:root{
  --primary:#2B6CF6; --primary-shadow:rgba(43,108,246,.28);
  --bg:#F4F6F9; --surface:#fff; --text:#161A20; --text2:#8B93A1;
  --text3:#B6BDC8; --divider:#EEF1F5; --field:#F4F6F9;
  --green:#2FB170; --red:#D26A6A;
}
*{box-sizing:border-box}
body{
  margin:0;font-family:"Helvetica Neue",-apple-system,"PingFang SC","Microsoft YaHei",Inter,sans-serif;
  background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}

/* ===== 布局 ===== */
.layout{display:flex;min-height:100vh}
.sidebar{
  width:220px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--divider);
  padding:22px 14px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;padding:6px 10px 18px}
.brand .logo{width:34px;height:34px;border-radius:11px;background:var(--primary);position:relative;flex-shrink:0;box-shadow:0 6px 14px var(--primary-shadow)}
.brand .logo::before{content:"";position:absolute;left:8px;top:9px;width:12px;height:9px;border-radius:4px 4px 4px 1px;background:#fff}
.brand .logo::after{content:"";position:absolute;left:14px;top:14px;width:12px;height:9px;border-radius:4px 4px 1px 4px;background:rgba(255,255,255,.55)}
.brand b{font-size:16px;font-weight:700}
.brand span{font-size:11px;color:var(--text2);display:block;margin-top:1px}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:10px;color:var(--text2);font-size:14.5px;font-weight:500;cursor:pointer}
.nav-item svg{width:19px;height:19px;flex-shrink:0}
.nav-item:hover{background:var(--bg)}
.nav-item.active{background:rgba(43,108,246,.10);color:var(--primary);font-weight:600}
.nav-spacer{flex:1}
.nav-foot{font-size:12px;color:var(--text3);padding:8px 12px}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:60px;background:var(--surface);border-bottom:1px solid var(--divider);display:flex;align-items:center;justify-content:space-between;padding:0 26px;position:sticky;top:0;z-index:5}
.topbar h1{font-size:18px;font-weight:700;margin:0}
.topbar .who{font-size:13px;color:var(--text2)}
.topbar .who b{color:var(--text)}
.btn-text{font-size:13px;color:var(--primary);cursor:pointer;background:none;border:none;font-weight:600;margin-left:14px}
.content{padding:24px 26px;max-width:1100px}

/* ===== 卡片 / 统计 ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:22px}
.stat{background:var(--surface);border:1px solid var(--divider);border-radius:16px;padding:18px 18px}
.stat .label{font-size:13px;color:var(--text2)}
.stat .num{font-size:28px;font-weight:700;margin-top:6px}
.stat .num.accent{color:var(--primary)}
.stat .num.green{color:var(--green)}

.card{background:var(--surface);border:1px solid var(--divider);border-radius:16px;overflow:hidden;margin-bottom:18px}
.card-head{padding:15px 18px;border-bottom:1px solid var(--divider);display:flex;align-items:center;justify-content:space-between}
.card-head h2{font-size:15px;font-weight:700;margin:0}

/* ===== 表格 ===== */
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:12px 18px;font-size:13.5px;border-bottom:1px solid var(--divider);vertical-align:middle}
th{color:var(--text2);font-weight:600;background:#FBFCFD}
tr:last-child td{border-bottom:none}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;flex-shrink:0}
.avatar.sq{border-radius:11px}
.cell-user{display:flex;align-items:center;gap:10px}
.muted{color:var(--text2)}
.mono{font-family:ui-monospace,Menlo,monospace}

/* ===== 徽标 / 按钮 ===== */
.tag{display:inline-block;font-size:12px;padding:3px 9px;border-radius:8px;font-weight:600}
.tag.green{background:rgba(47,177,112,.12);color:var(--green)}
.tag.gray{background:#EEF1F5;color:var(--text2)}
.tag.red{background:rgba(210,106,106,.12);color:var(--red)}
.tag.blue{background:rgba(43,108,246,.12);color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;height:34px;padding:0 14px;border-radius:10px;border:none;font-size:13px;font-weight:600;cursor:pointer;font-family:inherit}
.btn.primary{background:var(--primary);color:#fff;box-shadow:0 6px 14px var(--primary-shadow)}
.btn.ghost{background:var(--bg);color:var(--text)}
.btn.danger{background:rgba(210,106,106,.12);color:var(--red)}
.btn.sm{height:28px;padding:0 10px;font-size:12px;border-radius:8px}
.actions{display:flex;gap:8px}

/* ===== 搜索框 ===== */
.search{display:flex;gap:10px;margin-bottom:18px}
.search input{flex:1;max-width:340px;height:40px;border:1px solid var(--divider);background:var(--surface);border-radius:11px;padding:0 14px;font-size:14px;outline:none}
.search input:focus{border-color:var(--primary)}

/* ===== 聊天气泡（会话详情）===== */
.chat{padding:18px;display:flex;flex-direction:column;gap:10px;background:var(--bg)}
.bubble{max-width:60%;padding:9px 13px;border-radius:14px;font-size:14px;line-height:1.5;position:relative}
.bubble .meta{font-size:11px;color:var(--text3);margin-bottom:3px}
.bubble.left{align-self:flex-start;background:#fff;border:1px solid var(--divider);border-top-left-radius:5px}
.bubble.right{align-self:flex-end;background:var(--primary);color:#fff;border-top-right-radius:5px}
.bubble.right .meta{color:rgba(255,255,255,.7)}
.bubble .del{font-size:11px;color:var(--red);cursor:pointer;margin-left:8px;opacity:.85}

/* ===== 登录页 ===== */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg)}
.login-card{width:360px;background:#fff;border-radius:20px;padding:38px 30px;box-shadow:0 20px 50px rgba(20,26,32,.08)}
.login-card .logo{width:60px;height:60px;border-radius:18px;background:var(--primary);margin:0 auto;position:relative;box-shadow:0 10px 24px var(--primary-shadow)}
.login-card .logo::before{content:"";position:absolute;left:14px;top:16px;width:21px;height:16px;border-radius:7px 7px 7px 2px;background:#fff}
.login-card .logo::after{content:"";position:absolute;left:25px;top:26px;width:21px;height:16px;border-radius:7px 7px 2px 7px;background:rgba(255,255,255,.55)}
.login-card h1{text-align:center;font-size:22px;margin:18px 0 4px}
.login-card p{text-align:center;color:var(--text2);font-size:13px;margin:0 0 26px}
.field{height:50px;background:var(--field);border-radius:12px;display:flex;align-items:center;padding:0 14px;margin-bottom:13px}
.field input{flex:1;border:none;background:none;outline:none;font-size:15px;color:var(--text)}
.login-btn{width:100%;height:50px;border:none;border-radius:13px;background:var(--primary);color:#fff;font-size:16px;font-weight:600;cursor:pointer;box-shadow:0 8px 20px var(--primary-shadow);margin-top:8px}
.err{color:var(--red);font-size:13px;min-height:18px;text-align:center;margin-top:10px}

@media(max-width:720px){
  .sidebar{display:none}
  .content{padding:16px}
}