/* ERTC assistant widget — inherits the portal's celadon / paper / seal palette. */
.ertc-fab{
  position:fixed; right:22px; bottom:22px; z-index:70;
  display:flex; align-items:center; gap:10px;
  padding:12px 18px 12px 14px;
  background:var(--celadon-deep,#3D5A4D); color:var(--paper,#EFF2ED);
  border:1px solid rgba(27,36,32,.25); border-radius:2px; cursor:pointer;
  font-family:var(--mono,"IBM Plex Mono",monospace); font-size:12px; letter-spacing:.16em; text-transform:uppercase;
  box-shadow:0 6px 24px rgba(27,36,32,.22); transition:transform .2s, background .2s;
}
.ertc-fab:hover{ transform:translateY(-2px); background:var(--ink,#1B2420); }
.ertc-fab .cjk{ font-family:var(--tc,"Noto Serif TC",serif); font-size:17px; letter-spacing:0; }
.ertc-fab:focus-visible{ outline:2px solid var(--seal,#A63A2B); outline-offset:3px; }

.ertc-chat{
  position:fixed; right:22px; bottom:22px; z-index:71;
  width:min(400px, calc(100vw - 32px)); height:min(560px, calc(100vh - 40px));
  display:flex; flex-direction:column;
  background:var(--paper,#EFF2ED); color:var(--ink,#1B2420);
  border:1px solid var(--hairline,rgba(27,36,32,.16));
  box-shadow:0 18px 60px rgba(27,36,32,.28);
  transform:translateY(16px) scale(.98); opacity:0; pointer-events:none;
  transition:opacity .22s ease, transform .22s ease;
  font-family:var(--serif,"Spectral",serif);
}
.ertc-chat.open{ transform:none; opacity:1; pointer-events:auto; }

.ertc-chat-head{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:16px 18px; border-bottom:1px solid var(--hairline,rgba(27,36,32,.16));
  background:linear-gradient(180deg, rgba(126,158,144,.14), transparent);
}
.ertc-chat-head .t{ font-weight:600; font-size:16px; }
.ertc-chat-head .s{ font-family:var(--mono,monospace); font-size:10.5px; letter-spacing:.1em; color:var(--ink-soft,#41504A); margin-top:3px; }
.ertc-head-ctl{ display:flex; align-items:center; gap:8px; }
#ertc-provider-select{
  font-family:var(--mono,monospace); font-size:10.5px; color:var(--ink-soft,#41504A);
  background:rgba(255,255,255,.5); border:1px solid var(--hairline,rgba(27,36,32,.16)); padding:5px 6px; max-width:120px;
}
.ertc-x{ background:none; border:none; font-size:24px; line-height:1; color:var(--ink-soft,#41504A); cursor:pointer; padding:0 4px; }
.ertc-x:hover{ color:var(--seal,#A63A2B); }

.ertc-log{ flex:1; overflow-y:auto; padding:18px; display:flex; flex-direction:column; gap:14px; }
.ertc-msg{ max-width:85%; font-size:15px; line-height:1.55; }
.ertc-msg.user{ align-self:flex-end; background:var(--celadon-deep,#3D5A4D); color:var(--paper,#EFF2ED); padding:10px 14px; border-radius:2px; }
.ertc-msg.bot{ align-self:flex-start; border-left:3px solid var(--celadon,#7E9E90); padding:2px 0 2px 14px; color:var(--ink,#1B2420); }
.ertc-msg.bot.sys{ font-style:italic; color:var(--ink-soft,#41504A); border-left-color:var(--seal,#A63A2B); }
.ertc-msg.err{ border-left-color:var(--seal,#A63A2B); color:var(--seal,#A63A2B); font-family:var(--mono,monospace); font-size:12.5px; }
.ertc-msg .meta{ display:block; margin-top:6px; font-family:var(--mono,monospace); font-size:9.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--celadon-deep,#3D5A4D); }
.ertc-typing{ font-family:var(--mono,monospace); font-size:12px; color:var(--ink-soft,#41504A); letter-spacing:.14em; }

.ertc-form{ display:flex; gap:0; border-top:1px solid var(--hairline,rgba(27,36,32,.16)); }
.ertc-form input{
  flex:1; border:none; background:transparent; padding:14px 16px; font-family:var(--serif,"Spectral",serif); font-size:15px; color:var(--ink,#1B2420);
}
.ertc-form input:focus{ outline:none; }
.ertc-form button{
  border:none; background:var(--ink,#1B2420); color:var(--paper,#EFF2ED); padding:0 20px; font-size:18px; cursor:pointer; transition:background .2s;
}
.ertc-form button:hover{ background:var(--celadon-deep,#3D5A4D); }
.ertc-form button:disabled{ opacity:.5; cursor:default; }

@media (max-width:520px){
  .ertc-chat{ right:0; bottom:0; width:100vw; height:100dvh; border:none; }
}