* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #171717;
    background: #ffffff;
    line-height: 1.6;
}

header {
    height: 76px;
    padding: 0 6vw;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #e8e8e8;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

header a {
    color: #171717;
    text-decoration: none;
    font-size: 15px;
}

main {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 6vw;
}

.hero {
    max-width: 850px;
    padding: 110px 0 120px;
}

.eyebrow {
    margin: 0 0 20px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.14em;
    color: #5d6b64;
}

h1 {
    max-width: 800px;
    margin: 0 0 28px;
    font-size: clamp(44px, 6vw, 76px);
    line-height: 1.03;
    letter-spacing: -0.04em;
    font-weight: 600;
}

.intro {
    max-width: 680px;
    margin: 0 0 38px;
    font-size: 21px;
    line-height: 1.55;
    color: #555;
}

.button {
    display: inline-block;
    padding: 14px 22px;
    background: #171717;
    color: white;
    text-decoration: none;
    font-size: 15px;
    border-radius: 3px;
}

.section {
    padding: 90px 0;
    border-top: 1px solid #e5e5e5;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 10vw;
}

.section-heading h2,
.book h2 {
    margin: 0;
    font-size: 42px;
    line-height: 1.1;
    letter-spacing: -0.03em;
    font-weight: 600;
}

.text {
    max-width: 600px;
    font-size: 18px;
    color: #555;
}

.text p {
    margin-top: 0;
    margin-bottom: 24px;
}

.three-column {
    padding: 20px 0 110px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.three-column div {
    border-top: 2px solid #171717;
    padding-top: 18px;
}

.three-column span {
    font-size: 12px;
    font-weight: 700;
    color: #777;
}

h3 {
    margin: 15px 0 10px;
    font-size: 24px;
    font-weight: 600;
}

.three-column p {
    margin: 0;
    color: #666;
}

.book {
    padding: 90px 0 110px;
    border-top: 1px solid #e5e5e5;
    max-width: 700px;
}

.book p:not(.eyebrow) {
    margin: 24px 0 30px;
    font-size: 18px;
    color: #555;
}

footer {
    padding: 30px 6vw;
    border-top: 1px solid #e5e5e5;
    display: flex;
    justify-content: space-between;
    color: #777;
    font-size: 13px;
}

footer a {
    margin-left: 20px;
    color: #777;
    text-decoration: none;
}

@media (max-width: 700px) {

    header {
        padding: 0 5vw;
    }

    main {
        padding: 0 5vw;
    }

    .hero {
        padding: 75px 0 85px;
    }

    h1 {
        font-size: 48px;
    }

    .intro {
        font-size: 18px;
    }

    .section {
        display: block;
        padding: 70px 0;
    }

    .section-heading {
        margin-bottom: 35px;
    }

    .section-heading h2,
    .book h2 {
        font-size: 34px;
    }

    .three-column {
        display: block;
        padding: 10px 0 80px;
    }

    .three-column div {
        margin-bottom: 45px;
    }

    footer {
        display: block;
        padding: 25px 5vw;
    }

    footer div:last-child {
        margin-top: 12px;
    }

    footer a {
        margin-left: 0;
        margin-right: 20px;
    }
}