body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background-color: #f4f6f9;
  margin: 0;
  padding: 0;
  color: #333;
}

.navbar {
  background-color: #2c3e50;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar .brand { color: #ffffff; font-weight: bold; font-size: 18px; }
.navbar ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 15px; }
.navbar a { color: #ecf0f1; text-decoration: none; font-size: 14px; font-weight: 500; }
.navbar a.active, .navbar a:hover { color: #3498db; text-decoration: underline; }

.container {
  max-width: 900px;
  margin: 30px auto;
  background: #ffffff;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

h2 { margin-top: 0; color: #1a252f; font-size: 22px; }

.form-group { margin-bottom: 16px; }
label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: #4a5568; }

input, select, textarea {
  width: 100%; padding: 10px; font-size: 14px;
  border: 1px solid #cbd5e0; border-radius: 6px; box-sizing: border-box;
}

button {
  width: 100%; padding: 12px; font-size: 15px; font-weight: bold;
  color: #ffffff; background-color: #3182ce; border: none; border-radius: 6px; cursor: pointer;
}

button:hover { background-color: #2b6cb0; }

table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 14px; }
th, td { padding: 12px; border: 1px solid #e2e8f0; text-align: left; }
th { background-color: #f7fafc; font-weight: bold; }

.badge-low { background-color: #fed7d7; color: #9b2c2c; padding: 4px 8px; border-radius: 4px; font-size: 12px; font-weight: bold; }
.badge-ok { background-color: #c6f6d5; color: #22543d; padding: 4px 8px; border-radius: 4px; font-size: 12px; font-weight: bold; }

#status { margin-top: 15px; font-weight: bold; text-align: center; }
#status.success { color: #276749; }
#status.error { color: #9b2c2c; }