body {
    font-family: sans-serif;
    background: #f2f2f2;
    margin: 0;
    padding: 0;
}

.top-nav {
    background-color: #ffffff;
    padding: 12px 20px;
    border-bottom: 1px solid #ccc;
    display: flex;
    justify-content: center;
    gap: 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.top-nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

.top-nav a:hover {
    color: #007bff;
}

.container {
    max-width: 600px;
    margin: 40px auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

input, button {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    box-sizing: border-box;
    border-radius: 4px;
    border: 1px solid #ccc;
}

label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    margin-top: 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

.alert.success {
    background-color: #d4edda;
    color: #155724;
    padding: 10px;
    border-left: 5px solid #28a745;
    margin-bottom: 15px;
}

.alert.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-left: 5px solid #dc3545;
    margin-bottom: 15px;
}