:root{
  --ink:#0f1b2d; --ink2:#41546b; --muted:#8797ab;
  --line:#e2e8f1; --bg:#f3f6fb; --paper:#fff;
  --brand:#0b4f8a; --brand2:#1a7fc1; --accent:#c8102e;
  --term:#0b4f8a; --corpus:#0f9d58; --news:#c77700;
  --sans:"PingFang SC","Microsoft YaHei UI","Microsoft YaHei","Segoe UI",sans-serif;
  --serif:"Source Han Serif SC","Noto Serif SC",SimSun,serif;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{height:100%}
body.app{margin:0;background:var(--bg);color:var(--ink);font:14px/1.65 var(--sans);
  display:flex;height:100vh;overflow:hidden}

/* ---------- 侧边导航 ---------- */
.rail{width:68px;flex:0 0 68px;display:flex;flex-direction:column;align-items:center;
  padding:16px 0;background:linear-gradient(180deg,#0a2340 0%,#0b4f8a 100%);color:#fff}
.rail-logo{width:36px;height:36px;border-radius:10px;background:rgba(255,255,255,.14);
  display:grid;place-items:center;font-weight:800;font-size:16px;margin-bottom:26px;
  border:1px solid rgba(255,255,255,.18)}
.rail-nav{display:flex;flex-direction:column;gap:8px}
.rail-btn{width:42px;height:42px;border-radius:11px;border:0;background:transparent;color:rgba(255,255,255,.62);
  display:grid;place-items:center;cursor:pointer;transition:.18s}
.rail-btn:hover{background:rgba(255,255,255,.1);color:#fff}
.rail-btn.active{background:rgba(255,255,255,.16);color:#fff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.18)}
.rail-btn.bottom{margin-top:auto;text-decoration:none}

/* ---------- 主区 ---------- */
.stage{flex:1;min-width:0;display:flex;flex-direction:column;overflow:hidden}
.appbar{display:flex;align-items:center;gap:20px;padding:16px 26px;background:var(--paper);
  border-bottom:1px solid var(--line)}
.appbar h1{margin:0;font-family:var(--serif);font-size:20px;font-weight:700;letter-spacing:.5px}
.appbar p{margin:2px 0 0;font-size:12px;color:var(--muted)}
.chips{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.chip{font-size:11.5px;color:var(--ink2);background:#f4f7fb;border:1px solid var(--line);
  padding:4px 11px;border-radius:99px}
.chip b{color:var(--brand);font-weight:700;margin-right:2px}
.chip.engine{font-family:Consolas,monospace;font-size:10.5px;color:var(--muted)}

.view{flex:1;overflow-y:auto;padding:20px 26px 30px}
.view[hidden]{display:none}

/* ---------- 语言栏 ---------- */
.langbar{display:flex;align-items:flex-end;gap:12px;background:var(--paper);border:1px solid var(--line);
  border-radius:12px;padding:12px 14px;margin-bottom:14px}
.sel{display:flex;flex-direction:column;gap:4px}
.sel label{font-size:11px;color:var(--muted)}
.sel select{height:34px;min-width:150px;padding:0 10px;border:1px solid var(--line);border-radius:8px;
  background:#fff;font:inherit;font-size:13px;color:var(--ink);outline:none}
.sel select:focus{border-color:var(--brand2)}
.swap{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);background:#fff;
  color:var(--ink2);cursor:pointer;font-size:15px;transition:.2s}
.swap:hover{color:var(--brand);border-color:var(--brand2);transform:rotate(180deg)}
.langbar-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.hint{font-size:11.5px;color:var(--muted)}

.btn{height:34px;padding:0 18px;border-radius:8px;border:1px solid var(--line);background:#fff;
  color:var(--ink2);font:inherit;font-size:13px;cursor:pointer;transition:.15s}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));border:0;color:#fff;font-weight:600;
  box-shadow:0 6px 16px -8px rgba(11,79,138,.7)}
.btn.primary:hover{filter:brightness(1.07)}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---------- 双栏 ---------- */
.panes{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:16px}
.pane{background:var(--paper);border:1px solid var(--line);border-radius:12px;display:flex;
  flex-direction:column;min-height:240px;overflow:hidden}
.pane-head{display:flex;align-items:center;justify-content:space-between;padding:9px 14px;
  border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.mini{border:0;background:transparent;color:var(--brand2);font:inherit;font-size:11.5px;cursor:pointer}
.mini:hover{text-decoration:underline}
#input{flex:1;border:0;outline:none;resize:none;padding:14px 16px;font:inherit;font-size:15px;
  line-height:1.8;background:transparent;color:var(--ink);min-height:190px}
.out{flex:1;padding:14px 16px;font-size:15px;line-height:1.85;white-space:pre-wrap;overflow-y:auto;
  max-height:320px}
.out .ph{color:var(--muted)}
.out.streaming::after{content:"";display:inline-block;width:2px;height:1em;background:var(--brand2);
  margin-left:2px;vertical-align:text-bottom;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

/* ---------- 检索增强 ---------- */
.rag{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.rag-head{display:flex;align-items:baseline;gap:12px;margin-bottom:10px}
.rag-head h2{margin:0;font-size:13px;font-weight:600;color:var(--ink2)}
.rag-grid{display:grid;grid-template-columns:1.1fr 1.3fr 1fr;gap:12px}
.rag-col{min-width:0}
.rag-title{display:flex;align-items:center;gap:6px;font-size:11.5px;color:var(--muted);margin-bottom:6px}
.rag-title b{color:var(--ink)}
.dot{width:7px;height:7px;border-radius:50%}
.dot.term{background:var(--term)} .dot.corpus{background:var(--corpus)} .dot.news{background:var(--news)}
.rag-list{max-height:190px;overflow-y:auto;display:flex;flex-direction:column;gap:6px}
.rag-list .empty{color:var(--muted);font-size:12px;margin:6px 0}
.item{background:#f8fafd;border:1px solid var(--line);border-radius:8px;padding:7px 10px;font-size:12px}
.item .k{font-weight:600;color:var(--ink)}
.item .v{color:var(--brand2)}
.item .m{color:var(--muted);font-size:11px;margin-top:2px;line-height:1.5;
  overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.item a{color:inherit;text-decoration:none}
.item a:hover{color:var(--brand)}
.item .score{float:right;font-family:Consolas,monospace;font-size:10.5px;color:#9aabc2}

/* ---------- 问答 ---------- */
.qa-box{display:flex;flex-direction:column;height:100%;background:var(--paper);border:1px solid var(--line);
  border-radius:12px;overflow:hidden}
.qa-stream{flex:1;overflow-y:auto;padding:22px 26px}
.qa-hello h2{font-family:var(--serif);font-size:24px;margin:14px 0 8px}
.qa-hello p{margin:0 0 16px;color:var(--muted);font-size:13px;line-height:1.8;max-width:66ch}
.suggests{display:flex;flex-wrap:wrap;gap:8px}
.sug{border:1px solid var(--line);background:#fff;border-radius:18px;padding:6px 13px;
  font:inherit;font-size:12.5px;color:var(--ink2);cursor:pointer}
.sug:hover{border-color:var(--brand2);color:var(--brand)}
.msg{margin-bottom:18px}
.msg.user{display:flex;justify-content:flex-end}
.msg.user .bubble{background:var(--brand);color:#fff;border-radius:12px 12px 2px 12px;padding:8px 14px;
  max-width:74%}
.msg.bot .bubble{background:#f8fafd;border:1px solid var(--line);border-radius:2px 12px 12px 12px;
  padding:12px 15px;max-width:88%;white-space:pre-wrap;line-height:1.8}
.msg.bot .bubble.loading{color:var(--muted)}
.cite{color:var(--brand2);font-size:11px;vertical-align:super;cursor:pointer}
.sources{margin-top:8px;max-width:88%}
.src{display:flex;gap:9px;padding:8px 11px;border:1px solid var(--line);border-radius:8px;
  background:#fbfcfe;margin-bottom:5px;font-size:12px;align-items:flex-start}
.src .n{flex:0 0 18px;height:18px;border-radius:4px;background:#e4eef8;color:var(--brand);
  font-size:10.5px;font-weight:600;display:grid;place-items:center;margin-top:2px}
.src .b{flex:1;min-width:0}
.src a{color:var(--ink);font-weight:600;text-decoration:none}
.src .meta{display:block;color:var(--muted);font-size:10.5px;margin:1px 0 3px}
.src p{margin:0;color:var(--muted);line-height:1.5;overflow:hidden;display:-webkit-box;
  -webkit-line-clamp:2;-webkit-box-orient:vertical}
.tagx{font-size:10px;padding:0 6px;border-radius:4px;background:#eef3f9;color:var(--brand);margin-right:5px}
.qa-input{display:flex;gap:10px;padding:12px 18px;border-top:1px solid var(--line);background:#fff}
.qa-input textarea{flex:1;min-height:42px;max-height:120px;resize:none;padding:10px 12px;
  border:1px solid var(--line);border-radius:9px;font:inherit;font-size:14px;outline:none}
.qa-input textarea:focus{border-color:var(--brand2);box-shadow:0 0 0 3px rgba(26,127,193,.1)}

/* ---------- 资料 ---------- */
.asset-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:16px}
.asset-card{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.asset-card .tag{font-size:10px;letter-spacing:1.2px;color:var(--muted)}
.asset-card b{display:block;font-family:var(--serif);font-size:30px;line-height:1.3;margin:4px 0 6px;
  color:var(--brand)}
.asset-card p{margin:0;font-size:12px;color:var(--muted);line-height:1.6}
.searchbar{display:flex;gap:10px;align-items:center;margin-bottom:12px}
.searchbar input{flex:1;height:38px;padding:0 14px;border:1px solid var(--line);border-radius:9px;
  font:inherit;font-size:13.5px;outline:none;background:#fff}
.searchbar input:focus{border-color:var(--brand2);box-shadow:0 0 0 3px rgba(26,127,193,.1)}
.filters{display:flex;gap:5px}
.fchip{height:30px;padding:0 12px;border-radius:8px;border:1px solid var(--line);background:#fff;
  color:var(--muted);font-size:12px;cursor:pointer}
.fchip.active{background:var(--brand);border-color:var(--brand);color:#fff}
.results{display:flex;flex-direction:column;gap:8px}
.result{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:11px 14px}
.result .h{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600}
.result .body{margin:5px 0 0;font-size:12.5px;color:var(--ink2);line-height:1.65}
.result .body em{font-style:normal;background:#fff3c4;padding:0 1px}
.results .empty{color:var(--muted);font-size:12.5px}

.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,14px);background:#122033;color:#fff;
  padding:9px 18px;border-radius:8px;font-size:13px;opacity:0;pointer-events:none;transition:.2s;z-index:50}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:1080px){
  .rag-grid{grid-template-columns:1fr}
  .asset-cards{grid-template-columns:1fr}
  .panes{grid-template-columns:1fr}
}