:root{--bg:#080c16;--surface:#0f1623;--surface2:#1a2332;--surface3:#243044;--blue:#4f8cff;--blue2:#3b6fd4;--green:#34d399;--purple:#8b5cf6;--red:#ef4444;--amber:#f59e0b;--text:#f0f2f5;--text2:#94a3b8;--text3:#64748b;--border:#1e293b;--radius:12px;--sidebar-w:300px}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px;-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,input,textarea{border:none;background:none;color:inherit;font:inherit}input,textarea{outline:none}a{color:inherit;text-decoration:none}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-thumb{background:var(--surface3);border-radius:4px}.app-shell{height:100vh}.app-shell,.sidebar{display:flex;overflow:hidden}.sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--surface);border-right:1px solid var(--border);flex-direction:column;transition:transform .25s ease}.sidebar.hidden{transform:translateX(-100%)}.chat-area{flex:1 1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg)}.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:40}.sidebar-overlay.show{display:block}@media (max-width:640px){:root{--sidebar-w:85vw}.sidebar{position:fixed;top:0;left:0;height:100vh;z-index:50;transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}}.user-header{padding:14px 16px;border-bottom:1px solid var(--border);gap:10px}.avatar,.user-header{display:flex;align-items:center}.avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--purple));justify-content:center;font-weight:700;font-size:14px;color:#fff;flex-shrink:0;overflow:hidden}.avatar img{width:100%;height:100%;object-fit:cover}.user-info{flex:1 1;overflow:hidden}.user-name{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-role{font-size:11px;color:var(--text3)}.online-dot{width:9px;height:9px;border-radius:50%;background:var(--green);flex-shrink:0}.search-bar{margin:8px 10px;background:var(--surface2);border-radius:8px;display:flex;align-items:center;padding:0 12px;gap:8px}.search-bar input{flex:1 1;padding:9px 0;font-size:13px;color:var(--text)}.search-bar input::placeholder{color:var(--text3)}.convo-list{flex:1 1;overflow-y:auto;padding:4px 6px}.convo-item{display:flex;align-items:center;gap:10px;padding:10px;border-radius:10px;cursor:pointer;transition:background .15s;position:relative}.convo-item.active,.convo-item:hover{background:var(--surface2)}.convo-name{font-weight:600;font-size:13px}.convo-name,.convo-preview{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.convo-preview{font-size:11.5px;color:var(--text3);margin-top:2px}.convo-meta{display:flex;flex-direction:column;align-items:flex-end;gap:3px;flex-shrink:0}.convo-time{font-size:10px;color:var(--text3)}.unread-badge{background:var(--green);color:#fff;font-size:10px;font-weight:700;border-radius:10px;padding:1px 6px;min-width:18px;text-align:center}.chat-header{height:60px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:14px;flex-shrink:0}.chat-header-info{flex:1 1}.chat-title{font-weight:700;font-size:15px}.chat-subtitle{font-size:11px;color:var(--text3);margin-top:1px}.hamburger{display:none;padding:8px;border-radius:8px;font-size:18px;color:var(--text2)}@media (max-width:640px){.hamburger{display:flex;align-items:center}}.messages-wrap{flex:1 1;overflow-y:auto;padding:16px 20px;gap:4px}.messages-wrap,.msg-row{display:flex;flex-direction:column}.msg-row.mine{align-items:flex-end}.msg-row.theirs{align-items:flex-start}.msg-sender{font-size:11px;font-weight:600;color:var(--blue);margin-bottom:2px;padding-left:4px}.bubble{max-width:min(420px,80vw);padding:10px 14px;border-radius:14px;font-size:13.5px;line-height:1.5;word-break:break-word;white-space:pre-wrap}.bubble.mine{background:linear-gradient(135deg,var(--blue2),var(--blue));color:#fff;border-bottom-right-radius:4px}.bubble.theirs{background:var(--surface);color:var(--text);border-bottom-left-radius:4px;border:1px solid var(--border)}.bubble.deleted{color:var(--text3);font-style:italic;font-size:12px;background:var(--surface2);border:none}.msg-meta{font-size:10px;color:rgba(255,255,255,.6);text-align:right;margin-top:3px}.msg-meta.theirs{color:var(--text3)}.msg-image{max-width:min(280px,75vw);border-radius:10px;cursor:pointer}.typing-indicator{padding:4px 0 8px 4px;font-size:12px;font-style:italic;color:var(--green);min-height:20px}.chat-search{background:var(--surface2);border-bottom:1px solid var(--border);padding:8px 20px;display:flex;align-items:center;gap:10px}.chat-search input{flex:1 1;padding:7px 12px;background:var(--surface3);border-radius:8px;font-size:13px}.chat-search-count{font-size:11px;color:var(--text3);white-space:nowrap}.input-bar{background:var(--surface);border-top:1px solid var(--border);padding:10px 16px;gap:8px;flex-shrink:0}.input-bar,.input-wrap{display:flex;align-items:center}.input-wrap{flex:1 1;background:var(--surface2);border-radius:22px;padding:0 16px}.input-wrap textarea{flex:1 1;resize:none;max-height:120px;padding:11px 0;font-size:13.5px;line-height:1.4}.input-wrap textarea::placeholder{color:var(--text3)}.icon-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;transition:background .15s;flex-shrink:0}.icon-btn:hover{background:var(--surface2)}.send-btn{width:40px;height:40px;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:opacity .15s}.send-btn:hover{opacity:.85}.send-btn svg{width:18px;height:18px;fill:#fff}.emoji-picker{position:absolute;bottom:70px;right:10px;width:min(360px,95vw);background:var(--surface);border:1px solid var(--border);border-radius:14px;z-index:100;overflow:hidden;box-shadow:0 8px 32px rgba(0,0,0,.4)}.emoji-cats{display:flex;overflow-x:auto;padding:8px;gap:2px;border-bottom:1px solid var(--border)}.emoji-cat-btn{padding:6px 8px;border-radius:8px;font-size:18px;transition:background .15s}.emoji-cat-btn.active,.emoji-cat-btn:hover{background:var(--surface2)}.emoji-grid{display:grid;grid-template-columns:repeat(8,1fr);grid-gap:2px;gap:2px;padding:8px;max-height:200px;overflow-y:auto}.emoji-btn{font-size:22px;padding:4px;border-radius:6px;text-align:center;transition:background .15s}.emoji-btn:hover{background:var(--surface2)}.empty-state{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text3);gap:12px;text-align:center;padding:20px}.empty-state .big-icon{font-size:56px}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:20px}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:36px 32px;width:100%;max-width:400px}.login-logo{gap:10px;margin-bottom:20px}.login-logo,.logo-circle{display:flex;align-items:center}.logo-circle{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--purple));justify-content:center;font-weight:700;font-size:16px;color:#fff}.login-title{font-size:20px;font-weight:700}.login-sub{margin-top:4px;margin-bottom:24px}.form-label,.login-sub{font-size:12px;color:var(--text2)}.form-label{margin-bottom:5px}.form-input{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:11px 13px;font-size:13px;color:var(--text);margin-bottom:14px;display:block;outline:none;transition:border-color .15s}.form-input:focus{border-color:var(--blue)}.login-btn{width:100%;background:var(--blue);color:#fff;border-radius:8px;padding:12px;font-size:14px;font-weight:600;transition:opacity .15s}.login-btn:hover{opacity:.88}.login-btn:disabled{opacity:.5}.login-err{color:var(--red);font-size:12px;margin-bottom:10px}.login-footer{font-size:10px;color:var(--text3);text-align:center;margin-top:14px}.toast{position:fixed;top:16px;right:16px;background:var(--surface3);border:1px solid var(--border);border-radius:10px;padding:12px 16px;max-width:320px;z-index:200;animation:slideIn .2s ease;cursor:pointer}@keyframes slideIn{0%{transform:translateX(120%);opacity:0}to{transform:translateX(0);opacity:1}}.toast-title{font-weight:600;font-size:13px}.toast-body{font-size:12px;color:var(--text2);margin-top:2px}.reconnect-bar{background:var(--amber);color:#fff;text-align:center;font-size:12px;font-weight:600;padding:5px}.file-bubble{display:flex;align-items:center;gap:10px}.file-icon{font-size:24px}.file-info .file-name{font-weight:600;font-size:12.5px}.file-info .file-size{font-size:11px;opacity:.75;margin-top:1px}