:root{
  --brand:#0e7490; --brand-2:#0891b2; --brand-soft:#ecfeff;
  --bg:#f6f7f9; --panel:#ffffff; --side:#0f172a; --side-2:#1e293b;
  --text:#0f172a; --muted:#64748b; --line:#e2e8f0;
  --user-bub:#0e7490; --radius:14px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:15px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",
       "Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
.hidden{display:none!important}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea{font:inherit;color:inherit}

/* ---------- 登录 ---------- */
.login-wrap{
  min-height:100dvh;display:grid;place-items:center;padding:24px;
  background:
    radial-gradient(1200px 600px at 15% -10%,#0e749022,transparent 60%),
    radial-gradient(900px 500px at 110% 110%,#0891b21f,transparent 60%),
    linear-gradient(#f8fafc,#eef2f6);
}
.login-wrap::before{                      /* 淡淡的走线纹理，点明 PCB 这门生意 */
  content:"";position:fixed;inset:0;pointer-events:none;opacity:.16;
  background-image:
    linear-gradient(var(--brand) 1px,transparent 1px),
    linear-gradient(90deg,var(--brand) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:radial-gradient(700px 420px at 50% 40%,#000 30%,transparent 75%);
          mask-image:radial-gradient(700px 420px at 50% 40%,#000 30%,transparent 75%);
}
.login-card{
  position:relative;width:min(400px,100%);background:var(--panel);
  border:1px solid var(--line);border-radius:20px;padding:34px 30px 26px;
  box-shadow:0 24px 60px -28px #0f172a4d;display:flex;flex-direction:column;gap:14px;
}
.logo{display:flex;align-items:center;gap:14px;color:var(--brand);margin-bottom:6px}
.logo h1{margin:0;font-size:20px;color:var(--text);letter-spacing:.3px}
.logo p{margin:3px 0 0;font-size:12.5px;color:var(--muted)}
.login-card label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
.login-card input{
  padding:11px 13px;border:1px solid var(--line);border-radius:10px;background:#fff;
  transition:border-color .15s,box-shadow .15s;
}
.login-card input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #0e749020}
.primary{
  margin-top:6px;padding:11px;border-radius:10px;color:#fff;font-weight:600;letter-spacing:2px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 8px 20px -10px var(--brand);
}
.primary:disabled{opacity:.6;cursor:default}
.demo-row{display:flex;flex-direction:column;gap:10px}
.or{display:flex;align-items:center;gap:10px;color:#94a3b8;font-size:12px;margin-top:2px}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.ghost{
  padding:10px;border-radius:10px;border:1px solid var(--brand);color:var(--brand);
  font-weight:600;background:#fff;transition:.15s;
}
.ghost:hover{background:var(--brand-soft)}
.ghost:disabled{opacity:.6;cursor:default}
.err{margin:0;min-height:18px;font-size:13px;color:#dc2626}
.hint{margin:2px 0 0;font-size:12px;color:var(--muted);text-align:center}

/* ---------- 布局 ---------- */
.app{display:flex;height:100dvh;overflow:hidden}
.side{
  width:262px;flex:none;background:var(--side);color:#cbd5e1;
  display:flex;flex-direction:column;padding:12px 10px;gap:10px;
}
.side-top{display:flex;gap:8px}
.new-chat{
  flex:1;padding:10px;border-radius:10px;color:#e2e8f0;font-weight:600;
  border:1px dashed #ffffff2e;transition:background .15s,border-color .15s;
}
.new-chat:hover{background:#ffffff12;border-color:#ffffff55}
.conv-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;margin:0 -4px;padding:0 4px}
.conv{
  display:flex;align-items:center;gap:8px;padding:9px 10px;border-radius:9px;
  font-size:13.5px;color:#cbd5e1;cursor:pointer;
}
.conv:hover{background:#ffffff10}
.conv.active{background:var(--brand);color:#fff}
.conv span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv .del{opacity:0;font-size:12px;padding:2px 4px;border-radius:5px}
.conv:hover .del{opacity:.65}
.conv .del:hover{opacity:1;background:#ffffff22}
.side-foot{border-top:1px solid #ffffff17;padding-top:8px;display:flex;flex-direction:column;gap:2px}
.foot-btn{
  display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:9px;
  font-size:13.5px;color:#cbd5e1;text-align:left;
}
.foot-btn:hover{background:#ffffff10}
.foot-btn em{margin-left:auto;font-style:normal;font-size:12px;color:#94a3b8}
.user-row{display:flex;align-items:center;gap:8px;margin-top:6px;padding:8px 6px 2px;border-top:1px solid #ffffff17}
.avatar{
  width:28px;height:28px;flex:none;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:13px;font-weight:600;
}
.user-name{flex:1;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-btn{padding:5px 7px;border-radius:8px;color:inherit;opacity:.75}
.icon-btn:hover{opacity:1;background:#ffffff14}

.main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.topbar{
  display:flex;align-items:center;gap:10px;padding:12px 20px;
  border-bottom:1px solid var(--line);background:#fffffff2;backdrop-filter:blur(8px);
}
.topbar .icon-btn{color:var(--text)}
.topbar .icon-btn:hover{background:#0f172a0d}
.title{flex:1;font-weight:600;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.model-tag{font-size:11.5px;color:var(--muted);border:1px solid var(--line);padding:3px 9px;border-radius:20px}

/* ---------- 消息流 ---------- */
.stream{flex:1;overflow-y:auto;padding:26px 20px 10px;scroll-behavior:smooth}
.empty{max-width:760px;margin:8vh auto 0;text-align:center}
.empty h2{margin:0 0 8px;font-size:26px;letter-spacing:.5px}
.empty p{margin:0 auto 22px;max-width:560px;color:var(--muted);font-size:14px}
.chips{display:flex;flex-wrap:wrap;gap:9px;justify-content:center}
.chip{
  padding:9px 14px;border:1px solid var(--line);border-radius:20px;background:#fff;
  font-size:13px;color:#334155;transition:.15s;
}
.chip:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}
.msg{max-width:820px;margin:0 auto 22px;display:flex;gap:12px}
.msg .who{
  width:30px;height:30px;flex:none;border-radius:9px;display:grid;place-items:center;
  font-size:13px;font-weight:600;
}
.msg.user .who{background:#e2e8f0;color:#475569}
.msg.bot .who{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
.bubble{min-width:0;flex:1}
.msg.user .bubble{
  background:var(--user-bub);color:#fff;padding:11px 15px;border-radius:var(--radius) 4px var(--radius) var(--radius);
  white-space:pre-wrap;word-break:break-word;align-self:flex-start;
}
.msg.user{flex-direction:row-reverse}
.msg.user .bubble{flex:0 1 auto;max-width:82%}
.msg.bot .bubble{
  background:var(--panel);border:1px solid var(--line);border-radius:4px var(--radius) var(--radius) var(--radius);
  padding:14px 18px;box-shadow:0 1px 2px #0f172a08;
}
.att-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:7px;justify-content:flex-end}
.att-chip{font-size:11.5px;background:#ffffff2e;border:1px solid #ffffff40;color:#fff;padding:2px 8px;border-radius:12px}
.msg.bot .att-chip{background:var(--brand-soft);border-color:#a5f3fc;color:#0e7490}

/* markdown */
.md>*:first-child{margin-top:0}
.md>*:last-child{margin-bottom:0}
.md h1,.md h2,.md h3{font-size:15.5px;margin:16px 0 8px;font-weight:700}
.md p{margin:9px 0}
.md ul,.md ol{margin:8px 0;padding-left:22px}
.md li{margin:3px 0}
.md code{font-family:var(--mono);font-size:13px;background:#f1f5f9;padding:1.5px 5px;border-radius:5px}
.md pre{background:#0f172a;color:#e2e8f0;padding:13px 15px;border-radius:10px;overflow-x:auto;margin:10px 0}
.md pre code{background:none;color:inherit;padding:0;font-size:12.8px;line-height:1.6}
.md table{border-collapse:collapse;width:100%;margin:11px 0;font-size:13.5px;display:block;overflow-x:auto}
.md th,.md td{border:1px solid var(--line);padding:7px 10px;text-align:left}
.md th{background:#f8fafc;font-weight:600}
.md blockquote{margin:10px 0;padding:6px 14px;border-left:3px solid var(--brand);background:var(--brand-soft);border-radius:0 8px 8px 0}
.md hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.md a{color:var(--brand)}
.cursor::after{content:"▍";animation:blink 1s steps(2) infinite;color:var(--brand)}
@keyframes blink{50%{opacity:0}}

/* ---------- 输入区 ---------- */
.composer-wrap{padding:8px 20px 14px;background:linear-gradient(transparent,var(--bg) 22%)}
.attach-bar{max-width:820px;margin:0 auto 8px;display:flex;flex-wrap:wrap;gap:7px}
.att-pill{
  display:flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:6px 10px;font-size:12.5px;max-width:260px;
}
.att-pill b{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-pill i{font-style:normal;color:var(--muted);font-size:11.5px;flex:none}
.att-pill .x{color:var(--muted);padding:0 2px}
.att-pill .x:hover{color:#dc2626}
.composer{
  max-width:820px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;
  background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:8px 8px 8px 10px;
  box-shadow:0 6px 24px -16px #0f172a55;transition:border-color .15s,box-shadow .15s;
}
.composer:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px #0e749018}
.composer textarea{
  flex:1;border:none;outline:none;resize:none;padding:7px 2px;max-height:190px;
  background:transparent;line-height:1.6;
}
.composer .icon-btn{color:var(--muted);font-size:16px;padding:7px}
.composer .icon-btn:hover{background:#0f172a0d;color:var(--brand)}
.send{
  width:34px;height:34px;flex:none;border-radius:10px;color:#fff;font-size:17px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.send:disabled{opacity:.4;cursor:default}
.foot-note{max-width:820px;margin:7px auto 0;text-align:center;font-size:11.5px;color:var(--muted)}

/* ---------- 抽屉 ---------- */
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(400px,92vw);background:var(--panel);
  border-left:1px solid var(--line);box-shadow:-20px 0 50px -30px #0f172a66;
  display:flex;flex-direction:column;z-index:40;
}
.drawer-head{display:flex;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line)}
.drawer-head h3{margin:0;font-size:15px;flex:1}
.drawer-head .icon-btn{color:var(--muted)}
.drawer-body{flex:1;overflow-y:auto;padding:14px 16px}
.drawer-body .tip{font-size:12.5px;color:var(--muted);margin:0 0 12px;line-height:1.6}
.item{
  display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--line);
  border-radius:11px;margin-bottom:8px;font-size:13.5px;background:#fff;
}
.item .k{
  font-size:10.5px;padding:1px 7px;border-radius:20px;background:var(--brand-soft);
  color:var(--brand);flex:none;margin-top:3px;
}
.item .c{flex:1;min-width:0;word-break:break-word}
.item .c small{display:block;color:var(--muted);font-size:11.5px;margin-top:3px}
.item .rep{flex:none;font-size:15px;padding:0 6px;opacity:.8}
.item .rep:hover{opacity:1;transform:scale(1.1)}
.item .x{color:#cbd5e1;flex:none}
.item .x:hover{color:#dc2626}
.drawer-body .add-row{display:flex;gap:8px;margin-bottom:14px}
.drawer-body .add-row input{flex:1;padding:9px 11px;border:1px solid var(--line);border-radius:9px}
.drawer-body .add-row input:focus{outline:none;border-color:var(--brand)}
.drawer-body .add-row button{padding:0 14px;border-radius:9px;background:var(--brand);color:#fff;font-size:13px}
.mask{position:fixed;inset:0;background:#0f172a4d;z-index:30}
.empty-tip{text-align:center;color:var(--muted);font-size:13px;padding:30px 10px}

.toast{
  position:fixed;left:50%;bottom:96px;transform:translateX(-50%);z-index:60;
  background:#0f172aef;color:#fff;padding:10px 18px;border-radius:10px;font-size:13.5px;
  box-shadow:0 10px 30px -12px #000;max-width:80vw;
}

/* ---------- 响应式 ---------- */
.only-mobile{display:none}
@media(max-width:820px){
  .only-mobile{display:block}
  .side{
    position:fixed;left:0;top:0;bottom:0;z-index:50;transform:translateX(-100%);
    transition:transform .22s ease;box-shadow:10px 0 40px -20px #000;
  }
  .side.open{transform:none}
  .stream{padding:18px 12px 6px}
  .composer-wrap{padding:6px 12px 12px}
  .msg{gap:9px}
  .msg.user .bubble{max-width:88%}
}

/* 报告抬头设置 */
.lh-box { display: flex; flex-direction: column; gap: 10px; }
.lh-logo {
  height: 84px; border: 1px dashed var(--line, #d6dbe3); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: #fafbfc; overflow: hidden;
}
.lh-logo img { max-height: 68px; max-width: 90%; object-fit: contain; }
.lh-logo span { color: #98a2b3; font-size: 13px; }
.add-row button.ghost { background: #fff; color: #64748b; border: 1px solid #d6dbe3; }

/* 层面示意图 */
.lay-toggle {
  display: flex; align-items: center; gap: 6px; margin: 4px 0 12px;
  font-size: 13px; color: #334155; cursor: pointer;
}
.lay-toggle em { color: #94a3b8; font-style: normal; font-size: 12px; }
.lay-item { margin-bottom: 16px; }
.lay-item.hidden { display: none; }
.lay-h { display: flex; align-items: baseline; gap: 8px; margin-bottom: 4px; }
.lay-h b { font-size: 13px; color: #0f172a; }
.lay-h small { font-size: 11px; color: #94a3b8; }
.lay-img {
  min-height: 60px; border-radius: 8px; overflow: hidden; background: #0e3620;
  display: flex; align-items: center; justify-content: center;
}
.lay-img img { width: 100%; display: block; }
.lay-wait { color: #cbd5e1; font-size: 12px; padding: 24px 0; }
.item .pic { background: none; border: 0; cursor: pointer; font-size: 15px; }

/* 层面图放大查看 */
.lay-img img { cursor: zoom-in; }
.zoom-mask {
  position: fixed; inset: 0; z-index: 999; background: rgba(9, 14, 22, .93);
  display: flex; flex-direction: column;
}
.zoom-bar {
  display: flex; align-items: center; gap: 12px; padding: 12px 18px;
  color: #e2e8f0; font-size: 14px; flex: 0 0 auto;
}
.zoom-bar b { font-weight: 600; }
.zoom-tip { color: #94a3b8; font-size: 12px; }
.zoom-x {
  margin-left: auto; background: none; border: 0; color: #cbd5e1;
  font-size: 18px; cursor: pointer; line-height: 1;
}
.zoom-stage {
  flex: 1; display: flex; align-items: center; justify-content: center;
  overflow: hidden; touch-action: none;
}
.zoom-stage img {
  max-width: 96%; max-height: 100%; object-fit: contain;
  transform-origin: center center; cursor: grab; user-select: none;
  transition: transform .05s linear;
}
.zoom-stage img:active { cursor: grabbing; }