:root{--bg:#f5efe2;--panel:#fffdf8;--line:#d5c7af;--text:#1f2b3a;--muted:#6d7b8f;--accent:#0a7b83;--accent-soft:#d9f0ef}*{box-sizing:border-box}body,html{margin:0;padding:0;font-family:IBM Plex Sans,Segoe UI,sans-serif;background:radial-gradient(circle at top right,#efe4cd,#f5efe2 45%,#f8f4ec);color:var(--text);min-height:100%}.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{border-right:1px solid var(--line);padding:16px;background:linear-gradient(160deg,#f3e7cf,#f7f2e8)}.sidebar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.sidebar-header h1{margin:0;font-size:20px}.chat-header button,.composer button,.settings-panel button,.sidebar button{border:1px solid var(--accent);background:var(--accent-soft);color:var(--text);border-radius:8px;padding:8px 12px;cursor:pointer}.conversation-list{display:grid;grid-gap:8px;gap:8px}.conversation-item{text-align:left;border:1px solid transparent;border-radius:10px;padding:10px;background:transparent;color:var(--text)}.conversation-item.active{border-color:var(--accent);background:#ffffffbf}.chat-panel{display:grid;grid-template-rows:auto auto 1fr auto;min-height:100vh}.chat-header{border-bottom:1px solid var(--line);padding:12px 16px;background:var(--panel);display:grid;grid-gap:10px;gap:10px}.title-input{border:1px solid var(--line);border-radius:8px;font-size:18px;padding:8px 10px;max-width:420px}.meta-strip{color:var(--muted);font-size:13px}.controls-row,.meta-strip{display:flex;flex-wrap:wrap;gap:12px}.controls-row label{display:grid;grid-gap:6px;gap:6px;color:var(--muted);font-size:13px}.controls-row input,.controls-row select,.settings-panel input,.settings-panel textarea{border:1px solid var(--line);border-radius:8px;padding:8px;min-width:160px;font:inherit}.controls-row .grow{flex:1 1}.settings-panel{margin:10px 16px;border:1px solid var(--line);border-radius:12px;padding:12px;display:grid;grid-gap:10px;gap:10px;background:var(--panel)}.settings-panel label{display:grid;grid-gap:6px;gap:6px}.files-panel{border-bottom:1px solid var(--line);padding:10px 16px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}.upload-label{display:inline-flex;gap:10px;align-items:center;color:var(--muted)}.file-list{display:flex;gap:8px;flex-wrap:wrap}.file-list span{background:#eaf0f3;border-radius:999px;padding:4px 10px;font-size:12px}.message-list{overflow:auto;padding:16px;display:grid;grid-gap:10px;gap:10px}.message{border-radius:12px;padding:12px;max-width:900px;border:1px solid var(--line);background:var(--panel)}.message.user{justify-self:end;background:#dff2f6}.message-role{font-size:12px;text-transform:uppercase;color:var(--muted);margin-bottom:6px}.message-content{white-space:pre-wrap;line-height:1.5}.citations{margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}.citations span{font-size:12px;color:#0d5a5f;background:#d8eef0;border-radius:999px;padding:2px 8px}.composer{border-top:1px solid var(--line);padding:12px 16px;display:flex;gap:10px;background:var(--panel)}.composer textarea{flex:1 1;border:1px solid var(--line);border-radius:8px;padding:10px;font:inherit;resize:vertical}.toast{position:fixed;right:16px;top:16px;background:#7f1d1d;color:#fff;border-radius:10px;padding:10px 12px;display:flex;gap:8px;align-items:center}.toast button{border:1px solid #fff;border-radius:8px;background:transparent;color:#fff}@media (max-width:960px){.app-shell{grid-template-columns:1fr}.sidebar{border-right:none;border-bottom:1px solid var(--line)}.chat-panel{min-height:calc(100vh - 220px)}}