*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:#1f2328;background:#f6f8fa}.app{display:flex;min-height:100vh}.sidebar{width:220px;background:#161b22;color:#fff;padding:20px 0;flex-shrink:0}.brand{font-size:18px;padding:0 20px 20px;border-bottom:1px solid #30363d;margin-bottom:16px}.sidebar ul{list-style:none}.sidebar a{display:block;padding:10px 20px;color:#8b949e;text-decoration:none;transition:background .2s,color .2s}.sidebar a:hover{color:#fff;background:#21262d}.sidebar a.active{color:#fff;background:#1f6feb}.content{flex:1;padding:28px;overflow:auto}.page{max-width:1000px;margin:0 auto}.page h2{margin-bottom:20px;font-size:22px}.card{background:#fff;border:1px solid #d0d7de;border-radius:8px;padding:16px;margin-bottom:12px}.card h3{margin-bottom:6px;font-size:16px}.card .meta{color:#656d76;font-size:13px;margin-bottom:8px}.btn{background:#1f6feb;color:#fff;border:none;border-radius:6px;padding:8px 16px;cursor:pointer;font-size:14px}.btn:hover{background:#1b5cc8}input[type=text],input[type=search],textarea{width:100%;padding:8px 12px;border:1px solid #d0d7de;border-radius:6px;font-size:14px}.toolbar{display:flex;gap:12px;margin-bottom:20px}.error{color:#d1242f;padding:10px;background:#fff0f0;border-radius:6px;margin-bottom:12px}.chat-page{max-width:900px;margin:0 auto;display:flex;flex-direction:column;min-height:100%}.chat-header h2{margin-bottom:6px}.muted{color:#656d76;font-size:13px;line-height:1.6}.chat-suggestions{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 24px}.chip{background:#fff;border:1px solid #d0d7de;border-radius:999px;padding:6px 14px;font-size:13px;cursor:pointer;color:#1f6feb}.chip:hover{border-color:#1f6feb;background:#f0f6ff}.chat-messages{flex:1;display:flex;flex-direction:column;gap:16px;margin-bottom:16px}.chat-msg-head{font-size:12px;color:#656d76;margin-bottom:4px}.chat-msg.user .chat-msg-head{text-align:right}.chat-bubble{display:inline-block;max-width:82%;padding:12px 14px;border-radius:10px;line-height:1.75;font-size:14px;white-space:pre-wrap;word-break:break-word}.chat-msg.user .chat-bubble{background:#1f6feb;color:#fff;float:right}.chat-msg.assistant .chat-bubble{background:#fff;border:1px solid #d0d7de;display:block}.chat-note{margin-top:8px;font-size:12px;color:#9a6700}.cite{display:inline-block;min-width:18px;padding:0 4px;margin:0 2px;font-size:11px;line-height:16px;color:#1f6feb;background:#ddf4ff;border:1px solid #b6e3ff;border-radius:4px;cursor:pointer;vertical-align:super}.cite:hover{background:#1f6feb;color:#fff}.cite-missing{color:#d1242f;background:#fff0f0;border-color:#ffd7d7;cursor:default}.chat-sources{border:1px solid #d0d7de;border-radius:8px;background:#fff;padding:14px;margin-bottom:14px}.chat-sources h3{font-size:13px;color:#656d76;margin-bottom:10px}.source-item{display:flex;gap:10px;align-items:flex-start;padding:8px;border-radius:6px;text-decoration:none;color:inherit;border:1px solid transparent}.source-item:hover{background:#f6f8fa;border-color:#d0d7de}.source-idx{color:#1f6feb;font-weight:600;font-size:12px;flex-shrink:0}.source-body{flex:1;font-size:13px;line-height:1.6;min-width:0}.source-body em{color:#656d76;font-style:normal;font-size:12px}.source-snip{display:block;color:#656d76;font-size:12px;margin-top:3px}.source-score{font-size:11px;color:#8b949e;flex-shrink:0}.chat-input{display:flex;gap:10px;position:sticky;bottom:0;background:#f6f8fa;padding:12px 0;border-top:1px solid #d0d7de}.chat-input input{flex:1}.chat-input button{background:#1f6feb;color:#fff;border:none;border-radius:6px;padding:8px 22px;cursor:pointer;font-size:14px}.chat-input button:disabled{background:#8b949e;cursor:not-allowed}.dots{display:inline-flex;gap:4px;padding:2px 0}.dots i{width:6px;height:6px;border-radius:50%;background:#8b949e;animation:blink 1.2s infinite}.dots i:nth-child(2){animation-delay:.2s}.dots i:nth-child(3){animation-delay:.4s}@keyframes blink{0%,60%,to{opacity:.25}30%{opacity:1}}