/* ============================================================
   TG 客服后台 · 设计系统
   风格：极简黑白 · 左侧导航布局（参考情怀积分后台）
   ============================================================ */
:root{
  --ink:#18181b; --ink2:#3f3f46; --mute:#71717a; --faint:#a1a1aa;
  --line:#e4e4e7; --line2:#d4d4d8; --soft:#f4f4f5; --bg:#fafafa; --card:#ffffff;
  --green:#16a34a; --red:#dc2626;
  --side-w:224px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); font-size:14px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--ink); text-decoration:none}
a:hover{color:#000}
.ico{width:16px; height:16px; flex:none; display:inline-block}

/* ---------------- 侧边栏 ---------------- */
.admin{display:flex; min-height:100vh}
.sidebar{
  position:fixed; inset:0 auto 0 0; width:var(--side-w); z-index:50;
  background:#fff; border-right:1px solid var(--line);
  display:flex; flex-direction:column;
}
.brand{display:flex; align-items:center; gap:10px; padding:16px 18px; border-bottom:1px solid var(--line); font-size:14px; font-weight:600; letter-spacing:-.2px; color:var(--ink)}
.brand-mark{width:28px; height:28px; border-radius:8px; background:var(--ink); color:#fff; display:inline-flex; align-items:center; justify-content:center; font-size:11px; font-weight:700; font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace; flex:none}
.brand-mark.lg{width:40px; height:40px; border-radius:10px; font-size:14px}
.side-nav{flex:1; padding:14px 12px; overflow-y:auto}
.side-group{margin:16px 10px 6px; font-size:11px; font-weight:600; letter-spacing:.8px; color:var(--faint); text-transform:uppercase}
.side-group:first-child{margin-top:2px}
.side-link{display:flex; align-items:center; gap:10px; padding:9px 12px; border-radius:7px; color:var(--mute); font-size:13.5px; transition:all .15s; margin-bottom:2px}
.side-link:hover{color:var(--ink); background:var(--soft)}
.side-link.active{background:var(--ink); color:#fff; font-weight:500}
.side-link.active .ico{color:#fff}
.side-link.active:hover{background:var(--ink); color:#fff}
.side-foot{padding:12px; border-top:1px solid var(--line)}
.logout-btn{width:100%; display:flex; align-items:center; gap:10px; background:none; border:none; cursor:pointer; color:var(--mute); font-size:13.5px; padding:9px 12px; border-radius:7px; font-family:inherit; transition:all .15s; text-align:left}
.logout-btn:hover{color:var(--red); background:#fef2f2}
.logout-btn:hover .ico{color:var(--red)}

/* ---------------- 内容区 ---------------- */
.content{margin-left:var(--side-w); padding:32px 36px 72px; max-width:1020px}
.content-narrow{margin-left:var(--side-w); padding:32px 36px 72px; max-width:680px}
.page-head{margin:4px 0 24px; display:flex; align-items:flex-end; justify-content:space-between; gap:16px; flex-wrap:wrap}
.eyebrow{font-size:11px; font-weight:600; letter-spacing:.8px; color:var(--faint); text-transform:uppercase; margin:0 0 6px}
.page-head h1{margin:0; font-size:24px; font-weight:700; letter-spacing:-.5px}
.page-sub{margin:6px 0 0; color:var(--mute); font-size:13px}
.stat-chip{display:inline-flex; align-items:center; gap:8px; padding:8px 16px; background:#fff; border:1px solid var(--line); border-radius:999px; font-size:13px; color:var(--mute)}
.stat-chip strong{font-size:16px; color:var(--ink); font-variant-numeric:tabular-nums}

/* ---------------- 卡片 / 按钮 ---------------- */
.card{background:var(--card); border:1px solid var(--line); border-radius:10px; padding:26px; transition:all .18s ease}
.btn{display:inline-flex; align-items:center; justify-content:center; gap:6px; background:var(--ink); color:#fff; border:1px solid var(--ink); border-radius:7px; padding:9px 18px; font-size:13px; font-weight:500; cursor:pointer; font-family:inherit; transition:all .15s}
.btn:hover{background:#27272a; border-color:#27272a}
.btn-ghost{background:#fff; color:var(--ink); border-color:var(--line)}
.btn-ghost:hover{background:var(--soft); border-color:var(--line2)}
.btn-danger-ghost{background:#fff; color:var(--red); border-color:#fecaca}
.btn-danger-ghost:hover{background:#fef2f2}
.btn-sm{padding:6px 12px; font-size:12px; border-radius:6px}

/* ---------------- 表单 ---------------- */
.field{display:block; margin-bottom:16px}
.field-label{display:block; font-size:12.5px; color:var(--ink2); font-weight:500; margin-bottom:6px}
.input,select.input,textarea.input{width:100%; height:40px; padding:0 12px; border:1px solid var(--line); border-radius:7px; font-size:13.5px; font-family:inherit; color:var(--ink); background:#fff; outline:none; transition:border-color .15s,box-shadow .15s}
textarea.input{height:auto; min-height:84px; padding:10px 12px; resize:vertical; line-height:1.65}
.input:focus{border-color:var(--ink); box-shadow:0 0 0 3px rgba(24,24,27,.08)}
.form-grid{display:grid; grid-template-columns:1fr 1fr; gap:0 20px}
@media(max-width:720px){.form-grid{grid-template-columns:1fr}}

/* ---------------- 提示条 ---------------- */
.alert{border-radius:7px; padding:10px 14px; font-size:13px; margin:0 0 16px; border:1px solid transparent}
.alert-error{background:#fef2f2; color:#b91c1c; border-color:#fecaca}
.alert-ok{background:#f0fdf4; color:#15803d; border-color:#bbf7d0}

/* ---------------- 表格 ---------------- */
.table-wrap{background:#fff; border:1px solid var(--line); border-radius:10px; overflow:hidden}
table{width:100%; border-collapse:collapse; font-size:13.5px}
th{font-size:11px; font-weight:600; letter-spacing:.6px; text-transform:uppercase; color:var(--faint); text-align:left; padding:12px 16px; background:#fafafa; border-bottom:1px solid var(--line); white-space:nowrap}
td{padding:13px 16px; border-bottom:1px solid var(--line); vertical-align:middle}
tbody tr:last-child td{border-bottom:none}
tbody tr{transition:background .12s}
tbody tr:hover{background:#fcfcfc}
.empty{color:var(--faint); text-align:center; padding:40px 16px !important; font-size:13px}
.mono{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace; font-size:12.5px; color:var(--ink2)}

/* ---------------- 状态徽章 ---------------- */
.pill{display:inline-block; padding:2px 10px; border-radius:999px; font-size:11.5px; font-weight:500; background:var(--soft); color:var(--ink2); border:1px solid var(--line); white-space:nowrap}
.pill-open{background:#eff6ff; color:#1d4ed8; border-color:#bfdbfe}
.pill-pending{background:#fffbeb; color:#b45309; border-color:#fde68a}
.pill-closed{background:var(--soft); color:var(--mute); border-color:var(--line)}

/* ---------------- 登录页 ---------------- */
.auth{min-height:100vh; display:flex; align-items:center; justify-content:center; padding:24px; background:radial-gradient(900px 500px at 15% -10%,#f0f0f2 0%,var(--bg) 60%)}
.auth-card{width:100%; max-width:384px; background:#fff; border:1px solid var(--line); border-radius:14px; padding:42px 38px 38px; box-shadow:0 24px 64px rgba(24,24,27,.07)}
.auth-head{margin-bottom:28px}
.auth-head h1{margin:18px 0 6px; font-size:20px; font-weight:700; letter-spacing:-.4px}
.auth-head p{margin:0; color:var(--mute); font-size:13px}
.auth-foot{margin-top:22px; padding-top:18px; border-top:1px solid var(--line); text-align:center; color:var(--faint); font-size:12px}

/* ---------------- 会话列表 ---------------- */
.conv-list{display:flex; flex-direction:column; gap:10px}
.conv-item{display:flex; align-items:center; gap:14px; background:#fff; border:1px solid var(--line); border-radius:10px; padding:15px 18px; transition:all .18s ease}
.conv-item:hover{border-color:var(--line2); box-shadow:0 2px 10px rgba(24,24,27,.05); transform:translateY(-1px)}
.avatar{width:38px; height:38px; border-radius:50%; background:var(--soft); border:1px solid var(--line); display:flex; align-items:center; justify-content:center; font-weight:600; font-size:14px; color:var(--ink2); flex:none}
.conv-main{flex:1; min-width:0}
.conv-name{font-weight:600; font-size:14px; display:flex; align-items:center; gap:8px; flex-wrap:wrap}
.conv-sub{font-size:12.5px; color:var(--mute); margin-top:3px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.conv-side{text-align:right; flex:none}
.conv-time{font-size:12px; color:var(--faint); display:block; margin-bottom:6px}
.conv-body{flex:1; display:flex; align-items:center; gap:14px; min-width:0; color:var(--ink)}
.conv-del{margin:0 0 0 6px; flex:none}
.conv-del-btn{width:32px; height:32px; border-radius:8px; border:1px solid var(--line); background:#fff; color:var(--faint); cursor:pointer; display:inline-flex; align-items:center; justify-content:center; padding:0; transition:all .15s}
.conv-del-btn:hover{color:var(--red); border-color:#fecaca; background:#fef2f2}
.live-dot{width:8px; height:8px; border-radius:50%; background:#a1a1aa; display:inline-block; flex:none; transition:background .2s}
.live-dot.on{background:var(--green); box-shadow:0 0 0 3px rgba(22,163,74,.15)}

/* ---------------- 聊天页 ---------------- */
.chat-page{margin-left:var(--side-w); max-width:840px; padding:22px 28px 32px; display:flex; flex-direction:column; min-height:100vh}
.back-link{display:inline-flex; align-items:center; gap:6px; color:var(--mute); font-size:13px; padding:6px 10px; border-radius:6px; margin-bottom:14px; width:fit-content}
.back-link:hover{color:var(--ink); background:var(--soft)}
.chat-head{display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap; background:#fff; border:1px solid var(--line); border-radius:10px; padding:16px 18px; margin-bottom:14px}
.chat-head h1{margin:0; font-size:17px; font-weight:700; letter-spacing:-.2px; display:flex; align-items:center; gap:10px}
.chat-meta{margin:3px 0 0; font-size:12.5px; color:var(--mute)}
.chat-tools{display:flex; gap:8px; flex-wrap:wrap; align-items:center}
.chat-tools select{height:34px; padding:0 10px; font-size:12.5px; width:auto}
.messages{display:flex; flex-direction:column; flex:1; padding:6px 2px 16px}
.msg-row{display:flex; flex-direction:column; margin-bottom:12px; max-width:82%}
.msg-user{align-self:flex-start}
.msg-admin{align-self:flex-end; align-items:flex-end}
.msg-bubble{padding:10px 14px; border-radius:12px; font-size:13.5px; line-height:1.65; word-break:break-word; white-space:pre-wrap}
.msg-user .msg-bubble{background:#fff; border:1px solid var(--line); border-bottom-left-radius:4px}
.msg-admin .msg-bubble{background:var(--ink); color:#fff; border-bottom-right-radius:4px}
.msg-meta{font-size:11px; color:var(--faint); margin-top:4px}
.reply-box{position:sticky; bottom:0; background:#fff; border:1px solid var(--line); border-radius:12px; padding:14px; box-shadow:0 -8px 24px rgba(24,24,27,.04)}
.reply-box textarea{margin-bottom:10px}
.reply-actions{display:flex; align-items:center; gap:10px; flex-wrap:wrap}
.file-btn{position:relative; overflow:hidden}
.file-btn input[type=file]{position:absolute; inset:0; opacity:0; cursor:pointer; width:100%}
.file-hint{font-size:12px; color:var(--faint)}

/* ---------------- 分区 ---------------- */
.section{margin-top:34px}
.section-head{display:flex; align-items:baseline; justify-content:space-between; gap:12px; margin-bottom:14px; flex-wrap:wrap}
.section-head h2{margin:0; font-size:17px; font-weight:700; letter-spacing:-.2px}
.section-head p{margin:4px 0 0; font-size:12.5px; color:var(--mute)}

/* ---------------- 广告编辑器 ---------------- */
#ad-editor{display:flex;flex-direction:column;gap:12px;margin:4px 0 12px}
.ad-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px}
.ad-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.ad-title{font-size:12.5px;font-weight:600;color:var(--mute)}
.drag-handle{cursor:grab;color:var(--faint);font-size:15px;user-select:none;line-height:1;padding:4px 2px;flex:none}
.drag-handle:active{cursor:grabbing}
.ad-img-row{display:flex;align-items:center;gap:10px;margin-top:10px;flex-wrap:wrap}
.ad-img-prev{width:72px;height:72px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.ad-btns{display:flex;flex-direction:column;gap:8px;margin:12px 0 10px}
.ad-btn{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ad-btn .input{flex:1;min-width:110px}
.ad-btn select.input{width:auto;min-width:96px;flex:none;height:34px}
.ad-same{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:var(--mute);white-space:nowrap}
.ad-bdel,.ad-del{border:1px solid var(--line);background:#fff;color:var(--faint);border-radius:6px;padding:5px 10px;font-size:12px;cursor:pointer;font-family:inherit}
.ad-bdel:hover,.ad-del:hover{color:var(--red);border-color:#fecaca;background:#fef2f2}
.ad-del{margin-left:auto}

@media(max-width:760px){
  :root{--side-w:64px}
  .brand{justify-content:center; padding:14px 0}
  .brand-text,.side-text,.side-group{display:none}
  .side-link{justify-content:center; padding:10px}
  .logout-btn{justify-content:center; padding:10px}
  .content,.content-narrow{padding:22px 14px 56px}
  .chat-page{padding:16px 12px 28px}
  .msg-row{max-width:94%}
  .chat-tools{width:100%}
}