body {
    background-color: #000000;
    color: #ffffff;
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}

/* Base structural layout */
header,
main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 60px;
}

header {
    text-align: center;
    padding-top: 50px;
    margin-bottom: 50px;
}

header h1 {
    font-size: 34px;
    margin: 0 0 24px 0;
    letter-spacing: 1px;
}

nav {
    border-bottom: 1px solid #243744;
    padding-bottom: 32px;
}

nav a {
    color: #7ea2b8;
    text-decoration: none;
    margin: 0 45px;
    font-size: 22px;
}

/* Aligns all main sections, titles, and images to a matching 900px content width */
.hero,
.intro,
.expertise,
.research,
.footer-info {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* Adds the upper divider lines precisely across the 900px content boundary */
.intro,
.expertise,
.research,
.footer-info {
    border-top: 1px solid #243744;
    padding-top: 70px;
    margin-top: 70px;
}

.hero h2 {
    color: #00B7EB;
    font-size: 48px;
    font-weight: 400;
    margin: 0 0 8px 0;
}

.subtitle {
    font-size: 22px;
    margin: 0;
}

.services {
    font-size: 30px;
    margin: 65px 0 55px 0;
}

.stadium-image {
    width: 100%;
    max-width: 900px;
    display: block;
    margin: 0 0 70px 0;
}

.intro h2,
.expertise h2,
.research h2 {
    max-width: 950px;
    color: #00B7EB;
    font-size: 34px;
    font-weight: 400;
    margin: 0 0 35px 0;
}

.intro p,
.research p {
    font-size: 20px;
    line-height: 1.35;
    max-width: 900px;
}

.button {
    display: inline-block;
    margin-top: 30px;
    color: #000000;
    background-color: #00B7EB;
    text-decoration: none;
    padding: 14px 22px;
    font-weight: bold;
}

.expertise-item {
    display: grid;
    grid-template-columns: 90px 1fr;
    column-gap: 40px;
    margin-bottom: 55px;
    align-items: start;
}

.number {
    color: #00B7EB;
    font-size: 80px;
    line-height: 1;
    border-right: 2px solid #7ea2b8;
    padding-right: 30px;
}

.expertise-text h3 {
    font-size: 27px;
    font-weight: 400;
    margin: 0 0 12px 0;
}

.expertise-text p {
    color: #7ea2b8;
    font-size: 20px;
    line-height: 1.25;
    margin: 0;
    max-width: 680px;
}

.research-image {
    width: 100%;
    max-width: 900px;
    margin-top: 40px;
    display: block;
}

.footer-info {
    padding-bottom: 120px;
}

.footer-info h2 {
    color: #7ea2b8;
    font-size: 18px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin: 0 0 30px 0;
}

.footer-info p {
    color: #7ea2b8;
    font-size: 14px;
    line-height: 1.6;
    max-width: 900px;
    margin: 0 0 7px 0;
}

/* Mobile Responsiveness styling */
@media (max-width: 800px) {

    header,
    main {
        padding: 0 24px;
    }

    header {
        padding-top: 40px;
        margin-bottom: 45px;
    }

    header h1 {
        font-size: 26px;
    }

    nav a {
        font-size: 18px;
        margin: 0 18px;
    }

    .hero h2 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 18px;
    }

    .services {
        font-size: 18px;
        line-height: 1.4;
        margin: 36px 0 34px 0;
    }

    .intro,
    .expertise,
    .research,
    .footer-info {
        padding-top: 50px;
        margin-top: 50px;
    }

    .intro h2 {
        font-size: 22px;
        line-height: 1.3;
    }

    .expertise h2,
    .research h2 {
        font-size: 28px;
    }

    .intro p,
    .research p {
        font-size: 16px;
        line-height: 1.6;
    }

    .expertise-item {
        grid-template-columns: 48px 1fr;
        column-gap: 18px;
        margin-bottom: 42px;
    }

    .number {
        font-size: 44px;
        padding-right: 14px;
    }

    .expertise-text h3 {
        font-size: 20px;
    }

    .expertise-text p {
        font-size: 16px;
        line-height: 1.35;
    }
}

.contact-page {
    max-width: 700px;
    margin: 0 auto;
    padding: 80px 0 120px 0;
}

.profile-image {
    width: 175px;
    max-width: 100%;
    display: block;
    margin-bottom: 40px;
}

.contact-details {
    margin-top: 40px;
}

.contact-details p {
    margin-bottom: 14px;
}

.availability {
    margin-top: 50px;
    color: #7ea2b8;
    font-size: 18px;
}

.contact-label {
    color: #7ea2b8;
}

.contact-details,
.contact-details a,
.contact-details a:visited {
    color: #ffffff;
    text-decoration: none;
}

.contact-details a:hover {
    color: #7ea2b8;
}