body {
    background: #f4f6f8;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 400px;
    margin: 60px auto;
    background: #fff;
    padding: 32px 24px;
    border-radius: 8px;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}
h2 {
    text-align: center;
    margin-bottom: 24px;
    color: #2d3e50;
}
form {
    display: flex;
    flex-direction: column;
}
label {
    margin-bottom: 6px;
    color: #555;
}
input[type="text"],
input[type="password"] {
    padding: 10px;
    margin-bottom: 18px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1em;
}
button {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 4px;
    font-size: 1em;
    cursor: pointer;
    transition: background 0.2s;
}
button:hover {
    background: #0056b3;
}
.footer {
    text-align: center;
    margin-top: 18px;
    color: #888;
    font-size: 0.95em;
}
.error {
    color: #d9534f;
    margin-bottom: 12px;
    text-align: center;
}
.image-thumbnail {
    display: block;
    margin: 0 auto 16px;
    width: 300px;
    height: auto;
}