body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  color: #333;
}

header {
  background-color: #2c3e50;
  color: #fff;
  padding: 10px 20px;
}

header h1 {
  margin: 0;
  font-size: 24px;
}

nav a {
  color: #ecf0f1;
  text-decoration: none;
  margin-right: 15px;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1000px;
  margin: 20px auto;
  padding: 20px;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="number"],
form textarea,
form select {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

button {
  padding: 10px 20px;
  background-color: #27ae60;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #1e8449;
}

.alert {
  padding: 10px;
  margin-bottom: 15px;
  border-radius: 4px;
}

.alert-success {
  background-color: #d4edda;
  border: 1px solid #c3e6cb;
  color: #155724;
}

.alert-error {
  background-color: #f8d7da;
  border: 1px solid #f5c6cb;
  color: #721c24;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 15px;
}

th, td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}

th {
  background-color: #f2f2f2;
}