:root{--bg:#f4f4f0;--surface:#fff;--text:#1a1a1a;--text-secondary:#666;--border:#d0d0cc;--border-light:#e8e8e4;--accent:#c8390a;--accent-muted:#f0e8e4;--user-bubble:#1a1a1a;--doc-bubble:#fff;--rule:#1a1a1a}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100dvh;margin:0;padding:0;font-family:Helvetica Neue,Helvetica,Arial,sans-serif}.chat-container{background:var(--surface);border-left:1px solid var(--border);border-right:1px solid var(--border);flex-direction:column;max-width:860px;height:100dvh;margin:0 auto;display:flex}.header{background:var(--surface);border-bottom:2px solid var(--rule);flex-shrink:0;justify-content:space-between;align-items:center;height:64px;padding:0 2rem;display:flex}.header-brand{align-items:baseline;gap:.5rem;display:flex}.header-brand h1{letter-spacing:.12em;text-transform:uppercase;color:var(--text);margin:0;font-size:1.125rem;font-weight:700}.header-tagline{letter-spacing:.06em;text-transform:uppercase;color:var(--text-secondary);font-size:.65rem;font-weight:400}.header-dot{background:var(--accent);border-radius:50%;flex-shrink:0;width:8px;height:8px}.disclaimer-banner{background:var(--surface);border-bottom:1px solid var(--border-light);letter-spacing:.04em;text-transform:uppercase;color:var(--text-secondary);flex-shrink:0;padding:.55rem 2rem;font-size:.65rem;font-weight:500}.messages{scroll-behavior:smooth;flex-direction:column;flex:1;gap:0;padding:2rem;display:flex;overflow-y:auto}.message{border-bottom:1px solid var(--border-light);gap:1.25rem;padding:1.5rem 0;display:flex}.message:first-child{border-top:1px solid var(--border-light)}.avatar{flex-shrink:0;justify-content:center;align-items:flex-start;width:28px;margin-top:3px;display:flex}.avatar-label{letter-spacing:.1em;text-transform:uppercase;color:var(--text-secondary);font-size:.55rem;font-weight:700}.avatar.user .avatar-label{color:var(--text)}.bubble{color:var(--text);flex:1;font-size:.9rem;line-height:1.7}.message.user .bubble{font-weight:500}.bubble p{margin:0 0 .75em}.bubble p:last-child{margin-bottom:0}.typing-indicator{align-items:center;gap:5px;padding:4px 0;display:flex}.typing-dot{background:var(--border);border-radius:50%;width:5px;height:5px;animation:1.2s infinite bounce}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,60%,to{opacity:.35;transform:translateY(0)}30%{opacity:1;transform:translateY(-5px)}}.empty-state{flex-direction:column;flex:1;justify-content:center;padding:3rem 0;display:flex}.empty-rule{background:var(--rule);height:2px;margin-bottom:2rem}.empty-state h2{letter-spacing:-.03em;margin:0 0 1rem;font-size:2.75rem;font-weight:700;line-height:1.1}.empty-state p{color:var(--text-secondary);max-width:380px;margin:0 0 2.5rem;font-size:.875rem;line-height:1.65}.quick-topics{border-top:1px solid var(--border-light);flex-wrap:wrap;flex-shrink:0;gap:.5rem;padding:1rem 2rem;display:flex}.quick-topic-btn{color:var(--text);border:1px solid var(--border);letter-spacing:.06em;text-transform:uppercase;cursor:pointer;background:0 0;border-radius:0;padding:.4rem .9rem;font-family:inherit;font-size:.72rem;font-weight:500;transition:all .1s}.quick-topic-btn:hover{background:var(--text);color:var(--surface);border-color:var(--text)}.input-area{border-top:2px solid var(--rule);background:var(--surface);flex-shrink:0;align-items:flex-end;gap:.875rem;padding:1.25rem 2rem;display:flex}.input-area textarea{border:1px solid var(--border);resize:none;background:var(--bg);max-height:120px;color:var(--text);border-radius:0;outline:none;flex:1;padding:.75rem 1rem;font-family:inherit;font-size:.875rem;line-height:1.55;transition:border-color .1s}.input-area textarea::placeholder{color:var(--text-secondary);letter-spacing:.03em;font-size:.8rem}.input-area textarea:focus{border-color:var(--text);background:var(--surface)}.send-btn{background:var(--text);color:var(--surface);cursor:pointer;border:none;border-radius:0;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;transition:background .1s;display:flex}.send-btn:hover:not(:disabled){background:var(--accent)}.send-btn:disabled{opacity:.3;cursor:not-allowed}@media (max-width:600px){.header{padding:0 1.25rem}.disclaimer-banner{padding:.5rem 1.25rem}.messages{padding:1.25rem}.message{gap:.875rem}.empty-state h2{font-size:2rem}.quick-topics{padding:.75rem 1.25rem}.input-area{padding:1rem 1.25rem}}