/* LUMÉRA AI 顾问 —— 静奢风：黑白、衬线标题、无花哨 */
#nvchat-fab{position:fixed;right:26px;bottom:26px;width:54px;height:54px;border-radius:50%;
  background:#111;color:#F4F5F7;border:0;cursor:pointer;z-index:880;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 30px rgba(17,17,17,.25);transition:transform .2s,opacity .25s}
#nvchat-fab:hover{transform:translateY(-2px)}
#nvchat-fab.hide{opacity:0;pointer-events:none}
#nvchat-win{position:fixed;right:26px;bottom:26px;width:380px;max-width:calc(100vw - 32px);height:540px;max-height:calc(100vh - 60px);
  background:#fff;z-index:890;display:flex;flex-direction:column;border-radius:3px;overflow:hidden;
  box-shadow:0 24px 70px rgba(17,17,17,.28);opacity:0;visibility:hidden;transform:translateY(14px);transition:.28s}
#nvchat-win.on{opacity:1;visibility:visible;transform:translateY(0)}
#nvchat-win header{background:#0A0A0A;color:#F4F5F7;padding:16px 18px;display:flex;justify-content:space-between;align-items:center;flex:0 0 auto}
.nvch-t{font-family:"Cinzel",Georgia,serif;font-size:16px;letter-spacing:4px}
.nvch-s{font-size:10.5px;color:#9AA0A6;letter-spacing:.5px;margin-top:3px}
.nvch-x{background:none;border:0;color:#8A8F94;font-size:14px;cursor:pointer;padding:4px}
.nvch-x:hover{color:#fff}
#nvchat-body{flex:1 1 auto;overflow-y:auto;padding:16px;background:#F7F7F8}
.nvch-m{max-width:82%;padding:10px 14px;margin-bottom:10px;font-size:13px;line-height:1.65;border-radius:3px;
  font-family:"Montserrat","Noto Sans SC",system-ui,sans-serif;word-break:break-word}
.nvch-m.bot{background:#fff;color:#26282B;box-shadow:0 1px 3px rgba(17,17,17,.06)}
.nvch-m.me{background:#111;color:#F4F5F7;margin-left:auto}
.nvch-typing i{font-style:normal;font-size:12px;color:#8A8F94;letter-spacing:.3px;margin-right:4px}
.nvch-typing span{display:inline-block;width:5px;height:5px;border-radius:50%;background:#B9BDC2;margin:0 2px;
  animation:nvchb 1.2s infinite}
.nvch-typing span:nth-child(2){animation-delay:.18s}
.nvch-typing span:nth-child(3){animation-delay:.36s}
@keyframes nvchb{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
#nvchat-bar{flex:0 0 auto;display:flex;gap:8px;padding:12px;border-top:1px solid #E4E6E9;background:#fff}
#nvchat-in{flex:1;padding:11px 13px;border:1px solid #E4E6E9;border-radius:2px;font-size:13px;
  font-family:"Montserrat","Noto Sans SC",system-ui,sans-serif}
#nvchat-in:focus{outline:0;border-color:#111}
#nvchat-send{background:#111;color:#fff;border:0;padding:0 18px;font-size:11px;letter-spacing:1.6px;
  text-transform:uppercase;cursor:pointer;border-radius:2px}
#nvchat-send:disabled{background:#C9CDD2}
@media(max-width:520px){#nvchat-win{right:8px;bottom:8px;width:calc(100vw - 16px);height:calc(100vh - 90px)}}