:root{--bg:#ffffff;--fg:#16181d;--muted:#6b7280;--line:#e5e7eb;--panel:#f6f7f9;--accent:#2f6f4f;--err:#b42318}@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--fg:#e8eaed;--muted:#9aa0a6;--line:#262b33;--panel:#171a20;--accent:#6cc79a;--err:#f97066}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.6 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{flex-direction:column;height:100dvh;max-width:820px;margin:0 auto}.app,.bar{display:flex}.bar{align-items:center;gap:12px;padding:10px 16px;border-bottom:1px solid var(--line)}.brand{font-weight:650;letter-spacing:-.01em}.spacer{flex:1 1}.bar button,.bar select{font:inherit;font-size:13px;padding:5px 10px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--fg);cursor:pointer}.bar button:disabled{opacity:.45;cursor:default}.toggle{display:flex;align-items:center;gap:5px;font-size:13px;color:var(--muted);cursor:pointer}.thread{flex:1 1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:18px}.empty{color:var(--muted);text-align:center;margin:auto 0}.empty .hint{font-size:13px;max-width:46ch;margin:8px auto 0}.msg{display:flex;flex-direction:column;gap:8px}.msg.user{align-items:flex-end}.msg.user .body{background:var(--panel);padding:9px 13px;border-radius:14px 14px 3px 14px;max-width:80%}.msg.assistant .body{white-space:pre-wrap}.sent-img{max-width:220px;border-radius:10px;border:1px solid var(--line)}.reasoning{border-left:2px solid var(--line);padding-left:10px}.reasoning button{background:none;border:0;padding:0;font:inherit;cursor:pointer}.reasoning button,.reasoning pre{font-size:12.5px;color:var(--muted)}.reasoning pre{margin:8px 0 0;white-space:pre-wrap;max-height:320px;overflow-y:auto}.tool{background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:9px 11px;font-size:13px}.tool-name{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);font-weight:600}.tool pre{margin:6px 0 0;font-size:12px;white-space:pre-wrap;overflow-x:auto}.dots{color:var(--muted)}.err{color:var(--err);font-size:13px;border:1px solid var(--err);border-radius:8px;padding:8px 11px}.meta{font-size:11.5px;color:var(--muted)}.composer{border-top:1px solid var(--line);padding:12px 16px 16px}.row{display:flex;gap:8px;align-items:flex-end}.composer textarea{flex:1 1;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:11px;background:var(--bg);color:var(--fg);resize:none;max-height:180px;field-sizing:content}.composer textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.attach{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);font-size:19px;color:var(--muted)}.attach,.composer button{border-radius:10px;cursor:pointer;flex:none}.composer button{font:inherit;padding:9px 17px;border:0}.send{background:var(--accent);color:#fff}.send:disabled{opacity:.4;cursor:default}.stop{background:var(--panel);color:var(--fg);border:1px solid var(--line)!important}.thumbs{display:flex;gap:8px;margin-bottom:9px;flex-wrap:wrap}.thumb{position:relative}.thumb img{width:58px;height:58px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}.thumb button{position:absolute;top:-6px;right:-6px;width:19px;height:19px;border-radius:50%;border:0;background:var(--fg);color:var(--bg);cursor:pointer;font-size:13px;line-height:1;padding:0}.hamburger{background:none!important;border:0!important;font-size:17px;color:var(--muted);padding:4px 6px!important;cursor:pointer}.scrim{position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:9}.sidebar{position:fixed;left:0;top:0;bottom:0;width:272px;background:var(--bg);border-right:1px solid var(--line);z-index:10;display:flex;flex-direction:column;padding:12px;overflow-y:auto}.sidebar-head{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:10px}.sidebar-head button{font:inherit;font-size:12.5px;padding:4px 9px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--fg);cursor:pointer}.sidebar-empty{font-size:13px;color:var(--muted)}.sidebar ul{list-style:none;margin:0;padding:0}.sidebar li{display:flex;align-items:center;gap:4px;border-radius:8px}.sidebar li.active,.sidebar li:hover{background:var(--panel)}.conv{flex:1 1;text-align:left;background:none;border:0;padding:8px 9px;cursor:pointer;color:var(--fg);font:inherit;font-size:13px}.conv,.conv-title{overflow:hidden;display:block}.conv-title{white-space:nowrap;text-overflow:ellipsis}.conv-date{display:block;font-size:11px;color:var(--muted);margin-top:2px}.conv-del{background:none;border:0;color:var(--muted);cursor:pointer;font-size:15px;padding:4px 8px;flex:none}.conv-del:hover{color:var(--err)}