:root{--primary-color: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--secondary-color: #10b981;--danger-color: #ef4444;--danger-hover: #dc2626;--warning-color: #f59e0b;--text-primary: #1f2937;--text-secondary: #6b7280;--text-light: #9ca3af;--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--border-color: #e5e7eb;--border-light: #f3f4f6;--online-color: #10b981;--offline-color: #9ca3af;--typing-color: #f59e0b;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1);--transition-fast: .15s ease-in-out;--transition-normal: .25s ease-in-out;--transition-slow: .35s ease-in-out}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--bg-secondary);min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;margin-bottom:var(--spacing-md);color:var(--text-primary)}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.125rem}h5{font-size:1rem}h6{font-size:.875rem}p{margin-bottom:var(--spacing-md)}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary-hover);text-decoration:underline}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.container-small{max-width:500px}.container-medium{max-width:800px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:var(--spacing-lg)}.auth-card{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);padding:var(--spacing-2xl);width:100%;max-width:400px}.auth-logo{text-align:center;margin-bottom:var(--spacing-xl)}.auth-logo h1{color:var(--primary-color);font-size:2rem;margin-bottom:var(--spacing-sm)}.auth-logo p{color:var(--text-secondary);font-size:.875rem;margin-bottom:0}.form-group{margin-bottom:var(--spacing-lg)}.form-label{display:block;font-size:.875rem;font-weight:500;margin-bottom:var(--spacing-sm);color:var(--text-primary)}.form-input,.form-textarea,.form-select{width:100%;padding:.75rem var(--spacing-md);font-size:1rem;border:2px solid var(--border-color);border-radius:var(--radius-md);background-color:var(--bg-primary);color:var(--text-primary);transition:all var(--transition-fast)}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px var(--primary-light)}.form-input::placeholder{color:var(--text-light)}.form-textarea{min-height:100px;resize:vertical}.form-checkbox{display:flex;align-items:center;gap:var(--spacing-sm)}.form-checkbox input[type=checkbox]{width:1rem;height:1rem;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background-color:var(--border-color)}.btn-danger{background-color:var(--danger-color);color:#fff}.btn-danger:hover:not(:disabled){background-color:var(--danger-hover)}.btn-success{background-color:var(--secondary-color);color:#fff}.btn-outline{background-color:transparent;border:2px solid var(--border-color);color:var(--text-primary)}.btn-outline:hover:not(:disabled){border-color:var(--primary-color);color:var(--primary-color)}.btn-sm{padding:.5rem 1rem;font-size:.875rem}.btn-lg{padding:1rem 2rem;font-size:1.125rem}.btn-full{width:100%}.btn-icon{padding:.5rem;width:2.5rem;height:2.5rem}.card{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);overflow:hidden;transition:all var(--transition-fast)}.card:hover{box-shadow:var(--shadow-md)}.card-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-light);background-color:var(--bg-secondary)}.card-body{padding:var(--spacing-lg)}.card-footer{padding:var(--spacing-lg);border-top:1px solid var(--border-light);background-color:var(--bg-secondary)}.app-layout{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--bg-primary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.header-content{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);max-width:1400px;margin:0 auto}.header-logo{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.header-user{display:flex;align-items:center;gap:var(--spacing-md)}.user-info{display:flex;align-items:center;gap:var(--spacing-sm);font-size:.875rem;color:var(--text-secondary)}.app-main{flex:1;padding:var(--spacing-xl) 0}.rooms-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-xl)}.rooms-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.room-card{cursor:pointer;transition:all var(--transition-fast)}.room-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.room-card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--spacing-md)}.room-info h3{margin-bottom:var(--spacing-xs);color:var(--text-primary)}.room-meta{display:flex;align-items:center;gap:var(--spacing-md);font-size:.875rem;color:var(--text-secondary)}.room-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:.25rem .5rem;border-radius:var(--radius-full);font-size:.75rem;font-weight:500;background-color:var(--primary-light);color:var(--primary-color)}.room-badge.online{background-color:#d1fae5;color:var(--online-color)}.chat-layout{display:grid;grid-template-columns:300px 1fr;gap:var(--spacing-lg);max-width:1400px;margin:0 auto;height:calc(100vh - 140px)}.chat-sidebar{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden;display:flex;flex-direction:column}.sidebar-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-light);background-color:var(--bg-secondary)}.sidebar-section{padding:var(--spacing-md)}.sidebar-section h4{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-light);margin-bottom:var(--spacing-md)}.user-list{list-style:none}.user-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm);border-radius:var(--radius-md);margin-bottom:var(--spacing-xs);cursor:pointer;transition:background-color var(--transition-fast)}.user-item:hover{background-color:var(--bg-secondary)}.user-item.selected{background-color:var(--primary-light)}.user-status{width:.5rem;height:.5rem;border-radius:var(--radius-full);flex-shrink:0}.user-status.online{background-color:var(--online-color)}.user-status.offline{background-color:var(--offline-color)}.user-name{flex:1;font-size:.875rem;color:var(--text-primary)}.chat-main{display:flex;flex-direction:column;background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.chat-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-light);background-color:var(--bg-secondary);display:flex;align-items:center;justify-content:space-between}.chat-title{display:flex;align-items:center;gap:var(--spacing-md)}.chat-title h2{margin:0;font-size:1.25rem}.chat-actions{display:flex;gap:var(--spacing-sm)}.chat-messages{flex:1;overflow-y:auto;padding:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md);background-color:var(--bg-secondary)}.message{display:flex;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);animation:slideIn .2s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.message-own{background:var(--primary-light);border-left:3px solid var(--primary-color)}.message.message-private{background:#fef3c7;border-left:3px solid var(--warning-color)}.message-avatar{width:2.5rem;height:2.5rem;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;flex-shrink:0}.message-content{flex:1;min-width:0}.message-header{display:flex;align-items:baseline;gap:var(--spacing-sm);margin-bottom:var(--spacing-xs)}.message-author{font-weight:600;color:var(--text-primary);font-size:.875rem}.message-badge{padding:.125rem .375rem;border-radius:var(--radius-sm);font-size:.625rem;font-weight:600;text-transform:uppercase;background-color:var(--warning-color);color:#fff}.message-time{font-size:.75rem;color:var(--text-light);margin-left:auto}.message-text{color:var(--text-primary);word-wrap:break-word;line-height:1.5}.message-status{display:flex;align-items:center;gap:var(--spacing-xs);margin-top:var(--spacing-xs);font-size:.75rem;color:var(--text-light)}.status-icon{width:.875rem;height:.875rem;opacity:.7}.chat-input-container{padding:var(--spacing-lg);border-top:1px solid var(--border-light);background-color:var(--bg-primary)}.recipient-selector{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md);padding:var(--spacing-sm);background-color:var(--bg-secondary);border-radius:var(--radius-md);font-size:.875rem}.recipient-selector label{font-weight:500;color:var(--text-secondary)}.recipient-selector select{flex:1;padding:.5rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);background-color:var(--bg-primary)}.chat-input-form{display:flex;gap:var(--spacing-sm);align-items:flex-end}.chat-input{flex:1;padding:.75rem var(--spacing-md);border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:1rem;resize:none;min-height:50px;max-height:150px;font-family:inherit;transition:border-color var(--transition-fast)}.chat-input:focus{outline:none;border-color:var(--primary-color)}.send-button{padding:.75rem 1.5rem;min-width:100px}.text-center{text-align:center}.text-right{text-align:right}.text-muted{color:var(--text-secondary)}.text-small{font-size:.875rem}.text-xs{font-size:.75rem}.mt-0{margin-top:0}.mt-1{margin-top:var(--spacing-sm)}.mt-2{margin-top:var(--spacing-md)}.mt-3{margin-top:var(--spacing-lg)}.mt-4{margin-top:var(--spacing-xl)}.mb-0{margin-bottom:0}.mb-1{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-lg)}.mb-4{margin-bottom:var(--spacing-xl)}.flex{display:flex}.flex-column{flex-direction:column}.flex-wrap{flex-wrap:wrap}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-1{gap:var(--spacing-sm)}.gap-2{gap:var(--spacing-md)}.gap-3{gap:var(--spacing-lg)}.hidden{display:none!important}.alert{padding:var(--spacing-md);border-radius:var(--radius-md);margin-bottom:var(--spacing-md);display:flex;align-items:center;gap:var(--spacing-sm)}.alert-success{background-color:#d1fae5;color:#065f46;border:1px solid #10b981}.alert-error{background-color:#fee2e2;color:#991b1b;border:1px solid #ef4444}.alert-warning{background-color:#fef3c7;color:#92400e;border:1px solid #f59e0b}.alert-info{background-color:var(--primary-light);color:#1e3a8a;border:1px solid var(--primary-color)}.loading{display:inline-block;width:1rem;height:1rem;border:2px solid var(--border-color);border-top-color:var(--primary-color);border-radius:var(--radius-full);animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.spinner{width:3rem;height:3rem;border:4px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:var(--radius-full);animation:spin .8s linear infinite}.empty-state{text-align:center;padding:var(--spacing-2xl);color:var(--text-secondary)}.empty-state-icon{font-size:4rem;margin-bottom:var(--spacing-lg);opacity:.3}.empty-state h3{color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.empty-state p{margin-bottom:var(--spacing-lg)}.modal-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-lg)}.modal{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-width:500px;width:100%;max-height:90vh;overflow:auto}.modal-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-lg);border-top:1px solid var(--border-light);display:flex;gap:var(--spacing-sm);justify-content:flex-end}@media (max-width: 1024px){.chat-layout{grid-template-columns:250px 1fr}}@media (max-width: 768px){.chat-layout{grid-template-columns:1fr;height:calc(100vh - 120px)}.chat-sidebar{display:none}.rooms-grid{grid-template-columns:1fr}.header-content{padding:var(--spacing-sm) var(--spacing-md)}.auth-card{padding:var(--spacing-lg)}.chat-messages{padding:var(--spacing-md)}}@media (max-width: 480px){html{font-size:14px}.chat-input-form{flex-direction:column}.send-button{width:100%}}@media print{.app-header,.chat-sidebar,.chat-input-container,.btn{display:none}.chat-main{box-shadow:none}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb:hover{background:var(--text-light)}*:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}