow:0 0 0 3px #6366f11a}.input::placeholder{color:var(--text-tertiary)}.input-error{border-color:var(--error)}.input-error:focus{box-shadow:0 0 0 3px #ef44441a}.error-message{margin-top:var(--space-2);font-size:var(--text-sm);color:var(--error)}.badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.5px}.badge-primary{background:#6366f11a;color:var(--primary-500)}.badge-success{background:#10b9811a;color:var(--success)}.badge-warning{background:#f59e0b1a;color:var(--warning)}.badge-error{background:#ef44441a;color:var(--error)}.badge-easy{background:#10b9811a;color:var(--success)}.badge-medium{background:#f59e0b1a;color:var(--warning)}.badge-hard{background:#ef44441a;color:var(--error)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:var(--z-modal-backdrop);display:flex;align-items:center;justify-content:center;padding:var(--space-4);animation:fadeIn var(--transition-base)}.modal{background:var(--bg-primary);border-radius:var(--radius-2xl);box-shadow:var(--shadow-2xl);max-width:500px;width:100%;max-height:90vh;overflow-y:auto;z-index:var(--z-modal);animation:fadeIn var(--transition-base)}.modal-header{padding:var(--space-6);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:var(--text-2xl);font-weight:700;margin:0}.modal-close{background:transparent;border:none;font-size:var(--text-2xl);cursor:pointer;color:var(--text-tertiary);transition:color var(--transition-fast)}.modal-close:hover{color:var(--text-primary)}.modal-body{padding:var(--space-6)}.modal-footer{padding:var(--space-6);border-top:1px solid var(--border-color);display:flex;gap:var(--space-3);justify-content:flex-end}.spinner{width:40px;height:40px;border:4px solid var(--border-color);border-top-color:var(--primary-500);border-radius:var(--radius-full);animation:spin 1s linear infinite}.spinner-sm{width:20px;height:20px;border-width:2px}.spinner-lg{width:60px;height:60px;border-width:6px}.alert{padding:var(--space-4);border-radius:var(--radius-lg);margin-bottom:var(--space-4);display:flex;align-items:flex-start;gap:var(--space-3)}.alert-success{background:#10b9811a;border:1px solid var(--success);color:var(--success)}.alert-warning{background:#f59e0b1a;border:1px solid var(--warning);color:var(--warning)}.alert-error{background:#ef44441a;border:1px solid var(--error);color:var(--error)}.alert-info{background:#3b82f61a;border:1px solid var(--info);color:var(--info)}.progress{width:100%;height:8px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.progress-bar{height:100%;background:var(--gradient-primary);border-radius:var(--radius-full);transition:width var(--transition-base)}.tooltip{position:relative;display:inline-block}.tooltip-text{visibility:hidden;position:absolute;bottom:125%;left:50%;transform:translate(-50%);padding:var(--space-2) var(--space-3);background:var(--gray-900);color:#fff;font-size:var(--text-sm);border-radius:var(--radius-md);white-space:nowrap;z-index:var(--z-tooltip);opacity:0;transition:opacity var(--transition-fast)}.tooltip:hover .tooltip-text{visibility:visible;opacity:1}.tabs{display:flex;gap:var(--space-2);border-bottom:2px solid var(--border-color);margin-bottom:var(--space-6)}.tab{padding:var(--space-3) var(--space-4);background:transparent;border:none;border-bottom:2px solid transparent;color:var(--text-tertiary);font-size:var(--text-base);font-weight:600;cursor:pointer;transition:all var(--transition-fast);margin-bottom:-2px}.tab:hover{color:var(--text-primary)}.tab-active{color:var(--primary-500);border-bottom-color:var(--primary-500)}.dropdown{position:relative;display:inline-block}.dropdown-menu{position:absolute;top:100%;right:0;margin-top:var(--space-2);background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);min-width:200px;z-index:var(--z-dropdown);opacity:0;visibility:hidden;transform:translateY(-10px);transition:all var(--transition-fast)}.dropdown.active .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-item{display:block;width:100%;padding:var(--space-3) var(--space-4);text-align:left;background:transparent;border:none;color:var(--text-primary);cursor:pointer;transition:background var(--transition-fast)}.dropdown-item:hover{background:var(--bg-secondary)}.dropdown-divider{height:1px;background:var(--border-color);margin:var(--space-2) 0}