:root{--bg:#f6f5f2;--panel:#fff;--ink:#1f2933;--muted:#5f6c76;--line:#d9e0e5;--brand:#246b61;--brand-dark:#174f48;--assistant:#edf7f4;--user:#23344d;--danger:#a23a35;--danger-bg:#fff0ee;--shadow:0 18px 50px #212b361f}*{box-sizing:border-box}html,body{min-height:100%}body{background:linear-gradient(180deg, #246b6114, #f6f5f200 260px), var(--bg);color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,textarea{font:inherit}.page-shell{min-height:100vh;padding:32px 16px}.chat-shell{background:var(--panel);width:min(920px,100%);min-height:calc(100vh - 64px);box-shadow:var(--shadow);border:1px solid #1f293314;border-radius:8px;grid-template-rows:auto 1fr auto;margin:0 auto;display:grid;overflow:hidden}.chat-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:16px;padding:20px 22px 16px;display:flex}.chat-title{margin:0;font-size:1.35rem;line-height:1.2}.chat-subtitle{max-width:680px;color:var(--muted);margin:8px 0 0;font-size:.95rem;line-height:1.45}.chat-subtitle.compact{font-size:.86rem;line-height:1.35}.new-button,.send-button{cursor:pointer;border:0;border-radius:7px;transition:background .15s,transform .15s,opacity .15s}.new-button{color:var(--brand-dark);background:#eef2f1;flex:none;padding:10px 13px}.new-button:hover,.send-button:hover{transform:translateY(-1px)}.messages{flex-direction:column;gap:14px;min-height:360px;padding:22px;display:flex;overflow-y:auto}.empty-state{max-width:560px;color:var(--muted);text-align:center;margin:auto;line-height:1.55}.message-row{display:flex}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.bubble{white-space:pre-wrap;overflow-wrap:anywhere;border-radius:8px;width:fit-content;max-width:min(72%,620px);padding:12px 14px;line-height:1.5}.message-row.user .bubble{background:var(--user);color:#fff}.message-row.assistant .bubble{background:var(--assistant);color:var(--ink)}.message-role{color:inherit;letter-spacing:0;opacity:.72;text-transform:uppercase;margin-bottom:5px;font-size:.72rem;font-weight:700;display:block}.composer-wrap{border-top:1px solid var(--line);background:#fffffff0;padding:16px 22px 20px}.error-banner{background:var(--danger-bg);color:var(--danger);border:1px solid #a23a3547;border-radius:7px;margin-bottom:12px;padding:11px 12px;line-height:1.4}.composer{grid-template-columns:1fr auto;align-items:end;gap:10px;display:grid}.composer textarea{resize:vertical;border:1px solid var(--line);width:100%;min-height:54px;max-height:160px;color:var(--ink);background:#fff;border-radius:7px;padding:13px 14px;line-height:1.45}.composer textarea:focus{border-color:var(--brand);outline:3px solid #246b6129}.send-button{background:var(--brand);color:#fff;min-width:96px;height:54px;padding:0 18px;font-weight:700}.send-button:disabled,.new-button:disabled{cursor:not-allowed;opacity:.58;transform:none}.typing{align-items:center;gap:4px;display:inline-flex}.typing span{background:var(--brand);border-radius:999px;width:6px;height:6px;animation:1.2s ease-in-out infinite typing}.typing span:nth-child(2){animation-delay:.16s}.typing span:nth-child(3){animation-delay:.32s}@keyframes typing{0%,80%,to{opacity:.35;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}@media (max-width:680px){.page-shell{padding:0}.chat-shell{border:0;border-radius:0;min-height:100vh}.chat-header{flex-direction:column;padding:18px 16px 14px}.new-button{width:100%}.messages{padding:16px}.bubble{max-width:88%}.composer-wrap{padding:14px 16px 16px}.composer{grid-template-columns:1fr}.send-button{width:100%}}