:root{
  --color-bg:#f7f9fb;
  --color-card:#ffffff;
  --color-primary:#0bb4a6;
  --color-primary-600:#089a8f;
  --color-text:#2b2f33;
  --color-muted:#6b7280;
  --color-border:#e5e7eb;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--color-bg);color:var(--color-text);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Microsoft YaHei",sans-serif}
a{text-decoration:none;color:inherit}
.layout{display:grid;grid-template-columns:260px 1fr;grid-template-rows:64px 1fr;height:100vh}
.sidebar{grid-row:1/span 2;background:#0fc5b7;color:#fff;display:flex;flex-direction:column}
.brand{height:64px;display:flex;align-items:center;padding:0 16px;font-weight:700;letter-spacing:.3px}
.brand .logo{width:28px;height:28px;border-radius:6px;background:#fff;margin-right:10px}
.nav{flex:1;overflow:auto;padding:12px 8px}
.nav a{display:flex;align-items:center;padding:10px 12px;border-radius:10px;color:#eaf7f5}
.nav a.active,.nav a:hover{background:rgba(255,255,255,.16);color:#fff}
.nav i{margin-right:10px}
.topbar{grid-column:2;background:var(--color-card);display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--color-border)}
.search{display:flex;align-items:center;background:#f1f5f9;border:1px solid var(--color-border);border-radius:10px;padding:6px 10px;width:420px}
.search input{border:none;background:transparent;outline:none;width:100%}
.avatar{width:34px;height:34px;border-radius:50%;background:#ddd}
.content{grid-column:2;padding:18px}
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}
.card{background:var(--color-card);border:1px solid var(--color-border);border-radius:14px;box-shadow:0 6px 20px rgba(16,24,40,.06)}
.card .hd{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--color-border)}
.card .bd{padding:16px}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;border-radius:10px;padding:8px 12px;background:var(--color-primary);color:#fff;cursor:pointer}
.btn.secondary{background:#eef6f5;color:#0b877f}
.btn:hover{background:var(--color-primary-600)}
.table{width:100%;border-collapse:separate;border-spacing:0}
.table th,.table td{padding:10px 12px;border-bottom:1px solid var(--color-border);font-size:14px;color:#3b3f44}
.badge{padding:4px 8px;border-radius:999px;background:#ecfeff;color:#065f46;border:1px solid #a5f3fc;font-size:12px}
.status-open{background:#e0f2fe;color:#075985;border-color:#93c5fd}
.status-closed{background:#f3f4f6;color:#374151;border-color:#e5e7eb}
.toolbar{display:flex;gap:8px;align-items:center}
.chat{display:grid;grid-template-columns:340px 1fr;gap:16px}
.chat .list{height:calc(100vh - 160px);overflow:auto}
.chat .panel{display:grid;grid-template-rows:auto 1fr auto;height:calc(100vh - 160px)}
.chat .msgs{overflow:auto;padding:12px}
.bubble{max-width:60%;padding:10px 12px;border-radius:14px;margin:10px 0;font-size:14px;line-height:1.5}
.bubble.me{background:#e6fffb;margin-left:auto}
.bubble.other{background:#f3f4f6}
.inputbar{display:flex;gap:8px;padding:12px;border-top:1px solid var(--color-border)}
.inputbar input{flex:1;padding:10px;border:1px solid var(--color-border);border-radius:10px}
.lang-switch{display:flex;gap:8px}
.kpi{display:flex;gap:18px}
.kpi .item{flex:1;padding:14px 16px;border:1px solid var(--color-border);border-radius:12px;background:#fff}