* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
                 Roboto, Helvetica, Arial, sans-serif;
    color: #222;
    background: #fff;
    line-height: 1.6;
}

header {
    border-bottom: 1px solid #ddd;
    background: #fafafa;
}

nav {
    max-width: 1000px;
    margin: auto;
    padding: 22px 24px;

    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    font-weight: 700;
    letter-spacing: 0.04em;
}

.menu a {
    color: #333;
    text-decoration: none;
    margin-left: 22px;
}

.menu a:hover {
    text-decoration: underline;
}

main {
    max-width: 1000px;
    margin: auto;
    padding: 60px 24px;
}

.hero {
    padding: 30px 0 70px;
}

.hero.small {
    padding-bottom: 45px;
}

h1 {
    font-size: clamp(2.3rem, 6vw, 4rem);
    line-height: 1.05;
    margin: 0 0 25px;
    font-weight: 600;
}

h2 {
    font-size: 1.8rem;
    margin-top: 55px;
    margin-bottom: 22px;
    font-weight: 600;
}

h3 {
    font-size: 1.25rem;
    margin-top: 0;
}

p {
    max-width: 760px;
}

.intro {
    font-size: 1.3rem;
    color: #555;
    max-width: 720px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(
        auto-fit,
        minmax(250px, 1fr)
    );
    gap: 25px;
    margin-top: 30px;
}

.card {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 26px;
}

.reference {
    border-left: 3px solid #ddd;
    padding-left: 25px;
    margin-bottom: 50px;
}

.reference h2 {
    margin-top: 0;
}

.support {
    border-top: 1px solid #ddd;
    margin-top: 65px;
    padding-top: 10px;
}

a {
    color: #164f8a;
}

footer {
    border-top: 1px solid #ddd;
    margin-top: 40px;
    padding: 28px 24px;
    color: #666;
    font-size: 0.9rem;
}

footer p {
    max-width: 1000px;
    margin: 5px auto;
}

@media (max-width: 700px) {

    nav {
        align-items: flex-start;
        flex-direction: column;
    }

    .menu a {
        margin-left: 0;
        margin-right: 18px;
    }

    main {
        padding-top: 40px;
    }

    .hero {
        padding-top: 10px;
    }
}