:root {
    --bg: #e8e4dd;
    --text: #151515;
    --muted: #5f5a52;
    --line: #c9c2b8;
    --line-strong: #b8b1a7;
    --font-sans: "IBM Plex Sans", sans-serif;
    --font-mono: "IBM Plex Mono", monospace;
}

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

::selection {
    background: var(--text);
    color: var(--bg);
}

html,
body {
    min-height: 100%;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
}

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

a {
    color: inherit;
}

.page {
    min-height: 100vh;
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px;
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 0;
}

.site-header,
.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
}

.brand-mark {
    width: 38px;
    height: 38px;
    object-fit: contain;
    filter: contrast(1.1) brightness(0.14);
}

.site-nav,
.site-footer,
.card-label {
    font-family: var(--font-mono);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.site-nav a {
    color: var(--muted);
    text-decoration: none;
}

.site-nav a.is-active,
.site-nav a:hover {
    color: var(--text);
}

.site-header {
    margin-bottom: 48px;
}

.hero {
    align-self: center;
    margin-bottom: 15vh;
    padding: 40px 0 72px;
    border-top: 1px solid var(--line);
    max-width: 760px;
}

.hero-page {
    align-self: start;
    padding-bottom: 48px;
    border-top: none;
}

.hero h1 {
    padding-top: 0;
    margin-top: 0;
    font-size: clamp(2.8rem, 8vw, 5.8rem);
    font-weight: 500;
    letter-spacing: -0.05em;
    line-height: 0.92;
    max-width: 16ch;
}

.hero-page h1 {
    max-width: none;
    font-size: clamp(2.4rem, 6vw, 4.2rem);
}

.lead {
    margin-top: 28px;
    max-width: 34rem;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.55;
}

.content-grid {
    display: grid;
    gap: 24px;
    margin-top: 48px;
}

.info-card {
    max-width: 36rem;
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
}

.card-label {
    color: var(--muted);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.card-copy {
    margin-top: 10px;
    color: var(--text);
    line-height: 1.6;
}

.contact-form {
    margin-top: 36px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.form-field {
    display: grid;
    gap: 8px;
    margin-top: 16px;
}

.field-label {
    font-family: var(--font-mono);
    color: var(--muted);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.form-input {
    width: 100%;
    border: 1px solid var(--line-strong);
    border-radius: 0;
    background: transparent;
    color: var(--text);
    font: inherit;
    padding: 12px 14px;
}

.form-input:focus {
    outline: none;
    border-color: var(--text);
}

.form-textarea {
    resize: vertical;
    min-height: 180px;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-top: 18px;
}

.form-status {
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.4;
}

.button-link {
    display: inline-flex;
    margin-top: 18px;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border: 1px solid var(--line-strong);
    background: transparent;
    color: var(--text);
    cursor: pointer;
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.button-link:hover {
    background: rgba(21, 21, 21, 0.04);
}

/* Challenge */

.challenge-page {
    border-top: none;
}

.challenge-page h1 {
    margin-bottom: 80px;
}

.challenge-list {
    display: grid;
    gap: 64px;
}

.challenge-item {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: 0 12px;
}

.challenge-number {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--line-strong);
    letter-spacing: 0.08em;
    padding-top: 4px;
}

.challenge-item p {
    color: var(--muted);
    line-height: 1.6;
    max-width: 38rem;
}

.challenge-page .contact-form {
    margin-top: 80px;
}

.challenge-submit {
    font-size: 1.2rem;
    min-width: 42px;
    margin-top: 8px;
}

.site-footer {
    padding-top: 24px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

@media (max-width: 720px) {
    .page {
        padding: 22px 20px;
    }

    .site-footer {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-header {
        margin-bottom: 36px;
    }

    .hero {
        padding: 32px 0 56px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .lead,
    .card-copy {
        font-size: 1rem;
    }

    .job-header {
        grid-template-columns: 1fr auto;
        gap: 12px;
    }

    .job-location {
        grid-column: 1;
        grid-row: 2;
    }

    .job-toggle {
        grid-column: 2;
        grid-row: 1 / 3;
        align-self: center;
    }
}