*,
*::before,
*::after {
    box-sizing: border-box;
}

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

/* Base */
body {
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    color: #f5f7ff;
    background: radial-gradient(circle at top, #151b31 0, #050612 45%, #000000 100%);
    overflow: hidden;
}

/* Starfield canvas */
#starfield {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 1;
}

/* Centered content */
.center-card {
    position: relative;
    z-index: 2;
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-inline: 1.5rem;
    background: radial-gradient(circle at top, rgba(40, 60, 120, 0.3), transparent 60%);
}

.brand {
    font-family: "Orbitron", system-ui;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: clamp(1rem, 3vw, 1.3rem);
    opacity: 0.9;
}

.tagline {
    margin-top: 0.8rem;
    font-family: "Orbitron", system-ui;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    color: #6af8ff;
    text-shadow:
        0 0 14px rgba(84, 226, 255, 0.7),
        0 0 40px rgba(84, 226, 255, 0.45);
}

.sub {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.7;
    max-width: 20rem;
}