:root{--bg: #ffffff;--panel: #f5f5f4;--text: #1c1917;--muted: #78716c;--border: #e7e5e4;--accent: #b45309;--accent-text: #ffffff;--user: #f5f5f4;--error: #b91c1c;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}@media(prefers-color-scheme:dark){:root{--bg: #1c1917;--panel: #292524;--text: #f5f5f4;--muted: #a8a29e;--border: #44403c;--accent: #f59e0b;--accent-text: #1c1917;--user: #292524;--error: #f87171}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text)}button{font:inherit;border:0;border-radius:10px;padding:9px 16px;cursor:pointer;background:var(--accent);color:var(--accent-text);font-weight:600}button:disabled{opacity:.45;cursor:default}button.ghost,button.link{background:transparent;color:var(--text);border:1px solid var(--border)}button.link{border:0;padding:4px 8px;color:var(--muted);font-weight:400}textarea,input,select{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:10px 12px;width:100%}.muted{color:var(--muted)}.error{color:var(--error)}.row{display:flex;gap:8px;flex-wrap:wrap}.center{min-height:100%;display:grid;place-items:center;padding:16px}.card{width:100%;max-width:440px;display:flex;flex-direction:column;gap:14px}.card h1{margin:0;font-size:1.6rem}.card p{margin:0;line-height:1.5}.card label{display:flex;flex-direction:column;gap:6px;font-size:.9rem;color:var(--muted)}.steps{margin:0;padding-left:20px;line-height:1.6}.shell{display:grid;grid-template-columns:260px 1fr;height:100%}.sidebar{background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.sidebar .new{margin:12px}.sidebar nav{flex:1;overflow-y:auto;padding:0 8px}.item{display:flex;align-items:center;border-radius:8px}.item.active,.item:hover{background:var(--border)}.item .title{flex:1;text-align:left;background:transparent;color:var(--text);font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:8px 10px}.item .delete{background:transparent;color:var(--muted);padding:4px 10px;visibility:hidden}.item:hover .delete,.item.active .delete{visibility:visible}.sidebar footer{display:flex;justify-content:space-between;align-items:center;padding:12px;border-top:1px solid var(--border);font-size:.85rem}.chat{display:flex;flex-direction:column;min-width:0;min-height:0}.chat header{display:flex;gap:8px;align-items:center;padding:10px 16px;border-bottom:1px solid var(--border)}.chat header select{width:auto;max-width:100%}.menu{display:none;background:transparent;color:var(--text);padding:6px 10px}.messages{flex:1;overflow-y:auto;padding:24px 16px;display:flex;flex-direction:column;gap:14px;max-width:800px;width:100%;margin:0 auto}.empty{margin:auto;text-align:center}.empty h2{margin:0 0 6px}.bubble{white-space:pre-wrap;line-height:1.55;overflow-wrap:anywhere}.bubble.user{align-self:flex-end;background:var(--user);padding:10px 14px;border-radius:16px;max-width:85%}.bubble.assistant{align-self:stretch}.dots{color:var(--muted)}.composer{display:flex;gap:8px;padding:12px 16px 16px;max-width:800px;width:100%;margin:0 auto;align-items:flex-end}.composer textarea{resize:none;max-height:200px}@media(max-width:720px){.shell{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 30% 0 0;z-index:10;transform:translate(-100%);transition:transform .2s}.menu-open .sidebar{transform:none;box-shadow:0 0 0 100vmax #00000059}.menu{display:inline-block}}.notice{display:flex;gap:12px;align-items:center;margin:8px 16px 0;padding:10px 12px;border:1px solid var(--border, rgba(127,127,127,.3));border-radius:10px;font-size:14px}.notice span{flex:1}