/*
 * Background Grid Network + Floating Particles
 * Variant A - Isolated and reusable
 * 
 * Usage:
 * 1. Include this CSS file in your HTML
 * 2. Add the HTML structure (see below)
 * 3. Include the JavaScript file
 * 
 * HTML Structure:
 * <div class="bg-grid-network">
 *     <canvas class="bg-grid-network-canvas" id="bgGridNetworkCanvas"></canvas>
 *     <div class="bg-grid-network-particles" id="bgGridNetworkParticles"></div>
 * </div>
 */

/* ==================== Background Container ==================== */

.bg-grid-network {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
    pointer-events: none;
}

/* ==================== Canvas for Grid Network ==================== */

.bg-grid-network-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* ==================== Particles Container ==================== */

.bg-grid-network-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* ==================== Individual Particle ==================== */

.bg-grid-network-particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0;
    animation: bgGridNetworkFloatUp linear infinite;
}

@keyframes bgGridNetworkFloatUp {
    0% {
        transform: translateY(0) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) scale(1);
        opacity: 0;
    }
}

/* ==================== Responsive Adjustments ==================== */

/* Tablet and below - reduce particle count via JavaScript */
@media (max-width: 991px) {
    .bg-grid-network-canvas {
        opacity: 0.8;
    }
}

/* Mobile - further reduce effects */
@media (max-width: 767px) {
    .bg-grid-network-canvas {
        opacity: 0.6;
    }
    
    .bg-grid-network-particle {
        animation-duration: 12s !important;
    }
}

/* Small mobile - minimal effects */
@media (max-width: 576px) {
    .bg-grid-network-canvas {
        opacity: 0.5;
    }
}

/* ==================== Performance Optimizations ==================== */

.bg-grid-network,
.bg-grid-network-canvas,
.bg-grid-network-particles,
.bg-grid-network-particle {
    will-change: transform, opacity;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* ==================== Accessibility ==================== */

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    .bg-grid-network-particle {
        animation: none !important;
    }
    
    .bg-grid-network-canvas {
        opacity: 0.3;
    }
}

/* ==================== Print Styles ==================== */

@media print {
    .bg-grid-network {
        display: none !important;
    }
}