:root {
    --primary-color: #4a90e2;
    --background-color: #f4f7f6;
    --text-color: #333;
    --container-bg: #ffffff;
    --border-color: #ddd;
    --error-color: #e74c3c;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.login-container {
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input[type="password"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: #357abd;
}

.error-message {
    color: var(--error-color);
    background-color: #fbeae5;
    border: 1px solid var(--error-color);
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    text-align: center;
    display: none; /* Initially hidden */
}