:root{--bg: #0f0f14;--bg-elevated: #18181f;--bg-hover: #22222c;--border: #2a2a36;--text: #f4f4f6;--text-muted: #9b9bab;--accent: #7c5cff;--accent-hover: #9278ff;--accent-dim: rgba(124, 92, 255, .15);--danger: #ff6b7a;--success: #4ade80;--radius: 12px;--radius-sm: 8px;--shadow: 0 8px 32px rgba(0, 0, 0, .4);--font: "DM Sans", system-ui, sans-serif;--sidebar-w: 280px;--headbar-h: 64px;--mobile-nav-h: 56px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}button,input{font:inherit;color:inherit}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.65rem 1.25rem;border:none;border-radius:var(--radius-sm);cursor:pointer;font-weight:600;transition:background .15s,transform .1s}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-secondary{background:var(--bg-hover);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--border)}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-ghost:hover{color:var(--text)}.btn-icon{background:transparent;border:none;font-size:1.25rem;padding:.5rem;cursor:pointer}.btn-block{width:100%}.btn-sm{padding:.4rem .75rem;font-size:.875rem}.btn-xs{padding:.25rem .5rem;font-size:.75rem}.btn-icon-text{background:none;border:none;cursor:pointer;opacity:.6;font-size:.85rem;padding:.15rem}.btn-icon-text:hover{opacity:1}.loader-wrap{display:flex;flex-direction:column;align-items:center;gap:1rem;color:var(--text-muted)}.loader-full{min-height:100vh;justify-content:center}.loader{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1.5rem;position:relative;overflow:hidden}.auth-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 80% 50% at 50% -20%,var(--accent-dim),transparent),radial-gradient(ellipse 60% 40% at 100% 100%,rgba(124,92,255,.08),transparent);pointer-events:none}.auth-card{position:relative;width:100%;max-width:400px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:calc(var(--radius) + 4px);padding:2rem;box-shadow:var(--shadow)}.auth-brand{text-align:center;margin-bottom:1.5rem}.auth-brand h1{font-size:1.75rem;margin-top:.5rem}.brand-icon{display:inline-flex;width:48px;height:48px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--accent),#a78bfa);border-radius:14px;font-weight:700;font-size:1.5rem}.brand-icon.sm{width:32px;height:32px;font-size:1rem;border-radius:10px}.brand-tag{color:var(--text-muted);font-size:.875rem}.auth-card h2{font-size:1.25rem;margin-bottom:.25rem}.auth-sub{color:var(--text-muted);font-size:.9rem;margin-bottom:1.25rem}.auth-form{display:flex;flex-direction:column;gap:1rem}.auth-form label{display:flex;flex-direction:column;gap:.35rem;font-size:.875rem;font-weight:500;color:var(--text-muted)}.auth-form input[type=text],.auth-form input[type=password]{padding:.75rem 1rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text)}.auth-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}.checkbox-row{flex-direction:row!important;align-items:center;gap:.5rem!important;cursor:pointer}.checkbox-row input{width:auto;accent-color:var(--accent)}.form-error{color:var(--danger);font-size:.875rem}.form-error.sm{font-size:.75rem}.auth-footer{text-align:center;margin-top:1.5rem;font-size:.9rem;color:var(--text-muted)}.pin-hint{font-size:.85rem;color:var(--text-muted);margin-bottom:1rem;padding:.65rem .75rem;background:var(--accent-dim);border-radius:var(--radius-sm);border-left:3px solid var(--accent)}.link-btn{background:none;border:none;color:var(--accent);cursor:pointer;font:inherit;text-decoration:underline}.app-shell{display:flex;height:100%;max-height:100dvh;overflow:hidden}.sidebar-wrap{width:var(--sidebar-w);flex-shrink:0;border-right:1px solid var(--border);background:var(--bg-elevated);display:flex;flex-direction:column;z-index:100}.sidebar{display:flex;flex-direction:column;height:100%;padding:1rem;gap:.75rem;overflow-y:auto}.sidebar-header{display:flex;align-items:center;justify-content:space-between}.sidebar-brand{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.1rem}.create-group-form{display:flex;flex-direction:column;gap:.5rem;padding:.75rem;background:var(--bg);border-radius:var(--radius-sm);border:1px solid var(--border)}.create-group-form input{padding:.5rem .75rem;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm)}.icon-picker{display:flex;flex-wrap:wrap;gap:.25rem}.icon-picker button{background:var(--bg-elevated);border:1px solid transparent;border-radius:6px;padding:.25rem .4rem;cursor:pointer;font-size:1.1rem}.icon-picker button.active{border-color:var(--accent);background:var(--accent-dim)}.sidebar-section h3{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin:.5rem 0}.group-list{list-style:none}.group-item{width:100%;display:flex;align-items:center;gap:.6rem;padding:.65rem .75rem;border:none;background:transparent;border-radius:var(--radius-sm);cursor:pointer;text-align:left;transition:background .15s}.group-item:hover{background:var(--bg-hover)}.group-item.active{background:var(--accent-dim);color:var(--accent-hover)}.group-icon{font-size:1.25rem}.group-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}.group-count{font-size:.75rem;color:var(--text-muted);background:var(--bg);padding:.15rem .4rem;border-radius:99px}.empty-hint{padding:1rem;color:var(--text-muted);font-size:.875rem}.main-panel{flex:1;display:flex;flex-direction:column;min-width:0;position:relative}.headbar{min-height:var(--headbar-h);padding:.75rem 1rem;border-bottom:1px solid var(--border);background:var(--bg-elevated);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;position:relative;z-index:10}.headbar-empty{justify-content:space-between}.headbar-left{display:flex;align-items:center;gap:.75rem;min-width:0}.headbar-icon{font-size:1.75rem}.headbar h2{font-size:1.1rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.headbar-desc{font-size:.8rem;color:var(--text-muted)}.headbar-actions{display:flex;flex-wrap:wrap;gap:.5rem}.dropdown-panel{position:absolute;top:100%;right:1rem;margin-top:.25rem;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;min-width:260px;max-width:calc(100vw - 2rem);max-height:280px;overflow-y:auto;box-shadow:var(--shadow);z-index:50}.dropdown-panel h4{font-size:.8rem;color:var(--text-muted);margin-bottom:.75rem}.dropdown-panel ul{list-style:none;display:flex;flex-direction:column;gap:.5rem}.dropdown-panel li{display:flex;align-items:center;gap:.5rem;font-size:.9rem}.avatar{width:28px;height:28px;border-radius:50%;background:var(--accent-dim);color:var(--accent-hover);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;flex-shrink:0}.badge{font-size:.65rem;background:var(--accent-dim);color:var(--accent);padding:.1rem .35rem;border-radius:4px;margin-left:auto}.add-panel li{justify-content:space-between}.panel-hint{font-size:.8rem;margin-bottom:.75rem;line-height:1.4}.chat-area{flex:1;display:flex;flex-direction:column;min-height:0;background:var(--bg)}.chat-empty{align-items:center;justify-content:center}.empty-state{text-align:center;padding:2rem;color:var(--text-muted)}.empty-state span{font-size:3rem;display:block;margin-bottom:1rem}.empty-state h3{color:var(--text);margin-bottom:.5rem}.pinned-bar{padding:.5rem 1rem;background:var(--accent-dim);border-bottom:1px solid var(--border);font-size:.85rem}.pin-label{display:block;font-weight:600;margin-bottom:.35rem;color:var(--accent-hover)}.pinned-item{display:flex;align-items:flex-start;justify-content:space-between;gap:.5rem;padding:.35rem 0;opacity:.9}.pinned-item-text{flex:1;min-width:0}.pinned-unpin{flex-shrink:0;opacity:.7;font-size:.9rem;padding:.2rem .4rem}.pinned-unpin:hover{opacity:1;color:var(--danger)}.messages-scroll{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.75rem}.message{display:flex;gap:.5rem;max-width:85%}.message.mine{align-self:flex-end;flex-direction:row-reverse}.msg-avatar{width:32px;height:32px;border-radius:50%;background:var(--bg-hover);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:600;flex-shrink:0;align-self:flex-end}.message-bubble{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:.6rem .85rem}.message.mine .message-bubble{background:var(--accent-dim);border-color:#7c5cff4d}.msg-author{display:block;font-size:.75rem;font-weight:600;color:var(--accent-hover);margin-bottom:.2rem}.message-bubble p{word-break:break-word}.message-meta{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-top:.35rem}.message-meta time{font-size:.7rem;color:var(--text-muted)}.msg-actions{display:flex;gap:.25rem}.composer{display:flex;gap:.5rem;padding:.75rem 1rem;border-top:1px solid var(--border);background:var(--bg-elevated);padding-bottom:max(.75rem,env(safe-area-inset-bottom))}.composer input{flex:1;padding:.75rem 1rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm)}.composer input:focus{outline:none;border-color:var(--accent)}.typing-indicator{display:flex;align-items:center;gap:.5rem;padding:.25rem 1rem .4rem;font-size:.78rem;color:var(--text-muted);min-height:1.5rem;background:var(--bg-elevated)}.typing-dots{display:inline-flex;gap:3px;align-items:center}.typing-dots span{width:5px;height:5px;border-radius:50%;background:var(--text-muted);animation:typing-bounce 1.2s infinite ease-in-out}.typing-dots span:nth-child(2){animation-delay:.2s}.typing-dots span:nth-child(3){animation-delay:.4s}@keyframes typing-bounce{0%,80%,to{transform:translateY(0);opacity:.4}40%{transform:translateY(-4px);opacity:1}}.muted{color:var(--text-muted)}.muted.center{text-align:center;padding:2rem}.mobile-only{display:none!important}.desktop-only{display:inline-flex!important}.sidebar-overlay,.mobile-nav{display:none}@media (max-width: 768px){.mobile-only{display:inline-flex!important}.desktop-only{display:none!important}.sidebar-wrap{position:fixed;left:0;top:0;bottom:0;transform:translate(-100%);transition:transform .25s ease;box-shadow:var(--shadow)}.sidebar-wrap.open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;opacity:0;pointer-events:none;transition:opacity .25s;z-index:90}.sidebar-overlay.open{opacity:1;pointer-events:auto}.main-panel{padding-bottom:var(--mobile-nav-h)}.message{max-width:92%}.headbar-actions .btn-secondary{padding:.35rem .5rem;font-size:.8rem}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;height:var(--mobile-nav-h);background:var(--bg-elevated);border-top:1px solid var(--border);z-index:80;padding-bottom:env(safe-area-inset-bottom)}.mobile-nav button{flex:1;background:none;border:none;color:var(--text-muted);font-weight:600;cursor:pointer}.mobile-nav button:first-child{color:var(--accent)}.dropdown-panel{left:1rem;right:1rem}}@media (max-width: 480px){.auth-card{padding:1.5rem}.composer .btn{padding:.65rem .85rem}}