.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);font-weight:var(--font-weight-medium);border-radius:4px;transition:background-color .2s ease,color .2s ease,opacity .2s ease;cursor:pointer;will-change:auto;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;box-sizing:border-box;background-color:#2563eb0d;color:var(--text-primary);border:none;padding:var(--spacing-sm) var(--spacing-md);outline:none;position:relative;min-height:44px;min-width:44px;text-decoration:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.btn:hover:not(:disabled){background-color:#2563eb26}.btn:active:not(:disabled),.btn.btn-active:not(:disabled){background-color:#2563eb;color:#fff;padding:var(--spacing-sm) var(--spacing-md);border:none;outline:none;box-sizing:border-box}.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 2px #2563eb4d;box-sizing:border-box}.btn:active:focus-visible{outline:none;box-shadow:inset 0 0 0 2px #2563eb4d;box-sizing:border-box}.btn:disabled{opacity:.6;cursor:not-allowed;background-color:#2563eb08}.btn-sm{padding:.375rem .75rem;font-size:var(--font-size-sm);gap:.375rem}.btn-sm:active:not(:disabled),.btn-sm.btn-active:not(:disabled){padding:.375rem .75rem;border:none;outline:none;box-sizing:border-box;width:auto;min-width:44px;max-width:100%}.btn-md{padding:.5rem 1rem;font-size:var(--font-size-base)}.btn-md:active:not(:disabled),.btn-md.btn-active:not(:disabled){padding:.5rem 1rem;border:none;outline:none;box-sizing:border-box}.btn-lg{padding:.75rem 1.5rem;font-size:var(--font-size-lg)}.btn-lg:active:not(:disabled),.btn-lg.btn-active:not(:disabled){padding:.75rem 1.5rem;border:none;outline:none;box-sizing:border-box}.btn.btn-primary{background:#2563eb!important;background-color:#2563eb!important;color:#fff!important;box-shadow:0 2px 4px #2563eb26}.btn.btn-primary:hover:not(:disabled){background:#1d4ed8!important;background-color:#1d4ed8!important;box-shadow:0 4px 8px #2563eb33}.btn.btn-primary:active:not(:disabled){background:#2563eb!important;background-color:#2563eb!important;color:#fff!important;box-shadow:0 2px 4px #2563eb26}.btn.btn-primary.btn-active{background:#2563eb!important;background-color:#2563eb!important;color:#fff!important}.btn.btn-primary.btn-active:hover:not(:disabled){background:#2563eb!important;background-color:#2563eb!important;color:#fff!important}.btn-secondary{background:#2563eb0d;color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:#2563eb26}.btn-secondary:active:not(:disabled){background:#2563eb;color:#fff}.btn-success{background:#2563eb0d;color:var(--text-primary)}.btn-success:hover:not(:disabled){background:#2563eb26}.btn-success:active:not(:disabled){background:#2563eb;color:#fff}.btn-error{background:#2563eb0d;color:var(--text-primary)}.btn-error:hover:not(:disabled){background:#2563eb26}.btn-error:active:not(:disabled){background:#2563eb;color:#fff}.btn-warning{background:#2563eb0d;color:var(--text-primary)}.btn-warning:hover:not(:disabled){background:#2563eb26}.btn-warning:active:not(:disabled){background:#2563eb;color:#fff}.btn-outline{background:#2563eb0d;color:var(--text-primary)}.btn-outline:hover:not(:disabled){background:#2563eb26}.btn-outline:active:not(:disabled){background:#2563eb;color:#fff}.btn-ghost{background:#2563eb0d;color:var(--text-primary)}.btn-ghost:hover:not(:disabled){background:#2563eb26}.btn-ghost:active:not(:disabled){background:#2563eb;color:#fff}.btn-danger{background:#2563eb0d;color:var(--text-primary)}.btn-danger:hover:not(:disabled){background:#2563eb26}.btn-danger:active:not(:disabled){background:#2563eb;color:#fff}.btn-full-width{width:100%}.btn-loading{cursor:wait;position:relative}.btn-spinner{width:1em;height:1em;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .6s linear infinite}.btn-content-loading{opacity:0}.btn-icon{padding:0;width:44px;height:44px;border-radius:50%}.btn-icon-sm{width:2rem;height:2rem;min-width:2rem;min-height:2rem}.btn-icon-lg{width:3.5rem;height:3.5rem;min-width:3.5rem;min-height:3.5rem}.btn-group{display:inline-flex;gap:0}.btn-group .btn{border-radius:0}.btn-group .btn:first-child{border-top-left-radius:var(--border-radius-md);border-bottom-left-radius:var(--border-radius-md)}.btn-group .btn:last-child{border-top-right-radius:var(--border-radius-md);border-bottom-right-radius:var(--border-radius-md)}.btn-group .btn:not(:last-child){border-right:1px solid rgba(255,255,255,.2)}@media (max-width: 768px){.btn{font-size:var(--font-size-sm);white-space:normal;word-break:break-word}.btn-lg{padding:.625rem 1.25rem;font-size:var(--font-size-base)}}@media (max-width: 480px){.btn{font-size:var(--font-size-xs);padding:.5rem .75rem;white-space:normal;word-break:break-word;-webkit-hyphens:auto;hyphens:auto;overflow:hidden;text-overflow:ellipsis}.btn:active:not(:disabled),.btn.btn-active:not(:disabled){padding:.5rem .75rem}.btn-sm{padding:.375rem .5rem}.btn-sm:active:not(:disabled),.btn-sm.btn-active:not(:disabled){padding:.375rem .5rem}.btn-md{padding:.5rem .75rem}.btn-md:active:not(:disabled),.btn-md.btn-active:not(:disabled){padding:.5rem .75rem}.btn-lg{padding:.625rem 1rem}.btn-lg:active:not(:disabled),.btn-lg.btn-active:not(:disabled){padding:.625rem 1rem}}@media (max-width: 375px){.btn{padding:.5rem .625rem;font-size:.75rem}.btn:active:not(:disabled),.btn.btn-active:not(:disabled){padding:.5rem .625rem}.btn-sm{padding:.375rem .5rem}.btn-sm:active:not(:disabled),.btn-sm.btn-active:not(:disabled){padding:.375rem .5rem}}@media (max-width: 320px){.btn{padding:.5rem;font-size:.7rem}.btn:active:not(:disabled),.btn.btn-active:not(:disabled){padding:.5rem}.btn-sm{padding:.3rem .4rem;font-size:.65rem}.btn-sm:active:not(:disabled),.btn-sm.btn-active:not(:disabled){padding:.3rem .4rem}}.header{background:linear-gradient(180deg,var(--bg-primary) 0%,rgba(249,250,251,.95) 100%);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow-md);position:fixed;width:100%;top:0;z-index:var(--z-sticky);height:var(--header-height);border-bottom:1px solid var(--border-color-light);transition:all var(--transition-base);display:flex;align-items:center;justify-content:space-between;padding:0 var(--spacing-lg)}.header-scrolled{box-shadow:var(--shadow-lg);background:var(--bg-primary)}.header-left{flex:1;display:flex;justify-content:flex-start}.header-center{flex:1;display:flex;justify-content:center}.header-right{flex:1;display:flex;justify-content:flex-end;gap:var(--spacing-md);align-items:center}.header-content{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 var(--spacing-lg);max-width:var(--content-max-width);margin:0 auto}.header-toggle-btn{background:transparent;border:none;font-size:1.5rem;cursor:pointer;padding:.5rem;color:var(--text-primary);transition:color var(--transition-fast);display:flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--border-radius-md)}.header-toggle-btn:hover{color:var(--color-primary);background-color:var(--bg-hover)}.header-logo{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);text-decoration:none;color:inherit;transition:all var(--transition-base);border:none;outline:none}.header-logo-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0}.header-logo-text{font-weight:600;font-size:21px}.header-logo:focus,.header-logo:focus-visible{outline:none;border:none;box-shadow:none}.header-logo-img{height:40px;width:auto;-o-object-fit:contain;object-fit:contain;border:none;outline:none}.header-brand{display:flex;align-items:center;gap:var(--spacing-sm)}.header-brand-icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);border-radius:var(--border-radius-md);color:var(--text-inverse);font-weight:var(--font-weight-bold);box-shadow:var(--shadow-sm)}.header-nav{display:flex;align-items:center;gap:var(--spacing-sm)}.header-credits{display:flex;align-items:center}.header-nav-item{padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--text-secondary);text-decoration:none;transition:all var(--transition-fast);position:relative}.header-nav-item:hover{color:var(--color-primary);background-color:var(--bg-hover)}.header-nav-item.active{color:var(--color-primary);background-color:#6366f11a}.header-nav-item.active:before{content:"";position:absolute;bottom:0;left:var(--spacing-md);right:var(--spacing-md);height:2px;background:var(--color-primary);border-radius:var(--border-radius-full);pointer-events:none}.header-actions{display:flex;align-items:center;gap:var(--spacing-md)}.header-user{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--border-radius-lg);font-size:var(--font-size-sm);color:var(--text-secondary);background:var(--bg-secondary);transition:all var(--transition-fast);cursor:pointer;border:1px solid transparent}.header-user:hover{background:var(--bg-hover);border-color:var(--border-color);box-shadow:var(--shadow-sm)}.header-user-avatar{width:32px;height:32px;border-radius:var(--border-radius-full);background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);display:flex;align-items:center;justify-content:center;color:var(--text-inverse);font-weight:var(--font-weight-semibold);font-size:var(--font-size-sm);box-shadow:var(--shadow-sm)}.header-user-info{display:flex;flex-direction:column;align-items:flex-start}.header-user-name{font-weight:var(--font-weight-medium);color:var(--text-primary);line-height:1.2;font-size:var(--font-size-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:150px}.header-logout-btn{background:transparent;border:none;cursor:pointer;color:#6b7280;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center;width:32px;min-width:32px;height:44px;min-height:44px;border-radius:var(--border-radius-md);padding:0}.header-logout-icon{width:24px;height:24px;transition:all var(--transition-fast)}.header-logout-btn:hover{color:#4b5563;background-color:var(--bg-hover)}.header-user-role{font-size:var(--font-size-xs);color:var(--text-tertiary);line-height:1.2}.header-divider{width:1px;height:24px;background:var(--border-color)}.header-menu-toggle{display:none;width:var(--touch-target-min);height:var(--touch-target-min);border:none;background:none;cursor:pointer;color:var(--text-primary);padding:var(--spacing-xs);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.header-menu-toggle:hover{background-color:var(--bg-hover)}.header-notification-badge{position:relative}.header-notification-badge:after{content:attr(data-count);position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;padding:0 4px;background:linear-gradient(135deg,var(--color-error) 0%,var(--color-error-dark) 100%);color:var(--text-inverse);border-radius:var(--border-radius-full);font-size:10px;font-weight:var(--font-weight-bold);display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px #ef44444d;animation:pulse 2s infinite;pointer-events:none}@media (max-width: 768px){.header{position:fixed;width:100%;z-index:var(--z-fixed);padding:0 var(--spacing-md)}.header-left{flex:0 0 auto;display:flex;justify-content:flex-start;align-items:center}.header-toggle-btn{display:flex;font-size:1.5rem;color:var(--text-primary);background:transparent;border:none;cursor:pointer;padding:.5rem;min-width:44px;min-height:44px;align-items:center;justify-content:center;border-radius:var(--border-radius-md)}.header-toggle-btn:hover{color:var(--color-primary);background-color:var(--bg-hover)}.header-content{padding:0 var(--spacing-md);max-width:100%;width:100%}.header-logo{font-size:var(--font-size-lg);flex:1;justify-content:center}.header-user-name{display:none}.header-brand-icon{width:28px;height:28px}.header-nav{display:flex;gap:var(--spacing-xs);font-size:var(--font-size-sm)}.header-user{font-size:var(--font-size-xs);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:var(--spacing-xs)}.header-menu-toggle{display:flex;align-items:center;justify-content:center}.header-user-info,.header-divider{display:none}}@media (max-width: 480px){.header-user-name,.header-user-role{display:none}}@media (prefers-reduced-motion: reduce){.header,.header-logo,.header-nav-item,.header-user,.header-menu-toggle{transition:none}@keyframes 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100%);pointer-events:none}.notification>*{position:relative;z-index:1}.notification-success{border-left-color:#2563eb;color:var(--color-success)}.notification-error{border-left-color:#600;color:var(--color-error)}.notification-warning{border-left-color:var(--color-warning);color:var(--color-warning)}.notification-warning:after{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(180deg,var(--color-warning-light) 0%,var(--color-warning-dark) 100%);animation:shimmer 2s infinite}.notification-info{border-left-color:var(--color-info);color:var(--color-info)}.notification-info:after{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(180deg,var(--color-info-light) 0%,var(--color-info-dark) 100%);animation:shimmer 2s infinite}.notification-content{flex:1;display:flex;flex-direction:column;gap:var(--spacing-xs)}.notification-title{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin:0}.notification-message{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:var(--line-height-normal);margin:0}.notification-icon{width:20px;height:20px;flex-shrink:0;display:flex;align-items:center;justify-content:center;margin-top:2px}.notification-close{background:none;border:none;font-size:1.25rem;line-height:1;color:var(--text-secondary);cursor:pointer;padding:0;min-width:var(--touch-target-min);min-height:var(--touch-target-min);width:2rem;height:2rem;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius-md);transition:all var(--transition-fast);flex-shrink:0}.notification-close:hover{background-color:var(--bg-hover);color:var(--text-primary)}.notification-close:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.notification-exit{animation:bounceOutRight .5s both forwards}.notification-collapsing{overflow:hidden;transition:height .3s ease-out,padding .3s ease-out,margin .3s ease-out;opacity:0}.notification-progress{position:absolute;bottom:0;left:0;height:3px;background:currentColor;opacity:.3;animation:progress linear;transform-origin:left}@keyframes bounceInRight{0%,60%,75%,90%,to{animation-timing-function:cubic-bezier(.215,.61,.355,1)}0%{opacity:0}60%{opacity:1}}@keyframes bounceOutRight{20%{opacity:1}to{opacity:0}}@keyframes shimmer{0%,to{opacity:1}50%{opacity:.6}}.notification:hover{box-shadow:var(--shadow-2xl)}@media (max-width: 768px){.notifications-container{left:var(--spacing-md);right:var(--spacing-md);top:calc(var(--header-height) + var(--spacing-md));max-width:none}.notification{min-width:auto;padding:var(--spacing-md)}.notification-title,.notification-message{font-size:var(--font-size-xs)}}@media (prefers-reduced-motion: reduce){.notification{animation:fadeIn .3s ease-in}.notification-exit{animation:fadeOut .2s ease-out forwards}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}}.spinner{display:inline-block;border-radius:50%;position:relative;animation:spin .8s linear infinite}.spinner{border:3px solid var(--color-gray-200);border-top-color:var(--color-primary);border-right-color:var(--color-primary-light);border-bottom-color:transparent}.spinner-sm{width:1rem;height:1rem;border-width:2px}.spinner-md{width:2rem;height:2rem;border-width:3px}.spinner-lg{width:3rem;height:3rem;border-width:4px}.spinner-xl{width:4rem;height:4rem;border-width:5px}.spinner-primary{border-color:var(--color-gray-200);border-top-color:var(--color-primary);border-right-color:var(--color-primary-light)}.spinner-secondary{border-color:var(--color-gray-200);border-top-color:var(--color-secondary);border-right-color:var(--color-secondary-light)}.spinner-success{border-color:var(--color-gray-200);border-top-color:var(--color-success);border-right-color:var(--color-success-light)}.spinner-error{border-color:var(--color-gray-200);border-top-color:var(--color-error);border-right-color:var(--color-error-light)}.spinner-white{border-color:#ffffff4d;border-top-color:var(--color-white);border-right-color:#fffc}.spinner-dots{width:2rem;height:2rem;position:relative;border:none;animation:none}.spinner-dots:before,.spinner-dots:after{content:"";position:absolute;width:8px;height:8px;border-radius:50%;background-color:var(--color-primary);animation:dotPulse 1.4s infinite ease-in-out both}.spinner-dots:before{left:0;animation-delay:-.32s}.spinner-dots:after{right:0;animation-delay:0s}.spinner-dots-sm{width:1.5rem;height:1.5rem}.spinner-dots-sm:before,.spinner-dots-sm:after{width:6px;height:6px}.spinner-dots-lg{width:3rem;height:3rem}.spinner-dots-lg:before,.spinner-dots-lg:after{width:12px;height:12px}.spinner-pulse{border:none;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-secondary) 100%);animation:pulse 1.5s cubic-bezier(.4,0,.6,1) infinite}.spinner-container{display:flex;align-items:center;justify-content:center;min-height:100px;width:100%}.spinner-container-fullscreen{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#ffffffe6;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:var(--z-modal);display:flex;align-items:center;justify-content:center}.spinner-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background-color:#fffc;display:flex;align-items:center;justify-content:center;z-index:var(--z-dropdown);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.spinner-with-text{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md)}.spinner-text{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:var(--font-weight-medium)}@keyframes dotPulse{0%,80%,to{opacity:.5}40%{opacity:1}}.spinner-shimmer{background:linear-gradient(90deg,var(--color-gray-200) 0%,var(--color-gray-100) 50%,var(--color-gray-200) 100%);background-size:200% 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var(--transition-base);outline:none;position:relative;z-index:1}.input-field::-moz-placeholder{color:var(--text-tertiary);-moz-transition:color var(--transition-fast);transition:color var(--transition-fast)}.input-field::placeholder{color:var(--text-tertiary);transition:color var(--transition-fast)}.input-field:hover:not(:disabled){border-color:var(--color-gray-400);background-color:var(--bg-secondary)}.input-field:hover::-moz-placeholder{color:var(--text-secondary)}.input-field:hover::placeholder{color:var(--text-secondary)}.input-focused,.input-field:focus{border-color:var(--color-primary);box-shadow:var(--input-focus-ring);background-color:var(--bg-primary)}.input-error{border-color:var(--color-error)}.input-error:focus{border-color:var(--color-error);box-shadow:0 0 0 3px 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th{padding:1rem 1.5rem;text-align:left;font-size:var(--font-size-sm);font-weight:600;color:var(--gray-700);background-color:var(--gray-100);border-bottom:2px solid var(--gray-200)}.lesson-management-table td{padding:1rem 1.5rem;border-bottom:1px solid var(--gray-200)}.lesson-management-table tbody tr:nth-child(2n){background-color:var(--gray-50)}.lesson-management-table tbody tr:hover{background-color:var(--gray-100);transition:background-color var(--transition-fast)}.lesson-datetime{display:flex;flex-direction:column;gap:var(--spacing-1)}.lesson-time{font-size:var(--font-size-sm);color:var(--gray-500)}.capacity-indicator{display:inline-block;padding:var(--spacing-1) var(--spacing-3);border-radius:var(--border-radius);font-size:var(--font-size-sm);font-weight:500;background:var(--success-light);color:var(--success)}.capacity-indicator.full{background:var(--error-light);color:var(--error)}.lesson-actions{display:flex;gap:var(--spacing-2);flex-wrap:wrap;align-items:center}.lesson-actions 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.value{font-size:1.5rem;font-weight:800;font-family:monospace}.accrued{background:#10b98114;color:#065f46}.paid{background:#3b82f614;color:#1e40af}.pending{background:#f59e0b14;color:#92400e}.modal-chart-section{background:#f9fafb;padding:1.5rem;border-radius:20px}.section-title{display:flex;align-items:center;gap:.5rem;margin-bottom:1rem;color:#4b5563}.section-title h4{margin:0;font-size:.95rem;font-weight:700}.unpaid-list-section{display:flex;flex-direction:column;gap:1.25rem}.section-header-row{display:flex;justify-content:space-between;align-items:center}.title-with-count{display:flex;align-items:center;gap:.75rem;color:#111827}.title-with-count h4{margin:0;font-size:1.1rem;font-weight:700}.count-pill{background:#e5e7eb;color:#4b5563;padding:.1rem 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