:root{--bg-primary: #0B0B0D;--bg-secondary: #151518;--bg-surface: #1C1C20;--bg-hover: #232328;--bg-active: #2A2A30;--text-primary: #F5F5F7;--text-secondary: #A1A1AA;--text-muted: #6B6B75;--text-disabled: #4A4A52;--accent: #0A84FF;--accent-hover: #409CFF;--accent-muted: rgba(10, 132, 255, .15);--accent-subtle: rgba(10, 132, 255, .08);--success: #34C759;--success-muted: rgba(52, 199, 89, .15);--warning: #FF9F0A;--warning-muted: rgba(255, 159, 10, .15);--error: #FF453A;--error-muted: rgba(255, 69, 58, .15);--border-subtle: rgba(255, 255, 255, .06);--border-default: rgba(255, 255, 255, .1);--border-strong: rgba(255, 255, 255, .15);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .5);--shadow-focus: 0 0 0 3px rgba(10, 132, 255, .25);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;--font-mono: "SF Mono", "Fira Code", "Consolas", monospace;--text-xs: .6875rem;--text-sm: .8125rem;--text-base: .9375rem;--text-lg: 1.0625rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--weight-normal: 400;--weight-medium: 500;--weight-semibold: 600;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-full: 9999px;--sidebar-width: 240px;--sidebar-collapsed: 72px;--content-max-width: 1200px;--header-height: 64px;--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{font-family:var(--font-family);font-size:var(--text-base);line-height:1.5;color:var(--text-primary);background-color:var(--bg-primary);min-height:100vh;overflow-x:hidden}#root{min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,select,textarea{font-family:inherit;font-size:inherit}ul,ol{list-style:none}img{max-width:100%;display:block}.app{display:flex;min-height:100vh}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--bg-secondary);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;z-index:100;transition:width var(--transition-slow)}.sidebar-header{padding:var(--space-5) var(--space-5);border-bottom:1px solid var(--border-subtle)}.sidebar-logo{display:flex;align-items:center;gap:var(--space-3)}.sidebar-logo-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--accent),#5856D6);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-weight:var(--weight-semibold);font-size:var(--text-sm);color:#fff}.sidebar-logo-text{font-size:var(--text-lg);font-weight:var(--weight-semibold);color:var(--text-primary);letter-spacing:-.02em}.sidebar-nav{flex:1;padding:var(--space-4) var(--space-3);overflow-y:auto}.nav-section{margin-bottom:var(--space-6)}.nav-section-title{font-size:var(--text-xs);font-weight:var(--weight-medium);color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;padding:0 var(--space-3);margin-bottom:var(--space-2)}.nav-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);color:var(--text-secondary);font-size:var(--text-sm);font-weight:var(--weight-medium);transition:all var(--transition-fast);position:relative;margin-bottom:2px}.nav-item:hover{background:var(--bg-surface);color:var(--text-primary)}.nav-item.active{background:var(--accent-subtle);color:var(--accent)}.nav-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.nav-icon{width:20px;height:20px;display:flex;align-items:center;justify-content:center;opacity:.8}.nav-item.active .nav-icon{opacity:1}.sidebar-footer{padding:var(--space-4);border-top:1px solid var(--border-subtle)}.main{flex:1;margin-left:var(--sidebar-width);min-height:100vh;display:flex;flex-direction:column}.main-header{position:sticky;top:0;height:var(--header-height);background:#0b0b0dcc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-6);z-index:50}.main-header-title{font-size:var(--text-xl);font-weight:var(--weight-semibold);color:var(--text-primary);letter-spacing:-.02em}.main-header-actions{display:flex;align-items:center;gap:var(--space-3)}.main-content{flex:1;padding:var(--space-6);max-width:var(--content-max-width);width:100%;margin:0 auto}.card{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden}.card-header{padding:var(--space-5);border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between}.card-title{font-size:var(--text-base);font-weight:var(--weight-semibold);color:var(--text-primary)}.card-subtitle{font-size:var(--text-sm);color:var(--text-muted);margin-top:var(--space-1)}.card-body{padding:var(--space-5)}.card-footer{padding:var(--space-4) var(--space-5);border-top:1px solid var(--border-subtle);background:var(--bg-surface)}.card.card-flush{border:none;background:transparent}.card.card-elevated{box-shadow:var(--shadow-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:var(--weight-medium);border-radius:var(--radius-md);transition:all var(--transition-fast);white-space:nowrap;height:36px}.btn:focus-visible{outline:none;box-shadow:var(--shadow-focus)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:active{transform:scale(.98)}.btn-secondary{background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover{background:var(--bg-hover);border-color:var(--border-strong)}.btn-ghost{color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-surface);color:var(--text-primary)}.btn-icon{width:36px;height:36px;padding:0;border-radius:var(--radius-md)}.btn-sm{height:30px;padding:var(--space-1) var(--space-3);font-size:var(--text-xs)}.btn-lg{height:44px;padding:var(--space-3) var(--space-6);font-size:var(--text-base)}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-secondary);margin-bottom:var(--space-2)}.form-input,.form-select,.form-textarea{width:100%;height:40px;padding:0 var(--space-3);background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--text-sm);transition:all var(--transition-fast)}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-muted)}.form-input:hover,.form-select:hover,.form-textarea:hover{border-color:var(--border-strong)}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--accent);box-shadow:var(--shadow-focus)}.form-textarea{height:auto;min-height:100px;padding:var(--space-3);resize:vertical}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23A1A1AA' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-3) center;padding-right:var(--space-10)}.form-hint{font-size:var(--text-xs);color:var(--text-muted);margin-top:var(--space-1)}.form-error{font-size:var(--text-xs);color:var(--error);margin-top:var(--space-1)}.form-check{display:flex;align-items:center;gap:var(--space-2);cursor:pointer}.form-check-input{width:18px;height:18px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--bg-surface);transition:all var(--transition-fast);-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer}.form-check-input:checked{background:var(--accent);border-color:var(--accent);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 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var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-5)}.stat-label{font-size:var(--text-sm);color:var(--text-muted);margin-bottom:var(--space-1)}.stat-value{font-size:var(--text-2xl);font-weight:var(--weight-semibold);color:var(--text-primary);letter-spacing:-.02em}.stat-change{display:inline-flex;align-items:center;gap:var(--space-1);font-size:var(--text-xs);font-weight:var(--weight-medium);margin-top:var(--space-2)}.stat-change.positive{color:var(--success)}.stat-change.negative{color:var(--error)}.calendar-strip{display:flex;gap:var(--space-2);overflow-x:auto;padding:var(--space-2) 0;scrollbar-width:none}.calendar-strip::-webkit-scrollbar{display:none}.calendar-day{flex-shrink:0;width:56px;padding:var(--space-3) var(--space-2);background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);text-align:center;cursor:pointer;transition:all var(--transition-fast)}.calendar-day:hover{background:var(--bg-hover);border-color:var(--border-default)}.calendar-day.today{border-color:var(--accent)}.calendar-day.selected{background:var(--accent-subtle);border-color:var(--accent)}.calendar-day-weekday{font-size:var(--text-xs);color:var(--text-muted);text-transform:uppercase;margin-bottom:var(--space-1)}.calendar-day-number{font-size:var(--text-lg);font-weight:var(--weight-semibold);color:var(--text-primary)}.calendar-day.selected .calendar-day-number{color:var(--accent)}.calendar-day-dot{width:4px;height:4px;background:var(--accent);border-radius:var(--radius-full);margin:var(--space-1) auto 0}.schedule-grid{display:grid;grid-template-columns:1fr 320px;gap:var(--space-5)}@media(max-width:1024px){.schedule-grid{grid-template-columns:1fr}}.lesson-list{display:flex;flex-direction:column;gap:var(--space-3)}.lesson-card{background:var(--bg-secondary);border:1px solid 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var(--border-subtle);border-radius:var(--radius-lg);position:sticky;top:calc(var(--header-height) + var(--space-6))}.detail-panel-header{padding:var(--space-5);border-bottom:1px solid var(--border-subtle);display:flex;align-items:flex-start;justify-content:space-between}.detail-panel-body{padding:var(--space-5)}.detail-panel-section{margin-bottom:var(--space-5)}.detail-panel-section:last-child{margin-bottom:0}.detail-panel-section-title{font-size:var(--text-xs);font-weight:var(--weight-medium);color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-3)}.student-list{display:flex;flex-direction:column;gap:var(--space-2)}.student-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3);background:var(--bg-surface);border-radius:var(--radius-md);transition:background var(--transition-fast)}.student-row:hover{background:var(--bg-hover)}.student-info{display:flex;align-items:center;gap:var(--space-3)}.student-avatar{width:32px;height:32px;border-radius:var(--radius-full);background:var(--bg-hover);display:flex;align-items:center;justify-content:center;font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-secondary)}.student-name{font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-primary)}.student-group{font-size:var(--text-xs);color:var(--text-muted)}.attendance-buttons{display:flex;gap:var(--space-1)}.attendance-btn{width:28px;height:28px;border-radius:var(--radius-sm);border:1px solid var(--border-subtle);background:var(--bg-secondary);display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);transition:all var(--transition-fast)}.attendance-btn:hover{border-color:var(--border-default)}.attendance-btn.present{background:var(--success-muted);border-color:var(--success);color:var(--success)}.attendance-btn.late{background:var(--warning-muted);border-color:var(--warning);color:var(--warning)}.attendance-btn.absent{background:var(--error-muted);border-color:var(--error);color:var(--error)}.empty-state{text-align:center;padding:var(--space-10) var(--space-6)}.empty-state-icon{width:48px;height:48px;margin:0 auto var(--space-4);color:var(--text-muted);opacity:.5}.empty-state-title{font-size:var(--text-base);font-weight:var(--weight-medium);color:var(--text-primary);margin-bottom:var(--space-2)}.empty-state-description{font-size:var(--text-sm);color:var(--text-muted);max-width:300px;margin:0 auto}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:all var(--transition-base)}.modal-overlay.open{opacity:1;visibility:visible}.modal{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);width:100%;max-width:480px;max-height:85vh;overflow:hidden;transform:scale(.95) translateY(10px);transition:transform var(--transition-base)}.modal-overlay.open .modal{transform:scale(1) translateY(0)}.modal-header{padding:var(--space-5);border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:var(--text-lg);font-weight:var(--weight-semibold);color:var(--text-primary)}.modal-close{width:32px;height:32px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all var(--transition-fast)}.modal-close:hover{background:var(--bg-surface);color:var(--text-primary)}.modal-body{padding:var(--space-5);overflow-y:auto}.modal-footer{padding:var(--space-4) var(--space-5);border-top:1px solid var(--border-subtle);display:flex;justify-content:flex-end;gap:var(--space-3)}.segment{padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.skeleton{background:linear-gradient(90deg,var(--bg-surface) 0%,var(--bg-hover) 50%,var(--bg-surface) 100%);background-size:200% 100%;animation:skeleton-shimmer 1.5s ease-in-out infinite;border-radius:var(--radius-sm)}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-text{height:14px;margin-bottom:var(--space-2)}.skeleton-text:last-child{width:60%}.skeleton-heading{height:20px;width:50%;margin-bottom:var(--space-3)}.skeleton-avatar{width:40px;height:40px;border-radius:var(--radius-full)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-8px)}to{opacity:1;transform:translate(0)}}.animate-fade-in{animation:fadeIn var(--transition-base) ease-out}.animate-slide-up{animation:slideUp var(--transition-base) ease-out}.animate-slide-in{animation:slideIn var(--transition-base) ease-out}.stagger-1{animation-delay:0ms}.stagger-2{animation-delay:50ms}.stagger-3{animation-delay:.1s}.stagger-4{animation-delay:.15s}.stagger-5{animation-delay:.2s}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-1{gap:var(--space-1)}.gap-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-5{gap:var(--space-5)}.gap-6{gap:var(--space-6)}.text-primary{color:var(--text-primary)}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-accent{color:var(--accent)}.text-sm{font-size:var(--text-sm)}.text-base{font-size:var(--text-base)}.text-lg{font-size:var(--text-lg)}.font-medium{font-weight:var(--weight-medium)}.font-semibold{font-weight:var(--weight-semibold)}.w-full{width:100%}.h-full{height:100%}.mt-1{margin-top:var(--space-1)}.mt-2{margin-top:var(--space-2)}.mt-3{margin-top:var(--space-3)}.mt-4{margin-top:var(--space-4)}.mb-1{margin-bottom:var(--space-1)}.mb-2{margin-bottom:var(--space-2)}.mb-3{margin-bottom:var(--space-3)}.mb-4{margin-bottom:var(--space-4)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--bg-active)}*{scrollbar-width:thin;scrollbar-color:var(--bg-hover) transparent}.mobile-menu-btn,.mobile-bottom-nav{display:none!important}.mobile-bottom-nav{position:fixed;bottom:0;left:0;right:0;height:64px;background:var(--bg-secondary);border-top:1px solid var(--border-subtle);display:none;justify-content:space-around;align-items:center;padding:0 var(--space-2);z-index:100;padding-bottom:env(safe-area-inset-bottom,0)}.mobile-nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-1);padding:var(--space-2);border-radius:var(--radius-md);color:var(--text-muted);transition:all var(--transition-fast);flex:1;max-width:80px}.mobile-nav-item.active{color:var(--accent)}.mobile-nav-icon{width:24px;height:24px;display:flex;align-items:center;justify-content:center}.mobile-nav-label{font-size:10px;font-weight:var(--weight-medium);text-align:center;white-space:nowrap}.mobile-nav-item.active:after{content:"";position:absolute;top:4px;width:4px;height:4px;background:var(--accent);border-radius:var(--radius-full)}.mobile-nav-item{position:relative}@media(min-width:1025px){.sidebar{width:var(--sidebar-width)}.main{margin-left:var(--sidebar-width)}.dashboard-grid,.schedule-grid{grid-template-columns:1fr 360px}.card-body{padding:var(--space-6)}.table th:nth-child(n+4),.table td:nth-child(n+4){display:table-cell}}@media(max-width:1024px)and (min-width:769px){.sidebar{width:var(--sidebar-collapsed)}.sidebar-logo-text,.nav-item 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var(--space-4);font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-secondary);background:transparent;border-radius:var(--radius-sm);white-space:nowrap;transition:all var(--transition-fast)}.tab:hover{color:var(--text-primary);background:var(--bg-hover)}.tab.active{color:var(--text-primary);background:var(--bg-primary);box-shadow:var(--shadow-sm)}.tab svg{width:16px;height:16px}.weekly-schedule-grid{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden}.weekly-schedule-header{display:grid;grid-template-columns:60px repeat(7,1fr);background:var(--bg-surface);border-bottom:1px solid var(--border-subtle)}.weekly-schedule-header .weekly-time-column{border-right:1px solid var(--border-subtle)}.weekly-schedule-header .weekly-day-header{position:relative;padding:var(--space-3);text-align:center;border-left:1px solid var(--border-subtle);transition:background var(--transition-fast)}.weekly-schedule-header .weekly-day-header.today{background:var(--accent-subtle)}.weekly-schedule-header .weekly-day-header.today .weekly-day-number{color:var(--accent)}.weekly-schedule-header .weekly-day-header.holiday{background:var(--warning-muted)}.weekly-schedule-body{display:grid;grid-template-columns:60px repeat(7,1fr);min-height:720px;position:relative}.weekly-schedule-body .weekly-time-column{border-right:1px solid var(--border-subtle)}.weekly-schedule-body .weekly-day-column{position:relative;border-left:1px solid var(--border-subtle);min-height:720px}.weekly-schedule-body .weekly-day-column.today{background:var(--accent-subtle)}.weekly-schedule-body .weekly-day-column.holiday{background:var(--warning-muted)}.weekly-empty-day{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;opacity:.5}.weekly-holiday-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-2);background:var(--warning-muted);color:var(--warning);font-size:var(--text-sm);font-weight:var(--weight-medium)}.weekly-holiday-overlay svg{width:24px;height:24px}.weekly-holiday-badge{position:absolute;top:var(--space-1);right:var(--space-1);width:20px;height:20px;display:flex;align-items:center;justify-content:center;color:var(--warning)}.weekly-holiday-badge svg{width:14px;height:14px}.weekly-lesson.cancelled{opacity:.6;border:1px dashed var(--border-strong);background:var(--bg-surface)!important;color:var(--text-muted)}.weekly-lesson-cancelled{display:flex;align-items:center;gap:var(--space-1);margin-top:var(--space-1);font-size:10px;color:var(--error)}.weekly-lesson-cancelled svg{width:12px;height:12px}.legend-dot{width:12px;height:12px;border-radius:var(--radius-full);flex-shrink:0}.legend-dot.cancelled{background:var(--bg-surface);border:2px dashed var(--border-strong)}.legend-dot.today{background:var(--accent-subtle);border:2px solid var(--accent)}.form-row{display:flex;gap:var(--space-3)}.form-row .form-group{flex:1}@media(max-width:480px){.form-row{flex-direction:column;gap:0}}.detail-panel-section .flex{display:flex}.detail-panel-section .flex.gap-2{gap:var(--space-2)}.detail-panel-section .flex.flex-wrap,.flex-wrap{flex-wrap:wrap}.justify-end{justify-content:flex-end}.items-start{align-items:flex-start}.card .mb-4{margin-bottom:var(--space-4)}.card-body .flex-wrap{flex-wrap:wrap}.card-body .gap-3{gap:var(--space-3)}@media(max-width:768px){.weekly-schedule-grid{overflow-x:auto;-webkit-overflow-scrolling:touch}.weekly-schedule-header,.weekly-schedule-body{min-width:700px}.schedule-grid{grid-template-columns:1fr}.detail-panel{position:static;margin-top:var(--space-4)}}