:root {
    color-scheme: light dark;
    --background: #f4f6fa;
    --surface: #ffffff;
    --text: #172033;
    --muted: #5b6475;
    --primary: #2f4c91;
    --primary-contrast: #ffffff;
    --border: #dce1ea;
    --notice: #fff5d8;
    --notice-border: #e2b84b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.65;
}

a {
    color: var(--primary);
}

a:focus-visible {
    outline: 3px solid #efbd3f;
    outline-offset: 3px;
}

.site-header,
main,
footer {
    width: min(100% - 32px, 860px);
    margin-inline: auto;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-block: 22px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 750;
    text-decoration: none;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--primary);
    color: var(--primary-contrast);
    font-size: 13px;
    letter-spacing: .04em;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

nav a {
    font-weight: 650;
    text-decoration: none;
}

article {
    padding: clamp(24px, 6vw, 58px);
    border: 1px solid var(--border);
    border-radius: 22px;
    background: var(--surface);
    box-shadow: 0 18px 60px rgb(23 32 51 / 8%);
}

h1, h2, h3 {
    line-height: 1.25;
}

h1 {
    margin: 0;
    font-size: clamp(2.1rem, 7vw, 3.5rem);
    letter-spacing: -.035em;
}

h2 {
    margin-top: 2.2em;
    font-size: 1.45rem;
}

h3 {
    margin-top: 1.5em;
    font-size: 1.08rem;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--primary);
    font-size: .82rem;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.lead {
    max-width: 680px;
    color: var(--muted);
    font-size: 1.15rem;
}

.placeholder-notice {
    margin: 28px 0;
    padding: 18px 20px;
    border: 1px solid var(--notice-border);
    border-left-width: 5px;
    border-radius: 12px;
    background: var(--notice);
    color: #332707;
}

.contact-card {
    padding: 2px 22px 22px;
    border: 1px solid var(--border);
    border-radius: 14px;
}

.button {
    display: inline-block;
    padding: 11px 16px;
    border-radius: 10px;
    background: var(--primary);
    color: var(--primary-contrast);
    font-weight: 700;
    text-decoration: none;
}

footer {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding-block: 28px 40px;
    color: var(--muted);
    font-size: .9rem;
}

@media (max-width: 680px) {
    .site-header, footer {
        align-items: flex-start;
        flex-direction: column;
    }

    article {
        border-radius: 16px;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #071423;
        --surface: #0d1d30;
        --text: #edf3fc;
        --muted: #b6c2d2;
        --primary: #9db7ff;
        --primary-contrast: #071423;
        --border: #263a51;
        --notice: #332b15;
        --notice-border: #c29b35;
    }

    .placeholder-notice {
        color: #fff2c7;
    }
}