:root{--brand:#2563eb;--bg:#f6f7f9;--panel:#fff;--border:#e6e8eb;--muted:#6b7280;--text:#111827;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.muted{color:var(--muted)}.app-shell{grid-template-columns:220px 1fr;height:100vh;display:grid}.sidebar{color:#e2e8f0;background:#0f172a;flex-direction:column;padding:16px;display:flex}.sidebar .brand{margin-bottom:20px;font-size:18px;font-weight:700}.sidebar nav{flex-direction:column;gap:4px;display:flex}.nav-link{color:#cbd5e1;border-radius:8px;padding:8px 10px;font-size:14px;text-decoration:none}.nav-link:hover{color:#fff;background:#ffffff14}.sidebar-footer{flex-direction:column;gap:6px;margin-top:auto;font-size:13px;display:flex}.link-button{color:#93c5fd;cursor:pointer;text-align:left;background:0 0;border:0;padding:0}.content{overflow:hidden}.inbox{grid-template-columns:300px 1fr 280px;height:100vh;display:grid}.inbox-list,.inbox-visitor{border-right:1px solid var(--border);background:var(--panel);overflow-y:auto}.inbox-visitor{border-right:0;border-left:1px solid var(--border);padding:16px}.inbox-filters{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:4px;padding:10px;display:flex}.inbox-filters button{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:999px;padding:3px 10px;font-size:12px}.inbox-filters button.active{background:var(--brand);color:#fff;border-color:var(--brand)}.inbox-list ul{margin:0;padding:0;list-style:none}.inbox-list li{border-bottom:1px solid var(--border);cursor:pointer;padding:12px 14px}.inbox-list li.selected{background:#eff6ff}.inbox-list .row{justify-content:space-between;align-items:center;display:flex}.badge{background:var(--brand);color:#fff;border-radius:999px;padding:1px 7px;font-size:11px}.inbox-thread{background:var(--bg);flex-direction:column;display:flex}.messages{flex-direction:column;flex:1;gap:8px;padding:16px;display:flex;overflow-y:auto}.message{flex-direction:column;max-width:70%;display:flex}.message.visitor{align-self:flex-start}.message.user,.message.system{align-self:flex-end;align-items:flex-end}.bubble{border:1px solid var(--border);background:#fff;border-radius:12px;padding:8px 12px}.message.user .bubble{background:var(--brand);color:#fff;border-color:var(--brand)}.composer{border-top:1px solid var(--border);background:#fff;gap:8px;padding:12px;display:flex}.composer textarea{resize:none;border:1px solid var(--border);font:inherit;border-radius:8px;flex:1;padding:8px}.composer button,.auth-card button{background:var(--brand);color:#fff;cursor:pointer;border:0;border-radius:8px;padding:8px 16px}.empty{color:var(--muted);padding:16px}.empty.centered{margin:auto}.inbox-visitor dl{grid-template-columns:1fr;gap:2px;display:grid}.inbox-visitor dt{color:var(--muted);margin-top:8px;font-size:12px}.inbox-visitor pre{white-space:pre-wrap;word-break:break-word;background:#f8fafc;border-radius:8px;padding:8px;font-size:12px}.auth-screen{justify-content:center;align-items:center;height:100vh;display:flex}.auth-card{border:1px solid var(--border);background:#fff;border-radius:14px;flex-direction:column;gap:10px;width:320px;padding:28px;display:flex}.auth-card h1{margin:0}.auth-card label{flex-direction:column;gap:4px;font-size:13px;display:flex}.auth-card label.checkbox{flex-direction:row;align-items:center;gap:8px}.auth-card input{border:1px solid var(--border);font:inherit;border-radius:8px;padding:8px}.field-error{color:#dc2626;font-size:12px}.placeholder{padding:40px}