/* ===== 数字电路大脑 · 主界面 ===== */
:root{
  --bg:#0f1226;
  --bg2:#171a35;
  --card:#1e2347;
  --card2:#262c57;
  --ink:#eef1ff;
  --muted:#9aa3d0;
  --line:#39407a;
  --accent:#7c8bff;
  --accent2:#43e0c4;
  --good:#39d98a;
  --warn:#ffb454;
  --bad:#ff6b8b;
  --gold:#ffd166;
  --radius:18px;
  --shadow:0 12px 40px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  background:radial-gradient(1200px 600px at 20% -10%,#2a2f63 0,transparent 60%),
             radial-gradient(900px 500px at 100% 0,#1c2c5e 0,transparent 55%),
             var(--bg);
  color:var(--ink);
  min-height:100vh;
  line-height:1.6;
}
.wrap{max-width:1480px;margin:0 auto;padding:18px 18px 60px}

/* ---------- 顶部栏 ---------- */
header.topbar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  background:linear-gradient(135deg,var(--card),var(--card2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 18px;box-shadow:var(--shadow);margin-bottom:16px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand .logo{font-size:30px;filter:drop-shadow(0 0 10px var(--accent))}
.brand .t1{font-size:19px}
.brand .t2{font-size:12px;color:var(--muted);font-weight:400}
.xp{flex:1;min-width:220px}
.xp .bar{height:12px;background:#0c0f24;border-radius:99px;overflow:hidden;border:1px solid var(--line)}
.xp .bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .6s ease}
.xp .lab{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:4px}
.xp .lab>span:last-child{color:var(--gold);font-weight:800;font-size:13px}
.xp .lab2{font-size:11px;color:var(--muted);margin-top:4px}
.btn{
  border:none;cursor:pointer;border-radius:12px;padding:10px 16px;font-weight:700;font-size:14px;
  background:linear-gradient(135deg,var(--accent),#5b6cff);color:#fff;transition:.15s;
  box-shadow:0 6px 18px rgba(124,139,255,.35);font-family:inherit;
}
.btn:hover{transform:translateY(-1px);filter:brightness(1.07)}
.btn.ghost{background:#222a55;color:var(--ink);box-shadow:none;border:1px solid var(--line)}
.btn.small{padding:7px 12px;font-size:13px;border-radius:10px}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}

/* ---------- 主区域布局 ---------- */
.main{display:flex;gap:16px;align-items:flex-start}
.stage{flex:1;min-width:0}
.map-scroll{
  overflow:auto;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(8,10,28,.55);box-shadow:var(--shadow);
}
#brain{display:block;width:100%;height:auto;min-width:880px}

/* ---------- 图例 ---------- */
.legend{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  margin-top:10px;font-size:12px;color:var(--muted);
  padding:8px 14px;border:1px solid var(--line);border-radius:12px;
  background:rgba(14,17,40,.6);
}
.legend .lg{display:flex;align-items:center;gap:5px}
.legend .tip{margin-left:auto;color:var(--accent2)}
.dot{width:12px;height:12px;border-radius:99px;display:inline-block}
.d-todo{background:var(--card2);border:2px solid var(--line)}
.d-doing{background:rgba(67,224,196,.2);border:2px solid var(--accent2)}
.d-done{background:rgba(255,209,102,.2);border:2px solid var(--gold)}
.d-reco{background:rgba(255,107,139,.15);border:2px dashed var(--gold);animation:legendPulse 1.4s infinite}
@keyframes legendPulse{50%{border-color:var(--accent2)}}
.ln{width:26px;height:0;border-top:3px solid;display:inline-block;border-radius:2px}
.l-pre{border-color:var(--warn)}
.l-rel{border-color:#5b6cff;border-top-style:dashed}

/* ---------- SVG 大脑 ---------- */
/* 突触（中央→分支） */
.syn{fill:none;stroke:var(--line);stroke-width:2.5;opacity:.85}
.syn.doing{stroke:var(--accent2);stroke-dasharray:7 6;animation:flow 1s linear infinite;filter:drop-shadow(0 0 4px rgba(67,224,196,.6))}
.syn.done{stroke:var(--gold);stroke-width:3;filter:drop-shadow(0 0 5px rgba(255,209,102,.55))}
@keyframes flow{to{stroke-dashoffset:-26}}
/* 问题间连线 */
.qedge{fill:none;stroke-width:2.5;opacity:.55;transition:opacity .2s}
.qedge.pre{stroke:var(--warn)}
.qedge.rel{stroke:#5b6cff;stroke-dasharray:5 5}
.qedge.hi{opacity:1;stroke-width:3;filter:drop-shadow(0 0 4px rgba(255,180,84,.5))}
.qedge.dim{opacity:.12}
/* 分支节点 */
.qnode{cursor:pointer;transition:opacity .2s}
.qnode.dim{opacity:.3}
.qnode .halo{fill:none;stroke:transparent;stroke-width:2.5}
.qnode.reco .halo{stroke:var(--gold);stroke-dasharray:4 4;animation:haloPulse 1.5s infinite}
@keyframes haloPulse{0%,100%{stroke-width:2;opacity:.9}50%{stroke-width:5;opacity:.35}}
.qnode .body{
  fill:url(#gNode);stroke:var(--line);stroke-width:2.5;
  transition:stroke .2s,filter .2s;
}
.qnode:hover .body{stroke:var(--accent);filter:url(#glow)}
.qnode.sel .body{stroke:var(--accent);stroke-width:3.5;filter:url(#glow)}
.qnode.doing .body{stroke:var(--accent2);filter:drop-shadow(0 0 8px rgba(67,224,196,.7))}
.qnode.done .body{stroke:var(--gold);fill:url(#gNodeDone);filter:drop-shadow(0 0 8px rgba(255,209,102,.6))}
.qnode .icon{font-size:26px;text-anchor:middle;pointer-events:none}
.qnode .qnum{font-size:11px;font-weight:800;text-anchor:middle;fill:var(--muted);pointer-events:none}
.qnode .name{font-size:15px;font-weight:800;text-anchor:middle;fill:var(--ink);pointer-events:none}
.qnode .sub{font-size:11px;text-anchor:middle;fill:var(--muted);pointer-events:none}
.qnode .numbg{fill:#0c0f24;stroke:var(--line)}
.qnode .numtx{font-size:11px;font-weight:800;text-anchor:middle;fill:var(--accent2)}
.qnode.done .numtx{fill:var(--gold)}
/* 中央大脑 */
.center{cursor:pointer}
.center .ring-bg{fill:none;stroke:#0c0f24;stroke-width:9}
.center .ring{fill:none;stroke:url(#gRing);stroke-width:9;stroke-linecap:round;transition:stroke-dasharray .8s ease}
.center .pulse{fill:none;stroke:var(--accent);stroke-width:1.5;opacity:0;transform-box:fill-box;transform-origin:center;animation:cpulse 3s linear infinite}
.center .pulse.p2{animation-delay:1.5s}
@keyframes cpulse{0%{transform:scale(.92);opacity:.45}100%{transform:scale(1.5);opacity:0}}
.center .chip{fill:url(#gChip);stroke:var(--accent);stroke-width:2;filter:drop-shadow(0 0 14px rgba(124,139,255,.45))}
.center .chip-in{fill:none;stroke:rgba(124,139,255,.35);stroke-width:1}
.center .pin{fill:var(--accent);opacity:.75}
.center .c1{font-size:19px;font-weight:800;text-anchor:middle;fill:var(--ink)}
.center .c2{font-size:15px;font-weight:700;text-anchor:middle;fill:var(--accent2)}
.center .pct{font-size:13px;font-weight:800;text-anchor:middle;fill:var(--gold)}
.center:hover .chip{stroke:var(--accent2)}

/* ---------- 侧栏 ---------- */
.side{
  width:400px;flex-shrink:0;max-height:calc(100vh - 140px);overflow-y:auto;
  background:linear-gradient(160deg,var(--card),var(--card2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow);
}
.side::-webkit-scrollbar{width:8px}
.side::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}
.q-head{display:flex;gap:12px;align-items:flex-start}
.q-ic{
  width:52px;height:52px;border-radius:14px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:28px;
  background:rgba(124,139,255,.12);border:1px solid var(--line);
}
.q-head h2{margin:0;font-size:18px}
.q-text{margin:2px 0 0;font-size:13px;color:var(--muted)}
.status-row{display:flex;gap:8px;margin:14px 0 10px}
.status-row .sbtn{
  flex:1;border:1px solid var(--line);background:#141836;color:var(--muted);
  border-radius:10px;padding:8px 4px;font-size:13px;font-weight:700;cursor:pointer;transition:.15s;font-family:inherit;
}
.status-row .sbtn:hover{border-color:var(--accent)}
.status-row .sbtn.on-todo{background:#222a55;color:var(--ink);border-color:var(--accent)}
.status-row .sbtn.on-doing{background:rgba(67,224,196,.15);color:var(--accent2);border-color:var(--accent2)}
.status-row .sbtn.on-done{background:rgba(255,209,102,.15);color:var(--gold);border-color:var(--gold)}
.meta-row{font-size:13px;color:var(--muted);margin:8px 0}
.meta-row b{color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 2px}
.chip-q{
  font-size:12px;font-weight:700;padding:3px 10px;border-radius:99px;cursor:pointer;
  background:rgba(124,139,255,.14);border:1px solid var(--accent);color:var(--accent);
}
.chip-q:hover{background:rgba(124,139,255,.3)}
.chip-q.done{background:rgba(255,209,102,.12);border-color:var(--gold);color:var(--gold)}
/* 折叠面板 */
details.acc{
  border:1px solid var(--line);border-radius:12px;margin:10px 0;
  background:rgba(12,15,36,.45);overflow:hidden;
}
details.acc>summary{
  cursor:pointer;padding:10px 14px;font-size:14px;font-weight:800;color:var(--accent2);
  list-style:none;display:flex;align-items:center;gap:6px;user-select:none;
}
details.acc>summary::-webkit-details-marker{display:none}
details.acc>summary::after{content:"▾";margin-left:auto;color:var(--muted);transition:transform .2s}
details.acc[open]>summary::after{transform:rotate(180deg)}
details.acc .acc-body{padding:4px 14px 12px}
.unit-h{font-size:12px;font-weight:800;color:var(--accent);margin:10px 0 4px}
details.kp{border-top:1px dashed rgba(255,255,255,.08)}
details.kp>summary{
  cursor:pointer;padding:7px 2px;font-size:13px;list-style:none;
  display:flex;align-items:center;gap:6px;flex-wrap:wrap;
}
details.kp>summary::-webkit-details-marker{display:none}
details.kp>summary::after{content:"▸";margin-left:auto;color:var(--muted)}
details.kp[open]>summary::after{content:"▾"}
details.kp .kpx{
  font-size:12.5px;color:var(--muted);padding:2px 6px 10px;
  border-left:2px solid var(--line);margin:0 0 4px 4px;white-space:pre-wrap;
}
details.kp .kpx.none{color:var(--bad);opacity:.75}
.tag{font-size:11px;padding:1px 8px;border-radius:99px;font-weight:800;white-space:nowrap}
.tag.key{background:var(--gold);color:#3a2c00}
.tag.diff{background:var(--bad);color:#3a0010}
.tag.shared{background:rgba(67,224,196,.18);color:var(--accent2);border:1px solid rgba(67,224,196,.4)}
.tag.ghost{background:#222a55;color:var(--muted);border:1px dashed var(--line)}
.tag.warn{background:rgba(255,180,84,.15);color:var(--warn);border:1px solid rgba(255,180,84,.4)}
/* 回溯 */
.bt-depth{font-size:12px;font-weight:800;color:var(--warn);margin:10px 0 4px}
.bt-item{font-size:13px;padding:5px 2px;border-top:1px dashed rgba(255,255,255,.07);display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.bt-item .bt-name{font-weight:700}
.bt-item .bt-via{font-size:12px;color:var(--muted)}
.bt-item .bt-u{font-size:11px;color:var(--accent)}
.callout{
  background:rgba(67,224,196,.08);border:1px solid rgba(67,224,196,.35);
  border-radius:12px;padding:10px 14px;margin:12px 0;font-size:13px;
}
.callout.warn{background:rgba(255,180,84,.08);border-color:rgba(255,180,84,.4)}
.callout b{color:var(--accent2)}
.callout.warn b{color:var(--warn)}
/* 总览 */
.ov-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:12px 0}
.ov-stat{
  background:rgba(12,15,36,.5);border:1px solid var(--line);border-radius:12px;
  padding:10px 6px;text-align:center;
}
.ov-stat .v{font-size:20px;font-weight:800;color:var(--accent2)}
.ov-stat .k{font-size:11px;color:var(--muted)}
.ov-list{font-size:13px}
.ov-list .row{display:flex;justify-content:space-between;gap:8px;padding:6px 2px;border-top:1px dashed rgba(255,255,255,.08)}
.ov-list .row:first-child{border-top:none}
.muted{color:var(--muted)}
.go-row{display:flex;gap:8px;margin:12px 0 4px}
.go-row .btn{flex:1}

/* ---------- 悬浮提示 ---------- */
.tooltip{
  position:fixed;z-index:50;pointer-events:none;display:none;
  max-width:320px;background:rgba(12,15,36,.95);border:1px solid var(--accent);
  border-radius:12px;padding:10px 14px;font-size:12.5px;box-shadow:var(--shadow);
}
.tooltip b{color:var(--accent2)}
.tooltip .tt-q{margin:4px 0 6px;color:var(--ink)}
.tooltip .tr{color:var(--muted);font-size:12px}

/* ---------- AI 助手 ---------- */
#aiFab{
  position:fixed;right:26px;bottom:26px;z-index:60;
  width:58px;height:58px;border-radius:50%;border:none;cursor:pointer;
  font-size:26px;background:linear-gradient(135deg,var(--accent),#5b6cff);
  box-shadow:0 8px 26px rgba(124,139,255,.5);transition:.15s;
}
#aiFab:hover{transform:scale(1.08)}
#aiFab.on{background:linear-gradient(135deg,var(--accent2),#2ea88e)}

/* ---------- AI 聊天面板 ---------- */
.ai-panel{
  position:fixed;right:26px;bottom:96px;z-index:61;
  width:400px;max-width:calc(100vw - 32px);height:560px;max-height:calc(100vh - 130px);
  display:flex;flex-direction:column;
  background:linear-gradient(165deg,var(--card),var(--card2));
  border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);
  overflow:hidden;animation:aiIn .18s ease;
}
@keyframes aiIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.ai-head{
  display:flex;align-items:center;gap:8px;padding:12px 14px;
  border-bottom:1px solid var(--line);background:rgba(12,15,36,.5);flex-shrink:0;
}
.ai-title{font-weight:800;font-size:14px}
.ai-model{
  font-size:11px;font-weight:700;padding:2px 9px;border-radius:99px;cursor:pointer;
  background:rgba(255,180,84,.12);color:var(--warn);border:1px solid rgba(255,180,84,.4);
  margin-right:auto;white-space:nowrap;max-width:150px;overflow:hidden;text-overflow:ellipsis;
}
.ai-model.ok{background:rgba(67,224,196,.12);color:var(--accent2);border-color:rgba(67,224,196,.4)}
.ai-hbtn{
  border:none;background:transparent;color:var(--muted);font-size:14px;cursor:pointer;
  width:28px;height:28px;border-radius:8px;transition:.15s;font-family:inherit;
}
.ai-hbtn:hover{background:rgba(124,139,255,.15);color:var(--ink)}
.ai-ctx{
  font-size:11.5px;color:var(--accent2);padding:6px 14px;flex-shrink:0;
  background:rgba(67,224,196,.06);border-bottom:1px solid var(--line);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.ai-msgs{flex:1;overflow-y:auto;padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.ai-msgs::-webkit-scrollbar{width:6px}
.ai-msgs::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}
.msg{max-width:88%;font-size:13px;line-height:1.65;border-radius:12px;padding:8px 12px;word-break:break-word}
.msg.user{
  align-self:flex-end;background:linear-gradient(135deg,var(--accent),#5b6cff);
  color:#fff;border-bottom-right-radius:4px;white-space:pre-wrap;
}
.msg.bot{
  align-self:flex-start;background:rgba(12,15,36,.6);border:1px solid var(--line);
  border-bottom-left-radius:4px;
}
.msg.bot .cursor{display:inline-block;width:7px;height:14px;background:var(--accent2);
  vertical-align:-2px;margin-left:2px;animation:blink .8s infinite;border-radius:2px}
@keyframes blink{50%{opacity:0}}
.msg.bot.err{border-color:rgba(255,107,139,.5);color:#ffc9d4}
.msg pre{
  background:#0c0f24;border:1px solid var(--line);border-radius:8px;
  padding:8px 10px;overflow-x:auto;font-size:12px;margin:6px 0;font-family:Consolas,Menlo,monospace;
}
.msg code{background:#0c0f24;padding:1px 5px;border-radius:5px;font-family:Consolas,Menlo,monospace;font-size:12px}
.msg pre code{background:transparent;padding:0}
.msg b{color:var(--accent2)}
.msg.user b{color:#fff}
.ai-quick{
  display:flex;gap:6px;flex-wrap:wrap;padding:6px 12px;flex-shrink:0;
  border-top:1px solid var(--line);background:rgba(12,15,36,.3);
}
.ai-qbtn{
  font-size:11.5px;font-weight:700;padding:4px 10px;border-radius:99px;cursor:pointer;
  background:rgba(124,139,255,.12);border:1px solid var(--accent);color:var(--accent);
  font-family:inherit;transition:.15s;
}
.ai-qbtn:hover{background:rgba(124,139,255,.28)}
.ai-input{display:flex;gap:8px;align-items:flex-end;padding:10px 12px;flex-shrink:0;border-top:1px solid var(--line)}
.ai-input textarea{
  flex:1;resize:none;background:#0c0f24;color:var(--ink);border:1px solid var(--line);
  border-radius:10px;padding:8px 10px;font-size:13px;font-family:inherit;line-height:1.5;
  max-height:110px;outline:none;
}
.ai-input textarea:focus{border-color:var(--accent)}
.ai-input .btn:disabled{opacity:.4}
/* 设置层 */
.ai-settings{
  position:absolute;inset:0;z-index:5;overflow-y:auto;
  background:linear-gradient(165deg,#181c3e,#1b2047);padding:16px 18px 20px;
}
.ai-settings h3{margin:0 0 12px;font-size:15px}
.ai-settings label{display:block;font-size:12px;color:var(--muted);font-weight:700;margin:10px 0 4px}
.ai-settings input,.ai-settings select{
  width:100%;background:#0c0f24;color:var(--ink);border:1px solid var(--line);
  border-radius:10px;padding:8px 10px;font-size:13px;font-family:inherit;outline:none;
}
.ai-settings input:focus,.ai-settings select:focus{border-color:var(--accent)}
.ai-tip{font-size:11.5px;color:var(--muted);line-height:1.7;margin:12px 0}
.ai-setbtns{display:flex;gap:8px;justify-content:flex-end}
.ai-test-result{font-size:12px;margin-top:10px;line-height:1.6}
.ai-test-result.ok{color:var(--accent2)}
.ai-test-result.bad{color:var(--bad)}

/* ---------- 响应式 ---------- */
@media (max-width:1150px){
  .main{flex-direction:column}
  .side{width:100%;max-height:none}
}