body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background-color: #f4f6f9;
  color: #333;
}

header {
  background-color: #0d6efd;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header img.logo {
  height: 40px;
}

nav a {
  color: white;
  margin-left: 1rem;
  text-decoration: none;
  font-weight: 600;
}

.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background-color: white;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-bottom: 1rem;
}

button {
  background-color: #0d6efd;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #0b5ed7;
}

input, select, textarea {
  width: 100%;
  padding: 0.5rem;
  margin: 0.5rem 0 1rem 0;
  border: 1px solid #ccc;
  border-radius: 5px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th, table td {
  padding: 0.75rem;
  border-bottom: 1px solid #ddd;
}

.success {
  color: green;
}

.error {
  color: red;
}