:root{--bg:#0f1115;--panel:#171a21;--panel-2:#1e222b;--border:#2a2f3a;--text:#e8eaf0;--text-dim:#9aa1b1;--accent:#5b8cff;--accent-dim:#33456e;--online:#34d399;--offline:#6b7280;--danger:#f87171;--radius:10px}*{box-sizing:border-box}html,body,#root{background:var(--bg);height:100%;color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.screen{width:100vw;height:100vh}.setup-screen{justify-content:center;align-items:center;padding:24px;display:flex;overflow-y:auto}.setup-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:560px;padding:32px}.setup-card h1{margin:0 0 8px;font-size:28px}.tagline{color:var(--text-dim);margin:0 0 24px;font-size:14px;line-height:1.4}.field{margin-bottom:20px;display:block}.field span{color:var(--text-dim);margin-bottom:6px;font-size:13px;display:block}input[type=text]{background:var(--panel-2);border:1px solid var(--border);width:100%;color:var(--text);border-radius:8px;padding:10px 12px;font-size:14px}input[type=text]:focus{border-color:var(--accent);outline:none}.choice-actions{grid-template-columns:1fr 1fr;gap:16px;margin-top:28px;display:grid}@media (width<=520px){.choice-actions{grid-template-columns:1fr}}.choice-btn{justify-content:center;align-items:center;padding:20px 14px;font-size:15px;font-weight:600;text-decoration:none;display:flex}.back-link{color:var(--text-dim);margin-bottom:16px;font-size:13px;text-decoration:none;display:inline-block}.back-link:hover{color:var(--text)}.btn{border:1px solid var(--border);background:var(--panel);width:100%;color:var(--text);cursor:pointer;border-radius:8px;padding:10px 14px;font-size:14px}.btn:hover{border-color:var(--accent)}.btn:disabled{opacity:.6;cursor:default}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{filter:brightness(1.08)}.btn.small{width:auto;padding:6px 12px;font-size:13px}.recent-rooms{margin-top:24px}.recent-rooms h3{color:var(--text-dim);margin:0 0 10px;font-size:13px}.recent-rooms-list{flex-wrap:wrap;gap:8px;display:flex}.recent-room-chip{background:var(--panel-2);border:1px solid var(--border);cursor:pointer;color:var(--text);border-radius:999px;padding:6px 12px;font-size:13px}.recent-room-chip:hover{border-color:var(--accent)}.error{color:var(--danger);margin-top:16px;margin-bottom:0;font-size:13px}.chat-screen{display:flex}.sidebar{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;width:260px;min-width:260px;display:flex}.sidebar-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px;display:flex}.room-label{color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;font-size:11px}.room-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:16px;font-weight:600}.thread-list{flex:1;padding:8px;overflow-y:auto}.thread-item{width:100%;color:var(--text);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:8px;align-items:center;gap:10px;padding:10px 12px;font-size:14px;display:flex}.thread-item:hover{background:var(--panel-2)}.thread-item.active{background:var(--accent-dim)}.thread-icon{text-align:center;width:20px;font-size:16px}.thread-name{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.unread-badge{background:var(--accent);color:#fff;border-radius:999px;justify-content:center;align-items:center;min-width:18px;height:18px;padding:0 5px;font-size:11px;font-weight:600;display:inline-flex}.thread-section-label{color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em;padding:16px 12px 6px;font-size:11px}.dot{border-radius:50%;flex-shrink:0;width:8px;height:8px;display:inline-block}.dot.online{background:var(--online)}.dot.offline{background:var(--offline)}.sidebar-footer{border-top:1px solid var(--border);color:var(--text-dim);justify-content:space-between;align-items:center;padding:14px 16px;font-size:13px;display:flex}.chat-main{flex-direction:column;flex:1;min-width:0;display:flex}.chat-header{border-bottom:1px solid var(--border);align-items:baseline;gap:10px;padding:16px 20px;display:flex}.chat-header #current-thread-title{font-size:15px;font-weight:600}.thread-status{color:var(--text-dim);font-size:12px}.messages{flex-direction:column;flex:1;gap:10px;padding:20px;display:flex;overflow-y:auto}.msg{background:var(--panel-2);border-radius:12px;align-self:flex-start;max-width:70%;padding:8px 12px}.msg.self{background:var(--accent-dim);align-self:flex-end}.msg-meta{color:var(--text-dim);gap:8px;margin-bottom:3px;font-size:11px;display:flex}.msg-text{white-space:pre-wrap;word-break:break-word;font-size:14px;line-height:1.4}.empty-hint{color:var(--text-dim);text-align:center;margin-top:40px;font-size:13px}.send-form{border-top:1px solid var(--border);gap:10px;padding:16px 20px;display:flex}.send-form input{flex:1}.send-form .btn{width:auto;padding:10px 20px}