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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;

    background-color: #2c3e50;
    color: white;

    padding: 20px 40px;
}

header h1 {
    margin: 0;
}

nav {
    display: flex;
    gap: 20px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

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

main {
    padding: 40px;
}

footer {
    border-top: 1px solid #ccc;
    padding: 20px 40px;
}

.flash-success {
    background-color: #d4edda;
    color: #155724;

    border: 1px solid #c3e6cb;
    border-left: 5px solid #28a745;

    padding: 15px;
    margin-bottom: 20px;

    border-radius: 6px;

    font-size: 16px;
    font-weight: 500;

    transition: opacity 0.6s ease;
}

.flash-hide {
    opacity: 0;
}

.flash-error {
    background: #f8d7da;
    color: #842029;

    border: 1px solid #f5c2c7;
    border-left: 5px solid #dc3545;

    padding: 15px;
    margin-bottom: 20px;

    border-radius: 6px;

    transition: opacity 0.6s ease;
}

.flash-error ul {
    margin: 0;
    padding-left: 20px;
}