/* Buy and Go — customer care assistant. Dark sci-fi, high contrast, minimal. */
:root{
  --bg:#070912;
  --panel:rgba(16,20,38,.72);
  --panel-2:rgba(12,16,32,.86);
  --line:#2a2f55;
  --line-soft:#1d2244;
  --ink:#dce4f0;
  --ink-dim:#93a0bd;
  --cyan:#4fd6e8;
  --blue:#5b8cff;
  --violet:#9b6bff;
  --bot-bubble:rgba(28,36,66,.78);
  --user-bubble:linear-gradient(135deg,#1e5b72,#25407a);
  --danger:#ff6b8a;
  --ok:#48e0a0;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  display:flex;justify-content:center;
}
.bg-grid{
  position:fixed;inset:0;pointer-events:none;opacity:.30;
  background-image:linear-gradient(rgba(90,120,255,.10) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(90,120,255,.10) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse at 50% 0%,#000 15%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 0%,#000 15%,transparent 78%);
}
.bg-glow{
  position:fixed;left:50%;top:-38vh;width:140vw;height:90vh;transform:translateX(-50%);
  background:radial-gradient(circle at 50% 50%,rgba(79,214,232,.16),rgba(91,140,255,.10) 38%,transparent 70%);
  filter:blur(30px);pointer-events:none;
}
.shell{
  position:relative;width:100%;max-width:860px;display:flex;flex-direction:column;
  height:100dvh;padding:18px 16px 14px;gap:12px;
}
/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 16px;border:1px solid var(--line);border-radius:16px;
  background:var(--panel);backdrop-filter:blur(14px);
  box-shadow:0 0 0 1px rgba(79,214,232,.05),0 10px 40px rgba(0,0,0,.45);
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.mark{
  width:44px;height:44px;flex:none;border-radius:12px;display:grid;place-items:center;
  font-weight:800;letter-spacing:.5px;color:#04121a;
  background:linear-gradient(135deg,var(--cyan),var(--blue) 70%);
  box-shadow:0 0 18px rgba(79,214,232,.45);
}
.brand-text{min-width:0}
.brand-text h1{margin:0;font-size:16.5px;font-weight:700;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-text h1 span{color:var(--cyan);font-weight:600}
.status{margin:2px 0 0;font-size:12.5px;color:var(--ink-dim);display:flex;align-items:center;gap:6px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok)}
.ghost-btn{
  flex:none;padding:8px 13px;border-radius:10px;cursor:pointer;font-size:13px;font-weight:600;
  color:var(--cyan);background:rgba(79,214,232,.07);border:1px solid rgba(79,214,232,.35);
  transition:.18s;
}
.ghost-btn:hover{background:rgba(79,214,232,.16);box-shadow:0 0 16px rgba(79,214,232,.25)}
/* chat area */
.chat{
  flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:16px;padding:16px;
  border:1px solid var(--line-soft);border-radius:16px;background:var(--panel-2);
  scrollbar-width:thin;scrollbar-color:#2b3766 transparent;
}
.chat::-webkit-scrollbar{width:8px}
.chat::-webkit-scrollbar-thumb{background:#2b3766;border-radius:8px}
.msg{display:flex;flex-direction:column;gap:6px;max-width:88%}
.msg.user{align-self:flex-end;align-items:flex-end}
.msg.bot{align-self:flex-start}
.who{font-size:11.5px;letter-spacing:.6px;text-transform:uppercase;color:var(--ink-dim)}
.bubble{
  padding:11px 14px;border-radius:14px;border:1px solid var(--line);
  background:var(--bot-bubble);backdrop-filter:blur(6px);
  animation:rise .26s ease-out;
}
.msg.user .bubble{border-color:rgba(91,140,255,.55);background:var(--user-bubble);border-bottom-right-radius:5px}
.msg.bot .bubble{border-bottom-left-radius:5px}
.bubble p{margin:0 0 8px}
.bubble p:last-child{margin-bottom:0}
.bubble ul{margin:6px 0 0;padding-left:20px}
.bubble li{margin:3px 0}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.srcs{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.src{
  font-size:11px;padding:3px 9px;border-radius:20px;color:var(--cyan);
  background:rgba(79,214,232,.08);border:1px solid rgba(79,214,232,.28);
}
/* inference trace shown under an answer */
.infer{
  margin-top:9px;padding:10px 12px;border-radius:11px;
  background:rgba(155,107,255,.06);border:1px solid rgba(155,107,255,.3);
}
.infer-head{font-size:11.5px;letter-spacing:.4px;color:var(--violet);font-weight:600;margin-bottom:6px}
.src.fact{color:var(--violet);background:rgba(155,107,255,.10);border-color:rgba(155,107,255,.35)}
.infer summary{cursor:pointer;font-size:12px;color:var(--ink-dim);margin-top:7px}
.infer ul{margin:6px 0 0;padding-left:18px;font-size:12px;color:var(--ink-dim)}
.infer li{margin:3px 0}
.typing span{
  display:inline-block;width:6px;height:6px;margin-right:3px;border-radius:50%;
  background:var(--cyan);opacity:.35;animation:blink 1.1s infinite;
}
.typing span:nth-child(2){animation-delay:.16s}
.typing span:nth-child(3){animation-delay:.32s}
@keyframes blink{0%,60%,100%{opacity:.25;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.handover{
  margin-top:9px;padding:9px 12px;border-radius:10px;font-size:13px;
  color:#ffe6ec;background:rgba(255,107,138,.10);border:1px solid rgba(255,107,138,.38);
}
.err{color:var(--danger);font-size:13.5px}
/* suggestion chips */
.chips{display:flex;gap:8px;flex-wrap:wrap;max-height:96px;overflow:hidden}
.chip{
  font-size:12.5px;padding:7px 12px;border-radius:20px;cursor:pointer;color:var(--ink);
  background:rgba(155,107,255,.08);border:1px solid rgba(155,107,255,.3);transition:.16s;
}
.chip:hover{background:rgba(155,107,255,.18);border-color:rgba(155,107,255,.55)}
/* composer */
.composer{display:flex;gap:10px;align-items:center}
#input{
  flex:1;padding:13px 15px;border-radius:13px;font-size:15px;font-family:inherit;
  color:var(--ink);background:rgba(14,18,36,.9);border:1px solid var(--line);outline:none;
}
#input::placeholder{color:#6d7899}
#input:focus{border-color:rgba(79,214,232,.6);box-shadow:0 0 0 3px rgba(79,214,232,.10)}
.send{
  width:47px;height:47px;flex:none;border-radius:13px;cursor:pointer;color:#04121a;
  background:linear-gradient(135deg,var(--cyan),var(--blue));border:0;
  display:grid;place-items:center;transition:.18s;
}
.send:hover{box-shadow:0 0 20px rgba(79,214,232,.5)}
.send:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.foot{margin:0;font-size:11.5px;color:#687394;text-align:center}
.foot a{color:var(--ink-dim)}
@media(max-width:560px){
  .shell{padding:10px 10px 8px}
  .msg{max-width:94%}
  .brand-text h1{font-size:15px}
  .ghost-btn{padding:7px 10px;font-size:12px}
}