:root {
    color-scheme: light dark;
    --bg: #f6f7fb;
    --fg: #14161f;
    --muted: #5b6070;
    --brand: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d0f16;
        --fg: #eef0f6;
        --muted: #a2a7b6;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: 24px 16px;
    background: var(--bg);
    color: var(--fg);
    font: 17px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

main {
    max-width: 420px;
    text-align: center;
}

.mark {
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--brand);
}

h1 {
    font-size: 1.5rem;
    margin: 12px 0 8px;
}

p {
    color: var(--muted);
    margin: 0;
}