body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #2F73D6;
    color: white;
    padding: 15px 0;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo img {
    vertical-align: middle;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: 500;
}

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

.avatar img {
    border-radius: 50%;
    vertical-align: middle;
}

main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 20px;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border-radius: 8px;
}

h1, h2 {
    color: #2F73D6;
}

form {
    display: flex;
    flex-direction: column;
    max-width: 400px;
    margin: 0 auto;
}

input[type="text"], input[type="password"] {
    margin: 12px 0;
    padding: 12px;
    border: 1px solid #2F73D6;
    border-radius: 6px;
    font-size: 16px;
}

button {
    background-color: #2F73D6;
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 6px;
    margin-top: 10px;
}

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

.error {
    color: #dc3545;
    margin: 10px 0;
    font-weight: bold;
}

footer {
    background-color: #f8f9fa;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 0.9em;
    color: #555;
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    nav {
        text-align: center;
    }
}