*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #ffffff;--sidebar-bg: #f4f4f4;--border: #e0e0e0;--ink: #1a1a1a;--ink-muted: #888888;--accent: #2563eb;--accent-hover: #1d4ed8;--user-bubble: #2563eb;--user-text: #ffffff;--assistant-bubble: #f0f0f0;--assistant-text: #1a1a1a;--error: #dc2626;--radius: 8px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.5}.layout{display:grid;grid-template-columns:260px 1fr;height:100vh}.sidebar{display:flex;flex-direction:column;background:var(--sidebar-bg);border-right:1px solid var(--border);overflow:hidden}.sidebar-header{padding:16px;font-size:18px;font-weight:700;border-bottom:1px solid var(--border)}.new-chat-btn{margin:12px;padding:10px;border:1px dashed var(--border);border-radius:var(--radius);background:transparent;color:var(--accent);font-size:14px;font-weight:600;cursor:pointer;transition:background .15s}.new-chat-btn:hover{background:#2563eb14}.session-list{flex:1;overflow-y:auto;padding:4px 0}.session-item{display:flex;align-items:center;padding:10px 12px;margin:2px 8px;border-radius:var(--radius);cursor:pointer;transition:background .15s;gap:8px}.session-item:hover{background:#0000000d}.session-item.active{background:#2563eb1a;font-weight:600}.session-item-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}.session-item .delete-btn{opacity:0;border:none;background:transparent;color:var(--ink-muted);cursor:pointer;font-size:16px;padding:2px 6px;border-radius:4px;transition:opacity .15s,color .15s;flex-shrink:0}.session-item:hover .delete-btn{opacity:1}.session-item .delete-btn:hover{color:var(--error)}.chat-view{display:flex;flex-direction:column;height:100vh;overflow:hidden}.chat-header{padding:12px 20px;border-bottom:1px solid var(--border);font-weight:600;font-size:16px;display:flex;align-items:center;justify-content:space-between}.chat-header .latency{font-weight:400;font-size:13px;color:var(--ink-muted)}.message-list{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px}.empty-state{flex:1;display:flex;align-items:center;justify-content:center;color:var(--ink-muted);font-size:15px}.bubble{max-width:75%;padding:12px 16px;border-radius:var(--radius);font-size:15px;line-height:1.6;word-wrap:break-word}.bubble-user{align-self:flex-end;background:var(--user-bubble);color:var(--user-text);border-bottom-right-radius:2px}.bubble-assistant{align-self:flex-start;background:var(--assistant-bubble);color:var(--assistant-text);border-bottom-left-radius:2px}.bubble-assistant p{margin-bottom:8px}.bubble-assistant p:last-child{margin-bottom:0}.bubble-assistant pre{background:#1e1e1e;color:#d4d4d4;padding:12px;border-radius:6px;overflow-x:auto;margin:8px 0;font-size:13px}.bubble-assistant code{font-family:Fira Code,Consolas,monospace;font-size:13px}.bubble-assistant :not(pre)>code{background:#00000014;padding:2px 5px;border-radius:3px}.bubble-assistant ul,.bubble-assistant ol{padding-left:20px;margin:8px 0}.bubble .msg-latency{display:block;margin-top:6px;font-size:12px;color:var(--ink-muted);text-align:right}.bubble-user .msg-latency{color:#ffffffb3}.thinking{color:var(--ink-muted);font-style:italic}.sources-panel{margin-top:8px;border:1px solid var(--border);border-radius:6px;font-size:13px}.sources-panel summary{padding:8px 12px;cursor:pointer;color:var(--accent);font-weight:600;-webkit-user-select:none;user-select:none}.sources-panel summary:hover{background:#2563eb0d}.sources-panel ul{list-style:none;padding:0 12px 8px}.sources-panel li{padding:6px 0;border-top:1px solid var(--border)}.sources-panel .source-file{font-weight:600;color:var(--ink)}.sources-panel .source-score{color:var(--ink-muted);margin-left:8px;font-size:12px}.sources-panel .source-text{margin-top:4px;color:var(--ink-muted);font-size:12px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.chat-input-area{display:flex;gap:8px;padding:16px 20px;border-top:1px solid var(--border);background:var(--bg)}.chat-input-area input{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:15px;font-family:var(--font);outline:none;transition:border-color .15s}.chat-input-area input:focus{border-color:var(--accent)}.chat-input-area input:disabled{background:var(--sidebar-bg);color:var(--ink-muted)}.chat-input-area button{padding:10px 20px;border:none;border-radius:var(--radius);background:var(--accent);color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s}.chat-input-area button:hover:not(:disabled){background:var(--accent-hover)}.chat-input-area button:disabled{opacity:.5;cursor:not-allowed}.error-msg{color:var(--error);font-size:14px;padding:8px 12px;background:#fef2f2;border-radius:var(--radius);align-self:center}