:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --border: #dcdfe4;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --ok: #16a34a;
  --off: #dc2626;
  --warn: #b45309;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
}

.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}

.topnav .brand { font-weight: 700; }
.topnav .links a { margin-inline-start: 16px; color: var(--accent); text-decoration: none; }
.topnav .links a:hover { text-decoration: underline; }

.container {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

h1 { margin-top: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  margin-bottom: 16px;
}

th, td {
  text-align: right;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

tr.active-row { background: #eff6ff; }

.actions a, .actions button { margin-inline-end: 8px; }
.inline-form { display: inline; }

.status-ok { color: var(--ok); font-weight: 600; }
.status-off { color: var(--off); font-weight: 600; }
.warn { color: var(--warn); }
.error { color: var(--off); }
.small { font-size: 0.85em; color: var(--muted); }
.hint { color: var(--muted); }

form label {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
}

form input, form select, form textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1em;
  font-family: inherit;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 0.95em;
}

button:hover { opacity: 0.9; }
button.danger { background: var(--danger); }

a.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
}

a.button.secondary {
  background: var(--muted);
  margin-inline-start: 8px;
}

.login-box {
  max-width: 360px;
  margin: 80px auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
}