body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 0;
}

.container {
    width: 80%;
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    padding: 0;
    margin-bottom: 20px;
}

nav ul li a {
    text-decoration: none;
    font-weight: bold;
    color: #444;
}

nav ul li.active a {
    color: #007ACC;
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

input[type="text"], input[type="password"] {
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

button {
    padding: 10px;
    background: #007ACC;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background: #005ea3;
}

.flash {
    padding: 10px;
    border-radius: 4px;
    margin: 10px 0;
}

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

.flash.danger {
    background-color: #f8d7da;
    color: #721c24;
}