body {
    font-family: Arial, sans-serif;
    background-color: #f4f6f8;
    margin: 0;
    padding: 0;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 15px;
    text-align: center;
}

nav {
    background-color: #34495e;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

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

.container {
    padding: 20px;
}

.card {
    background: white;
    padding: 20px;
    margin: 15px 0;
    border-radius: 8px;
    box-shadow: 0px 2px 6px rgba(0,0,0,0.1);
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}

input {
    padding: 8px;
    margin: 5px 0;
    width: 100%;
    max-width: 300px;
}

.success {
    color: green;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
}