@import url('https://fonts.googleapis.com/css2?family=Space+Mono&display=swap');

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    overflow: hidden;
    cursor: none;
    font-family: 'Space Mono', monospace;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 100vw;
    height: 100vh;
    z-index: 10;
    position: relative;
}

.cell {
    border: 1px solid transparent;
    transition: border-color 0.1s;
    pointer-events: auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.text-cell {
    color: #fff;
    font-size: 3rem;
    opacity: 0; /* hidden until glow reaches it */
    transition: opacity 0.1s;
    letter-spacing: 10px;
}

.cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    /* Subtle grey radial glow that will reveal the transparent borders */
    background: radial-gradient(circle at center, rgba(100, 100, 100, 0.4) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1;
    mix-blend-mode: screen;
}

/* We reveal things by letting the glow shine "behind" them, but since border is transparent, it won't work.
   Instead, we apply border explicitly on JS proximity, or just use mix-blend-mode to let glow act as border?
   Actually, if the cell border is rgba(255,255,255,0.1), it will only be visible when illuminated or stark.
   Wait, if bg is black, border is #222, it's visible. Vantablack means NO visibility.
   Let's do this: glow is the only light source.
*/