:root{--bg:#fbfbf9;--panel:#fff;--ink:#1c1c1a;--muted:#6b6b63;--line:#e2e2dc;--accent:#1f5f8b;--user:#eaf2f7;--history-w:264px}*{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:var(--history-w) 1fr;height:100dvh;display:grid}.app.closed{grid-template-columns:1fr}.app.closed .history{display:none}.history{background:var(--panel);border-right:1px solid var(--line);overscroll-behavior:contain;padding:12px;overflow-y:auto}.history-top{justify-content:space-between;align-items:center;padding-right:2px;display:flex}.collapse{font:inherit;color:var(--muted);cursor:pointer;background:0 0;border:0;padding:4px 8px;font-size:20px;line-height:1;display:none}.history h2{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:8px 6px;font-size:12px}.session{text-align:left;width:100%;min-height:44px;font:inherit;cursor:pointer;color:var(--ink);-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;touch-action:manipulation;background:0 0;border:1px solid #0000;border-radius:8px;flex-direction:column;justify-content:center;padding:8px 10px;font-size:14px;display:flex}.session:hover{background:#f2f2ee}.session:active{background:#eceae4}.session.active{border-color:var(--accent);background:var(--user)}.session .when{color:var(--muted);font-size:12px;display:block}.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}.thread header .note{color:var(--muted);font-size:12px}.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 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{background:var(--accent);color:#fff;min-height:44px;font:inherit;cursor:pointer;touch-action:manipulation;border:0;border-radius:8px;padding:0 16px}button.new{background:#557;width:100%;margin-bottom:10px}button:disabled{opacity:.5;cursor:default}.drawer-toggle{border:1px solid var(--line);min-width:44px;min-height:44px;font:inherit;cursor:pointer;touch-action:manipulation;background:0 0;border-radius:8px;padding:4px 10px}.scrim{display:none}.menu-scrim{z-index:30;background:#00000047;position:fixed;inset:0}.row-menu{z-index:31;background:var(--panel);border:1px solid var(--line);border-radius:10px;min-width:140px;padding:4px;position:fixed;box-shadow:0 6px 20px #0000002e}.row-menu button{text-align:left;width:100%;min-height:44px;font:inherit;cursor:pointer;touch-action:manipulation;background:0 0;border:0;border-radius:8px;padding:10px 12px;font-size:14px;display:block}.row-menu button.danger{color:#a3322a}.row-menu button:active{background:#f2f2ee}@media (hover:none){.session:hover{background:0 0}}@media (width>=761px){.collapse{display:block}}@media (width<=760px){.app,.app.closed{grid-template-columns:1fr}.history,.app.closed .history{z-index:20;width:82vw;max-width:320px;padding-top:calc(12px + env(safe-area-inset-top));padding-bottom:calc(12px + env(safe-area-inset-bottom));transition:transform .18s;display:block;position:fixed;inset:0 auto 0 0;transform:translate(-100%);box-shadow:0 0 24px #0000002e}.history.open{transform:translate(0)}.collapse{display:block}.scrim{z-index:15;background:#0000004d;display:block;position:fixed;inset:0}.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))}}