/* ═══════════════════════════════════════════════════════════════
   OVERLAYS - Background Overlays, Scanlines, Vignette, Grid
   (from knexcoin.html)
   ═══════════════════════════════════════════════════════════════ */

/* THREE.JS CANVAS */
#webgl {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* SCANLINES with CRT FLICKER */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
    background: repeating-linear-gradient(
        0deg,
        transparent 0px,
        transparent 2px,
        rgba(0, 255, 0, 0.02) 2px,
        rgba(0, 255, 0, 0.02) 4px
    );
}

.overlay::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 255, 0, 0.01);
    animation: flicker 0.15s infinite;
    pointer-events: none;
}

@keyframes flicker {
    0%, 100% { opacity: 0.97; }
    50% { opacity: 1; }
}

/* SCANLINE EFFECT (index.html style) */
.scanlines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.1) 2px,
        rgba(0,0,0,0.1) 4px
    );
    z-index: 2;
    pointer-events: none;
    opacity: 0.3;
}

/* VIGNETTE */
.vignette {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 2;
    background: radial-gradient(ellipse at center, transparent 0%, transparent 40%, rgba(0,0,0,0.85) 100%);
}

/* GRID OVERLAY */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(90deg, rgba(0,255,0,0.03) 1px, transparent 1px),
        linear-gradient(rgba(0,255,0,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 1;
    pointer-events: none;
    opacity: 0.03;
}

/* Alternative grid using CSS vars (knexcoin.html style) */
.grid-overlay--var {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.03;
    background-image:
        linear-gradient(var(--neon) 1px, transparent 1px),
        linear-gradient(90deg, var(--neon) 1px, transparent 1px);
    background-size: 50px 50px;
}