:root{--bg-app:#f8fafc;--bg-card:#fff;--bg-sidebar:#f1f5f9;--border-color:#e2e8f0;--text-main:#0f172a;--text-muted:#64748b;--primary-color:#2563eb;--primary-hover:#1d4ed8;--danger-color:#ef4444;--success-color:#10b981;--font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}[data-theme=dark]{--bg-app:#0f172a;--bg-card:#1e293b;--bg-sidebar:#1a2235;--border-color:#334155;--text-main:#f1f5f9;--text-muted:#94a3b8;--primary-color:#3b82f6;--primary-hover:#2563eb;--danger-color:#f87171;--success-color:#34d399}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-app);color:var(--text-main);-webkit-font-smoothing:antialiased;line-height:1.5;transition:background-color .25s,color .25s}.init-screen{height:100vh;color:var(--text-muted);justify-content:center;align-items:center;font-size:1.1rem;display:flex}.auth-container{background:var(--bg-sidebar);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.auth-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;width:100%;max-width:400px;padding:32px;box-shadow:0 4px 6px -1px #0000000d}.auth-header{text-align:center;margin-bottom:24px}.auth-header h2{color:var(--text-main);font-size:1.5rem;font-weight:600}.auth-header p{color:var(--text-muted);font-size:.875rem}.auth-tabs{border-bottom:2px solid var(--border-color);margin-bottom:20px;display:flex}.tab-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;flex:1;margin-bottom:-2px;padding:10px;font-size:.95rem;font-weight:500}.tab-btn.active{color:var(--primary-color);border-bottom-color:var(--primary-color)}.auth-form .form-group{margin-bottom:16px}.form-group label{color:var(--text-main);margin-bottom:6px;font-size:.85rem;font-weight:500;display:block}.input-field{border:1px solid var(--border-color);background:var(--bg-card);width:100%;color:var(--text-main);border-radius:6px;outline:none;padding:10px 12px;font-family:inherit;font-size:.95rem;transition:border-color .15s,background-color .25s}.input-field:focus{border-color:var(--primary-color)}.btn{cursor:pointer;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;gap:6px;padding:8px 14px;font-size:.9rem;font-weight:500;transition:all .15s;display:inline-flex}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{background:var(--border-color);color:var(--text-main)}.btn-secondary:hover{background:var(--text-muted);color:var(--bg-card)}.btn-outline{border-color:var(--border-color);color:var(--text-main);background:0 0}.btn-outline:hover{background:var(--bg-sidebar)}.btn-danger{background:var(--danger-color);color:#fff}.btn-success{background:var(--success-color);color:#fff}.btn-full{width:100%}.btn-sm{padding:6px 12px;font-size:.85rem}.btn-xs{padding:4px 8px;font-size:.75rem}.alert{border-radius:6px;margin-bottom:16px;padding:10px 12px;font-size:.85rem}.alert-error{color:#991b1b;background:#fee2e2;border:1px solid #fecaca}[data-theme=dark] .alert-error{color:#fca5a5;background:#451a1a;border-color:#7f1d1d}.alert-success{color:#065f46;background:#d1fae5;border:1px solid #a7f3d0}[data-theme=dark] .alert-success{color:#6ee7b7;background:#064e3b;border-color:#047857}.modal-backdrop{z-index:100;background:#0f172a66;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-card{background:var(--bg-card);border-radius:8px;width:90%;max-width:440px;padding:24px;box-shadow:0 10px 15px -3px #0000001a}.modal-card h3{margin-bottom:8px;font-size:1.2rem}.modal-sub{color:var(--text-muted);margin-bottom:16px;font-size:.875rem}.modal-actions{justify-content:flex-end;gap:10px;margin-top:20px;display:flex}.app-layout{flex-direction:column;height:100vh;display:flex;overflow:hidden}.app-header{background:var(--bg-card);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;height:60px;padding:12px 24px;display:flex}.header-brand h1{font-size:1.2rem;font-weight:600}.header-actions{align-items:center;gap:12px;display:flex}.user-badge{background:var(--bg-sidebar);color:var(--text-main);border-radius:20px;padding:4px 10px;font-size:.9rem;font-weight:600}.app-main-body{flex:1;display:flex;overflow:hidden}.chat-sidebar{background:var(--bg-sidebar);border-right:1px solid var(--border-color);flex-direction:column;width:320px;display:flex}.sidebar-tabs{border-bottom:1px solid var(--border-color);background:var(--bg-card);display:flex}.sidebar-tab{color:var(--text-muted);cursor:pointer;background:0 0;border:none;flex:1;justify-content:center;align-items:center;gap:6px;padding:12px;font-size:.85rem;font-weight:500;display:flex}.sidebar-tab.active{color:var(--primary-color);border-bottom:2px solid var(--primary-color)}.search-bar{border-bottom:1px solid var(--border-color);padding:10px;position:relative}.search-icon{color:var(--text-muted);position:absolute;top:50%;left:20px;transform:translateY(-50%)}.search-input{border:1px solid var(--border-color);border-radius:20px;outline:none;width:100%;padding:8px 12px 8px 32px;font-size:.85rem}.sidebar-list{flex:1;overflow-y:auto}.sidebar-item{border-bottom:1px solid var(--border-color);cursor:pointer;align-items:center;gap:12px;padding:12px;transition:background .1s;display:flex}.sidebar-item:hover{background:var(--border-color)}.sidebar-item.selected{background:var(--bg-card);border-left:3px solid var(--primary-color)}.avatar{background:var(--border-color);width:40px;height:40px;color:var(--text-main);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.9rem;font-weight:600;display:flex}.avatar-sm{width:34px;height:34px;font-size:.8rem}.item-details{flex:1;min-width:0}.item-header{justify-content:space-between;align-items:center;display:flex}.item-title{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;font-size:.9rem;font-weight:600;overflow:hidden}.item-preview,.item-sub{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:.8rem;overflow:hidden}.empty-sidebar{text-align:center;color:var(--text-muted);padding:24px;font-size:.85rem}.chat-main{background:var(--bg-app);flex-direction:column;flex:1;display:flex}.empty-thread{background:var(--bg-app);justify-content:center;align-items:center}.empty-thread-content{text-align:center;max-width:360px;color:var(--text-muted)}.empty-icon{color:#94a3b8;margin-bottom:12px}.thread-header{border-bottom:1px solid var(--border-color);background:var(--bg-card);align-items:center;gap:12px;height:60px;padding:12px 20px;display:flex}.thread-user-info h3{font-size:1rem;font-weight:600}.thread-sub{color:var(--text-muted);font-size:.75rem}.thread-messages{background:#f8fafc;flex-direction:column;flex:1;gap:10px;padding:20px;display:flex;overflow-y:auto}.empty-messages{text-align:center;color:var(--text-muted);margin:auto;font-size:.9rem}.message-bubble-wrapper{width:100%;display:flex}.message-bubble-wrapper.outgoing{justify-content:flex-end}.message-bubble-wrapper.incoming{justify-content:flex-start}.message-bubble{word-break:break-word;border-radius:12px;max-width:65%;padding:10px 14px;font-size:.9rem;position:relative}.outgoing .message-bubble{background:var(--primary-color);color:#fff;border-bottom-right-radius:2px}.incoming .message-bubble{background:var(--bg-card);color:var(--text-main);border:1px solid var(--border-color);border-bottom-left-radius:2px}.message-time{text-align:right;opacity:.8;margin-top:4px;font-size:.7rem}.message-input-form{border-top:1px solid var(--border-color);background:var(--bg-card);gap:10px;padding:12px 20px;display:flex}.message-text-input{border:1px solid var(--border-color);border-radius:20px;outline:none;flex:1;padding:10px 14px;font-size:.9rem}.send-btn{border-radius:50%;width:40px;height:40px;padding:0}.drawer-overlay{z-index:90;background:#0f172a4d;justify-content:flex-end;display:flex;position:fixed;inset:0}.drawer-panel{background:var(--bg-card);flex-direction:column;width:380px;height:100%;animation:.25s ease-out forwards slideIn;display:flex;box-shadow:-4px 0 15px #0000001a}@keyframes slideIn{0%{transform:translate(100%)}to{transform:translate(0)}}.drawer-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:16px;display:flex}.drawer-body{flex:1;padding:16px;overflow-y:auto}.drawer-section{margin-bottom:24px}.drawer-section h4{color:var(--text-main);align-items:center;gap:6px;margin-bottom:12px;font-size:.9rem;font-weight:600;display:flex}.input-group-append{gap:8px;margin-top:8px;display:flex}.request-list{list-style:none}.request-item{border:1px solid var(--border-color);border-radius:6px;flex-direction:column;gap:8px;margin-bottom:8px;padding:10px;display:flex}.req-info{justify-content:space-between;align-items:center;display:flex}.req-user{font-size:.85rem;font-weight:600}.req-actions{gap:6px;display:flex}.badge{border-radius:4px;padding:2px 6px;font-size:.7rem;font-weight:500}.badge-pending{color:#92400e;background:#fef3c7}.empty-text{color:var(--text-muted);font-size:.8rem}.icon-btn{cursor:pointer;color:var(--text-muted);background:0 0;border:none}.theme-toggle-btn{width:34px;height:34px;color:var(--text-main);border-radius:8px;justify-content:center;align-items:center;transition:background-color .15s,color .15s;display:flex}.theme-toggle-btn:hover{background:var(--bg-sidebar);color:var(--primary-color)}