:root {
    color-scheme: dark;
    font-family: Arial, Helvetica, sans-serif;
    background: #090d18;
    color: #ffffff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at top, #18294a 0%, #090d18 55%);
}

main {
    width: min(90%, 720px);
    padding: 48px 32px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    background: rgba(13, 20, 36, 0.88);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

h1 {
    margin: 0 0 16px;
    font-size: clamp(32px, 7vw, 56px);
}

p {
    margin: 0;
    color: #b8c3d9;
    font-size: 18px;
    line-height: 1.6;
}