/* ============================================================
   06 · 与 AI 共写 — 流 / 会话
   ============================================================ */

.scene--ai{
  background:#08070C;
  color:#DAD5E6;
  --sh-line:rgba(234,229,246,.15);
  --sh-num:#B49BFF;
  --sh-dim:#8B839E;
  --sh-title:#F6F3FC;
  --prose-lead:#F6F3FC;
  --prose-em:#C9B8FF;
  --prose-hl:rgba(168,139,255,.20);
}
.ai-bg{position:absolute;inset:0;z-index:0;overflow:hidden;background:#08070C}
.ai-mesh{position:absolute;border-radius:50%;filter:blur(80px);opacity:.55}
.ai-mesh--a{
  width:48vw;height:48vw;left:-10vw;top:-12vw;
  background:radial-gradient(circle,rgba(104,82,220,.55),transparent 66%);
  animation:meshFloat 24s ease-in-out infinite alternate;
}
.ai-mesh--b{
  width:42vw;height:42vw;right:-8vw;top:24%;
  background:radial-gradient(circle,rgba(38,164,170,.32),transparent 66%);
  animation:meshFloat 30s ease-in-out infinite alternate-reverse;
}
.ai-mesh--c{
  width:34vw;height:34vw;left:28%;bottom:-18vw;
  background:radial-gradient(circle,rgba(196,68,46,.20),transparent 68%);
  animation:meshFloat 26s ease-in-out infinite alternate;
}
@keyframes meshFloat{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(3vw,3vh,0) scale(1.1)}
}
.ai-lines{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(180,170,230,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(180,170,230,.05) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 70% 60% at 60% 40%,#000,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 60% 40%,#000,transparent 80%);
}
.ai-live{display:flex;align-items:center;gap:6px;color:#9BE3C8}
.ai-live i{
  width:5px;height:5px;border-radius:50%;background:#5BE3A8;
  box-shadow:0 0 8px #5BE3A8;animation:livePulse 2s ease-in-out infinite;
}
@keyframes livePulse{50%{opacity:.35;transform:scale(.7)}}

.ai-layout{
  display:grid;
  grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);
  gap:clamp(34px,4.6vw,66px);
  margin-top:clamp(44px,6.4vh,72px);
  align-items:start;
}
.ai-prose{max-width:30em;padding-top:6px}
.ai-tools{
  display:flex;flex-wrap:wrap;gap:7px;
  margin-top:38px;padding-top:20px;
  border-top:1px solid rgba(234,229,246,.14);
}
.ai-tool{
  font-family:var(--f-mono);font-size:8.5px;letter-spacing:.06em;
  color:#9B93AD;border:1px solid rgba(234,229,246,.16);
  padding:4px 9px;border-radius:20px;
}
.ai-tool.on{color:#D9CDFF;border-color:rgba(180,155,255,.45);background:rgba(168,139,255,.10)}

/* ---------- 会话窗 ---------- */
.ai-window{
  position:relative;
  border-radius:14px;
  background:rgba(15,13,22,.78);
  backdrop-filter:blur(20px) saturate(130%);
  -webkit-backdrop-filter:blur(20px) saturate(130%);
  box-shadow:
    0 60px 120px -50px rgba(0,0,0,.9),
    0 0 90px -30px rgba(120,90,220,.35);
  overflow:hidden;
  font-family:var(--f-sans);
}
.ai-window::before{
  content:"";position:absolute;inset:0;border-radius:14px;padding:1px;
  background:linear-gradient(120deg,rgba(180,155,255,.65),rgba(90,200,200,.35) 45%,rgba(255,255,255,.06) 70%,rgba(180,155,255,.4));
  background-size:220% 220%;
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask-composite:exclude;
  animation:borderShift 14s linear infinite;
  pointer-events:none;
  z-index:3;
}
@keyframes borderShift{
  0%{background-position:0% 0%}
  100%{background-position:200% 200%}
}

.ai-bar{
  height:46px;display:flex;align-items:center;gap:9px;
  padding:0 14px;
  border-bottom:1px solid rgba(234,229,246,.10);
  background:rgba(255,255,255,.02);
}
.ai-dot{
  width:7px;height:7px;border-radius:50%;
  background:linear-gradient(135deg,#B49BFF,#5BC8C8);
  box-shadow:0 0 10px rgba(180,155,255,.7);
}
.ai-bar b{font-size:10.5px;font-weight:400;color:#CFC8DC;letter-spacing:.03em}
.ai-models{margin-left:auto;display:flex;gap:2px;padding:2px;background:rgba(255,255,255,.04);border-radius:20px}
.ai-models button{
  font-family:var(--f-mono);font-size:9px;letter-spacing:.02em;
  color:#948CA8;padding:4px 10px;border-radius:20px;
  transition:color .25s,background .25s;
}
.ai-models button:hover{color:#D8D0E8}
.ai-models button.on{
  color:#EDE7FF;
  background:linear-gradient(135deg,rgba(168,139,255,.28),rgba(70,180,180,.16));
  box-shadow:inset 0 0 0 1px rgba(180,155,255,.3);
}

.ai-body{
  padding:20px 18px 12px;
  max-height:356px;overflow:auto;
  scrollbar-width:thin;
  scrollbar-color:rgba(180,155,255,.35) transparent;
}
.ai-body::-webkit-scrollbar{width:6px}
.ai-body::-webkit-scrollbar-thumb{background:rgba(180,155,255,.3);border:0;border-radius:3px}
.ai-msg{display:flex;gap:10px;margin-bottom:18px;align-items:flex-start}
.ai-who{
  flex:none;width:24px;height:24px;border-radius:6px;
  display:grid;place-items:center;
  font-family:var(--f-mono);font-size:8px;color:#B9B0C9;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.09);
  margin-top:2px;
}
.ai-who svg{width:12px;height:12px;stroke:#B49BFF;stroke-width:1.4}
.ai-msg p{
  font-size:13px;line-height:1.92;color:#D4CEDF;
  letter-spacing:.005em;
}
.ai-msg--user{justify-content:flex-end}
.ai-msg--user .ai-who{order:2;background:rgba(255,255,255,.10);color:#EDE7F5}
.ai-msg--user p{
  order:1;max-width:84%;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.07);
  padding:10px 13px;border-radius:10px 2px 10px 10px;
  color:#E6E0F0;font-size:12.5px;
}
.ai-msg--bot{
  display:grid;grid-template-columns:24px minmax(0,1fr);
  column-gap:10px;row-gap:0;align-items:start;
}
.ai-msg--bot .ai-who{grid-column:1;grid-row:1}
.ai-msg--bot p{grid-column:2;grid-row:1;max-width:100%;white-space:pre-wrap;overflow-wrap:break-word}
.ai-trace{grid-column:2;grid-row:2;margin-left:0}
.ai-msg--bot p .hl{color:#DCD0FF;background:rgba(180,155,255,.14);padding:0 2px}
.ai-caret{
  display:inline-block;width:6px;height:12px;
  background:#B49BFF;vertical-align:-1px;margin-left:2px;
  animation:aiBlink 1s steps(1) infinite;
}
@keyframes aiBlink{50%{opacity:0}}

.ai-trace{
  margin-top:14px;
  border-left:1px solid rgba(180,155,255,.24);
  padding-left:12px;
  display:flex;flex-direction:column;gap:2px;
}
.ai-step{
  display:flex;align-items:baseline;gap:8px;
  font-family:var(--f-mono);font-size:9.5px;line-height:1.85;
  color:#8F87A2;
  opacity:0;transform:translateX(-6px);
  transition:opacity .4s,transform .4s var(--ease);
}
.ai-step.is-in{opacity:1;transform:none}
.ai-step i{
  width:4px;height:4px;flex:none;border-radius:50%;
  background:#4A4258;align-self:center;
  transition:background .3s,box-shadow .3s;
}
.ai-step.is-in i{background:#7BE0B4;box-shadow:0 0 6px rgba(123,224,180,.6)}
.ai-step b{font-weight:400;color:#C6BDDA;min-width:34px;letter-spacing:.04em}
.ai-step span{color:#8B8299;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ai-step:last-child b{color:#8FE0BC}
.ai-step:last-child span{color:#8FBFAE}

.ai-chips{
  display:flex;flex-wrap:wrap;gap:6px;
  padding:4px 18px 14px;
}
.ai-chips button{
  font-family:var(--f-mono);font-size:8px;letter-spacing:.02em;
  color:#A79EB9;
  border:1px solid rgba(234,229,246,.14);
  padding:5px 9px;border-radius:16px;
  transition:color .25s,border-color .25s,background .25s;
}
.ai-chips button:hover{color:#E4DCFF;border-color:rgba(180,155,255,.5);background:rgba(168,139,255,.10)}

.ai-input{
  margin:0 14px 10px;
  display:flex;align-items:center;gap:8px;
  height:42px;padding:0 6px 0 14px;
  background:rgba(255,255,255,.045);
  border:1px solid rgba(234,229,246,.12);
  border-radius:10px;
  font-size:11px;color:#7F778F;
}
.ai-input > span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ai-input .ai-caret{margin-left:-6px}
.ai-input button{
  margin-left:auto;flex:none;
  width:30px;height:30px;border-radius:7px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,#8E72E8,#4E9F9F);
  color:#fff;
  transition:transform .25s var(--ease),filter .25s;
}
.ai-input button:hover{transform:translateY(-1px);filter:brightness(1.12)}
.ai-input button svg{width:13px;height:13px;stroke-width:1.8}
.ai-foot{
  padding:0 16px 12px;
  font-family:var(--f-mono);font-size:7.5px;letter-spacing:.04em;
  color:#5E586E;
}

@media (max-width:1100px){
  .ai-layout{grid-template-columns:1fr;gap:44px}
  .ai-prose{max-width:38em}
}
@media (max-width:620px){
  .ai-bar{height:42px;padding:0 10px;gap:6px}
  .ai-bar b{display:none}
  .ai-models button{padding:4px 6px;font-size:7px}
  .ai-body{max-height:330px;padding:16px 12px 8px}
  .ai-msg p{font-size:12.5px}
  .ai-msg--user p{max-width:92%;font-size:12px}
  .ai-chips{padding-inline:12px}
  .ai-input{margin-inline:10px}
}