/* Storm Glow — heavy ambient storm sky with flash spikes */
@keyframes stormGlowBase {
    0%, 100% { opacity: 0.35; }
    50% { opacity: 0.55; }
}
@keyframes stormGlowSpike {
    0%, 75%, 82%, 100% { opacity: 0; }
    77%, 80% { opacity: 0.9; }
}
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 90% 60% at 50% 0%, color-mix(in srgb, var(--anim-c-purple) 40%, transparent), transparent 60%),
        radial-gradient(ellipse 70% 50% at 20% 30%, color-mix(in srgb, var(--anim-c-blue) 30%, transparent), transparent 55%),
        linear-gradient(180deg, color-mix(in srgb, var(--anim-c-info) 12%, transparent), transparent 50%);
    animation: stormGlowBase 10s ease-in-out infinite;
    pointer-events: none; z-index: -1; filter: blur(40px);
}
body::after {
    content: '';
    position: fixed;
    top: 0; left: 10%; width: 80%; height: 50%;
    background: radial-gradient(ellipse 50% 40% at 50% 20%, color-mix(in srgb, var(--anim-c-info) 70%, transparent), transparent 70%);
    animation: stormGlowSpike 5s ease-in-out infinite;
    pointer-events: none; z-index: -1; filter: blur(20px);
}