:root{--bg: #f4f6f9;--panel: #ffffff;--border: #dbe1e8;--text: #1c2733;--muted: #63707d;--accent: #2563eb;--accent-dark: #1d4ed8;--danger: #c0392b;--ok: #178a4c;--warn-bg: #fff6e0;--warn-border: #e8c766;--radius: 10px}*{box-sizing:border-box}body{margin:0;font-family:PingFang SC,Microsoft YaHei,Noto Sans SC,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.55}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;background:var(--panel);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:12px}.logo{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--accent);color:#fff;font-size:20px;font-weight:700;border-radius:9px}.brand h1{margin:0;font-size:18px}.brand p{margin:0;color:var(--muted);font-size:12px}.pill{padding:5px 12px;border-radius:999px;font-size:12px;border:1px solid var(--border);color:var(--muted);background:#fbfcfe;max-width:46vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pill-ok{color:var(--ok);border-color:var(--ok)}.pill-loading{color:var(--accent-dark);border-color:var(--accent)}.layout{display:grid;grid-template-columns:348px 1fr;gap:14px;padding:14px;height:calc(100vh - 118px);min-height:480px}.side{overflow-y:auto;display:flex;flex-direction:column;gap:14px;padding-right:2px}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}.card h2{margin:0 0 10px;font-size:15px}.kv>div{display:flex;justify-content:space-between;gap:10px;padding:2px 0}.kv span{color:var(--muted);flex-shrink:0}.kv b{font-weight:500;text-align:right;word-break:break-all}.field-label{display:block;margin:8px 0 4px;color:var(--muted);font-size:12px}.hint{color:var(--muted);font-size:12px;margin:6px 0}.select{width:100%;padding:7px 8px;border:1px solid var(--border);border-radius:7px;background:#fff;font-size:13px;color:var(--text)}.btn{padding:7px 14px;border-radius:7px;border:1px solid var(--border);background:#fff;color:var(--text);cursor:pointer;font-size:13px}.btn:hover{border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff;width:100%;margin-top:8px}.btn-primary:hover{background:var(--accent-dark)}.btn-ghost{background:#fbfcfe}.btn-danger{color:var(--danger)}.row{display:flex;gap:8px;align-items:center}.row .grow{flex:1}.row .btn{margin-top:0}.progress-wrap{margin-top:10px}.progress-bar{height:8px;background:#edf1f5;border-radius:99px;overflow:hidden}.progress-fill{height:100%;width:0%;background:var(--accent);transition:width .2s ease}.reminder{background:var(--warn-bg);border:1px solid var(--warn-border);border-radius:7px;padding:8px 10px;font-size:12px;margin-bottom:10px}.file-input{width:100%;font-size:12px}.doc-list{list-style:none;margin:10px 0;padding:0}.doc-list li{display:flex;justify-content:space-between;gap:8px;padding:5px 8px;border:1px solid var(--border);border-radius:7px;margin-bottom:6px;background:#fbfcfe}.doc-name{word-break:break-all}.doc-meta{color:var(--muted);flex-shrink:0;font-size:12px}.chat{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;min-width:0}.chat-head{display:flex;gap:8px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border)}.chat-head .select{max-width:320px}.messages{flex:1;overflow-y:auto;padding:16px 18px}.empty-tip{color:var(--muted);text-align:center;margin-top:8vh}.msg{margin-bottom:14px;display:flex;flex-direction:column}.msg-user{align-items:flex-end}.msg-assistant{align-items:flex-start}.bubble{max-width:78%;padding:9px 13px;border-radius:12px;white-space:pre-wrap;word-break:break-word}.msg-user .bubble{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.msg-assistant .bubble{background:#eef2f6;border-bottom-left-radius:4px}.cite-panel{max-width:78%;margin-top:6px;border:1px dashed var(--border);border-radius:8px;padding:8px 12px;background:#fbfcfe}.cite-title{font-size:12px;color:var(--muted);margin-bottom:4px}.cite-item{font-size:12px;margin-bottom:6px}.cite-item p{margin:2px 0 0;color:#44505c}.cite-idx{color:var(--accent-dark);font-weight:600}.composer{border-top:1px solid var(--border);padding:10px 14px 12px}.composer-row{display:flex;gap:10px;align-items:flex-end}.composer textarea{flex:1;resize:vertical;border:1px solid var(--border);border-radius:8px;padding:9px 11px;font:inherit}.composer-btns{display:flex;flex-direction:column;gap:6px}.composer-btns .btn-primary{margin-top:0;width:auto}.footer{padding:8px 20px;color:var(--muted);font-size:12px;text-align:center}@media (max-width: 900px){.layout{grid-template-columns:1fr;height:auto}.side{overflow:visible}.chat{min-height:70vh}}