/* =========================================
   CLEARTH — METHANE MITIGATION
   Minimalist environmental/scientific design
   ========================================= */


/* ---------- Variables ---------- */

:root {
    --black: #151815;
    --dark: #202821;

    --green: #52695a;
    --green-light: #718878;

    --cream: #f5f5ef;
    --white: #ffffff;

    --line: #d9ddd6;

    --text: #292d2a;
    --muted: #69706b;

    --max-width: 1200px;
    --narrow-width: 820px;
}


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

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;

    background: var(--white);
    color: var(--text);

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Helvetica Neue",
        Helvetica,
        Arial,
        sans-serif;

    font-size: 17px;
    line-height: 1.7;

    -webkit-font-smoothing: antialiased;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

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


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

h1,
h2,
p {
    margin-top: 0;
}

h1,
h2 {
    font-weight: 400;
    letter-spacing: -0.025em;
}

h1 {
    max-width: 850px;

    font-size: clamp(3rem, 6vw, 6rem);
    line-height: 0.98;
}

h2 {
    font-size: clamp(2.3rem, 4vw, 4.2rem);
    line-height: 1.05;
}

p {
    max-width: 700px;
}

strong {
    font-weight: 600;
}


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

.container {
    width: min(
        calc(100% - 64px),
        var(--max-width)
    );

    margin-left: auto;
    margin-right: auto;
}

.narrow {
    max-width: var(--narrow-width);
}

.section {
    padding: 140px 0;
}

.section-light {
    background: var(--cream);
}


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

.site-header {
    position: absolute;

    top: 0;
    left: 0;

    width: 100%;

    z-index: 10;

    color: var(--black);
}

.nav-container {
    display: flex;

    align-items: center;
    justify-content: space-between;

    padding-top: 28px;
}


/* ---------- Logo ---------- */

.logo {
    display: block;

    width: 170px;

    line-height: 0;
}

.logo img {
    display: block;

    width: 100%;
    height: auto;
}


/* ---------- Navigation ---------- */

.navigation {
    display: flex;

    align-items: center;

    gap: 30px;

    font-size: 0.7rem;
    font-weight: 600;

    letter-spacing: 0.1em;

    text-transform: uppercase;
}

.navigation a {
    transition:
        color 0.2s ease;
}

.navigation a:hover {
    color: var(--green);
}


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

.hero {
    min-height: 100vh;

    display: flex;
    align-items: center;

    padding: 140px 0 100px;

    background: var(--cream);
}

.hero-grid {
    display: grid;

    grid-template-columns:
        minmax(0, 1.05fr)
        minmax(300px, 0.95fr);

    gap: 90px;

    align-items: center;
}

.hero-content h1 {
    margin-bottom: 38px;
}

.hero-text {
    max-width: 600px;

    margin-bottom: 40px;

    color: var(--muted);

    font-size: 1.15rem;
}

.hero-image {
    overflow: hidden;

    background: #dfe4de;

    aspect-ratio: 4 / 5;
}

.hero-image img {
    width: 100%;
    height: 100%;

    object-fit: cover;
}


/* ---------- Eyebrow Text ---------- */

.eyebrow {
    margin-bottom: 28px;

    color: var(--green);

    font-size: 0.72rem;
    font-weight: 600;

    letter-spacing: 0.16em;
    line-height: 1.4;

    text-transform: uppercase;
}


/* ---------- Text Links ---------- */

.text-link {
    display: inline-flex;

    align-items: center;

    gap: 14px;

    border-bottom: 1px solid var(--black);

    padding-bottom: 5px;

    font-size: 0.75rem;
    font-weight: 600;

    letter-spacing: 0.12em;

    text-transform: uppercase;

    transition:
        color 0.2s ease,
        border-color 0.2s ease;
}

.text-link:hover {
    color: var(--green);

    border-color: var(--green);
}

.text-link span {
    font-size: 1rem;
}


/* ---------- Large Text ---------- */

.section-light .large-text,
#work .large-text {
    margin-bottom: 32px;

    font-size: 1.25rem;
    line-height: 1.7;
}

.feedback {
    color: var(--green);
    font-weight: 500;
}


/* ---------- Contact ---------- */

.contact-section {
    padding: 160px 0;

    background: var(--green);

    color: var(--white);
}

.contact-container {
    max-width: var(--narrow-width);
}

.contact-section .eyebrow {
    color: #b7c5b9;
}

.contact-section h2 {
    margin-bottom: 35px;

    font-size: clamp(3.5rem, 7vw, 7rem);
}

.contact-intro {
    max-width: 500px;

    margin-bottom: 45px;

    color: #d3dbd4;
}

.email-link {
    display: inline-block;

    border-bottom: 1px solid rgba(255, 255, 255, 0.6);

    padding-bottom: 5px;

    font-size: clamp(1.4rem, 3vw, 2.3rem);

    transition:
        color 0.2s ease,
        border-color 0.2s ease;
}

.email-link:hover {
    color: #d5e1d6;

    border-color: #d5e1d6;
}


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

.site-footer {
    padding: 30px 0;

    background: var(--black);

    color: #9da39e;

    font-size: 0.7rem;

    letter-spacing: 0.04em;
}

.footer-container {
    display: grid;

    grid-template-columns:
        1fr
        1fr
        1fr;

    align-items: center;
}

.footer-logo {
    font-weight: 700;
    letter-spacing: 0.18em;
}

.footer-container > div:nth-child(2) {
    text-align: center;
}

.footer-container > div:last-child {
    text-align: right;
}

.site-footer a:hover {
    color: var(--white);
}


/* =========================================
   Mobile
   ========================================= */

@media (max-width: 800px) {

    .container {
        width: min(
            calc(100% - 40px),
            var(--max-width)
        );
    }


    /* Header */

    .nav-container {
        padding-top: 22px;
    }

    .logo {
        width: 135px;
    }

    .navigation {
        gap: 16px;

        font-size: 0.58rem;
        letter-spacing: 0.08em;
    }


    /* Hero */

    .hero {
        padding-top: 130px;
        padding-bottom: 80px;
    }

    .hero-grid {
        grid-template-columns: 1fr;

        gap: 60px;
    }

    .hero-image {
        aspect-ratio: 16 / 10;
    }


    /* Sections */

    .section {
        padding: 90px 0;
    }


    /* Contact */

    .contact-section {
        padding: 100px 0;
    }


    /* Footer */

    .footer-container {
        grid-template-columns: 1fr;

        gap: 15px;
    }

    .footer-container > div:nth-child(2),
    .footer-container > div:last-child {
        text-align: left;
    }
}


/* =========================================
   Very Small Screens
   ========================================= */

@media (max-width: 500px) {

    .container {
        width: calc(100% - 32px);
    }

    .logo {
        width: 120px;
    }

    .navigation {
        gap: 10px;

        font-size: 0.5rem;
    }

    h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2.4rem;
    }

    .hero {
        padding-top: 115px;
        padding-bottom: 70px;
    }

    .section {
        padding: 75px 0;
    }

    .section-light .large-text,
    #work .large-text {
        font-size: 1.12rem;
    }

    .contact-section {
        padding: 85px 0;
    }
}