:root {
    --bg: #0f172a;      /* deep slate */
    --text: #e5e7eb;    /* soft white */
    --accent: #38bdf8;  /* subtle modern blue */
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    height: 100%;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

main {
    height: 100%;
    display: grid;
    place-items: center;
}

h1 {
    margin: 0;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--accent);
}