* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f0f2f5;
  color: #1a1a1a;
}
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: #111b21;
  color: #e9edef;
  flex-shrink: 0;
  padding: 20px 0;
}
.sidebar .brand { padding: 0 20px 20px; font-weight: 700; font-size: 18px; color: #00a884; }
.sidebar nav a {
  display: block;
  padding: 12px 20px;
  color: #d1d7db;
  text-decoration: none;
  font-size: 14px;
}
.sidebar nav a:hover { background: #202c33; }
.sidebar nav a.active { background: #00a884; color: #fff; font-weight: 600; }
.sidebar .logout { margin-top: 30px; border-top: 1px solid #2a3942; padding-top: 12px; }
.main { flex: 1; padding: 30px 40px; }
h1 { font-size: 22px; margin: 0 0 20px; }
.card {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
}
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid #eee; }
th { color: #667781; font-weight: 600; font-size: 12px; text-transform: uppercase; }
.badge { padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge-connected { background: #d9fdd3; color: #075e54; }
.badge-qr { background: #fff3cd; color: #856404; }
.badge-connecting { background: #e2e3e5; color: #383d41; }
.badge-disconnected { background: #f8d7da; color: #842029; }
.badge-sent { background: #d9fdd3; color: #075e54; }
.badge-failed { background: #f8d7da; color: #842029; }
.btn {
  display: inline-block;
  background: #00a884;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
}
.btn:hover { background: #06906f; }
.btn-danger { background: #dc3545; }
.btn-danger:hover { background: #bb2d3b; }
.btn-secondary { background: #6c757d; }
form.inline { display: inline; }
input[type=text], input[type=password] {
  padding: 9px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 14px;
  width: 100%;
}
label { display: block; margin-bottom: 6px; font-size: 13px; color: #555; font-weight: 600; }
.field { margin-bottom: 16px; max-width: 400px; }
.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #f8d7da; color: #842029; }
.alert-info { background: #e7f3ff; color: #084298; }
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: #111b21; }
.login-box { background: #fff; padding: 40px; border-radius: 10px; width: 320px; }
.login-box h1 { color: #00a884; text-align: center; }
code { background: #f0f2f5; padding: 2px 6px; border-radius: 4px; font-size: 13px; }
pre { background: #1e1e1e; color: #d4d4d4; padding: 14px; border-radius: 6px; overflow-x: auto; font-size: 13px; }
.muted { color: #667781; font-size: 13px; }
.qr-box { text-align: center; padding: 20px; }