```css
/* =========================================
   SPRUCE.NET
   AI for the Rest of Us
   ========================================= */


/* ---------- Basic Reset ---------- */

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
    color: #26352c;
    background: #f7f6f1;
}

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


/* ---------- Layout ---------- */

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.narrow {
    max-width: 760px;
}


/* ---------- Header ---------- */

.site-header {
    background: #f7f6f1;
    border-bottom: 1px solid #d9ddd7;
}

.header-inner {
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 27px;
    font-weight: bold;
    letter-spacing: -1px;
    color: #26352c;
}

.logo span {
    font-weight: normal;
    color: #70816f;
}

nav {
    display: flex;
    gap: 28px;
}

nav a {
    font-size: 14px;
    color: #526056;
}

nav a:hover {
    color: #26352c;
}


/* ---------- Typography ---------- */

.eyebrow {
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 2px;
    color: #71816f;
    margin-bottom: 18px;
}

h1 {
    font-size: clamp(52px, 8vw, 92px);
    line-height: 0.98;
    letter-spacing: -4px;
    margin-bottom: 35px;
    color: #26352c;
}

h2 {
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 25px;
}

h3 {
    font-size: 24px;
    line-height: 1.25;
    margin-bottom: 15px;
}


/* ---------- Hero ---------- */

.hero {
    min-height: 650px;
    display: flex;
    align-items: center;
    background: #e5eadf;
}

.hero-content {
    padding-top: 40px;
    padding-bottom: 40px;
}

.hero-text {
    max-width: 620px;
    font-size: 21px;
    line-height: 1.55;
    margin-bottom: 12px;
    color: #4c5b51;
}


/* ---------- Buttons ---------- */

.button {
    display: inline-block;
    margin-top: 25px;
    padding: 14px 24px;
    background: #26352c;
    color: white;
    border-radius: 4px;
    font-weight: bold;
    font-size: 15px;
}

.button:hover {
    opacity: 0.85;
}

.button-dark {
    background: #26352c;
}


/* ---------- Intro ---------- */

.intro {
    padding: 110px 0;
    background: #ffffff;
}

.intro p {
    font-size: 19px;
    margin-bottom: 18px;
    color: #536057;
}

.intro p:first-of-type {
    font-size: 30px;
    color: #26352c;
    font-weight: bold;
}


/* ---------- Cards ---------- */

.cards-section {
    padding: 110px 0;
}

.section-intro {
    max-width: 650px;
    font-size: 19px;
    color: #59655d;
    margin-bottom: 45px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.card {
    background: white;
    padding: 35px;
    border: 1px solid #dde1da;
    min-height: 330px;
}

.card-number {
    font-size: 13px;
    font-weight: bold;
    color: #7b8979;
    letter-spacing: 1px;
    margin-bottom: 35px;
}

.card p {
    color: #5c675f;
}

.card .example {
    margin-top: 25px;
    padding-top: 18px;
    border-top: 1px solid #e2e4df;
    font-size: 14px;
    font-style: italic;
    color: #6d786f;
}


/* ---------- Everyday AI ---------- */

.feature-section {
    padding: 110px 0;
    background: #26352c;
    color: white;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.feature-section .eyebrow {
    color: #aab7a7;
}

.feature-section h2 {
    color: white;
}

.feature-section p {
    font-size: 18px;
    color: #d2d9d1;
    margin-bottom: 20px;
}

.text-link {
    display: inline-block;
    margin-top: 15px;
    font-weight: bold;
    border-bottom: 1px solid #9eaa9c;
    padding-bottom: 4px;
}


/* ---------- Experiments ---------- */

.experiments {
    padding: 110px 0;
    background: #e9ede5;
}

.experiment-box {
    margin-top: 45px;
    padding: 45px;
    background: white;
    border: 1px solid #d5dbd2;
}

.experiment-label {
    display: block;
    font-size: 11px;
    font-weight: bold;
    letter-spacing: 2px;
    color: #788775;
    margin-bottom: 20px;
}

.experiment-box p {
    color: #5b665e;
}


/* ---------- About ---------- */

.about {
    padding: 110px 0;
    background: white;
}

.about p {
    font-size: 19px;
    color: #59655d;
    margin-bottom: 20px;
}


/* ---------- Footer ---------- */

footer {
    background: #1d2922;
    color: white;
    padding: 50px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    gap: 30px;
}

.footer-inner .logo {
    color: white;
}

.footer-inner .logo span {
    color: #a5b1a2;
}

.footer-inner p {
    color: #aeb8ae;
    font-size: 14px;
}

.footer-inner .copyright {
    margin-left: auto;
}


/* ---------- Mobile ---------- */

@media (max-width: 750px) {

    .header-inner {
        flex-direction: column;
        padding: 20px 0;
        gap: 15px;
    }

    nav {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav a {
        font-size: 13px;
    }

    .hero {
        min-height: 560px;
    }

    h1 {
        letter-spacing: -2px;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .footer-inner .copyright {
        margin-left: 0;
    }

}
```