*{box-sizing:border-box;margin:0;padding:0}:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh;background-color:#f5f7f9;color:#212121}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;color:#212121}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}a{color:#1976d2;text-decoration:none;transition:color .2s ease}a:hover{color:#1565c0;text-decoration:underline}p{margin:.5em 0}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#888;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#555}:root{--primary-blue: #1976D2;--primary-blue-dark: #1565C0;--primary-blue-light: #42A5F5;--secondary-orange: #FF9800;--secondary-orange-dark: #F57C00;--secondary-orange-light: #FFB74D;--success-green: #4CAF50;--success-green-dark: #388E3C;--warning-yellow: #FFC107;--error-red: #F44336;--background: #F5F7F9;--surface: #FFFFFF;--border: #E0E0E0;--divider: #EEEEEE;--text-primary: #212121;--text-secondary: #616161;--text-disabled: #9E9E9E;--text-white: #FFFFFF;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 20px rgba(0, 0, 0, .12);--shadow-hover: 0 6px 12px rgba(0, 0, 0, .15);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Helvetica Neue", sans-serif}[data-theme=dark]{--primary-blue: #64B5F6;--primary-blue-dark: #42A5F5;--primary-blue-light: #90CAF9;--secondary-orange: 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ease;font-family:var(--font-family);display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);text-decoration:none;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background-color:var(--primary-blue);color:var(--text-white)}.btn-primary:hover:not(:disabled){background-color:var(--primary-blue-dark);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--secondary-orange);color:var(--text-white)}.btn-secondary:hover:not(:disabled){background-color:var(--secondary-orange-dark);box-shadow:var(--shadow-md)}.btn-success{background-color:var(--success-green);color:var(--text-white)}.btn-success:hover:not(:disabled){background-color:var(--success-green-dark);box-shadow:var(--shadow-md)}.btn-outline{background-color:transparent;border:2px solid var(--primary-blue);color:var(--primary-blue)}.btn-outline:hover:not(:disabled){background-color:var(--primary-blue);color:var(--text-white)}.btn-danger{background-color:var(--error-red);color:var(--text-white)}.btn-danger:hover:not(:disabled){background-color:#d32f2f;box-shadow:var(--shadow-md)}.btn-lg{padding:12px 28px;font-size:1rem}.btn-sm{padding:6px 12px;font-size:.8125rem}.btn-block{width:100%}.form-group{margin-bottom:var(--spacing-md)}.form-label{display:block;margin-bottom:var(--spacing-xs);color:var(--text-primary);font-weight:500;font-size:.875rem}.form-input,.form-textarea,.form-select{width:100%;padding:12px 14px;border:2px solid var(--border);border-radius:var(--radius-md);font-size:.9375rem;font-family:var(--font-family);transition:border-color .2s ease,box-shadow .2s ease,background-color .2s 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0}.navbar-content{padding:0 var(--spacing-md);flex-direction:column;gap:var(--spacing-sm);align-items:flex-start}.navbar-brand{font-size:1.25rem}.navbar-user{width:100%;flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.btn{width:100%;justify-content:center}.btn-sm{width:auto}.form-input,.form-textarea,.form-select{font-size:16px}.message-card{padding:var(--spacing-sm)}.message-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-xs)}.message-timestamp{font-size:.7rem}.action-bar{flex-direction:column}.action-bar input{width:100%!important}.action-bar button{width:100%}.page-header{margin-bottom:var(--spacing-lg)}.info-box{padding:var(--spacing-sm)}.empty-state{padding:var(--spacing-lg)}.empty-state-icon{font-size:2rem}}@media(min-width:641px)and (max-width:1024px){.container{padding:var(--spacing-lg) var(--spacing-md)}.navbar-content{padding:0 var(--spacing-md)}.grid-auto{grid-template-columns:repeat(2,1fr)}}@media(min-width:1440px){.container{max-width:1400px}}html{scroll-behavior:smooth}a{position:relative}a:not(.btn):not(.card-clickable):not(.navbar-brand):after{content:"";position:absolute;width:0;height:2px;bottom:-2px;left:0;background-color:var(--primary-blue);transition:width .3s ease}a:not(.btn):not(.card-clickable):not(.navbar-brand):hover:after{width:100%}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.loading{animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}.card{animation:fadeIn .3s ease-out}@media(hover:none)and (pointer:coarse){.btn:hover,.card-clickable:hover{transform:none}.btn:active{transform:scale(.96)}.card-clickable:active{transform:scale(.98)}}.btn:focus-visible,.form-input:focus-visible,.form-textarea:focus-visible,.form-select:focus-visible{outline:3px solid var(--primary-blue);outline-offset:2px}.btn,.badge,.navbar-brand{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.top-nav{background-color:var(--surface);box-shadow:var(--shadow-sm);padding:var(--spacing-md) 0;position:fixed;top:0;left:0;right:0;z-index:1000;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:none}.top-nav-content{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-lg)}.top-nav-brand{flex-shrink:0}.top-nav-links{display:flex;gap:var(--spacing-md);align-items:center}.top-nav-link{padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);color:var(--text-secondary);text-decoration:none;font-weight:500;transition:all .2s ease;position:relative}.top-nav-link:hover{color:var(--primary-blue);background-color:#1976d20d;text-decoration:none}.top-nav-link.active{color:var(--primary-blue);background-color:#1976d21a}.top-nav-link.active:after{display:none}.top-nav-user,.top-nav-right{display:flex;align-items:center;gap:var(--spacing-md)}.top-nav-profile-desktop{display:flex;align-items:center}.top-nav-profile-mobile{display:none}.profile-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary-blue) 0%,var(--primary-blue-dark) 100%);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.875rem;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 2px 8px #1976d24d;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}.profile-avatar:hover{transform:scale(1.05);box-shadow:0 4px 12px #1976d266}.profile-avatar:active{transform:scale(.95)}.top-nav-mobile-toggle{display:none}.top-nav-mobile-menu{position:absolute;top:100%;right:var(--spacing-lg);background:var(--surface);box-shadow:var(--shadow-lg);border-radius:var(--radius-lg);padding:var(--spacing-md);min-width:200px;animation:slideDown .2s ease-out}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background-color:var(--surface);box-shadow:0 -2px 10px #0000001a;display:flex;justify-content:space-around;padding:var(--spacing-xs) 0;z-index:1000;border-top:1px solid var(--divider)}.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;padding:var(--spacing-xs);color:var(--text-secondary);text-decoration:none;transition:all .2s ease;-webkit-tap-highlight-color:transparent}.bottom-nav-item:hover{text-decoration:none}.bottom-nav-item.active{color:var(--primary-blue)}.bottom-nav-icon{font-size:1.5rem;margin-bottom:2px}.bottom-nav-label{font-size:.7rem;font-weight:500}.page-content{min-height:calc(100vh - 120px);padding-top:60px;padding-bottom:70px}@media(min-width:769px){.top-nav{display:block}.bottom-nav{display:none}.page-content{padding-top:80px;padding-bottom:var(--spacing-lg)}.top-nav-profile-mobile{display:none}.top-nav-profile-desktop{display:flex}}@media(max-width:768px){.top-nav{display:block}.top-nav-links,.top-nav-profile-desktop{display:none}.top-nav-profile-mobile{display:flex}.top-nav-content{padding:0 var(--spacing-md)}.navbar-brand{font-size:1.125rem}.profile-avatar{width:36px;height:36px;font-size:.8125rem}}[data-theme=dark] .form-error{background-color:#e5737326;color:var(--error-red)}[data-theme=dark] .info-box,[data-theme=dark] .tab:hover{background-color:#64b5f61a}[data-theme=dark] .badge-primary{background-color:#64b5f633}[data-theme=dark] .badge-secondary{background-color:#b0b0b033}[data-theme=dark] .badge-success{background-color:#81c78433}[data-theme=dark] .badge-warning{background-color:#ffb74d33}[data-theme=dark] .top-nav-link:hover{background-color:#64b5f61a}[data-theme=dark] .top-nav-link.active{background-color:#64b5f626}[data-theme=dark] .btn-danger:hover:not(:disabled){background-color:#c62828}.notification-bell{position:relative}.bell-button{position:relative;background:none;border:none;font-size:1.5rem;cursor:pointer;padding:.5rem;display:flex;align-items:center;justify-content:center;transition:transform .2s ease}.bell-button:hover{transform:scale(1.1)}.bell-badge{position:absolute;top:0;right:0;background-color:#f44336;color:#fff;font-size:.625rem;font-weight:600;padding:.125rem .375rem;border-radius:10px;min-width:18px;text-align:center}.notification-dropdown{position:absolute;top:calc(100% + .5rem);right:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 4px 20px #00000026;width:360px;max-width:90vw;max-height:500px;display:flex;flex-direction:column;z-index:1000;animation:dropdownSlideIn .2s ease}@keyframes dropdownSlideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.notification-header{padding:1rem 1.25rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.notification-header h3{margin:0;font-size:1.125rem;font-weight:600;color:var(--text-primary)}.unread-count{font-size:.8125rem;color:var(--primary-blue);font-weight:500}.notification-list{overflow-y:auto;max-height:400px}.notification-loading{padding:2rem;text-align:center;color:var(--text-secondary)}.notification-empty{padding:2rem;text-align:center}.notification-empty .empty-icon{font-size:3rem;margin-bottom:.5rem;opacity:.5}.notification-empty p{margin:0;color:var(--text-secondary);font-size:.875rem}.notification-item{padding:1rem 1.25rem;border-bottom:1px solid var(--border-color);cursor:pointer;display:flex;gap:.75rem;align-items:flex-start;position:relative;transition:background-color .2s ease}.notification-item:last-child{border-bottom:none}.notification-item:hover{background-color:var(--background)}.notification-item.unread{background-color:#1976d214}.notification-item.unread:hover{background-color:#1976d226}.notification-icon{font-size:1.5rem;flex-shrink:0}.notification-content{flex:1;min-width:0}.notification-title{font-weight:600;font-size:.875rem;color:var(--text-primary);margin-bottom:.25rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.notification-preview{font-size:.8125rem;color:var(--text-secondary);margin-bottom:.5rem;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;line-height:1.4}.notification-meta{display:flex;gap:.5rem;align-items:center;font-size:.75rem;color:var(--text-muted)}.notification-classroom{font-weight:500;color:var(--primary-blue)}.notification-time:before{content:"•";margin-right:.5rem}.unread-dot{width:8px;height:8px;background-color:var(--primary-blue);border-radius:50%;flex-shrink:0;margin-top:.25rem}@media(max-width:768px){.notification-dropdown{width:320px;right:-1rem}.notification-header,.notification-item{padding:.875rem 1rem}}.fab-container{position:fixed;bottom:80px;right:1.5rem;z-index:999;display:flex;flex-direction:column;align-items:flex-end;gap:1rem}.fab-main{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,#1976d2,#1565c0);border:none;box-shadow:0 4px 12px #1976d266;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;z-index:1000}.fab-main:hover{transform:scale(1.1);box-shadow:0 6px 16px #1976d280}.fab-main:active{transform:scale(.95)}.fab-main.open{transform:rotate(45deg);background:linear-gradient(135deg,#f44336,#d32f2f);box-shadow:0 4px 12px #f4433666}.fab-main.open:hover{transform:rotate(45deg) scale(1.1)}.fab-icon{font-size:1.75rem;font-weight:300;color:#fff;line-height:1;transition:transform .3s ease}.fab-actions{display:flex;flex-direction:column;gap:.75rem;margin-bottom:.5rem;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fab-action{display:flex;align-items:center;gap:.75rem;background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:.75rem 1rem;cursor:pointer;box-shadow:0 2px 8px #00000026;transition:all .2s ease;white-space:nowrap;animation:slideIn .3s cubic-bezier(.4,0,.2,1) both}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.fab-action:hover{transform:translate(-4px);box-shadow:0 4px 12px #0003;background:var(--background)}.fab-action-icon{font-size:1.25rem;display:flex;align-items:center;justify-content:center}.fab-action-label{font-size:.875rem;font-weight:500;color:var(--text-primary)}@media(max-width:768px){.fab-container{right:1rem;bottom:70px}.fab-main{width:52px;height:52px}.fab-icon{font-size:1.5rem}.fab-action{padding:.625rem .875rem}.fab-action-label{font-size:.8125rem}}.modal-backdrop{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:#fff;border-radius:var(--radius-lg);width:100%;max-height:90vh;display:flex;flex-direction:column;box-shadow:0 10px 40px #0003;animation:slideUp .3s cubic-bezier(.4,0,.2,1)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-small{max-width:400px}.modal-medium{max-width:600px}.modal-large{max-width:800px}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border-color)}.modal-title{margin:0;font-size:1.25rem;font-weight:600;color:var(--text-primary)}.modal-close{background:none;border:none;font-size:1.5rem;color:var(--text-secondary);cursor:pointer;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s ease}.modal-close:hover{background:var(--background);color:var(--text-primary)}.modal-body{padding:1.5rem;overflow-y:auto;flex:1}@media(max-width:768px){.modal-backdrop{padding:.5rem}.modal-content{max-height:95vh}.modal-header{padding:1rem 1.25rem}.modal-title{font-size:1.125rem}.modal-body{padding:1.25rem}}