/**
 * Signal Background (Light) — fixed full-page layer styles.
 * Canvas (z 0) + white-edge vignette (z 1) sit behind all page content.
 * Background layer only — page sections keep their own backgrounds and
 * reveal the field wherever they are transparent.
 */

.np-sig-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    display: block;
    pointer-events: none;
}

.np-sig-vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
    background: radial-gradient(ellipse 70% 60% at 50% 45%,
        transparent 0%,
        rgba(249, 250, 251, 0.2) 82%,
        rgba(249, 250, 251, 0.55) 100%);
}

/* Page content paints above the field */
main#main {
    position: relative;
    z-index: 2;
}