* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f4f6f9 0%, #e9edf3 100%);
    background-attachment: fixed;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    color: #2d3748;
    line-height: 1.6;
}

#header {
    width: 100%;
    min-height: 200px;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.12);
    padding: 40px 20px;
}

#header h2 {
    color: #ffffff;
    font-size: 42px;
    font-weight: 700;
    margin: 0;
    letter-spacing: 1px;
    text-align: center;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.35);
}

#header h2 a {
    color: #ffffff;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

#header h2 a:hover {
    opacity: 0.85;
}

#body {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

#main_content {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
    padding: 50px;
    margin-bottom: 40px;
}

#content {
    width: 100%;
}

#content h2 {
    color: #1e40af; /* professional deep blue */
    font-size: 28px;
    font-weight: 600;
    margin: 35px 0 15px 0;
    padding-bottom: 10px;
    border-bottom: 3px solid #3b82f6;
}

#content h2:first-child {
    margin-top: 0;
}

.paragraph {
    margin: 18px 0;
    line-height: 1.8;
    font-size: 17px;
    color: #374151;
    text-align: left;
}

p {
    margin: 18px 0;
    line-height: 1.8;
    font-size: 17px;
    color: #374151;
}

#content ul {
    margin: 20px 0;
    padding: 0 0 0 25px;
    list-style-type: none;
}

#content li {
    margin-bottom: 12px;
    padding-left: 30px;
    position: relative;
    line-height: 1.8;
    font-size: 17px;
    color: #374151;
}

#content li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #3b82f6; /* subtle professional accent blue */
    font-size: 20px;
    font-weight: bold;
}

a {
    color: #1d4ed8;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

a:hover {
    color: #2563eb;
    text-decoration: underline;
}

strong {
    color: #111827;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    #header h2 {
        font-size: 32px;
    }

    #main_content {
        padding: 30px 25px;
    }

    #content h2 {
        font-size: 24px;
    }

    .paragraph,
    p,
    #content li {
        font-size: 16px;
    }

    #body {
        margin: 20px auto;
    }
}

@media (max-width: 480px) {
    #header {
        min-height: 150px;
        padding: 30px 15px;
    }

    #header h2 {
        font-size: 26px;
    }

    #main_content {
        padding: 25px 20px;
    }

    #content h2 {
        font-size: 22px;
    }
}