:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --text-color: #333;
    --background-color: #f5f5f5;
    --error-color: #f44336;
    --border-radius: 10px;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.login-container {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    font-size: 1rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    display: block;
}

input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ccc;
    border-radius: var(--border-radius);
    box-sizing: border-box;
    font-size: 1rem;
}

input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.3);
}

button {
    width: 100%;
    padding: 0.75rem;
    font-size: 1.2rem;
    color: white;
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: var(--primary-hover);
}

.error-message {
    color: var(--error-color);
    text-align: center;
    margin-top: 1rem;
}

@media (max-width: 480px) {
    .login-container {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    input, button {
        font-size: 1rem;
    }
}