:root{--bg:#fbfbf9;--panel:#fff;--ink:#1c1c1a;--muted:#6b6b63;--line:#e2e2dc;--accent:#1f5f8b;--user:#eaf2f7}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}html,body,#root{height:100%}body{background:var(--bg);color:var(--ink);margin:0;font-family:Noto Sans Sinhala,Iskoola Pota,Nirmala UI,system-ui,sans-serif;font-size:16px;line-height:1.65}.app{grid-template-columns:1fr;height:100dvh;display:grid}.thread{flex-direction:column;min-height:0;display:flex}.thread header{padding:10px 16px;padding-top:calc(10px + env(safe-area-inset-top));border-bottom:1px solid var(--line);background:var(--panel);align-items:center;gap:10px;display:flex}.thread header .title{text-overflow:ellipsis;white-space:nowrap;min-width:0;font-weight:600;overflow:hidden}.messages{overscroll-behavior:contain;flex-direction:column;flex:1;gap:12px;padding:16px;display:flex;overflow-y:auto}.msg{overflow-wrap:anywhere;max-width:68ch}.msg.user{background:var(--user);border:1px solid #d6e3ee;border-radius:10px;align-self:flex-end;padding:8px 12px}.msg.assistant{background:var(--panel);border:1px solid var(--line);border-radius:10px;align-self:flex-start;padding:8px 12px}.msg .part{margin:0 0 .6em}.msg .part:last-child{margin-bottom:0}.msg .part p{margin:0 0 .5em}.msg .part p:last-child{margin-bottom:0}.msg .part ul{margin:0;padding-left:1.15em}.msg .part li{margin:0 0 .35em}.msg .part li:last-child{margin-bottom:0}.msg pre{background:#f4f4f0;border-radius:6px;padding:8px;font-size:13px;overflow-x:auto}.msg .tool{color:var(--muted);border-left:2px solid var(--line);white-space:pre-wrap;margin:6px 0;padding-left:8px;font-size:12px}.composer{padding:12px 16px;padding-bottom:calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--panel);gap:8px;display:flex}.composer textarea{resize:none;min-height:44px;max-height:160px;font:inherit;border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:8px;flex:1;padding:10px}button.send,button.new-chat{background:var(--accent);color:#fff;min-height:44px;font:inherit;cursor:pointer;touch-action:manipulation;border:0;border-radius:8px;padding:0 16px}.new-chat{border:1px solid var(--line);min-height:36px;font:inherit;color:var(--muted);cursor:pointer;touch-action:manipulation;background:0 0;border-radius:8px;margin-left:auto;padding:4px 10px;font-size:13px}button:disabled{opacity:.5;cursor:default}@media (width<=760px){.messages{padding:12px 10px}.msg{max-width:100%}.composer{padding:10px;padding-bottom:calc(10px + env(safe-area-inset-bottom))}.thread header{padding:8px 10px;padding-top:calc(8px + env(safe-area-inset-top))}}