:root {
  --bg: #f4f6f8;
  --card: #fff;
  --line: #e3e8ee;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #0f6cbd;
  --danger: #b42318;
  --ok: #067647;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: #0b3d66;
  color: #fff;
}
.topbar a { color: #dbeafe; margin-left: 14px; text-decoration: none; font-size: 14px; }
.topbar a:hover { color: #fff; }
.brand { font-weight: 700; letter-spacing: .02em; }
.container { max-width: 1100px; margin: 24px auto; padding: 0 16px 40px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 16px;
}
h1 { font-size: 22px; margin: 0 0 12px; }
h2 { font-size: 16px; margin: 0 0 10px; }
.muted { color: var(--muted); font-size: 13px; }
.alert { padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; }
.alert.ok { background: #ecfdf3; color: var(--ok); }
.alert.err { background: #fef3f2; color: var(--danger); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.btn {
  display: inline-block;
  border: 0;
  background: var(--primary);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  font-size: 14px;
}
.btn.secondary { background: #475569; }
.btn.danger { background: var(--danger); }
.btn.small { padding: 4px 8px; font-size: 12px; }
.form-row { margin-bottom: 12px; }
.form-row label { display: block; font-size: 13px; margin-bottom: 4px; color: var(--muted); }
.form-row input, .form-row select, .form-row textarea {
  width: 100%;
  max-width: 520px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 800px) { .grid2 { grid-template-columns: 1fr; } .topbar { flex-direction: column; align-items: flex-start; gap: 8px; } }
.login-wrap { max-width: 400px; margin: 80px auto; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.tag.on { background: #ecfdf3; color: var(--ok); }
.tag.off { background: #f3f4f6; color: #4b5563; }
.tag.warn { background: #fff7ed; color: #c2410c; }
.actions form { display: inline; }
.captcha-img { max-width: 220px; border: 1px solid var(--line); border-radius: 6px; }