* {
    box-sizing: border-box;
}

body {
    color: #333;
    background: white;
    font-family: "PT Sans", Arial, sans-serif;
}

a {
    color: inherit;
    text-decoration: none;
}

.menu {
    height: 54px;
    padding: 0 20px 0 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #eee;
    box-shadow: 0 1px 3px #eee;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: black;
    font-family: "PT Sans Caption", Arial, sans-serif;
    font-size: 22px;
}

.about-link {
    color: #999;
    font-size: 16px;
}

.sections {
    overflow: hidden;
}

.section {
    position: relative;
    width: 1204px;
    height: 800px;
    margin: 0 auto;
}

.text {
    width: 600px;
    padding-top: 127px;
}

h1, h2 {
    font-family: "PT Sans Caption", Arial, sans-serif;
    font-size: 36px;
    font-weight: 400;
    line-height: 46px;
}

p {
    margin-top: 22px;
    font-size: 26px;
    line-height: 38px;
}

.image {
    position: absolute;
    display: block;
    height: auto;
}

.first .image {
    top: 82px;
    left: 641px;
    width: 1106px;
}

.second .text {
    margin-left: 642px;
    padding-top: 119px;
}

.second p {
    margin-top: 23px;
}

.second .image {
    top: 65px;
    left: -42px;
    width: 646px;
}

.third .text {
    padding-top: 129px;
}

.third .image {
    top: 140px;
    left: 640px;
    width: 1295px;
    box-shadow: 0 0 4px #ddd;
}

.learning {
    height: 666px;
    padding: 129px 20px 0;
    border-top: 1px solid #ddd;
    text-align: center;
}

.learning p {
    margin-top: 23px;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 82px;
}

.button {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 52px;
    border-radius: 5px;
    font-family: "PT Sans Caption", Arial, sans-serif;
    font-size: 16px;
}

.source {
    width: 266px;
    border: 1px solid #ccc;
    color: #777;
}

.course {
    width: 300px;
    color: white;
    background: black;
}

a:focus-visible {
    outline: 2px solid #444;
    outline-offset: 4px;
}

@media (max-width: 1250px) {
    .section {
        width: 90%;
        height: auto;
        padding: 70px 0;
        display: flex;
        flex-direction: column;
        gap: 40px;
    }

    .section .text {
        width: 100%;
        margin-left: 0;
        padding-top: 0;
    }

    .section .image {
        position: static;
        width: 100%;
        max-width: 800px;
        margin: 0 auto;
    }

    .second .image {
        max-width: 650px;
    }

    br {
        display: none;
    }

    .learning {
        height: auto;
        padding: 70px 5% 100px;
    }
}

@media (max-width: 600px) {
    h1, h2 {
        font-size: 28px;
        line-height: 36px;
    }

    p {
        font-size: 20px;
        line-height: 30px;
    }

    .section {
        padding: 45px 0;
    }

    .buttons {
        flex-direction: column;
        align-items: center;
        margin-top: 40px;
    }

    .button {
        width: 100%;
        max-width: 300px;
    }
}