:root{color:#111827;font-synthesis:none;text-rendering:optimizelegibility;background:#f8fafc;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,input,textarea{font:inherit}button{cursor:pointer}.loading,.login-screen{place-items:center;min-height:100vh;padding:24px;display:grid}.login-screen{background:linear-gradient(140deg,#0f172a 0%,#172554 52%,#f8fafc 52%)}.login-panel{background:#fffffff5;border:1px solid #e5e7eb;border-radius:8px;width:min(440px,100%);padding:28px;box-shadow:0 24px 60px #0f172a38}.eyebrow{color:#0284c7;letter-spacing:0;text-transform:uppercase;margin:0 0 8px;font-size:12px;font-weight:800}h1,h2,p{margin-top:0}.muted{color:#64748b}.login-form{gap:16px;margin-top:28px;display:grid}label{color:#334155;gap:7px;font-size:14px;font-weight:700;display:grid}input,textarea{border:1px solid #cbd5e1;border-radius:8px;padding:12px 14px}.login-form button,.icon-text,.send-button{color:#fff;background:#111827;border:0;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:44px;padding:0 16px;font-weight:800;display:inline-flex}.error{color:#dc2626;margin:0}.app-shell{grid-template-columns:280px 1fr;height:100vh;display:grid;overflow:hidden}.sidebar{color:#fff;background:#0f172a;flex-direction:column;gap:18px;padding:20px;display:flex}.brand{align-items:center;gap:12px;display:flex}.logo{color:#082f49;background:#38bdf8;border-radius:8px;justify-content:center;align-items:center;width:42px;height:42px;font-weight:900;display:inline-flex}.brand small{color:#94a3b8;display:block}nav{gap:8px;display:grid;overflow:auto}.conversation,.ghost{color:#cbd5e1;text-align:left;background:0 0;border:1px solid #ffffff1f;border-radius:8px;min-height:42px;padding:0 12px}.conversation.active{color:#fff;background:#38bdf829;border-color:#38bdf880}.ghost{margin-top:auto}.chat-panel{grid-template-rows:auto 1fr auto auto;min-width:0;display:grid}.chat-header{border-bottom:1px solid #e2e8f0;justify-content:space-between;align-items:center;padding:18px clamp(16px,4vw,36px);display:flex}.chat-header h1{margin:0;font-size:24px}.status-dot{color:#075985;background:#e0f2fe;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:800}.messages{flex-direction:column;gap:14px;padding:22px clamp(16px,4vw,36px);display:flex;overflow-y:auto}.empty-state{color:#64748b;text-align:center;align-self:center;max-width:420px;padding-top:18vh}.empty-state h2{color:#111827}.message{border-radius:8px;max-width:min(720px,92%);padding:12px 14px}.message.user{color:#fff;background:#111827;align-self:flex-end}.message.arthur{background:#fff;border:1px solid #e2e8f0;align-self:flex-start}.message-meta{opacity:.7;margin-bottom:6px;font-size:12px;font-weight:900}.message p{white-space:pre-wrap;margin-bottom:0}.attachment-list,.pending-uploads{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.attachment-list span,.pending-uploads span{color:#334155;background:#e2e8f0;border-radius:999px;padding:6px 9px;font-size:12px;font-weight:700}.pending-uploads{border-top:1px solid #e2e8f0;margin:0;padding:10px clamp(16px,4vw,36px)}.composer{padding:12px clamp(16px, 4vw, 36px) calc(12px + env(safe-area-inset-bottom));border-top:1px solid #e2e8f0;grid-template-columns:44px 44px 1fr 48px;align-items:end;gap:10px;display:grid}.tool-button{color:#111827;background:#fff;border:1px solid #cbd5e1;border-radius:8px;justify-content:center;align-items:center;width:44px;height:44px;display:inline-flex}.tool-button input{display:none}.tool-button.recording{color:#b91c1c;background:#fee2e2;border-color:#ef4444}textarea{resize:vertical;min-height:44px;max-height:140px}.send-button{width:48px;height:44px;padding:0}@media (width<=760px){.app-shell{grid-template-columns:1fr}.sidebar{border-bottom:1px solid #1e293b;grid-template-columns:1fr auto auto;padding:12px 14px;display:grid}.sidebar nav{display:none}.ghost{margin-top:0}.icon-text{min-height:40px;padding:0 12px}.brand small{display:none}.chat-header{padding:14px 16px}.chat-header h1{font-size:18px}.status-dot{display:none}.messages{padding:16px}.message{max-width:96%}.composer{grid-template-columns:42px 42px 1fr 46px;padding-left:10px;padding-right:10px}}