/* Background and texture styles (moved from style.css) */

/* Фоновый градиент страницы */
.background-overlay {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
    /* layered, animated gradient for depth */
    background: linear-gradient(120deg, rgba(0,188,212,0.06), rgba(255,64,129,0.04) 40%, rgba(10,10,20,0.06));
    background-size: 200% 200%;
    filter: blur(60px);
    opacity: 0.9;
    will-change: background-position, transform;
    animation: gradientShift 20s linear infinite;
}

/* subtle repeating pattern for texture */
.background-overlay::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 18px 18px;
    opacity: 0.5;
    mix-blend-mode: overlay;
    animation: patternMove 60s linear infinite;
    pointer-events: none;
}

/* soft color glows */
.background-overlay::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 10%, rgba(0,188,212,0.05), transparent 20%),
                radial-gradient(ellipse at 80% 90%, rgba(255,64,129,0.04), transparent 20%);
    opacity: 0.9;
    filter: blur(30px);
    transform: translateZ(0);
    pointer-events: none;
}

/* new subtle grain layer (separate so we can control intensity) */
.grain-overlay {
    position: fixed;
    inset: 0;
    z-index: -1; /* above gradient, below content */
    background-image:
        radial-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.01) 0.5px, transparent 0.5px);
    background-size: 6px 6px, 3px 100%;
    opacity: 0.32; /* reduce intensity to avoid darkening words */
    pointer-events: none;
    mix-blend-mode: normal; /* keep it simple */
}

/* Word swarm: many tiny words drifting slowly */
.word-swarm {
    position: fixed;
    inset: 0;
    z-index: -1; /* between gradient and content */
    pointer-events: none;
    overflow: hidden;
}

.word-swarm .word {
    position: absolute;
    color: rgba(230,230,230,0.22); /* start slightly brighter gray */
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    font-size: 10px;
    letter-spacing: 0.02em;
    text-transform: lowercase;
    white-space: nowrap;
    /* Use custom properties for subtle scale and translation controlled by JS */
    --ws: 1;
    --tx: 0px;
    --ty: 0px;
    transform: translate(var(--tx), var(--ty)) scale(var(--ws));
    will-change: transform, opacity, filter;
    animation-name: floatWord, fadeWord;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    mix-blend-mode: normal; /* avoid interaction with grain overlay */
    text-shadow: 0 0 6px rgba(0,0,0,0.25);

    /* default appearance and transitions */
    pointer-events: none;
    transition: color 220ms ease, opacity 260ms ease, filter 260ms ease, transform 260ms cubic-bezier(.16,1,.3,1);
}

.word-swarm .word:hover,
.word-swarm .word:focus {
    color: rgba(255,255,255,0.44); /* even whiter on direct hover */
    transform: translateY(-6px) scale(1.08);
    opacity: 1;
}

@keyframes floatWord {
    0% { transform: translate(var(--tx,0), var(--ty,0)) scale(var(--ws,1)) translateY(0) translateX(0); }
    50% { transform: translate(var(--tx,0), var(--ty,0)) scale(var(--ws,1)) translateY(-12px) translateX(6px); }
    100% { transform: translate(var(--tx,0), var(--ty,0)) scale(var(--ws,1)) translateY(0) translateX(0); }
}

@keyframes fadeWord {
    0% { opacity: 0.20; }
    50% { opacity: 0.44; }
    100% { opacity: 0.20; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .word-swarm .word { animation: none !important; }
    .grain-overlay { opacity: 0.35 !important; }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes patternMove {
    from { transform: translateY(0); opacity:0.5; }
    to { transform: translateY(-30px); opacity:0.45; }
}

/* Mobile: reduce intensity to save resources */
@media (max-width: 600px) {
    .background-overlay { filter: blur(40px); opacity: 0.8; }
    .background-overlay::before { opacity: 0.35; }
    .grain-overlay { opacity: 0.25; }
}