:root{--primary: #0052CC;--primary-light: #D4E2FF;--primary-dark: #0747A6;--text-primary: #172B4D;--text-secondary: #505F79;--text-tertiary: #6B778C;--text-disabled: #8993A4;--bg-primary: #FFFFFF;--bg-secondary: #F4F5F7;--bg-tertiary: #EBECF0;--success: #36B37E;--warning: #FFAB00;--error: #FF5630;--info: #0065FF;--priority-high: #FF5630;--priority-medium: #FFAB00;--priority-low: #36B37E;--border-light: #DFE1E6;--border-medium: #C1C7D0;--border-dark: #97A0AF;--shadow-sm: 0 1px 2px rgba(9, 30, 66, .15);--shadow-md: 0 4px 8px rgba(9, 30, 66, .15);--shadow-lg: 0 8px 16px rgba(9, 30, 66, .15);--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: 12px;--font-size-sm: 14px;--font-size-md: 16px;--font-size-lg: 18px;--font-size-xl: 20px;--font-size-2xl: 24px;--focus-ring: 0 0 0 3px rgba(0, 82, 204, .5)}@media (prefers-contrast: high){:root{--text-primary: #000000;--text-secondary: #333333;--border-light: #000000;--primary: #0000EE}}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}*{box-sizing:border-box}body{margin:0;font-family:var(--font-family);background:linear-gradient(135deg,#f5f7fa 0%,#e4e8f0 100%);min-height:100vh;padding:var(--spacing-md);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{max-width:1200px;margin:0 auto}.app{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden;min-height:calc(100vh - 32px)}.app-header{background:var(--primary);color:#fff;padding:var(--spacing-lg) var(--spacing-xl);display:flex;justify-content:space-between;align-items:center;border-bottom:3px solid var(--primary-dark)}.header-content h1{margin:0;font-size:var(--font-size-2xl);font-weight:700}.subtitle{margin:var(--spacing-xs) 0 0;opacity:.9;font-size:var(--font-size-sm)}.header-actions{display:flex;gap:var(--spacing-sm)}.icon-btn{background:rgba(255,255,255,.2);border:none;border-radius:var(--radius-md);width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;font-size:var(--font-size-lg);transition:background-color .2s}.icon-btn:hover{background:rgba(255,255,255,.3)}.icon-btn:focus{outline:3px solid white;outline-offset:2px}.settings-panel{background:var(--bg-secondary);padding:var(--spacing-lg);border-bottom:1px solid var(--border-light);animation:slideDown .3s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.settings-panel h3{margin:0 0 var(--spacing-md);font-size:var(--font-size-lg)}.setting-item{margin-bottom:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-sm)}.setting-item label{display:flex;align-items:center;gap:var(--spacing-sm);cursor:pointer}.setting-item select{margin-left:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-sm);border:1px solid var(--border-medium);border-radius:var(--radius-sm);background:var(--bg-primary);color:var(--text-primary)}.controls-panel{padding:var(--spacing-lg) var(--spacing-xl);background:var(--bg-secondary);border-bottom:1px solid var(--border-light)}.search-container{position:relative;margin-bottom:var(--spacing-md);max-width:400px}.search-input{width:100%;padding:var(--spacing-sm) var(--spacing-lg);padding-right:40px;border:2px solid var(--border-medium);border-radius:var(--radius-md);font-size:var(--font-size-md);background:var(--bg-primary);color:var(--text-primary);transition:border-color .2s}.search-input:focus{outline:none;border-color:var(--primary);box-shadow:var(--focus-ring)}.search-input::placeholder{color:var(--text-disabled)}.clear-search-btn{position:absolute;right:var(--spacing-sm);top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-disabled);cursor:pointer;font-size:var(--font-size-lg);padding:var(--spacing-xs);line-height:1}.clear-search-btn:hover{color:var(--text-secondary)}.filters-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md);flex-wrap:wrap;gap:var(--spacing-md)}.filter-tabs{display:flex;gap:var(--spacing-xs);flex-wrap:wrap}.filter-tab{padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-tertiary);border:2px solid transparent;border-radius:var(--radius-md);color:var(--text-secondary);font-weight:500;cursor:pointer;transition:all .2s;font-size:var(--font-size-sm)}.filter-tab:hover{background:var(--border-light);color:var(--text-primary)}.filter-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.filter-tab:focus{outline:none;box-shadow:var(--focus-ring)}.sort-controls{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-size-sm)}.sort-select{padding:var(--spacing-xs) var(--spacing-sm);border:2px solid var(--border-medium);border-radius:var(--radius-sm);background:var(--bg-primary);color:var(--text-primary);cursor:pointer}.sort-select:focus{outline:none;border-color:var(--primary);box-shadow:var(--focus-ring)}.category-filters{margin-bottom:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-primary);border-radius:var(--radius-md);border:1px solid var(--border-light)}.filter-label{font-weight:600;margin-right:var(--spacing-md);color:var(--text-secondary)}.category-buttons{display:flex;gap:var(--spacing-sm);flex-wrap:wrap;margin-top:var(--spacing-sm)}.category-btn{padding:var(--spacing-xs) var(--spacing-md);background:var(--bg-tertiary);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;font-size:var(--font-size-sm);transition:all .2s}.category-btn:hover{background:var(--border-light);color:var(--text-primary)}.category-btn.active{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.action-buttons{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.action-btn{padding:var(--spacing-sm) var(--spacing-lg);border:2px solid transparent;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all .2s;font-size:var(--font-size-sm);display:inline-flex;align-items:center;gap:var(--spacing-xs)}.action-btn:focus{outline:none;box-shadow:var(--focus-ring)}.action-btn.primary{background:var(--primary);color:#fff}.action-btn.primary:hover{background:var(--primary-dark)}.action-btn.secondary{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border-medium)}.action-btn.secondary:hover{background:var(--border-light)}.action-btn.warning{background:var(--warning);color:#fff}.action-btn.warning:hover{background:#DE9A00}.action-btn.info{background:var(--info);color:#fff}.action-btn.info:hover{background:#0052CC}.action-btn:disabled{opacity:.5;cursor:not-allowed}.notifications-container{flex:1;overflow-y:auto;max-height:600px}.notifications-header{padding:var(--spacing-lg) var(--spacing-xl);background:var(--bg-secondary);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:10}.header-main{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md)}.header-main h1{margin:0;font-size:var(--font-size-xl);display:flex;align-items:center;gap:var(--spacing-sm)}.header-icon{font-size:var(--font-size-lg)}.unread-count-badge{background:var(--error);color:#fff;border-radius:12px;padding:2px 8px;font-size:var(--font-size-sm);font-weight:600;min-width:24px;text-align:center}.stats{display:flex;gap:var(--spacing-lg)}.stat-item{color:var(--text-secondary);font-size:var(--font-size-sm)}.stat-item strong{color:var(--text-primary)}.bulk-actions{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-sm) 0;border-top:1px solid var(--border-light);padding-top:var(--spacing-md)}.select-all{display:flex;align-items:center;gap:var(--spacing-sm)}.select-all input[type=checkbox]{width:18px;height:18px;cursor:pointer}.select-all label{color:var(--text-secondary);font-size:var(--font-size-sm);cursor:pointer}.selected-actions{display:flex;gap:var(--spacing-sm)}.notifications-list{padding:0 var(--spacing-xl)}.notification-item{display:grid;grid-template-columns:auto auto auto 1fr auto;align-items:start;gap:var(--spacing-md);padding:var(--spacing-lg);background:var(--bg-primary);border-radius:var(--radius-md);margin-bottom:var(--spacing-sm);border:2px solid transparent;cursor:pointer;transition:all .2s;position:relative}.notification-item:hover{background:var(--bg-secondary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.notification-item.unread{border-left:4px solid var(--primary)}.notification-item.read{opacity:.8}.notification-item.selected{background:var(--primary-light);border-color:var(--primary)}.notification-select{display:flex;align-items:center}.notification-select input[type=checkbox]{width:20px;height:20px;cursor:pointer}.notification-icon{font-size:var(--font-size-lg);display:flex;align-items:center;justify-content:center;width:32px;height:32px}.avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;border:2px solid var(--bg-primary);box-shadow:var(--shadow-sm)}.notification-content{min-width:0}.sender-info{margin-bottom:var(--spacing-xs)}.sender-name{margin:0 0 var(--spacing-xs);font-size:var(--font-size-md);font-weight:600;color:var(--text-primary)}.notification-meta{display:flex;gap:var(--spacing-md);flex-wrap:wrap;align-items:center}.time{color:var(--text-tertiary);font-size:var(--font-size-sm)}.category{background:var(--bg-tertiary);color:var(--text-secondary);padding:2px 8px;border-radius:var(--radius-sm);font-size:var(--font-size-xs);font-weight:500;text-transform:uppercase;letter-spacing:.5px}.priority{color:#fff;padding:2px 8px;border-radius:var(--radius-sm);font-size:var(--font-size-xs);font-weight:600;text-transform:uppercase}.message{margin:var(--spacing-sm) 0 0;color:var(--text-secondary);font-size:var(--font-size-md);line-height:1.5}.notification-actions{display:flex;gap:var(--spacing-xs)}.mark-read-btn,.mark-unread-btn,.delete-btn{width:32px;height:32px;border-radius:var(--radius-sm);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:var(--font-size-md);transition:all .2s}.mark-read-btn{background:var(--success);color:#fff}.mark-read-btn:hover{background:#2E8B6F}.mark-unread-btn{background:var(--info);color:#fff}.mark-unread-btn:hover{background:#0052CC}.delete-btn{background:var(--error);color:#fff}.delete-btn:hover{background:#D93A1E}.empty-state{padding:var(--spacing-xl);text-align:center;color:var(--text-secondary)}.empty-icon{font-size:48px;margin-bottom:var(--spacing-md);opacity:.5}.empty-state h3{margin:0 0 var(--spacing-xs);color:var(--text-primary);font-size:var(--font-size-lg)}.empty-state p{margin:0;font-size:var(--font-size-md)}.pagination{padding:var(--spacing-lg) var(--spacing-xl);border-top:1px solid var(--border-light);text-align:center}.pagination-btn{padding:var(--spacing-sm) var(--spacing-xl);background:var(--bg-tertiary);border:2px solid var(--border-medium);border-radius:var(--radius-md);color:var(--text-primary);font-weight:600;cursor:pointer;transition:all .2s;font-size:var(--font-size-md)}.pagination-btn:hover{background:var(--border-light)}.app-footer{padding:var(--spacing-lg) var(--spacing-xl);background:var(--bg-secondary);border-top:1px solid var(--border-light);font-size:var(--font-size-sm);color:var(--text-secondary)}.footer-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--spacing-md)}.keyboard-shortcuts kbd{background:var(--bg-tertiary);border:1px solid var(--border-medium);border-radius:var(--radius-sm);padding:2px 6px;font-family:monospace;font-size:var(--font-size-xs);margin:0 4px}.status{font-weight:500}@media (max-width: 768px){body{padding:var(--spacing-xs)}.app{border-radius:var(--radius-md)}.app-header,.controls-panel,.notifications-header,.notifications-list,.app-footer{padding:var(--spacing-md)}.filters-row{flex-direction:column;align-items:stretch}.notification-item{grid-template-columns:1fr;gap:var(--spacing-sm)}.notification-actions{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm)}.notification-select{position:absolute;top:var(--spacing-sm);left:var(--spacing-sm)}.notification-icon{display:none}.avatar{width:40px;height:40px}.footer-content{flex-direction:column;text-align:center}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:3px solid var(--primary);outline-offset:2px}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh;padding:2rem}#root{max-width:1280px;margin:0 auto}