:root{
  --bg:#0b1220; --bg2:#0f172a; --panel:#111c30; --panel2:#16233c;
  --line:#22304d; --line2:#2c3d5e;
  --txt:#e6edf7; --txt2:#9fb0cc; --muted:#6b7e9e;
  --pri:#38bdf8; --pri2:#6366f1; --ok:#22c55e; --warn:#f59e0b; --err:#f43f5e;
  --r:14px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;height:100%}
body{
  background:radial-gradient(1200px 700px at 15% -10%,#16233c 0%,var(--bg) 60%) fixed;
  color:var(--txt);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
.app{max-width:1080px;margin:0 auto;padding:0 14px 90px;display:flex;flex-direction:column;min-height:100%}

/* topbar */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:12px 4px;background:linear-gradient(180deg,rgba(11,18,32,.97),rgba(11,18,32,.75));
  backdrop-filter:blur(10px)}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.logo{width:38px;height:38px;flex:none}
.brand-txt{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-txt b{font-size:16px;letter-spacing:.3px}
.brand-txt span{font-size:11.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top-right{display:flex;align-items:center;gap:8px}
.chip{display:flex;align-items:center;gap:6px;font-size:12px;padding:5px 10px;border-radius:999px;
  border:1px solid var(--line2);background:var(--panel);color:var(--txt2);white-space:nowrap}
.chip .dot{width:7px;height:7px;border-radius:50%;background:var(--warn)}
.chip-demo .dot{background:var(--warn)}
.chip-live .dot{background:var(--ok);box-shadow:0 0 0 3px rgba(34,197,94,.15)}
.chip-dead .dot{background:var(--err)}
.icon-btn{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--line2);
  background:var(--panel);color:var(--txt2);cursor:pointer}
.icon-btn:active{transform:scale(.95)}

/* tabs */
.tabs{position:sticky;top:62px;z-index:19;display:flex;gap:6px;overflow-x:auto;padding:6px 2px 10px;
  scrollbar-width:none;background:linear-gradient(180deg,rgba(11,18,32,.9),rgba(11,18,32,0))}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:none;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--panel);
  color:var(--txt2);font-size:13.5px;cursor:pointer;transition:.15s}
.tab.active{background:linear-gradient(135deg,var(--pri),var(--pri2));color:#04121f;border-color:transparent;font-weight:600}

/* pages */
.page{display:none;animation:fade .25s ease}
.page.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* hero */
.hero{padding:16px 4px 8px}
.hero h1{font-size:26px;margin:0 0 8px;line-height:1.3;
  background:linear-gradient(120deg,#e6edf7,#67e8f9 60%,#a5b4fc);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--txt2);margin:0 0 14px;font-size:14px}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap}

.btn{border:1px solid var(--line2);background:var(--panel);color:var(--txt);padding:9px 16px;border-radius:10px;
  font-size:14px;cursor:pointer;transition:.15s}
.btn:active{transform:scale(.98)}
.btn.primary{background:linear-gradient(135deg,var(--pri),var(--pri2));color:#04121f;border-color:transparent;font-weight:600}
.btn.ghost{background:transparent}
.btn.tiny{padding:5px 10px;font-size:12.5px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:12px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:12px}
.stat{display:flex;flex-direction:column;gap:2px}
.stat .k{font-size:11.5px;color:var(--muted)}
.stat .v{font-size:16px;font-weight:600}
.stat .s{font-size:11.5px;color:var(--pri)}

/* panel */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:14px;margin:12px 0}
.panel h2{margin:0 0 10px;font-size:15.5px}
.muted{color:var(--muted);font-size:13px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.mini{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:12px}
.mini b{font-size:14px}

/* topo */
.topo{overflow-x:auto;border-radius:12px;background:var(--bg2);border:1px solid var(--line);padding:6px}
.topo-svg{width:100%;min-width:760px;height:auto;display:block}

/* steps */
.steps{margin:0;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:8px}
.steps li{display:flex;gap:10px;align-items:flex-start;background:var(--bg2);border:1px solid var(--line);
  border-radius:10px;padding:10px;font-size:13.5px;color:var(--txt2)}
.steps li b{flex:none;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;font-size:12px;
  background:linear-gradient(135deg,var(--pri),var(--pri2));color:#04121f}
code{background:#0a1120;border:1px solid var(--line);padding:1px 5px;border-radius:5px;font-size:12.5px;color:#7dd3fc}

/* code block */
.code-head{display:flex;align-items:center;justify-content:space-between;background:var(--bg2);
  border:1px solid var(--line);border-bottom:none;border-radius:10px 10px 0 0;padding:6px 10px}
.code-head span{font-size:12px;color:var(--muted)}
.copy{font-size:12px;color:var(--pri);background:transparent;border:1px solid var(--line2);
  border-radius:7px;padding:3px 9px;cursor:pointer}
.code{margin:0;background:#080f1d;border:1px solid var(--line);border-radius:0 0 10px 10px;padding:12px;
  overflow:auto;max-height:340px;font:12.5px/1.65 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#cbd5e1;white-space:pre}

/* chat */
.chat-wrap{display:flex;flex-direction:column;height:calc(100vh - 210px);min-height:420px;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:12px}
.chat-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;
  border-bottom:1px solid var(--line);background:var(--panel2)}
.chat-head b{font-size:14.5px}
.chat-head .sub{display:block;font-size:11.5px;color:var(--muted)}
.chat-tools{display:flex;gap:6px;align-items:center}
.mini-sel{background:var(--bg);color:var(--txt2);border:1px solid var(--line2);border-radius:8px;
  padding:5px 8px;font-size:12.5px;max-width:160px}
.chat-body{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:14px;scroll-behavior:smooth}
.chat-input{display:flex;gap:8px;padding:10px;border-top:1px solid var(--line);background:var(--panel2)}
.chat-input textarea{flex:1;resize:none;background:var(--bg);border:1px solid var(--line2);border-radius:10px;
  color:var(--txt);padding:10px;font:14px/1.5 inherit;outline:none}
.chat-input textarea:focus{border-color:var(--pri)}
.chat-input .btn{flex:none;align-self:stretch;display:grid;place-items:center;padding:0 18px}

.msg{display:flex;gap:10px;max-width:100%}
.msg .avatar{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-size:13px;font-weight:600}
.msg.user{flex-direction:row-reverse}
.msg.user .avatar{background:linear-gradient(135deg,var(--pri),var(--pri2));color:#04121f}
.msg.ai .avatar{background:#1c2b47;color:#7dd3fc;border:1px solid var(--line2)}
.bubble{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px;
  max-width:min(760px,86%);word-break:break-word;white-space:pre-wrap}
.msg.user .bubble{background:linear-gradient(135deg,rgba(56,189,248,.16),rgba(99,102,241,.16));border-color:#2b4a72}
.bubble .meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px;font-size:11.5px;color:var(--muted)}
.refs{margin-top:10px;border-top:1px dashed var(--line2);padding-top:8px}
.refs .rt{font-size:12px;color:var(--muted);margin-bottom:6px}
.ref{background:#0a1222;border:1px solid var(--line);border-radius:9px;padding:8px 10px;margin-bottom:6px}
.ref .rh{display:flex;justify-content:space-between;gap:8px;font-size:12px;color:var(--txt2)}
.ref .rh .score{color:var(--ok);font-variant-numeric:tabular-nums}
.ref .rc{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.55}
.typing:after{content:"▌";animation:blink 1s steps(2) infinite;color:var(--pri)}
@keyframes blink{50%{opacity:0}}
.empty{color:var(--muted);text-align:center;padding:26px 10px;font-size:13.5px}
.empty .eg{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:12px}
.eg-chip{background:var(--bg2);border:1px solid var(--line2);border-radius:999px;padding:6px 12px;
  font-size:12.5px;color:var(--txt2);cursor:pointer}
.eg-chip:active{background:var(--panel2)}

/* settings */
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--bg2);
  border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:12px}
.switch-row b{font-size:14px}
.switch-row .muted{display:block;margin-top:2px}
.switch{position:relative;width:46px;height:26px;flex:none}
.switch input{opacity:0;width:0;height:0}
.switch span{position:absolute;inset:0;background:#2a3category;background:#2a3550;border-radius:999px;transition:.2s}
.switch span:before{content:"";position:absolute;width:20px;height:20px;border-radius:50%;background:#fff;
  left:3px;top:3px;transition:.2s}
.switch input:checked + span{background:linear-gradient(135deg,var(--pri),var(--pri2))}
.switch input:checked + span:before{transform:translateX(20px)}
.form{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.form label{display:flex;flex-direction:column;gap:5px;font-size:12.5px;color:var(--txt2)}
.form input{background:var(--bg);border:1px solid var(--line2);border-radius:9px;color:var(--txt);
  padding:9px 11px;font-size:13.5px;outline:none}
.form input:focus{border-color:var(--pri)}
.row-btns{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}

/* toast */
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);opacity:0;pointer-events:none;
  background:#12203a;border:1px solid var(--line2);color:var(--txt);padding:9px 16px;border-radius:10px;
  font-size:13.5px;transition:.25s;z-index:99;max-width:80vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* compare tables */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#0a1120}
table.cmp{width:100%;border-collapse:collapse;font-size:13px;min-width:640px}
.cmp th,.cmp td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.cmp th{background:#101b30;color:var(--pri);font-size:12.5px;white-space:nowrap}
.cmp tr:last-child td{border-bottom:none}
.cmp td:first-child{color:var(--txt2);white-space:nowrap;font-size:12.5px}
.cmp b{color:var(--txt)}
.cmp .good{color:var(--ok)}
.cmp .mid{color:var(--warn)}
.cmp .bad{color:var(--err)}

/* badges */
.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11px;border:1px solid var(--line2);margin:2px 4px 2px 0;white-space:nowrap}
.badge.rec{background:rgba(56,189,248,.15);border-color:rgba(56,189,248,.5);color:#7dd3fc}
.badge.alt{background:rgba(99,102,241,.15);border-color:rgba(99,102,241,.5);color:#a5b4fc}
.badge.big{background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.45);color:#fcd34d}

/* bar chart */
.bars{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.bar-row{display:grid;grid-template-columns:150px 1fr 74px;gap:10px;align-items:center;font-size:12.5px}
.bar-row .lbl{color:var(--txt2);text-align:right}
.bar-track{background:var(--bg);border:1px solid var(--line);border-radius:6px;height:18px;overflow:hidden}
.bar-fill{height:100%;border-radius:5px;background:linear-gradient(90deg,var(--pri),var(--pri2));min-width:4px}
.bar-row .val{color:var(--txt);font-variant-numeric:tabular-nums}
.bar-note{font-size:11.5px;color:var(--muted);margin-top:8px}

/* combo cards */
.combos{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.combo{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:12px}
.combo h4{margin:0 0 6px;font-size:14px;display:flex;align-items:center;gap:8px}
.combo .chain{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;color:#7dd3fc;
  background:#0a1120;border:1px solid var(--line);border-radius:8px;padding:6px 8px;margin:6px 0 8px;overflow-x:auto;white-space:nowrap}
.combo .fit{font-size:12.5px;color:var(--txt2)}
.combo .meta{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap;font-size:11.5px;color:var(--muted)}

/* data-layer flow svg */
.flow{overflow-x:auto;border-radius:12px;background:var(--bg2);border:1px solid var(--line);padding:6px}
.flow svg{width:100%;min-width:680px;height:auto;display:block}

/* prompt page */
.tricks{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.trick{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:11px}
.trick b{font-size:13.5px}
.trick p{margin:5px 0 0;font-size:12.5px;color:var(--txt2)}
.trick code{font-size:11.5px}
.bad-eg,.good-eg{border-radius:8px;padding:8px 10px;font-size:12.5px;margin-top:6px}
.bad-eg{background:rgba(244,63,94,.08);border:1px solid rgba(244,63,94,.35)}
.good-eg{background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.35)}
.bad-eg .t,.good-eg .t{font-size:11px;display:block;margin-bottom:3px}
.bad-eg .t{color:#fb7185}.good-eg .t{color:#4ade80}

/* faq */
.faq{background:var(--bg2);border:1px solid var(--line);border-radius:10px;margin-bottom:9px;overflow:hidden}
.faq summary{padding:12px;cursor:pointer;font-size:14px;font-weight:600;color:var(--txt);
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--pri);font-size:18px;flex:none;font-weight:400}
.faq[open] summary:after{content:"−"}
.faq[open] summary{border-bottom:1px solid var(--line)}
.faq .a{padding:12px;font-size:13px;color:var(--txt2);line-height:1.75}
.faq .a b,.faq .a strong{color:var(--txt)}
.faq .a p{margin:0 0 8px}
.faq .a .tbl-wrap{margin:8px 0}
.faq .a ul,.faq .a ol{margin:0 0 8px;padding-left:20px}
.faq .a li{margin-bottom:4px}

/* responsive */
@media(max-width:820px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .grid2,.form{grid-template-columns:1fr}
  .hero h1{font-size:22px}
  .chat-wrap{height:calc(100vh - 190px)}
  .bubble{max-width:92%}
  .combos,.tricks{grid-template-columns:1fr}
  .bar-row{grid-template-columns:96px 1fr 60px}
}
@media(max-width:420px){
  .brand-txt span{display:none}
  .code{max-height:260px}
}