body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #f4f7fa;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    max-width: 400px;
    width: 100%;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 600;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus, input[type="password"]:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.3);
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
    padding: 12px 20px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 14px;
    transition: background-color 0.3s ease, transform 0.1s ease;
    width: 100%;
    margin-top: 10px;
}

button:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

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