/* ===================== 基础 ===================== */
:root{
  --brand:#2F6B4F;
  --brand-dark:#245740;
  --ink:#1A1D1B;
  --body:#333834;
  --muted:#7A807A;
  --paper:#FFFFFF;
  --shell:#F3F4F0;
  --raise:#FAFBF8;
  --line:#E2E4DE;
  --signal:#C67B25;
  --danger:#B3452F;
  --radius:10px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}
[data-theme="dark"]{
  --ink:#ECEEE9; --body:#C9CDC6; --muted:#8B918A;
  --paper:#1E211F; --shell:#171A18; --raise:#262A27; --line:#333833;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font-family:var(--font);background:var(--shell);color:var(--body);
  font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
button{font-family:inherit;font-size:inherit;cursor:pointer}
input,textarea{font-family:inherit;font-size:inherit;color:inherit}
a{color:var(--brand)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--line);border-radius:6px}
::-webkit-scrollbar-track{background:transparent}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

/* ===================== 登录页 ===================== */
.auth-wrap{min-height:100%;display:grid;place-items:center;padding:24px}
.auth-card{
  width:100%;max-width:380px;background:var(--paper);border:1px solid var(--line);
  border-radius:14px;padding:36px 32px;
}
.auth-logo{
  width:40px;height:40px;border-radius:11px;background:var(--brand);
  display:grid;place-items:center;color:#fff;font-weight:600;font-size:18px;margin-bottom:20px;
}
.auth-card h1{margin:0 0 4px;font-size:21px;color:var(--ink);font-weight:600;letter-spacing:-.01em}
.auth-card .sub{margin:0 0 26px;color:var(--muted);font-size:14px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.field input{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  background:var(--raise);transition:border-color .15s;
}
.field input:focus{outline:none;border-color:var(--brand)}
.btn{
  width:100%;padding:11px;border:none;border-radius:8px;background:var(--brand);
  color:#fff;font-weight:500;transition:background .15s;
}
.btn:hover{background:var(--brand-dark)}
.btn:disabled{opacity:.55;cursor:default}
.btn-ghost{background:transparent;color:var(--brand);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--raise)}
.auth-switch{text-align:center;margin-top:18px;font-size:14px;color:var(--muted)}
.auth-switch a{cursor:pointer;text-decoration:none}
.msg{padding:9px 12px;border-radius:8px;font-size:13.5px;margin-bottom:14px;display:none}
.msg.err{display:block;background:#FBEDEA;color:var(--danger)}
.msg.ok{display:block;background:#EAF3EE;color:var(--brand-dark)}
[data-theme="dark"] .msg.err{background:#3A2320}
[data-theme="dark"] .msg.ok{background:#1F3229}

/* ===================== 主框架 ===================== */
.shell{display:flex;height:100%;overflow:hidden}
.sidebar{
  width:264px;flex-shrink:0;background:var(--shell);border-right:1px solid var(--line);
  display:flex;flex-direction:column;
}
.sb-head{padding:14px 14px 10px;display:flex;align-items:center;gap:9px}
.sb-logo{
  width:26px;height:26px;border-radius:8px;background:var(--brand);flex-shrink:0;
  display:grid;place-items:center;color:#fff;font-weight:600;font-size:13px;
}
.sb-title{font-weight:600;color:var(--ink);font-size:14.5px;flex:1;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sb-new{margin:0 14px 10px;padding:9px;border:1px solid var(--line);border-radius:9px;
  background:var(--paper);color:var(--ink);display:flex;align-items:center;gap:8px;
  justify-content:center;font-size:14px}
.sb-new:hover{background:var(--raise);border-color:var(--brand)}
.sb-list{flex:1;overflow-y:auto;padding:4px 8px}
.sb-group{font-size:12px;color:var(--muted);padding:10px 8px 6px}
.conv{
  padding:8px 10px;border-radius:8px;cursor:pointer;position:relative;
  display:flex;align-items:center;gap:8px;
}
.conv:hover{background:var(--raise)}
.conv.active{background:var(--paper);border:1px solid var(--line)}
.conv-main{flex:1;min-width:0}
.conv-title{font-size:14px;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-sub{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-acts{display:none;gap:2px}
.conv:hover .conv-acts,.conv.active .conv-acts{display:flex}
.icon-btn{
  border:none;background:transparent;color:var(--muted);padding:4px;border-radius:5px;
  line-height:1;font-size:13px;
}
.icon-btn:hover{background:var(--line);color:var(--ink)}
.sb-foot{padding:10px 14px;border-top:1px solid var(--line);display:flex;align-items:center;gap:8px}
.avatar{
  width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;
  display:grid;place-items:center;font-size:12px;font-weight:600;flex-shrink:0;
}
.sb-user{flex:1;font-size:13.5px;color:var(--ink);overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}

/* ===================== 对话区 ===================== */
.main{flex:1;display:flex;flex-direction:column;background:var(--paper);min-width:0}
.topbar{
  height:52px;flex-shrink:0;border-bottom:1px solid var(--line);
  display:flex;align-items:center;padding:0 18px;gap:10px;
}
.topbar .t{font-size:14.5px;color:var(--ink);font-weight:500;flex:1;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.stream{flex:1;overflow-y:auto;padding:26px 0 8px}
.col{max-width:760px;margin:0 auto;padding:0 26px}

.msg-row{margin-bottom:26px}
.msg-row.user{display:flex;justify-content:flex-end}
.bubble{
  background:var(--raise);border:1px solid var(--line);border-radius:14px;
  padding:10px 15px;max-width:78%;color:var(--ink);white-space:pre-wrap;word-break:break-word;
}
.assistant .who{
  font-size:12.5px;color:var(--muted);margin-bottom:6px;display:flex;align-items:center;gap:6px;
}
.assistant .who i{width:16px;height:16px;border-radius:5px;background:var(--brand);display:inline-block}
.prose{color:var(--body);word-break:break-word}
.prose>*:first-child{margin-top:0}
.prose>*:last-child{margin-bottom:0}
.prose h1,.prose h2,.prose h3,.prose h4{color:var(--ink);margin:1.4em 0 .5em;line-height:1.35}
.prose h1{font-size:1.4em}.prose h2{font-size:1.22em}.prose h3{font-size:1.08em}
.prose p{margin:.7em 0}
.prose ul,.prose ol{margin:.7em 0;padding-left:1.5em}
.prose li{margin:.25em 0}
.prose blockquote{
  margin:.9em 0;padding:.1em 0 .1em 1em;border-left:3px solid var(--line);color:var(--muted);
}
.prose hr{border:none;border-top:1px solid var(--line);margin:1.4em 0}
.prose code{
  background:var(--shell);padding:1.5px 5px;border-radius:4px;
  font-family:var(--mono);font-size:.88em;
}
.md-code{margin:.9em 0;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.md-code-bar{
  display:flex;justify-content:space-between;align-items:center;
  padding:5px 10px;background:var(--shell);border-bottom:1px solid var(--line);
  font-size:12px;color:var(--muted);
}
.md-copy{border:none;background:transparent;color:var(--muted);font-size:12px;padding:2px 6px;border-radius:4px}
.md-copy:hover{background:var(--line);color:var(--ink)}
.md-code pre{margin:0;padding:12px 14px;overflow-x:auto;background:var(--paper)}
.md-code code{background:none;padding:0;font-size:13px;line-height:1.6}
.md-table{border-collapse:collapse;width:100%;margin:.9em 0;font-size:14px}
.md-table th,.md-table td{border:1px solid var(--line);padding:7px 10px;text-align:left}
.md-table th{background:var(--shell);color:var(--ink);font-weight:600}
.md-img{max-width:100%;border-radius:8px}

.atts{display:flex;flex-wrap:wrap;gap:7px;margin-top:8px}
.att{
  display:flex;align-items:center;gap:7px;padding:6px 10px;background:var(--paper);
  border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--ink);
  text-decoration:none;max-width:230px;
}
.att:hover{border-color:var(--brand)}
.att .n{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att .s{color:var(--muted);font-size:12px;flex-shrink:0}

.waiting{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:13.5px}
.dots span{
  width:5px;height:5px;border-radius:50%;background:var(--muted);display:inline-block;
  margin-right:3px;animation:blink 1.4s infinite both;
}
.dots span:nth-child(2){animation-delay:.2s}
.dots span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
@media (prefers-reduced-motion:reduce){.dots span{animation:none;opacity:.6}}

/* ===================== 输入区 ===================== */
.composer{flex-shrink:0;padding:0 0 18px}
.composer .col{padding-top:6px}
.box{
  border:1px solid var(--line);border-radius:14px;background:var(--paper);
  padding:8px 8px 8px 14px;transition:border-color .15s;
}
.box:focus-within{border-color:var(--brand)}
.box textarea{
  width:100%;border:none;background:transparent;resize:none;outline:none;
  max-height:200px;line-height:1.6;padding:6px 0;display:block;
}
.box-bar{display:flex;align-items:center;gap:6px;margin-top:2px}
.box-bar .spacer{flex:1}
.send{
  width:32px;height:32px;border:none;border-radius:9px;background:var(--brand);color:#fff;
  display:grid;place-items:center;flex-shrink:0;
}
.send:disabled{background:var(--line);color:var(--muted)}
.pending{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:6px}
.pending .att{background:var(--shell)}
.hint{text-align:center;font-size:12px;color:var(--muted);margin-top:8px}

/* ===================== 状态点 ===================== */
.dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;display:inline-block;background:var(--muted)}
.dot.online{background:#2E9E5B}
.dot.away{background:var(--signal)}
.dot.offline{background:#C2C6C0}
[data-theme="dark"] .dot.offline{background:#4A504A}

.badge{
  min-width:18px;height:18px;padding:0 5px;border-radius:9px;background:var(--brand);color:#fff;
  font-size:11px;display:grid;place-items:center;flex-shrink:0;
}

/* ===================== 管理端 ===================== */
.admin .sidebar{width:320px}
.tabs{display:flex;gap:2px;padding:0 12px 8px}
.tab{
  flex:1;padding:6px;border:none;background:transparent;color:var(--muted);
  border-radius:7px;font-size:13.5px;
}
.tab.active{background:var(--paper);color:var(--ink);border:1px solid var(--line)}
.conv.admin-item{align-items:flex-start;padding:10px}
.conv .meta{display:flex;align-items:center;gap:6px;margin-bottom:2px}
.conv .who{font-size:13.5px;color:var(--ink);font-weight:500}
.conv .time{font-size:11.5px;color:var(--muted);margin-left:auto}
.reply-tag{font-size:11px;color:var(--signal)}
.empty{padding:60px 20px;text-align:center;color:var(--muted);font-size:14px}
.stat{display:flex;gap:14px;padding:8px 16px;font-size:12.5px;color:var(--muted);
  border-bottom:1px solid var(--line)}

/* ---- 会话绑定条（管理端）---- */
.bindbar{
  flex-shrink:0;display:flex;align-items:center;gap:8px;padding:8px 18px;
  border-bottom:1px solid var(--line);background:var(--shell);flex-wrap:wrap;
}
.bindbar input{
  flex:1;min-width:180px;padding:6px 10px;border:1px solid var(--line);
  border-radius:7px;background:var(--paper);font-size:13px;
}
.bindbar input:focus{outline:none;border-color:var(--brand)}
.mini{
  padding:6px 11px;border:1px solid var(--line);border-radius:7px;background:var(--paper);
  color:var(--ink);font-size:13px;white-space:nowrap;
}
.mini:hover{border-color:var(--brand);color:var(--brand)}
.mini.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.mini:disabled{opacity:.45;cursor:default}
.tip{font-size:12px;color:var(--muted)}
.tag-unbound{font-size:11px;color:var(--signal);border:1px solid var(--signal);
  border-radius:4px;padding:0 4px;line-height:1.5}
.toast{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:80;
  background:var(--ink);color:var(--paper);padding:9px 16px;border-radius:9px;
  font-size:13.5px;opacity:0;pointer-events:none;transition:opacity .2s;
}
.toast.show{opacity:.95}

/* ---- 发送状态 / 已读回执 ---- */
.msg-row.user{flex-direction:column;align-items:flex-end}
.status{
  font-size:11.5px;color:var(--muted);margin-top:4px;padding-right:2px;
  display:flex;align-items:center;gap:4px;
}
.status.sending{color:var(--muted);opacity:.7}
.status.read{color:var(--brand)}
.status.failed{color:var(--danger)}
.spin{
  width:9px;height:9px;border:1.5px solid var(--line);border-top-color:var(--muted);
  border-radius:50%;display:inline-block;animation:spin .7s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spin{animation-duration:2s}}
.conv .badge{margin-left:auto}
.conv-title-row{display:flex;align-items:center;gap:6px}

/* ===================== 移动端 ===================== */
.menu-btn{display:none;border:none;background:transparent;color:var(--ink);font-size:19px;padding:4px 8px}
@media (max-width:820px){
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;z-index:40;transform:translateX(-100%);
    transition:transform .22s ease;box-shadow:0 0 40px rgba(0,0,0,.12);
  }
  .sidebar.open{transform:none}
  .admin .sidebar,.sidebar{width:82vw;max-width:320px}
  .menu-btn{display:block}
  .backdrop{
    display:none;position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:30;
  }
  .backdrop.show{display:block}
  .col{padding:0 16px}
  .bubble{max-width:88%}
}