body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #1e1e1e;
  color: #e0e0e0;
}

nav {
  background-color: #2d2d2d;
  padding: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: space-around;
}

nav ul li {
  display: inline;
}

nav ul li a {
  color: #00bcd4;
  text-decoration: none;
  padding: 10px 15px;
  border-radius: 5px;
  transition: background-color 0.3s;
}

nav ul li a:hover {
  background-color: #3a3a3a;
}

.container {
  max-width: 1200px;
  margin: 20px auto;
  padding: 20px;
  background-color: #2d2d2d;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

h1, h2 {
  color: #00bcd4;
}

button, input[type="submit"] {
  background-color: #00bcd4;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover, input[type="submit"]:hover {
  background-color: #008c9e;
}

input, select, textarea {
  background-color: #3a3a3a;
  color: #e0e0e0;
  border: 1px solid #555;
  padding: 8px;
  border-radius: 5px;
  margin: 5px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

table, th, td {
  border: 1px solid #555;
}

th, td {
  padding: 10px;
  text-align: left;
}

th {
  background-color: #3a3a3a;
  color: #00bcd4;
}

tr:nth-child(even) {
  background-color: #333;
}

tr:hover {
  background-color: #444;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
  background-color: #2d2d2d;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #555;
  width: 80%;
  max-width: 500px;
  border-radius: 8px;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover, .close:focus {
  color: #e0e0e0;
  text-decoration: none;
  cursor: pointer;
}

.alert {
  padding: 10px;
  margin: 10px 0;
  border-radius: 5px;
}

.alert-success {
  background-color: #1b5e20;
  color: #c8e6c9;
}

.alert-error {
  background-color: #b71c1c;
  color: #ffcdd2;
}

.edit-form {
  display: none;
  margin-top: 10px;
  padding: 10px;
  border: 1px solid #555;
  background-color: #3a3a3a;
  color: #e0e0e0;
}

.edit-form input,
.edit-form select,
.edit-form label {
  margin: 5px 0;
  color: #e0e0e0;
}