/* Basic Reset and Variables */
:root {
    --primary-color: #3f51b5; /* Indigo Blue */
    --secondary-color: #f4f4f9; /* Off-White Background */
    --text-color: #333;
    --border-radius: 8px;
    --max-width: 700px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

.container {
    background-color: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    max-width: var(--max-width);
    width: 90%;
    border-top: 5px solid var(--primary-color);
}

header h1 {
    color: var(--primary-color);
    font-size: 2em;
    margin-bottom: 25px;
    font-weight: 500;
}

main p {
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 1.1em;
}

.signature {
    font-style: italic;
    margin-top: 30px;
    color: #666;
}

/* Footer Style */
footer {
    margin-top: 20px;
    padding: 10px 0;
    font-size: 0.85em;
    color: #999;
    position: absolute;
    bottom: 0;
    width: 100%;
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .container {
        padding: 30px 20px;
        margin: 20px;
    }

    header h1 {
        font-size: 1.5em;
    }
}